GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
prolec.energy/prolecge
16
3.13 Voltage Regulator for Grounded-Y Circuits
The step voltage regulator rated 19920/34500 volts is designed for use on 34500 grounded-Y circuits. This regulator is
designed with two 150 kV BIL class line bushings (S and L). The neutral is brought to a 95 kV BIL bushing (SL).
Regulators rated 14400/24940 volts are designed for use on either 14400 delta or 24940 grounded-Y circuits. A tap is
provided for operation at 7200 volts delta or 12470 Y operation at reduced capacity. The current rating of the regulator must
not be exceeded when operating at the lower voltages.
The regulator is designed with two 150 kV BIL line bushings (S and L) and a 95 kV BIL neutral bushing (SL).
When operating on a 25 kV or 34.5 kV circuit, the SL bushing must be solidly grounded or grounded through an impedance
that will limit the low frequency and impulse from neutral to ground to 95 kV BIL.
3.14 Other Than Rated Voltage
All regulators, except those of the 19920-volt rating, are provided with taps on the potential transformer for reduced voltage
operation. These taps make it possible to obtain the proper voltage for the control circuit. When operated at other than rated
Except for certain operating voltages for 7620-volt regulators, all ratios of potential transformers may be changed by changing
the connection of jumpers on the power disconnect circuit board located in the upper right hand corner of the control cabinet.
Other connections are to be changed inside the regulator tank. For proper connections, see the regulator nameplate.
Table 3. Standard Potential Ratios
Rated Voltages Operating Voltages Potential Ratios
Voltage Levels of
Voltage Sensors
2500/4330Y 2500
2400
20.8:1
20:1
120
120
5000/8660Y 5000
4800
2500
41.7:1
40:1
20.8:1
120
120
120
7620/13200Y 7960
7620
7200
5000
4800
4330
4160
2500
2400
66.3:1
63.5:1
60:1
47.7:1
40:1
36.1:1
34.7:1
20.8:1
20:1
120
120
120
120*
120*
120*
120*
120*
120*
13800 13800
13200
12000
115:1
110:1
100:1
120
120
120
14400/24940Y 14400
7200
120:1
60:1
120
120
34500Y/19920 19920 166:1 120
*Taps are not provided on voltage regulators rated less than 75 kVa
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