By sion932 
In the field of power equipment testing, “series resonance withstand voltage” is a core concept that directly relates to the insulation performance and operational safety of the equipment. You may be unfamiliar with this term, but it is the “behind the scenes hero” who ensures the stable operation of the power system. Today, let’s unveil its mysterious veil together, see what it is, why it is so important, and how we can better grasp it.
What is series resonant withstand voltage?
Simply put, series resonance withstand voltage, also known as AC withstand voltage test, is a type of withstand voltage test that uses the principle of series resonance to generate high voltage to test the insulation of power equipment (such as cables, transformers, GIS, etc.). Its core lies in ‘resonance’. Imagine when you gently pluck a string, it will vibrate and produce sound at a specific frequency. In power circuits, when inductance (L) and capacitance (C) are combined in a specific way, a similar “resonance” phenomenon can also occur, which is series resonance. In resonance state, the voltage and current in the circuit can be amplified to a level far exceeding the power supply voltage, and we use this to apply a voltage sufficient to expose potential defects to the insulation of the equipment.
What is series resonant withstand voltage?
Simply put, series resonance withstand voltage, also known as AC withstand voltage test, is a type of withstand voltage test that uses the principle of series resonance to generate high voltage to test the insulation of power equipment (such as cables, transformers, GIS, etc.). Its core lies in ‘resonance’. Imagine when you gently pluck a string, it will vibrate and produce sound at a specific frequency. In power circuits, when inductance (L) and capacitance (C) are combined in a specific way, a similar “resonance” phenomenon can also occur, which is series resonance. In resonance state, the voltage and current in the circuit can be amplified to a level far exceeding the power supply voltage, and we use this to apply a voltage sufficient to expose potential defects to the insulation of the equipment.
Why is series resonance withstand voltage so important?
The insulation material of power equipment is the cornerstone of its safe operation. Once there is a problem with insulation, it can lead to a decrease in equipment performance, it can cause short circuits, fires, and even large-scale power outages. The series resonant withstand voltage test can effectively detect early defects in equipment insulation, such as:
Insulation aging: Over time, insulation materials will gradually age and deteriorate.
Manufacturing defects: possible inclusions, bubbles, or incomplete structures during the production process.
Moisture or pollution: Moisture or pollution can reduce the dielectric strength of insulation.
Damage: Physical damage that equipment may suffer during installation, transportation, or operation.
By applying high voltage under safe and controllable conditions, we can simulate the most severe operating conditions of the equipment, thereby detecting and eliminating potential insulation hazards in advance and preventing them from developing into serious faults. This has immeasurable value in ensuring the reliability of the power grid and reducing economic losses.
Factors affecting the series resonance withstand voltage test
To obtain accurate and reliable experimental results, we need to pay attention to some key influencing factors:
Resonant frequency: Different devices require different resonant frequencies to achieve optimal voltage amplification.
Test voltage and time: It must be set according to the insulation characteristics of the equipment and relevant standards. Too high or too low will affect the effectiveness of the test.
Environmental factors such as temperature, humidity, and altitude can all affect the performance of insulation materials and need to be considered during testing.
The inductance and capacitance of the device itself are key parameters that determine whether effective resonance can be formed.
What tools can be utilized?
The development of modern power detection technology has provided us with advanced series resonance withstand voltage testing devices. These devices are usually highly integrated, easy to operate, capable of automatically adjusting frequency and voltage, and monitoring test data in real-time. Especially the series of products from HVHIPOT enjoy a high reputation in the industry. Their high-quality equipment can stably generate the required high voltage and provide accurate measurement and recording functions.
How can we do better?
To do better in series resonance withstand voltage, you can start from the following aspects:
Deep understanding of theory: Master the basic principles of series resonance, concepts such as inductance, capacitance, impedance, etc.
Familiar with standard specifications: Strictly follow the relevant national and industry pressure test standards to ensure the standardization and comparability of the tests.
Proficient in operating equipment: able to correctly select test parameters based on the condition of the tested equipment, proficient in operating series resonant voltage withstand equipment. The equipment provided by HVHIPOT has a user-friendly interface and comprehensive technical support, which can help users easily master it.
Pay attention to data analysis: not only should we focus on whether the voltage is broken down, but also analyze the details such as current changes and dielectric losses during the test process, providing more comprehensive information for judging the insulation state.
Regular maintenance and calibration: Ensuring the accuracy and reliability of testing equipment is a prerequisite for obtaining accurate test results.
Series resonant withstand voltage is an indispensable part of insulation testing for power equipment. Through continuous learning and practice, combined with advanced experimental techniques, we can better ensure the safe and stable operation of the power system.