DARUI Electric recommends
Yangzhou DARUI Co., Ltd.'s three-frequency induction withstand voltage generator is used for power transformers, voltage transformers, and other test objects. In addition to performing external power frequency high voltage tests on the main insulation of fully insulated transformers, it is also necessary to conduct induced high voltage tests on the longitudinal insulation of transformers and the main insulation of semi-insulated transformers. According to national test standards, the induced test voltage for power transformers and voltage transformers is approximately 2-3 times the maximum working phase voltage. As is well known, when a transformer operates at rated frequency and rated voltage, the iron core is close to saturation. If a test voltage greater than the rated voltage is applied across the windings of the transformer under test using power frequency, the no-load excitation current will increase sharply to an unacceptable level. From the relationship of induced electromotive force, it can be seen that to apply a test voltage greater than the rated voltage without saturating the iron core, the method of increasing the power supply frequency can be adopted, and a frequency multiplier power source generator must be used.
Product Parameters:
◆ Input Voltage: Three-phase 380V 50Hz
◆ Output Voltage: Single-phase 0~300V/0~500V/0~1000V (continuously adjustable), Frequency: 150Hz
◆ Output Capacity: 0~1000kVA, Harmonic Distortion: <1%
◆ No-load Operation Time: ≤5 minutes
◆ Duration of Test Object at Rated Voltage: 40 seconds
◆ Load Characteristics: Suitable for resistive, inductive, and capacitive loads
Usage Method:
1. Connect the circuit according to the working principle diagram. The transformer casing and operation console must be properly grounded.
2. Connect the power supply, the green indicator light on the operation console will light up, then press the start button, the red indicator light will light up, indicating that the current generator is waiting to increase current.
3. Rotate the voltage regulator evenly clockwise to make the output current indication reach the required large current. To ensure test accuracy, a standard ammeter can be connected in series at the meter terminals.
4. During the test, if any abnormal situation occurs, immediately cut off the power supply, find out the cause, and then conduct the test again.
5. After the test, the voltage regulator must be adjusted back to zero, press the stop button to cut off the power supply; only after cutting off the working power can the test wiring be removed to ensure safety.
Note: The above information and technical parameters are compiled and released by Yangzhou DARUI Electric Co., Ltd.
