22
Types SDV-R and SDV-R-AR distribution circuit breakers |
Instruction manual
4. Verify main contact status indicator shows
CLOSED. Press the trip pushbutton and
verify the main contact status indicator
shows OPEN. The spring condition
indicator should also show DISCHARGED.
5. Energize the control circuits. The motor
should run to charge the closing springs,
and then automatically turn off.
6. Close the circuit breaker electrically
(locally and remotely as applicable) and
verify the circuit breaker shows CLOSE and
remains closed by checking the main
contact status indicator. Note that the
motor will immediately run to recharge
the closing springs.
7. Trip the circuit breaker electrically (locally
and remotely as applicable).
8. Trip the circuit breaker by passing
sufficient current (or voltage if applicable)
through the coils of protective relays.
9. Repeat the close and trip operations
several times to assure proper operation.
10. Check the tripping and closing times from
coil energization to contact part or
contact make.
Placing equipment into service
To place equipment in service for the first
time proceed as follows:
1. Check that the circuit breaker is OPEN and
all control circuits are energized.
2. Check torque of the bolts that secure the
roof bushings to the top plate of the type
SDV-R distribution circuit breaker. Torque
should be in the range of 20-25 ft-lbs (27-
34 Nm).
3. Connect primary incoming power source
to circuit breaker.
4. Check all instruments, protective relays,
meters, etc.
5. Connect as small a load as possible and
observe instruments.
6. Gradually connect more load to the
equipment while observing instruments
until the full load is connected.
7. Check for signs of overheating of primary
and secondary circuits and satisfactory
operation of all instruments during the
first week of operation.
Rated
maximum voltage
Rated power-
frequency withstand Field-test voltage
kV (rms)
kV (rms)
kV (rms)
kV dc
38.0
80
60
85
Table 2: High-potential test voltages
Note:
The dc test voltage is given as a
reference only. It represents values believed to
be appropriate and approximately 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
withstand test represents an acceptable
alternative to ac withstand tests. When
performing dc tests, the voltage should be
raised to the test value in discrete steps and
held for a period of one minute.
Note: Do not use dc high-potential testers
incorporating half-wave rectification. Such
devices produce high peak voltages.
These high voltages will produce X-ray
radiation. Such devices also show erroneous
readings of leakage current when testing
vacuum circuit breakers.
Field dielectric tests are recommended when
new units are installed, or after major field
modifications. The equipment 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 condition.
A dielectric test on secondary and control
circuits should be made for one minute at
1,125 volts ac or 1,590 volts dc. The above
voltages are in accordance with NEMA
Standards.
Note:
Certain control devices, such as
motors and motor circuits, should be tested
at 675 volts ac. Electronic devices should
be tested at the voltages specified in the
instruction manual for the electronic device.
3. Charge the closing springs manually and
push the close pushbutton to close the
circuit breaker.
