What are the common methods of partial discharge detection

1, ultrasonic detection method: the use of ultrasonic detection method for partial discharge detection, is now one of the methods in the field of preventive maintenance. Due to the ultrasonic method by the electrical interference is small as well as it is widely used in the localization of partial discharge, people on the ultrasonic method of research is more in-depth. By listening to the sound to determine the location of the local discharge generated and the distance, to realize the monitoring of electrical local discharge.

2, chemical detection method: when partial discharge occurs in the transformer, a variety of insulating materials will be decomposed and destroyed, resulting in the generation of new products, through the detection of the composition and concentration of the products, you can determine the state of partial discharge. At present, this method has been widely used in the online fault diagnosis of transformer. Different types of faults, different degrees of faults, and different compositions and concentrations of gases, and the pattern recognition system thus established can realize the automatic identification of faults. However, until now, there is still no uniform judgment standard. Because it is more sensitive to the discovery of early latent faults, but can not reflect the sudden failure.

3, UHF partial discharge detection: due to the inadequacy of the traditional detection methods, followed by the emergence of a new detection method of UHF detection. Transformer partial discharge generated by the ultra-high frequency (300-3000MHZ) signal to achieve the power transformer local insulation discharge detection and localization, and anti-interference.

4, the use of ultra-high frequency detection of transformer partial discharge main advantages are: First, the local discharge pulse energy is almost proportional to the bandwidth, when only consider the detection of thermal noise on the sensitivity of the components, with ultra-frequency broadband detection has a higher sensitivity; Secondly, the study shows that in the use of transformers on-site, the substation's background, noise, and air corona generated by the electromagnetic interference frequency is generally very low, the wide frequency method can be used to effectively detect and locate the power transformer insulation discharge. Available broadband method for its effective suppression, with narrow-frequency method to distinguish it from the local discharge signal. It can be seen, with the appropriate UHF sensor can measure the real transformer insulation in the nature of partial discharge and physical processes.

Partial discharge detector

Respondent: Sanxin Electric Power