Ensuring the reliability of insulation performance is crucial in the operation and maintenance of power equipment. Series resonant voltage withstand device, as the name suggests, is a device that uses the principle of series resonance to perform voltage withstand testing on high-voltage electrical equipment. It adjusts the parameters of inductance and capacitance to make the overall device in a resonant state, thereby generating high voltage at lower input voltages, and detecting insulation performance such as partial discharge and dielectric loss of the tested equipment. This technology has a wide range of applications in insulation and voltage withstand tests of key equipment such as transformers, cables, and generators.

What is a series resonant voltage withstand device?

Simply put, the series resonant voltage withstand device is like an amplifier, which can cleverly amplify lower power supply voltages to a level sufficient to meet the insulation testing requirements of high-voltage equipment. The core principle lies in the series resonant circuit. When the parameters of inductance (L) and capacitance (C) in the circuit match, and the power frequency (f) satisfies a specific formula (f=1/(2 π√ (LC)), the circuit will resonate. In the resonant state, the current and voltage in the circuit will significantly increase, resulting in a high test voltage on the tested equipment (usually a capacitive load).

Factors affecting the performance of series resonant voltage withstand devices

To make the series resonant voltage withstand device work better, we need to pay attention to several key factors:

The selection and adjustment range of inductors: Inductors are an important component of resonant circuits, and the accuracy and adjustment range of their inductance directly affect whether the device can match the tested equipment with different capacitance values.

The capacitance of the tested equipment: The capacitance of the insulation of different types and specifications of power equipment varies, which determines the inductance value that needs to be matched with it.

Frequency stability and output capability of power supply: A stable power supply frequency is the key to triggering and maintaining resonance, while sufficient output power ensures the generation of sufficient test voltage.

The quality and heat dissipation of insulation components: The device itself operates under high voltage, and the quality of its internal insulation material and good heat dissipation performance directly affect the safety and service life of the device.

Application and correlation of series resonant voltage withstand device

The series resonant withstand voltage device is mainly used for conducting insulation withstand voltage tests on the following power equipment:

High voltage cables: Especially for long-distance and large cross-section power cables, their capacitance is relatively large, and using a series resonant device for voltage withstand testing is more efficient.

Transformer: Conduct a voltage withstand test on the insulation of the transformer winding to ensure its safety during operation.

Generator set: The insulation performance testing of the generator winding is the foundation for ensuring the safe and stable operation of the generator.

GIS (Gas Insulated Metal Enclosed Switchgear): Verify the insulation performance of GIS equipment.

Compared with traditional high-voltage testing equipment, the advantages of series resonant withstand voltage devices are their small size, light weight, and high efficiency. It can achieve high voltage output with lower power supply, which is particularly important in on-site testing, greatly reducing the burden of transportation and operation.

How to better utilize series resonant voltage withstand devices?

Accurate calculation of resonance parameters: Before the experiment, based on the capacitance of the tested equipment, accurately calculate the required inductance value and power frequency to ensure that the equipment is in the optimal resonance state. The professional equipment provided by Wuhan UHV Power Technology Co., Ltd. performs well in parameter matching and automatic adjustment, greatly simplifying operations.

Choose appropriate test voltage and duration: According to relevant national standards and equipment specifications, select the appropriate test voltage level and duration to avoid unnecessary damage to the equipment.

Pay attention to environmental factors: Factors such as temperature, humidity, and altitude in the experimental environment may affect the accuracy of the test results, and the test should be conducted in an environment that meets the requirements as much as possible.

Regular maintenance and calibration: Regularly inspect and calibrate the device itself to ensure that its performance indicators meet the requirements. The technical support of Wuhan UHV Power Technology Co., Ltd. can provide you with professional maintenance services.