On line Partial discharge monitoring on GIS systems

Description

GISmonitor is a scalable monitoring device for continuous monitoring of gas-insulated switchgear (GIS) using tcontinuous monitoring of gas-insulated switchgear (GIS)rue prarallel, real-time acquisition techniques.Each 8-channel acquisition plug-in board operates fully stand alone,
but can be com-bined with a virtually unlimited number of units, to monitor all PD sensors in one GIS PD monitoring system in parallel. A partial discharge monitoring acquisition rack (PDMAR) carries up to 15 plug-in boards – each with eight channels – providing up to 120 channels.An industrial type PC installed in a partial discharge monitoring control rack (PDMCR) reads all data of the instruments via the high speed fiber optic
LAN  ring,  providing communication redundancy. The GISmonitor indicates with on-board LED’s internal states and alarm conditions. Cabinets are used to accommodate all instruments and the industrial type PC. Each cabinet comes with a standard 19” frame, an uninterruptible power supply, a network switch as well as temperature controlled cooling and heating. Cabinets for indoor applications feature a protection class of IP54, while cabinets for outdoor applications reach a protection class of IP65.

The GISmonitor is designed to suit all currently available UHF sensors for GIS PD monitoring. This includes embedded and external retrofit UHF sensors. A special input protection unit (IPU2) blocks strong transients (VFT). The preprocessing unit FCU2 demodulates UHF signals into a lower frequency band. The user interface software panel of the GISmonitor monitoring system is installed on the local industrial PC and can be installed additionally on any remote computer for data evaluation and diagnosis. Using an administrative setup allows configuring the system and the embedded service program.