News Details

　　DC High Voltage Generator Manual and Usage Instructions. The following are the routine operating steps for the DC high voltage generator, for reference only:

　　1. Preparation before use

　　(1) Before using the DC generator, check its integrity. The connecting cables should have no open circuits or short circuits, and the equipment should have no damage such as cracks.

　　(2) Place the control box and the voltage doubling cylinder in a suitable safe position, and connect the power cord, cable, and grounding wire respectively. The protective grounding wire, the working grounding wire, and the grounding wire of the discharge rod should all be separately connected to the ground terminal of the test object (i.e., single-point grounding) and ensure good grounding. It is strictly forbidden to connect the grounding wires in series with each other to avoid the ground potential rising and causing a back strike when breakdown occurs, which could damage the instrument.

　　(3) Check that the power switch is in the off position, and check that the voltage regulator potentiometer is at zero. Set the overvoltage protection setting dial switch to an appropriate position, generally 1.10 to 1.20 times the test voltage value.

　　2. No-load voltage rise to verify the overvoltage protection setting value

　　(1) Please confirm that the power supply is single-phase AC 220V, 50Hz. Turn on the power switch; at this time, the green light is on, indicating that the power is connected.

　　(2) Press the red button; then the red light is on, indicating that the high voltage is connected.

　　(3) Slowly adjust the voltage regulator potentiometer clockwise; the output terminal starts to increase voltage from zero. The voltmeter displays the voltage (kV) value on the load test object, while the ammeter displays the sum of the current flowing through the test object and all leakage currents, with current in microamperes (uA). After rising to the required voltage, record the ammeter reading for the specified time, and check the control box and output cable for any abnormalities or sounds.

　　(4) To reduce voltage, return the voltage regulator potentiometer to zero, then press the green button to cut off the high voltage and turn off the power switch.

　　3. Conduct leakage and DC withstand voltage tests on the test object

　　(1) Before conducting the load test, install the high-voltage shielded microammeter on the high-voltage output terminal of the voltage doubling cylinder, and connect the dedicated high-voltage wire to the microammeter and the test object respectively.

　　(2) Check whether the instrument, discharge rod, voltage doubling cylinder, test object connection wires, and grounding wires are correct, whether the grounding connections are reliable, and whether the high-voltage safety distance meets the requirements. Only then can the high-voltage test on the test object begin.

　　(3) After confirming that the instrument and other equipment are normal, turn on the single-phase AC 220V power switch; at this time, the green light is on, indicating that the power is connected. The DC leakage and DC withstand voltage tests on the test object can begin.

　　(4) Press the red button; then the red light is on, indicating that the high voltage is connected, waiting to increase the voltage.

　　(5) Slowly adjust the voltage regulator potentiometer clockwise; the output terminal starts to increase voltage from zero. The voltage rise speed should be 3-5kV per second. For large capacitance test objects, the voltage should be increased slowly; otherwise, voltage overshoot may occur. Also, monitor that the charging current on the ammeter does not exceed the maximum charging current of the DC generator. When the required voltage or current is reached, record the readings of the ammeter and voltmeter for the specified time.

　　(6) After the test is completed, reduce the voltage, return the voltage regulator potentiometer to zero, then press the green button to cut off the high voltage and turn off the power switch.

　　(7) After the test, use the discharge rod to discharge the test object multiple times. Only after discharging can you approach the test object and perform wiring work (for details on discharging, please refer to the discharge rod manual). For small capacitance test objects such as zinc oxide arresters and magnetic blow arresters, slowly adjust the voltage regulator potentiometer to increase the voltage to the required voltage (current) value, then read the voltage (current) value from the digital display. If you need to measure 75% VDC-1mA of a zinc oxide arrester, first increase the current to 1000uA and stop at that voltage value (at this time, you can record the voltage and current values), then press the yellow button; the voltage will drop to 75% of the original and maintain this state. At this time, you can read the microammeter value and voltage value. After the measurement is completed, turn the voltage regulator potentiometer counterclockwise back to zero, press the green button, and if you need to increase the voltage again, press the red button. For large capacitance test objects, the voltage increase should be even slower, and it is necessary to monitor that the charging current on the ammeter does not exceed the maximum charging current of the generator. Be sure to slow down the voltage rise speed to avoid excessive charging current. After the test, turn the voltage regulator potentiometer counterclockwise back to zero, then press the green button to cut off the high voltage. At this time, do not turn off the power yet; the voltmeter still shows a voltage value, which is the stored voltage. Wait until the voltage drops to about 2000V, then use the discharge rod to discharge multiple times to ensure safety.

　　4. If during use the red light goes out and the green light is on, and the DC high voltage drops, it indicates that the relevant protection has been activated. At this time, follow the steps below:

　　(1) Return the voltage regulator potentiometer to zero.

　　(2) Turn off the power switch; all panel indicator lights are off.

　　(3) After one minute, wait until the low-voltage capacitor inside the machine is fully discharged, then it is allowed to turn on the power switch again. Perform a no-load test again, and after investigating the situation, you can increase the voltage again for testing.

　　5. Note: When conducting cable tests, a current-limiting resistor must be installed. (For other tests, do not use the current-limiting resistor.)

　　● The indicator lights, switches, knobs, etc. on the control box are clearly marked. When reading this operation manual, please refer to the component names on the control box panel.

　　● On the side of the voltage doubling cylinder chassis, there is a (four) five-pin socket for connecting the control box cable. On the side of the chassis, there is a copper terminal for grounding wire connection.

　　● The included high-voltage shielded ammeter is a digital microammeter. The jack on the top of the meter is for connecting the test object wire, and it also serves as the power switch. When not in use, unplug the plug to automatically turn off the power. When replacing the battery, unscrew the back cover, and after replacement, tighten the back cover.