PD Applications - Switchgear Systems (AIS/GIS/GIL)

On-line monitoring

The new design of the GISmonitor combines the proven technology of the ICMmonitor with new processor technology and embedded hardware capabilities. The hardware core of the system has been fully redesigned and optimised for parallel, real-time partial discharge acquisition on multiple channels and any UHF signal can be detected and digitised within microseconds.

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Online Monitoring

PD events are separated from external disturbances or internal switching pulses thanks to the advanced GISmonitor software. Additionally, each acquisition unit is a standalone instrument able to monitor all PD sensors in one GIS PD monitoring system in parallel. A remote computer retrieves all data from the instruments via the high speed fibre optic LAN.

The key features of the GISmonitor are:

Real-time parallel PD acquisition on all channels
Parallel reading of PD peak values, PD scope amplitudes, and PD patterns
Parallel 8 x 8 x 16 bit coloured PD pattern acquisition
Automatic noise separation techniques via intelligent software analysis
Separate gating input channel
Automatic alarm detection system via software
PD trending and PD pattern information available with the remote computer
User-friendly software panel including a customised GIS overview diagram indicating all sensors and its current activities
Additional analysis and trending panel displaying Qp, NQS, scope, and pattern information of each channel at every time stamp

Alarm event list indicating peak levels, PD patterns, and trend information
Direct access to all history files and to current readings
Typical PD failure database provided (ICMexpert software)
System redundancy in storage and LAN
Wide temperature operation range
External interfaces to IEC61850 or other overall monitoring systems available on request
Low maintenance and user-friendly monitoring system
Extensibility and scalable

This on-line PD monitoring system has been designed to fit all currently known UHF sensors available on the market for GIS systems. Embedded UHF sensors are as well-suited as retrofitted external ones. Strong transients will be blocked by a special input protection unit (IPU2B). All other common UHF signals are converted into lower frequencies by a special pre-processing matching unit (frequency converter unit, or FCU2).