SF6 GAS INSULATED LOAD BREAK SWITCHnbaco.com/dw/SF6GASLBS Manual.pdf · The SF6 GAS INSULATED LOAD...

ENTECELECTRIC & ELECTRONIC CO., LTD

ENTEC

SF6 GAS INSULATED

LOAD BREAK SWITCH USER’S MANUAL

2009.04

SF6 GAS INSULATED LOAD BREAK SWITCH 1. DESCRIPTION

3ENHANCED TECHNOLOGY

TABLE OF CONTENTS

1. DESCRIPTION ............................................................................................................... 4

2. RATINGS & SPECIFICATION .................................................................................... 5

3. FEATURES ...................................................................................................................... 6

4. DESIGN & CONSTRUCTION ...................................................................................... 9

5. SWITCH OPERATION ................................................................................................ 14

6. CHECK & REVIEW FOR OPERATION .................................................................. 15

7. INSTALLATION ........................................................................................................... 16

8. CONNECTION .............................................................................................................. 18

9. WIRING DIAGRAM .................................................................................................... 20

Table of Contents http://www.entecene.co.kr

4 ENHANCED TECHNOLOGY

1. DESCRIPTION The SF6 GAS INSULATED LOAD BREAK SWITCH is designed to meet the demand of oil less, maintenance free operation and distribution system which typically require a significant increase in the number of load break operation. The ENTEC ETG SWITCHES filled with SF6 gas for the insulation and the arc quenching medium and combined with unique puffer technic, it ensures the safe & long life of load current switching. The independent mechanism of the basic quick make and quick break is very simple and reliable. The mechanism is installed inside of no corrosion tank with SF6 gas, and maintenance free operation is achieved.

SF6 GAS INSULATED LOAD BREAK SWITCH 3. FEATURES


2. RATINGS & SPECIFICATION

Table 2-1. Ratings & Specification

TYPE ETG – 15(12)kV ETG - 27kV

RATINGS

Maximum System Voltage kV 12 27

Current A 630 400 / 630

Frequency Hz 50 / 60 50 / 60

Fault Make Capacity (rms) kA/sec 20/4 12.5/1 or 16/1

Fault Make Capacity (peak) kA 50 32.5

BREAKING CAPACITY

Mainly Active Load Current(0.7PF) A 630 400 / 630

Loop Current A 630 400 / 630

Number of Switching’s times 10 200

Cable Charging Current A 10 25

Transformer Magnetizing Current A - 22

BASIC INSULATION LEVEL 1.2×50(㎲)

Phase to Earth kV 75 150

Across Interrupter kV 85 150

On Loss of SF6 GAS kV 75 150

POWER FREQUENCY INSULATION LEVEL (1min)

Phase to Earth kV 42 60

Across Interrupter kV 49 60

ENVIRONMENTAL

Ambient Temperature ℃ -25 ~ +70 -25 ~ +70

Humidity % 0 ~ 100 0 ~ 100

Altitude (max.) m 1,000 1,000

OPERATING PERFORMANCE

Close/Open DC Voltage Vdc 24 24

Close/Open Time sec < 1 < 1

Mechanical Operations times 3,000 5,000

Nominal Gas Pressure kg.f/㎠.G 0.7 1.7

Safety device Bursting Pressure kg.f/㎠.G 3 ~ 5 4 ~ 6

Locking device Operating Pressure kg.f/㎠.G 0.2 ~ 0.4 0.5 ~ 0.9

APPROX weight 110kg 180kg

* 3 Position switch is only available to 15kV SF6 Gas Insulated LBS.

3. FEATURES http://www.entecene.co.kr


3. FEATURES The remote controlled switch offers the following;

1) SF6 gas insulation & interruption 2) Tig welded stainless steel tank and double sealing with EPDM O-Ring and gasket, ensures

the seal performance for life time. 3) The basic mechanism is operator independent quick close and quick open spring toggle

mechanism. 4) Easy installation due to reduced dimension 5) At the atmospheric gas pressure, it ensures the rated insulation, Interruption ratings. 6) Safety feature

Low-pressure safety locking (both manually and electrically) device. Over-pressure releasing device

7) Puffer principle designed for minimum 200 load breaks and 5,000 mechanical operations. 8) Switch power supply for 24Vdc motor operation to sustain operation in the event of loss of

AC power source (110Vac or 220Vac) 9) Three CT and six capacitive voltage sensors can be integrated. 10) Porcelain Bushing and Silicon Bushing are available as customer requested.

