I. DC high voltage generator product introduction
ZGF series high-frequency DC high voltage generator is suitable for the power department, power companies, mining companies, scientific research units, railways, chemicals, power plants and other pairs of zinc oxide arresters, magnetic lightning arrester, power cables, generators, transformers, switches and other equipment Conducted DC high voltage test, took the lead in applying the latest PWM high-frequency pulse width modulation technology, closed-loop adjustment, and adopting large voltage feedback, according to the requirements of the Chinese industry standard ZBF 24003-90 "General Specifications for Portable DC High Voltage Generator", the latest research, Designed and manufactured is a new era of technology products - portable DC high voltage generators. The use of high-performance IGBT devices and their drive technology, and according to electromagnetic compatibility theory, using special shielding, isolation and grounding measures. Enables DC high voltage generators to achieve high quality, portable, and withstand rated voltage discharge without damage.
Looking ahead, companies will continue to actively explore the market. With quality and reputation as its lifeline, we have continuously improved the level of science and technology and developed cutting-edge high-quality products to meet the needs of users and strive to open up and recreate the glory of the new century.
Second, product characteristics
1. It is the most ideal and reliable product in the new century because it is smaller, lighter, more beautiful, more reliable, simpler in operation, full-featured and easy to use in the field.
2. It adopts the most advanced technology and craftsmanship, takes the lead in applying the latest PWM high-frequency pulse width modulation technology and pulse train logic array modulation, adopts high-power IGBT devices, and uses high-frequency technology to increase the frequency with the frequency up to 100kHz, thereby stabilizing the output high voltage. Higher degree, smaller ripple coefficient.
3, according to maintenance-free design, the main components are selected from the United States, Germany, Japan and other countries imported advanced technology components, durable, not afraid of direct short-circuit discharge to the ground.
4, high precision and accurate measurement. Both 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 voltage divider is needed when using, and the wiring is simple. The instrument has high and low voltage side to measure leakage current, and the high voltage end adopts round shield digital meter display. It is not afraid of discharge shock and has good anti-interference performance. It is suitable for field use.
5. High voltage regulation stability, full range smooth voltage regulation, output voltage regulation adopts imported single multi-turn potentiometer, stable lifting process, high adjustment accuracy, and coarse and fine adjustment functions are designed. The voltage regulation accuracy is better than 0.1%, the voltage and current measurement error is less than 1.0%, and the ripple factor is better than 0.5%.
6, DC high voltage generator negative output, zero start, continuous adjustable, over-voltage, over-current, return to zero, ground protection, unique disconnection protection and other protection functions. The automatic protection circuit has strong functions, perfect and reliable protection, and makes operation safe. All kinds of technical indicators are better than the industry standard and better than similar products.
7. Added the function of high precision 75% VDC-1mA to make the measurement of the zinc oxide arrester very convenient. A simple press does not require calculation. The instrument control box has 75% voltage function keys. When doing the arrester test, when the current rises to 1000uA, it will open the 0.75 button. At this time, the value displayed by the voltmeter and ammeter is 75% of the data. Immediately after the boost knob is returned to the zero position, the fine voltage regulator will be returned to the zero position. Immediately press the green button to cut off the high voltage and turn off the power switch. Do other tests.
8, convenient over-voltage setting setting function, using a digital dial switch, can set the voltage value visual display, so that you operate more freely, the display value unit is kV.
9, double pressure tube can be divided into sections structure, on-site use, flexible and convenient, more than one machine, economic benefits.
10. There are three built-in support feet at the bottom, which increases the stability of the pressure tube.
Three, DC high voltage generator working principle diagram
Fourth, ZGF series product specifications and main technical performance
V. Instructions
1, panel components instructions
(1) High-frequency output of DC high-voltage generator and voltage and current measurement cables are quickly connected to multi-core sockets: It is used for the connection of the chassis and the double voltage part. When connecting, simply align the white point on the cable plug with the white point on the socket clockwise into place. When removing, just turn the cable plug counterclockwise. Note: When installing or removing the plug, hold the metal ring of the plug and rotate it. It is forbidden to hold the cable to rotate and pull the cable to rotate so as to avoid disconnection between the plug and the cable.
