Three-Frequency Induction Withstand Voltage Tester - Yangzhou Darui
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Performance Features:
1.Three-Frequency Induction Withstand Voltage Tester adopts a three-phase five-column structure, which simplifies the process and reduces the internal impedance and leakage flux loss of the transformer body, improving the efficiency of the generator.
2. The weight and volume are smaller than traditional three single-phase transformer groups, and it is equipped with a control box of corresponding capacity, making it convenient for on-site use.
3. This product can be used as a power source for induction withstand voltage tests on transformers and electrical equipment of corresponding capacity, or as a 150Hz power supply for short-term operation.
Product Operation:
1. Connect the power supply, close the air switch, and the green indicator light of the control device will turn on.
2. Return the voltage regulator to zero, press the red start button, and the three-frequency generator will start running, with the voltage regulator waiting to boost voltage.
3. Adjust the voltage regulator to the required test voltage and closely monitor the current and voltage values in the control device, and make detailed records.
4. If during the test, the test object experiences insulation breakdown between turns, layers, sections, or phases, the test current in the control circuit will increase, and the relay can immediately trip and cut off the power.
5. After the test, return the voltage regulator to the zero position.
Operating Steps
1. No-load test of this device
Connect the three-phase 380V power supply directly to the "A, B, C" input terminals on the back of the device. The test method is the same as the no-load test method for the split-type three-frequency power generator device.
2. Load test
(1) Connect the three-phase 380V power supply directly to the "A, B, C" input terminals on the back of the device; connect the two ends of the test object to the "a, x" output terminals on the back; connect the ground wire properly;
(2) Connect the power supply, return the voltage regulator handle to zero, and the power indicator light (green) will turn on; press the red button, the contactor closes, and the working indicator light (red) turns on;
(3) Rotate the voltage regulator handle clockwise evenly, closely watch the output voltage meter, and when it rises to the required voltage value, turn on the timing switch (the time relay is set to 040 according to test requirements) to start timing the withstand voltage duration;
(4) If no abnormal situation occurs, after 40 seconds, you will hear the timing sound, immediately rotate the voltage regulator handle counterclockwise to zero; press the red stop button, the contactor cuts off power, the working indicator light turns off, and the green signal light turns on. At this time, quickly cut off the input three-phase power supply, and the test is complete.
Product Applications:
1. Widely used for frequency-doubled induction withstand voltage tests on voltage transformers.
2. For phase-by-phase frequency-doubled induction withstand voltage tests on power transformers.
3. For frequency-doubled induction withstand voltage tests on other inductive coil-type electrical products.
Product Usage Method:
1. Connect the working wires according to the test wiring diagram, and ensure the three-frequency generator housing is reliably grounded.
2. Close the power supply of the three-phase voltage regulator, and turn the three-phase voltage regulator clockwise to 380V.
3. Close the three-frequency power supply control box, the control box power indicator light (green) turns on, press the start button, the working indicator light (red) turns on, and the three-frequency generator has now produced three times the frequency and voltage.
4. Rotate the single-phase voltage regulator handle clockwise to boost the voltage to the rated voltage. If it cannot reach the rated voltage, increase the voltage of the three-phase voltage regulator until it reaches the voltage required by the test object.
5. Closely monitor the instrument readings and the condition of the test object until the required test time is reached.
Note: The above translation is based on the provided Chinese content. The HTML tags and attributes remain unchanged, and only the Chinese text within the tags has been translated into English.
