How To Use The DC Withstand Voltage Tester

The DC withstand voltage tester is an instrument that provides a high-voltage DC source. Before using the instrument, the instrument must be reliably grounded. The staff who use the DC withstand voltage tester must be professionals with a "high-voltage test certificate". When using the DC withstand voltage tester, users must follow Article 168 of the "Electric Power Safety Regulations" and install two obvious disconnect points before the working power enters the tester. When replacing the test product and wiring, the two power disconnect points should be clearly disconnected first. At the same time, at least three staff members must be on site to effectively ensure the safety of the users. Before turning on the power on the instrument, make sure that the DC withstand voltage tester is connected to a 220V AC power supply, carefully check whether the wiring is correct, and also check whether the wiring of the high-voltage discharge rod is reliable. In the process of increasing and decreasing the voltage of the DC withstand voltage tester, keep the rise and fall slowly. Steady voltage increase is one of the most important points to extend the service life of the DC withstand voltage tester. Also try to avoid using the instrument over the range. After each test, return the potentiometer to zero, then cut off the power supply to discharge the test product. The discharge process is divided into two steps. For the discharge of large-capacitance test products, a special discharge resistor rod should be used to discharge the test product. During discharge, the discharge rod cannot be brought into contact with the test object immediately. The discharge rod should be gradually brought close to the test object. When the air gap reaches a certain distance, the free discharge begins, with a hissing sound. When there is no sound, the discharge rod can be used for discharge, and finally the ground wire can be directly connected for discharge. When the DC high voltage is 200kV or above, although the test personnel wear insulating shoes and are outside the safe distance, due to the influence of the electric field distribution of the high-voltage DC ion space, several nearby standing human bodies will have different DC potentials. The test personnel should not shake hands with each other or touch the grounding body with their hands, etc., otherwise there will be a slight electric shock phenomenon. This phenomenon is more obvious in dry areas and winter, but due to the small energy, it generally does not cause harm to the human body. The power supply of the DC withstand voltage tester control box is AC 220V±10%, 50Hz. If the power supply is through a 1/1 isolation transformer or a self-generated power supply is used on site, the power supply must be manually connected to the ground at one point.