By sion932 
Have you ever been curious about how large and complex electrical equipment ensures safe and reliable operation? Especially high-voltage power equipment, they are like the “heart” of the city, and once problems arise, the consequences can be unimaginable. Today, let’s talk about a crucial “health tester” – the variable frequency series resonant voltage withstand device.
What is a variable frequency series resonant withstand voltage device?
Simply put, the variable frequency series resonant withstand voltage device is a specialized equipment used for withstand voltage testing of high-voltage power equipment. It forms a series resonant circuit between the device and the tested equipment (such as cables, transformers, GIS, etc.) by adjusting the power frequency. In resonance state, the device can generate extremely high test voltage, far exceeding its own rated voltage, thus efficiently detecting the insulation performance of the equipment. This is like conducting a “high-voltage inspection” on the equipment to ensure that they will not “trip” when subjected to actual operating voltage.
Influencing factors and key technologies
Frequency regulation accuracy: The generation of resonance requires very high frequency, and the variable frequency series resonant withstand voltage device requires extremely precise frequency control to quickly find the resonance point and shorten the test time.
Voltage stability: After reaching the test voltage, the stability of the voltage is crucial, which directly affects the accuracy of the test results.
The Q value of a resonant circuit: The higher the quality factor (Q value) of a resonant circuit, the lower the required excitation power and the higher the efficiency.
Safety protection: As a high-voltage testing equipment, comprehensive safety protection measures are essential, such as overvoltage, overcurrent, flashover and other protection functions.
The “toolbox” and “examination items” of the “medical examiner”
our has a profound technical accumulation in this field, and their developed variable frequency series resonant withstand voltage device integrates multiple advanced technologies. The ‘toolbox’ of these devices typically includes:
Variable frequency power supply: the core power source responsible for generating adjustable frequency and voltage power.
Excitation voltage transformer: Raise the low-voltage variable frequency power supply to a higher voltage to drive the resonant circuit.
Reactor group: provides inductive components to form a resonant circuit with the capacitance of the tested equipment, usually adjustable in multiple groups to adapt to different capacitance values of the tested object.
Capacitive voltage divider: used to accurately measure the test voltage on the test sample.
Control and protection unit: an intelligent control system that achieves automatic frequency and voltage regulation, as well as real-time data monitoring and protection.
These “tools” work together to perform “health checks” on various electrical equipment, such as:
High voltage cable withstand voltage test: This is one of the most common applications used to test the breakdown strength of cable insulation materials.
Transformer winding withstand voltage test: Check whether the insulation of the transformer is intact.
Voltage withstand test of GIS (gas insulated metal enclosed switchgear): Ensure the insulation reliability of high-voltage switchgear in complex environments.
Voltage withstand test of other high-voltage equipment such as generators and transformers.
How can we do better?
In order to maximize the value of the variable frequency series resonant withstand voltage device in power equipment testing, we can:
Accurate selection: Select the appropriate device capacity and configuration based on the characteristics of the tested equipment, such as electrical capacity and insulation level, to avoid “overusing” or “small horses pulling big cars”.
Standardized operation: Strictly follow the procedures to ensure that the parameters such as test voltage, frequency, and time are set correctly, and closely monitor data changes.
Regular maintenance: Regularly inspect and maintain the device itself to ensure its stable and reliable performance. The technical support and services provided by our can also help users better maintain the equipment.
Data analysis: In depth analysis of experimental data, combined with actual operating conditions, provides a basis for equipment status assessment and predictive maintenance.
Technological upgrade: Pay attention to the technological development within the industry, such as non partial discharge testing, and continuously improve the accuracy and efficiency of testing.
The frequency conversion series resonant withstand voltage device is an indispensable tool to ensure the safe operation of the power grid. Only by choosing a professional manufacturer and mastering scientific usage methods can this’ physical examination specialist ‘truly realize its value.