Electronic Voltage Regulator Characteristics
Electronic voltage regulators are typically designed for indoor, low voltage applications and are air-cooled (i.e. using dry-type transformers instead of oil-filled). Other characteristics of tap switching and double conversion EVRs differ substantially so they are listed separately below:
Tap Switching Electronic Voltage Regulators
Double Conversion Electronic Voltage Regulators
Efficiency for a tap switching EVR is usually fairly flat across the load range from 10 to 100% of rated load. However, the efficiency for a double conversion EVR tends to drop quickly as the load drops below 100%. Other factors like ambient temperature, power factor, load type etc. can also negatively impact double conversion EVR efficiency.