specification for 12 / 24 kv rmu (gis / ais - sf6) with ... 02-… · 5-2 -load break switches: a....

Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة

Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر

EDMS 02-400-1 EEHC DISTRIBUTION MATERIALS SPECIFICATION

Date: 23-06-2016

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EDMS 02-400-1

SPECIFICATION

FOR

12 / 24 KV RMU (GIS / AIS - SF6)

With Motorized Load break switches

Issue: Jul-2016 / Rev- 1

يجب تحديدها بواسطة شركة التوزيع قبل الطرح. ( Option items)توجد بنود اختيارية




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CONTENTS

1- Scope …………………………………………………………………3

2- Climatic conditions………………………...…………………...…3

3- Design criteria …………………………………………………….....3

4- General Technical Data ……………………………………………..4

5- Switch board Contents ………………………………………………5

6- Inspection and testing ……………………………………...……….10

7- Marking ………………………………………………………………10

8- Drawing and catalogue ………………………………………………….11

9- Guarantee Tables………………………………….……….…...…...11

l O-Nameplate ……………………………………….……………........……11




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1. SCOPE:

This specification covers the design, testing, construction and supply medium voltage

switch board 12 / 24 K.V, 50 HZ equipped with SF6 load break switches and suitable

for indoor installation.

2. CLIMATIC CONDITIONS:

- Minimum ambient temperature : - 5 °C

- Maximum ambient temperature : 45 °C

- Maximum relative Humidity : 100 %

- Maximum altitude : 1000 m

3. DESIGN CRITERIA:

- 12 / 24 KV switch board for indoor use.

- The outer enclosure of the switch board shall consist of a heavy duty structural

steel framework of substantial sections and dimensions to carry safely items to

be mounted there in.

- The switch board is fully complying with latest edition of IEC recommendations as

well as other standards.

- The switch board sheet steel shall be not less than 2 mm thickness before painting.

- The enclosure doors shall be equipped with suitable gasket tape or tube to avoid

ingress of dust inside the unit.

- The paint shall be of electrostatic powder.

- The envelope is permanently sealed and filling with (SF6) gas at suitable pressure.

- The load break switch as well as earthing switch is operated by means of a handle

at the front ( one handle must be provided with each R.M.U)




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- The positions of the load break switch and earthing switch are indicated by movable

mimic position indicator gives immediate information about the position of the

switches at front of switch board.

- The cables shall enter the switch board from the bottom and the incoming and

outgoing cables which are XLPE insulated, 12/20KV / 18/30 KV and having aluminum

conductors up to 3 × 300 mm2 (or as distribution company requirement).

- Degree of protection not less than IP 3x.

- In case of GIS, The tenderer shall supply the elbow joint for each L.B.S.

- In case of AIS, All main B.Bs shall be insulated by heat shrinkable tubes (Red Anti-

Track) and the connection points with suitable insulated covers.

- In case of GIS, The all L.B.S. may be in one tank or every L.B.S. on a separate tank

according to distribution company requirement (as option).

- There is a mechanical interlocking between the load break switch and its relevant

earth switch so that :

a) Load break switch cannot be switched on as long as its earth switch is in the closed position.

b) Earth switch cannot be switched on as long as its load break switch is in the closed position.

- Access to the cable compartment is possible in the “earthed” position only.

4. GENERAL TECHNICAL DATA:

- Rated ( Maximum operating ) voltage : 12 KV / 24 KV - Nominal operating ( Service ) voltage : 11 KV / 22 KV

- Rated frequency : 50 Hz

- Power frequency R.M.S. withstand voltage ( 1 min ) : 28 KV / 50 KV

- Impulse withstand voltage (1.2/50) µs peak : 75 KV / 125 KV




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5. SWITCH BOARD CONTENTS:-

5-1-Bus Bars:

The Main Bus Bars are made of high grade of electrolytic copper at least 630 A,

the ambient temperature is 45°C and temperature rise shall be according to

IEC60271/103. The Busbar connections shall Anti- oxide greased

5-2 -Load Break Switches:

A. Three (3ph) Cable SF6-GIS / AIS L.B.S 12 /24 KV, 630 A, manual drive and

complete with its spring mechanism, for the cable feeders with earthing switch.

