GE SecoGear Application Guide

DET-882 SecoGear Medium-voltage Switchgear Application and Technical Guide
SecoGear Switchgear Applications
©2017 General Electric All Rights Reserved 37
SECTION 5. SECOGEAR SWITCHGEAR APPLICATIONS
This section covers typical circuit application packages for
SecoGear metal-clad switchgear equipment.
The beginning of this section describes basic equipment for
the protection, instrumentation, and control for each type of
circuit. Ten standard applications are shown, including basic
equipment and devices for commonly used configurations.
Then, front-view drawings demonstrate the allowable
SecoVac and auxiliary compartment stacking combinations.
This section concludes with a sample lineup arrangement of
breaker and VT locations. Devices illustrated in this section
are assumed to utilize 125 Vdc control voltage.
To correctly utilize this section, follow these steps:
1. Determine the type and number of breaker circuits
required, based on your one-line diagram.
2. Select the circuits that you will need from among the 10
basic circuit descriptions.
3. Choose any of the optional features of each circuit:
protection, instrumentation, and control portion.
4. Determine the requirements for auxiliary compartments
to house voltage transformers (VTs) or control power
transformers (CPTs).
5. Determine the incoming and outgoing circuit conductor
configurations required for each circuit.
6. Select the equipment configurations necessary for each
circuit and auxiliary compartment. Refer to Figure 1-5
through Figure 1-26 covering breaker and auxiliary
compartments.
7. Sketch your basic layout using the typical sections,
accounting for all required breakers, VTs, CPTs, incoming
connections, tie breakers or aux tie compartments,
transition, and any utility metering or special sections.
Based on the breaker and auxiliary compartments and
options selected, you can establish a structured lineup of
metal-clad equipment. Some lineups, however, may require
devices and circuit arrangements other than those included
in this section. Contact your GE Sales Representative for
more information on special configurations.
GLOSSARY: BASIC EQUIPMENT APPLICATIONS
A brief definition of each of the 10 basic equipment circuits is
provided below.
General-purpose feeders
General-purpose feeder (GPF) equipment is a metal-clad
circuit breaker and compartment, controlling and
protecting a set of conductors supplying one or more
secondary distribution centers, one or more branch-
circuit distribution centers, or any combination of these
two types of equipment. A general-purpose feeder
includes circuit overcurrent protection, circuit current
indication, and circuit control.
Transformer primary feeders
Transformer primary feeder (TPF) is similar to a general-
purpose feeder except the entire load is one transformer
and often includes differential protection for the entire
circuit. Liquid filled transformers of an MVA rating to
justify differential protection for the circuit are usually
equipped with fault-pressure relays for additional
internal protection. Both the differential and fault-
pressure relays trip a hand-reset lockout relay, which
trips the primary and secondary transformer circuit
breakers.
Single-source incoming lines
Single source incoming line (SSIL) equipment is metalclad
equipment for a main power distribution bus, with only
one source of power supplying the bus. A system with
this type of incoming line is called a radial system. A
system with two or more incoming lines supplying
distribution buses sectionalized by normally open bus-tie
circuit breakers requires the same type of protection,
instrumentation, and control as single source incoming
lines, with the possible exception of the connection of the
overcurrent relays.
Dual source incoming lines
Dual source incoming line (DSIL) equipment is metalclad
equipment for a main power distribution bus with two
sources of power supplying the main bus. One source is
typically the normal source. The other source of power
may be either another incoming line or a local generator.
Both sources supply a common distribution bus with or
without a normally closed bus-tie circuit breaker.
Bus ties
A bus tie (BT) is metal-clad equipment connecting two
power distribution buses through a tie breaker. Such
equipment often is not equipped with overcurrent relays
because of the difficulty of obtaining selective system
operation with bus-tie overcurrent relays. A bus tie
requires two compartments in adjacent sections; see
available arrangements later in this section (Figure 5-5).
Bus entrances
A bus entrance (BE) is a metal-clad vertical section in
which one of the compartments contains incoming
conductors (cable or bus duct) which are connected
directly to the main bus (also referred to as a cable tap).
No incoming breaker is used. This arrangement applies to
lineups of switchgear, without main circuit breakers,
which connect the incoming line directly to the main bus.
It also applies to subfeeds from a lineup of switchgear
without circuit breakers, connecting the outgoing
conductors to the main bus.

GE SecoGear Specifications

General

Brand	GE
Model	SecoGear
Category	Switch
Language	English