The series resonance under Wuhan UHV can help many power workers conduct various power tests more conveniently.
AC withstand voltage test is an important method for evaluating the insulation strength of power equipment. There are various types of equipment required, and the equipment selected may vary depending on the test object and requirements. The following is a clear summary and point representation of commonly used equipment for AC withstand voltage testing:
1、 Main equipment
Variable frequency series resonant withstand voltage test device
Composition: The device mainly consists of excitation transformer, variable frequency power supply, high-voltage reactor, capacitive voltage divider, compensation capacitor and other components.
Features: Suitable for testing with high capacity and low voltage requirements, especially for AC withstand voltage testing of cable long distance specimens. The required capacitance and voltage can be calculated based on parameters such as voltage level, cross-section, and length of the test sample.
Application: Widely used for AC withstand voltage testing of high-voltage main transformers, GIS, generators, transformers, and cables such as 10kV, 35kV, 110kV, and 220kV.
Ultra-low frequency high voltage generator
Features: As a simplified version of series resonance, the ultra-low frequency high-voltage generator has the advantages of small size, light weight, and easy portability. But its testing scope is limited, especially suitable for AC withstand voltage testing of cables of 35kV and below.
Application: Commonly used for AC withstand voltage testing of cables up to 35kV, as well as AC withstand voltage testing of generators.
Power frequency withstand voltage test device
Composition: It mainly consists of a test transformer and a power operation box.
Characteristics: It is one of the most commonly used testing equipment in the power industry, with simple operation and high reliability.
Application: In addition to AC withstand voltage testing, DC withstand voltage testing can also be conducted by adding relevant accessories.
2、 Auxiliary equipment
Discharge rod
Purpose: After the experiment is completed, it is used to discharge the sample and ensure the safe release of charges on the sample.
Voltage divider
Purpose: Used to measure high voltage during the testing process, ensuring that the test voltage is within the specified range.
Insulation resistance tester
Purpose: Used to measure the insulation resistance of the test sample before the AC withstand voltage test, in order to determine whether there are insulation defects in the test sample.
Protect equipment
Including: overvoltage protection, overcurrent protection, discharge protection, breakdown tripping protection, overheating protection and other equipment. These protective devices can ensure that the power supply can be cut off in a timely manner when abnormalities or malfunctions occur during the testing process, protecting the safety of the testing equipment and samples.
3、 Other precautions
Equipment selection: Select appropriate testing equipment based on parameters such as voltage level, capacity, and insulation type of the test object.
Safe operation: During the testing process, strictly follow the safety operation procedures to ensure the safety of personnel and equipment.
Data recording: Timely record various data during the experimental process for subsequent analysis and processing.
In summary, there are various types of equipment required for AC withstand voltage testing, and the selection needs to be based on specific test objects and requirements. At the same time, strict adherence to safety operating procedures is required during the testing process to ensure the smooth progress of the experiment and the safety of personnel and equipment.
