02 20020100 V1.10 EVRC2A Manual Circuit Breaker

Release Date: Jan 2006 / Manual Revision: 1.10

EVR AUTOMATIC RECLOSER USER’S

MANUAL

ENTEC

ENTEC ELECTRIC & ELECTRONIC CO., LTD

Copyright © 2002 by ENTEC ELECTRIC & ELECTRONIC CO., LTD all right reserved.

Forerunner Distribution & Automation

EVR AUTOMA AUTOMATIC TIC RECLOSER

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TABLE OF CONTENTS

GENERAL GUIDANCE........................................................................... GUIDANCE............................................................................................................ ................................. 5

1. INTRODUCTION .............................................. ..................................................................... .............................................. ...................................... ...............6 6 2. ST STANDARD ANDARD RATINGS RATINGS .......................................... ................................................................ ............................................. .................................. ........... 7 3. CONSTRUCTION................ CONSTRUCTION....................................... .............................................. .............................................. .............................................8 ......................8 3.1. INTERRUPTER................................................................................................................ 10 3.2. MAGNETIC ACTUATOR................................................................................................ ACTUATOR................................................................................................ 10 3.3. BUSHING ............................................................. ......................................................................................................................... ............................................................ 11 3.4. MANUAL TRIP/LOCKING DEVICE ....................................................... ............................................................................. ...................... 12 3.5. SF6 GAS ............................................................................. ........................................................................................................................... .............................................. 13 3.5.1. General ............................................................................ ................................................................................................................... ....................................... 13 3.5.2. Specification of Sulphur Sulphur Hexa Fluoride Gas (SF6)................................................ 13 3.5.3. SF6 gas pressure-Temperature pressure-Temperature Curve..................................................................... Curve..................................................................... 14 3.6. MOLECULAR SIEVE...................................................................................................... SIEVE...................................................................................................... 14 3.7. BATTER BATTERY Y AND BATTERY BATTERY CHARGER ......................................................................... 15 3.8. CONTROL CUBICLE .................................................................... ...................................................................................................... .................................. 16 3.9. AUXILIARY AUXILIARY POWER SUPPLY SUPPLY ................................................................ ....................................................................................... ....................... 17 3.10. GAS FILLING F ILLING VAL VALVE VE......................................................... ................................................................................................... .......................................... 20 3.11. ACCESSORIES...................................................................... ACCESSORIES............................................................................................................... ......................................... 20

4. PACKING, ACKING, HANDLING AND STORAGE ............................................ .................................................................21 .....................21 4.1. PACKING PACKING AND DESPA DESPATCH ........................................................... ........................................................................................... ................................ 21 4.2. UNPACKING UNPACKING AND HANDLING ....................................................... .................................................................................... ............................. 21 4.3. RECEIVING ............................................................... ..................................................................................................................... ...................................................... 22 4.4. STORAGE .......................................................................... ........................................................................................................................ .............................................. 22

5. INSTALLA INSTALLATION TION ............................................ ................................................................... .............................................. ........................................2 .................23 3 5.1. INSPECTION BEFORE INSTALLA INSTALLATION TION ............................................................. ...................................................................... ......... 23 5.1.1. General ............................................................................ ................................................................................................................... ....................................... 23 5.2. TESTING .............................................................................. .......................................................................................................................... ............................................ 23 5.2.1. Gas pressure ............................................................. ........................................................................................................... .............................................. 23 5.2.2. Battery check..................................................................... check .......................................................................................................... ..................................... 24

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EVR AUTOMA AUTOMATIC TIC RECLOSER

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5.2.3. Contact life of vacuum interrupter.......................................................................... interrupter.......................................................................... 24 5.2.4. Resistance test on current current carrying main circuit..................................................... 24 5.2.5. High voltage insulation test ................................................................. .................................................................................... ................... 24 5.2.6. Operation test ..................................................................... ......................................................................................................... .................................... 25 5.2.7. Secondary current current injection injection test ............................................................ ............................................................................. ................. 25 5.3. INSTALLA INSTALLATION............................................................................................. TION............................................................................................................... .................. 25 5.3.1-1. Standard pole mounting mounting of recloser tank............................................................. 25 5.3.1-2. Substation mounting mounting frame ....................................................................... ................................................................................. .......... 28 5.3.1-3. Surge Arrester mounting frame .............................................................. ........................................................................... ............. 29 5.3.2. Control cubicle ......................................................... ....................................................................................................... .............................................. 30 5.3.3. Earthing ........................................................ .................................................................................................................. .......................................................... 31 5.3.4. High voltage voltage connection......................................................................................... 33 5.3.5 Bushing.................................................................................................. Bushing.................................................................................................................... .................. 33

6. RECLOSER OPERATION OPERATION ............................................... ...................................................................... ........................................... .................... 35 6.1. GENERAL ................................................................. ........................................................................................................................ ....................................................... 35 6.2. OPERATION OPERATION PROCEDURE .................................................................... ............................................................................................ ........................ 35

