GE Industrial Solutions EntelliGuard E Circuit Breaker - Manual (Page 16)

EntelliGuard® E Circuit Breaker DEH-41526
16 ©2012 General Electric All Rights Reserved
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.
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.
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
CLOSE 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.
Table 4.1. Stored Energy Mechanism Sequences of Operation
OPEN/CLOSED
Indicator
Main Breaker
Contacts
Charging Spring
Indicator
Condition of Charging
Springs
Next Permissible Operating Function
OPEN open discharged discharged closing springs may be charged
OPEN open charged fully charged contacts may be closed, then opened
CLOSE closed discharged discharged contacts may be opened or closing springs may be charged
CLOSE closed charged fully charged open-closed-open sequence may be carried out and the closing
springs can be charged after the close operation opened
OPEN open charged fully charged closing spring may be discharged without closing contacts
CLOSE closed charging partially charged complete charging
OPEN open charging partially charged complete charging
CLOSING SPRING DISCHARGE PROCEDURE
The main spring may be discharged (also known as
“crashing the mechanism”) without closing the breaker by
using a special tool operated through a small window on
the front cover.
The mechanism closing springs are automatically
discharged (crashed) when the circuit breaker is moved
from the DISCONNECT position to the WITHDRAWN fully
disconnected position and vice versa.
The closing springs must be discharged prior to removal
of the arc-chute cover.