Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 1 of 13
EDMS 21-100-1
TECHNICAL SPECIFICATION
FOR
POWER CAPACITOR BANKS AND ACCESSORIES
12 K.V
Issue: NOV-2015 / Rev- 1
يجب تحديدها بواسطة شركة التوزيع قبل الطرح. ( Option items) توجد بنود اختيارية
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 2 of 13
Technical Specifications
1- General description
The required automatic p.f controller as defined in item 1.1 is a shunt
capacitor bank (two groups)
Each group have a rating of 1.1, to achieve switching steps and provided
with a contactor.
Switching form step to step should be provided to operate automatically and
manually. The operation sequence which could be carried out after closing
the isolator and C.B is:
• Put the selector on automatic position for both steps.
• Measuring the reactive power of the load by the regulator (controller).
• If the power factor is lagging and reactive power =MVAR of
step1+0.1MVAR,then :
▪ Step1 contactor closes after time delay.
▪ Measuring again the reactive power of the load.
• If the compensation still not enough.
• (Reactive power=MVAR of step2+0.1MVAR),then
▪ Step2 contactor closes after time delay.
▪ Measuring again the reactive power of the load.
• If the P.F. becomes close to unity, both steps 1&2 remain in service.
• If the P.F becomes leading then step should be switched off.
• If the over voltage or over THD greater than 8% the contactors trip.
Note:
Delay time should be carried out by time delay relay and should be greater
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 3 of 13
than capacitor discharge time
Three phase capacitors:
The capacitors should be delta connection, and its rate shall be as
distribution company requirements.
Ratings :
• The maximum operating voltage of t h e capacitor unit is 12 kv
service voltage is 11 kv),the KVAR effective value calculated at service
voltage
• Rated frequency is 50 Hz.
• The upper limit of operating temperature e category of the required capacitor
unit shall be 55 °C according to {!EC 60871-1) the lower limit is 00 C
• Capacitor unit shall be suit able for operation voltages as follows (IEC
60871-1) . 100 % UN ......................................... Continuous Operation
110 % UN....................................For 1 2 hours every 24 hrs
115 % UN .............................. For 30 minutes in every 24 hrs
120 % UN ........................................................... ….For 5 min.
130 % UN......................................................................F..o. r 1 min .
• (The latest version of IEC-should be applicable in any case)
• Capacitor unit should be suitable for continuous operation at r.m.s current
of the current that occurs at rated sinusoidal voltage and rated frequency.
The capacitor unit should withstand a maximum current of 1.43In due to
the combined effect of harmonics and over voltages up to and including
110 %UN (IEC 60871-1 ).
• The capacitance tolerance shall be CLAUSE 7. 2 IEC 60871-1 2005.
Losses :W / KVAR:
• Losses in steady state rated voltage and frequency at 25 °C indoor ambient
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 4 of 13
temperature should not be more than 0.2W/KVAR (Lower values are
preferable).
External fuses:
• The capacitor unit shall be protected by external fuses. The fuses shall in
event of capacitor failure, function correctly at both, the operating
voltage range (0.9)√ 2 UN of the bank and momentary over voltages up
to the limit of 2√2 UN . The fuses must withstand the relatively high
inrush current
Capacitor bank
• The capacitor bank should be completely assembled in one metallic
cubicle (as drawing). Which contains: the high voltage connection,
contactors, inrush current coils and auxiliaries, the container should
have a protection degree and insulation level of IP 31 for indoor type.
• The capacitor banks shall include the racks for the capacitor units and
metal enclosure for live high voltage parts of the bank. Also meatal.
Insulation Material:
The Insulation of the capacitor unit shall be of synthetic. foils (poly
propylene - film), however the tenderer can submit paper insulation as an
alternative.
All PCB impregnates are not allowed for use in Egypt. Insulation shall be
of the (Ali - film). Type, each capacitor shall be completely vacuum
impregnated with no voids or air pockets to prevent corona and permit
mounting in any position .
Bushings:
Capacitor shall be of the three bushings type. Bushing shall be of well
process porcelain.