7. MAINTENANCE ........................................... ................................................................. ............................................ ......................................... ................... 36 7.1. GENERAL ................................................................. ........................................................................................................................ ....................................................... 36 7.2. DISMOUNTING OF RECLOSER ...................................................... ................................................................................... ............................. 36 7.3. CONTACT CONTACT LIFE OF VACUUM VACUUM INTERRUPTER ........................................................... 36 7.4. SF6 GAS REFILLING...................................................................................................... 38 7.4.1. General .................................................................... ................................................................................................................... ............................................... 38 7.4.2. Refilling procedure............................................................... procedure ................................................................................................. .................................. 38

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EVR AUTOMATIC RECLOSER

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GENERAL GUIDANCE ENTEC automatic vacuum recloser hereinafter as EVR is designed to operate after installation on an outdoor pole and substation. This product consists of the minimum number of components to achieve maintenance free, maximum safety and endurance.

To ensure the maximum life and the best quality of operation, operate EVR in accordance with the instruction manual and keep the following guidance.

Be fully aware of the instruction manual before operating EVR.

Safety check is required before installing, operating, and maintenance EVR. After installation, connect AC 110/220V from the distribution line to the CONTROL CUBICLE and run a test operation.

If works need to be done after opening the control CUBICLE middle cover, turn the main circuit breaker (MCB) OFF to avoid any accident due to the high voltage.

Avoid any flame work such as welding and brazing on EVR because the main tank is filled with SF6 gas for insulation.

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1. INTRODUCTION This manual contains the information required for installation, operation, and maintenance of ENTEC EVR Automatic Recloser. EVR is designed to be powered from AC 110/220V low voltage distribution line. EVR complies with the international standard specifications and ratings.

EVR consists of the corrosion-resistance stainless steel tank (main tank) and the control cubicle, which are connected by separable shielded cable that is insulated. The main tank contains the vacuum interrupter and the magnetic actuator.

Although the main tank can be disconnected from the Control Cubicle, none of them can be exchanged with other products. If replacement is required, please consult with the ENTEC E&E Co. Ltd.

The inside of the main tank is filled with SF6 gas for insulation and the control cubicle is equipped with two of DC 12V batteries in series together. Batteries supply DC 24V control power to a control circuit after rectifying from low voltage AC source. General configuration of recloser is shown as below. H.V Connector

Polymeric or Porcelain bushing

Pressure rupture device

Manual trip & locking device

Gas filling valve LOCK TRIP

Earth terminal Control cable receptacle ON-OFF Indicator

Figure 1-1. Recloser Lay-Out Table 1-1. Dimension(mm)

6

kV

A

B

C

D

15kV

715

375

925

300

27kV

760

460

1020

300

38kV/630A

841

475

1058

320

38kV/800A

841

475

1078

320

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2. STANDARD RATINGS The standard ratings of EVR Recloser are as follows; Table 2-1. STANDARD RATINGS Maximum system voltage

15kV

27kV

38kV

Rated frequency

50/60Hz

50/60Hz

50/60Hz

Rated continuous current

630A

630A

630/800A

Rated short circuit interrupting current

12.5/16kA

12.5/16kA

12.5/16kA

32.5kA

32.5kA

32.5/ 40kA

(peak value)

(peak value)

(peak value)

- dry

50kV(1 min)

60kV(1 min)

70kV(1 min)

- wet

45kV(10 sec)

50kV(10 sec)

60kV(10 sec)

Rated impulse withstand voltage

110kV BIL

150kV BIL

170kV BIL

Mechanical operation life

10,000 operations

10,000 operations

10,000 operations

Rated making current Power frequency withstand voltage

Auxiliary power supply

AC110/220V external power sources

Control circuit voltage

DC 24V

DC 24V

DC 24V

Protection current transformer (CT) ratio

1000:1 A

1000:1 A

1000:1 A

- main tank

160kg

170kg

210kg

- control cubicle

85kg

85kg

90kg

Weight

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3. CONSTRUCTION The Recloser can be mounted on an outdoor pole by assembling a mounting bracket connected to the top of main tank and also installed at substation with substation mounting frame. The vacuum interrupter, magnetic actuator, and current transformer (CT) are contained in the TIG-welded main tank and filled with SF6 gas for the insulation of recloser main tank.

The interruption of Recloser is performed by the vacuum interrupter and SF6 gas is used to insulate. The recloser filled with SF6 gas does not produce any by-products by arc during interruption. Thus it maintains permanent insulation capability and prevent corrosion of the main tank components.

The Recloser interrupter arranged with the 3-phase dielectric mold frame, consists of the vacuum interrupter and the trip spring with the same distance. The driving arm connected at the end of moving contact transfers a driving force of the magnetic actuator to the interrupter for close and open operation.

The 6 bushings on the top of main tank can be supplied with porcelain, polymeric(E.P.D.M. rubber or silicone rubber) bushing upon to user's request. The current transformer (CT) is installed at the bushing connected at the fixed contact of interrupter in the main tank, and CT can monitor phase fault currents, earth fault currents and load currents, and send signals to the control electronics.

