Step 1: Confirm the rated output voltage

The rated voltage should cover the test voltage of the tested object and leave a safety margin. Common reference:

10kV system equipment: usually choose 60kV or 80kV models

35kV system equipment: Usually choose 100kV or 120kV models

110kV and above system equipment: Select 200kV and above models according to specific test procedures

The HZZGF series covers from 60kV to 300kV, basically covering all the requirements of routine preventive testing in power systems.

Step 2: Confirm the output current

This is the most easily overlooked parameter. There are significant differences in current requirements among different test samples:

Zinc oxide lightning arrester test: The current is usually only a few hundred microamperes to 1mA level, and the 2mA model is completely sufficient;

Voltage withstand test of power cables: The cable is a capacitive load, and the charging current is proportional to the cable length, capacitance, and test voltage. A 10kV, 4km cable may have a charging current of several milliamps under DC test voltage, requiring an output current of 5mA or even 10mA to stabilize the boost.

Choosing a model with too low current and repeatedly triggering overcurrent protection during the boosting process makes it impossible to continue the experiment.

Step 3: Ripple factor and stability

The ripple coefficient of DC high voltage directly affects the accuracy of leakage current measurement. The ripple coefficient of high-quality models should be less than 0.5%, and the voltage stability should also not exceed 0.5%. HZZGF adopts high-frequency PWM closed-loop regulation technology, and both indicators meet this requirement, with reliable measurement data.

Step 4: Anti vibration microampere meter configuration

The leakage current measurement on the high voltage side must use an anti vibration microampere meter, and ordinary ammeters cannot be used for high voltage measurement. HZZGF comes standard with a shock resistant microampere meter, with a dual range design (200 µ A and 2000 µ A) and a resolution of 0.1 µ A, meeting the precise reading requirements for weak leakage currents.

Step 5: Portability

On site testing requires equipment to be able to enter the substation, upper switch room, control box, and high-voltage unit design, and be transported separately. Models with a total weight controlled within 15kg can basically meet most on-site requirements.