Variable frequency series resonanceis the use of the principle of series resonance to adjust the output frequency of the variable frequency controller, so that the circuit inductance L and the test sample C resonate in series. The high-voltage reactor L is an important component of the resonant circuit. When the power frequency is equal to 1/(2 π√ LCX), it resonates in series with the test sample CX, and the series resonance voltage is the voltage applied to the test sample.

Thevariable frequency series resonant withstand voltage devicemainly consists of a variable frequency controller, excitation transformer, high-voltage reactor, high-voltage voltage divider, etc.

Variable frequency series resonanceis suitable for various large power transformers, power cables, steam turbines, hydro generators, and other capacitive equipment. The AC withstand voltage test must be strictly conducted regularly according to the test regulations. Under power frequency conditions, due to the large capacitance of the test object or high requirements for the test voltage, there are also high requirements for the power capacity of the test device. Traditional power frequency withstand voltage devices often have large individual volumes, heavy weights, are not easy to transport on site, and are not easy to combine arbitrarily, resulting in poor flexibility.

Complete set of equipment for frequency conversion series resonance test

1. Scope of application

1.1 AC withstand voltage test for GIS, switches and other substation equipment with voltage levels of 110kV and below, with a test frequency of 30-300Hz, a test voltage not exceeding 265kV, and a test time of 1 minute.

1.2 AC withstand voltage test for 110kV/63000kVA main transformer, with capacitance ≤ 0.02uF, test frequency 45-65Hz, test voltage not exceeding 160kV, and test time of 1 minute.

1.3 AC withstand voltage test for 0.2km of 110kV/300mm2 cable, capacitance ≤ 0.0294uF, test frequency 30-300Hz, test voltage 128kV, test time 60min.

1.4 AC withstand voltage test for 10kV/300mm2 cable 3km, capacitance ≤ 1.126uF, test frequency 30-300Hz, test voltage 22kV, test time 5min.

1.5. AC withstand voltage test for 1km of 35kV/300mm2 cable, capacitance ≤ 0.1945uF, test frequency 30-300Hz, test voltage 52kV, test time 60min.

Wuhan UHV specializes in the production ofseries resonance (also known as variable frequency series resonance 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.