Correct Use of Discharge Rod and Current Limiting Resistor for DC High Voltage Generator




1. Reference for the use of matching current limiting resistors in DC high voltage generators

Theoretically, a current limiting resistor R should be set in both AC and DC high voltage test circuits (see Figure 9). Its purpose is to limit the current when the test object Cx discharges or breaks down, so as not to damage the test equipment during high voltage short circuits. However, in practice, for various reasons, the current limiting resistor is not used. For this reason, when designing our products, our company has considered that if the high voltage lead falls to the ground, it will not damage the tester even when the current limiting resistor is not used. In addition, we have designed a current limiting resistor that is extremely easy to install. Therefore, the following suggestions are made for the use of the current limiting resistor:

1. When performing DC high voltage tests on power equipment such as zinc oxide arresters, ordinary valve-type arresters, high voltage switches, and power transformers, the current limiting resistor may not be used for our company's products.

2. When testing power cables, a current limiting resistor should be connected in series in the high voltage circuit (simply screw the matching current limiting resistor onto the high voltage output bolt at the top of the voltage doubling cylinder).

2. Use of the discharge rod for DC high voltage generators

    1. The special discharge rod must not directly contact the high voltage DC discharge; a certain distance should be maintained. When the tip of the discharge rod initially produces corona discharge and the voltage on the test object gradually drops to 20% of the test voltage, then the discharge rod can be touched to the microammeter housing for discharge. Finally, directly hang the ground wire at the grounding end of the discharge rod on the test object.

    2. Special attention: Do not directly discharge the ground wire on the high voltage microammeter housing, to avoid damage to the high voltage microammeter caused by strong impulse discharge current.

    3. See Figure 4 for the wiring diagram   Schematic diagram of the grounding wire of the test circuit