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1. An insulation resistance test is advisable
on the control circuit to verify that all
connections made in the field are
properly insulated.
2. A dielectric test, if possible, should be
made on the high-voltage circuit for one
minute at the voltages corresponding to
the rated voltage of the equipment. The
voltage should be raised gradually and
the circuit under test should sustain the
voltage for one minute.
When the test is performed with the
circuit breaker open, the integrity of the
vacuum interrupter will also be verified.
If these levels cannot be sustained and
there is no other source for the failure,
the vacuum interrupter must be
replaced.
Testing
Note: No hazardous X-radiation is produced
with closed contacts, or with open contacts
with rated operating voltage applied.
High potential tests employ hazardous voltages.
Will cause death or serious injury.
Follow safe procedures, exclude unnecessary personnel and use safety
barriers. Keep away from circuit breaker during application of test voltages.
After test completion, ground both ends and the middle ring (if visible) of
the vacuum interrupter to dissipate any static charges.
Vacuum interrupters may emit X-ray radiation.
Can result in serious injury.
X-rays can be produced when a high voltage is placed across two circuit
elements in a vacuum.
Keep personnel more than six feet away from a circuit breaker under test. All
normal metallic doors and panels must be installed during tests.
NOTICE
Excessive test voltages.
May result in damage to equipment.
Do not perform dielectric tests at test voltages
exceeding the ratings of the tested equipment.
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