If the control cable of CT is disconnected at both end, the CT is automatically shorted by the automatic CT protection circuit.

The manual Trip/Locking device is positioned on the front side of main tank. The indicator points an interrupter's open/close status and the operation counter are located at the bottom of main tank.

The Recloser operation sequence is performed by the microprocessor-based relay. The relay is installed in the control cubicle protected by rain-proof case. The Recloser immediately performs a preset operation sequence to re-close when a phase/ground fault current is higher than the preset value.

If a fault current is not cleared at the end of full protection sequence, the Recloser will be lockout as tripped, and remains until the next close operation. If a fault current is cleared during the protection sequence, the Recloser is closed, and then returns into sleep mode after the reset time.

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When a fault current is detected, the recloser operates the pre-set full protection sequence again.

EVR is powered by AC 110/220V low voltage distribution line source without an additional transformer and is designed to consume low energy to operate reclosing and remote control. Thus EVR does not need any extra cost for installation of additional transformer, in case, low voltage source by utility is available.

In case that low voltage power source is not available, the recloser is fitted with an auxiliary voltage transformer to supply auxiliary power to the control cubicle. During open and close operations, the relay sends the pulse type current to the open and close coils, and the magnetic force is induced by those coils and moves the plunger of the magnetic actuator.

This driving force is transferred to the vacuum interrupter, which makes contact point tripped or closed. During trip and close operations, arc is produced and rapidly extinguished in the vacuum interrupter. The relay setting in control circuit can be modified at the control panel, a PC or remotely controlled communication method. For more details, refer to EVRC2A manual.

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3.1. INTERRUP TER The vacuum interrupter of the recloser can provides versatilities to operate trip/close with the ratings and capacity based on the fully capable of interruption. The closing status of the contacts is held by contact springs that provide the required force at all condition of contact wear.

As a vacuum interrupter is fully sealed for the lifetime of the recloser and it requires only a small contact stroke and low interruption energy. it is suitable for application of magnetic actuator mechanism and also vacuum interrupter has a capability of a large number of operations, which is ideal for the recloser’s application. Thus, vacuum interrupter with magnetic actuator provides a high reliability in operation and minimum maintenance if the replacement of the vacuum interrupter is required with any reasons, please consult with manufacturer.

Moving busbar

Fixed busbar

Vacuum interrupter

Opening spring

Figure 3-1. Recloser Interrupter

3.2. MAGNETIC ACTUATOR The magnetic actuator designed by the newest technology delivers force to the interrupter. Since the magnetic actuator consumes low energy, actuator switching operation can be simply achieved through rectifying circuit with the low voltage AC 110 or 220V supplied from an external power sources and battery charged with the low voltage sources.

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The permanent magnetic actuator mechanism has just one moving part. Thus the dramatic reduction in part gives a corresponding increase in reliability. Especially, as the actuator uses magnetic latching and uses trip and close coil separately, the actuator consists of the fewest components and can provides zero-maintenance operation.

The actuator driving arm is made of high strength aluminum alloy and delivers force to the interrupter. When pulse current flows into the close coil, the plunger of magnetic actuator is moved by the induced magnetic force to drive the interrupter to close position, and the actuator is then held in the closed position. In contrast, when pulse current flows into the trip coil, the plunger is released from the magnetic latch and the interrupter is moved to trip position.

Figure 3-2. The principles of magnetic actuator operation

3.3. BUSHING Bushing is mounted on the top of the recloser tank and supplied with either porcelain or polymeric bushing(EPR or Silicone rubber) depending upon user’s requirements. The ring core CT is mounted on the lower part of bushing inside of the recloser tank arranged at the fixed position of interrupter and senses the current flow. This current information is transmitted to the micro-processor based relay via the multi-core cable. Capacitor voltage divider (CVD) is available in case of using polymeric bushing to measure and sense the secondary voltage for signaling use.

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3.4. MANUAL TRIP /LOCKING DEVICE During control circuit faults or line repair, users can locally trip or lock the Recloser with the manual Trip/Locking device positioned on the front side of main tank. It can be manually operated by COS hot stick. If Trip/Locking device lever is in lock position, the Recloser can't be operated by local/remote control due to actuator power-off. In this lock position, the user should push the manual Trip/Locking device up to the trip position to release the locking status of the recloser and then the recloser can be operated by local or remote control. The recloser can be opened manually by using a hot stick to pull down the manual trip handle and the recloser with further pulling down can be locked.

Manual trip & Locking device LOCK TRIP

Hot stick

Figure 3-3. Manual Trip/Locking device of the recloser

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3.5. SF6 GAS 3.5.1. General The high purity SF6 gas filled with 0.5bar gauge keeps the insulation of the equipment and prevent corrosion of the main tank components.