SF6 GAS INSULATED LOAD BREAK SWITCH 3. FEATURES


Figure 3-1. Switch Lay-Out(2 position)

Table 3-1. Dimension (mm)

Rated Voltage 15kV 27kV

A 1040 1265

B 210 250

C 820 900

D 525 525

3. FEATURES http://www.entecene.co.kr


Figure 3-2. Switch Lay-Out(3 position)

Table 3-2. Dimension (mm)

Rated Voltage 15kV 27kV

A 1062 1407

B 210 204.5

C 892 900

D 525 524

SF6 GAS INSULATED LOAD BREAK SWITCH 4. DESIGN & CONSTRUCTION


4. DESIGN & CONSTRUCTION

1) Tank(case) The tank is made of low carbon stainless steel to prevent the corrosion because of

welding. It is designed for maximum strength and minimum welding line.

At the maximum bursting pressure of 6㎏.f/㎠.G, the operation is not affected. 2) Low pressure locking device

If this device is operated, the switch maintain its present close/open position. The snap acted SUS diaphram pressure sensor, sense the low gas and activate the low

pressure locking device, then low pressure warning target is operated and electrical/mechanical operation is interlocked.

< Normal Status >

< Low Pressure Status >

Figure 4-1. Low Pressure Lock Device(2 position)

4. DESIGN & CONSTRUCTION http://www.entecene.co.kr


< Normal Status >

< Low Pressure Status >

Figure 4-2. Low Pressure Lock Device(3 position)

3) Over pressure safety device

The switch shall be provided with over pressure safety device to prevent raising pressure over 6㎏.f/㎠.G.

Operating pressure of the over pressure safety device is 4 ~ 6㎏.f/㎠.G 4) Manual locking device (optional)

This device is located at manual operating handle side. When it is pulled down, then it is toggled acted, and maintain the position, interlock

mechanically the close/open operation, and gives the dry contact to the control.



Figure 4-3. Manual Locking Device(2 position)

Figure 4-4. Manual Locking Device(3 position)

5) Arc-quenching device Switches filled with SF6 gas for the insulation and the arc quenching medium with

puffer principle in make and break, ensure the positive breaking of small inductive, mainly active load current, cable charging current, etc.

< Normal Position > < Lock Position >

< Normal Position > < Lock Position >

4. DESIGN & CONSTRUCTION http://www.entecene.co.kr


6) Interrupting parts

The switch uses the puffing technics and arcing time is just half cycles. Because of extremely short arc time, the arc by products are negligible, even after duty test.

The interrupting, insulation performances are guaranteed at atmospheric pressure. 7) Mechanism and operating handle

The very simple, reliable mechanism makes it possible to install the mechanism inside the SF6 tank for actual maintenance free operation.

The simple torsion spring mechanism ensures operator independent quick close, open and quick earth operation.

8) Position Indication Position Indicators are connected to the switch operating shaft. It is provide clear and

exact switch position Indication.

< Earth > < Open > < Close > Figure 4-5. 3-Position Switch

< Open > < Close > Figure 4-6. 2-Position Switch



9) Bushings The bushing shall be made of high quality porcelain or Silicon rubber as customers

requests, and be mounted horizontally to the tank. 10) Painting

The tank shall be applied standard protection against corrosion. The finishing coat shall be gray (Munsell No.5Y 7/1) or as customer requested.

5. SWITCH OPERATION http://www.entecene.co.kr


5. SWITCH OPERATION ENTEC ETG is available as two positions switching(ON-OFF) or three positions switching(ON-OFF-EARTH)

1) Manual operation of tow positions switch The switch is provide with an independent manual operating handle. By using Nema-head hook stick, pull down right(Red color)-side of handle to Open

switch or pull down left(Green color)-side of handle to Close switch.

