Why does a DC high-voltage generator require a zero-position start-up? Where should the voltage knob be placed during operation? If the start-up is not done after returning to the zero position, will it affect the equipment or the safety of the test? These are common problems encountered when using a DC high-voltage generator. The term “zero-position start-up” mainly refers to the situation where the voltage adjustment knob or the voltage control device of the equipment is at zero before the voltage is started to rise, and after confirming that the output voltage is zero, the power supply is connected and the voltage is gradually increased. This operation seems simple, but it is an important part of DC high-voltage tests.
Before starting the DC high-voltage generator, it is necessary to first check whether the test wiring is completed. The high-voltage output terminal of the equipment should be connected to the test item according to the test requirements, the grounding terminal should be connected reliably, and the test area should be isolated and warned. After confirming that the wiring is correct, check whether the power supply line, grounding line, high-voltage line, and all connection terminals are firmly connected. Only when the entire test circuit is confirmed to be normal can the equipment be started.
The core of zero-position start-up is to adjust the voltage control device to zero before the power is connected. The control methods of different models of DC high-voltage generators may vary; some use knob adjustment, some use buttons or touch screens, but the basic principle is the same, that is, the output voltage should be kept at a relatively low position when starting. This can avoid sudden high output voltage after the power is connected, reducing unnecessary risks to the test item and the test personnel.
During actual operation, you can first turn the voltage adjustment knob of the DC high-voltage generator counterclockwise to zero, or confirm that the voltage setting value has been zeroed according to the equipment interface prompts. Then connect the power supply of the equipment, observe whether the display screen, self-check status, and various indicators are normal. Only when the entire test circuit is confirmed to be normal can the equipment start.
It is particularly important to note that zero-position start-up does not mean starting the voltage immediately after the power is connected. Power-on only puts the equipment into a working state; the actual application of test voltage requires the operator to gradually adjust the voltage according to the test requirements. For test items that require DC withstand voltage tests, the voltage should be increased slowly and continuously, and it is not advisable to adjust to a high voltage quickly.
During the voltage rise process, observe the changes in the output voltage and leakage current. Normally, as the test voltage gradually increases, the leakage current will change accordingly, but the overall trend should be consistent with the characteristics of the test item. If obvious abnormal current appears at a lower voltage or the current suddenly increases rapidly during the voltage rise process, stop the voltage rise immediately and check the test item, wiring, and insulation conditions.
Zero-position start-up also has another important role, which is to facilitate the confirmation of whether the equipment control system can work normally. If the voltage is already at a higher set value before starting, the equipment may directly enter a higher output state after power-on, which is not conducive to the operator’s test preparation. Adjusting the voltage to zero allows the equipment to start from a low output state, making it easier to observe the initial operation of the equipment.
During the operation of the DC high-voltage generator, both voltage rise and voltage drop also need to pay attention to the sequence. After the test, gradually reduce the output voltage to zero, then turn off the high-voltage output and the power supply of the equipment. It is not allowed to unplug the power supply or remove the test line while the equipment is still in a high-voltage output state, and it is even more unacceptable to adjust the test wiring while the equipment is energized to save time.
For test items with certain capacitance, such as cables, transformers, and lightning arresters, even if the equipment output has been reduced to zero after the test, the test item itself may still have residual charges. Therefore, after stopping the voltage rise, it is necessary to discharge the test item according to the equipment manual and on-site safety regulations. Confirm that the test item has been safely grounded and the residual voltage has been released before removing the test line.
Some DC high-voltage generators have overvoltage, overcurrent, and zero-position protection functions. When the equipment detects that the startup conditions are not met, it may not be able to enter the normal voltage boosting state. In such cases, do not repeatedly operate the power-on and voltage boosting buttons. Instead, first check whether the voltage regulation has returned to zero, whether the grounding is reliable, and whether the emergency stop or protection functions are in a normal state. Then, follow the equipment instructions to handle the situation.
The LDZGF DC high-voltage generator produced by Wuhan Guodian Xigao Electric Co., Ltd. can be used for DC withstand voltage tests and leakage current tests. When using the LDZGF DC high-voltage generator, before starting, it is necessary to first confirm that the voltage boosting control is at zero position and check whether the connections between the high-voltage end, the grounding end, and the tested object meet the test requirements. After the equipment is powered on, gradually increase the voltage according to the test procedures.
For high-voltage test equipment like the DC high-voltage generator, in actual operation, one should not only focus on “whether the voltage can be raised”, but also pay attention to the entire process of startup, voltage boosting, pressure holding, voltage reduction, and discharge. Zero-position startup is the first step in the entire operation process and is also an important foundation for safe voltage boosting in the future.
If after the equipment is powered on, it is found that the voltage display is abnormal, cannot return to zero, or there is still abnormal output in the zero-position state, stop the subsequent operations and first check the control system, panel operation status, and the connection between the high-voltage end, the grounding end, and the tested object. For faults that cannot be determined by oneself, it is not recommended to continue the high-voltage test. Contacting technicians according to the equipment instructions for inspection is advisable.
From an operational perspective, the zero-position startup of the DC high-voltage generator can be summarized as a basic sequence: before the test, check the wiring and grounding, confirm that the voltage regulation is at zero position, connect the equipment power supply, confirm that the instrument is in a normal state, and then gradually increase the voltage according to the regulations; after the test, gradually reduce the voltage to zero position, stop the output, fully discharge, and confirm safety before removing the wiring.
Mastering the zero-position startup method of the DC high-voltage generator can reduce the risk of incorrect operation and also help ensure a more stable test process. For the LDZGF DC high-voltage generator produced by Wuhan Guodian Xigao Electric Co., Ltd., the specific operation should be based on the corresponding model’s product manual, equipment panel markings, and on-site test procedures. Different models may have differences in control methods and protection functions, and actual use should follow the product requirements.
Post time: Sep-29-2026