Correction of Phase Voltage Measurements Referenced to an Ungrounded Neutral

Recording voltmeters are often used to provide a permanent record of three phase bus voltages. If the meters are improperly installed, using an ungrounded neutral, the recorded phase to neutral voltages can indicate severely unbalanced conditions, even for a balanced system. The purpose of this paper is to present a Newton-Raphson based iterative solution technique which can be used to reconstruct balanced three phase voltage phasors from unbalanced recorded values which were mistakenly referenced to an ungrounded neutral.