22 guide tender specifications - ups manufacturers india

22G

UID

E TE

ND

ER

SPEC

IFIC

ATIO

NS

22-1

22-2

Scope:

This general specification lays down the functional requirements, performance characteristics, quality of

installation required of a ___KVA uninterruptable power system (UPS) with IGBT rectifier and inverter with

inbuilt isolation transformer and with ___mins backup time.

Description of the system

The UPS system shall consist of rectifier/charger, batteries, inverter, static bypass, manual bypass, protective

devices and accessories that automatically provides continuous supply of electric power to its load within the

tolerance as set out in this specifications sheet.

Project Requirement:

The proposed UPS configuration is ___nos of ___KVA operating in standalone configuration or parallel

redundant configuration with ___minutes backup time using sealed maintenance free VRLA battery on each

UPS.

Operation Modes

“Normal” Mode: This is the most frequent operating condition. The energy is drawn from the primary mains

power supply and is converted and used by the inverter to generate the output voltage to power the loads

connected. The inverter is constantly synchronised with the auxiliary mains to enable load transfer (due to an

overcurrent or inverter shutdown) without any break in the power supply to the load. The battery charger

supplies the energy required to maintain or recharge the battery.

Bypass Mode: In case of inverter failure, the load is automatically transferred onto the auxiliary mains without

any interruption in the power supply. This procedure may occur in the following situations:

• In the event of a temporary overload, the inverter continues to power the load. If the condition persists,

output is switched onto the auxiliary mains via the automatic bypass.

• Normal operation, which is from inverter, returns automatically a few seconds after the overload

disappears.

• When the voltage generated by the inverter goes out of tolerances due to a major overload or a fault on

the inverter

• When the internal temperature exceeds the maximum value allowed.

GUIDE SPECIFICATIONSTRANSFORMER BASED

© Copyrights Reserved

22-3

Battery mode: In the event of a mains failure (micro interruptions or extended black-outs), UPS continues to

power the load using the energy stored in the battery. The expert battery system keeps the user constantly

informed on the battery status and on the remaining backup time adapted permanently according to the

battery capacity and the load rate.

Mechanical Characteristics

The UPS and batteries shall be installed in cabinet(s) with an IP-20 degree of protection

(standard IEC 60529)

The system shall be of modular construction and access to the subassemblies making up the system shall

be exclusively through the front.

System cooling shall be by forced air ventilation and be equipped with a redundant ventilation



• The UPS system shall be of online, double conversion type conforming to IEC 62040-3

• The general & safety requirements of the UPS system shall be complied with IEC 62040-1

• The system shall be classified as VFI-SS-III as per IEC 62040 such that UPS output is independent of

supply mains voltage and frequency variations

• The UPS system shall be designed to interface & operative with generator or EB mains to maintain an

uninterrupted power to the loads

• The UPS System shall be constructed in heavy duty metal enclosures and designed for floor mounting

• All materials and parts comprising the UPS shall be new, of current manufacture of high grade and free

from all imperfections and shall not have been in prior service, expect as required during factory testing.

• The UPS modules shall not incur permanent damages to itself or loads under all predictable fault

conditions

• Static transfer switch shall be provided in the UPS. In the event of failure of UPS, the loads should be

supported by static bypass without interruption

Functional & Performance Requirement

The UPS, not including the battery, shall be capable of operating under the following environmental

conditions without loss of performance:

• Temperature range during continuous operation: 0°C to 40°C(without derating)

• Maximum relative humidity: 95%

• Maximum altitude without derating: 1000 m.

• Noise level: <75 dbA

Environment Conditions

22-4

• The inverter shall be a transistorized solid state type, IGBT, which is designed with SVM Modulation

Technology

• The battery shall be equipped with a self-test that can be run manually or automatically according to

user-set time intervals and with configurable discharge power.

• The UPS system should have an provision to perform equalisation charging automatically on a predefined

interval to maintain the healthiness of the battery

• The UPS system should be able to deliver 10% more power at 25 deg C

• The UPS shall have selfregulating and selfprotection against following conditions

• Overvoltage

• Powerline surges

• Under voltage and overcurrent induced by the mains

• Sudden changes in the output load and short circuits at the output

• Transient, surges, voltage spikes shall be suppressed and shall be removed from the

output of UPS

• The overall AC-AC efficiency of the UPS shall not be less than 94%. The efficiency shall be measured

under the following conditions

• The UPS System is operating at 50% load

• The battery is fully charged and floating on the system

• The input voltage is within the specifications

• The load power factor shall be 0.9 lagging

• The UPS system shall comply with IEC 62040-2 for electromagnetic compatibility requirements

• UPS shall be compatible to take nonlinear loads and capable to handle high crest load.

• UPS shall be provided with a harmonic of less than 5% and input PF of 0.99.

• The UPS shall be designed to work in following environmental conditions:

• Operating temperature 0-40 deg C, continuously

• Relative humidity 0-95%

• Storage temperature: - 25°C to 50°C

• Operating altitude 1000 m above MSL

• The battery charger of the UPS should be able to adapt the battery charging based on the

real time information of the status or condition of battery in terms of temprature, battery voltage,

charge status etc.

• UPS shall be designed for minimumover load of 150% for 1 mins and 125% for 10 mins

• The rectifier should meet with the following specification in addition to other requirements stated herein.

• Input RYB phase reversal protection and correction circuit to be provided as standard to avoid UPS

transferring to battery mode in case of phase sequence change at input. The UPS should continue to

work in mains mode. (If the input phase is interchanged, even then UPS has to work in double

conversion mode without changing to battery mode)



22-5

• The inverter shall be a transistorized solid state type, IGBT, which is designed with SVM Modulation

Technology

• The battery shall be equipped with a self-test that can be run manually or automatically according to

user-set time intervals and with configurable discharge power.

• The UPS system should have an provision to perform equalisation charging automatically on a predefined

interval to maintain the healthiness of the battery


• The UPS shall have selfregulating and selfprotection against following conditions

• Overvoltage


• Under voltage and overcurrent induced by the mains


• Transient, surges, voltage spikes shall be suppressed and shall be removed from the

output of UPS

• The overall AC-AC efficiency of the UPS shall not be less than 94%. The efficiency shall be measured

under the following conditions





• The UPS system shall comply with IEC 62040-2 for electromagnetic compatibility requirements

• UPS shall be compatible to take nonlinear loads and capable to handle high crest load.

• UPS shall be provided with a harmonic of less than 5% and input PF of 0.99.

• The UPS shall be designed to work in following environmental conditions:

• Operating temperature 0-40 deg C, continuously

• Relative humidity 0-95%

• Storage temperature: - 25°C to 50°C

• Operating altitude 1000 m above MSL

• The battery charger of the UPS should be able to adapt the battery charging based on the

real time information of the status or condition of battery in terms of temprature, battery voltage,

charge status etc.

• UPS shall be designed for minimumover load of 150% for 1 mins and 125% for 10 mins

• The rectifier should meet with the following specification in addition to other requirements stated herein.

• Input RYB phase reversal protection and correction circuit to be provided as standard to avoid UPS

transferring to battery mode in case of phase sequence change at input. The UPS should continue to

work in mains mode. (If the input phase is interchanged, even then UPS has to work in double

conversion mode without changing to battery mode)


Nominal voltage 415 V, 3 - phase

Voltage range ±15% (AC)

Nominal frequency 50 Hz

Frequency range ± 5% (± 2.5 Hz)

Input power factor 0.98 lagging or more at full load (pf improvement)

Input harmonic current THD <5% typical 100% load <8% maximum at 50% load

Cooling Forced cooling using

Progressive walk in Should be present

Phase Sequence Should have inbuilt phase sequence correction

• The battery may be taken out of service for maintenance, during period it shall be possible for the

inverter to continue operation by drawing power from the rectifier. Ripple content at the DC link

shall not exceed 2% even with battery disconnected

• The rectifiers / chargers shall be designed to completely charge the battery in a maximum time of 8 to

10 hours (Refer datasheet) after complete discharge. Facilities shall be provided to initiate battery

boost charge operation by Manual or automatic means.

