What is voltage regulation formula?

Voltage (load) regulation is to maintain a fixed voltage under different load.Voltage regulation is limiting factor to decide the size of either conductor or type of insulation.

In circuit current need to be lower than this in order to keep the voltage drop within permissible values. The high voltage circuit should be carried as far as possible so that the secondary circuit have small voltage drop.

% Voltage Regulation = (1.06 x P x L x PF) / (LDF x RC x DF)

Where:

P - Total Power in KVA

L - Total Length of Line from Power Sending to Power Receiving in KM.

PF - Power Factor in p.u

RC - Regulation Constant (KVA-KM) per 1% drop.

RC = (KV x KV x 10) / ( RCosΦ + XSinΦ)

LDF - Load Distribution Factor.

LDF = 2 for uniformly distributed Load on Feeder.

LDF > 2 If Load is skewed toward the Power Transformer.

LDF = 1 To 2 If Load is skewed toward the Tail end of Feeder.

DF - Diversity Factor in p.u