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6. Testing and Inspection
After equipment has been installed and all connections made,
it should be tested and inspected before energizing. Although
the devices have been tested at the factory, a final field test
should confirm that the equipment has been properly installed
and all connections are correct.
WARNING
!
The primary equipment should be completely
de-energized while the tests are in progress.
Directions for testing relays, instruments, and meters are
given in the instruction book furnished for each device. The
proper settings of the protective relays and circuit breaker
are normally determined from a complete power system
coordination study performed by the purchasers or their
consultant; therefore, the settings of these devices must be
made by the purchaser.
The extent of the tests on the equipment as a whole will
depend on the type and function of the equipment. Tests
which should be performed, however, include circuit breaker
operation, and switchgear meggering, phasing, and
grounding checks.
High-potential tests to check the integrity of the insulation
are not necessary if the installation instructions are carefully
followed. If local codes demand this test or the purchaser
wishes to make high-potential tests, the test voltage should
not exceed
• 14 kV alternating current for 4.16 kV equipment
• 27 kV alternating current for 13.8 kV equipment
These voltages are 75% of factory test voltages, in accordance
with IEEE standards.
WARNING
!
Voltage transformers, control power transformers and surge
arresters must be disconnected during high-voltage testing.
Circuit Breaker Operation Test
All SecoGear circuit breaker compartments have a TEST
position in which the circuit breaker primary contacts are
disconnected while the secondary contacts are still engaged.
This TEST position permits complete testing of the electrical
control circuit without energizing the primary power circuit.
When the circuit breaker is first put into service, its control
circuit must be thoroughly tested while in this position to make
sure that all closing and tripping circuits are complete and
functioning properly.
The TEST position is not suitable for inspection and
maintenance of the circuit breaker and should therefore
be used only for testing circuit breaker operation.
Refer to Publication#DEH-50001 SecoVac Vacuum Circuit
Breaker Installation Manual for other preoperational checks
on the breakers.
Circuit Breaker Test Jumper (Optional)
An optional test jumper catalog number BMBJ1 can be
ordered, that will allow a breaker placed on the floor outside
the cubicle to be tested utilizing the lineup control circuit and
the breaker control switch on the compartment door. This
jumper will connect the secondary disconnect plug on the
breaker to the secondary disconnect coupler in the breaker
compartment. Normal open and close operation can be
verified by use of the control switch.
Circuit Breaker Test Box (Optional)
The test box (Figure 6-1) is used to operate a SecoVac VCB
that has been removed from the switchgear compartment.
It should be installed at a location where maintenance and
testing of the circuit breaker can be conveniently done.
The customer must provide and install cables to supply control
power for the test box. Make certain that the green ground
conductor is connected to the electrical ground.
For more information on the use and operation of the
Circuit Breaker Test Box, see GE publication DEH-500011.
Figure 6-1: SecoVac Test Box
SecoGear – Installation, Operation and Maintenance Manual 43 of 56
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