Search

• Actual ratio error of phase B CVT is lower than phase A and phase C. • Only the actual phase error of phase B CVT stay the same as calibration results. • The secondary load plays a decisive role to the error characteristics of CVTs. • The actual secondary load in substations should be applied to any kind of calibration of CVTs. The capacitor voltage transformer (CVT) is one of the most important measurement equipment in the power system, and its measurement accuracy is a key factor to ensure the safety of the power system and the fairness of electricity trade. To ensure the steady-state measurement accuracy, the conventional calibration is carried out to CVTs before operating in substations, and the operating CVTs must be calibrated periodically. However, excessive measurement error often occurs to CVTs which have passed the calibrations. In this paper, the reasons for the inconsistency between calibration results and actual measurement errors are proposed. The calibration in the laboratory, on-site calibration and three-phase operating CVTs are simulated according to actual operating conditions. Both the theoretical analysis and simulation results demonstrate that significant differences exist between the actual measurement errors and the calibration results of CVTs. Some experiments corresponding to the simulations verify the conclusions above. Finally, some suggestions to improve the reliability of calibration results are given. [ABSTRACT FROM AUTHOR]

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. • Detect the abnormal HVPTs in real time without power outages. • Applied to any structure where one voltage is measured with at least two HVPTs. • Not affected by voltage fluctuations and active voltage adjustment. • Performance is better than the previous three-phase relation method. • Simulation results and field application results in the substation validate the method. [ABSTRACT FROM AUTHOR]