ICM Compact

ICM Monitor

GIS Monitor

ICM System

MS5000

InsuLogix G2

GISmonitor Portable

Portable Partial Discharge Monitor

Power Diagnostix’s GISmonitor Portable offers parallel real-time PD measurements on up to 40 channels

Power Diagnostix’s GISmonitor Portable is a portable instrument for the temporary monitoring of partial discharge activity on gas-insulated switchgears (GIS) caused by hopping particles, floating potentials, cracks in insulators or spacers, or other degradation in the insulation system. The instrument offers parallel real-time PD acquisition on up to 40 channels and any UHF signal can be detected and digitised within microseconds.  

To eliminate disturbance signals from the measurement, the GISmonitor Portable can also be connected to a disturbance antenna that provides a gating signaI. This allows the instrument to separate PD events from external disturbances in real time, providing effective PD detection. 

The GISmonitor is designed to suit all common UHF sensors for GIS PD monitoring. This includes embedded and external retrofit UHF sensors. A special input protection unit (IPU2) blocks strong transients. The frequency converter unit FCU2 demodulates UHF signals into a lower frequency band for easy submission over longer distances. 

The instrument can be connected to a PC or laptop via a USB port or an optional LAN interface for data evaluation and in-depth diagnosis with the GISmonitor Portable software. This service software provides easy access to view, compare, and analyse the acquired data. The current readings of up to 24 partial discharge sensors of a GIS are visualised in parallel. Each sensor is linked with a specific input channel of the GISmonitor.  

In addition to the standard acquisition of partial discharge versus phase position, the GISmonitor Portable software gives you the ability to acquire partial discharge at DC voltage. In this mode, the partial discharge pulses are displayed against time. 

Every version of the GISmonitor Portable can also be used with the software of the non-portable GISmonitor system. 

FAQs

  • Gas-insulated switchgear/line is of high importance for every grid: With high electric fields in comparatively small spaces, failure can lead to extensive damage and long outages. Temporary PD monitoring with the GISmonitor Portable can help to keep GIS/GIL units in service for longer by early identification of insulation defects and, thus, prevention of asset breakdowns and system failures. 

  • It is always useful to gather as much information as possible in advance. In particular, try to be informed about:

    • The reason for monitoring

    • The size of the GIS and its voltage level

    • The results of previous measurements and maintenance, SAT/FAT…

    • The types of embedded sensors and their connector types

    • The availability of unshielded flanges

    • The size of windows (window diameter, pitch circle diameter, screw size)

    • The age of the components to be tested 

  • An effective noise reduction is required in case that measurements are taken in an environment with ultra high frequency (UHF) disturbance, such as disturbances created by cell phones, corona effects, or similar, because these disturbances can hamper the partial discharge detection. The GISmonitor Portable uses a gating signal picked up by a disturbance antenna, which is used to blind out the disturbances during the measurement.General background noise can be handled by setting a low level discriminator (LLD) in the control software. 

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