CLP(China Light and Power)has ordered more than 100 UltraTEV Monitor systems from EA Technology,to monitor Partial Discharge(PD)activity in 33 and 11kV switchboards serving 2.3 million customers in Hong Kong.
EA Technology,the UK-headquartered power engineering specialist,is supplying the Medium Voltage(MV)equipment in partnership with Siemens Limited,which is providing High Voltage(HV)monitoring systems for CLP's 400kV and 132kV Gas Insulated Switchgear(GIS)assets.
The multi million dollar orders are part of a four year investment programme 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 Partial Discharge(PD)activity in 113 of its 33/11kV switchboards,together with changes in relative humidity and ambient temperature which 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 won the UK's top industrial honour,the Queen's Award for Enterprise:Innovation 2011 and is claimed by EA Technology to be the most advanced substation monitoring system in the world.It includes sensors for measuring internal PD activity in live assets as Transient Earth Voltage(TEV)emissions,together with surface and ambient temperatures,relative humidity and atmospheric pressure,and ultrasonic emissions which characterise 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.
