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How to connect DC high voltage generator

time:2020/10/26   source:华天电力  reading:234 time

When the DC high voltage generator is used as a capacitive load, it should be connected with a current limiting resistor


1 The tester should be checked for its integrity before use, the connecting cable should not be broken or short-circuited, and the equipment should be free from damage such as rupture.


2. Place the chassis and the pressure doubler in a suitable position and connect the power cord, cable and grounding wire respectively. The protective grounding wire, working grounding wire and the grounding wire of the discharge rod should be connected to the ground wire of the test product separately (ie One point ground). It is strictly forbidden to connect the ground wires in series with each other. For this reason, DHV dedicated grounding wire should be used.


3. Place the power switch in the off position and check that the potentiometer should be in the zero position. The overvoltage protection setting value is generally 1.1 times the test voltage.


4. No-load boost to verify whether the overvoltage protection setting is sensitive.


5. Turn on the power switch, the red light is on at this time, indicating that the power is on.


6. Press the green button, the green light is on, indicating that the high voltage is on.


DC Hipot Tester.png


7. Gently adjust the potentiometer in a clockwise direction, and the output terminal will start to boost from zero. After reaching the required voltage, record the reading of the ammeter within the specified time, and check the control box and high-voltage output line for abnormal phenomena and noise.


8. Step down and reset the potentiometer to zero, then press the red button to cut off the high voltage and turn off the power switch.

 


9. Perform leakage and DC withstand voltage tests on the sample. After the inspection test is performed to confirm that the tester has no abnormal conditions, the leakage and DC withstand voltage test of the sample can be started. Connect the test product, ground wire, etc., and turn on the power after the inspection is correct.


10. Boost to the required voltage or current. The boost speed is suitable for the test voltage of 3-5kV per second. For the large-capacitance test product, it is necessary to monitor that the charging current of the ammeter does not exceed the maximum charging current of the tester when boosting. For small capacitor samples such as zinc oxide arresters and magnetic blown arresters, first increase to 95% of the required voltage (current), and then slowly and carefully increase to the required voltage (current). Then read the voltage (current) value from the digital display. When you need to measure 0.75UDC-1mA on the zinc oxide arrester, first increase to the UDC1mA voltage value, and then press the yellow button, the voltage will drop to 75% of the original at this time, and keep this state. The current can be read at this time. After the measurement, the potentiometer returns to zero counterclockwise and press the green button. Press the green button when you need to boost again.


If necessary, use an external high voltage divider to compare the voltage on the control box.


11. After the test, reduce the voltage and turn off the power supply.


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