Corona Detection Using A Corona Partial Discharge Detector

Corona discharge is an important safety threat and needs to be detected before it causes equipment failure. Using an UV digital camera, it can be located and identified with high accuracy. This paper compares the sensitivity of a DSLR and a sonic camera to detect corona discharges. It also analyzes the behavior of these cameras under pitch-black conditions.

Detection Of Corona

Corona is a dangerous phenomenon that can cause damage to high- and medium-voltage electric power systems. It generates ultraviolet radiation, ozone, acids and electrical discharges, deteriorates insulators and leads to equipment failure. It is often difficult to detect and locate because it does not produce heat and is not visible with a thermal camera. However, a new type of imaging device allows corona effect camara and tracking conditions to be detected and located in real-time, allowing these problems to be identified early during inspections.

This device uses an image sensor that consists of a matrix of photosensitive elements, typically photodiodes, which are charged by light photons. These sensors convert the photoelectrons into a signal that is proportional to the intensity of the light. This signal is then used to reconstruct an image of the environment, including the location of the discharge site. It has been shown that there is a direct correlation between the amount of energy released by the electrical discharge and the image intensity.

Detection Of Arcs

Corona cameras make it possible to locate and identify PD sources that are invisible to the naked eye. Using these cameras, engineers can locate the source of a problem and prepare an inspection report. This prevents costly failures and saves time. Corona detection is not just used in electrical equipment, but also in medical and household appliances. The device can detect and record the corona effect, which is generated by the buildup of electric charge on specified surfaces. This is a dangerous phenomenon and can lead to streamer discharges and other problems.

To identify the corona configuration, the component is tested at its nominal test voltage over positive polarity (+DC). Then, it is analysed whether the pulse sequence has a stable repetition. If the pulse sequence is consistent, it is likely to be intermittent corona or Trichel (configuration IV). If the pulses are random and sporadic, they may be streamer corona.

Detection Of Arcing

Corona discharges can cause a variety of problems in electrical equipment. They can create ultraviolet radiation, ozone, acids, heat, and mechanical erosion through ion bombardment. These byproducts damage insulation and reduce the reliability of high-voltage electrical systems. In addition, they can cause fires, explosions, and catastrophic failure. In order to avoid these problems, it is important to detect corona early in the process of failure.

Using digital image sensors, it is possible to detect and locate the site of partial discharges in high-voltage equipment. These devices are relatively simple to use and offer a significant advantage over traditional methods. This paper focuses on evaluating the performance of two different sensors for detecting and locating corona discharges. The test results were compared for three geometries of electrode gaps, 50 Hz ac and positive/negative dc power supplies, and at various distances between the discharge site and the sensor. The correlation between the charge (Qi+1) and time to discharge (Dti+1) plots was also studied.

Detection Of Sparks

The partial discharge detector effect is a current flow caused by the ionization of air molecules near an energized electrode. This ionization creates plasma, which contains electrically charged particles that carry the discharge to locations of lower potential. This process can damage equipment and lead to a loss of power. It can also cause a noxious smell that is similar to ozone or nitrous oxide, which are dangerous when mixed with water vapour. A corona camera is a tool that can detect and locate corona sites. It uses a dual-band imager that acquires images in the UVC and visible bands. The UVC image is then superimposed on the real image to allow for the location of the discharge site.

Corona cameras are a valuable tool for detecting and locating partial discharge (PD) in high-voltage insulation systems. However, many existing PD detection methods are too expensive or complex to be practical in field applications, and they do not allow for direct location of discharge points.

Conclusion

Corona effect camera is a device which records highly sensitive UV radiation in the solar blind range. It is used to detect corona effects on DC electrical components to prevent their failure. The component is tested at its nominal testing voltage over positive polarity (+DC). If PD is recorded, the plot of charge (Qi+1) vs time to discharge (Dti+1) is analysed.