Fault principle and fault handling of DC high voltage generator
- Clicks: 1089 Release time: 2012/5/26
Intelligent DC high voltage generator 1. Product principle ZGF series high frequency DC high voltage generator is based on the requirements of Chinese industry standard ZBF24003-90 "General technical conditions for portable DC high voltage generator". Zui new research, design and manufacture is a new era. Technology products - portable DC high voltage generator, is suitable for power sector, power plant, power plant, scientific research unit, railway, chemical, power plant, etc. for zinc oxide arrester, magnetic blow arrester, power cable, generator, transformer, switch The equipment is subjected to DC high voltage test, which is an ideal replacement for the new century.
ZGF series high-frequency DC high-voltage generator adopts high-frequency voltage doubler circuit, which is the first to apply zui's new PWM high-frequency pulse width modulation technology, closed-loop adjustment, and adopts large voltage feedback, which greatly improves voltage stability. Use high-power IGBT devices with excellent performance and their driving technology, and adopt special shielding, isolation and grounding measures according to electromagnetic compatibility theory. The DC high voltage generator is made of high quality, portable, and can withstand rated voltage discharge without damage.
The main components of ZGF series high-frequency DC high-voltage generator are selected from the advanced technology components of the United States, Germany, Japan and other countries to make the instrument more reliable and stable. The double-pressure cylinder is developed and produced by German technology. The high-frequency transformer is specially made by relevant experts. Design, small size, large capacity, strong overload capacity, easy to field test. Looking ahead, companies will continue to actively explore the market. Taking quality and reputation as the life, constantly improving the level of science and technology, and developing cutting-edge quality products to meet the needs of users, and strive to develop and rebuild the glory of the new century.
Second, the product features 1, smaller size, lighter weight, more beautiful, more reliable, easy to operate, full-featured, easy to use in the field, is the ideal reliable product of the new century Zui.
2, using zui advanced technology, process manufacturing, the first to apply zui new PWM high-frequency pulse width modulation technology, pulse train logic array modulation, using high-power IGBT devices, using high-frequency technology to increase the frequency, the frequency is up to 100kHz, so that the output high voltage Higher stability and smaller ripple factor.
3, according to maintenance-free design, the main components are selected from the United States, Germany, Japan and other countries to import advanced technology components, durable, not afraid of continuous short-circuit discharge to the ground.
4. High precision and accurate measurement. The voltage and current meters are digital display, the voltage resolution is 0.1kV, and the current resolution is 0.1uA. The voltage meter on the control box directly displays the voltage value added to the load test sample. No external voltage divider is needed for use, and the wiring is simple. The instrument has high and low voltage terminals to measure leakage current, and the high voltage end is displayed by a circular shielding digital meter. It is not afraid of discharge shock and has good anti-interference performance, and is suitable for on-site use.
5, high voltage regulation stability, full range smooth voltage regulation, output voltage adjustment using imported single multi-turn potentiometer,
The boosting process is smooth, the adjustment accuracy is high, and the design has coarse and fine adjustment functions. The voltage regulation accuracy is better than 0.1%, the voltage and current measurement error is less than 1.0%, and the pulsation factor is better than 0.5%.
6, negative polarity output, zero start, continuous adjustable, with over voltage, over current, zero return, ground protection, special disconnection protection and other protection functions. The automatic protection circuit has strong functions, perfect protection and reliability, and makes the operation safe. Various technical indicators are superior to the industry standards and superior to similar products.
7, the addition of high-precision 75% VDC-1mA function, making zinc oxide arrester measurement brings great convenience. No one calculation is required with a single touch. There is 75% voltage function button on the control box of the instrument. When the current is raised to 1000uA, the 0.75 button is turned on when the current is raised to 1000uA. At this time, the value displayed by the voltmeter and ammeter is 75% of the data. Immediately after returning the boosted knob to the zero position, the fine voltage knob will be returned to the zero position, and the green button should be pressed immediately to cut off the high voltage and turn off the power switch. Do other tests.
8. Convenient over-voltage setting function, using computer digital setting, as long as the setting button and setting button are pressed at the same time, the setting voltage value can be visually displayed, so that you can operate more freely, and the display value unit is kV. This unit has a time display setting function. Forced power supply forced start function 9, double pressure cylinder can be divided into sections, on-site use, flexible and convenient, one machine is multi-purpose, economical.
10. There are three built-in support feet at the bottom to increase the stability of the double pressure cylinder.
III. Fault check and processing serial number Fault phenomenon Causes of treatment 1 When the power switch is turned on, the green light does not light, and the fan does not turn (some control boxes do not have a fan). 1. The power cord is open.
2. The power fuse is blown. Replace the power cord,
Replace the fuse.
2Press the red button and the red light does not light. The piezoelectric positioner is not zeroed. The potentiometer returns to zero.
3Press the red button to light the red light, the green light does not go out, and the hand releases the red light to turn off. Protection action Overvoltage protection setting is less than 5-10% (full scale). Set the digital dial switch to the appropriate value.
4 Press the red button to light the red light, a boost red light is off, and the green light is on. The high-voltage output is grounded and the sample is short-circuited. Check the output cable and check the test item.
During the boosting process, the red light is off and the green light is on. The test article discharges or strikes through the pressure or overcurrent protection action. Check the test item and reset the setting value.
Fourth, the use of current limiting resistors 1, current limiting resistor function: When the sample breaks down or flashes, it acts to limit the current, so as not to damage the test equipment.
2. Usage: Just screw the M10 nut at one end of the current limiting resistor to the top of the DC high voltage generator and the high voltage output wire bolt. If you want to connect the high-voltage micro-ampere meter (optional SWB-V type meter), just screw the M10 nut on the bottom of the micro-ampere meter to the other end of the current limiting resistor.
3. If the ZGF series DC high voltage generator is used, the test piece is a zinc oxide surge arrester, a valve type arrester and a high voltage switch, etc., and the current limiting resistor can be omitted. That is, for small current and small capacitance samples, the current limiting resistor can be omitted.
4. For large-capacity test samples such as power cables, transformers, and motors, the current-limiting resistors should be connected in series in the high-voltage circuit to test and protect the test equipment.
V. Cautions 1. Please check the connection line and grounding wire repeatedly for correctness. The grounding of each part should be good. It is forbidden to connect the grounding wire in series. Pay attention to safety distance and ensure personal safety.
2. After each test, the boost potentiometer should be returned to the zero position (coarse and fine adjustments are returned to zero position), press the green button, cut off the high voltage and turn off the power switch, and discharge after the Zui.
3. Do not open the instrument without permission, which will affect the warranty of the product. The owner of the disassembly factory is not responsible.
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