The power frequency withstand voltage test device is a key equipment used to test the insulation performance of electrical equipment. It verifies the insulation strength and withstand capacity of the equipment at rated voltage or higher by applying power frequency high voltage. Its core functions, technical features, and application scenarios are as follows:
1. Core functions
① Insulation performance test
By simulating overvoltage scenarios during actual operation, the voltage resistance of equipment insulation materials (such as transformers, switchgear, cables, etc.) is tested to ensure that they do not experience breakdown or flashover under normal operation or fault conditions.
② Preventive testing
Regularly conduct voltage withstand tests on power equipment to detect insulation aging, defects, or potential faults in advance, in order to avoid insulation breakdown accidents during equipment operation.
③ Factory inspection and acceptance
In the production process of electrical equipment, as a necessary link of quality control, ensure that the products comply with national and industry standards (such as GB/T 16927.1).
2. Technical features
① Power frequency high voltage output
The output voltage is usually 50Hz or 60Hz AC high voltage, ranging from several thousand volts to several hundred kilovolts (such as 10kV, 35kV, 110kV, etc.), to meet the testing requirements of equipment with different voltage levels.
② High precision and stability
Adopting advanced voltage regulation and stabilization technology to ensure the accuracy and stability of the output voltage, with low waveform distortion rate (usually ≤ 5%), avoiding additional damage to equipment insulation.
③ Multiple protection functions
a. Overvoltage protection: prevents the output voltage from exceeding the set value.
b. Overcurrent protection: automatically cuts off the power supply when the current exceeds the threshold.
c. Zero position start protection: Ensure that the regulator can only be started when it is at zero position to avoid misoperation.
d. Grounding protection: Ensure that the equipment casing and test circuit are reliably grounded to ensure the safety of operators.
④ Automation and Intelligence
Support functions such as automatic boost, buck, timing, data recording and analysis to reduce human error and improve testing efficiency. Some devices are also equipped with partial discharge detection function, which can monitor insulation defects in real time.
3. Application scenarios
① Power industry
Used for factory testing and regular maintenance of equipment such as transformers, switchgear, cables, insulators, etc.
② Manufacturing industry
As an important tool for quality inspection in the production process of electrical equipment, it ensures that the product meets the insulation performance requirements.
③ Research and testing institutions
Used for insulation performance research of new materials and equipment, as well as third-party testing and certification.
④ Rail Transit and New Energy Sector
Test the insulation strength of rail transit equipment (such as traction transformers) and wind power equipment (such as generators and cables).
4. Purchase suggestions
① Voltage and capacity matching
Select a suitable testing device based on the rated voltage and capacitance of the tested equipment to ensure that the output voltage and capacity meet the testing requirements.
② Safety and reliability
Prioritize selecting products with multiple protection functions and certified by national authoritative institutions to ensure the safety of operators and equipment.
③ Degree of automation
Select devices with automatic boost, buck, data storage, and analysis functions according to testing requirements to improve work efficiency.
④ Portability and Scalability
For on-site testing requirements, portable devices with small size and light weight can be selected; For testing requirements that may be upgraded in the future, devices that support extended functionality can be selected.
5. Typical device types
① Integrated power frequency withstand voltage test device
Suitable for testing voltage levels below 30kV, compact structure, easy to move and operate.
② Split type power frequency withstand voltage test device
Composed of a control box and a test transformer, it is suitable for testing at higher voltage levels and can be flexibly configured as needed.
③ Series resonant voltage withstand test device
By forming resonance between the reactor and the capacitor of the test sample, the capacity of the test power supply is reduced, making it suitable for testing large capacity and high-voltage equipment.
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com
