GE prolec VR-1 Installation, Operation And Maintenance Manual page 27

kVA
100
100
100
114.3
125
125
138
144
167
167
167
200
207
250
250
276
288
333
333
333
333
400
414
416
416
432
500
509
576
Compiled with reference to actual contact life tests of several selected ratings.
On the same basis, other VR-1 regulators rated less than 100 kVA and not shown in Table 7 can operate in excess of
1,000,000 tap changes before inspection is required. This is typically more than 25 years for normal service. Again, many
variables affecting contact life must also be considered.
prolec.energy/prolecge
Table 7. Expected Minimum Number of Operations
VOLTS
2500
5000
19920
7620
2500
5000
13800
14400
2500
5000
7620
19920
13800
5000
7620
13800
14400
5000
7620
14400
19920
19920
138000
7620
14400
14400
14400
7620
14400
LC = Low Current Switch
MC = Mid Current Switch
GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
AMP LIFE
400 1950000
200 2000000
50 2000000
150 600000
500 1100000
250 2000000
100 1250000
100 2000000
668 620000
334 1300000
219 1100000
100 2000000
150 2000000
500 560000
328 930000
200 1350000
200 1100000
668 310000
437 550000
230 740000
167 1150000
200 850000
300 660000
546 310000
289 540000
300 510000
347 230000
668 180000
400 230000
HC = High Current Switch
HV = High Voltage Switch
INSPECT SWITCH SIZE
1450000 HC
1500000 MC
1500000 HV
450000 LC
840000 HC
1500000 MC
960000 LC
1500000 HV
460000 HC
1000000 HC
830000 MC
1500000 HV
1500000 HC
420000 HC
700000 HC
1000000 HC
830000 HV
230000 HC
410000 HC
560000 HV
870000 HV
640000 HV
490000 HC
230000 HC
410000 HV
380000 HV
170000 HV
130000 HC
170000 HV
27