On-Site Calibration Method of Online Partial Discharge Sensors Based on Comprehensive Calibration Device
Huan Li, Zheng Niu, Deliang Cheng, Ting Mao, Chenguang Ai, Xin Oian, Fenghai Li, Dongmin Li · 2024
Ultrasonic sensors and high-frequency current transformers are commonly used sensors for online monitoring of partial discharge of transformers. However, differences in their models and uncertainties in the production process lead to differences in the perceived values of the same signal by different sensors. Therefore, it is very important to uniformly calibrate the sensors during on-site installation. This paper invents an accuracy calibration method suitable for on-site use for ultrasonic and highfrequency sensors. On this basis, an integrated transformer online monitoring comprehensive calibration device has also been developed. This device can not only calibrate different types of sensors, but also synchronously verify the alarm performance of online monitoring equipment to improve the reliability of equipment operation. This set of technical solutions was actually applied during the installation of an online monitoring terminal for a UHV transformer, providing a reliable guarantee for the safe and stable operation of UHV equipment.