What are the types of DC high voltage generators?

DC high voltage test generally refers to DC high voltage test, in addition, there are DC high current test, as well as AC voltage and AC current test. They are all test equipment for testing high-voltage equipment or components.

DC high-voltage generator generally refers to DC high-voltage test equipment, which will have different voltage and capacity requirements according to the requirements of the test object and the test voltage level.

It is generally used for DC withstand voltage test on high-voltage electrical equipment such as zinc oxide arresters, power cables, transformers, generators, etc.

Usually there are 40kv 3ma, 60kv 2ma, 60kv 3ma, 60kv 5ma, 80kv 2ma, 10kv 100ma, 120kv 3ma, 120kv 5ma, and so on.

GDZG-300 series DC high voltage generator is a new generation of portable DC high voltage generator designed and manufactured according to the new China Electric Power Waiting Standard DL DC High Voltage Generator General Technical Conditions. High-frequency voltage doubling circuit is adopted, PWM pulse width modulation technology and high-power IGBT device are applied. The output voltage is highly stable and the ripple coefficient is 1% smaller.

Smooth voltage regulation of the full scale, good voltage adjustment fineness, good adjustment accuracy, stability of 1%, voltage and current error of 1% (reading, current error 1 word. The integrated design and high-voltage mopping cable lead out to facilitate on-site testing.

The precautionary test of insulation of power equipment includes AC withstand voltage test and DC withstand voltage test.

Due to the different voltage distribution on the insulation of the equipment under the action of DC voltage and AC voltage, the DC withstand voltage test plays an important role in the dielectric strength test that is difficult to achieve with some AC voltages, and has become an effective supplement to the AC withstand voltage.

DC high voltage generator is the main equipment for DC withstand voltage test.

In order to ensure the accuracy and reliability of the DC withstand voltage test.

DC high-voltage generators require periodic calibration.

According to the inverter frequency, DC high-voltage generators are divided into three categories: power frequency high-voltage generators, medium-frequency high-voltage generators and high-frequency high-voltage generators.

1. Power frequency high-voltage generator. The power frequency high voltage generator works at 50Hz 60Hz, the output linearity is very poor, and in order to produce the penetration and sufficient number of X-rays required for our photography, its volume is generally quite large and heavy. At the same time, because it is a low-frequency waveform, KV has a high volatility and a long period span, which makes it difficult to control the dose (3 ms shorter), which can produce a low dose and produce a lot of useless X-rays.

2. Medium frequency high voltage generator. The working frequency of the medium frequency high voltage generator is between 400Hz-20kHz, and the high-frequency high-frequency waveform is adopted, and the output linearity is significantly improved, which effectively solves the various problems of the power frequency high voltage generator, such as large volume, heavy weight, low dose and other series of problems, which can basically meet the needs of our conventional X-ray photography, but with the development of inverter technology, there is still a lot of room for improvement.

3. High-frequency and high-voltage generator. The inverter frequency of high-frequency and high-voltage generator is 20kHz. With the increase of the inverter frequency, the KV output of the high-voltage generator tends to be a constant straight line, and its KV fluctuation is very small, which can generally be displayed as a straight line in the waveform diagram, and the waveform period is extremely short, and the short time of the control is 1ms, which is much lower than the 3ms of the power frequency high-voltage generator.

Because of its small size, low dose, high imaging quality, large output dose, real-time control and ultra-short-time control, it is the choice of high-voltage generator. It is generally believed that the inverter frequency of the high-voltage generator is greater than 40kHz, which already has the highest accuracy, and no matter how high the khz, the actual contribution to the improvement of high-voltage performance is very small.

DC high-voltage generator is suitable for power departments, power departments of factories and mining enterprises, scientific research units, railways, chemical industries, power plants, etc., to carry out DC high-voltage tests on zinc oxide arresters, magnetic blowing arresters, power cables, generators, transformers, switches and other equipment.

Small size, light weight, easy to operate, complete functions.

The doubling cylinder can be divided into sections, which is convenient for on-site use, multi-purpose and economical.

The selection of imported components, durable, not afraid of continuous direct short circuit discharge to the ground.

ZGF series DC high-voltage generator absorbs the advantages of related products at home and abroad, combines modern scientific and technological achievements, adopts PWM pulse width modulation technology and high-power IGBT devices to improve the voltage regulation accuracy and stability of the instrument.