3.5.2. Specification of Sulp hur Hexa Fluor ide Gas (SF6) Table 3-1. Specification Determination

Specification

Unit

Analysis

Purity

> 99.9

% wt

> 99.9

CF4

≤ 0.05

% wt

< 0.03

Air

≤ 0.05

% wt

< 0.03

Water

≤ 50

Vppm

< 50

Acidity as HF

≤ 0.3

mg/kg

< 0.3

Hydrolye, fluor

≤1

mg/kg

<1

Table 3-2. Physical properties Sublimation point (1.0133 bar)

-63.9℃

Melting point (2.26 bar)

-50.8℃

Vapour pressure (20 ℃)

21.08 bar

Critical temperature

45.55℃

Critical pressure

37.59 bar

Critical density

0.74 kg/l

Gas density (20℃, 1bar)

6.07 g/l

Liquid density (0 ℃, 12.65 bar)

1.56 kg/l

Acoustic velocity in SF6

129.06 m/sec.

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3.5.3. SF6 gas pr essure-Temperature Cur ve

Safty device operatin g pressure

Al a m press ure ( 0. 2kg/ c m G)

Nor mal filling pressure (0.5kg/cm G at25 C)

Figure 3-4. SF6 gas pressure -Temperature curve

3.6. MOLECULAR SIEVE The molecular sieve to be used is type 13X and other designations must not be used in SF6 gas. The 13X has a controlled pore size of about 9 angstrom (0.9 ㎜) as typical chemical Na 2O, A ℓ2O3, 2.5SiO2, nH2O. A polyester bag containing molecular sieve beads is placed inside the enclosure and the control cubicle. Molecular sieve 13X is commonly used for the concurrent removal of H 2O and CO2 from gas, air streams and removal of H 2S. Molecular sieve 13X can be regenerated by evacuating or purging, usually at elevated temperatures ranging from 200 ℃ to 300℃. Higher temperature may cause physical degradation of the molecular sieve structure.

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Typical properties shows as follows; Table 3-3. Typical properties Typical properties

Nominal pore diameter

9 angstrom(0.9㎜)

Type of crystal structure

hexagonal

Bulk density

680g/ℓ

Water content(as shipped)

1.5% wt (max)

Heat of absorption(max)

4200kj/kg·water 2.5∼5㎜, 2∼3㎜, 1∼2㎜

Bead size(nominal)

4×8mesh, 8×12mesh, 10∼18mesh

3.7. BATTERY AND BATTERY CHARGER The battery for operating the Recloser’s components and control circuit is placed in the lower part of the control cubicle and can be easily replaced. The battery life is usually 5 years, but it can be shortened depending on how it is handled. The fully charged battery is enough for 30 hours operation without an external power source.

Battery specification shows as follows; Table 3-4. Battery Specification Battery Specification

Battery Type

ES18-12

Nominal Voltage

12V

Nominal Capacity

18 amp-hours

Battery Dimension

181 ×76 ×167mm

Self-discharge Versus Time

+20℃ 3%/month, +40 ℃ 10%/month

Service life Time

Max. 5 years at +20 ℃

Battery Connector(CN11)

Molex Connector 3191-2R

Battery Charger

Charge Voltage

27.5Vdc(±0.5V)

Charge Current

Max 300mA

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3.8. CONTROL CUBICLE The Recloser control cubicle is designed for outdoor pole mounted and substation operation which is made of anti-corrosion stainless steel. The door is locked with three position locking devise and sealed with replaceable urethane foaming packing. All vents are screened against vermin entry and the cubicle inside is fully covered with adiabatic faming material which protects the inside components from the rapid temperature variation. The control cubicle outside is protected with a sunshine shield cover which is required for keeping the life cycle from shortening because the temperature sensitive electronic components and battery is affected by sunshine heating. The microprocessor based control compartment is completely sealed against water entry even though the hatch door is opened in the rain during the recloser operation. The condensation of the cubicle inside can be expected to foam due to the temperature variation under the atmospheric conditions such as tropical and moderate climate, however, any condensation does not affect any electronic components arranged with fully insulated sealed and well vented design.

Figure 3-5. Control cubicle layout

Consequently, any condensation on metal surface will run out of the bottom and automatically dried without affecting the electronic modules by ventilation and self heating. The standard control cubicle contains the relay, batteries for control power and mechanism driving power.

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The control cubicle must not installed outdoors without the sunshine shield cover in the places of solar heating. Detailed control and relay, Please refer to our separate EVRC2A manual. The control cubicle is shown in Figure 3-5 on previous page.

3.9. AUXILIARY POWER SUP PLY Auxiliary power source is derived from either of the following; y

From an external power source of 110V and 220V supplied by auxiliary power trans former.

y

From low voltage supply connected to the utility distribution line.

y

In addition to above, it is preferred to use from an external DC 110V supply for substation application as option.