All bushings shall be hermetically soldered to the steel case. Heavy tin-
plated clamp type, terminals suitable for standard copper conductors. All
capacitor terminals shall be provided with insulating terminal cover
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 5 of 13
lnsulation Level :
The insulation level of the units should be equivalent to that of the bank
otherwise extra-insulation to the units is necessary.
The Insulation level· (Creepage distance) should be not less than 2.5
cm/kv for indoor installation. The withstand voltage should be as follows:
Power frequency a.c withstand test voltage (r.m.s) for 12 KV capacitor bank
is 28 kv (!EC 60871 -1} latest edition.
Withstand impulse test voltage crest value for 12 kv capacitor bank is 75 kv
(!EC 60871-1)
For external insulation. The power frequency withstand voltage under
pollution severity for 50 micro siemens (.is or higher for 12 kv capacitor
banks is 1.25 Un=15 kv.
Internal Discharge Device:
• Each capacitor unit shall be equipped with internal discharge resistor
which shall drain the residual voltage from the operating voltage to 75
Volts within 10 minutes after the capacitor is disconnected from the
source of supply according to IEC publication. The maximum
discharge time is 10 minutes for both capacitors and banks.
• Protection box for low voltage and secondary connections of the bank
must be mounted at the works.
• Terminal blocks, internal wiring and cabling to the bank shall be
included. The tender shall provide the banks at the work with the
necessary high voltage wiring of the capacitor un it s and other
equipment and terminals of the bank.
• The metallic parts of banks such as racks, connect ion and relay boxes
shall be hot-zinced (at least 600g/m2), unless of aluminum.
• The degree of protection of the connection and relay boxes shall be IP
31 for indoor installations.
• The capacitors shall be installed in such a way that there is adequate
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 6 of 13
dissipation by radiation and convection of the heat produced by the
capacitor losses. For indoor capacitor banks, on e or more fans can be
mounted in the bottom of the capacitor compartment to provide
ventilation.
• The Construction for every compartment must take into consideration
the facilities of easy replacement of the capacitor units and the
maintenance carried out.
• The capacitor banks shall be equipped with coils to limit the inrush
current, contactors for the steps connection.
Circuit Breaker
A- The 12 K.V. circuit breakers shall be vacuum or SF6 type.
B- The necessary closing, tripping and blocking coils shall be {110 V DC). with an
electric spring charge universal motor drive {110 V DC ) or magnetic actuator
mechanism consist of three coil s (one per pole) and all phases connected to each other
using synchronizing shaft. The circuit breakers shall be mechanically and electrically
trip free and with provision for manual operation.
C- Necessary auxiliary contacts for controlling, signaling& free contacts{4N O-4N C)
at least in low voltage compartment and all accessories needed for operation shall be
provided.
D- Each panel which attached with SF6 C.B shall be equipped with double Flag relay
indication one for low gas pressure and another for insufficient gas pressure (in case of
insufficient gas pressure, C.B's shall be locked) .
E- The rupturing capacity of all the 12 K.V. circuit breakers shall be symmetrical
short circuit current of 25 K.A. for 3 Sec.
F-The normal current ratings is 630A .
G- All main fixed and moving contacts shall be silver plated.
H- The C.B used in the capacitor bank must have a good switching capability up to the
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 7 of 13
highest bank rating without restricting and thus without over voltages occurring.
I-The required C.B should be SF6/ vacuum type with operating mechanism of sprin g
operated device (motor-charged spring).
J-The C.B should withstand the following stresses:
*Sharp daily ambient- air temperature fluctuations for indoor/ outdoor banks
• The higher variation of the reactive power e.g the higher number of
operations during the day.
• The high frequency oscillations which may overheat and overstress
the capacitors.
• Standard IEC62271-100.
Unless otherwise specified the attached specification should be
comply with IEC Standard.
(SF6 automatic fused Load break switch as option according to
distribution company requirement)
The 3-phase L.B.S. should be capable of opening and closing the capacitor
bank 2nd carrying current under normal circuit conditions and carrying
for 1 Sec. short circuit current. The required L.B.S. should have auxiliary
contact and Complete with earthing switch and Complete with 12 KV.
H.R.C. fuses and fuse rupture capacity shall be> 40 KA.
