In electrical testing, parallel resonance andseries resonanceare both structural branches of the series resonance testing device, with a slight difference in their names. Below is a basic introduction to series resonance.
What is series resonance?
Due to the fact that most power preventive tests are conducted on large capacity and high voltage electrical equipment, it is recommended to use power frequency withstand voltage for insulation performance testing, which eliminates the requirement for using DC high-voltage generators for insulation performance testing of electrical equipment. Although both belong to destructive tests, after long-term research, the use of power frequency withstand voltage has better stability and safety compared to DC withstand voltage. Due to the large capacity and high voltage of electrical equipment, power frequency withstand voltage equipment such as oil immersed test transformers often cannot meet the testing requirements. In China, in order to achieve this goal, measurement is basically achieved through frequency conversion series resonance.
Variable frequency series resonance, "variable frequency" in a series resonant circuit, generates resonance conditions by adjusting a variable frequency range. "Series" refers to the connection method in the entire circuit. When connected in series, the voltage is added and the current remains unchanged. "Resonance" refers to the resonant circuit, and when combined, it is commonly referred to as a series resonant test device. What are the conditions before the image series resonance test?
Pre experimental condition analysis
After we receive the experimental project, we need to analyze what the subject of the test is, such as power cables, transformers, GIS combiners, busbars, etc. The voltage applied to different contents is different. For example, for the same transformer, the voltage level of neutral point grounding and ungrounded is different, and the wiring is also different. The voltage and capacity directly affect the configuration scheme of the series resonance test device. The configuration scheme refers to the connection method, series connection method, how to connect in series, and how many series are connected, etc.
The condition for achievingseries resonanceis that resonance can occur when the capacitive reactance is equal to the inductive reactance.
Wuhan UHV specializes in producingseries resonance (also known as power frequency withstand voltage test equipment)and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.