Actually, auxiliary supply is used to operate the auto recloser through rectifying circuit and maintain charge on the sealed lead-acid batteries. The operation of recloser is fulfilled with the auxiliary power supply through the rectifying circuit regardless of charging of the sealed lead-acid batteries. The battery is used for the back-up operation of the recloser when auxiliary power supply is lost. The battery for operating the recloser is placed in the lower part of the control cubicle and arranged to be easily replaced. The battery life is predicted to use for 5 years service as recommended by the battery manufacturer’s data, but it can be shortened for its life on how it is handled and fitted with the environments. The battery is enough to operating the recloser for 30hours and over 500 events without external power supply. When the batteries are nearly exhausted in showing below DC 15V when battery is tested with load, please replace the batteries with new one as indicated in section 3.7 battery specification or consult with manufacturer.

CAUTION: Auxiliary Power Transformer shall be installed in the source side of user system.

External Power of EVRC2A Control shall be supplied from Source side in order to perform a normal sequence in case that a fault line occurs. When the recloser trips, the external power of EVRC2A Control shall not be lost.

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110V OR 220V 500VA Epoxy Mold Transformer

EARTH TERMINAL MOUNTING BRACKET

EARTH CABLE

CONTROL CABLE

THE DIGITAL CONTROL CUBICLE OF RECLOSER

Figure 3-6. Auxiliary power supply

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AUX. TRANSFORMER

EARTH TERMINAL 110V OR 220V 5KVA Tr. or LOW VOLTAGE SOURCE SUPPLIED BY UTILITYE

MOUNTING BRACKET

EARTH CABLE

CONTROL CABLE


Figure 3-7. Auxiliary power supply

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3.10. GAS FILLING VALVE This valve is on the side of the recloser tank and “CARE” must be paid, not to be opened with protection cap for preventing the gas leakage on the filling value. SF6 gas filling valve detail is shown in Figure 3-8.

Figure 3-8. Gas Filling Valve

3.11. ACCESSORIES 1) ON/OFF indication is located on the bottom inside of the main tank to be seen transparently from the underneath of the tank. 2) Operating counter is provided in the control cubicle and if fitted, available at the bottom of the main tank. 3) SF6 gas pressure sensor is available, if required as option. 4) Pressure rupture device is mounted on the side of recloser tank for protection of overpressure due to overheating of internal arc.

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4. PACKING, HANDLING AND STORAGE 4.1. PACKING AND DESPATCH Each recloser is normally packed in one non returnable case or wooden crate for exporting and in home is mounted on a transit pallet. The recloser is despatched in the closed position for convenience and filled with SF6 gas to the commissioning pressure before despatch.

The recloser and control cubicle are disconnected with umbilical cable connection for transportation and standard pole mounting bracket of the main Tank are despatched as loose equipment in the wooden crate of the recloser.

Table 4-1. Approximate weights Unit

15kV

27kV

38kV

Circuit breaker with gas

kgf

160

170

210

Control Cubicle with battery

kgf

80

80

85

Control cable

kgf

3.5

3.5

3.5

Mounting bracket

kgf

38

38

42

Gross weight in packing

kgf

320

330

380

4.2. UNPACKING AND HANDLING The wooden crate should be transported by hand pallet or forklift truck. The lifting procedures should be kept for safety and we recommend slinging as shown in Figure 41 and ensure the following procedures.

1) The slings should be approved and in good condition. 2) The lifting hook should be placed above the level of the bushings. 3) When moving the unpacked units, please maintain the lifting level to 30 ㎝ above ground level, if possible, to avoid the damage due to unexpected failure. 4) 4Please be sure to balance the main tank weight so that the rope does not touch both sides of bushings throughout the transportation. 5) When moving and lifting, special care should be taken not to damage the bushings and bushing terminals.

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6) Lifting method is shown in Figure 4-1.

m m 0 0 1 . n i M

Figure 4-1. Lifting configuration of the reclsoer

CAUTION: Do not touch severely Bushing or Bushing Terminal during transporting the main

tank of recloser. It causes a leakage of SF6 gas or damage on the bushing which leads to a severe malfunctions of the recloser.

4.3. RECEIVING A packing list will be attached to the packing case or recloser if not packed. On receipt, the recloser should be checked for the contents of deficiency or damage during transportation. Please inform within 3 days to either the carriers, supplying agent or customer services department of the ENTEC Electric & Electronic Company., Ltd., if any damage was found.

4.4. STORAGE As the recloser is designed for outdoor use, it can be stored both outdoor and indoor but the recloser should not be stored in a wet place and should not stacked up doubled.

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5. INSTALLATION 5.1. INSP ECTION BEFORE INSTALLATION 5.1.1. General Upon receipt of the recloser, a visual inspection for damage during transportation should be paid for the followings. 1) Circuit breaker - Bushings - Bulkhead fitting and connectors - ON/OFF indicator window - Lifting bracket - Trip and lockout lever 2) Mounting bracket 3) Control cubicle - Door - Door seal/ Door handle - Control and relay on the front panel - LED normal - LCD normal 4) SF6 gas pressure - Normal: 0.5bar.g at 20 ℃ - Lower limit: 0.2bar.g at 20 ℃

CAUTION:

If Gas low lamp is on, stop installing immediately and consult with the manufacturer.

