On-line anomaly detection for the measurement error of HVPT in the multi-bus structure

As the key metering equipment of the high-voltage transmission network, the high-voltage potential transformer (HVPT) needs manual maintenance to ensure that its operating status complies with relevant regulations. Due to the requirement of power outages, the manual maintenance could only be conducted at regular intervals and the measurement error of HVPT remains unknown during the operation. To address the issue, this paper proposes an on-line anomaly detection method for the measurement error of HVPT with high applicability to the complex power system. By taking advantage of the multi-bus structure, the abnormal HVPTs can be detected and located based on the in-phase relation between the HVPTs connected to the same phase and the three-phase relation within the HVPT groups. This method is data-driven and will not affect the operation of the power system. The effectiveness of the proposed method is verified in a 220kV substation.