d
tank pole-mounted and substation-
mounted regulators, with the
convenience of pad-mounting.
The pad-mounted voltage regulator
provides step-type voltage regulation in
thirty-two (32) steps of approximately
5/8% each for a maximum of 10%
regulation when used singly or in
wye-connected banks. The voltage
regulator is available in voltage ratings,
7620/7200 and 14,400 volt for 60 Hertz
systems. Current ratings from 50 to
548 amperes are available.
Control of the voltage regulator is
microprocessor-based, with a digital
metering package of Class 1
accuracy. Instantaneous metering,
time/date-stamped demand metering,
and profile recording are provided.
Features include voltage limiting
capability, voltage reduction capability,
reverse power flow operation, tap
position tracking, and time/date
stamped metering.
The pad-mounted voltage regulator
provides state-of-the-art voltage
regulation while reducing installation
costs and preserving a more aestheti-
cally pleasing environment.
The pad-mounted voltage regulator, in
conjunction with pad-mounted trans-
formers and switchgear, can be used
to create a modular pad-mounted
substation. This substation can be
placed in areas that require a low
profile installation. It can be placed in
unobtrusive sites and possibly in
shared rights-of-way.
STANDARD FEATURES
A sealed tank construction combined
with a 65°C average winding rise
insulation system provides a proven
design for long life installations.
Additional capacity is available
through the ADD-AMP feature.
Internal construction allows easy
removal of the interior assembly. A
bolted cover also provides a large
area to perform maintenance with the
assembly in the tank.
Voltage Regulators
Single-Phase Pad-mounted Step
Electrical Apparatus
225-60
1
June 1998 Supersedes 1/98 (EPIC)
Printed in U.S.A.
Figure 1.
Single-phase pad-mounted voltage regulator. STANDARD FEATURES
Full metal barrier separating the two
compartments
Two parking stands
Three bushing wells & inserts or
600 A terminations
Standard padmounted green paint
(Munsell 7GY3.29/1.5)
Ground pads
Bolted oil tank cover
Nameplates (2)
Deep (31") removable cabinet
Automatic pressure relief device
Lifting lugs
Under-oil series arrester (3 kV)
Provisions for pressure/vacuum
gauge & thermometer
1" filter press connection and fill
plug
Control box with CL-5 control
Oil level gauge
Junction box and position indicator
1" drain valve with sampler
Control cable disconnect at junction
box and control box
Line-side lift-off door secured with
two captivated bolts
Pad-lockable lift-off control-side
door with three-point latching
Door position-retention rods
OPTIONAL ACCESSORIES
Bypass switch module
Internal differential PT
Alternate top coat color
Face plate-mounted tap changer for
PT taps
No barrier
Pressure/vacuum gauge
Dial-type thermometer (with or with-
out alarm contacts)
Under-oil shunt arresters (10 or
18 kV)
Control heater assembly
Single-Phase Pad-mounted Step
2
Figure 2.
The pad-mounted voltage regulator is delivered fully-equipped, ready for your application.
FULL METAL BARRIER SEPARATING
THE TWO COMPARTMENTS
BOLTED OIL TANK COVER
PARKING STAND (2) LIFTING LUGS (2)
1" FILTER PRESS CONNECTION AND FILL PLUG
CONTROL BOX WITH CL-5C CONTROL
1" DRAIN VALVE WITH SAMPLER
BUSHING WELLS & INSERTS OR
600 A TERMINATIONS
TAP CHANGER POSITION INDICATOR AND
JUNCTION BOX
AUTOMATIC PRESSURE RELIEF DEVICE
OIL LEVEL GAUGE
LASER ENGRAVED
NAMEPLATES (2)
OPTIONAL BYPASS SWITCH MODULE
SECTIONALIZING SWITCHES
SOURCE
BYPASS
LOAD 225-60
3
Voltage
Current
Height
Overall
Overall
Weight (Ibs.)
Total
(Volts)
(Amperes)
kVA
(in.)
Width (in.)
Depth (in.)
Oil (gal.)
Untanking
Weight (Ibs.)
7620
50
38
51
56
54
170
500
3100
7620
75
57
51
56
54
170
600
3175
7620
100
76
51
56
54
170
650
3225
7620
150
114
51
56
64
1
170
750
3325
7620
200
152
58
56
64
1
200
900
3925
7620
328
250
65
64
66
1
280
1440
4525
7620
438
333
65
64
70
1
355
1500
5650
7620
548
416
65
64
70
1
355
1800
6025
14400
50
72
51
56
54
170
775
3325
14400
100
144
58
56
66
1
230
1000
4125
14400
200
288
58
56
66
1
245
1400
4850
14400
300
432
64
64
70
1
355
1855
5965
14400
347
500
64
64
72
1
395
2245
6650
14400
400
576
68
64
72
1
395
2280
6800
14400
463
667
68
64
72
1
425
2350
7070
TABLE 1
Pad-mounted Voltage Regulator Weights and Dimensions, 60 Hertz
2
1
Includes cooling corrugate.
