NEW
Solutions
for Underground
System Growth
Cooper’s Single-Phase Pad-mounted Voltage Regulator
Improved Power Quality
■ More Economical
■ Improved System Reliability
■ Increased Safety
■ Better Aesthetics
■ Lower Maintenance
■
URD
Voltage Regulation
with Fewer Problems
Now you can add a new dimension to underground system planning and
design. Cooper Power Systems’ pad-mounted voltage regulators give you
new freedom in improving safety, reliability and power quality in existing
and new underground systems. The pad-mounted voltage regulator helps
reduce installation costs, and preserves a more aesthetically pleasing
environment.
Substation designers now have a full complement of product to install a complete, modular pad-mounted
substation. Safety and reliability are enhanced, construction costs are reduced, land requirements are
smaller, and the physical profile presented to the public is smaller and more attractive.
Traditional methods of applying voltage regulation to 200 and 600 ampere URD systems all contain
inherent drawbacks. Riser pole installation of regulators requires that a pole location be selected and
approved, often a difficult process in congested or residential areas very sensitive to appearances.
Exposing the cable to the added risk of lightning surge damage is another drawback, one that could
prove to be very expensive in cable and equipment replacement costs.
A traditionally designed substation, with the lengthy processes of gaining rights of way, permitting, and
expensive construction, proves to be a time-consuming and costly alternative. In contrast, a deadfront,
pad-mounted substation with voltage regulation can be designed so that it is easier to site, easier to
install and maintain, while also being safer, more reliable and aesthetically pleasing.
Three-Phase Transformer
Ease of Operation
Kyle® Vacuum Fault
Interrupter Switchgear
Single-Phase Pad-mounted
Voltage Regulator
Cooper’s single-phase padmounted voltage regulator
has all the functionality of
the traditional round tank
regulators, with the convenience of pad mounting.
The control box is mounted on the door of the operational
side of the cabinet for easy access. As the operator uses
the control, the gauges and the position indicator are in
clear view.
The junction box has a side door for the operator to
access the terminal block for the connections from the
oil tank to the control cable. The control is connected from
the control box to the junction box with a quickdisconnect control cable, for easy removal. The current
transformer is automatically shorted when the cable
is removed.
Single-Phase Shrubline®
Transformer
Product Scope
Volts
Amperes
kVA
Bushing
BIL
7620
50, 75, 100,
150, 200
38, 57, 76,
114, 152
200 A well
& 15 kV 200 A insert
95
7620
328, 438,
548
250, 333,
416
600 A
integral bushing
95
14400
50, 100,
200
72, 144,
288
200 A well
& 25 kV 200A insert
125
14400
300, 347,
400, 463
432, 500,
576, 667
600A
integral bushing
125
Average winding rise: 65°C
Short circuit withstand: twenty-five times rated current for 2 seconds
Note: The 125 kV BIL rating is only limited by the bushing, all internal connections are
designed and constructed to 150 kV BIL. The 7620 volt units rated 200 amperes or
less are available with optional 25 kV class inserts.
Voltage Ratings
Voltage
Available Tap Voltage
7620
8000, 7970, 7620, 7200,
6930, 4800, 4160, 2400
14400
14400, 13800, 13200, 12000,
7970, 7620, 7200, 6930
Note: Each unit is capable of operating at different excitation voltages.
“Other system voltages, such as 4800 or 2400, are satisfied through the
use of the 7620 volt rating and the potential transformer.”
Substation
Distribution Feeders
A
B
C
Three-Phase
Transformer
Single-Phase
Pad-mounted
Voltage Regulator
Pad-mounted
Switchgear
Single-Phase
Pad-mounted
Voltage
Regulator
Single-Phase
Pad-mounted
Transformer
Add-Amp
The pad-mounted voltage regulator allows increased load carrying capacity at
reduced ranges of regulation. The limitation is the bushing interface (marked
with the *).
Volts
7620
7620
7620
7620
7620
7620
7620
7620
14400
14400
14400
14400
14400
14400
14400
Amperes
50
75
100
150
200
328
438
548
50
100
200
300
347
400
463
10%
8.75%
7.50%
6.25%
5%
50
75
100
150
200
328
438
548
50
100
200
300
347
400
463
55
83
110
165
200*
361
482
600*
55
110
200*
330
382
440
509
60
90
120
180
200*
394
526
600*
60
120
200*
360
416
480
556
68
101
135
200*
200*
443
591
600*
68
135
200*
405
468
540
600*
80
120
160
200*
200*
525
600*
600*
80
160
200*
480
555
600*
600*
Bypass Switch
Module
As with round tank regulators, bypassing a pad-mounted voltage regulator is an
option in system operation. Installing or removing the pad-mounted voltage
regulator from the circuit is accomplished with a stand-alone bypass switch
module. This switch module fits inside the secure pad-mounted regulator cabinet
during normal operation. When the regulator needs to be removed for normal
servicing, the bypass module provides hot stick operable sectionalizing switches
to disconnect the regulator from the system without causing interruption to the
downstream load.