5.2. TESTING 5.2.1. Gas pressure The unit (Recloser) is filled with SF6 gas pressure at least 0.5bar gauge at 20 ℃. If the pressure within the unit falls below 0.2bar gauge at 20 ℃, the following procedures should be taken.

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1) If the gas pressure is above 0.1bar gauge, the filling of SF6 gas should be done directly with attaching the gas handling equipment and fill upto the required pressure. 2) If the gas pressure is below 0.1bar gauge, a vacuum must be drawn out of the tank before filling SF6 gas. Draw a vacuum of 10mbar, hold this vacuum for 15 min and fill upto the required pressure (0.5bar gauge at 20℃). The unit is capable of keeping basic impulse level with an SF6 gas rich environment at zero bar gauge.

5.2.2. Battery check Please press battery load test button in the control cubicle, battery voltage is displayed on LCD panel. 1) Normal voltage: over 21V 2) Over discharged voltage: 15V~21V 3) Require to replacement: below 15V If battery voltage shows below 15V, the battery should be replaced with new one.

5.2.3. Contact lif e of vacuu m in terrup ter The life of the vacuum interrupter is dependent upon the accumulation of the number of faults interrupted and the magnitude of fault current. Consequently, it is very important to record the short circuit operations. If 10,000 operations have been exceeded or the LCD displayed in the control cubicle is indicated below 20%, the vacuum interrupters may need to be replaced. If the replacement of the vacuum interrupter is required, please consult with the manufacturer at any time.

5.2.4. Resistance test on cur rent carryi ng main c irc uit Ensure that the recloser is in the closed position. The electrical resistance of each phases should be determined by measuring voltage drop with a DC current of 100 Amperes passing through. The resistance measurement of any phases should not be exceeded over 20% compared with the recommended value from the manufacturer.

5.2.5. High vol tage insulatio n t est The recloser has been routine tested at the works in accordance with ANSI C37.60, 1981. It is recommended that the 50/60 ㎐ high voltage test should be carried out prior to energizing the recloser for the first time.

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One minute dry withstand voltage supply should be applied across each phase of the open position and between each phase and earth in the closed position of the recloser. The recommended site test voltage is 75% of the factory test voltage.

5.2.6. Operation t est The umbilical cable with plug-in connector should be connected between the recloser tank and control cubicle. All switches involved should be activated by powered-up control cubicle. Local mode on the front panel should be selected and then the recloser can be operated by using the open and close push buttons. If the battery is discharged, low voltage supply can be connected for charging the battery.

5.2.7. Secondary c urr ent inj ection test If required, please perform secondary current injection as using recloser test kit.

5.3. INSTALLATION 5.3.1-1. Standard po le moun tin g o f r ecloser tank. Unpack the wooden crate and clean the bushing please check and confirm that all items are included. The pole mounting bracket should be assembled with the tank and hanger band is mounted on the pole and should be fixed tightly with bolts between the hanger band and the supporting bracket on the recloser as shown in Figure 3-7. Before lifting the recloser onto the pole, care should be taken to ensure that supporting bracket is correctly mounted with the tank and upper hanger band is mounted on the pole firstly and lower hanger band is mounted consequently. The range of possible attachment diameter of the hanger band for the pole mounting is 200m/m to 300m/m and other diameter is optional. The recloser should be lifted as shown in Figure 4-1 and the slinging procedure, Please refer to section 4.2 to avoid tilting of the recloser. The additional rope may be used to assist for lifting and mounting of the recloser.

All standard pole mounting bracket and hanger bands with bolts and nuts are provided in the standard package.

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CAUTION: If the manual trip lever is pulled approximately 45 degrees, the recloser will trip and

may either be returned to the horizontal for normal operation. If the Trip lever is pulled to the latched position(locking), without releasing the trip lever to normal, no close operation occurs.

Figure 5-1. Mounting Bracket and Hanger Band

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0 0 6

. x a m 0 0 0 1

Control Cable

Pole Mounting Bracket Hanger Band

Earth Cable

Cable Cleats

Control Cubicle

Manual trip & locking device

Figure 5-2. Pole Mounting Detail

CAUTION: In Installation of recloser, Source Side of user system and recloser Source Side shall

be matched in order to have a precise metering. A, B, C are indicated for Source Side in Recloser and R, S, T are indicated in Load Side

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5.3.1-2. Subs tation moun ting frame If required, substation mounting frame can be supplied together with the recloser. Please assemble the mounting frame and adjust the height of mounting the recloser. Fasten tightly the recloser to the mounting frame with enclosed M16 bolts and nuts.

H.V Terminal

e l b a t s u j d A 0 0 9 2 0 0 6 2

Anchor bolts dimension M16 Anchor bolts

Figure 5-3. Substation mounting frame

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5.3.1-3. Surge Ar rester moun tin g frame Mounting brackets are supplied for Surge Arrester on the recloser tank, if required.

LOCK TRIP

TOP VIEW

Figure 5-4. Surge Arrester mounting frame

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5.3.2. Cont rol cub icle The control cubicle should be lifted using the mounting bracket and mounted with similarities using the procedure for the tank. When the control cubicle and the tank is mounted to the pole securely, then the umbilical cable plug may be connected as shown in Figure 5-2 and Figure 5-3.

