220kv GIS Maintenance and Operation (1)

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Training ELK-14252kV GIS

Contents

SF6 Properties

Advantages of GIS

ABB GIS Products

ELK-14

GIS Operation

GIS Maintenance

Sulphur hexafluoride SF6

The properties

Inert, non-toxic

Electro-negative (electron-capturing)

Six times heavier than air

Global Warming

SF6 as Quenching Medium

Ionization temperature of SF6 is lower than air

In SF6 the radial temperature gradient in the arc is very steep

Excellent arc quenching property Low arc diameter

Low arc temperature

Only very small gas blast needed

Radial temperature profile in electric arcs

SF6 as Insulating Medium

Pressurized at 300 kPa (3 bar) SF6 insulates better than oil

Pressurized at 400 kPa (4 bar) SF6 insulates 6 times better than air at normal pressure

In SF6 the GIS field configurations are homogenous

Ball-plate-arrangement, 50 Hz ac

12.5 mm ball, 12.5 mm distance

HV - GIS: The compact substation solution

Advantages:

Reduced Space System planning with high flexibility Best for novel, creative solutions More sites available Power distribution on HV level Reduced transmission losses Fully metal-enclosed, safe Prefabricated, factory-tested units Fast installation

ABB GIS product portfolio

Encapsulation

Reted voltage(kV)

Rated power frequency withstand voltage (kV)

Rated lighting impulse withstand voltage (kV)

Rated current (A)

Rated breaking current (kA)

Three-phase

170 550

325 740

750 1550

3150 4000

50 6340

145

275

650

2500

800

960

2100

5000

50

GIS-Type ELK-0 ELK-3ELK-04 ELK-4

300

460

1050

4000

63

ELK-14/300ELK-14/252

252

460

1050

3150

50

Three-phase Three-phase with single-phase

Single-phase Single-phase Single-phase

ABB GIS Focus Factories In Europe

ABB Factory “Hanau-Großauheim“Scope of activities:Development, Manufacturing, Engineering and Sales Support

Output:GIS up to 170kV

ABB Factory “Oerlikon-Zürich“Scope of activities:Development, Manufacturing, Engineering and Sales Support

Output:GIS from 170kVup to 550kV

Another ABB GIS Focus Factory In Xiamen, China

ABB Factory “Xiamen, China“( Founded In 1999 with current production of 1,000 bays / year.)

Scope of activities:Development, Manufacturing, Engineering and Sales Support

Output : GIS up to 550kV

ELK-14 / 252kV

CB & Operating Mechanism

Disconnector & Earthing Switch

CT & VT

Connecting Elements

Local Control Cubicle

Modules:

Circuit Breaker (50 kA)

ELK-14 CB Operating Mechanism - HMB4

ELK-14 CB Operating Mechanism - HMB4

Advantages of HMB-4Advantages of HMB-4

Long service life and high reliability

Less maintenance and minimum wear

Easy checking and inspection

Low noise level

No external piping, reduced chances of oil leak

Extremely compact design

Flexibility of use

In comparison with spiral springs: Disk springs have much higher mechanical

strength Higher energy storage density No ageing of mechanical characteristics

during service Flat F-S characteristic, more suitable for

switching operations of CB

Force

Stroke

Characteristic of spiral spring

Characteristic of disc spring

Energy

CB Mechanism HMB

Integrated Current Transformer

Voltage Transformer

Combined Disconnecting and Earthing Switch

Fast Acting Earthing Switch

Three pole operated (one drive) Most compact 3-phase design Spring remains uncharged after close-operation

Density Monitor

Functional diagram

SF6 Gas Monitoring

CB

Other Compartments

Filling Pressure

Alarm Pressure

Blocking Pressure

220 kV GIS Engro Energy Power Plant

D:\Pakistan Engro Qadirpur 220kV drawings\Primary drawing\01 Single line & Diagram\Single line & Diagram_1HZ0000004_B gas diagram (1).pdf

GIS Operation

Local inspection in GIS room

Alarm annunciation

Gas density monitor

LOGO

Hydraulic pump counter of CB drive

Counter of CB

Oil level in CB drive

Local Control Cubicle (LCC)

1. Alarm annunciator2. Local/Remote control3. LOGO 4. Interlocking/release switch5. Push button6. Position indicator

1

2

3

6

5

4

Alarm Annunciator

Interlocking/Release Switch

Using this switch to release the interlocking condition one must be very CAREFUL.

After energizing please put the Interlock/Release and Local/Remote control key in safe place by authorized person.

Manual operation of Disconnector and Earthing switch-ELK-14

Adjust position

Insert crank

1. Interlocking magnet in each DES

2. Crank opening

3. padlock

12 3

Manual operation of Fasting Earthing Switch

1. Padlock

2. Crank opening

3. Interlocking magnet

Manual operation of Disconnector and Earthing switch-ELK-14

Any question, Please see operation manual for more detail description.

ABB GIS maintenance plan

Daily inspection

First time after 1 year

Second time after 5 year

Third time after 8 year

Overhaul based on its health condition

Maintenance

Maintenance-first time

After one year’s operation

Gas pressure

Local Control Cabinet

Manual operation of DES,FES

Visual inspection of CB drives

Maintenance-second time

After 5 year

Check the gas pressure

Dew point testing

Local Control Cabinet

Remote control

Insulation of the secondary control cable

Manual operation of DES,FES

Visual inspection of mechanism

CB characteristic

Primary DC resistance

Maintenance-third time

After 8 year

Check the gas pressure Check the density monitor

Dew point testing

Local Control Cabinet

Remote control, check the remote signal and protection

Insulation of the secondary control cable

Manual operation of DES,FES

Visual inspection of mechanism

CB characteristic

Primary DC resistance

Check the earthing

High voltage testing optional

Overhaul

Overhaul is based on health condition of GIS

CB: Short circuit current(50KA) 10 times or normal operation more than 5000 times

Inner fault flashover abnormal voice

Gas leakage that can not be solved unless disassembly;

Other reasons

Finding and dealing with usual problems

1. Low SF6 pressure Low SF6 pressure alarm/density monitor

Report to ABB and fill SF6; Seek for leakage position Solved by ABB

2. Loss of hydraulic oil inside CB drive Oil level indicator (glass window).

Report to ABB Seek for leakage position Solved by ABB (if serious, maybe need power off)

3. OthersABB will provide professional support when you need

and Please contact with ABB as soon as possible

Gas Tightness and Moisture Test

Gas leak Seeker

Dew Point Test Instrument

SF6 Gas Refilling Device

1. VK/F-02/20 Coupling Tongue Part DN20

2. VK/F-02/8 Coupling Tongue Part DN8

Kind advice

For any maintenance work inside the enclosure of GIS, please contact ABB as all work should be under

ABB’s supervision

Power and Productivity for a better World