• Boost and float charging shall be automatically controlled to recharge the battery to 100% capacity.

After battery is fully charged or after a pre-selected time (adjustable through 0 - 24 hours timer)

whichever is earlier – the unit shall revert to float charge mode automatically. Also charge voltage

compensation for the battery operating temperature shall be provided.

• The UPS should be capable of performing an automatic equalisation charging of the battery to

improve the performance of battery

• The rectifier should meet the following specifications in addition to other requirements stated herein.

• The battery shall be of sealed maintenance free battery and shall be designed to support a full load for

mins.An output power factor of 0.9 has to be considered for battery sizing with an ageing factor of

0.8 at an end cell voltage of 1.7V/cell

• A battery charging current of 10% of offered AH capacity has to be provided for battery charging.


22-6

Inverter technology

Voltage input

Nominal voltage output 415V,3 Phase,4 wire

Output power factor 0.9(min)

Inverter capacity KVA/KW

Voltage regulation

For 0 to 100% loading Less than ± 1%

Less than ± 1%

Environmental conditions given below Less than ± 1%

Transient voltage regulation

At 100% step load change Less than ± 5%

At loss of return of AC input Less than ± 5%

At load transfer from bypass to inverter Less than ± 5%

Time to recover from transient to normal voltage

<20 milliseconds

Wave form Pure Sinusoidal

Normal frequency 50 Hz

Frequency regulation for all conditions of

supplies, loads and temperature occurring

simultaneously or in any combination

(automatically controlled)

Synchronization limit for synchronization between inverter and standby AC source

49 Hz to 51 Hz

Field adjustment range for above 50±0.25 Hz to 50±1.5 Hz

Less than 2% THD fo linear load

Less than 2% THD for non - linear load

Duty Continuous

Cooling Forced cooling using fans

Total voltage harmonic distortion

The inverter should meet the following specifications in addition to other requirements

stated herein.


Short circuit capability on inverter (phase

to phase, phase to netural, phase to

ground & 3 Phase)

Should be min 2.5 times the rated

current for 100 ms

Inverter DC input voltage varies frommaximum to minium

Range as per manufacuture design,

maximum DC bus voltage during

charging the batteries.

Shall be a transistorized solid

state type

Yes

22-7

Control Annunciation and Indication Devices: The UPS system shall have LCD Display for

monitoring the parameters and status of alarm. The UPS shall be provided with a mimic diagram

on the front door of cubicle housing the system.

Indications The following shall be provided:

• Monitoring of AC input voltage

• Monitoring of DC bus voltage

• Monitoring of DC charging/discharging current from the battery.

• Monitoring of output line voltage

• Monitoring of output line current

• Monitoring of input and output frequency

• Monitoring of AC bypass input voltage

• Monitoring of output power

Indications: Each UPS module shall be equipped with a mimic to indicate power flow to the critical

load along with an indication of the availability of the rectifier/charger, battery, automatic bypass,

inverter, and load. The mimic shall provide a quick and easy indication of the load level

(displayed on LCD), including for overload conditions (displayed on LCD). This power flow is

also shown in the LCD menu.

The display unit shall display the following UPS operational status

• Normal operation, load power ___%

• Battery operation, time ___minutes.

• Bypass operation.

• Standby

• LED indications for load level battery autonomy

• Indication Lamp shall be provided for Red LEDs shall be provided for ON indication,

Green for OFF indication and Amber for fault indication, Main ON, Battery ON, Inverter ON, and

low battery


22-8

Annunciations :

Alarm annunciation shall be provided using either LED indicators or LCD display for depiction of fault

conditions in the UPS system along with audible alarm. The system shall have 'accept', 'reset' and 'test'

facility over separate push buttons. The annunciation system shall cover the faults described earlier for the

entire UPS system including in the following

• Overload

• DC overvoltage

• Emergency shutdown

• Rectifier fault

• Battery low condition

• Mains failure

• Cooling fan failure, where provided

• Fuse failure

• Static bypass ready/fault

• Static bypass inhibited

• Inverter fault

• Output voltage error

• UPS fail

• Short circuit

• Battery charging

System Earthing and Equipment Earthing

Two independent and distinct earth electrodes shall be provided for equipment earthing of UPS connections

comprising 50 x 6-mm GI strips/or as required/approved. Each of these earth electrodes shall

comprise a GI plate as per Code of Practice for Earthing IS 3043-1987 (latest version).

Testing and Commissioning

The UPS shall be thoroughly checked for correct operation and load tested in supplier works before

dispatch. All faults, control functions and site load conditions shall be simulated, checked and proved. The

equipment shall be dispatched after testing in presence of authorized representative of purchaser.

The UPS system should have intelligent test characteristic to perform a heat run test at full load and part

loads without any additional load bank.

The UPS should also have an inbuilt function to perform a discharge test of the battery without any need of

additional load bank.


22-9

1 RATING KVA UPS

No.of set

Reference no. Vendor to Specify

Make Vendor to Specify

Model Vendor to Specify

2 INPUT

2.1 Nominal voltage

2.2

2.3

2.4

3

Frequency

< 5% on full load

OUTPUT

3.1 Voltage Configuration

3.2 Voltage Harmonic

3.3 Over load

3.4 Load power factor

3.5 Waveform True sine wave

3.6 Load CF

3.7

Vendor to specify

3.8 Duty Continuous

3.9 Static voltage regulation plus or minus 1%

FICHTNER CONSULTING E NGINEERS



3.10

3.11 Efficiency >92%

3.12

RECTIFIER

4.1 Type IGBT


Datasheet

Description

Vendor to specifySl. No.

Three Phase : 415V, 3Phase+

Netural + Ground with +/-

15% tolerance

50 Hz(+/-3%)

Input Power Factor

Input harmonic Current

0.99

Three Phase : -415 V, # Phase

+Netural + Ground

<3% for linear & <5% for Non

linear Load.

< or =125% for 10 mins, <or

=150%for 60 sec

0.9 lag to unity within

KVA & KW rating

3:1

Dynamic response to 100% load Step

Max. Output current loading @ 0.9 PF Vector to specify( in AMP.)

Ripple voltage of battery Vendor to Specify

22-10

5.1

5

Type

CHARGER

For IGBT

5.2 Nominal voltage regulation +/-1%

5.3 Ripple (Without battery) < 1%

5.4 Charging method Constant Voltage Constant Current (CVCC)

5.5 Max. Charging Current Vendor to specify

5.6 Charger Protection

5.6.1 DC over current Required

5.6.2 DC over voltage Required

5.6.3 Input over voltage Required

5.6.4 Input under voltage Required

5.6.5 Battery charger rating Vendor to specify

5.6.5 Battery charging duration Vendor to specify

5.6.6 Phase Sequence Correction Required

5.6.7

6 BATTERY

6.1 Battery voltage 12 V

6.2

6.3 Battery capacity (in AH) Vendor to specify

6.4 Battery bus voltage - V DC Vendor to specify

6.5 Battery make

6.6 Battery Rack dimensions L x W X H (in mm )

6.7 Rack weight with battery (in Kgs) Vendor to specify

6.8 Battery circuit breaker Vendor to specify

6.9 0.9

6.10 Ageing factor 1.25

6.11 End cel voltage 1.7V


7 INVERTER IGBT based space vector

modulation with inbuilt

transformer INVERTER PROTECTION

7.1 Low battery voltage Required

7.2 Output short circuit Required

Power factor Considered ofbattery sizzing

Type

Automatic Equalisation charging ofBattery

Sealed Maintenance Free(SMF)

22-11


7.3 Output over curent Required

7.4 Output over voltage Required

7.5 Output under voltage Required

7.6 Thermal protection Required

8 BYPASS STATIC SWITCH SCR based, Bi directional ,

make before break type, fully

electronic.

