A simulated partial discharge tester is a professional device specifically used to detect partial discharge phenomena in power equipment. By simulating the test method of real partial discharge, this instrument can help maintenance personnel promptly discover potential fault points and prevent sudden accidents in the power system. This article will detail the working principle, technical characteristics, and application scope of the simulated partial discharge tester.
Working Principle
The working principle of the simulated partial discharge tester is based on simulating the electromagnetic wave signals generated by partial discharge. By using a calibration pulse generator to produce a specified waveform pulse voltage, and through a calibration capacitor, simulated discharge charge is injected into the test object, thereby simulating the actual partial discharge situation. The tester captures these simulated signals, processes and analyzes them, helping technicians assess the insulation status of the equipment.
Technical Characteristics
The main technical characteristics of the simulated partial discharge tester include
Simulated discharge: Capable of simulating different types of partial discharge to test the equipment's response to various discharge conditions.
Accurate positioning: Can accurately determine the location of partial discharge.
Easy operation: Detection can be performed with simple connections and settings.
High sensitivity: Can capture weak simulated signals.
Multi-mode detection: Usually equipped with multiple sensors, such as ultrasonic sensors, earth wave sensors, ultra-high frequency sensors, etc., enabling detection in multiple modes.
Data recording and analysis: Built-in data recording function facilitates later data analysis and evaluation.
Technical Parameters of the Calibrator
The main technical parameters of the calibrator used in the simulated partial discharge tester include:
Calibration pulse waveform rise time: The time for the pulse voltage to rise from 10% to 90%.
Decay time: The time for the pulse voltage to drop from the peak value to a certain percentage.
Calibration pulse peak value: The maximum value of the pulse voltage.
Calibration capacitance value: The capacitance value used to calibrate the sensitivity of the test system.
Application Scope
The simulated partial discharge tester is widely used in multiple fields of the power system, including but not limited to:
Voltage transformers: Detecting partial discharge inside voltage transformers.
Current transformers: Evaluating the internal insulation condition of current transformers.
Power transformers: Monitoring partial discharge conditions inside transformers.
GIS equipment: Detecting partial discharge in GIS (Gas Insulated Switchgear).
Cable terminations and joints: Evaluating partial discharge phenomena at cable terminations and joints.
Detection Steps
Preparation: Ensure all equipment is powered off and grounded.
Connecting test instruments: Correctly connect test leads and sensors according to the instrument manual.
Setting parameters: Set parameters according to the specific conditions of the equipment under test.
Starting measurement: Start the measurement procedure according to the instrument operation guide.
Data analysis: Collect data and analyze it through software.
Result evaluation: Evaluate the health status of the equipment based on data analysis results.
Selection Criteria
When selecting a simulated partial discharge tester, the following points should be considered:
Detection frequency range: Choose a product that can cover the target frequency range.
Sensitivity: Ensure the instrument can detect weak simulated signals.
Portability: Consider the weight and size of the instrument for easy carrying and on-site operation.
Battery life: Choose an instrument with good battery life to support long-duration testing.
Data recording and analysis functions: Confirm whether the instrument has the function to record detection data and perform subsequent data analysis.
User-friendly interface: Choose an instrument that is simple and intuitive to operate, facilitating quick on-site use.
Conclusion
The simulated partial discharge tester plays an important role in the maintenance of power equipment due to its unique detection principle and technical advantages. By regularly using the simulated partial discharge tester for detection, it can effectively prevent failures in the power system and ensure the safe and stable operation of power facilities.
