13
ABB
ELECTRICAL OPERATION:
To operate the breaker electrically, control power must be available. The section entitled Racking describes the
application of control power through the secondary disconnect when the breaker is in the Test and Connect positions.
Optional test jumpers and test cabinets to connect control power to a withdrawn circuit breaker are available (contact
the local ABB sales office for details).
1. Inspect initial state of the breaker to determine the operations available
a. Close/Open Indicator
b. Closing Spring Charged/Discharged Indicator
c. Circuit breaker position Test or Connect (or control power applied externally, if withdrawn)
d. Motor Disconnect Switch
2. Turn Motor Disconnect Switch to ON with available control power
a. Charging motor energizes
• Charge time approximately 8-10 seconds (at nominal voltage)
• Closing Spring Charged/Discharged Indicator shows CHARGED
b. Breaker ready to perform C-O operation
3. Close breaker using manual close push-button or by electrical signal to the rotary close coil (after close operation
the motor charges unless control power is removed)
a. Close coil rotates half shaft and closes breaker
• Close/Open Indicator changes to CLOSED
• Closing Spring Charged/Discharged Indicator changes to DISCHARGED
• Charging motor energizes
• Charge time approximately 8-10 seconds (at nominal voltage)
• Closing Spring Charged/Discharged Indicator shows CHARGED
b. Breaker ready to perform O-C-O operation
4. Open breaker using manual open push-button or by electrical signal to the rotary open coil
a. Open coil rotates half shaft and opens breaker
• Close/Open Indicator changes to OPEN
• Closing Spring Charged/Discharged Indicator remains CHARGED
b. Breaker ready to perform C-O operation
5. Breaker ready to continue operations returning to step 3 above until the Spring Charging Motor Switch is turned
OFF or control power is removed. Once control power is removed from the charging motor, the Closing Spring will
not recharge after a close operation.
MECHANISM AND OPERATION
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