8.1 Transfer (Inverter to bypass) In Sync.Mode – No break in transfer

8.2 Retransfer (Bypass to inverter)

9 MANUAL BYPASS FACILITY

9.1 Changeover from bypass to

manual bypass

Without break.

10 EFFICIENCY

SPECIFIC OVERLOAD TIME

ENVIRONMENTAL

10.1 Inverter Efficiency (DC to AC) Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

10.2

10.3

10.4

10.5

10.6

11

11.1

11.2

11.3

11.4

11.5

12

12.1

12.2

12.4 Humidity

12.5 Altitude

50 Deg C ambient designwithout derating

Upto 955 RH, Non-

condensing

13 PHYSICAL

13.1 Class IP 20

13.2 Forced Air

Enclosure Protection Grade

Cooling

In Asysnc.Mode- <5mSecIn Sync.Mode - No break inretransfer

(At full load & nominal inputVoltage)

Conv.Efficiency(AC to Dc)

Overall Efficiency(AC to AC)

At 50% load capacity


At 110% Load

At 125% Load

At 150%Load

At 200%Load

At 250%Load

Acoustic noise level <65db @ 1 Mtr.


Design temperature

13.3 Colour 13.4 Cable entry Bottom 13.5 Weight in Kg.

13.6

13.7

13.8

14

14.1

14.2

14.3

14.4

14.5

14.6

14.7

14.8

14.9

15

in

16

17

17.1

Type of I / P termination for UPS

ADDITIONAL FEATURES

Software for AC monitoring

14.10

14.11

14.12

14.13

14.14

17.2

17.3

17.4

17.5

17.6

17.7

17.8

18 OTHERS

18.1

22-12


Inbuilt output isolation

transformer for individual UPS

Vendor to specify

Vendor to specify

Vendor to specify

Vendor to specify

Dimensions (in mm)(W x D x H)

Thickness of enclosure

Bottom farme with sufficientload bearing capacity

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

Required

METERING & DISPLAY

LCD DISPLAY

Input voltage

Output voltage

Output current

Input current

Power factor

Power (in Kw)

Output power (in Kw)

Load in %

Fault type

Frequency output

Frequency (Input or bypass)

DC voltage

DC current

Comprehensive LED Mimicrequired with the single linepower flow diagram

Vendor to specify

Vendor to specify

MODBUS protocol require

999 event data logger with date & time

Transisent voltage surgeprotection at UPS input

Maintenance bypass switch

Inbuilt incoming and outgoingisolator

Cable from battery bank tobattery circuit breaker

battery bank isolator (MCCB)

Cable from battery bank tobattery circuit breaker

Testing of UPS & battery without Vendor scope, any additional loadbank at full load and part loads

Vendor scope

Vendor to specifythe rating and model

Vendor to specifyand the required cable shallbe in the scope of vector

Scope:

This general specification lays down the functional requirements, performance characteristics, quality of

installation required for uninterruptable power supply(UPS)

Description of the system

The UPS system shall consist of rectifier/charger, batteries, inverter, static bypass, manual bypass,

protective devices and accessories that automatically provides continuous supply of electric power to its

load within the tolerance as set out in this specifications.

Project Requirement:

The critical loads covering the process load IT equipment, desktops and essential services will be backed

by the proposed UPS.

The proposed UPS configuration is nos of KVA operating in standalone or parallel configuration with

X minutes backup time using sealed maintenance free VRLA battery on each UPS

Operation Modes

“Normal” Mode: This is the most frequent operating condition. The energy is drawn from the primary mains


connected. The inverter is constantly synchronised with the auxiliary mains to enable load transfer (due to

an overcurrent or inverter shutdown) without any break in the power supply to the load. The battery charger


Bypass Mode: In case of inverter failure, the load is automatically transferred onto the auxiliary mains

without any interruption in the power supply. This procedure may occur in the following situations:

• In the event of a temporary overload, the inverter continues to power the load. If the condition

persists, output is switched onto the auxiliary mains via the automatic bypass.

• Normal operation, which is from inverter, returns automatically a few seconds after the

overload disappears.

• when the voltage generated by the inverter goes out of tolerances due to a major overload

or a fault on the inverter

• when the internal temperature exceeds the maximum value allowed.

GUIDE SPECIFICATIONSTRANSFORMERLESSUPS

22-13


22-14

Battery Mode: In the event of a mains failure (microinterruptions or extended blackouts), UPS continues to

power the load using the energy stored in the battery. The Expert Battery System keeps the user constantly

informed on the battery status and on the remaining back-up time adapted permanently according to the



• The UPS and batteries shall be installed in cabinet(s) with an IP 20 degree of protection


• The system shall be of modular construction and access to the subassemblies making up the system

shall be exclusively through the front.

• System cooling shall be by forcedair ventilation and be equipped with a redundant ventilation




• Temperature range during continuous operation: 0°C to 40°C


• Mmaximum altitude without derating: 1000 m.



GUIDE SPECIFICATIONSTRANSFORMER LESSUPS

Battery Mode: In the event of a mains failure (microinterruptions or extended blackouts), UPS continues to

power the load using the energy stored in the battery. The Expert Battery System keeps the user constantly

informed on the battery status and on the remaining back-up time adapted permanently according to the



• The UPS and batteries shall be installed in cabinet(s) with an IP 20 degree of protection


• The system shall be of modular construction and access to the subassemblies making up the system

shall be exclusively through the front.

• System cooling shall be by forcedair ventilation and be equipped with a redundant ventilation




• Temperature range during continuous operation: 0°C to 40°C


• Mmaximum altitude without derating: 1000 m.


22-15


• The UPS System shall be of online, double conversion type conforming to IEC 62040-3

• The general & safety requirements of the UPS system shall be complied with IEC 62040-1

• The system shall be classified as VFI-SS-III as per IEC 62040 such that UPS output is

independent of supply mains voltage and frequency variations

• The UPS system shall be designed to interface & operative with generator or EB mains to

maintain an uninterrupted power to the loads

• The UPS System shall be constructed in heavy duty metal enclosures and designed for floor

mounting

• All materials and parts comprising the UPS shall be new, of current manufacture of high

grade and free from all imperfections and shall not have been in prior service, expect as required

during factory testing.

• The UPS modules shall not incur permanent damages to itself or loads under all predictable

fault conditions

• Static transfer switch shall be provided in the UPS.In the event of failure of UPS, the loads

should be supported by static bypass without interruption

• The Inverter shall be a transistorized solid state type, IGBT, which is designed with SVM

modulation technology

• The battery shall be equipped with a self-test that can be run manually or automatically

according to user-set time intervals and with configurable discharge power.

• The UPS system should have an provision to perform equalisation charging automatically

on a predefined interval to maintain the healthiness of the battery


• The UPS shall have self-regulating and self-protection against following conditions

Functional & Performance Requirement

• The overall AC-AC efficiency of the UPS shall not be less than 95%. The efficiency shall be

measured under the following conditions

• The UPS system is operating at 50% load





• Over voltage


• Undervolatge and overcurrent induced by the mains


• Transient surges,voltage spikes shall be suppressed and shall be removed from

the output of UPS

• The battery shall be of sealed maintenance free battery and shall be designed to support a full load for

X mins. An output power factor of 0.9 has to be considered for battery sizing with an ageing factor of

0.8 at an end cell voltage of 1.7V/cell

• A battery charging current of 10% of offered AH capacity has to be provided for battery charging.

