By hvhipot 
In the safe operation of power equipment, series resonance withstand voltage is a key link to ensure the insulation performance of the equipment and prevent damage due to overvoltage. But doesn’t this concept sound a bit professional? Don’t worry, we just broke it apart and crushed it to make it clear and easy to understand.
What is series resonant withstand voltage?
Simply put, series resonance refers to the phenomenon in an AC circuit where a large current and voltage are generated when the inductance and capacitance of the inductor and capacitor components are equal. This phenomenon is called resonance. Series resonance withstand voltage refers to applying a test voltage higher than the rated working voltage to the insulation of power equipment (such as cables, transformers, etc.) using the principle of series resonance under specific testing conditions, in order to test its ability to withstand overvoltage. This is like doing a “pressure test” on the equipment to ensure that it is still stable when encountering short-term high-pressure shocks.
Key factors affecting the series resonance withstand voltage
To achieve effective series resonance withstand voltage testing, several factors cannot be ignored:
Inductance (L) and capacitance (C): These are the basis for resonance to occur. The capacitance value of the tested device will vary with its type, length, structure, etc. And the inductance devices we use for resonance, such as reactors, need to be able to match the capacitance of the tested equipment to achieve the resonance frequency.
Stability of test voltage: Voltage fluctuations during the test directly affect the accuracy of the test results.
Test frequency: Resonance occurs at a specific frequency, and reaching the resonance point by adjusting the frequency of the test power supply is the core operation.
Equipment insulation status: The insulation quality of the tested equipment itself directly determines how high voltage it can withstand.
A powerful tool for mastering series resonance withstand voltage
In order to accurately control and perform the series resonance withstand voltage test, we usually rely on professional instruments and equipment. The advanced series resonance withstand voltage test device provided by HV Hipot Electric Co., Ltd. can accurately adjust frequency and voltage, stably output high voltage, effectively monitor the test process, and ensure the accuracy and safety of the test. These devices typically integrate power supplies, reactors, capacitive dividers, and protective devices to form a complete resonant system.
The series resonance withstand voltage and its related matters
Insulation diagnosis: Series resonant withstand voltage is an important means of diagnosing insulation aging and defects in power equipment. By observing the response of the equipment when subjected to high voltage, its insulation performance can be evaluated.
Equipment factory and preventive testing: Newly produced power equipment needs to undergo voltage withstand testing before leaving the factory, and regular preventive testing is also required during operation to discover potential insulation hazards.
Cable voltage withstand test: Cable is one of the most commonly used scenarios in series resonant voltage withstand test, especially for some long-distance, high-voltage cables.
Transformer winding withstand voltage: The winding of the transformer also needs to undergo insulation withstand voltage test.
How can we do better? ――Practical experience in improving series resonance withstand voltage
To make the series resonance withstand voltage test more efficient and accurate, we can start from the following aspects:
Accurate selection of reactors: Based on the capacitance value of the tested equipment, select reactors with appropriate inductance values to ensure that the resonant frequency is within the adjustment range of the test power supply. The equipment of HV Hipot Electric Co., Ltd. provides a good solution in this regard.
Optimization test steps: Follow the standardized test process, slowly increase the voltage, carefully observe the equipment status, and maintain sufficient time after reaching the specified voltage.
Strengthen data analysis: not only record the test voltage, but also pay attention to the changes in current and partial discharge during the test process, which can provide richer information.
Pay attention to the preparation before the experiment: ensure that the experimental environment is dry and clean, and that the equipment connections are firm and reliable.
HV Hipot Electric Co., Ltd. is committed to providing reliable testing solutions for the power industry. Its products have performed well in the field of series resonance withstand voltage testing, helping users to more accurately evaluate equipment insulation.