Guides

Transformers fail through electrical, thermal and chemical mechanisms that a single test cannot cover. This article explains how dissolved gas analysis, partial discharge monitoring and temperature sensing work together as one diagnostic strategy.

Most cable failures start at joints and terminations, where field work and stress concentration make defects likely. This article explains why joints fail, how PD reveals the defect, and which detection methods work at each location.

Ring main units are the most numerous switchgear in urban distribution networks and the least monitored. This article explains how TEV, ultrasonic and combined sensors bring RMU monitoring to the distribution grid at a per-unit cost that scales.

The cost of a PD online monitoring system is dominated by the number of monitored points, not the software. This article breaks down the cost structure, the hidden costs and the ROI case for substation PD monitoring.

Power cable partial discharge can be measured by oscillating wave testing, HFCT sensors and acoustic methods – each answering a different question. This article compares the three techniques and shows how to combine them in a cable maintenance programme.

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.