2
Weights, gallons of fluid and dimensions are for reference only, and not for construction. Please contact Cooper Power Systems for exact dimensions.
TABLE 2
Bypass Switch Module Weights and Dimensions
1
Voltage
Current
Height
Width
Overall
Oil Weight
(Volts)
(Amperes)
(in.)
(in.)
Depth(in.)
(gal.)
(Ibs.)
7620
200
30
30
12
30
400
7620
400
36
36
12
45
525
14400
200
30
30
12
30
400
14400
400
36
36
12
45
525
Figure 3.
Single-phase pad-mounted voltage regulator and optional bypass switch module.
NP
S
SL
L
HEIGHT
NP
LOAD
BYPASS
SOURCE
S
S
A
L
L
A
B
B
OVERALL WIDTH
OVERALL DEPTH
Figure 4.
Bypass switch module (optional).
NP
LOAD
BYPASS
SOURCE
S
S
A
L
L
A
B
B
DEPTH
WIDTH
HEIGHT
1
Weights, gallons of fluid and dimensions are for reference only, and not for
construction. Please contact Cooper Power Systems for exact dimensions. EASE OF OPERATION
The McGraw-Edison single-phase
pad-mounted voltage regulator has all
the functionality of 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 position
indicator is in clear view.
The junction box has a removable
side door which permits access to the
terminal block for the connections
from the tank to the control cable. The
control is connected from the control
box to the junction box with a quick-
disconnect control cable, which
enables easy removal. The current
transformer is automatically shorted
when the cable is removed.
Single-Phase Pad-mounted Step
4
Volts
Amperes
kVA
Bushing
BIL
7620
50, 75, 100,
38, 57, 76,
200 A well
95
150, 200
114, 152
& 15 kV 200 A insert
7620
328, 438,
250, 333,
600 A
95
548
416
integral bushing
14400
50, 100,
72, 144,
200 A well
125
200
288
& 25 kV 200 A insert
14400
300, 347,
432, 500,
600 A
125
400, 463
576, 667
integral bushing
Ratings: 65°C Average winding rise. Short circuit capability is 25 times 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
Standard Nameplated Voltages
7620
8000, 7970, 7620, 7200, 6930, 4800, 4160, 2400
14400
14400, 13800, 13200, 12000, 7970, 7620, 7200, 6930
TABLE 3
Product Scope, 60 Hertz
TABLE 4
Voltage Ratings, 60 Hertz
Figure 5.
Control box is mounted for easy access. Position Indicator and
ADD-AMP Capability
The position indicator is mounted on
a junction box on the frontplate of the
regulator, and is directly connected to
the tap changer by a flexible drive shaft
passing through the junction box and
terminal board via a sealing gland.
The indicator face is graduated in
steps, numbered 1 through 16 on
each side of zero. Zero designates
neutral. Drag hands indicate the max-
imum and minimum positions attained
during raise and lower operations.
The drag hands are reset around the
position indicator hand by operating
the drag hand reset switch on the
control front panel.
The ADD-AMP feature of the pad-
mounted voltage regulator allows
increased current capacity by reduc-
ing the regulation range. This is
accomplished by setting limit switches
in the position indicator to prevent the
tap changer from traveling beyond a
set position, in either raise or lower
directions. The limit switches have
scales graduated in percent regula-
tion, and are adjustable to specific val-
ues of 5, 6-1/4, 7-1/2, 8-3/4, and 10%
regulation to alter the regulation
range. The five possible load current
ratings associated with the reduced
regulation ranges are summarized in
Table 5. At each setting, a detent stop
provides positive adjustment. Settings
other than those with stops are not
recommended. The raise and lower
limits need not be the same value,
except for locations where reverse
power flow is possible.
225-60
5
Figure 6.
Position Indicator.
Load Current Rating (Amperes)
Rated
Rated
Regulation Range
Voltage
kVA
±10% ±8.75%
±7.50% ±6.25%
±5%
7620
38.1
50
55
60
68
80
7620
57.2
75
83
90
101
120
7620
76.2
100
110
120
135
160
7620
114.3
150
165
180
200
1
200
1
7620
152
200
200
1
200
1
200
1
200
1
7620
250
2
328/347
361/382
394/417
443/469
525/556
7620
333
2
438/464
482/510
526/557
591/600
600
1
7620
416
2
548/580
600
1
600
1
600
1
600
1
14400
72
50
55
60
68
80
14400
144
100
110
120
135
160
14400
288
200
200
1
200
1
200
1
200
1
14400
432
300
330
360
405
480
14400
500
347
382
416
468
555
14400
576
400
440
480
540
600
1
14400
667
463
509
556
600
1
600
1
TABLE 5
ADD-AMP Capabilities of 60 Hz Ratings
1
Limited by the bushing interface.
2
Regulators are capable of carrying current corresponding to rated kVA when operated at 7200 volts.