50kV VLF DC Hipot Tester

HMCOP-50kV VLF Hipot Tester of Display Video

I.Startup, Shutdown and Reset

  After connecting all the lines according to the above method, the power switch can be turned on. After the microcomputer is powered on or reset, the instrument will automatically enter the interface as shown in Figure 1. When connecting wires, removing wires, or temporarily not using the instrument, turn off the power supply. The power socket is equipped with a safety tube. 

Figure 1 Schematic diagram of touch screen

II.Set parameters

Figure 2 parameter setting interface

   First, click the "setting" button on the screen of Figure 1 to display the setting parameter interface shown in Figure 2. In Figure 2, the output frequency, test time, test voltage, overcurrent protection value and overvoltage protection value on the high voltage side can be set according to the needs of the test. The modification method is as follows:

★ There are three options for frequency: 0.1, 0.05 and 0.02, and the unit is Hz.

★ Timing modification range: 0-99 points. It specifies the duration of the test, in minutes.

★ Set voltage: range from 0 to rated value, unit: kv. It sets the test voltage we want to raise. When the instrument rises to this set voltage limit, it will no longer boost voltage, and maintain constant amplitude sine wave output at this peak value.

★ Set voltage limit: the setting range of voltage protection value is from 0 to rated value, and the unit is kv. It specifies the upper limit value of the voltage passing the test object. When the voltage exceeds this setting, the instrument will automatically cut off the output.

★ Setting current limit: the setting range of current protection value is from 0 to rated value, and the unit is ma. It specifies the upper limit value of current passing through the test object. When the current exceeds this setting, the instrument will automatically cut off the output.

(Note: the above voltage, current and measurement data displayed by the instrument are all peak values.)

III.Automatic boosting

   After pressing the "start" key in Figure 1, the instrument will carry out the boosting test under the control of the computer as follows:

Self-inspection → boosting → constant amplitude output → shutdown

The specific process is as follows:

1.Self inspection process

  The controller automatically enters the load detection. If no load is detected, the prompt message "load not connected" in the status bar of Figure 3 indicates that the booster or capacitive test sample is not connected.

Figure 3 the controller indicates that the load is not connected

2.Boosting process

  After the self-test is successful, the instrument will automatically enter the boosting state, as shown in Figure 4, and the prompt message in the status bar is "boosting". At the same time, the timing began.

Figure 4 the controller indicates that the voltage is boosting

3.Equal amplitude output

  The controller will raise the voltage to the set value in several cycles, and the instrument will output the equal amplitude, as shown in Figure 5. The prompt message in the status bar is "equal amplitude output".

 Figure 5 constant amplitude output of controller prompt

4.Downtime

When the timing reaches the set time, the instrument will stop automatically, as shown in Figure 6, and the prompt message in the status bar is "stop the test".

Figure 6 controller prompts to stop the test

Power cable withstand voltage test method

 Disconnect all electrical equipment connected to the tested cable.

 Use a megger to test the insulation parameters of each phase of the cable, and carry out the ultra-low frequency withstand voltage test only after the test is qualified.

 Set the test voltage value: Umax = 3uo, where uo is the rated phase voltage of the cable. Example 1: cable parameter: the rated line voltage is 10kV, and the rated phase voltage uo = 6kV, so the test voltage setting value is:

Umax = 3uo = 18kV

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