Eaton EVER-Tap, Инструкции по установке, эксплуатации и обслуживанию

Страница: 16 / 52

Construction and operation
Eaton’s Cooper Power series VR-32 and EVER-Tap voltage
regulators are designed, manufactured, and tested in
accordance with IEEE Std C57.15-2017™/IEC 60076-21:2018-
12 standard. The regulators are rated and name-plated for
55/65 °C average winding rise.
The regulators are furnished with ANSI
® Type II mineral oil
per ASTM D-3487, containing less than 1 part per million
PCBs, at time of manufacture, as stated on the regulator
nameplate. Envirotemp™ FR3™ fluid is available as an
option.
Standard features, regulators with over-head
bushings
Bushings . The BIL rating of the bushings is compatible with
the BIL of the regulator, and all ratings, 250 kVA and below,
have bushings with a minimum creep distance of 18 inches.
The bushing designations (S, L, and SL) are permanently
marked on the regulator cover adjacent to the bushings. The
S, L, and SL bushings are interchangeable with each other.
For regulators rated 1200 A and below, each bushing
includes a threaded 1.125"-12 UNF-2A stud. For regulators
rated 1201 A and above, each bushing includes a 1.5"-12
UNF-2A stud. Connectors are not integral to the bushing.
Refer to Table 1 for standard terminals.
The threaded studs and connectors of the standard
terminals are plated bronze. Four-hole spade terminals are
available as an option for all current ratings.
Table 1 . Standard terminals
Rating (A) Standard Terminals
150 and below Clamp-type connectors for #6 to 250 MCM conductor
151-668 Clamp-type connectors for #6 to 800 MCM conductor
669-1200 4-hole spade
1201 and above 4-hole spade
Series arrester . All regulators are provided with an external
UltraSIL™ Polymer-Housed Evolution™ heavy-duty bypass
arrester connected across the series winding. For units
rated less than 22 kV, the series arrester is rated 3 kV. For
units rated 22 kV or larger, the series arrester is rated 6 kV.
Insulating fluid level sight gauges . Two insulating fluid
level sight gauges to indicate fluid color and level, one at 25
°C and the other at the critical fluid levels.
Position indicator . An external, corrosion-resistant position
indicator indicates the tap-changer position. The polymer-
constructed position indicator is slanted downward at a
45-degree angle for ease-of-reading when the regulator is
mounted above ground level.
Arrester mounting provisions . Stainless steel bosses are
provided for the mounting of lightning arresters adjacent to
the source (S), load (L), and source-load (SL) bushings. The
bosses are fully welded around their circumference.
Drain valve with sampler . All regulators have a 1" drain
valve with sampling device and a 1" upper filter press
connection.
Hand-hole cover . A hand-hole on the cover of the regulator
provides access for inspection purposes and to access
terminals used to reconnect the regulator for operation
at system voltages as shown in Table 9 (page 36) and
Table 10 (page 37).
Mounting .
Regulators rated 250 kVA and below are
provided with welded-on hanger brackets. Regulators rated
167 kVA and above are provided with a base suitable for
securing them to a pad or elevating structure. All regulators
are capable of being secured to elevating structures.
Ground Provisions . Regulators without a substation base
are provided with two stainless steel 1/2"–13 UNC welded
ground bosses located diagonally opposite from each other.
Regulators with a substation base have two stainless steel
ground pads located diagonally opposite from each other.
Each pad has two stainless steel 1/2"-13 UNC ground
provisions. All grounding provisions are located near the
base of the regulator.
Nameplates . Each regulator has two laser-etched
nameplates, one mounted on the control enclosure and the
other mounted on the regulator tank. The nameplates have
the manufacturer code and serial number bar-coded with
“3 of 9” coding with a 0.25" minimum height.
Pressure-relief device . A pressure-relief device vents at
approximately 5 psig.
Tank and Cover .
The sealed-tank construction permits
operation at 65 °C AWR without increasing the oxidation
rate of the insulating fluid.
The external parts of the tank and control enclosure are
painted light gray, ANSI ® 70 (Munsell 5BG7.0/0.4), and
meet the coating and security requirements of IEEE Std
C57.12.28™-2014 and IEEE Std C57.12.31™-2010 standards.
Also, the inside of the tank and bottom of the cover are
primed and/or painted.
An external electrical connection between the cover and
tank allows the cover-suspended internal assembly and tank
to be grounded together to eliminate voltage differentials
while energized.
Thermometer . Provisions for a tank thermometer are
standard for all voltage regulators with substation bases
(units 167 kVA and above).
Control cable . A multi-conductor neoprene 600 V, –50 °C
to 105 °C cable with disconnect plugs at each end provides
the connection between the internal circuitry of the voltage
regulator and the control.
Current transformer .
An automatic, solid-state CT shorting
device protects the internal CT from high voltages due
to the control cable being disconnected or cut while the
voltage regulator is energized.
Internal differential potential transformer (IDPT) .
The IDPT provide for a differential voltage measurement
between the S and L bushings. This measurement is used
by the regulator control for reverse power regulation, SAFE-
TO-BYPASS feature, and enhanced tap position tracking.
12
VR-32 and EVER-Tap™ Voltage Regulator
InstallatIon, operatIon, and MaIntenance InstructIons
MN225008EN June 2020