A proposal for Hybrid PD sensor identifying absolute distance from PD source

Abstract

In this paper, the authors proposed a Hybrid PD (AE) sensor which could tell us an absolute distance from PD source. The proposed sensor installed at one fixed position of power transformer tank wall could detect HF signal and ultrasonic one simultaneously. Ignoring faster arrival time of HF signal, an approximated absolute distance from PD source could be derived easily. Moreover, applying time series measurement to the scheme, a pair of PD signals could enable us to discriminate true PD signals from noise spectra. This paper also shows the laboratory experimental results from an oil transformer of 6 kV.

Detection Method of Partial Discharge on Transformer and Gas-Insulated Switchgear: A Review

“…Ultrasonic and ultra-high-frequency (UHF) sensors, configured in various geometries, have shown remarkable effectiveness in detecting the origin of partial discharge (PD) within a specific range, as reported in reference [97]. A proposed approach involves the use of a hybrid PD detection system that combines acoustic emission sensors plus transient earth wire voltage (TEV) [98]. Novel techniques for detecting acoustic emission (AE) involve the use of AE sensors to identify the presence of partial discharge (PD) based A combination of AE and optical techniques involves the use of a Fabry-Perot fiber as an AE sensor for localizing PD.…”

Overview and Partial Discharge Analysis of Power Transformers: A Literature Review

“…The combination of EM and acoustic methods have been used in which ultrasonic and UHF sensors were arranged in different shapes to provide worthy performance to detect PD sources for a particular distance [118]. An example was proposed with the hybrid PD detecting system by transient earth wire voltage (TEV) and AE sensors [119]. Innovative forms of AE detection methods include AE sensors for locating the PD with a signal from EE for the reference time which allows locating and verifying that the signal detected is not the noise [120].…”

Application of Ultra-High Frequency Antenna for Partial Discharge Detection in Oil-Filled Power Transformer: A Review

“…It is also regarded as having a high signal to noise ratio (Kim & Hikita, 2013). Its ability to detect PD under DC condition as well as the capability of pinpointing PD source well within the transformer winding has been noted in (Ishak et al 2013).…”