(2) Digital voltage meter: LCD digital display DC high voltage output voltage in kV, the minimum resolution of ± 0.1kV.
(3) Digital display ammeter: LCD digital display DC high voltage output current, unit uA, minimum resolution of ± 0.1uA.
(4) Power fuse holder: The fuse is 10A.
(5) Power input socket: Single-phase AC 220V±10%, 50Hz. Connect the randomly-configured power cord to the power input socket (with a fuse 10A or a separate fuse block in the socket).
(6) Ground terminal: This grounding terminal is connected to the ground terminal of the doubler cylinder and the grounding of the sample, and then connected to the grounding grid.
(7) Over-voltage setting dial switch: Used to set the over-voltage protection value. The overvoltage setting range is 0.05-1.2 times the rated voltage, and the unit of the value displayed by the dial switch is kV.
(8) Single and double section selector switch (for double barrel), voltage full scale shift (section) switch: when the switch is set to 1, the double pressure tube is a single section, and the voltmeter shows a single section multiple pressure The barrel voltage; when the switch is turned to 2, the double pressure tube is double, and the voltmeter shows the double barrel pressure.
When using the double-double pressure cylinder, align the lower flange white point mark of the upper section with the upper flange white point of the lower section and rotate clockwise until it touches the foot (approximately 30 degrees). The upper and lower sections are electrically connected in place. On the contrary, it was removed. —5—
When making a single knot, please do not forget to put the other end of the cover on top and use the method described above to put it on the top of the next section.
(9) 75%VDC-1mA yellow illuminated button: Valid when red light is on. When the yellow button is pressed after the yellow button is pressed, the output high voltage is reduced to 0.75 times the original, and this state is maintained. This function is specifically for the rapid measurement of zinc oxide arrester 0.75VDC-1mA, press the green button red light, yellow light is off The high pressure cuts off and exits the 0.75-fold state.
(10) Green illuminated button: The green light indicates that the power is on and the high voltage is disconnected. When the red light is on, press the green button, the red light is off and the green light is on, and the high pressure circuit is cut off.
(11) Red illuminated button, high voltage connected button, and high voltage indicator: When the green button is pressed, the red indicator will turn green and the high voltage circuit will turn on when the red button is pressed. It can be boosted at this time. This button is only valid when the voltage regulator potentiometer returns to zero. If the red button is pressed, the red light is on, the green light is still on, but the release button is red and green, indicating that the internal protection circuit is working. At this time, it must be turned off to check whether the over pressure setting dial switch is less than 5% of the full scale and Whether there is any other fault, check it and restart it.
(12) Coarse adjustment voltage potentiometer: The potentiometer coarsely adjusts the multi-turn potentiometer and rotates clockwise to boost, and vice versa to step down. This potentiometer has a control electronic zero-position protection function. Therefore, you must return to zero before boosting. The voltage regulation accuracy is 0.1%kV. After the test is completed, the potentiometer should return to zero.
(13) Fine-tuning the voltage adjustment potentiometer: To adjust the accuracy, the potentiometer is used to fine-tune the multi-turn potentiometer, clockwise rotation is step-up, the voltage step-up is very slow, and vice versa is step-down. Fine tuning is generally used to adjust the voltage accuracy number and do the zinc oxide arrester test, and finally adjust the current accuracy number. After the test is completed, the potentiometer should return to zero.
(14) Power switch: press this switch upwards, the power is turned on, and the green light is on; otherwise it is off. Avoid using this switch to directly turn off the high voltage. When shutting down, first make the voltage coarse adjustment and trimmer potentiometer return to zero, then turn off the power switch.
