In the power system, the insulation performance of equipment is directly related to the stable operation of the entire system. As an important insulation performance testing method for electrical equipment, series resonance withstand voltage test can effectively evaluate the reliability of equipment under high voltage environment. What is series resonance withstand voltage test and what can it bring us?

What is series resonance withstand voltage test?

Simply put, the series resonance withstand voltage test device is a device that uses the principle of series resonance to conduct withstand voltage tests on the insulation of large electrical equipment such as generators, transformers, cables, etc. It adjusts the parameters of inductance and capacitance to make the entire circuit reach a resonant state, thereby generating a huge resonant voltage at a small input power to simulate the high voltage stress that equipment may encounter in actual operation. This testing method is highly favored for its efficiency and economy, and is an indispensable means of high-voltage electrical equipment withstand voltage testing.

What are the factors that affect the effectiveness of the experiment?

Stability and purity of power supply: Unstable power supply may introduce additional interference, affecting the accuracy of test results.

The capacitance value of the test sample (tested equipment): The capacitance value of the test sample is an important parameter that determines the resonant frequency and needs to be accurately matched.

The quality and parameters of inductors: The inductance and losses of inductors directly affect the resonance effect and the reliability of the test.

Humidity and temperature in the experimental environment: These environmental factors may affect the dielectric properties of insulation materials.

What tools and technologies can we utilize?

Modern series resonant voltage withstand test devices typically integrate advanced control systems and measurement modules. For example, Wuhan Ultra High Voltage Power Technology Co., Ltd. has rich experience and technical accumulation in this field, and its products can provide precise frequency regulation, voltage control, and real-time insulation monitoring. These devices often have the characteristics of high intelligence, convenient operation, and strong safety, which can greatly improve the efficiency and accuracy of insulation testing for power equipment.

What fields are closely related to the series resonance test?

The application scope of series resonance test is very wide, mainly involving:

Power transmission and transformation: Conduct insulation and voltage withstand tests on cables, transformers, GIS, etc.

In the field of power generation: insulation performance evaluation of generators, transformers, etc.

Industrial Electrical: Insulation testing of various large high-voltage motors.

In electrical insulation strength testing, it is a very efficient and practical method.

How can we do better?

To obtain more reliable experimental results, it is recommended to:

Strictly follow the testing procedures: ensure that the operators are familiar with the equipment performance and testing steps.

Regularly verify testing equipment: ensure the accuracy of testing equipment.

Combined with other detection methods such as dielectric loss testing, partial discharge measurement, etc., conduct a comprehensive evaluation.

The professional technical team of Wuhan UHV Power Technology Co., Ltd. can also provide relevant technical support and consulting services to help you better complete preventive testing of power equipment.

Frequently Asked Questions (FAQ)

Q: Is the input power requirement for a series resonance voltage withstand test device high? A: Relatively speaking, the input power requirement for a series resonance test device is not high. Due to the utilization of resonance effect, the requirements for the power supply to generate high voltage are not stringent.

Q: What electrical equipment is suitable for series resonance voltage withstand test? A: It is mainly applicable to large-scale, high-capacity electrical equipment, such as high-voltage cables, generators, transformers, GIS composite electrical apparatus, etc.

Q: What is the difference between a series resonance test and a DC voltage withstand test? A: The DC voltage withstand test primarily assesses the DC breakdown characteristics of insulation, whereas the series resonance test is closer to the actual AC operating conditions of the equipment, enabling more effective detection of weak spots and defects in insulation.

Q: What should I do if resonance instability occurs during the test? A: Possible reasons may include changes in the test sample's capacitance, inaccurate frequency adjustment, or external interference. It is recommended to check the equipment parameter settings, power supply stability, and try to fine-tune the frequency.

Q: What parameters should I pay attention to when purchasing a series resonance voltage withstand test device? A: You need to pay attention to the voltage level, capacity (or test current), frequency adjustment range, as well as the intelligence level and safety design of the control system of the device. Wuhan UHV Power Technology Co., Ltd. can provide you with professional selection advice.