Abstract: Accurate quantification of refund or compensation electricity due to wiring errors in billing energy metering devices is essential to protecting the interests of both power utilities and electricity consumers. Traditional correction coefficient methods are often inaccurate or inapplicable, particularly under three-phase load imbalance conditions, as the critical parameter—the power factor angle—lacks a reliable determination basis. This study addresses the challenge of compensating for wiring errors under three-phase imbalance by analyzing the specific wiring error types and identifying the corresponding voltage, current, and power factor angle relationships between the first and second metering elements in both erroneous and correct configurations. Leveraging high-frequency metering data, the study constructs 96-point time-series curves of voltage, current, and power factor angle under correct wiring conditions. A cumulative energy fitting approach is then employed to accurately compute the compensation amount. The proposed method enhances compensation accuracy and provides a data-driven framework for error correction in complex load environments.