The main reason for the partial discharge and types

Standard definition of partial discharge (PD) is a kind of incomplete bridge the space between two conductive electrode discharge.Partial discharge in high voltage electrical equipment of various location and medium.Although terminology varies, but usually there are four types of partial discharge, each type have different reasons, and each type has different degree damage.Partial discharge is usually caused by a small defects, and can lead to thousands of tiny repeat discharge, partial discharge will spread and increase over time.In the end, this could lead to catastrophic failure, equipment failure and therebyDangerous arc flash.Most people concern most is safety.

use雷竞技appBureau of Fluke ii910 ultrasonic imagingThe partial discharge detection of distribution facilities.

Partial discharge type

1. Corona discharge:The common forms of partial discharge in charge from the sharp conductor directly onto the surface to air.(this is the cause of sound and rf launch.)From the Angle of damage or security, usually don't have to worry about corona discharge.
2. Arc discharge:Arc discharge is produced by electric breakdown of gas discharge for a long time.When current flows through the air when it or any other usually non-conductive medium produces the plasma.
3. Surface discharge:When discharge propagation along the insulation surface, known as the surface discharge or surface marks.It is probably one of the most destructive type of partial discharge.Pollution and weathering on the surface of the insulator to be two of the most common cause of surface discharge.In high voltage equipment in, when the insulation damage (usually), which is usually caused by poor due to high humidity or maintenance, the discharge will happen.Moisture intrusion is a common cause of surface discharge.
4. The air gap discharge (internal) :This is usually due to cable, the joints of casing, the GIS caused by a defect in a solid insulation.Air gap discharge of insulation destructive, usually will continue to expand, until they lead to complete failure.

Partial discharge detection

In general, the surface by discharge and air gap discharge is industrial high-voltage electrician, power distribution equipment and technical personnel, transmission equipment engineer, original equipment manufacturer (OEM) high voltage engineer is the most concern, should first be tested and repaired.In many cases, the detection and correction of partial discharge is security priorities.In addition to the personal safety, destructive partial discharge may also lead to:

• production
• fire
• Insulation aging
• Grid overload

If in the event of a major damage before early detect the partial discharge, can avoid these problems.There are several ways to detect partial discharge.Partial discharge by ultrasonic, radio frequency (RF) and ultraviolet (uv) radiation method for testing, but so far the use method is not perfect, there are still some shortcomings.These other methods cannot find the partial discharge behind the shell, need a lot of training to use, and lack of ensure quick precision processing and maintenance required, what's more, these methods require the user to enter a potential danger close range of the equipment.

A better way to detect the partial discharge is used雷竞技appBureau of Fluke ii910 ultrasonic imaging.Fluke of innovative SoundSight ™ technology can converts ultrasonic image.With the help of雷竞技appFluke ii910, you can safely to locate partial discharge from a distance, without the need for cumbersome wires or attachments.Within a few minutes after unpacking, you can like a professional to detect partial discharge, easy to learn, easy to use.雷竞技appFluke ii910Can real-time scanning picture to you, so as to obtain abundant data for analysis and reporting.