B. One (3ph) Transformer SF6-GIS / AIS L.B.S. 12KV / 24 KV, 200 A, complete with

its stored energy mechanism with built – in fuse carriers with three H.R.C fuses

(40 KA / 25 KA with rupture capacity), three poles of load break switch are

tripping if one fuse blows.

NO Items Specs.

1 Nominal current at 450 C temperature 630A

2 Short-time (thermal) withstands r.m.s. current for 1 sec. ( I th ) 25KA / 20KA

3 Peak (Dynamic) withstand current 62.5KA / 50KA




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The L.B.S. is prepared for Tele-control in case of need of SCADA system.

The Cable and transformer L.B.S motors designed to operate from external

supply ( 380/220 V+10%, -20% , 50HZ).

The ring switching operation shall be motorized as well as manual (by operating

handle) with independent fast acting operating mechanism. Closing and

opening speeds of the switch shall be independent of the speed with which the

operating motor is moved.

The mechanisms for operating the switches should be geared motors with the

possibility of manual operation without dismantling the motor

In order to prevent unauthorized access for the operation of ring main unit ,

ring switches, trip push button and local/remote buttons should be have

padlocking provision .

The padlocking provision materials should be adequately strong and compatible

with the life of ring main unit.

5-3-Capacitor Dividers and Phase Comparators:

Every load break switch cell equipped with three capacitors dividers connected to the voltage presence monitored by leds to indicate voltage presence on the cable.

There should be a facility to check the synchronization of phases with the use of external device.

NO Items Specs.

1 Nominal current at 45ºC temperature 200A

2 Short-time (thermal) withstands r.m.s. current for 1 sec. ( I th ) 25KA / 20KA

3 Peak (Dynamic) withstand current 62.5KA / 50KA




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5-4- Three Current Limiting ( H.R.C ) Fuses: The Transformer L.B.S. is equipped with three current limiting H.R.C. fuses.

Standard conditions of behavior w.r.t. breaking capacity

1. A powder filled fuse-link shall not emit flame or powder although a minor

emission of flame from a striker is permissible, provided this does not cause

breakdown or significant electrical leakage to earth.

2. After the fuse has operated, the components of the fuse apart from these

intended to be replaced after each operation shall be in the original state. It

shall be possible to remove the fuse-link in one piece after operation.

3. Strikers shall comply with the requirements specified in IEC 60282-1.

4. The values of cut-off current corresponding to each prospective breaking

current shall not exceed the values corresponding to the cut-off characteristics

given by the manufacturer.

5. After operation, the fuse shall be capable of withstanding the power frequency

recovery voltage across its terminals.

Fuse ratings:

– Rated voltage 12KV /24KV

– Rated frequency 50HZ

– Rated current according to transformer rating.

– Rated breaking capacity 40KA / 25 KA

Features required:

– The fuse links shall have the dimensions as per attached specification.

– The fuse link contacts shall be silvered plated.

– The fuse link body shall be of porcelain.

– On each fuse link the badge of ……EDC shall be printed.




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– Each fuse link shall be equipped with a striker, which complies IEC 60282-1.

– Time-current characteristics shall be in compliance with IEC 60282-1 and shall be

offered with tender. FUSE TESTS:

– Tests shall be conducted according to IEC 60282-1 and its amendments.

– Type tests certificates shall be offered with tender.

– Tests shall be made in accordance with IEC 60282-1 and may be witnessed by

…….EDC representative.

FUSE LINK

RATING

Dimension in mm

e L L D d

12 KV ≃ 290 ≃ 360 ≃ 35 ≃ 62 ≃ 45

24 KV ≃ 442 ≃ 508 ≃ 33 ≃ 69.88 ≃ 45

5-5- Earth Fault Indicators:

Description:

The Earth fault indicator is two component instruments which consists of

transformer and the indicating electronic circuit, the transformer consists of coil

L

e

l

D d




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and core balance current transformer, the housing of indicating facility with a

fluorescent coated red flag, this indicator will be mounted above the (R.M.U) in

an easily visible position and will be weather proof.

Features:

- The earth fault indicator designed to operates from external supply {(380/220 v

+ 10%, - 20 % v), 50 c/s.}.

- The C.T. will be designed to give thermal protection to the indicator during

heavy earth fault, and can allow for cable fault currents up to 25 KA / 20 KA

(r.m.s.) and can operate satisfactory at cable sheath temperature up to 85 ºC.

