The parameters that are related to line loss compensation are listed below.
- Rated generator voltage
- Generator PT primary voltage rating
- Generator PT secondary voltage rating
- Voltage set point
- Generator frequency
- Knee frequency
- Integral gain
- Derivative gain
- Proportional gain
- Loop gain
- Generator current transformer (CT) current primary rating
- Generator current transformer (CT) current secondary rating
- Load compensation mode
- IR compensation
- Rated generator current
- Programmable input (current firmware only)
Current flowing through a long conductor causes a voltage drop due to the resistance of the wire. Therefore, the voltage at the load end of the conductor will be lower than the voltage at the generator end of the conductor. The condition is commonly referred to as line losses. In order to improve the power quality, the digital voltage regulator can compensate for this phenomenon.
As the generator load increases, the regulator will cause the generator output voltage to rise slightly. The slight rise in generator output voltage is used to compensate for line losses. Line drop percentage controls the amount of compensation. The line drop percentage should be adjusted to yield a constant voltage at the load.
Line loss compensation is mutually exclusive to reactive voltage droop. Line loss compensation and reactive voltage droop work opposite of one another and cannot be used at the same time. If a CT is provided but line loss compensation is not desired, the set point percent must be set to zero.