Ultra-audio full-bridge inverter and pressure doubling rectification, with small ripple coefficient and no noise.

Built-in current limiting protection resistor and voltage divider, voltmeter directly indicates the withstand voltage of the sample.

Non-contact fast protection, voltage zero start, breakdown, overvoltage alarm, to ensure the safety of the equipment.

The high-voltage insulating cylinder is molded from high mechanical strength and high-quality insulating resin, which is lightweight and beautiful, and has strong impact resistance.

According to the theory of electromagnetic compatibility, a special process is adopted to make its technical indicators meet the requirements of the current Chinese standard ZGF24003-90 "General Technical Conditions for Portable DC High Voltage Generators".

Main performance parameters.

High voltage output. Rated voltage: 0 600kV continuously adjustable;

Rated current 5mA;

Rated power 3000W.

Voltage and current indications are digitally and analogue dual displays;

Voltage Measurement Accuracy:

Digital display table fullness) 3 words, analog table fullness);

Current Measurement Accuracy:

Digital display table fullness) 3 words, analog table fullness);

Ripple factor:

Voltage stability: Random fluctuation, less than 5% change in power supply voltage.

Sectional use: single section uses 200kV 10mA;

The second section uses 400kV 7ma;

Three sections use 600kV 5mA.

Power supply: single-phase AC 220V 10%.

Working mode: intermittent use;

The maximum continuous time is 30 minutes at a time.

Working environment: temperature -10 40 ;

Relative humidity is not more than 85% when the room temperature is 25 (no condensation);

Altitude below 1500 meters.

Capacitive load capacity:

There is no limit to the capacitance of the tested product;

The cable can be charged up to 10mA during cable testing.

Product completeness.

A control box.

Medium frequency change one.

Doubling part: one for the upper, middle and lower sections.

One equalizer.

One accessory box.

A set of discharge rods.

One set of current limiting resistors (2 sections).

A set of auxiliary support rods.

A set of dedicated grounding wires.

One power cord.

One intermediate frequency cable.

A measuring cable.

One high-voltage shielded wire.

DC high voltage generators. It is mainly suitable for the power departments of electric power departments, industrial and mining, metallurgy, iron and steel and other enterprises to carry out DC withstand voltage tests on high-voltage electrical equipment such as zinc oxide arresters, power cables, transformers, generators, and high-voltage switches. This paragraph.

The main uses of DC high voltage generators:

1. It is the first company to use computer control technology to control PWM pulse width modulation, measurement, protection and display, display and output DC high-voltage voltage, current, overvoltage setting, timing and protection information on the LCD display, and communicate with the computer with RS232 interface. The microcomputer high-voltage DC generator produced by Yangzhou Guoxi Electric is the first in the industry to adopt a sectional structure, which can be used for both high voltage level and lower voltage level, and keep its accuracy unchanged. Taking 100 200kV 2mA into two sections as an example, it can be used as 100kV 4mA in a single section, which can be used for DC high-voltage test of electrical equipment in 35kV and below systems, which can ensure the accuracy of measurement and avoid large horse-drawn trolleys; When the two sections are used, it can do 200kV 2ma

Use. It can be used for DC test of 220kV sectional, 110kV and below zinc oxide arrester and DC withstand voltage test of cross-linked cable. It truly achieves a dual-purpose machine, which greatly facilitates the use of on-site users.

2. The high-voltage DC generator pioneered the intelligent grounding poor protection and alarm function (poor grounding can not be boosted), the voltage measurement loop disconnection protection (the voltage measurement loop disconnection instrument cannot be boosted), and the emergency stop button, which greatly improves the safety of the operator in the operation process. The HVDC generator has a variety of protection functions, such as: low-voltage over-current, low-voltage over-voltage, high-voltage over-current, high-voltage overvoltage, zero protection, non-grounding protection, etc.

Fault sampling uses a special sensor, the action time is nanoseconds, and the optical isolation element is also nanoseconds, and the action time is generally 10 microseconds to completely shut down the DC main circuit. Through the nanosecond optical isolation element and the nanosecond analog switch, the whole process will cut off the push signal of the power amplifier circuit within 2 microseconds, so as to ensure that the power device will not be damaged in the case of output short circuit.