Figure 5-5. Control cubicle mounting detail

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The total length of the inter-connecting multi-core cable would be 6 meters as standard and the longer cable is available upon request by client as option. The fixing arrangement multi-core cable should be tightened by using tie band with every 1000 ㎜ length against wind-waving. To prevent pulling weight, loosen slighty the control cable between the cable connector and the nearest hanger band.

5.3.3. Earthing Figure 5-6 shows the earthing common to the recloser tank and the control cubicle. To avoid the potential gradient differential among tank, control cubicle and surge arrester, Earthing path should be common and do not ground by a different path to all equipments and be sure to keep the ground cables away from the control cable by the maximum spacing available. The earthing conductor size should be at least 60 ㎟

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AUX. TRANSFORMER RECLOSER

EARTH TERMINAL

EARTH TERMINAL

EARTH CABLE

CONTROL CABLE


EARTH TERMINAL EARTH TEE OFF

Figure 5-6. Earthing layout

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5.3.4. High voltage co nnectio n Before installation, all terminals and connectors should be cleaned and prepared to be able to keep low resistance connection. Please refer to bushing assembly drawings shown in Figure 5-7.

Porcelain Bushi ng The high voltage bare conductor should be placed in the hole of the universal clamp and fastened with nut upto tensile torque of 400kg-cm.

Polymer Bushing For the polymer mold type of bushing, the stud clamp type made of anti-corrosive bronze is placed on the top of bushing. Insert HV cable directly into the center of stud clamps placed on the top of polymer bushing, and fasten four joint bolts evenly with tensile torque of 150kg-cm.

5.3.5 Bushing Depending on request, Bushing of Recloser is made of either porcelain or polymer. Bushing and bushing housing is completely assembled and tested at the factory before dispatching. Simply users connect the high voltage cable onto High Voltage Terminal at the top of Bushing.

Porcelain Bushi ng Table 5-1. Porcelain Bushing Type

Creepage distance

Arcing distance

Terminal type

Applicable cable size

Rating (Amps)

EVR 1

440 m/m

220m/m

Universal clamp

24 m/m (diameter)

630

EVR 2

750 m/m

300 m/m

Universal clamp

24 m/m (diameter)

630

Polymer Bushing Type of Bushing is Separable connector type standardized by IEEE 386, the material of Insulation Housing can be made of either E.P.D.M or Silicone. Table 5-2. Polymer Bushing Creepage Type

Arcing Distance

Applicable

Rating

Housing

cable size

(Amps)

Material

Terminal type

distance

EVR1

520 m/m

220 m/m

STUD clamp

25 m/m(Max.dia.)

630

EPDM/Silicone

EVR2

860 m/m

330 m/m

STUD clamp

25 m/m(Max.dia.)

630

EPDM/Silicone

EVR3

1100 m/m

400 m/m

STUD clamp

30 m/m(Max.dia.)

800

EPDM/Silicone

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P O R C E L A I N B U S H I N G

P O L Y M E R B U S H I N G

Figure 5-7. Bushing assembly

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6. RECLOSER OPERATION 6.1. GENERAL The recloser with the microprocessor-based digital control technology is designed to provide automatic distribution reclosing system for maximum continuity of electric service, please refer to EVRC2A manual in details.

6.2. OPERATION PROCEDURE 1) Ensure that all programmable settings of the relays meet the user's requirements. 2) The detailed information for relay and control, Please refer to separate operation and maintenance instructions for EVRC2A. 3) Check that the recloser is properly installed and all electrical connections are made and it is filled with SF6 gas to at least the normal service pressure 0.5 bar.g at 20 ℃. 4) Check that any external wiring connections for control are placed in normal. 5) If the recloser does not close with electrical operation, push the manual trip lever up to reset from the lockout to the trip position. 6) If you intend to trip manually, pull the trip lever down and check whether

the position

indicator points off position or not. 7) If you intend to lock the recloser, then pull the manual trip lever down to the lockout position and then trip lever indicates at lockout position. If you intend to “close” electrically when the manual lever is positioned at the lockout position, the recloser remains "open" as closing power is removed. Consequently, you should return the manual trip lever to the trip position for normal operation.

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7. MAINTENANCE 7.1. GENERAL 1) The recloser has been designed as a low maintenance unit and using

single moving part as

adopting magnetic actuator mechanism does not require major maintenance like overhaul. 2) The control and relay maintenance, please refer to operation and maintenance instructions for EVRC2A. 3) Each equipment maintenance for recloser, please refer to section 3 and 4. 4) A general inspection of the recloser should be made giving attention for clean and normal condition of each equipment.