- Cable connection C.T. with indicating system will be within the loop resistance

recommended.

- Earth fault indicator will have a core balance current transformer and an

indicating facility with a flag and 2 auxiliary (N.O) contacts, with following

specifications:

1. Two normally open aux. contacts free rated current 1 A.

2. The closing of the aux. (2N.O) contacts shall satisfy synchronization with

the flag drop.

i.e., contacts close when E.F current reaches 25 ± 10 % A, and continue

closing whether the E.F current in the power cable still flowing with this

value and the aux. A.C {380/220 v (+10%, -20%) } still present or the E.F

current and the aux. A.C voltage are disconnected by the protection

relays in the distribution switchboard.

- Earth fault indicator is equipped with a mean for testing its operation.




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- The flag turns to red color in case the earth current occurs and increase of the

rated pre-set value (e.g. 25±10% A ).

- Operation a red indication will be clearly visible from a distance 2m at least in

day light.

- Indicator will automatically reset by the healthy starting transient current.

Specifications:

- Trip current : 25A

- Accuracy :better than ± 10 %

- Flag response time : ≤ 0.1 sec.

- Response time : ≤ 0.1 sec.

- C.T. is suitable for Cable diameter .

- Allowed earth fault ( surge current ) : 25 KA / 20 KA (r.m.s.)

- Ambient temperature : - 5 to + 45ºC

6. INSPECTION AND TESTING :

The RMU should be approved from the EEHC.

……..EDC may require its representative(s) to attend some or all of the routine

tests according to the IEC publications.

7. MARKING:

All the components of the units and enclosure shall be marked with marking

labels according to the applicable IEC standards and shall be fitted on all

components and enclosure to indicate its technical data. The unit is marked

with mimic diagram to indicate the switch type and its position (on / off).




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8. DRAWING AND CATALOGUE:

All necessary drawings including layout, dimensions, single line diagram of

primary circuits shall be submitted with the offer.

Technical catalogues containing the technical data for all offered

components of the unit shall be submitted.

Graph for fuse holder with dimension and material of components should

be submitted.

9. GUARANTEE TABLES

The guarantee schedules shall be submitted one for cable L.B.S., one for

transformer L.B.S, one for the switch board.

The tenderer shall fill in the attached guarantee tables.

Any tender not accompanied with clear and complete guarantee tables

shall be rejected.

10. Nameplate

Ring main unit shall be provided with Aluminum /Stainless steel nameplate

showing the following information marked in Arabic and English:

• …….EDC Item Number

• Manufacturer’s Name

• Type/Model




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• …….EDC Purchase Order Number

• Year of Manufacture

• Voltage Rating kV

• Current Rating Amps

• Rated Frequency 50Hz

• Gross Weight kg




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Guarantee Table For

CABLE L.B.S

No Item Specif.

1 Rated voltage

2 Basic impulse level

3 Power frequency withstand voltage

4 Rated Current

5 Rated short time current I th ( 1 sec.)

6 Rated making current I ma

8 Capacitive breaking current ( p.f. = 0.15)

9 Number of switching operations at rated breaking current

We guarantee the data given above for the equipment offered.

Signature: ………………………………

Date: ………………………………




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Guarantee Table For

TRANSFORMER L.B.S

No Item Specif.

1 Rated voltage

2 Rated load-breaking current

3 Basic impulse level

4 Power frequency withstand voltage

5 Rated current

6 Rated short time current I th ( 1 sec.)

7 Rated making current I ma

8 Capacitive breaking current ( p.f. = 0.15)

9 Number of switching operations at rated breaking current


Signature: ………………………………

Date: ………………………………




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Guarantee Table For

ENCLOSURE & FUSE

Item Enclosure

- Maker’s name

- Type

- Material

- Thickness of steel sheet

- Degree of protection

- Dimensions:

* Width

* Depth

* Height

Item Fuse

- Maker’s name

- Inner diameter




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- Outer diameter

- Electric properties

- Thermal properties

- Mechanical properties

- Dimension in mm :

- e

- L

- I

- D

- d


Signature: ………………………………

Date: ………………………………

specification for 12 / 24 kv rmu (gis / ais - sf6) with ... 02-… · 5-2 -load break switches: a....

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