An online partial discharge tester is a professional device used for real-time monitoring of partial discharge phenomena inside power equipment. Partial discharge detection is of great significance for assessing the insulation condition of power equipment and preventing faults. This article will provide a detailed introduction to the working principle, characteristics, application scope, and purchasing guide of the online partial discharge tester.
Working Principle
The working principle of the online partial discharge tester is mainly based on the physical phenomena and electrical signal changes generated during partial discharge. Common detection methods include:
Pulse current method: Detects the pulse current signals generated by partial discharge.
Ultrasonic monitoring: Detects ultrasonic signals generated in the discharge area.
Transient Earth Voltage (TEV) detection: Detects electromagnetic wave signals caused by changing electric fields.
Ultra-High Frequency (UHF) detection: Detects UHF electromagnetic wave signals generated by partial discharge.
When partial discharge occurs under test voltage, the online partial discharge tester captures these signals through built-in sensors and processes and analyzes them through internal circuits and software.
Main Features
The features of the online partial discharge tester include
Real-time monitoring: Continuously monitors the status of power equipment and promptly detects partial discharge phenomena.
High sensitivity: Can detect weak partial discharge phenomena.
Remote monitoring: Supports remote data transmission and monitoring, facilitating remote management.
Data recording and analysis: Can record detection data and perform analysis through software.
Multiple display modes: Supports various display modes such as ellipse, line, and sine, making it convenient to observe discharge pulses.
Auxiliary functions: Some advanced models also feature auxiliary zero-marking systems, linear/logarithmic dual-function pointer meters, and digital meters.
Strong anti-interference capability: Utilizes digital filtering technology to effectively eliminate on-site interference.
Application Scope
Online partial discharge testers are widely used in the maintenance and repair of power systems, including but not limited to:
Power transformers: Used to monitor partial discharge conditions inside transformers.
High-voltage switchgear: Monitors partial discharge phenomena within switchgear.
Cable terminations: Detects partial discharge at cable terminations.
Instrument transformers: Detects partial discharge in voltage transformers and current transformers.
Power cables: Assesses the insulation condition of cables.
Purchasing Guide
When selecting an online partial discharge tester, the following points should be noted:
Detection sensitivity: Confirm whether the device's detection sensitivity meets the requirements.
Operational convenience: Choose equipment that is simple to operate and has a user-friendly interface.
Data analysis capabilities: Consider whether the device has strong data analysis functions for subsequent evaluation and diagnosis.
Compatibility: Ensure the device is compatible with existing test systems.
After-sales service: Understand the warranty period and service policies provided by the manufacturer to ensure timely support when issues arise during use.
Recommendations for Excellent Online Partial Discharge Tester Manufacturers
Jiangsu Xinya High Voltage Test Equipment Co., Ltd.: Provides high-performance online partial discharge testers suitable for various detection needs.
Zhuoya Electric: Focuses on the R&D and production of online partial discharge testers, with rich experience and a good market reputation.
Wuhan Hezhong Electric: Committed to the manufacturing of online partial discharge testers, with reliable product quality and thoughtful service.
Conclusion
The online partial discharge tester is one of the indispensable tools in power system maintenance, playing an important role in preventing and reducing power equipment faults. By comprehensively considering the above factors, users can select the most suitable online partial discharge tester for their specific needs.
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