9. Incoming primary and secondary connections properly
made and checked for shorts or undesired grounds.
10. See that all covers, and bolted connectors are securely
fastened.
11. Relays coordinated with other relays and protection de-
vices on the system. Refer to relay instructions before
making any adjustments.
12. Examine the vacuum interrupters for damage, and wipe
the interrupters and other insulating parts with a clean,
dry cloth.
13. All filters in vent areas are clean and free of shipping or
construction material.
14. Retouch any paint that has been damaged during in-
stallation.
Testing
Note: No hazardous X-radiation is produced with closed
contacts, or with open contacts with rated operating volt-
age applied.
1. An insulation resistance test is advisable on the control
circuit to be sure 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 following 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 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 interrupter must be replaced.
Note: The DC test voltage is given as a reference only. It
represents values believed to be appropriate and approxi-
mately equivalent to the corresponding power frequency
withstand test values specified for each voltage rating. The
presence of this column in no way implies any requirement
for a DC withstand test on AC equipment or that a DC with-
stand test represents an acceptable alternative to AC with-
stand tests. When making DC tests, the voltage should be
raised to the test value in discreet steps and held for a pe-
riod of one minute.
Field Dielectric Tests are recommended when new units
are installed, or after major field modifications. The equip-
ment should be put in good condition prior to the field test.
It is not expected that equipment shall be subjected to these
tests after it has been stored for long periods of time or has
accumulated a large amount of dust, moisture, or other
contaminants without being first restored to good condi-
tion.
Installation Checks and Initial Functional Tests
Rated
Maximum
Voltage
kV (rms)
Power
Frequency
Withstand
kV (rms)
Field Test Voltage
kV (rms)
kV (dc)
15.5
25.8, 27.6
50
60
37.5
45
53
63.6
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 the 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-radiation.
Can cause serious injury.
X-rays can be produced when a high voltage
is placed across two circuit elements in a
vacuum.
Keep personnel more that six (6) feet away
from a circuit breaker under test. All normal
metallic doors and panels must be installed
during tests.
Excessive test voltages.
May result in damage to equipment.
Do not perform dielectric tests at test voltages exceeding the
ratings of the tested equipment.
Shipping bracing and tag between phase barriers (on units
so equipped) may damage circuit breaker.
May result in damage to equipment.
Remove bracing and tag (on units so equipped) before
energizing breaker high voltage.
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