2, double pressure tube instructions
1.High voltage outlet terminal 2.Pressure cover
3. Double pressure cylinder 4. Upper double pressure cylinder
5. Upper and lower joint flanges 6. Lower section pressure tube
7. Ground terminal 8. Connection cable socket with control box
9. â–³-Y telescopic pin
Six, DC high voltage generator operation steps
1. Preparation before use (1) The integrity of the DC generator should be checked before use. There should be no open circuit and short circuit in the connection cable, and no damage to the device.
(2) Put the chassis and double pressure cylinder in a suitable and safe place, and connect the power cable, cable and grounding cable respectively. The protective grounding wire and the working grounding wire as well as the grounding wire of the discharge wand should be separately connected to the test object's ground wire (ie, a point grounded). It is forbidden to use each grounding wire in series with each other, so as to avoid the formation of counterattack when the breakdown voltage rises and damages the instrument. (See Figure 6) 
Figure 6 Test wiring diagram of the test product and grounding method (3) Check whether the power switch is in the off position, and check that the voltage regulator is in the zero position and the overvoltage protection setting dial switch is set in place. It is generally 1.10 to 1.20 times the test voltage value.
2, no-load boost verification over-voltage protection settings (1) Please look for the power supply is a single-phase AC 220V, 50Hz. Turn on the power switch, then the green light, indicating that the power is connected.
(2) If the red high voltage generator is pressed, the red light will be on, indicating that the high voltage is on.
(3) The adjustment of the coarse and fine adjustment of the piezoelectric positioner is smoothly and clockwise, and the output terminal is boosted from zero. After rising to the required voltage, record the ammeter reading according to the specified time, and check the control box and output cable for abnormal phenomena and sound. If necessary, calibrate the DC high voltage indication on the control box with an external DC high voltage generator high voltage divider.
(4) After the pressure is reduced, the pressure regulator will be returned to zero, and then press the green button to cut off the high voltage and turn off the power switch.
3. Leak test and DC voltage withstand test on the test sample (1) Before doing the load test, install the high-voltage shielded microampere meter on the high-voltage output end of the high-pressure double-pressure tube, and connect the dedicated shielded wire to the micro-ampere On the table and on the test object (for details, see the manual for the high-voltage shielding microammeter).
(2) Check whether the instrument, discharge rod, double pressure cylinder, test product connection line and grounding line are correct, and whether the grounding line connection is reliable. Check whether the high pressure safety distance meets the requirements before starting the high pressure test of the sample.
(3) After confirming that there is no abnormality in the instrument, etc., turn on the single-phase AC 220V power switch. At this time, the green light is on, indicating that the power is on. The DC leakage and DC voltage withstand test of the test sample can be started.
(4) When the red button is pressed, the red light is on, indicating that the high pressure is on and the pressure is to be raised.
(5) The adjustment of the coarse and fine adjustment of the piezoelectric positioner is smoothly and clockwise, and the output terminal is boosted from zero. The step-up rate is preferably 3-5 kV per second to increase the test voltage. For a bulk capacitor, the sample must be slowly boosted during boost, otherwise it may cause voltage overshoot, and it is necessary to monitor that the charging current of the ammeter does not exceed the maximum charging current of the dc generator. When the desired voltage or current is reached, the ammeter and voltmeter readings are recorded for the specified time.
(6) After the test is completed, step down and adjust the coarse and fine adjustment of the piezostat to zero. Then press the green button to cut off the high voltage and turn off the power switch.
(7) After the test is completed, use the discharge rod to discharge the sample for multiple discharges, and then discharge the sample and work on it after discharge. (Please refer to the discharge stick manual for details.)
For small capacitor samples such as zinc oxide surge arresters, magnetic discharge arresters, etc., first increase to 90% of the required voltage (current) with a coarse adjustment, and then gradually increase the voltage to the desired voltage (current) value with a fine adjustment potentiometer. Then read the voltage (current) value from the digital meter. If you want to measure the 75% VDC-1mA of the zinc oxide surge arrester, you should first raise the current value to 1mA and stop the voltage value (in this case, record the voltage and current value). Then press the yellow button, the voltage will drop to the original value. 75% and keep this state. At this point, the microampere meter values ​​and voltage values ​​can be read. After the measurement is completed, adjust the piezo-electric counter to return to zero counterclockwise, press the green button, and press the red button when you need to raise the pressure again.