• The battery may be taken out of service for maintenance, during which period it shall be possible for

the inverter to continue operation by drawing power from the rectifier. Ripple content at the DC link shall

not exceed 2% even with battery disconnected

• The rectifiers/chargers shall be designed to completely charge the battery in a maximum time of 8 to

10 hours (Refer datasheet) after complete discharge. Facilities shall be provided to initiate battery

boost charge operation by manual or automatic means.

• Boost and float charging shall be automatically controlled to recharge the battery to 100% capacity.

After battery is full charged or after a pre-selected time (adjustable through 0- 24 hours timer) whichever

is earlier, the unit shall revert to float charge mode automatically. Also charge voltage compensation for

the battery operating temperature shall be provided.

• The rectifier should meet the following specifications in addition to other requirements stated herein.

Nominal voltage

Voltage range +15% (AC)

Nominal frequency 50 Hz

Frequency range ± 5% (± 2.5 Hz)

Input power factor 0.98 lagging or more at full load (pf improvement)

Input harmonic current THD <5% typical at 100% load <8% maximum at 50% load

Cooling Forced cooling using fans.

Progressive walk in Should be present

Phase Sequence Should have inbuilt phase sequence correction

22-16



415 v, 3 - Phase

Inverter technology Shall be a transistorized solid state

type

Voltage input

Range as per manufacturer design,

maximum DC bus voltage during

charging the batteries.

Nominal voltage output 415V, 3 Phase, 4 wire

Output power factor 0.9(min)

Inverter capacity ___ KVA /___KW

Voltage regulation

For 0 to 100% loading Less than ± 1%

Inverter DC input voltage varies from

maximum to minimum Less than ± 1%

Environmental conditions given below Less than ± 1%

Transient voltage regulation

At 100% step load change Less than ± 5%

At loss of return of AC input Less than ± 5%

At load transfer from Bypass to Inverter Less than ± 5%

Time to recover from transient to normal

voltage <20 milliseconds

Waveform Pure Sinusoidal

Normal frequency 50 Hz

Frequency regulation for all conditions of

input supplies, loads and temperature

occurring simultaneously or in any

combination (automatically controlled)

Yes

Synchronization limit for synchronization

between inverter and standby AC source 49 Hz to 51 Hz

Field adjustment range for above 50±0.25 Hz to 50±1.5 Hz

Total voltage harmonic distortion Less than 2% THD for linear load

Less than 4% THD for non -linear load

Duty Continuous

Cooling Forced cooling using fans

Short circuit capability on inverter (phase

to phase, phase to neutral, phase to

ground & 3 Phases)

Should be min 2.5 times the rated

current for 100 ms

The inverter should meet the following specifications in addition to other requirements

stated herein.

22-17


Control Annunciation and Indication Devices: The UPS system shall have LCD Display for monitoring the

parameters and status of alarm. The UPS shall be provided with a mimic diagram on the front door of cubicle

housing the system.

Indications : The following shall be provided









Indications: Each UPS module shall be equipped with a mimic to indicate power flow to the critical load along

with an indication of the availability of the rectifier/charger, battery, automatic bypass, inverter and load. The

mimic shall provide a quick and easy indication of the load level (displayed on LCD), including for overload

conditions (displayed on LCD). This power flow is also shown in the LCD menu.


22-18

Annunciations :



facility over separate push buttons. The annunciation system shall cover the faults described earlier for the

entire UPS system including in the following

• Overload

• DC overvoltage


• Rectifier fault


• Mains failure


• Normal operation, load power ___%

• Battery operation, time ___minutes.

• Bypass operation.

• Standby


• Indication lamp shall be provided for Red LEDs shall be provided for ON indication,

Green for OFF indication and Amber for fault indication, Main ON, Battery ON, Inverter ON, and

low battery

22-19


• Fuse failure



• Inverter fault


• Ups fail

• Short Circuit

• Batterycharging

System Earthing and Equipment Earthing

Two independent and distinct earth electrodes shall be provided for equipment earthing of UPS

connections comprising 50x6-mm GI strips/ or as required/ approved. Each of these earth electrodes shall

comprise a GI plate as per Code of Practice for Earthing IS 3043-1987 (latest version)

Testing and Commissioning

The UPS shall be thoroughly checked for correct operation and load tested in supplier works before

dispatch. All faults, control functions and site load conditions shall be simulated, checked and proved. The

equipment shall be dispatched after testing in presence of authorized representative of purchaser.

The UPS system should have intelligent test characteristic to perform a heat run test at full load and part

loads without any additional load bank

The UPS should also have an inbuilt function to perform a discharge test of the battery without any need of

additional load bank.


SR.

NO. DESCRIPTION

Vendor to

specify

1 RATING KVA UPS

No. of set

Reference no. Vendor to specify

Make Vendor to specify

Model Vendor to specify

2 INPUT 2.1 Nominal voltage Three Phase : 415 V, 3Phase + Neutral +

Ground with +/ - 15% tolerance

2.2 Frequency 50 Hz( +/ -3%)

2.3 Input power factor 0.99 2.4 Input harmonic

current

< 5% on full load

3 OUTPUT

3.1 Voltage

Configuration Three Phase : -

415 V, 3Phase + Neutral + Ground

3.2 Voltage Harmonic <3% for linear & <5% for non linear load. 3.3 Over load < or =125% for 10 mins, <or =150% for 60

sec

3.4 Load Power Factor 0.9 lag to Unity within KVA & KW rating

3.5 Waveform True sinewave 3.6 Load CF 3 : 1

FICHTNER

CONSULTING E NGINEERS

FICHTNER


FICHTNER


FICHTNER


FICHTNER


FICHTNER


FICHTNER


FICHTNER


3.7 Dynamic response

to 100% load step

Vendor to specify

3.8 Duty Continious 3.9 Static voltage

Regulation

Plus or minus 1%

3.10 Max. output current

loading @ 0.9 PF

Vendor to specify( in Amp.)

3.11 Efficiency >92% 3.12 Ripple voltage of

Battery

Vendor to specify

4 RECTIFIER 4.1 Type IGBT

22-20


22-21

6.7 Rack weight with

battery(in Kgs)

Vendor to specify

6.8 Battery circuit

breaker

Vendor to specify

6.9 Power Factor

Considered for

battery Sizing

0.9

6.10 Ageing factor 1.25 6.11 End Cell Voltage 1.7V

5 CHARGER

5.1 Type For IGBT 5.2 Nominal Voltage

Regulation

+/ - 1%

5.3 Ripple (Without

Battery)

< 1%

5.4 Charging method Constant Voltage Constant Current

(CVCC)

5.5 Max. charging

Current

Vendor to specify

5.6 CHARGER PROTECTION

5.6.1 DC over current Required 5.6.2 DC over voltage Required

5.6.3 Input over voltage Required

5.6.4 Input under voltage Required 5.6.5 Battery charger

rating

Vendor to specify

5.6.5 Battery charging

duration

Vendor to specify

5.6.6 Phase Sequence

Correction

Required

5.6.7 Automatic

Equlisation charging

of battery

Required

6 BATTERY

6.1 Battery voltage 12 V 6.2 Type Sealed Maintenance Free(SMF)

6.3 Battery capacity (in

AH)

Vendor to specify

6.4 Battery bus voltage - V DC

Vendor to specify

6.5 Battery Make

6.6 Battery Rack

dimentions

L X W X H (in mm)


22-22

7

INVERTER

IGBT based Space vector modulation

INVERTER PROTECTION

7.1 Low battery voltage Required

7.2 Output short circuit Required

7.3 Output over curent Required

7.4 Output over voltage Required

7.5 Output under

voltage

Required

7.6 Thermal protection Required

8 BYPASS STATIC SWITCH

SCR based, Bi directional , make before

break type, fully electronics.

