SecoGear – Installation, Operation and Maintenance Manual 21 of 56
This section contains an overview of the SecoVac vacuum
circuit breaker, along with the functions of the electrical and
mechanical systems. For complete operation and maintenance
instructions refer to Publication#DEH-50001 SecoVac Vacuum
Circuit Breaker Installation Manual.
Maintenance personnel should keep constant, accurate
written records as an aid in future service planning and
equipment reliability improvement. Promptly report any
unusual experiences to GE.
The closing and opening mechanisms are of the stored energy
type and use a gear motor to charge a closing spring. During
a closing operation, the energy stored in the closing spring is
used to close the vacuum interrupter contacts; compress the
wipe springs, which load the contacts; charge the opening
spring; and overcome bearing and other friction forces. The
energy then stored in the wipe springs and opening spring will
open the contacts during an opening operation.
Closing and opening operations are controlled electrically
by the switchgear or remote relaying. Mechanical control is
provided by manual close and trip buttons on the
circuit breaker.
The closing spring may be manually charged. The mechanism
will operate at the AC or DC voltage indicated on the circuit
breaker nameplate.
Circuit breakers are provided with a MOC switch plunger and
a TOC switch actuator when needed. These will work with the
MOC and TOC switches to indicate whether a circuit breaker is
open or closed, and whether it is in the connected position.
Circuit Breaker
The type SVGTXX Manual Ground and Test Device is an auxiliary
removable device for use in SecoGear metal-clad switchgear
equipment during initial installation and at normal maintenance
periods. The Ground and Test device does not contain interrupters
or a mechanism; therefore, it has no interrupting or close-
making capability. The device is provided with primary finger
connections to match the circuit breaker compartments (1200
A or 2000 A) and has a momentary withstand capability equal
to the switchgear (104 kA peak). For more detailed information
refer to Publication#DEH-50007 SecoVac Ground and Test Device
Installation Manual.
The function of this device is to solidly ground the equipment
manually as well as permit various types of tests. It provides a
convenient means of grounding a system bus or cable connections
to safeguard personnel who may be working on the equipment.
Exposed Ground and Test Device terminals can also be used for
applying a high potential test, measuring insulation resistance to
ground and phasing cables. Refer to the Ground and Test Device
manual for a detailed description of the design and operating
principles before using.
Manually Operated Ground and Test Device
Figure 3-14: Manual Ground and Test Device
Use of the motor-operated remote racking device to
connect or withdraw any ground and test device is
strongly recommended.
NOTICE
The performance and safety of all equipment may be
compromised by the modification of supplied parts or their
replacement by non-identical substitutes. All such design
changes must be qualified to the original manufacturer’s
specifications.
NOTICE
To Next Page
Loading...
Need help?
General
