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.
Handheld PD Detector or Online Monitoring System: Which Do You Need? Read More »
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.
UHF and Pulse Current PD Sensor: Combining Two Coupling Methods in One Unit Read More »
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.
IoT Gateway for Substation Monitoring: LoRa, RS485, Ethernet and Edge Computing Read More »
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.
Ceramic Insulator Sensor for Distribution Lines: PD and Overvoltage on Three Phases Read More »
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.
High Voltage Capacitor Bank Monitoring: Real-Time Voltage and Current Supervision Read More »
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.
Lightning Arrester Leakage Current Monitor: Online Tracking of MOA Resistive Current Read More »
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.
High-Voltage Live Display PD Terminal: Combining Busbar Indication and PD Monitoring Read More »
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.
Spatial UHF Partial Discharge Sensor for HV Switchgear Rooms and Ring Main Units Read More »
A two-in-one partial discharge sensor combines transient earth voltage and ultrasonic detection in a single unit for switchgear and ring main units. This article explains why the combination covers more defects and how the HMJ1010-AT is installed.
Two-in-One TEV and Ultrasonic PD Sensor for Switchgear and RMU Monitoring Read More »
Oscillating wave testing (OWTS, or damped AC – DAC) stresses a cable with a damped alternating wave and measures partial discharge while the cable stays in serviceable condition. This article explains the method and the HMJ9031 cable oscillating wave tester.