Industrial Power Conditioner and Voltage Regulator Guide
There are many types of power conditioner and voltage regulators for industrial and commercial applications. The table below details typical characteristics of four types of these power conditioners. Use the links on the left side to get explanations for each term. Feel free to contact us if you have any questions or need help with your power conditioning needs.
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Ferroresonant or Constant Voltage (CVT)
Transformer |
Mechanical
Voltage
Regulator |
Electronic
Voltage
Regulator |
UST
Sure-Volt
(EVR) |
Size |
Up to 20 KVA |
5 to 1,000 kVA |
5 to 350 KVA |
5 to 1,000+ KVA standard |
Voltages |
Up to 600v |
Up to 600v |
Up to 600v |
Up to 600v |
Application |
Single phase |
Single or three phase |
Single or three phase |
Single or three phase |
Input Range |
+10% to -25% |
+10% to -20% |
+10% to -25% |
+10% to -25% standard
(other ranges available) |
Output Regulation |
±1 to 5% |
±1% |
±3 to 5% |
±3% standard
(other ranges available) |
Response Time |
1 to 2 cycles typical |
20 to 120+ cycles typical |
1 to 3 cycles typical |
1 cycle typical |
Efficiency |
<50 to 90% |
95 to 98% |
95 to 97% |
96 to 99% |
Minimum Load Requirement |
None |
None |
Load may be required for proper operation |
None |
Load Power Factor Requirement |
Should be close to unity for proper regulation |
None |
0.6 leading to 0.6 lagging |
None
Works with any load |
Overload Capacity |
Output collapses above 150% of rated current |
1000% -30 cycles
(high current may cause brush damage) |
500% - 1 cycle 200% - 10 seconds 125% - 1 minute |
1000% - 60 cycles 500% - 5 seconds 200% - 1 minute |
Harmonic Distortion |
3 to 12 % |
Possible voltage notching on tap change |
Varies by manufacturer |
None Added |
Surge Suppression |
No |
Optional |
Optional |
Standard |
Line Isolation |
Yes |
No |
Varies by manufacturer |
Standard |
Noise Attenuation |
See Harmonic Distortion |
No |
Varies by manufacturer |
High |
Auto Bypass |
No |
No |
No |
Standard (no loss of load) |
Input Circuit Breaker |
Optional |
Optional |
Optional |
Standard |
Maintenance |
None |
Requires regular maintenance |
Cooling fans require regular maintenance |
No fans – no scheduled maintenance |
Special Sizing Considerations |
Must size for load inrush current and power factor |
None |
Must size for load inrush current and power facto |
None |
Other Considerations |
Sudden input voltage or load changes may cause output voltage problems |
Brush arcing may result in output voltage transients |
Frequent overload operation may lead to SCR failure |
Easily programmable for additional features or controllability |