8.1 Transfer (Inverter to

bypass)

In Sync.Mode – No break in transfer

In Async.Mode - < 5mSec

8.2 Retransfer (Bypass

to Inverter)

In Sync.Mode – No break in Retransfer

9 MANUAL BYPASSFACILITY

9.1 Changeover from

static bypass to

manual bypass

Without break.

10 EFFICIENCY (At full load & nominal input voltage)

10.1 Inverter efficiency

(DC to AC)

Vendor to specify

10.2 Conv. efficiency (AC

to DC)

Vendor to specify

10.3 Overall

efficiency(AC to AC)

Vendor to specify

10.4 at 50% load

capacity

Vendor to specify

10.5 at 75% load

capacity

Vendor to specify

10.6 at 100% load

capacity

Vendor to specify

11 SPECIFIC

OVERLOAD TIME

11.1 at 110% Load Vendor to specify






22-23

12 ENVIRONMENTAL

12.1 Acoustic noise

level

< 65db @ 1 Mtr.

12.2 Design

temperature

50 Deg C Ambient design without

derating

12.4 Humidity Up to 95% RH, Non Condensing

12.5 Altitude

13 PHYSICAL

13.1 Enclosure

protection grade

Class IP 20

13.2 Cooling Forced Air

13.3 Colour Vendor to Specify

13.4 Cable entry Bottom

13.5 Weight in Kg. (Vendor to specify)

13.6 Dimensions (in mm)

(W x D x H)

( Vendor to specify)

13.7 Thickness of enclosure

(Vendor to specify)

13.8 Bottom frame with

sufficient load

bearing capacity

required.

14 METERING &

DISPLAY

LCD display Required

14.1 Input voltage Required

14.2 Input current Required

14.3 Power factor Required

14.4 Power (in Kw) Required

14.5 Output voltage Required

14.6 Output Current Required

14.7 Output power (in Kw)

Required

14.8 Load in % Required

14.9 Fault type Required

14.5 Frequency (Output) Required

14.6 Frequency (Input or bypass)

Required

14.7 DC Voltage Required

14.8 DC Current Required

14.9

Comprehensive LED

mimic required

with the single line

Power Flow

Diagram

Required


15 Inbuilt output

isolation

transformer for

individual UPS

Required.

16 Type of I/P

Termination For UPS

Vendor to specify

17 ADDITIONAL FEATURES

17.1 Software For Pc

Monitoring

MODBUS protocol require

17.2 999 event data

logger with date &

time

Required.

17.3 Transient volatge

surge protection at

UPS input

Required.

17.4 Maintanance

bypass switch Required.

17.5 Inbuilt incoming

and outgoing

isolator

Required.

17.6 Cable from battery

bank to battery

circuit breaker

Cable from battery

bank to battery

circuit breaker

Vendor to specify

17.7 Battery bank

islolator (MCCB) Vendor to specify the Rating and model

17.8 Vendor to specify the cable and the

required cable shall be in the scope of

vendor

18 OTHERS

18.1 Testing of UPS &

battery without any

additional load

bank at full laod

and part loads

Vendor scope

22-24


22-25

Description

The UPS shall consist of rectifier/charger, battery, inverter, static transfer switch, maintenance bypass

Switch, Synchronizing Equipment, Protective Device and other Accessories. The UPS shall provide

continuous electric power within specified tolerance, without interruption, to the critical loads.

Normally electrical energy from normal plant power source shall be supplied to UPS System.

The Solid State Rectifier/charger shall convert incoming AC power to DC power. The rectifier / charger

output shall be fed to Solid State Inverter. The inverter shall convert the DC power into AC power, which shall

supply the load.Upon failure of AC power, input power for inverter shall automatically be supplied from the

battery with no interruption/disturbance in inverter output in excess of limits specified herein (in these

specifications).

At the same time, UPS shall energize an alarm circuit. The duration for which Battery shall supply A/C power

to O/P shall be minimum 15 minutes.

When A/C power is restored, the input power for the inverter and for recharging the battery shall

automatically be supplied from rectifier / charger output without interruption/disturbance in inverter output

in excess of limits specified herein (in these specifications).

The Solid State Circuitry used for both rectifier & inverter shall be IGBT technology.

Intelligent RS-232 Communication shall be possible which will Provide UPS status indications, electrical

parameters such as Input & Output Voltage, Load levels etc and unattended shutdown.

User-friendly LCD Display to indicate all important UPS parameters such as input voltage, output voltage,

battery level and load level shall be provided.

The UPS system shall consist of the following modular architecture

MODULAR UPS SYSTEM


MODULAR UPS SYSTEM

22-26

Bypass Mode: In case of inverter failure, the load is automatically transferred in to the auxiliary mains without

any interruption in the power supply. This procedure may occur in the following situations:

• In the event of a temporary overload, the inverter continues to power the load. If the condition

persists,output is switched in to the auxiliary mains via the automatic bypass.

• Normal operation, which is from inverter, returns automatically a few seconds after the overload

disappears.

• when the voltage generated by the inverter goes is out of tolerances due to a major overload

or a fault on the inverter

• when the internal temperature exceeds the maximum value allowed.

Battery Mode: In the event of a mains failure (micro interruptions or extended blackouts), UPS continues to

power the load using the energy stored in the battery. The expert battery system keeps the user constantly

informed on the battery status and on the remaining backup time adapted permanently according to the


ARCHITECTURE


Operation Mode

“Normal” mode. This is the most frequent operating condition. The energy is drawn from the primary mains


connected. The inverter is constantly synchronised with the auxiliary mains to enable load transfer (due to

an overcurrent or inverter shutdown) without any break in the power supply to the load.The battery charger


The system should not have an centralised control modules, the control modules has to be built in each

power module to improve the reliability of the system

Static Switch

The modular UPS system that the bidders provide shall use concentrated bypass and the bypass module

shall be hot swappable. A built-in bypass shall be provided

Control Modules

Architecture

MODULAR UPS SYSTEM

Module Management:

The modular UPS shall offer the ability to scale its capacity and/or redundancy by automatically shifting load

to fewer power modules and selectively place unnecessary modules in the “hibernate mode” based on the

sensed output load level. This is in order to drive the load higher on the remaining modules. Therefore, with

multiple modules, a UPS shall achieve 2-3% higher efficiencies than conventional operation when loaded

less than 50% of system rating. In case of instantaneous addition of full load on the bus, this modules should

assume load without any interruption to the total load.

A power module shall not be restricted to any specific slot. Power modules can be installed without having

to pre-configure. Configuration shall be entirely automated.

Eco Mode:

In bypass operation, an even higher operating efficiency may be achieved without sacrificing protection

when there are good power conditions. Depending on configuration, efficiency can exceed 99%.The load

remains in bypass mode until the input voltage exceeds tolerance levels, and then enters full protection

mode. This setting is disabled by default and can be configured using the display.

22-27


Scalable Power Modules

The system shall be comprised of 25/30 kVA power modules and shall be capable of being configured for

N+X redundant operation and power modules should be hot swappable to facilitate the scalability without

any disturbance to load.

Load Test at Site:

UPS should have the ability to perform a full load test in double conversion mode without the connection of a

load bank.

PHASE SEQUENCECORRECTION

22-28


Phase Sequence Correction

The system should have inbuilt phase sequence correction and should continue to operate in mains mode.

The UPS system shall have LCD Display for monitoring the parameters and status of alarm. The UPS

shall be provided with a mimic diagram on the front door of cubicle housing the system. The failure of

display should not lead to the system failure. The system should work normally without the display.

