Delta 4000 Instruction Manual download pdf (Page 70)

81331 Rev 01 Nov 2010

Description of Tests

Circuit Breaker Overall Tests

Tests 1 to 6 are conducted with the circuit breaker in the open position. Tests 7

to 9 are conducted with the breaker in the closed position.

Tests 1 to 6 (C

, C

) - These are measurements of the

ground insulation of each pole of the breaker with the breaker in the open

position. Test 1 is indicated by Insulation Tested C

, Test 2 by Insulation

Tested C

, etc. The HV cable is connected to each pole, in turn, with all other

poles floating (no connection). The breaker frame must be connected to station

ground. Test mode is GST-GND.

Test 7 (C

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

and ground, and is indicated by Insulation Tested C

. This test is

performed with the breaker closed. The HV cable is attached to either Pole 1 or

Pole 2. All other breaker poles are left floating. Test mode is GST-GND.

Test 8 (C

) - This is a measurement of the insulation between Phase 2 (B)

and ground, and is indicated by Insulation Tested C

. This test is

performed with the breaker closed. The HV cable is attached to either Pole 3 or

Pole 4. All other breaker poles are left floating. Test mode is GST-GND.

Test 9 (C

) - This is a measurement of the insulation between Phase 3 (C)

and ground, and is indicated by Insulation Tested C

. This test is

performed with the breaker closed. The HV cable is attached to either Pole 5 or

Pole 6. All other breaker poles are left floating. Test mode is GST-GND.

Bushing and Oil Tests

Tests 10 to 15 - These are tests of the C1 insulation on the breaker bushings.

The HV lead is connected to each bushing top terminal, in turn, and the LV Red

lead is connected to the respective bushing test tap. Test mode is UST - MEAS

RED, GND BLUE. At the completion of each test, the HV and Red leads are

then moved to the next bushing to be tested.

Tests 16 to 21 - These are tests of the C2 insulation on the breaker bushings.

The LV Red lead is connected to each bushing top terminal, in turn, and the HV

lead is connected to the respective bushing test tap. Test mode is GSTg-R. At

the completion of each test, the HV and Red leads are then moved to the next

bushing to be tested.

CAUTION

Bushing test taps have very limited insulation and should

generally be energized at reduced voltage levels. If the

bushing or breaker manufacturer does not specify a test

voltage level use no more than 500 volts (0.5kV).

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Delta 4000 Instruction Manual Page 70

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