Guides

Buying partial discharge sensors on an OEM/ODM basis means judging the supplier on more than price. This checklist covers manufacturing, calibration, customisation, documentation and support for PD sensor sourcing.

SF6 leak detectors use different physical principles, and the right choice depends on the survey type, the target sensitivity and the maintenance budget. This buying guide compares infrared, negative ion capture and halogen technologies.

Handheld PD detectors and online monitoring systems answer different questions: periodic patrol versus continuous trend. This guide compares the two approaches, their costs and their roles, and explains how to combine them.

A combined UHF and pulse current PD sensor couples the electromagnetic wave and the conducted pulse of the same discharge, giving GIS and cable circuits two independent views from one installation. This article explains the HMJ1010-WGP.

An IoT gateway aggregates partial discharge, temperature, gas and arrester sensors, converts protocols, applies edge logic and stores data locally. This article explains the HMJ1020-WJM485 and how it simplifies substation sensor networks.

A ceramic insulator sensor captures three-phase partial discharge and overvoltage signals at the transformer high-voltage side of low-voltage distribution lines. This article explains the HMJ1010-WTX and its role in distribution network monitoring.

Capacitor banks fail when a unit short-circuits or ages, and the failure is often electrical before it is visible. An online monitoring terminal measures voltage and current in real time to catch abnormal conditions early. This article explains the HMJ1011-IA1.

A lightning arrester leakage current monitor tracks the resistive component of MOA leakage current, detects varistor ageing and moisture, and counts lightning strikes. This article explains the HMJ1011-WBJ and how to read its data.

A high-voltage live display PD terminal shows whether a busbar is energised and monitors partial discharge on all three phases, communicating over RS485 Modbus. This article explains the HMJ1010-WCK and its role in switchgear and RMU monitoring.

A spatial UHF sensor monitors the ultra-high-frequency PD signal within a switchgear room or RMU bay, detecting discharge inside panels that have no internal port. This article explains the 300-1500 MHz spatial approach and the HMJ1010-WGK.