Composition and testing range of ultra-low frequency cable withstand voltage tester

The ultra-low frequency cable withstand voltage tester is a testing instrument based on alternating current, and its composition and testing range are as follows:

1. Composition

The ultra-low frequency cable withstand voltage tester usually consists of a generator, a withstand voltage tester host, test electrodes, cable interfaces, and other parts:

① Generator: mainly used to generate low-frequency and high-voltage signals.

② Voltage tester host: used for signal processing and control.

③ Test electrode: used to apply an electric field.

④ Cable interface: used to connect with the tested cable.

In addition, depending on the specific tester model and purpose, it may also include other modules or components such as touch screens, buttons, remote controls, and other control devices, as well as safety protection devices such as overcurrent protection, overvoltage protection, and short-circuit protection.

2. Scope of testing

The testing range of ultra-low frequency cable withstand voltage tester usually includes the following aspects:

① Input voltage range: usually 0-200kV, used to generate ultra-low frequency high voltage signals.

② Output current range: usually 0~10A (some testers can reach 10mA or higher), used to provide sufficient current to test the voltage resistance performance of the cable.

③ Output frequency range: usually 0.01~0.1Hz (with multiple frequency options of 0.02Hz, 0.05Hz, and 0.1Hz), used to generate ultra-low frequency voltage signals. At this frequency, the cable insulation system is most sensitive to voltage response.

3. Other technical indicators

In addition to the main testing scope mentioned above, the technical specifications of the ultra-low frequency cable withstand voltage tester also include:

① Output voltage stability: It is usually required to be within ± 0.5% to ensure the accuracy of test results.

② Output current stability: It is usually required to be within ± 1% to ensure the accuracy of test results.

③ Test voltage waveform: It is usually required to be a sine waveform to simulate actual working conditions.

④ Output voltage rise time: usually required to be within 1-2 minutes to ensure the efficiency of the testing process.

⑤ Output voltage drop time: usually required to be within 1-2 minutes to ensure the efficiency of the testing process.

⑥ Output voltage holding time: usually required between 10 and 60 minutes to ensure the adequacy of the testing process.

4. Main purpose

The ultra-low frequency cable withstand voltage tester is mainly used to test the insulation strength of high-voltage power cables, cable accessories, cable connectors, transformer windings and other equipment. By applying ultra-low frequency voltage signals and measuring the magnitude of the current, the insulation resistance value of the cable insulation system can be calculated to evaluate the insulation performance of the cable. This type of testing helps to detect insulation weaknesses or faults in cables and determine whether they can withstand the voltage requirements under normal operating conditions.

In summary, the ultra-low frequency cable withstand voltage tester has the characteristics of complex composition and wide testing range, and has a wide range of application value in the power industry.

The ZC-524 B ultra-low frequency and high voltage generator combines modern digital frequency conversion advanced technology and adopts microcomputer control. The boosting, lowering, measurement, and protection are fully automated, and manual intervention can be performed during the automatic boosting process. Due to its full electronic design, it has a small size, light weight, large screen LCD display, clear and intuitive display, and a printer that outputs test reports. The design indicators fully comply with the standards of the power industry and are very convenient to use.

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