Partial discharge (PD) is the earliest sign of insulation deterioration in switchgear, GIS, transformers and cables. HUWOR’s online PD monitoring white paper explains how multi-parameter sensing – acoustic emission (AE), transient earth voltage (TEV), ultra-high frequency (UHF) and high-frequency current transformer (HFCT) – converts “periodic outage testing” into “real-time condition awareness”, in both wireless (LoRa) and wired (RS485/Modbus) deployment forms.
Why online PD monitoring
Under manufacturing defects, installation damage, ageing or contamination, equipment gradually develops discharge that can escalate to breakdown, explosion and wide-area outages. Single-parameter monitoring is easily disturbed and prone to false alarms; multi-parameter fusion diagnosis has become the industry consensus. HUWOR combines PRPS/PRPD patterns with machine-learning classification (minimum-distance, neural network, SVM) for discharge type recognition and localisation.
Key products and verified parameters
- 3-in-1 sensor HMJ1010-WAT (AE + TEV + temperature/humidity) – battery life measured at 23.15 years by Jiangsu Electric Power Research Institute
- UHF sensor HMJ1010-WG / WGK – 300-1500 MHz, sensitivity <= 6.5 V/m, for GIS
- HFCT sensor HMJ1010-HFCT – minimum detectable PD <= 50 pC – battery life measured at 18.66 years
- 4-in-1 HMJ1010-WGN, ceramic insulator HMJ1010-WTX, composite HMJ1010-WF (HFCT + sheath circulating current)
- IoT concentrator HMJ1020-WJ and PD IED unit HMJ1020-IED (4-16 channels, >= 100 MHz sampling, 5+ discharge types)
Verified trust evidence
The online PD monitoring system HMJ1030-PD passed CSG 3.0 and State Grid testing (Xuchang KETOP / Xi’an HV Research Institute); products meet CSG 10 kV RMU and State Grid PD sensor requirements; consecutive CSG framework awards in 2025 and State Grid Sichuan/Jiangxi awards in 2026. HUWOR is a national high-tech enterprise established in 2010 with 39 granted patents (11 invention), 63 software copyrights and ISO 9001/14001/45001.
Download the full white paper (PDF) – or browse all HUWOR white papers and technical resources.