7.2. DISMOUNTING OF RECLOSER 1) Ensure that the HV system is grounded for safety. 2) Dismantle high voltage connections and prepare the slinging wire to lift recloser. 3) Before the lifting of the recloser on the pole, with the lifting arm fitted and maintain to support the weight of the recloser with the lifting arm engaged. 4) Remove the multi-core connectors on the recloser. 5) Dismantle the lower hanger band fixing bolts and consequently the upper hanger band fixing bolts. 6) Lift the recloser and move to the ground level. 7) Dismantle the control cubicle mounting bolts. 8) Lift the control cubicle and move onto the ground level.

7.3. CONTACT LIFE OF VACUUM INTERRUP TER The life of the vacuum interrupter is normally over 20 years or 30,000 reclosing operations with light load operations stating by manufacturer. However, it can vary depending on the magnitude of fault currents and number of reclosing operations under loaded condition. The remaining life of the vacuum interrupter is displayed on LCD with percentage of wear-out at contact point based on calculating from magnitude of fault currents and number of trip operations. The vacuum interrupter is recommended to replace if the remaining life becomes lower than 20%. Be sure to consult with the manufacturer for replacement in details.

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Actually since most faults are considerably lower than the maximum fault current and number of faults are considerably fewer than the guaranteed number of faults. The service life is expected to be much longer than the contact life of vacuum interrupter calculated by the amount of contact wear. Thus it keeps the operation of recloser to be satisfactory.

The data of the anticipated contact life and mechanical operation shows as follows;

Table 7-1. Contact life of vacuum interrupter Model

Mechanical operations

EVR 1

Contact life Rated load

Maximum fault current

10,000

10,000

100

EVR 2

10,000

10,000

100

EVR 3

10,000

10,000

100

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7.4. SF6 GAS REFILLING 7.4.1. General The recloser is filled with SF6 gas 0.5bar gauge pressure at 20 ℃. When the pressure of SF6 gas in the recloser tank is below 0.2bar gauge at 20 ℃, the instruction of refilling SF6 gas is as follows.

7.4.2. Refillin g pro cedure 1) Connect SF6 gas tank to gas-filling valve on the side of recloser tank as shown in Figure 7-1 below. The gas-filling valve matches with DILO pressure coupling VK/F-02/8. 2) Measure the gas pressure in recloser tank. 3) When the gas pressure is above 0.1bar gauge, refilling SF6 gas work should be proceeded by attaching the gas filling equipment and filling the SF6 gas to 0.5bar gauge pressure. 4) When the gas pressure is below 0.1bar gauge, a vacuum must be drawn from the recloser tank before filling SF6 gas. Draw the vacuum of 10mbar and hold this vacuum condition for 15 min and refill the recloser tank with SF6 gas to 0.5bar gauge pressure at 20‘C

Figure 7-1. SF6 gas refilling configuration

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Table. Replaceable spare parts (1/2) Part

Supplier / Description

Part No.

Epoxy Bushing

ENTEC

EVR-SP0001

Epoxy Bushing clamp

ENTEC

EVR-SP0002

Clamp Packing

ENTEC

EVR-SP0003

Insulation Housing 500m/m (EPDM)

ENTEC / 15kV

EVR-SP0004

Insulation Housing 500 m/m (Silicon)

ENTEC / 15kV

EVR-SP0005

Insulation Housing 860 m/m (EPDM)

ENTEC / 27kV

EVR-SP0006

Insulation Housing 860 m/m (Silicon)

ENTEC / 27kV

EVR-SP0007

Magnetic Counter

ENTEC

EVR-SP0008

High Voltage terminal (universal type)

ENTEC

EVR-SP0009

High Voltage terminal (STUD type)

ENTEC

EVR-SP0010

Gas filling valve O-ring

N.O.K / P12.5(EPDM)

EVR-SP0011-1

Bushing seal O-ring

N.O.K / P85(EPDM)

EVR-SP0011-2

Gas filling valve cap

ENTEC

EVR-SP0012

Silicone grease for H.V Insulation

ENTEC

EVR-SP0013

Silicone grease for O-ring

Shinetsu / HiVac-G

EVR-SP0014

Water proof packing for control cubicle

ENTEC

EVR-SP0015

Control cable with receptacle (37PIN)

ENTEC

EVR-SP0016

External power cable

ENTEC

EVR-SP0017

Control cubicle

ENTEC

EVR-SP0018

Mount Accessory Small

ENTEC

EVR-SP0019

Mount Accessory Large

ENTEC

EVR-SP0020

Battery

Sealed lead–acid Battery (Two 12V18Ah)

EVR-SP0021

Heater/40W

ENTEC

EVR-SP0022

NFB

Korea(LG) / BS31a(20A)

EVR-SP0023

Magnetic Contactor

Schneider-electric / LC1K0910E7

EVR-SP0024

Terminal Block and Fuse Holder

ENTEC

EVR-SP0025

Relay Module-CVD Type

ENTEC

EVR-SP0026

Relay Module-VT Type

ENTEC

EVR-SP0027

UPS Module

ENTEC

EVR-SP0028

Capacitor Communication Cable (CC201)

Korea(Samyoung) / SMS 22000uF/160WV ENTEC

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02 20020100 V1.10 EVRC2A Manual Circuit Breaker

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