Guides

Zhuhai Huawang Technology Co., Ltd. is listed among the drafting organisations of the power industry standard for high-voltage ceramic capacitance sensors up to 35 kV. Proposed by the China Electricity Council and currently at the final approval stage, the standard specifies the requirements for sensors used in live-line indication, partial discharge measurement, voltage measurement and energy extraction.

Zhuhai Huawang Technology Co., Ltd. participated in drafting Q/GDW 12082-2021, the State Grid Corporation of China technical standard for wireless sensors in the IoT for power transmission and transformation equipment. Published on 2021-12-06, the standard governs sensor types, naming, identification and testing.

A PD alarm is only the start of the value chain. This article explains how to turn partial discharge trends into maintenance decisions: threshold strategy, trend analysis, diagnosis, work planning and asset lifecycle decisions.

A substation monitoring system connects sensors in the switchyard, the switchgear room and the cable tunnels to the control room. This article explains the three-layer architecture – sensors, gateways, platform – and how to design it for growth.

Wind turbine generators face voltage stress, temperature cycling and moisture that drive insulation ageing. This article explains the challenges of PD monitoring in wind turbines and the sensor approach that works in the nacelle.

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.