DET-882
SecoGear Medium-voltage Switchgear Application and Technical Guide
Standard SecoGear Construction, Features, and Installation
©2017 General Electric All Rights Reserved
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Figure 6-21: Cable Trough Opening
Ground Bus
The standard main ground bus bar uses 6 mm x 50 mm
copper and has a short-circuit rating of 40 kA symmetrical
for 2 s. The ground bus extends throughout the lineup with
connections to each breaker grounding contact and each
cable compartment ground terminal. All joints are made
with at least two M10 plated steel bolts per joint. Station
ground connection points are located in each end section.
Figure 6-22: Ground Bus Bar Bolt Locations
Equipment Heaters
Optional equipment heaters may be supplied for indoor
equipment. Each heater is rated 300 W at 240 Vac but
applied at half voltage (75 W for each heater element) for
long life. Four heaters are mounted in each section, two
front and two rear, for a total of 300 W per vertical section.
Finish and Paint
Switchgear enclosure parts are protected after
pretreatment of the metal, with an electrostatically applied,
baked-on polyester powder coat of Light Gray ANSI 61.
•
Dry Film Thickness- Between 2.0-4.0 MILS
•
60 in-lbs direct impact resistance
Unit Nameplates
Each unit door is furnished with a nameplate specifying
ratings of the section. Each nameplate is Each nameplate
is 76.2 mm x 115.89 mm [3 in. x 4.56 in.], white text on
medium grey background.
Accessories
Breaker Test Box
A Test Box is used to electrically operate the SecoVac VB2+
breaker when out of the breaker cell, typically at a test or
repair bench. It provides a convenient means to access the
breaker trip and close circuits during maintenance and
inspection procedures. The Test Cabinet contains trip and
close pushbuttons, on/off switch, control power fuses and
a 20 ft. secondary coupler for connection to the SecoVac
VB2+ breaker.
Figure 6-23: SecoVac Test Box
Breaker Racking Mechanism
An optional remote racking mechanism installed at the
factory as a part of the SecoGear, can use a motor for
racking the breaker in and out of the compartment. The
maximum torque applied is 28 Nm during the vacuum
circuit breaker racking.
Figure 6-24: Breaker Racking Mechanism
Ground and Test Device
GE offers a manually operated Ground and Test Device for
use in SecoGear switchgear. See SECTION 7. “Ground and
Test Device” for a complete description.