Delta 4000 Instruction Manual download pdf (Page 76)

81331 Rev 01 Nov 2010

Description of Tests

Circuit Breaker Overall Tests

Prior to the overall insulation tests, remove the breaker from its cubicle or cell, if

applicable.

The breaker will remain in the open position for all tests.

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 the poles on

Phase 1 or Phase A, and is indicated by Insulation Tested C

. The HV cable is

attached to Pole 1 and the LV Red lead is attached to Pole 2. All other breaker

poles are left floating. This test is performed with the breaker open. Test mode

is UST-R.

Test 8 (C

) - This is a measurement of the insulation between the poles on

Phase 2 or Phase B, and is indicated by Insulation Tested C

. The HV cable is

attached to Pole 3 and the LV Red lead is attached to Pole 4. All other breaker

poles are left floating. This test is performed with the breaker open. Test mode

is UST-R.

Test 9 (C

) - This is a measurement of the insulation between the poles on

Phase 3 or Phase C, and is indicated by Insulation Tested C

. The HV cable is

attached to Pole 5 and the LV Red lead is attached to Pole 6. All other breaker

poles are left floating. This test is performed with the breaker open. Test mode

is UST-R.

Bushing Tests

Most vacuum circuit breakers are not supplied with condenser bushings, except

for those rated above 15kV.

The table supplied may be used to measure the C1 insulation on condenser

bushings, if so equipped. For all tests, test mode is UST-R.

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Delta 4000 Instruction Manual Page 76