The principle frequency used in the variable frequency series resonance test device is to use the principle of series resonance, excite the series resonance circuit with an excitation transformer (pressure variable), adjust the output frequency of the variable frequency controller, and make the circuit inductance L and the test sample C resonate in series. The resonant voltage is the voltage applied to the test sample. The frequency conversion resonance test device is widely used in industries such as power, metallurgy (content: extracting metals or metal compounds from ores), petroleum, chemical, etc. It is suitable for the handover and preventive testing of high-capacity, high-voltage capacitive test samples.

The working frequency of the frequency conversion series resonance test device

The frequency conversion series resonance test device mainly consists of a frequency converter controller, excitation transformer (air pressure variable), high-voltage reactor, high-voltage voltage divider, etc. Variable frequency controllers are divided into two categories: desktop controllers with 20KW and above, and portable box controllers with 20KW and below; It consists of a controller and a filter. The main function (control) of frequency control is to have a fixed amplitude and frequency (frequency) of 380V or 200V sine AC, and a sine wave with adjustable amplitude and frequency. And provide a power source for the development of the entire equipment. The excitation transformer (transformer) is used to increase the voltage output from the inverter power supply to a suitable test voltage. The high-voltage reactor L is an important component of the resonant circuit. The frequency conversion technology connected in series with a resonant structure test and detection device can be applied to withstand voltage tests of 10KV, 35KV, 110KV, 220KV, and 500KV polyhexene power system cables. Used for AC withstand voltage testing of 60KV, 220KV, and 500KV GIS. For large transformers, the motor frequency withstand voltage test group; Induced voltage testing of power transformers; Measurement of grounding resistance.