Detailed Explanation of the Function and Working Principle of Partial Discharge Detectors
发布时间：2022-05-05
Partial discharge testing is a key experimental procedure for assessing the insulation of power equipment, and parameters such as partial discharge quantity serve as critical indicators for evaluating equipment quality. Partial discharge instruments are also known as partial discharge detectors, partial discharge testers, PD meters, or partial discharge test systems. These instruments receive high-frequency signals generated by partial discharges via a receiver, then employ heterodyning to convert these signals into audio frequencies, allowing users to visually assess the discharge intensity on an electronic display. Leveraging advanced ultrasonic visualization principles and sensing technologies, they present results in digital form, through audible alerts, and via graphical displays, thereby ensuring the safe and reliable operation of GIS equipment.
Partial discharge detectors are commonly used to measure partial discharges in electrical equipment such as transformers, motors, instrument transformers, cables, GIS, switchgear, and surge arresters. They are essential testing instruments for electrical equipment manufacturers, power generation and supply operators, and electrical installation commissioning departments.
The partial discharge instrument measures the partial discharge of the device under test at the test voltage, then couples with a capacitor to transmit the discharge pulse signal to the input unit, thereby generating a pulse. After extracting the pulse signal, it is amplified by a filter‑amplifier and a main amplifier, converted into a visible discharge pulse, and displayed on a pulse‑peak meter. In addition, the test voltage meter, after passing through a capacitive voltage divider, also displays the zero‑crossing reference, enabling the corresponding oscilloscope to capture a zero‑reference pulse and thus reveal the apparent discharge charge of the device under test.
2024/06/29
Contact Us
National Service Hotline: 400-027-8938
Mobile (Manager Chen): 133 9714 9829
Address: Building No. 5, Donghu High-tech Industrial Innovation Base, No. 9 Miaoshan Avenue, Miaoshan Development Zone, Jiangxia District, Wuhan City
Scan it
Follow the official mobile website