PARTIAL DISCHARGE (PD) ALARM TOOL FOR ONLINE DETECTION OF PARTIAL DISCHARGES IN MEDIUM VOLTAGE ACCESSORIES: TECHNOLOGY AND CASE STUDIES

This month’s Featured Technical Paper is from the Proceedings of the 2020 International Conference of Doble Clients. The paper is titled: Partial Discharge (PD) Alarm Tool for Online Detection of Partial Discharges in Medium Voltage Accessories: Technology and Case Studies.

Abstract

PD Alarm is a device that offers a quick and safe method of detecting and locating partial discharges (PDs). The PD Alarm device includes two antennas that pick up the signals, an acquisition module, a processor, and a module to produce an alarm after detecting a partial discharge. The method includes the detection of two magnetic fields with the two sensors, the digitization of the two received signals, the processing of the two signals and the generation of a signal resulting from the processing. The processor is configured to issue alarm instructions if the resulting signal has a property representative of a partial discharge and remain in a standby state otherwise (ready for signal detection). PD Alarm is able to detect the inversion of polarity of a PD produced between the two antennas at a range of operation below 30 MHz and centered around 18 MHz [1]. This low band frequency allows a much more standard and cheaper electronics for all necessary treatments than at higher frequencies. The development of antennas is also one of the keys to success.

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