Variable Frequency Series Resonant Resonance Test

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

The device 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 device's flexibility and adaptability to various testing requirements.

The tuned resonant series-parallel voltage regulating device offers numerous advantages in power systems:

Low Power Supply Capacity Requirement: Due to the device's use of resonance principle to generate high voltage and large 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 requirements for power capacity.

Volume and Weight Reduction: By eliminating the bulky high-power voltage regulators and the standard high-power power frequency test transformers, the entire unit has become lighter and easier to transport and install. Generally speaking, its volume and weight are only a fraction of those of a conventional test unit.1/10Please provide the Chinese content you would like translated into American English.1/30。

Output Waveform Optimization: The resonant circuit within the device effectively reduces the waveform distortion of the output voltage, resulting in a purer sine wave. This, in turn, avoids potential misbreakdown of the sample due to harmonic peak values.

Preventing Overcurrent Short Circuits: In series resonance, once the specimen experiences insulation breakdown, the circuit will immediately detune, and the loop current will rapidly decrease to the normal test current level.1/QCompared to parallel resonance or test transformer methods, the short-circuit current differs from the breakdown current by hundreds of times, effectively protecting the test item and testing equipment.

No voltage recovery: 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 establishment of the recovery voltage is a process of intermittent oscillation involving energy accumulation, which is lengthy and does not result in any overvoltage recovery, ensuring the safety and reliability of the test.

In summary, the Sensing-Type Variable Frequency Series Resonant Voltage Withstand Device, with its efficient, lightweight, safe, and reliable features, is widely applied in the power system for AC withstand tests of various high-voltage electrical equipment, particularly in large-scale equipment such as hydraulic turbines. It is an indispensable important device in the testing and maintenance of the power system.