The required specifications of the L.B.S. are:
Standard IEC 6 2271-60265
System voltage (KV) : 11
One-minute power frequency withstands voltage (KV) :
To earth and between phases 28 KV
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 8 of 13
Arms the isolating distance 32 KV
1 . 2/.50 (.is impulse withstand voltage (peak):
To earth and between phases 75 k.v
Across the isolating distance 85 k.v
Rated normal current (A): 400 A
Rated S.C. current (KA for 1 s) 25KA
-The earthing switch should have mechanical lock which prevents
its switching while the main switch is on.
-The L.B.S. can't be operated unless the capacitor bank contactor is
disconnected. This key lock shall prevent the L.B.S from breaking the
capacitor current and provide safety.
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 9 of 13
Circuit
Breaker Step 1 Step 2
Drawing Capacitor Bank Container
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 10 of 13
Table (1)
Capacitor Bank
No. ITEM EEHC Specs. Supplier Specs. Remarks
1 Rated capacity MVAR Natural and
forced ventilation
must be taken into
consideration for
the bank
2 Rated Voltage 12KV
3
Max.
Allowable over
current
130% IO
4 Frequency 50HZ
5 Connection of
capacitor Delta
6 Discharge time
to 75 600 sec.
7 Insulation level
of Bank 28/75 kv
8 Mounting
Inside the
container
indoor
9 Capacitor Bank
According to IEC 60871-1
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 11 of 13
Table (2) Inrush current coils
No. ITEM EEHC Specs. Supplier
Specs. Remarks
1 Inductance X µH
Calculated by
the
manufacturer
inside the
container
2 Max. Operating
Voltage 12KV
3 Service Voltage 11 KV
4 AC withstand
voltage 28 KV/1 min.
5 Impulse withstand
voltage 75 KV/1.2/50 µs
Table (3)
Control box
No. ITEM EEHC Specs. Supplier
Specs.
Remarks
1 Operating
Principle • With controller (Table4)
• Automatic & Manual
Operation
• Stand-by operation
• Key lock interlock with
L.B.S
2 Protection • Over voltage protection
(Table5)
• Over THDV
• Reserve polarity of C.T
3 Auxiliary
Voltage
110-220 V DC
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 12 of 13
Table (4)
Q-Controller
No. ITEM EEHC Specs. Supplier
Specs.
Remarks
1 Type 6 Steps With
display
2 Power Supply 110-220 V DC(+10% -
20%)
3 Control Voltage Taken from first two
phases (380v)
4 Control Current Taken form third phase
5 Frequency 50 HZ
6 Rated Current 5A
7 Rated Burden 3 VA
8 Manual
Operation
Momentary push buttons
9 Operating
Sequence
1:1times, 20-40 Sec. delay
10 Contact Ring 7.5 A, 250VAC normally
open
11 Ambient
Temperature
-5°C: 55°C
12 Accuracy Class 2.5
13 Protection
Class
IP40
Ministry of Electricity and Renewable Energy زارة الكهرباء والطاقة المتجددة و و
Egyptian Electricity Holding Company شركة القابضة لكهرباء مصر ال
EDMS 21- 100 - 1 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 17-11-2015
Page 13 of 13
Table (5)
Over Voltage Protection Relay No. ITEM EEHC Specs. Supplier Specs. Remarks
1
1st Stage
Voltage setting
range
Time range
100-115%U0
0-5 Sec.
2
2nd Stage
Voltage setting
range
Time range
115-130%U0
0-5 Sec.
3 Auxiliary Voltage 110-220 V DC
4 Contact rating 7.5A – 250V DC/AC,
NO
Table (6)
SF6 Contactor for Switching Process of Capacitor Bank
No. ITEM EEHC Specs. Supplier Specs. Remarks
1 Rated MVAR
2 System Voltage 12KV
3 AC withstand voltage 28 KV/1 min.
4 Impulse with stand voltage 125 KV/1.2/50
µSec.
5 Rated normal current 200 A
6 Rated S.C. Current 8 KA for 3 Sec.
7 Auxiliary Voltage 110-220 V DC
8 Poles Insulation medium
pressurized SF6 provided
9 Capacitor Bank According
to
IEC 62271-100