3. Using 30-50kHz high-frequency voltage doubling circuit, taking the lead in applying the latest PUM pulse width modulation technology and high-power IGBT devices, and according to the theory of electromagnetic compatibility, special shielding, isolation and grounding measures are adopted to make the DC high-voltage generator achieve high quality, which can withstand the rated voltage discharge without damaging the machine.

4. The high-voltage DC generator adopts large voltage feedback, which greatly improves the voltage stability, and the trigger button specially designed for the zinc oxide arrester test also increases the frequency to 30-50kHz, so that the volume and weight of the control box and the pressure doubling cylinder have been greatly reduced, and it is more convenient for on-site use.

It is mainly used for DC withstand voltage, and for the leakage of cables and lightning arresters.

DC high voltage generator is a new generation of portable high voltage testing instrument designed and manufactured according to China's new power industry standard DL high voltage test device general technical conditions Part 1: DC high voltage generator, which is specially used to detect the electrical insulation strength and leakage current of power devices.

This instrument adopts high-frequency voltage doubling circuit, applies new PWM pulse width modulation technology and voltage and current double closed-loop feedback technology to improve power regulation and load regulation, so that the voltage stability is high and the ripple is small. The use of imported high-power IGBT devices and their driving technology eliminates switching interference and realizes the high quality and portability of DC high-voltage generators. The imported high-frequency and high-voltage rectifier diode is selected to make the doubler cylinder more compact and lightweight, and improve the efficiency of the whole machine.

According to the EMI electromagnetic interference and EMC electromagnetic compatibility theory, shielding, isolation and grounding measures are adopted to improve the safety of the whole machine, and it can withstand the rated voltage discharge without damage. The instrument has complete protection functions, including zero protection, over-voltage protection, over-current protection, breakdown protection, and nanosecond special sensors are selected for the protection circuit, which acts quickly and reliably, effectively protecting the safety of personnel and equipment. The digital DIP switch is used for overvoltage setting, which is simple to operate and has high setting accuracy.

The intelligent high-precision function button is added, which is conducive to the testing of zinc oxide arrester.

This instrument adopts an integrated design scheme: the doubler cylinder and the host are placed in a chassis, combined with new technology and new devices, to achieve the advantages of small size, high power, light weight, convenient operation, safety and reliability, and high power output quality, which is an ideal test instrument for the high-voltage testing industry.

This instrument is suitable for electric power, railway, chemical, industrial and mining, metallurgy, steel and other departments to carry out DC withstand voltage test and leakage test on zinc oxide arrester, magnetic blowing arrester, power cable, transformer, generator and other equipment, and can also be used as electrostatic dust vacuum, spraying and other power supplies.

1. The volume of DC high-voltage BAI generator (also called DU AC high-voltage generator).

Zhi is smaller, lighter, more beautiful, DAO is more reliable, easier to operate and fully functional.

2. Manufactured using process technology, pulse train logic array modulation. High-power IGBT devices are used for phase ambiguity control. Thus it has higher output stability, less ripple and frequencies up to 100kHz.

3. Sturdy and durable.

4. Accuracy and precise measurement, the output voltage is adjusted by a single multiturn potentiometer, the step-up process is stable, the adjustment accuracy is high, the instrument has high-voltage terminals and low-voltage terminals to measure the leakage current, the high-voltage terminal uses a spherical shielded digital instrument display, and is not afraid of discharge impact, good anti-interference performance, suitable for on-site use.

5. The voltmeter on the box directly displays the voltage value added to the load test sample, and there is no need for an external voltage divider when using, and the wiring is simple and easy to operate.

6. Output, zero start, overvoltage, overcurrent, zero return, grounding protection, disconnection protection and other protection functions.

7. The DC high voltage generator has the function of 75, it is very convenient to measure the zinc oxide arrester, the instrument control box has the voltage switch function of 75, when the current rises to 1000ua, it will open the 75 of the button, at this time, the value displayed by the voltmeter and the ammeter is 75 of the data, press the knob back to zero, and then the trimming voltage knob back to zero, and immediately put the 75 ammonium button switch in the normal position, and then carry out other tests.

Respondent: Huatian Power.