Delta 4000 Instruction Manual download pdf (Page 72)

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81331 Rev 01 Nov 2010

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Description of Tests

Circuit Breaker Overall Tests

Test 1 (C

1G

) - This is a measurement of the ground insulation on Pole 1 with the

circuit breaker in the open position. All other poles on the breaker will be

floating (no connection). The HV cable will be connected to the bushing top

terminal. No LV lead connection is required. The frame of the breaker must be

connected to station ground. Test mode is GST-GND.

Test 2 (C

2G

) - This is a measurement of the ground insulation on Pole 2 with the

circuit breaker in the open position. All other poles on the breaker will be

floating (no connection). The HV cable will be connected to the bushing top

terminal. No LV lead connection is required. The frame of the breaker must be

connected to station ground. Test mode is GST-GND.

Test 3 (C

3G

) - This is a measurement of the ground insulation on Pole 3 with the

circuit breaker in the open position. All other poles on the breaker will be

floating (no connection). The HV cable will be connected to the bushing top

terminal. No LV lead connection is required. The frame of the breaker must be

connected to station ground. Test mode is GST-GND.

Test 4 (C

4G

) - This is a measurement of the ground insulation on Pole 4 with the

circuit breaker in the open position. All other poles on the breaker will be

floating (no connection). The HV cable will be connected to the bushing top

terminal. No LV lead connection is required. The frame of the breaker must be

connected to station ground. Test mode is GST-GND.

Test 5 (C

5G

) - This is a measurement of the ground insulation on Pole 5 with the

circuit breaker in the open position. All other poles on the breaker will be

floating (no connection). The HV cable will be connected to the bushing top

terminal. No LV lead connection is required. The frame of the breaker must be

connected to station ground. Test mode is GST-GND.

Test 6 (C

6G

) - This is a measurement of the ground insulation on Pole 6 with the

circuit breaker in the open position. All other poles on the breaker will be

floating (no connection). The HV cable will be connected to the bushing top

terminal. No LV lead connection is required. The frame of the breaker must be

connected to station ground. Test mode is GST-GND.

Test 7 (C

12

) - This is a measurement of the insulation on Phase 1 (A) between

Pole 1 and Pole 2 with the circuit breaker in the open position. All other poles

on the breaker will be floating (no connection). The HV cable will be connected

to the bushing top terminal of either Pole 1 or 2. The LV Red lead is connected

to the other Pole. The frame of the breaker must be connected to station

ground. Test mode is UST-R.

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