Partial discharge measurement technology classification, you know?

Partial discharge measurement methods are divided into two major categories of electrical and non-electric measurements. Electrometry has been widely used for the quantitative measurement of partial discharges.

1. The test principle of the pulse current method is that the test piece produces a partial discharge, and an instantaneous voltage change occurs at both ends of the sample. At this time, a pulse current is generated in the circuit consisting of the test object, the coupling capacitor and the detection impedance. Pulsed current through the detection impedance will produce a pulse voltage at both ends, this pulse voltage acquisition, amplification, display and other processing, you can generate some basic amount of partial discharge, especially partial discharge.

2. Let's take a brief look at the UHF detection method. UHF detection uses UHF antennas to detect electromagnetic waves generated by partial discharges. The sensitivity is high, and the initial position of the discharge source can be determined by the time difference. Its frequency range is generally between 300MHz and 3GHz. It is mainly divided into three types: built-in, external, and omnidirectional.

Scope of application: GIS, switchgear, transformers, cables, space station positioning

3. High-frequency current coupling method, its frequency range is generally in the range of 3MHz-30MHz, mainly divided into: capacitive, inductive (HFCT), applicable equipment, including transformers, cables two.

4. Ultrasonic detection, ultrasonic detection method mainly uses the piezoelectric sensor to convert the acoustic signal into electrical signals to measure partial discharge. Its frequency range is between 20KHz and 300KHz. It can be divided into contact type and non-contact type. The applicable equipment includes transformers, cables, GIS, and switch cabinets.

5. Transient ground voltage detection method, the frequency range of the transient ground voltage detection method is in the range of 10MHz-100MHz, and the applicable equipment includes a switchgear and a transformer.

6. Based on the spatial positioning of the station site discharge rapid inspection technology, it can be divided into two kinds of online positioning system and mobile positioning system. The online positioning system can be detected by an on-line sensor, and the mobile positioning system can be detected by a mobile sensor.

7. Wireless smart sensor technology.

8. Partial discharge optical detection technology.