1、 Principle of series resonant voltage withstand test device
The series resonant voltage withstand test device is a testing method that utilizes a series resonant circuit to achieve high voltage output. The basic principle is to use a transformer to raise the low voltage to the high voltage value that needs to be tested, and output the high-frequency signal to the tested equipment for testing through a series resonant circuit.
Introduction to frequency conversion series resonance: It consists of frequency conversion power supply, isolation transformer (also known as excitation transformer), reactor and capacitive voltage divider. The capacitor and reactor of the test object form a series resonant connection method; The voltage divider is connected in parallel to the test object, used to measure the resonant voltage on the test object and act as an overvoltage protection signal; The frequency modulation power output is coupled to the series resonance circuit through an excitation transformer, providing excitation power for series resonance.
2、 Application of Series Resonance Voltage Withstand Test Device
The series resonant voltage withstand test device is widely used for insulation performance testing of various high-voltage equipment in power systems. For example, equipment such as transformers, circuit breakers, and transformers need to undergo voltage withstand tests to ensure their safe and reliable operation.
In addition, the series resonance withstand voltage test device can also be used to study characteristics such as capacitance and dielectric loss. By changing parameters such as testing frequency and load size, the insulation performance data of the tested equipment under different conditions can be obtained, providing reference for equipment design and selection.
3、 Problems and Solutions of Series Resonance Voltage Withstand Test Equipment
1. Accuracy issue: Due to the resonance effect of a series resonant circuit on a specific frequency, the test results may be affected by factors such as test frequency and load size. In order to improve the test accuracy, appropriate test parameters can be selected according to the characteristics of the tested equipment, and the data accuracy can be improved through repeated tests.
2. Safety issue: Due to the high testing voltage, if the testing equipment and personnel are not adequately protected, it may cause harm to personnel and equipment. To ensure testing safety, it is necessary to strictly comply with relevant safety regulations and equip professional protective equipment during the testing process.
3. Equipment cost issue: The series resonance withstand voltage test device requires the use of professional testing instruments and equipment, which is costly. In order to reduce costs, testing can be conducted by renting or sharing equipment.
Conclusion:
The series resonant voltage withstand test device is a widely used method for testing the insulation performance of high-voltage equipment in power systems. Its simple principle, high reliability, and good data accuracy have made it widely used in power systems. However, there are also issues with accuracy, safety, and cost that require careful consideration and resolution in practical applications.
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