Delta 4000 Instruction Manual download pdf (Page 68)

81331 Rev 01 Nov 2010

Description of Tets

Circuit Breaker Overall Tests

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

Tests may be performed either with or without arc chutes installed. This should

be noted in the Comments field for future reference.

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.

Diagnostic Tests

These tests provide flexibility for performing more diagnostic tests in the event

that an area of concern presents itself. Each test line allows the operator to

choose between test modes UST-R and/or GST-GND. A detailed description of

the tests performed should be documented on the form, both in the

Specimen/Connection field and the form Comments field.

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