Wuhan UHV specializes in producing series resonance (also known as series resonance test device). Next, we will share with you the characteristics of the series resonance test device.
The principle of series resonance is widely used in power preventive testing projects, targeting insulation inspection of large capacity and high-voltage power equipment. Different combinations of adjustable reactors are used to adjust the size of the reactance and generate resonance conditions with the test object. The series resonance test device is mainly composed of a variable frequency power supply, excitation transformer, reactor, compensation capacitor, and capacitive voltage divider. Compared with oil immersed test transformers, its function is broader, but its disadvantage is that it loses the advantages of portability in terms of volume and weight. However, this also conforms to the process structure and electrical theory. Series resonance is suitable for application scenarios.
It is explicitly stated in the power preventive testing project that it is no longer recommended to use DC high-voltage generators for voltage withstand testing of equipment such as cables. Instead, it is recommended to use a series resonance testing device with a frequency of 20~300Hz for insulation testing. Therefore, high-capacity, high-voltage power preventive testing equipment such as transformers, GIS fully enclosed composite appliances, and power cables are widely used.
Characteristics of series resonant circuit
From a physical perspective, resonance is vibration. The principle of applying the force and reaction force generated at the same equilibrium position through a common frequency to the power system is basically consistent. Series resonance refers to the formation of a measurement circuit through a series connection and the generation of resonance conditions. The voltage generated by adjusting the output low-voltage voltage through excitation and reactance is commonly known as the "resonance voltage".