VENT AS 3U8762 - Caterpillar

In some installations where a single generator is used with long feeder lines to the load, the use of line loss compensation may be advantageous. Line loss compensation is commonly referred to as IR compensation. In the IR compensation mode, a CT must be provided in order to measure the generator current.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.