For large-capacitance samples, the boost should be even slower, and it is necessary to monitor that the charging current of the ammeter does not exceed the maximum charging current of the generator, and the boosting speed must be slowed down. The DC high-voltage generator avoids excessive charging current. After the test is completed, turn the voltage adjustment potentiometer counterclockwise back to zero, then press the green button to cut off the high voltage. At this point, note that the voltage on the voltmeter drops to about 15kV, and the discharge rod can be used for multiple discharges to ensure safety.
4, several measurement methods (1) general measurement, when connected to the line, first connect the sample line is suspended, rose to the test voltage, read the corona and stray current when the empty test I', then connect The test sample rises to the test voltage and reads the total current I1.
Sample leakage current: I0=I1-I′
(2) When it is necessary to accurately measure the leakage current of the test object, a high voltage shielding microammeter should be connected in series in the high voltage circuit, as shown in Figure 7a.
(3) When the grounding terminals of the zinc oxide surge arrester, magnetic discharge arrester, etc. are separable, the DC high voltage generator may also be used in the form of an ammeter connected to the bottom (ground potential side) of the test sample for measurement, but it must also be shielded. Line (see Figure 8a). When the influence of the surface leakage current of the test piece is to be excluded, a bare bare copper wire can be connected to the shield at the ground potential end of the test piece for a few turns (see Figure 8b).
(4) After the DC high-voltage generator is tested, step down, adjust the positioner back to zero, then press the green button to cut off the high voltage and turn off the power switch.
(5) For small-capacity samples such as zinc oxide surge arresters, the discharge is usually performed through a piezoresistor and the time is very short. For large-capacitance test items such as cables and motors, it is generally necessary to wait until the voltage of the test sample self-discharges to less than 20% of the test voltage, and then discharge through the discharge bars. After the sample to be fully discharged and the grounding wire is hung, it is allowed to remove the high voltage lead and replace the wiring work.
5. After the protection operation, the red light is off during use, the green light is on, and the DC high voltage is down, which is the relevant protection action. At this point, follow these steps:
(1) Return the positioner to zero.
(2) Turn off the power switch and the panel indicators are off.
(3) After one minute, the low-voltage capacitor in the standby is fully discharged and the power switch is allowed to turn on again. After the no-load test is resumed and the situation is ascertained, the test may be boosted again.
Seven, DC high voltage generator fault inspection and processing
Eight, current limiting resistor instructions
1. Current limiting resistor function: When the test piece breaks down or flickers, it acts as a limiting current, so as not to damage the test equipment.
2. How to use: As long as the M10 nut at one end of the current limiting resistor is screwed to the top of the double pressure tube of the DC high voltage generator, the high voltage output line bolt can be on. If you want to connect the high-voltage microammeter series (optional SWB-V type table), just screw the M10 nut at the bottom of the microammeter to the other end of the current limiting resistor.
3. If ZGF series DC high voltage generator is used, the sample is a zinc oxide surge arrester, a DC high voltage generator, a valve arrester, and a high-voltage switch and other power equipment. The current limiting resistor may not be used. In other words, current-limiting resistors can be used for small-current, small-capacitance samples.
4. For large-capacity test items such as power cables, transformers, and motors, the current limiting resistor should be connected in series in the high-voltage loop to protect the test equipment.
Nine, matters needing attention
1. Be sure to check the connection line and grounding line correctly. The DC high-voltage generator should be grounded well. It is forbidden to connect the grounding line in series. Pay attention to the safety distance and ensure personal safety.
2. After each test, the leveler should be returned to zero position (rough adjustment and fine adjustment are all back to zero). Press the green button to cut off the high voltage and turn off the power switch, and finally discharge.
