DC High Voltage Tester
The DC high voltage tester adopts an intermediate frequency voltage doubling circuit, applies PWM pulse width modulation technology and high-power IGBT devices, and adopts special shielding, isolation, and grounding measures based on electromagnetic compatibility theory. This enables the DC high voltage test to achieve high quality, portability, and the ability to withstand rated voltage discharge without damage. The DC high voltage generator has multiple protection functions, such as: low-voltage overcurrent, low-voltage overvoltage, high-voltage overcurrent, high-voltage overvoltage, zero position protection, and ungrounded protection. The DC high voltage generator uses a dedicated sensor for fault sampling, with an action time at the nanosecond level, and the optical isolation element is also at the nanosecond level. The action time can completely cut off the DC main circuit within 10 microseconds. The push signal is quickly turned off for protection. At the output end, a dedicated sensor is used for sampling, with a response time at the nanosecond level. Through nanosecond-level optical isolation elements and nanosecond-level analog switches, the push signal of the power amplifier circuit is cut off within 2 microseconds in the whole process, ensuring that the power device is not damaged in the case of output short circuit. It refers to the high-voltage power supply mainly used in insulation and leakage detection. Now there is no strict distinction between high-voltage power supply and high-voltage generator. DC high voltage generator is the first in the industry to adopt a segmented structure, which can be used for both high voltage levels and lower voltage levels, while maintaining its accuracy. Taking the DC high voltage generator 100/200kV/2mA divided into two sections as an example, when used as a single section, it can be used as 100kV/4mA, suitable for DC high voltage tests of electrical equipment in systems of 35kV and below, ensuring measurement accuracy and avoiding overkill; when used in two sections, it can be used as 200kV/2mA, suitable for DC tests of zinc oxide arresters at 220kV segmented, 110kV and below, and DC withstand voltage tests of cross-linked cables. It truly achieves one machine with two uses, greatly facilitating the use of on-site users. It is mainly used to study the insulation strength of electrical equipment under DC high voltage, the insulation strength of converter station equipment and insulating materials under DC high voltage, corona and ion flow of DC transmission lines and their effects, and to conduct leakage current tests of AC and DC power equipment. In addition, it can also be used as a power supply for other high-voltage test equipment such as impulse voltage generators, impulse current generators, and oscillation circuits. In other scientific and technological fields, such as physics (accelerators, electron microscopes, etc.), electronic medical equipment (X-rays), industrial applications (exhaust gas precipitation, electrostatic painting, etc.), or electronic communications (television, broadcasting stations), it is also widely used.
The DC high voltage generator adopts intermediate frequency rectification and filtering technology, solving the disadvantages of large ripple coefficient and unstable waveform of power frequency DC high voltage generating devices. The product meets the requirements of the newly promulgated national power industry standard ZBF24003-90 "General Technical Conditions for DC High Voltage Generators DL/T 848.1-2004", and is widely used for DC withstand voltage tests and leakage current tests of electrical equipment. In particular, it is specially equipped with the function of testing the voltage U1mA under 1mA of zinc oxide arrester and the leakage current under 0.75U1mA. It is a new technological product researched, designed, and manufactured recently, suitable for DC high voltage tests on zinc oxide arresters, magnetic blow arresters, power cables, generators, transformers, switches, and other equipment in power departments, factory and mining enterprise power departments, scientific research units, railways, chemical industry, power plants, etc. It is the most ideal replacement product in the new century.