Display and Metering

The overall AC-AC efficiency of the UPS shall be not be less than 95%.The efficiency shall be measured under

the following conditions


• The battery are fully charged and floating on the system



Efficiency

Environmental Conditions

The UPS shall be designed to work in following environmental conditions:

• Operating temperature 0-40 deg C

• Relative Humidity 0-95%

• Storage temperature : - 25°C to 50°C

• Operating altitude 1000m above MSL

Fault Tolerance:

The combination of the modular UPS and the parallel redundant architecture shall confine the component or

PCB failures to a single power module. The remainder of the system power modules shall not be affected and

shall continue to provide protection to the critical load. With the N+1 parallel redundant architecture, the UPS

faulty power module is isolated from the working units thus providing the system fault tolerance.


• Normal operation, load power ____% • Battery operation, time ____minutes. • Bypass operation.

• Standby


Indication Lamp shall be provided for Red LEDs shall be provided for ON indication, Green for OFF

indication and Amber for fault indication, Main ON, Battery ON, Inverter ON, and Low Battery. Each power

module shall also have its own display, the following parameters of each power module.






DISPLAY ANDMETERING

22-29


Indications: Each UPS module shall be equipped with a mimic to indicate power flow to the critical

load along with an indication of the availability of the rectifier/charger, battery, automatic bypass,

inverter and load. The mimic shall provide a quick and easy indication of the load level (displayed on LCD),

including for overload conditions (displayed on LCD). This power flow is also shown in the LCD menu.









Reference Standards

ISOLATED POWERSUPPLY

22-30


The static uninterruptible power system must be designed and produced in compliance with the following

international standards

• EN 62040-1 “General and safety requirements for UPS used in operator access areas"

• EN 62040-2 “Electro Magnetic Compatibility requirements (EMC)”

• EN 62040-3 “Performance requirements and test methods”

• Overload

• DC overvoltage


• Rectifier fault


• Mains failure


• Fuse failure



• Inverter fault


• Ups fail

• Short circuit

• Battery charging



facility over separate push buttons. The annunciation system shall cover the faults described earlier for

the entire UPS system including in the following

Annunciations :

Datasheet

The UPS system shall have nominal output voltage of 230/400V and shall be

designed for parallel ope ration with and charging of stationery batteries. The

UPS system must be double conversion online UPS to support the load

requirement 24x7 for number of years without any problem/ issue. The UPS

system shall include:

- Connection points for at least 2 st ring of batteries.

- UPS modules with a nominal output voltage of 230V/ 400V AC

- Battery charging automation.

- Control unit and User Display unit

- Static By pass unit with bypass voltage selectable

- Maintenance bypass unit

- Double conversion, IGBT converters, three level converters

Associated installation materials including connecting cables, runways etc.

complete set.

UPS capacity Modular UPS with installed capacity of 400 kVA or near (± 5%)

Power

saving/

Energy saving

technology

The UPS system must have module management system. This features works to

optimize the efficiency and maximum output .This system will automatically

suspend/ engages the modules based on the load requirement.

Rating

standard

IEC 62040 – 1, 2 & 3 for electrical safety, EMC and performance & voltage

stability in transient state

Hotswappable

The proposed UPS system should have features for the plug and play for all

parts during live operation

Requirement Must have equipped with both static bypass & maintenance bypass switch.

Bypass

Transfer

In case of major fault, the UPS must automatically transfer to static bypass

without much affecting the UPS system

Modular &

Scalable

The UPS system must be modular one with scalable & expandable. Modules are

connected in parallel and shall have a function for sharing the load equally.

Individual

Module

Capacity

The Capacity of individual module should not be more than 30 kVA

Efficiency

When designing the UPS modules as well as the entire UPS system, the criteria

should be good overall coefficient of efficiency. The target value shall be >95%

for the entire system when the load is >40% with double conversion and >98%

with energy saving mode.

Technology UPS must be double conversion online UPS with IGBT converters

Battery fuse

unit

The UPS system shall have at least 2 battery string connection and

corresponding connections for connecting batteries. An alarm signal indicating

blown battery fuse shall be send to the systems supervision unit

Parallel

operation The UPS system must support to make external paralleling of minimum 3 units

Surge

Protection

All connections of the modules (including alarm contacts) shall have overvoltage

protection. The system should be equipped with relavant SPD devices

Reverse

connection

protection

The UPS system shall be able to start if connected to a battery with the positive

and negative branch reversed, without taking any permanent damage

22-31


Features &

Functional

SpecificationsEvaluation pointers Compliance

22-32

Construction The rack should be constructed with minimum of 1.6 mm thick steel sheet, dually powder coated after 7/10 tank process.

Equipment mounting

The inside mounting should be done in such a way that the cooling is not significantly hindered. The supplier must state the minimum distances between mounted cases in all direction. However the distance between cases and also

between any case and nearby walls must be not less than 60mm.

Ingress protection

The UPS system (any type) cabinet should be compatible to use for both indoor/ outdoor application. The recommended IP rating class for indoor is IP 21/22

Rated input voltage

Rectifier system 230/400V AC (Selectable 220 – 240V/ 380 – 430V) bypass System 230/400V AC (Selectable 220 – 240V/ 380 – 430V)

Voltage tolerance

range

280V – 480V ( -30%, +20%) at 70% load

Input frequency

50 Hz with tolerance level of 45 Hz to 55 Hz

Input THD % < 5% (non linear load) <1% (100% linear load)

Inrush current

Less than 100% of rated current

Input power factor

>0.99@full load

AC output 230/400, 220/ 380/ 240/ 415 Vac.configurable. If the input voltage will derate to 50% then output of the UPS should not derate more than 40% of actual

capacity.

Rated output frequency

50 Hz with maximum variation of ± 0.1 Hz slew rate of 1 Hz/s

Voltage stability

Should comply with IEC/ EN 62040 – 3, class 1 for transient state & ± 1% for steady state

Output voltage

distortion

Must be <1% for l inear load and <5% for Non - linear load

Load power factor

> 0.98 at 40% load or more

Short circuit capacity

200% of rated current

There should be Inrush current l imitation facility so that output current shall increase slowly to protect UPS system

Current l imitation

The UPS must have a provision for l imiting the output current from 20% to 100% of the full rated load (adjustable). However the UPS must be capable of withstanding 110% of full rated capacity.

Overload capacity

Capacity must be without Bypass. 10 min upto 125% Load and 1 Min for >125% load. Continuous runn ing upto 109% load.

UPS

controller

The UPS systems control unit shall supervise the different units in the UPS systems. It also control over the functional operation of the system for reliable

and smooth operation

UPS controller/ control system must control more modules if added to increase the capacity without any change in software configuration.

Display and

measurement

The control unit must be equipped with an alphanumeric LCD/ LED display and the language used in the display shall be english. The display unit must provide

the information related to UPS operation and electrical parameter. The same can be monitored via remote monitoring as well

Slow / Soft

Start of module


22-33

Real time

remote

monitoring

The controller unit should have built in RMS for the designed power solution

capable of monitoring & controll ing UPS/battery/Load management to

ensure the proper or extend running of storage batteries and UPS system such

as load shedding, load sharing, charging batteries etc. All defined alarms and all

relevant par ameters must be readable from the display unit or dash board for

real time updates,PUE etc and monthly report extraction.

Control

interface

remote

monitoring

The UPS Controller unit should support all the connection interfaces to connect

remote monitoring & control to communicate with different supervision

management system via for performence & fault management system

• GSM modem

• RS/EIA485 (with modbus RTU protocol)

• CAN Bus

• SNMP/ TCPIP

SNMP Version

The control unit shall be compatible with the latest versions of SNMP:

- SNMPv2c, RFC1901-RFC1908

- SNMPv3, RFC3411 - RFC3418

MIB Version

The control unit shall be compatible with the latest MIB versions:

- MIB -I, RFC1156

- MIB -II, RFC1213

Communication

Protocol

The communication protocol for the proposed controller system must be open

and standard one compatible to any centralized monitoring system for

integration. This system must need to integrate to fault management system

Low voltage &

high voltage

protection

The control unit shall have a function for overvoltage/undervoltage protection. If the

system output voltage rises/ decreases above permitted value an alarm shall

be sent. The limit for the overvoltage protection and lower voltage shall be

adjustable. An alarm shall be activated in both the cases.

