The ultra-low frequency high voltage generator is a device specifically designed to generate very low frequency AC high voltage (usually 0.1Hz or lower). It is mainly used for insulation testing in power systems, especially for power frequency withstand voltage tests on test objects with large capacitance such as large generators and cables. Due to the large capacitance of the insulation layer of these test objects, traditional power frequency withstand voltage test equipment requires large-capacity test transformers or resonant transformers, which makes the equipment bulky and costly. However, using ultra-low frequency (such as 0.1Hz) for testing can significantly reduce the capacity requirements of the test power supply, greatly reducing the size and weight of the equipment and simplifying the test procedure.
Here are some key points about the ultra-low frequency high voltage generator:
Working principle: Based on power electronics technology and transformer principles, it converts the input power frequency (50Hz or 60Hz) into the ultra-low frequency range through frequency conversion, and then raises it to the required test voltage via a step-up transformer.
Application fields: Widely used in AC withstand voltage tests for power cables, large high-voltage rotating machines, and power capacitors, as well as in scientific research laboratories, medical institutions, and industrial manufacturing.
Features:
Small size and light weight;
High output accuracy and good stability;
Simple operation and high automation;
Overvoltage and overcurrent protection functions;
High and low voltage closed-loop negative feedback control circuit, output without capacitive rise effect;
Can display output waveform and print test reports.
Operation method: Includes wiring, setting limit parameters (such as output frequency, test time, test voltage, overcurrent protection value, overvoltage protection value), monitoring and adjustment during automatic voltage rise, shutdown, and data saving steps.
With the development of technology, modern ultra-low frequency high voltage generators combine advanced digital frequency conversion technology and achieve microcomputer control, making the entire test process safer, more accurate, and more efficient. At the same time, to ensure the safety and reliability of the equipment, multiple protective measures are also set, such as overvoltage protection and overcurrent protection. In practical applications, correctly selecting and using the ultra-low frequency high voltage generator is crucial to ensure the effectiveness and safety of the test.
