2.5.1.5
Specific Unit Requirements
**************************************************************************
NOTE: Revise this paragraph and paragraph POWER
TRANSFORMERS to include listing of unit items if an
articulated primary unit substation is not provided
and interrupter switchgear is to be specified.
Placing CT's and ammeters/switches in metal-enclosed
interrupter switchgear is costly and often leads to
additional cubicles. Unlike the metal-clad design
which puts grounded metal barriers around bus,
switchgear, incoming line, outgoing line, and
control sections, metal-enclosed interrupter
switchgear is not so compartmentalized. Thus,
building a safe compartment for ammeters/switches is
not really consistent with the basic design.
Ammeter and switch will be located on the secondary
main breaker.
**************************************************************************
In addition to basic requirements, switchgear shall contain other devices
as appropriate to the application and as specified in paragraph SUBSTATION
EQUIPMENT.
2.5.2
Devices and Accessories for Switching/Interrupting Equipment
2.5.2.1
Incoming Line
**************************************************************************
NOTE: Delete Items "e" and "f" if not required.
**************************************************************************
Incoming line units shall be coordinated with the requirements of the
serving utility, and to the protected transformer, and shall include the
following control and monitoring system items that shall be mounted in the
instrument and relay cabinet specified below.
a.
An ammeter and an ammeter switch.
b.
A control switch for local or remote control operation.
c.
Three overcurrent relays, devices 50/51.
d.
One residually-connected ground-overcurrent relay, device 50/51N.
e.
Three directional overcurrent relays, device 67.
f.
One ground-directional-overcurrent relay, device 67N.
g.
Three transformer differential relays, device 87T and an auxiliary
lockout relay, device 86T [located in the associated metal-clad
switchgear] [located in the instrument and relay cabinet].
h.
[Single-] [Three-] phase secondary potential test blocks with
associated test plug, quantity as shown.
i.
[Single-] [Three-] phase secondary current test blocks with
associated test plug for [each current transformer circuit] [each
three-phase set of current transformers], as indicated.
SECTION 16311A
Page 26
Previous Page
