10‘‘ colour touchscreen: 1805 & 1886 series
Modern digital technology for safety-current-limited applications or those at 500 VA / 200 mA.
Partial discharge (PD) is often an area of concern in a high-voltage or surge voltage test. Both testing methods serve as a basis to measure partial discharges in electrical devices.
What is partial discharge?
As the word “partial” in “partial discharge" describes, in a partial discharge a disruptive discharge takes place in part of the insulation. During a high-voltage test with alternating current, there is no “partial disruptive discharge,” but rather a full disruptive discharge between windings and ground/earth. In practice, it is frequently possible to hear crackling noises during a high-voltage test. If you do hear such crackling noises, no full disruptive discharge is taking place. Instead, you are only perceiving partial discharge effects. These can be measured and evaluated with a partial discharge test.
Where do partial discharges occur, and what consequences do they have?
A partial discharge can occur between windings which touch one another, as well as between the winding and the body. There is a partial insulation problem in one part of the wound material where these partial discharges occur. Such partial discharges (also called partial disruptive discharges) can turn into full disruptive discharges during operation – for instance in a motor. With partial discharge measuring devices from SPS electronic, collected information is used to assess a transformer or a set of transformers, for instance. Defective transformers can then be sorted out in order to avoid failures in the field.
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