Partial Discharge Tester with Micro Wave Sensor
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Partial Discharge Tester High efficient PD test system Applied voltage PD characteristic graph 3 AC high voltage source 5 kV/100 mA 3 Microwave PD sensor with patch antenna In this new and worldwide unique insulation test system, a digital programmable AC high voltage supply is combined with a simple to use PD test system, which does not demand for special conditions of the test environment. Classical PD systems with capacitive signal coupling typically need a "Faraday cage" for the OUT which is not an economical solution i.e. under production conditions. Through the special filter method with narrow band filter in 1.7 GHz band, all relevant noise frequencies are carefully eliminated and the PD signal is recorded via patch antenna, which detects the accompanying micro waves, and the evaluation unit with graphical user interface.

Visualisation of the PD effects The signal of the AC source is displayed in real time which allows phase resolved display of the PD characteristic. Several graphical screens allow pin-pointing and complete evaluation of the PD effects and the condition of an insulation. Stable testing at very high repeatability Since the non-contact patch antenna only detects the microwaves which appear during PD and through the active high pass filtering in GHz range, the recorded signal is practically noise free and allows evaluation with high sensitivity. Therefore it is usable under nearly all...