User Interface

Software

Supplier must have to provide user interface software for free of cost to

integrate in service engineer’s laptop for either site connection or remote

connection.

Alarm / event

log

Controller must be capable to store the history data for a minimum of 3 months

(more is better)

Sleep mode The controller should have sleep mode operation features for the UPS system

to reduce the energy consumption in case of less load demand

Periodic

charging

Periodic charging feature Provision for equalizing charge in order to keep the

batteries completely charged in case of long floating period must be available

Alarm test

facil ity

The facil ity for testing the general alarms and lamps shall be provided with the

power system in operation.

Switches and

function

adjustments

(i) It shall be possible to adjust and check the control l imits from the front side

of the UPS control system.

(i i) The following switches or similar functions shall be accessible in the control

unit:

• Start/stop UPS operation

• Reset of fault alarm

• Parameter setting

Alarm signals

The alarm signals generated by the UPS system/ power plant shall be

indicated to maintenance center/ NOC. Audible & visible alarm shall be

provided in the control unit panel. The alarm shall be sent via relays, modem

or LAN/WAN (i.e. TCP/IP), GSM, dry contact or equivalent to RMS connectivity

connection to different supervision management systems.


• Output AC overvoltage/undervoltage

• Battery fuse tripped

• Grid/ Mains Failure

• UPS module not charging

• UPS module faulty

• Battery boost charging in progress

• Plug out alarm indication for UPS, fuse breakers etc.

• Battery discharging

• Battery undervoltage alarm

• Battery disconnect

• Mains overvoltage/ undervoltage

• Main phase missing

• UPS module fan fault

• High temperature

UPS system

controller

alarms

The UPS system controller should be compatible for the remote monitoring and

control features: Supplier to confirm.

Alarm

display/

Monitoring

All alarm shall produce both a local and remote indication. Remote indication is

given by a closing contact. Remote indications shall be wired to terminal blocks

Relay points

The UPS system shall have at least eight (12) relays for remote alarms. The relays

shall have potential free alarm contacts and change (shift) in case of alarm. All

possible alarms shall be freely configurable to the alarm relays

Lifting lock The UPS system shall have proper l ifting points and additional l ift pockets for

ease of transportation.

Disassembly

and assembly

(Optional)

The UPS system shall be preferably able to be split in portable, dismountable

parts for carrying the system in difficult terrain. By disassembling and

assembling of the internal components/ parts the warranty of the UPS system

should not be violated. The supplier shall state if disassembly and assembly is

possible by certified Implementation teams in the field.

Packaging

The UPS modules, the system and cabinets shall be packed in suitable, frame

reinforced packages that provide protection against dust and humidity and are

suitable for handling with fork lift trucks and transporting by lorry.The packages

shall bear the following outside markings on top and two sides:

"UPS system”, type and serial No.

Electrical

enviroment

The contractor shall provide to the buyer with approved test protocols of the

electrical safety and EMC tests of the equipment

Operating

temperature

UPS system completely should operate in full load condition in an ambient

temperature of 0°C to +45°C where as individual module can operate in an

ambient temperature of - 5°C to+50°C

Altitude(max) 1000m above sea level at 40°C . Max 2000 m with 1% derating per each

increasing 100m

22-34


22-35

Transport &

storage

conditions

It shall be possible to transport and store the UPS systems without risk of

damage following conditions specified in ETSI EN 300 019 -1-2, Class 2.3. During

transport, the system must be able to withstand all ambient temperatures

ranging from - 20°C to +50°C for a maximum of 60 full days

Spare

The supplier must ensure the availability of the spares part for at least 10 years

or for 5 years after EoP (end of production) of offered equipment / product

model.

Service

Support

The bidder must have their offices/service partners at Nepal having experience on

similar field for 2 Years.

Warranty for

UPS system

The manufacturer warranty for the UPS system shall be a minimum of 2 Years.

Warranty will start from the date of PAC issued.



22-36


Design, Manufacture, Testing, Supply and supervision for installation and commissioning of 5KVA,

8KVA & 10KVA Medical Isolation Panel for OTs, ICU/ICCUs & NICUs as per IEC 60364-7-710 & BIS SP-30

Part-3 Section-IV consisting of following:

A medical ungrounded (IT) system shall be designed with 230VAC 63A, 10KA input MCB, Input Voltmeter

& Ammeter, 5KVA/8KVA/10KVA 230/230 VAC single phase Medical isolation transformer according to IEC

61558-2-15 (safety of power transformers, power supply units and similar – part 2 – 15: Particular

requirements for isolating transformers for the supply of medical locations.) in conformance to additional

requirements of IEC 60364-7-710 (Electrical installations of buildings – requirements of special installations

or locations – Medical locations) for low leakage at secondary side including provision for overload and high

conformance to IEC 61557-8 (Electrical safety in low voltage distribution systems upto 1000V AC and 1500

VDC – Equipment for Testing, Measuring or monitoring of protecvtive measures – part 8: Insulation monitoring

devices for IT systems.) and IEC 60364-7-710, 12nosof 230 VAC, 20A, 1KA, DP MCB for load distribution,

with on-line 12- channel insulation fault location system in conformance to IEC 61557-9 for medical locations.

All the above devices shall be installed and prewired in MS CRCS fabricated Panel painted to Grey Shade,

fan cooled, cable entry from top ready for installation at hospital premises. Separate Remote Alarm Indicator

for display of Insulation, transformer Overload and temperature alarm and other status indications at remote

suitable location.

1.0 Scope:

This specification covers the design and requirements for electrical safety in critical rooms (Group 2) like

Operation Theatres,

Intensive Care Units, Anaesthetic Rooms and Premature Baby Rooms in hospitals and medical

establishments as per

IEC 60364-7-710 and Provision P5 as per IS-SP30-Part 3Section 4-2011.

Isolated Power Supply

22-37


2.0 Reference Standards:

IEC 60364-7-710: Electrical installation of buildings – Requirements for special installations or

locations – Medical locations IS SP30 2011-India: Part-3, Section-4: Medical establishments

3.0 Introduction:

In hospitals and in medical locations safe and secure power supply to mains supplied

equipment intended to be used for life-saving and life-supporting measures which affect the

health and safety of patients in case of failure or by current passing through the human body due

to leakage.

Medical locations are divided into 3 groups as per IEC-60364-7-710 considering the

application of medical technical equipment on the patient. Group 0, Group 1 and Group 2. In

IS- NEC-SP-30-2011 all Hospital locations are categorised under seven groups of safety

provisions namely P0 to P7. Operation Theatres, Intensive Care Units, Premature Baby Rooms,

Anesthetic Rooms etc. are categorized under safety provision P5. Therefore P5 category

locations as per NEC & Group 2 medical locations as per IEC are critical areas, because a failure

of the power supply or leakage currents higher than 10 ìA passing through the dissected human

body & discontinuity (failure) of the supply can lead to an immediate threat to the life and limb of

the patient.Group 2 or P5 category locations are Anaesthetic rooms, Operating theatres, Heart

catheterization rooms, Angiographic room, Intensive care rooms, Premature baby rooms etc.

4.0 Requirements:

For Group 2 or P5 category locations medical IT (Ungrounded) system shall be used for

circuits

ISOLATED POWER SUPPLY

22-38


supplying medical electrical equipment and systems used for life support, surgical applications and other

electrical equipment located in patient environment excluding circuits of operating tables, X-ray units and

large equipment greater than 5 KVA.

The above excluded circuits of operating tables, X-ray units and large equipment greater than 5 KVA can be

supplied from a grounded (TN-S) system with an RCD/ELCB with a rated residual-operating current not

exceeding 30 mA.

