About Partial Discharge Detectors
When we discuss electrical systems, the detection and management of surface partial discharge (PD) is an important topic in ensuring the reliability and safety of power infrastructure. Surface partial discharge refers to localised breakdowns on the surface of electrical insulation, which can lead to insulation degradation, equipment failure, and even catastrophic incidents if left undetected. Detecting surface PD early is vital for preventive maintenance, minimising downtime, and averting potential hazards.
By leveraging ultrasonic, electromagnetic, acoustic, and optical detection methods, technicians can effectively identify and address surface PD events, ensuring the reliability, safety, and longevity of power infrastructure. Proactive surface PD detection is not just a maintenance task; it's a fundamental strategy for safeguarding electrical systems and optimising their performance in the long run.
Understanding Surface Partial Discharge:
Surface partial discharge occurs when high electrical stress at localised points on the insulation surface exceeds the dielectric strength, resulting in a partial breakdown of the insulation material. This phenomenon often manifests as small electrical discharges, typically in the form of tiny sparks or corona discharges. These discharges emit electromagnetic signals and ultrasonic waves, which can be detected using various diagnostic techniques.
Partial Discharge Detection Techniques:
Several techniques are employed to detect surface partial discharge, each with its advantages and limitations:
Ultrasonic Detection: Ultrasonic sensors are commonly used to detect the high-frequency acoustic emissions generated by surface PD. By analysing the amplitude and frequency characteristics of these emissions, technicians can pinpoint the location and severity of partial discharge activities.
Electromagnetic Detection: Electromagnetic sensors are sensitive to the electromagnetic waves emitted during PD events. By deploying antennas or sensors near the equipment under test, technicians can capture and analyse these signals to identify potential PD sources.
Acoustic Detection: Acoustic sensors are capable of detecting the audible noise generated by partial discharge events. By analysing the frequency spectrum and intensity of these acoustic signals, technicians can assess the condition of the insulation and identify potential areas of concern.
Optical Detection: Optical sensors utilise various optical techniques, such as high-speed imaging or infrared thermography, to detect surface PD-induced phenomena like corona discharges or thermal anomalies. These techniques provide valuable insights into the condition of the insulation and facilitate early detection of potential failures.
Importance of Surface PD Detection:
Detecting surface partial discharge is essential for several reasons:
Preventive Maintenance: Early detection of surface PD allows for timely intervention and preventive maintenance to mitigate the risk of equipment failure and unplanned downtime.
Safety: Surface PD can escalate into severe insulation breakdowns, posing significant safety hazards to personnel and property. Detecting and addressing PD events promptly enhance electrical system safety.
Reliability: Surface PD monitoring helps maintain the reliability and performance of electrical assets by identifying and rectifying potential issues before they escalate into costly failures.
If you have any questions contact our friendly team today - experts are here to advise on the full range of partial discharge detection options.