equipment connection provisions. Substation
transformers require only bushings; articulated
primary unit substations require only equipment
connection provisions.
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[Bushings] [and equipment connection provisions] [Equipment connection
provisions] shall be provided as specified for [Primary Unit Substation]
[Substation Transformer] [Articulated Primary Unit Substation] in paragraph
SUBSTATION EQUIPMENT. Primary and secondary cover bushings for high- and
low-voltage line and neutral connections shall conform to the requirements
of IEEE C57.19.00 and IEEE C57.19.01 and shall [have the same BIL as] [be
one BIL higher than] the associated power transformer's high- and
low-voltage BIL ratings respectively.
2.6.1.6
Accessories
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NOTE: Delete inapplicable items. Provide devices
63X and 86T when protective device tripping is
required. Delete when only an alarm actuation is
required.
**************************************************************************
Transformers shall be provided with the accessories listed below. Contact
devices for remote control features shall be rated for the application and
shall be suitable for the low-voltage ac or dc available, as shown or
specified.
a.
A tap-changer for de-energized operation (TCDO) provided with
padlock provision [and key-interlocked with the disconnecting
switch protecting the associated transformer].
b.
A liquid-level indicator and relay (device 71L), shall be provided
with two sets of normally-open and normally-closed contacts, one
set for low-liquid-level and the other set for high-liquid-level.
The contacts shall be rated for the application and wired to one
annunciator alarm point.
c.
A pressure-vacuum gauge when the transformer is provided with a
sealed-tank or inert gas-pressure oil preservation system.
d.
Drain and filter valves.
e.
Lifting, moving, and jacking facilities.
f.
Two transformer case grounding lugs for termination of No. 4/0 AWG
bare copper cables.
g.
Sudden Pressure Relay: A sudden pressure relay, device 63SPR,
shall be provided as an integral part of the transformer. A set
of contacts of device 63SPR shall be [wired to energize an
auxiliary relay, device 63X,] [located in the] [transformer
terminal cabinet] [metal-clad switchgear] [instrument and relay
cabinet]. [A set of contacts of device 63X shall be wired to
energize the transformer lockout relay, device 86T. In turn,
contacts of device 86T shall be wired to annunciate abnormal
transformer pressure and trip the main secondary breaker and the
circuit breaker on the primary side of the faulted transformer.]
SECTION 16311A
Page 37
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