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 220 kV substation.

作为高压输电网络的关键计量设备，高压电压互感器（HVPT）需要人工维护，以确保其运行状态符合相关规定。由于需要停电，因此只能定期进行手动维护，并且在运行期间HVPT的测量误差仍然未知。针对这一问题，本文提出了一种针对高压PTPT测量误差的在线异常检测方法，对复杂电力系统具有较高的适用性。通过利用多总线结构，可以基于连接到同相的HVPT之间的同相关系和HVPT组内的三相关系来检测和定位异常HVPT。此方法是数据驱动的，不会影响电源系统的运行。在220 kV变电站中验证了该方法的有效性。