3. Do not turn on the instrument without permission. This will affect the product warranty. It is not responsible for the dismantling of the factory.
4. When the instrument is transported, rain erosion should be avoided to prevent collisions and crashes.
X. Security Alerts
1, the use of DC high voltage generator staff, must have a "high-pressure test license" professionals.
2. When using this instrument, the user must follow the “Safety Regulations†section 168 and install two obvious disconnection points before the working power enters the tester. When changing the test sample and wiring, the two power disconnect points should be disconnected first.
3, before the test, please check all test wiring, control box, double pressure tube and the test product ground wire is connected. The test circuit grounding wire should be grounded as shown in this manual (Figure 6).
4, the discharge of large capacitor sample application ZS special discharge resistance rod discharge on the sample. Discharge rod can not be immediately exposed to the sample, should first gradually close the discharge rod sample, to a certain distance air gap began to discharge, there is a hum, when there is no sound discharge rod discharge, and finally directly connected to the ground Discharge.
5. When the DC high voltage is 200kV and above, although the tester wears insulated shoes and is located outside the safe distance, due to the influence of the HVDC ion space electric field distribution, several nearby DCs may have different direct currents. Bit. The test personnel should not shake hands with each other or touch the grounding body by hand. Otherwise, there will be a slight electric shock phenomenon. This phenomenon is more obvious in dry areas and winter, but it is generally not harmful to the human body due to small energy.
7, RX series DC high voltage generator control box power supply AC AC 220V ± 10%, 50Hz. If the power supply is isolated by 1/1 or if spontaneous power is used in the field, the power supply must be connected to earth ground.
Eleven, maintenance, maintenance
1. Verify the availability of the device Before using the instrument, first inspect the appearance of the instrument for damage. After the power is turned on, check whether the instrument header is displayed and whether the display is complete. If the instrument is not used for a long time, check whether the output terminal of the instrument is rusty or aging. Otherwise, it should be cleaned and used in time. Please refer to the "Using Operation" method when using it.
2. After the maintenance of the equipment is completed, clear the wiring on the terminal of the instrument, turn off the power, disconnect the power plug, cover the cover of the chassis, and place it in a dry, dust-free, ventilated, DC high-voltage generator room without corrosive gases.
3. Replacement of the fuse tube The fuse of the instrument is connected with the power socket of the instrument. When replacing the fuse, the power cord must be unplugged first. Use a small screwdriver to pull out the fuse box from above.
Twelve, DC high voltage generator transport, storage
1. When transportation equipment needs to be transported, it is recommended to use the company's instrument packaging wooden box and shock absorbers to avoid unnecessary damage during transportation and to cause unnecessary losses to you.
When the equipment does not use wooden boxes during transportation, stacking discharge is not allowed. The maximum number of stacking layers allowed when using our instrument packing box is two.
When the equipment is shipped, the panel should face upwards.
2. Storage equipment should be placed in a dry, dust-free, ventilated, non-corrosive atmosphere. In the absence of wooden box packaging, stacking emissions are not allowed.
If the device is not used for a long period of time, place moisture-proof items on the bottom of the device when it is placed to prevent the device from getting wet.
When the device is stored, the panel should face upwards.
XIII. DC high voltage generator product set
1, control the chassis 1; 2, high pressure double pressure tube 1 (or 2);
3, power cord 1; 4, high-frequency output multi-core cable 1;
5, spare fuses 10A 3; 6, instructions for use 1;
7, product inspection certificate, warranty card 1; 8, product acceptance test report 1;
9, telescopic discharge rod 1; 10, telescopic discharge rod dedicated ground wire 1;
11, current limiting resistor 1; 12, high pressure shielding microampere meter 1;
13, micro-amps special test line, a set of clips;
Fourteen, optional
1, high pressure shielding microampere meter;
2, various specifications of high-voltage output cables and special lead clips;
3, a variety of specifications are pressure enclosures (for the Bureau to put the test);
4, DC high voltage generator current limiting resistor;
5, various specifications of aluminum alloy box.
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