Variable Frequency Series Resonant Voltage Withstand Device

Product Introduction: Tuned Resonant Series-Connected Voltage Stabilization Device

The Tuning Mode Variable Frequency Series Resonant Voltage Withstand Device is a withstand test equipment specifically designed for high-voltage electrical equipment, particularly suitable for...11kV/30MWAC withstand voltage test for hydro-generator turbines. The core of this device lies in achieving resonance with the tested equipment by adjusting inductance, thereby generating high voltage and large current on the equipment for the voltage endurance test.

The unit is primarily composed of four major parts: a variable frequency control power supply, an excitation transformer, a reactor, and a capacitance divider. Notably, the reactor features a unique two-piece design, which enhances the unit's flexibility and adaptability to various testing requirements.

The Sensing-type Variable Frequency Series Resonant Voltage Withstand Device boasts numerous advantages in the power system:

Low Power Supply Requirement: Due to the device utilizing resonance principles to generate high voltage and high current, the power supply only needs to provide the active consumption part of the system. Therefore, the power supply power required for the test is only a fraction of the test capacity.1/QSignificantly reduced the power capacity requirements.

The device has become more portable and easier to transport and install due to the elimination of bulky high-power voltage regulators and standard high-power power frequency test transformers. Generally speaking, its volume and weight are only a fraction of those of conventional test equipment.1/10Please provide the Chinese content you would like translated into American English.1/30。

Output Waveform Optimization: The resonant circuit in the device effectively reduces the waveform distortion of the output voltage, achieving a purer sine waveform. This prevents the harmonic peak from causing accidental breakdown in the tested sample.

To prevent excessive short-circuit current: in series resonance condition, once the sample experiences insulation breakdown, the circuit will immediately detune, and the loop current will rapidly drop to the normal test current level.1/QCompared to parallel resonance or test transformer methods, the short-circuit current differs hundreds of times from the breakdown current, effectively protecting the test item and the testing equipment.

No Recovery Overvoltage: When the test specimen is punctured, the high voltage will immediately disappear due to the loss of resonance conditions, and the arc will extinguish immediately. The process of establishing recovery voltage is an intermittent oscillation of energy accumulation, which is relatively long and does not result in any recovery overvoltage, thereby ensuring the safety and reliability of the test.

In summary, the tuning fork-type variable frequency series resonance voltage withstand device, with its high efficiency, portability, safety, and reliability, is widely used in the power system for AC withstand tests of various high-voltage electrical equipment, particularly in large-scale equipment such as hydro-generator sets. It is an indispensable and crucial device in power system testing and maintenance.