< Close → Open > < Open → Close > Figure 5-1. 2-Position Switch Operation

2) Manual Operation of three positions switch Manual operation is performed by Manual operation handle in front side. On opening status, pull down right(Red color)-side of handle to Open switch or pull

down left(Green color)-side of handle to Close switch

< Open → Close > < Close → Open > < Open → Earth >

< One Side Earth >

Figure 5-2. 3-Position Switch Operation

SF6 GAS INSULATED LOAD BREAK SWITCH 5. SWITCH OPERATION


6. CHECK & REVIEW FOR OPERATION

1) To ensure the inside mechanism, perform several closing & opening operations manually and electrically.

2) During this operation, manual locking device should be in FREE position.

3) When carrying or lifting the switch, use its carrying handle, lifting lug and lifting holes.

Never use its porcelain or Silicon bushing, its lead wire, nor its manual operating handle when moving the switch

4) Lift the switch to the cross arm on the pole which is not supplied by us, with suitable

lifting ropes and fix the switch to the cross arm with hanger assembly provided at the top of the switch.

5) When carrying and lifting the switch, never damage the switch itself nor painting surface.

If any paint portion makes a scratch, re-paint with following weather-proof type paint-Munsel 5y 7/1.

6) Control box is provided with steel channel for mounting.

Mount the control cabinet with mounting gear, such as suitable bands or brackets.

7) The switch and control cabinet must be earthed by means of grounding terminal, which is solderless clamp type suitable for grounding conductor diameter of 9.0㎜

8. CONNECTION http://www.entecene.co.kr


7. INSTALLATION

Installation of the switch

1) The switch should be carried or lifted in the closed position. when carrying or lifting the switch, use its carrying handles, or lifting holes. Never use its porcelain bushings, its lead wires nor its manuals operating handle. These handling will cause the damage on the switch.

Figure 7-1. Installation of Switch

2) Lift the switch to the cross-arm which is not supplied by us, on the pole with suitable

lifting ropes, and fix the switch to the cross-arm with its hanger assembly provided at the top of the switch. The switch should be mounted horizontally as possible.

When mounting the switch to the cross-arm, the manual operating handle side of the switch should be mounted near the pole, this mounting direction will give you an easy manual operation with a NEMA-head hook stick.

SF6 GAS INSULATED LOAD BREAK SWITCH 8. CONNECTION


When tightening four nuts and washers for hunger bolts, apply correctly 2 hanger plates and 2 plate retainers to the hanger bolts and tighten four nuts washers impartially and firmly.

3) When carrying and lifting the switch, never damage the switch, never damage the switch

itself nor painting surface. If any paint portion makes a scratch, re-paint with the following weather-proof type paint:

- Synthetic resin enamel paint, Munsel Notation No. 5Y 1/7 (light gray)

4) After installing the switch, confirm the smooth movement of the inside mechanism of the switch by several closing and opening operations.

Figure 7-2. Source Side & Load Side

CAUTION: In Installation of switch, Source Side of user system and switch Source Side shall be matched for exact metering and Indication of control panel. A, B, C are indicated for Source Side in switch and R, S, T are indicated in Load Side



8. CONNECTION

1) Connection of main circuit Connect the terminal connectors to your HV lines with using Tee Tap connector, two

holes NEMA pad. 2) Connection for the control cables

Connect the switch and the control box with control cables. Refer to “Figure 8-1. ”. Fix control cables properly to the pole by suitable bands, and do not damage the

connecting portions. 3) Grounding connection

Connect the grounding wire which is not supplied by us, to the grounding terminal provided by the leg on the body of the switch. Grounding terminal accepts steel stranded wire.

Figure 8-1. One Pole Installation



Figure 8-2. Two Pole Installation



9. WIRING DIAGRAM

P1

14VB

12

11

10

15VA

P2

13P3

Protection Module

RS

(female)

Cubicle

52b

52a

52a : Close status(52a closed if switch open)

52b : Open status(52b closed if switch close)

69 : Switch lock(69 closed if switch lock)

M : Motor(DC24V max.I



52,PS,69 : 30Vdc/3A

M b

52Eb : 52Eb open if switch earth close

52Ea : 52Ea closed if switch earth

PS : Low Pressure(PS closed if low pressure)

52b : 52b closed if switch open

52a : 52a closed if switch close

69 : Switch lock(69 closed if switch lock)

M : Motor(DC24V Max.I

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