What is partial release?
A partial discharge is an incident where two wires create a small electric spark that does not completely show the two wires, hence the term "partial". Voids inside the insulating systems are places where discharges usually occur. The partial discharge, which often occurs, can increase emptiness, wear insulation and eventually damage the system.
The occurrence of partial discharges usually indicates a potentially serious problem with the machine itself. Some of these problems include incorrect assembly and installation and damaged parts. Even new machines can suffer if poor materials are used. Contaminants collected over time could also be the cause of discharges. Old machines can also experience this kind of problem. Partial discharges can also be a common problem with machines that produce a high voltage of electricity. However, bubbles gas is more susceptible to discharge inside the gas and liquid insulation. High moisture level can also increase the appearance of the discharges as water is also very good watersIč.
If the current became too high, a partial discharge would make it through the holiday and could be formed into the "electric tree", spreading its branches. Fixed insulation, such as papers and plastics, would usually display these branches as dark, twisted lines. The problem with partial discharges is that their currents can be so unpredictable, appearing and disappearing so quickly that they cannot be detected if they constantly repeat. One electronic device useful for detection is an oscilloscope that records and shows fluctuating voltage.
electronic waves from partial discharge usually spread from one location. The oscilloscope probe connected to the insulating system chooses a tactual and shows it on the screen as peaks and valleys. Another method of finding partial discharges is through ultrasonic detectors. In addition to electric currents, they also release ultrazVuk that does not hear human ears but can be picked up by sensitive machines. If ultrasonic activity is discovered, then there is a partial discharge in the system.
Another way to detect discharges is to measure "temporary earth tension" (TeV). Drain often leads to another by -product of radio waves, which can be easily detected than ultrasound. The place where TeV is the strongest can be the main place of partial discharges. Many modern sensors and detectors use both TeV and ultrasonic measurements and other technologies to discover any partial discharge exactly and immediately.