Partial Discharge Detection

     The damage of partial discharge to insulation equipment is a slow process that can lead to local damage to the dielectric. Although its energy and space are limited, over time, under certain conditions, it can cause a decrease in the electrical strength of the insulation device, resulting in final insulation damage and even potential power supply safety accidents.

Acoustic imager

     Acoustic imager, as a non-contact non-destructive testing technology, has advantages such as high detection sensitivity, long detection distance, convenient and safe operation, and accurate positioning of fault points. In recent years, it has gradually been widely used in power partial discharge detection.

     In the process of partial discharge, high-frequency pulse signals are usually accompanied by ruptured acoustic emissions, generating ultrasonic signals. Therefore, acoustic imaging devices are gradually being applied in partial discharge detection. Especially in scenarios such as overhead lines and substations, detection and positioning of corona discharge, suspended discharge, surface discharge, as well as discharge types inside and outside ceramic sleeves for various exposed electrical equipment.

     DES-S162Pad is a kind of portable acoustic imager with high technology. It has a 162-channel MEMS microphone with a sampling rate of 192kHz. It can effectively measure ultrasonic signals in ultra-high frequency band. Through the beam-forming algorithm, the acquired acoustic signals are visually processed. Through real-time combination with the video images acquired by the camera head, the ultrasonic signals generated by partial discharge at the fault point are dynamically displayed on the display screen of the imager in the form of visual images, Conduct fixed-point analysis on partial discharge position to make maintenance convenient and safe.

     As a non-contact detection method, the acoustic imager is simple in operation and accurate in positioning. It can help relevant personnel accurately and effectively locate fault points, quickly identify hidden dangers, improve detection efficiency, and save a lot of time and costs.

     DES-S162Pad has been applied and tested in the localization of partial discharge under different scenarios in the power industry, and its use effect has been recognized and praised by users.

Application case

 

 

Case1：The acoustic imager can quickly and accurately locate the partial discharge at the insulating terminal of a pole after the overhaul and troubleshooting of overhead lines in a residential area of a city.
 

 

 

Case2：An aerial cable is aged and damaged, and is located at the location where partial discharge occurs due to defect damage.
 

 

 

Case3：For an urban overhead line, which insulators generate partial discharge can be located, and the severity of partial discharge can be judged by the size of the light spot located.
 

 

 

Case4：A substation in an industrial park uses its high DES-S162Pad to locate and troubleshoot its partial discharge, and multiple partial discharge positions are detected at the same time. The partial discharge can be judged by the size and color of the formed light spot.
The darker the color, the greater the energy, and the greater the partial discharge generated, which can be used as the follow-up key monitoring and maintenance object.
 

 

 

Case5：In case of tripping of residential power supply of an overhead line in a township, the acoustic imaging device was used to troubleshoot the line, and partial discharge was detected at several porcelain insulator terminals. The fault location found through troubleshooting is consistent with that found by professionals in other ways, which further verifies the accuracy of DES-S162Pad for partial discharge location.
 

 

 

 

 
KeyGoTech DES-S162Pad acoustic wave imager not only has the advantages of ultra-high frequency bandwidth, large dynamic range and high signal-to-noise ratio, but also provides PRPD images of acoustic signals generated by partial discharge. The localized partial discharge state can be further confirmed through the PRPD map, and experienced testers can judge the type of partial discharge through the PRPD map.
 
The device has built-in 2.4GHz and 5G local area networks, supports wifi wireless data transmission, and is equipped with post-processing software for one click report export. It also has 128G internal storage space.
 
As a KeyGoTech self-developed sound source positioning product, DES-S162Pad, relying on the company's years of technical accumulation in the acoustic field and practical experience in solving related engineering application problems, makes it more reliable to use in the partial discharge positioning scene. It can quickly locate and image the partial discharge position of the fault point, shorten the fault troubleshooting time, greatly improve the maintenance efficiency, and protect the safe, stable and safe operation of the power grid.