As a standard practice separate medical IT (Ungrounded) system shall be used for power supply sockets for

electrical surgical & life support equipment and that for supplying to operation theatre lamps. Preferably

different power source shall be used for both the independent medical IT system.

4.1 Design of Medical IT (Ungrounded) System:

The advantage of an ungrounded system is increased availability and continuity of power supply and

reducing the magnitude of leakage current thereby avoiding shock and fire. Care shall be taken that the

conventional touch voltage in the group2 location does not exceed 25 V by providing very low resistance

earthing and equipotential bonding of non-active conductive parts.

4.1.1 Medical IT (Ungrounded) System

The ungrounded power distribution system panel shall consist of the following.

The input circuit breaker shall be double pole, single phase type. Rating of input CB shall be 300 VAC, 63A

with breaking capacity 10KA. Only short circuit protection without overload protectionshall be provided.

A single-phase isolating transformer according to IEC 61558-2-15 shall be provided with a maximum rated

power of 10 kVA as specified in IEC 60364-7710. The isolation transformer shall be two winding with earthed

isolation shield between the two windings. Further specifications are: secondary voltage of AC 250 V and a

maximum transformer secondary leakage current of 0.5 mA to earth. In order to protect the transformer and

the connecting leads between the primary and secondary terminals and the distribution bus against

overload and over temperature, monitoring the load and temperature of the transformer is required. A visual

and acoustic alarm shall be issued when the permissible load current and/or temperature are exceeded. For

monitoring, a combination of temperature monitoring (PTC thermistors in the winding of the transformer) and

current monitoring through CT shall be utilized in order to detect both a gradual heating of the transformer as

well as the occurrence of a transient load when connecting high-capacity electrical equipment.


22-39



The transformer shall be fan cooled. The isolation transformer shall be installed near the critical medical

room as close as possible. It shall be enclosed in cabinet or enclosures to prevent unintentional contact

with live parts. Considering the load diversity in a typical OT, 10KVA isolation transformer is sufficient. If

the total load in one medical room or location, like in a larger ICU, is more than 10 KVA then more than

one transformer with individual transformer rating of 10 KVA maximum to cater to the loads shall be used.

The output circuit breaker shall be double pole, single phase type. Rating of output CB shall be 300 VAC,

63A with breaking capacity 10KA. Only short circuit protection without overload protection shall be

provided.

In case of an ungrounded system, an insulation monitoring device shall be provided at the secondary

side of the isolation transformer to indicate the occurrence of a first fault from live part to

exposed-conductive-parts or to earth. This device shall initiate an audible and/or visual signal which

shall continueas long as the fault persists. It is recommended that a first fault be eliminated with the

shortest practicable delay.

According to IEC 60364-7-710 & IS-NEC-SP-302011, an ungrounded (IT) system shall be equipped

with an insulation monitoring device with the following requirements:

• The AC internal impedance shall be at least 100 kÙ

• The test voltage shall not be greater than DC 25 V

• The test current shall, even under fault conditions, not be greater than 1 mA

• The response value shall be ≥ 50 kÙ

• The indication shall take place, if the earth or wiring connection is lost.

The measuring technology shall be universal for all ungrounded distribution systems with AC, AC/DC,

DC loads. Further the measuring technology shall adapt to the changing load conditions in a modern OT,

ICU and ICCU in hospital. The measuring technology along with special filtering system shall be highly

accurate and very robust without generating spurious or missed alarms even in the presence of modern

electronic and processor based equipment. Only DC voltage injection based measurement technology

shall be avoided as it is prone to inaccurate measurements and spurious alarms leading to unreliable

measurements.

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For testing the insulation monitoring device a test button shall be provided directly at the device and in the

remote alarm indicator and test combination. Self diagnostics shall be provided. In this way interruptions in

connecting leads to the system and to earth are immediately recognized and indicated. The insulation

monitoring devices shall comply with IEC 61557-8. Following indication & alarm shall be provided.

• A green lamp to indicate normal operation

• A yellow lamp and audible alarm to indicate insulation fault below set value

The number of load distribution feeders shall be limited for smaller size of distribution system. 12/16 nos.

Of load feeder MCBs shall be provided for each isolation transformer. The MCBs shall be double pole single

phase type. The rating shall be 300 VAC, 20 A maximum with breaking capacity 10KA. The load MCBs shall

have both short circuit protection and overload protection.

In operation theatres & intensive care units, it is advantageous to use insulation fault location systems.

The insulation fault location system is recommended as per IEC60364-4-41.Insulation fault location systems

are recommended to be used in Group 2 locations like in OTs, ICUs & Premature Baby Rooms for the

following reasons.

• A large number of socket-outlets are installed in an operation theatre/intensive care room so that the

detection of defective devices or faulty circuits involves a lot of time and costs.

• Often, the OT & intensive care bed cannot be used during fault location, since devices which support

vital body functions have to be disconnected. Therefore on-line fault location is recommended.

• Available personnel resources do not allow immediate fault location.

The earth fault location system shall consist of on-line insulation monitor integrated with test pulse device,

earth fault evaluator, number of special CTs(Sensors) depending on number of branch feeders.

The on-line insulation monitor shall continuously measure the insulation resistance of the entire galvanically

connected ungrounded system including all connected loads. Whenever the insulation of the system drops

below the presetvalue an alarm shall be generated and a test current driven by the system being monitored

shall be generated alternately between each phase conductor and earth. This test current shall be detected

selectively by means of special residual current transformers with evaluators. The design of the system shall

be such that it rejects the noises in the power supply and distribution systems and shall be sensitive to the

test current generated by the system. The system shall be robust and reliable without generating nuisance

alarms. For safety reasons the test current shall be limited to 1 mA. The sensitivity ofsensors shall be 0.1 mA

minimum and measuring range between 0.1 mA – 1 mA. The earth fault location system shall comply with

IEC61557-9.


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The distribution cabinet/panel shall house the input CB, output CB, insulation monitor, load

distribution MCBs, insulation fault location system. The cabinet shall be fabricated out of

14-gauge stainless steel or CRCA sheet steel in cubicle compartmentalized wall mounted,

dust and vermin proof with reinforcement of suitable size angle iron, channels T sections and / or

flats wherever necessary including 2 mm thick stainless steel door fitted with stainless screws

(Degree of protection IP30 minimum). Knockouts shall be provided at the top / bottom of the panel.

Panels shall be treated with all anti-corrosive process before painting. Paint shade shall be light grey

or as approved. Cabinet/Box shall be with all components mounted and pre-wired.

Incoming & outgoing cables shall be directly wired to Switches & Breakers or through terminals.

4.2 Remote Alarm Indicator for Medical/Technical Staff:

Due to insulation, load and temperature monitoring and fault location, the medical staff is informed

at an early stage, before a critical failure in the power supply occurs.

The following conditions shall be monitored and reported to the medical/technical staff by a remote

alarm indicator and test combination:

1. If a faulty piece of equipment is plugged in, the system will detect the insulation fault and

issue an alarm alerting the user to unplug the equipment and have it repaired.

2. Should excessive load be placed on the system, it will display the increasing load and will

sound an alarm as the load approaches 100%.

3. Should an overload or fault cause the transformer temperature to rise above normal levels

will sound an alarm and indicate the problem.

The information shall be indicated by an remote alarm indicator and test combination at a suitable

place in the medical location so that it can be permanently monitored (audible and visual signals) by

the medical staff (normal operation: green LED, alarm: yellow LEDs).

The information regarding the faulty feeder shall also be indicated in the remote alarm indicator

for ease in maintenance and troubleshooting.

4.3 Environmental Qualification:

Ambient Temperature : - 10 deg.C to 55 deg.C

Relative Humidity : 95% non-condensing


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