Guides

Choosing the right partial discharge sensor depends on the equipment type and the defect to be found. This guide compares TEV, UHF, HFCT and ultrasonic (AE) coupling methods, maps each to switchgear, GIS, cables and transformers, and explains when a combined sensor is the better investment.

Built-in UHF PD sensors (e.g. HMJ1010-WGN) couple to the dielectric ports of GIS and transformers for continuous online partial discharge monitoring. This article explains how they work, their 300-1500 MHz detection band, installation requirements and how they compare with external UHF sensors.