Bypass Switch Ratings
Voltage
Current
Bushings
7620
200
200 A wells and 15 kV inserts
7620
400
600 A integral bushings
7620
600
600 A integral bushings
14400
200
200 A wells and 25 kV inserts
14400
400
600 A integral bushings
14400
600
600 A integral bushings
Standard
Features
The pad-mounted voltage regulator is delivered fully-equipped, ready for
your application:
Full metal barrier separating the two compartments
Two parking stands
Three bushing wells & inserts or 600 A terminations
• Standard pad-mounted green paint
• Ground pads
• Bolted oil tank cover
• Nameplates (2)
• Deep (31") removable cabinet
• Automatic pressure relief device
• Lifting lugs
• Under-oil bypass (3 kV) arrester
• Provisions for pressure/vacuum
gauge & thermometer
1" filter press connection and fill plug
Control box with control
Magnetic oil level and oil sight gauges
Junction box and position indicator
Optional bypass switch module
with sectionalizing switches
Optional
Accessories
1" drain valve with sampler
Optional external tap changer for PT taps
Readily available accessories are shown below. Other accessories are
available, please consult your Cooper Power Systems Sales Engineer.
Bypass switch module
Internal differential PT
Alternate top coat color
Deeper or shallower cabinet
External tap changer for PT taps
No barrier
Dial type liquid level gauge
Pressure/vacuum gauge
Thermometer
Under-oil shunt arresters (10 or 18 kV)
Control heater assembly
Scope
Pad-mounted Step-Type
Voltage Regulator
Specification
This specification covers outdoor, pad-mounted, single-phase, oil-immersed, step-type
voltage regulators that provide 10% regulation in thirty-two (32) steps of approximately
5/8% each.
Ratings
The ratings and terminations shall be according to the following table:
Voltage
Current
kVA
Bushings
BIL
7620
7620
14400
14400
50, 75, 100, 150, 200
328, 438, 548
50, 100, 200
300, 347, 400, 463
38, 57, 76, 114, 152
250, 333, 416
72, 144, 288
432, 500, 576, 667
200
600
200
600
95
95
125
125
A
A
A
A
wells and 15 kV class inserts
integral bushings
wells and 25 kV class inserts
integral bushings
The regulator shall be rated for an average winding rise of 65°C rise over a 30°C ambient.
The regulator shall be capable of a short circuit withstand of twenty-five times rated current for two seconds.
Note: The 125 kV BIL rating is limited by the bushing, all internal connections are designed and constructed to 150 kV BIL.
Each unit will be capable of operating at different excitation voltages, with settings below:
Voltage
Available tap voltage
7620
8000, 7970, 7620, 7200, 6930, 4800, 4160, 2400
14400
Construction
14400, 13800, 13200, 12000, 7970, 7620, 7200, 6930
Three bushings shall be provided. The
source-load bushing shall be externally
grounded.
Regulator
Control
The control panel shall be microprocessor based, have a temperature
range of -40°C to +85°C with the
following features:
All regulators shall be provided with a 3.0 kV under-oil,
metal oxide varistor (MOV) bypass arrester connected
across the series winding.
■ Digital metering package of Class 1 accuracy with
The tank and the cabinet shall be Munsell 7GY3.29/1.5
and meet the coating and security requirements of ANSI
C57.12.28.
■
■
■
■
The control enclosure shall be mounted on the right-hand
compartment door and connected to the junction box with
a quick-disconnect cable that automatically shorts the
current transformer when the cable is disconnected.
The operational (right-hand side) compartment shall be
fully separated by a metal barrier from the system voltage
(left-hand side) compartment to ensure operational safety
conditions.
Located in the operational compartment shall be:
■ An oil sight gauge which indicates oil color
■ A magnetic oil level gauge to indicate the oil level at
25°C ambient
■ A 1" drain valve with sampling device
■ A 1" upper filter press connection
■ A tap position indicator mounted inside the cabinet to
instantaneous and time/date stamped demand values
Voltage limiting capability
Voltage reduction capability
Reverse power flow capability
Tap position tracking
The following accessories shall be provided when checked.
A bypass switch module which would mount inside the
secure cabinet and allow the regulator to be removed
from service without interrupting the continuity of the
system.
A (source-to-load) differential PT to provide complete
operation and metering under reverse power flow
conditions.
A thermostatically-controlled heater assembly to reduce
moisture in areas of high humidity. The heater assembly
shall include an ON-OFF switch. In the ON position, a
thermostat in the heater assembly shall activate the
heater at approximately 30°C (85°F) and turn it off at
approximately 40°C (100°F).
minimize the incidence of damage
■ Two anodized aluminum laser-etched nameplates,
one mounted on the control enclosure and the other
mounted on the regulator tank. The nameplates shall
have bar coding, in accordance with ANSI C57.12.33
Bulletin Number 97046
© 1997 Cooper Power Systems, Inc.
Cooper Power Systems
2300 Badger Drive
Waukesha, WI 53188-5951
Fax: 414-896-2350
www.cooperpower.com