Section 4 - Operation; Stored Energy Mechanism Key Features; Circuit Breaker Charging; Two Step Mechanism Design - GE EntelliGuard G Installation, Operation And Maintenance Manual

EntelliGuard® G Circuit Breaker
Section 4 – Operation
SECTION 4 – OPERATION
WARNING
IMPROPER INSTALLATION, OPERATION AND
MAINTENANCE
Ensure only qualified personnel install, operate, service
and maintain all electrical equipment.
Failure to comply with these instructions will result in
death or serious injury.
WARNING
PERSONAL INJURY
 Avoid risk of injury from moving parts while handling
the breaker.
 If advisable, use a cable/busbar lockable grounding
device (optional accessory) to provide additional safety
during system maintenance.
Failure to comply with these instructions could result in
death or serious injury.
CAUTION
PRODUCT DAMAGE
 Ensure circuit breaker and its accessories are always
used within their designated ratings.
 Use the specially designed circuit breaker handling
truck (optional accessory) when removing the circuit
breaker from its cassette.
Failure to comply with these instructions may result in
product damage.
STORED ENERGY MECHANISM KEY FEATURES (Table 4.1)
NOTICE
 Each charging action provides sufficient charge for an
O-C-O (Open-Close-Open) operation without requiring
additional charging.
 The mechanism works properly only when the circuit
breaker is mounted on a horizontal plane with bottom
mounting or on vertical plane with front mounting.
Table 4.1. Stored Energy Mechanism Sequences of Operation
ON/OFF Main Breaker
Indicator Contacts
OFF open
OFF open
ON closed
ON closed
OFF open
ON closed
OFF open
20
Courtesy of store.ips.us
Charging Spring Condition of
Indicator Charging Springs
discharged discharged
charged fully charged
discharged discharged
charged fully charged
charged fully charged
charging partially charged
charging partially charged

Circuit Breaker Charging

The circuit breaker can be charged in one of two ways:

Manually, using a charging handle.
The charging handle lies flush within the circuit
-
breaker front cover. It is easily retracted without
special tools.
Full spring charging is accomplished with 10 full
-
pumps or less of the handle. Handle movement
includes suitable stops so that it cannot be over
extended and cause operator injury.
The handle engages the charging ratchet during
-
motion away from the circuit breaker front cover
and rotates freely on the return stroke.

Electrically, via a motor operator that is automatically
activated after the closing operation.

Two Step Mechanism Design


The first step charges the closing spring through the
manual charging handle or through the spring
charging motor.

The second step closes the circuit breaker via the
PUSH ON (UL)/CLOSE (ANSI) pushbutton on the front
cover or closes the breaker through energizing the
closing coil.

The mechanism is trip free and incorporates an anti-
pumping system:
The circuit breaker may be closed only after the
-
mechanism is fully charged and there is no active
open command.
The closing coil has an electrical anti-pumping
-
feature. The coil supply, if maintained
continuously, will attempt to close the circuit
breaker only one time. To achieve a second
closing attempt, the closing coil must be de-
energized and energized a second time.
Next Permissible Operating Function
closing springs may be charged
contacts may be closed, then opened
contacts may be opened or closing springs may be charged
pen-closed-open sequence may be carried out and the closing
springs can be charged after the close operation opened
closing spring may be discharged without closing contacts
complete charging
complete charging
©2012 General Electric All Rights Reserved
DEH-41304C
13 March 14