By sion932 
In the safe operation guarantee of power equipment, “withstand voltage testing” is definitely an indispensable part. Today, let’s talk about a well-known “hero” in the field of voltage testing – the series resonant voltage tester. You may have heard of it or come into contact with it in your work, but what exactly is it? How does it work again?
What is series resonance withstand voltage test?
Simply put, series resonant withstand voltage testing is a method of using the principle of series resonant circuits to test the withstand voltage performance of high-voltage electrical equipment. As we all know, the insulation performance of high-voltage equipment may gradually decrease during long-term operation. At this time, it is necessary to “check” to see if it can still withstand high voltage. And the series resonance tester is the capable assistant of this “physical examination doctor”.
Why choose series resonance?
Traditional high-voltage withstand voltage testing requires equipment that can provide high current. Imagine, if you were to test a large transformer, how much power would be required? That’s not a joke! The beauty of the series resonance tester lies in its ability to generate resonance between the inductor and capacitor by adjusting the resonance frequency, thereby obtaining a high test voltage with very low input power. This is like “pulling a thousand pounds with four ounces”, greatly reducing the requirements for power supply, and also safer and more convenient.
Factors affecting the effectiveness of series resonance withstand voltage testing
To achieve more accurate and reliable test results, it is important to pay attention to a few small details:
The capacitance and inductance of the test sample: This is the basis of the resonant circuit and directly affects the selection of the resonant frequency.
Stability of test voltage and frequency: If the voltage and frequency fluctuate too much, the test results will naturally be inaccurate.
Environmental temperature and humidity: These can affect the performance of insulation materials, thereby affecting test results.
Grounding condition: Good grounding is a prerequisite for ensuring testing safety and accuracy.
What tools can help us better perform series resonance withstand voltage testing?
Of course, in addition to the series resonant withstand voltage tester itself, there are also some auxiliary equipment that can make our work more efficient:
Capacitive voltage divider: used to measure the test voltage on the test sample.
Insulation resistance tester: used to preliminarily evaluate the insulation condition of equipment.
Operating power and grounding wires: This is the basic configuration for safe operation.