1. The first to adopt computer control technology, controlling PWM pulse width modulation, measurement, protection, and display. The output DC high voltage, current, overvoltage setting, timing, and protection information are displayed on the LCD, and it has an RS232 interface for communication with a computer. The microcomputer-based DC high voltage generator produced by Yangzhou Guoshi Electric Co., Ltd. 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 accuracy. Taking the 100/200kV/2mA two-section as an example, when used as a single section, it can be used as 100kV/4mA for DC high voltage testing of electrical equipment in systems up to 35kV, ensuring measurement accuracy and avoiding overkill; when used as two sections, it can be used as 200kV/2mA for DC testing of zinc oxide arresters at 220kV segmented, 110kV and below, and DC withstand voltage testing of cross-linked cables. It truly serves dual purposes, greatly facilitating on-site use for users.
2. The DC high voltage generator pioneers intelligent poor grounding protection and alarm functions (cannot boost voltage with poor grounding), voltage measurement circuit disconnection protection (instrument cannot boost voltage if the voltage measurement circuit is disconnected), and an emergency stop button, greatly enhancing operator safety during operations. 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 non-grounding protection. Fault sampling uses dedicated sensors with nanosecond response time, and the optical isolation components are also nanosecond-level, with action time generally within 10 microseconds to completely cut off the DC main circuit. The drive signal fast shutdown protection uses dedicated sensors at the output end for sampling, with nanosecond response time. Through nanosecond-level optical isolation components and nanosecond-level analog switches, the drive signal of the power amplifier circuit is cut off within 2 microseconds, ensuring that power devices are not damaged even in the case of output short circuit.
3. It adopts a 30-50kHz high-frequency voltage doubling circuit, pioneering the application of the latest PWM pulse width modulation technology and high-power IGBT devices. Based on electromagnetic compatibility theory, special shielding, isolation, and grounding measures are adopted to achieve high quality, capable of withstanding rated voltage discharge without damaging the machine.
4. The DC high voltage generator uses large voltage feedback, greatly improving voltage stability. A 0.75UDC-1mA trigger button is specially designed for zinc oxide arrester testing, and the frequency is increased to 30-50KHz, significantly reducing the volume and weight of the control box and voltage doubling cylinder, making it more convenient for field use.
5. The DC high voltage generator selects advanced components from the United States, Japan, and other countries, and uses internationally styled series chassis manufactured in Germany, combining practicality and aesthetics.
6. The voltage doubling cylinder of the DC high voltage generator is developed using German technology; the intermediate frequency transformer is specially designed by experts, with small size and large capacity. The base of the voltage doubling cylinder contains a hidden delta-Y support leg, which expands into a Y shape for stable and convenient support during use, and contracts into a delta shape stored inside the base during packing.
7. The fully shielded automatic range-switching high-voltage microammeter equipped with the DC high voltage generator uses a metal shell, and the liquid crystal display is connected to the shell with conductive glass. There are no buttons on the shell, and the test wire and shielding wire are coaxially led out, achieving true full shielding; the ammeter is a 4 1/2 digit display meter, with automatic range switching from 0-200-2000μA, greatly improving the resolution of leakage current.
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