Page 31 - Practical Power System and Protective Relays Commissioning

Introduction to Testing and Commissioning of Power System Chapter | 3 27

A gas leakage test for all joints by should be undertaken using gas detec-
tors or a plastic bag test around joints. Testing should include the operation
of gas density switch alarms and trip signals and lockout functions, and the
operation of CBs, DSs, ESs, and LCCs.

3.6.2 Electrical Tests

An electrical test can include any of the following:
1. Insulation resistance test for all wiring and cables.
2. Interlocking circuit test.
3. Busbar joints resistance tests at 100 Amp D.C.
4. Earth resistance at 100 Amp D.C.
5. Function checks of the LCC including bay control unit, interlocking,
alarms and interface circuits between the GIS and protection and control
circuits.
6. Circuit breaker tests, timing (close and open) DS (close and open)
including the special auxiliary contacts of DS used in busbar protection
scheme and a CB mechanism check.
7. VT and CT tests.
8. Heater checks in LCC especially in countries with cold weather.
9. High voltage test of GIS components include CBs and DSs, with VT
isolated and CT secondary circuited shorted as per international stan-
dard for 1 minute.
10. Partial discharge test measurements; refer to Chapter 14, Gas Insulated
System Substation.

3.7 HIGH VOLTAGE CABLES COMMISSIONING TESTS
3.7.1 Visual Checks
Checks should include assessing the tightness of connections using a torque
wrench tool.

3.7.2 Electrical Tests
An electrical test can include any of the following:
1. Phasing test.
2. HV test.
3. Insulation resistance test.

Refer to Chapter 6, Transmission Lines, for further details.