To know how switchgear partial discharge works, you need to know the partial discharge first. Partial discharge is a phenomenon that occurs when high voltage stress breaks down insulation, causing a partial electrical discharge. This discharge can lead to insulation failure and the eventual breakdown of the equipment, which can be costly to repair and cause significant downtime. Detecting partial discharge early is essential in ensuring equipment reliability, and switchgear is no exception. In this article, we will discuss how partial discharge detection works on switchgear and the different types of partial discharge detection.

Partial discharge detection works by monitoring the electrical activity within the switchgear. The process involves placing sensors within the switchgear to detect any partial discharge activity. The sensors can be permanently mounted, or the switchgear can undergo offline testing. Online testing is the preferred method as it allows for continuous monitoring of the equipment.

Types of Partial Discharge Detection

As for partial discharge monitoring switchgear, here are 5 types in the following:

1. Online Partial Discharge Testing

Online partial discharge testing is the most common method of detecting partial discharge activity in switchgear. It involves permanently mounted sensors that continuously monitor the electrical activity within the switchgear. The sensors are connected to a monitoring system that alerts operators of any partial discharge activity. Online testing is essential as it allows operators to take corrective action before any significant damage occurs.

2. Permanently Mounted Sensors

Permanently mounted sensors are installed within the switchgear and continuously monitor for any partial discharge activity. The sensors are connected to a monitoring system that alerts operators of any activity. Permanently mounted sensors are preferred as they provide continuous monitoring without the need for offline testing.

3. Continuous Online Monitoring

Continuous online monitoring is a type of online testing that involves monitoring the electrical activity within the switchgear continuously. The monitoring system uses advanced algorithms to detect any partial discharge activity and provides operators with real-time data. Continuous online monitoring is preferred as it provides early detection of partial discharge activity.

4. Ultrasonic

Ultrasonic testing involves the use of ultrasonic sensors to detect partial discharge activity. The sensors are placed on the outside of the switchgear and detect any ultrasonic noise generated by partial discharge activity. Ultrasonic testing is preferred for detecting partial discharge activity in enclosed switchgear as it does not require the opening of the equipment.

5. Offline Partial Discharge Testing

Offline partial discharge testing involves taking the switchgear offline and conducting a series of tests to detect any partial discharge activity. The tests involve applying a high voltage stress to the equipment and monitoring for any partial discharge activity. Offline testing is essential as it allows for a more detailed analysis of the equipment’s insulation.

In conclusion, partial discharge detection is essential for maintaining the reliability of switchgear equipment. Online testing, continuously monitoring the electrical activity within the switchgear, is the preferred method of detecting partial discharge activity. Permanently mounted sensors and continuous online monitoring provide continuous monitoring without the need for offline testing. Ultrasonic testing is preferred for detecting partial discharge activity in enclosed switchgear. Finally, offline partial discharge testing provides a more detailed analysis of the equipment’s insulation.