Why Does a Generator Produce Unbalanced Voltage?

Checking three phase diesel generator voltage during load testing

When a generator produces unbalanced voltage, I first check whether the voltage is already unbalanced at no load or only becomes unbalanced after load is applied. If the three-phase voltage is balanced at no load but becomes unbalanced under load, I normally check phase loading, cables, terminals, breaker and ATS connections first. If the voltage […]