When choosing a power frequency withstand voltage test device, the following key aspects can be considered:
1. Clarify the parameters of the tested equipment
Voltage level matching: Select the output voltage of the test device based on the rated voltage of the tested equipment, usually providing a test voltage that is a certain multiple higher than the rated voltage. For example, the output voltage of the test device for 10kV cables usually needs to reach 22kV or higher, and it is recommended to leave a 20% margin.
Capacity calculation: The capacity (kVA) needs to satisfy the formula: Capacity=Test voltage x Maximum leakage current. For example, when testing a 35kV transformer (test voltage 70kV, leakage current 100mA), the capacity needs to be ≥ 7kVA.
Frequency and waveform: The standard power frequency withstand voltage test requires an output frequency of 50Hz, with a frequency deviation generally not exceeding ± 0.5Hz, to ensure the accuracy and comparability of the test results. The output voltage waveform should be as close to a sine wave as possible, and the waveform distortion rate should generally not exceed 5%, otherwise it may cause additional damage to the equipment insulation.
3. Focus on automation and intelligence
Automation function: It has functions such as automatic boosting, lowering, and timing, which improves the automation and accuracy of the test, reduces human operation errors, and can automatically generate test reports.
Intelligent operation: using microcomputer control, large screen LCD display, clear and intuitive, and able to display output waveforms and print test reports.
4. Consider device compatibility and scalability
Compatibility: Different types of test samples (such as capacitive loads and inductive loads) need to be matched.
Scalability: Modular design facilitates later upgrading of voltage levels or adding partial discharge detection functionality.
Communication interface: Standard RS485 or Ethernet interface, supporting access to laboratory management system.
5. Evaluate equipment quality and brand
Brand selection: Priority should be given to well-known brands and products with good reputation in the market, which usually have more guarantees in terms of quality, performance, and after-sales service.
Manufacturing process: Check the material and manufacturing process of the main components of the device. High quality materials and good manufacturing processes can ensure the performance and service life of the equipment.
6. Compliance with standards and specifications
Ensure that the testing equipment complies with relevant national and industry standards, such as GB/T 16927.1-2011 "High Voltage Testing Techniques Part 1: General Definitions and Testing Requirements".
7. Consider usage scenarios and portability
On site use: For situations that require testing at different sites, equipment with small size, light weight, and easy portability should be selected.
Environmental adaptability: Consider factors such as temperature, humidity, and altitude in the experimental environment, and select equipment that is suitable for the corresponding environment. For example, it is recommended to choose equipment with a protection level of IP54 or higher for outdoor use.
8. Comprehensive cost-effectiveness
Price is one of the factors to consider when making a purchase, but it should not be the sole criterion. Taking into account factors such as equipment performance, quality, brand, and after-sales service, choose products with high cost-effectiveness.
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
