T&D World Magazine
China Light & Power Orders 100+ Partial Discharge Monitors

China Light & Power Orders 100+ Partial Discharge Monitors

China Light and Power has ordered more than 100 UltraTEV Monitor systems from EA Technology, to monitor partial discharge activity in 33- and 11-kV switchboards serving 2.3 million customers in Hong Kong.

EA Technology, the UK-headquartered power engineering specialist, is supplying the medium-voltage equipment in partnership with Siemens Limited, which is providing high-voltage monitoring systems for CLP’s 400-kV and 132-kV gas-insulated switchgear assets.

The multi-million dollar orders are part of a four-year investment program by CLP to enhance system efficiency and reliability, by basing the maintenance of assets on measurement of their actual condition.

CLP will use the UltraTEV Monitors for continuous detection, measurement and recording of internal PD activity in 113 of its 33/11kV switchboards, together with changes in relative humidity and ambient temperature that affect PD.

The monitors will automatically feed condition data about individual assets into an integrated asset management system, which will enable CLP to determine their health and risk of failure. The results will be used to prioritise emergency interventions as well as plan medium and long term maintenance work more efficiently.

The UltraTEV Monitor includes sensors for measuring internal PD activity in live assets as transient earth voltage emissions, together with surface and ambient temperatures, relative humidity and atmospheric pressure, and ultrasonic emissions that characterize surface PD. PD in cables is measured using a radio frequency sensor. It also includes data analysis software and is fully web-enabled, with an automatic alarm function to warn of critical PD activity.

Founded in 1901, CLP serves 80% of Hong Kong’s population, with a network of more than 13,550 substations and 13,900 km of cables.

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