Overview of the Features of a User-Friendly, Fully Functional DC High-Voltage Generator

发布时间：2021-12-08

The DC high‑voltage generator employs a medium‑frequency voltage‑doubling circuit. This new‑generation device incorporates PWM pulse‑width modulation and high‑power IGBT technology, and, in accordance with electromagnetic compatibility principles, implements specialized shielding, isolation, and grounding measures. As a result, the DC high‑voltage test system delivers superior performance, is highly portable, and can withstand rated‑voltage discharges without damage.

The DC high-voltage generator features multiple protection functions, including low-voltage overcurrent, low-voltage overvoltage, high-voltage overcurrent, high-voltage overvoltage, zero‑position protection, and non‑grounding protection. The fast‑acting trip‑protection circuit employs dedicated sensors at the output for sampling, with a response time on the order of nanoseconds, implemented via nanosecond‑level opto‑isolation components and nanosecond‑level analog switches.

The entire process cuts off the drive signal to the power amplifier circuit within 2 microseconds, ensuring that the power devices remain undamaged even in the event of an output short circuit. This refers to high-voltage power supplies primarily used for insulation testing and leakage current detection; today, there is no strict distinction between high-voltage power supplies and high-voltage generators. The DC high-voltage generator was the first in the industry to adopt a modular design, enabling it to operate at both high and lower voltage levels while maintaining consistent accuracy.

Taking the 100/200 kV/2 mA configuration with two sections as an example, when operating in a single‑section mode, it can deliver 100 kV at 2 mA, suitable for DC high‑voltage testing of electrical equipment in systems up to 35 kV. In this mode, measurement accuracy is ensured, avoiding the use of an oversized device for a small‑scale application. When both sections are connected, the unit can provide 200 kV at 2 mA, enabling DC testing of 220 kV sectional arresters, as well as DC withstand tests on zinc‑oxide surge arresters rated at 110 kV and below, and on cross‑linked polyethylene (XLPE) cables.

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