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Monitoring Device

Der ICMmonitor ist ein Instrument zur kontinuierlichen Online-Überwachung der Teilentladungsaktivität in Hochspannungsgeräten. Das Gerät verfolgt Änderungen der wichtigen Entladungsgrößen zur Speicherung in Trenddiagrammen und zur Auslösung benutzerdefinierbarer Alarme.



Der multifunktionale ICMmonitor mit integriertem Display, komfortablen Trending und einstellbaren Alarmen ist eine ideale Lösung für die kontinuierliche Online-Überwachung rotierender Maschinen und anderer elektrischer Geräte in Industrie- und Versorgungsanwendungen.



Als Kombination von einem Spektrumanalysator, akustischen Detektor und konventionellen Teilentladungsmonitor, ermöglicht der ICMmonitor TE-Messungen auch bei hohem Hintergrundrauschen z. B. an Leistungstransformatoren in Umspannwerken oder Kraftwerken.



Die optionale ICMmonitor-Software ermöglicht die Speicherung der mit dem Gerät erfassten Daten sowie von Screenshots aktueller Messungen.


The ICMmonitor is an instrument for evaluating the condition of medium and high voltage insulation. A built-in four- or eight-channel multiplexer offers scanning of three-phase systems or multiple sensors. It is used for permanent, continuous on-line monitoring of rotating machines, cable systems, and power transformers.

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The ICMmonitor has an easy-to-use push-button interface to navigate on-screen menus displayed on an embedded LCD panel. The LCD modes include a monochrome phase-resolved PD pattern display for classification of defects, a scope-like display showing charge pulses as a vertical line at the phase angle where they occur, a time trending display, and a monitoring display showing bar graphs of two key partial discharge quantities (Qp and NQS). Qp is the apparent charge value of the PD activity, and NQS is the absolute discharge current obtained by integrating the discharge values (summing up the total charge moved and dividing by the time interval, Q/t = [As]/[s]).


The ICMmonitor features various noise handling techniques. The noise gating module can be connected to an antenna or a current transformer to sense and remove noise without losing significant PD data. Another method available is simple windowing, that suppresses phase-stable pulses occuring in the defined windows. Additionally, an appropriate choice of external preamplifiers can limit PD acquisition to a frequency band with less background noise.

Alarms and Trending

Users can set alarm levels of NQS or Qp that will trigger when those values are exceeded. A triggered alarm will appear on the LC display and activate an output relay of the ICMmonitor that can be used to drive a local alarm system. The ICMmonitor also collects and displays PD data over a specified time interval for easy trending and observations of changes in the Qp and NQS levels in the monitored system. Optionally, up to eight DC signals such as temperature or load can be added to this trending.



Observing the frequency spectrum of a harshly disturbed PD signal allows the selection of frequency bands with fewer disturbances. Using this center frequency for a PD acquisition, gives a largely improved signal-to-noise ratio resulting in a clear pattern acquisition. The combination of spectrum analyzer and PD detector within one instrument greatly expands the measurement possibilities when analyzing the insulation systems in a noisy environment.

The ICMmonitor with spectrum analysis comes with a four- or eight-channel multiplexer to directly select the input signal. The instrument provides five different display modes as well as a variety of connectivity options including TCP/IP and USB.