20
Types SDV-R and SDV-R-AR distribution circuit breakers |
Instruction manual
External manual trip
1. Energize control power circuit by closing
knife switch shown in Figure 7: Relay and
control and operator compartments for
type SDV-R circuit breaker with stored-
energy operator on page 18. The spring
charging motor should charge the circuit
breaker closing springs.
2. Use the manual close control to close the
circuit breaker.
3. Pull the external manual trip (red knob on
side of enclosure) to trip the circuit
breaker, and maintain the external
manual trip in the “pulled” condition.
4. Attempt to close the circuit breaker
manually and electrically. The circuit
breaker should not close.
5. Release the external manual trip, and
reset the external manual trip mechanism
by pushing on the black reset knob inside
the operator compartment. The reset
mechanism is to the left of the operating
mechanism.
6. After resetting the external manual trip
mechanism, attempt to close the circuit
breaker manually or electrically. The
circuit breaker should close.
7. Open control power circuit by opening
knife switch shown in Figure 7: Relay and
control and operator compartments for
type SDV-R circuit breaker with stored-
energy operator on page 18.
8. Repeat the spring discharge check
presented on page 18.
9. Verify the springs are DISCHARGED and
the circuit breaker primary contacts are
OPEN by observing the indicator
positions.
Final mechanical inspection and testing
without control power
Before the circuit breaker is energized, it must
be thoroughly inspected and tested. Correct
any deviations before energization.
Inspection
Check the following points:
1. Make a final mechanical inspection of the
circuit breaker. Verify the contacts are in
the OPEN position, and the closing springs
are DISCHARGED.
2. Confirm the circuit breaker is properly set
up and reasonably level on its foundation
and appropriately anchored to the
foundation.
3. Check the tightness of all hardware on the
cabinet, adjustable legs, bushings, bus
bars and operator mechanism.
4. Verify that the operating mechanism has
been properly lubricated.
5. Blocking, supports and other temporary
ties remove from circuit breakers,
instruments, protective relays, etc.
6. Proper fuses correctly placed.
7. Temporary wiring jumpers (used on the
secondaries of current transformers wired
to external devices, as shown on wiring
diagrams) removed.
8. All ground and grounding connections
properly made.
9. Incoming primary and secondary
connections properly made and checked
for shorts or undesired grounds.
10. Verify all covers, and bolted connectors
are securely fastened.
11. Protective relays coordinated with other
protective relays and protection devices
on the system. Refer to protective relay
instructions before making any
adjustments.
12. Examine the vacuum interrupters for
damage, and wipe the vacuum
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. Arc-exhaust vents correctly secured,
undamaged, and free to open in the
event of an internal arcing fault.
15. Retouch any paint that has been damaged
during installation.
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 circuit breaker with high
voltage.
