The HDYD power frequency withstand voltage test device power supply test box operation guide is a special supporting equipment for light test transformers. This control box/table has the characteristics of convenient use and maintenance, excellent performance, safe and reliable use, beautiful appearance, sturdy and durable, and easy to move. It is essential equipment for power supply enterprises, large factories, metallurgy, power plants, railways, and other departments that require power maintenance. Before operation, the maximum working current should be calculated based on the capacity and voltage level of different test objects, and the current protector should be adjusted accordingly. The test wiring or related connection diagram in the test transformer should have the grounding terminal properly grounded (taking the withstand voltage test as an example below). Connect the power supply (box type uses socket power, table type uses terminal power), and turn the voltage regulator handle to the zero position. The zero position switch is closed, and the zero position indicator light (yellow) lights up (also known as the voltage regulator zero position output status indication); 2. Press the start button (green), the contactor engages, the voltage regulator receives power, and the working indicator light (red) lights up, accompanied by an alarm sound (the alarm sound and light can only stop after the voltage regulator leaves the zero position); 3. Slowly and evenly rotate the voltage regulator handle clockwise, closely watching the meter readings. When the required high voltage value is reached, stop rotating the handle and promptly press the timing button (yellow). At this time, the digital display time relay starts timing and displays the time (the timing unit is “s”, AC withstand voltage test steps seconds). When the set time is reached, what is a withstand voltage test the control box (table) emits audible and visual alarms. Promptly rotate the voltage regulator handle in the opposite direction until the voltage regulator returns to zero, then release the timing button. 5—4. If overcurrent such as short circuit, flashover, or breakdown occurs, the current relay protection trips, and the voltage regulator automatically cuts off power, indicating that the test object is unqualified. At this time, the voltage regulator should be returned to zero, the power should be cut off, and the test object should be inspected. 2. If not used for a long time, before use, measure the insulation resistance with a 500V megohmmeter, and the resistance should not be less than 0.5MΩ; 4. This box (table) is equipped with overcurrent protection, which is adjusted to 80% of the rated current at the factory. For small loads, it should be reset according to the rated capacity current of the test object; 4. The working place should be free of gases, vapors, chemical dust, and other explosive and corrosive media that seriously affect insulation. Return to Sohu, see more