In addition to the AC power frequency withstand voltage test, the oil-immersed test transformer can be assembled into a DC high-voltage test device if it is equipped with capacitors, silicon stacks and high-voltage DC microammeters of the same voltage level and the same capacity, which can measure high-voltage DC leakage. Current. The shell of the oil-immersed test transformer and the shell of the operating system must be reliably grounded. The X-end of the high-voltage winding of the test transformer and the F-end of the measuring winding must be grounded reliably.

Use of a single oil-immersed test transformer

1. Before the test, the "mountain" end of the high-voltage tail of the oil-immersed test transformer should be reliably grounded, otherwise the safety of people and equipment will be endangered.

2. Before operation, you must be familiar with the electrical principles and usage methods of the oil-immersed test transformer and power control box.

3. Connect according to the wiring diagram shown in the manual of the oil-immersed test transformer.

4. The preparation work and safety measures are in place, and the oil-immersed test transformer has a dry test of the equipment.

5. After the empty test has no abnormal conditions, connect the tested product.

6. Turn on the power, and the power indicator of the control box (station) will be on.

7. Press the closing button, the closing indicator light is on.

8. Evenly pressurize clockwise, and watch the stage voltage amplitude reached by the voltmeter and the condition of the tested product until the rated test voltage.

9. Continue to specify the withstand voltage time and watch the ammeter and the tested product.

10. When the withstand voltage time is up, watch the kV meter and quickly reset the voltage regulator to zero.

11. Use a discharge rod to discharge through the resistance, and then directly ground the discharge.

12. The high-voltage parts may be discharged one by one by the charging parts, change or remove the high-voltage line leads, so far the (phase) test is terminated.