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Online PD monitoring on rotating machines, transformers, cables, and especially GIS systems. It combines proven technology of the ICMmonitor with new processor technology and embedded hardware capabilities. The hardware core of the system has been optimized for parallel, real time PD acquisition on multiple channels. Any UHF signal can be detected and digitized within micro seconds. A separation of PD events from external disturbances or internal switching pulses is calculated in real time and therefore an effective PD and alarm detection is given.
Each 8-channel acquisition plug-in operates fully stand alone, but can be combined with a virtually unlimited number of units, to monitor all PD sensors in one GIS PD monitoring system in parallel. A full 19" sub-rack carries 64 channels. A remote computer reads all data of the instruments via the high speed Intranet or USB bus. System redundancy is provided due to the local memory storage capacity on each acquisition unit. The GISmonitor indicates with on-board LED’s internal states and alarm conditions.
Two main 19” racks are used to accommodate all instruments and the industrial PC. Each rack comes with a standard 19” frame, non-interruptible power supply, network switch and temperature controlled fans. With each installation multiple monitoring instruments are placed in one 19” rack. All cables from external are feed through the rear side into the rack. Alternatively a customized BNC patch board can be ordered.
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 pulse 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.
This service program takes care of reading data and alarm conditions from the instruments in a predefined time schedule. The service starts as soon as the computer has been turned on and, hence, a valid login on this machine is not mandatory to continue the data acquisition.
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