Variable Frequency Series Resonant Complete Set Equipment

Introduction to Tuned Resonant Series Voltage Stabilization Device

The Tuned Sensing 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 withstand voltage test.

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

The tuning-type variable frequency series resonance voltage withstand device boasts numerous advantages in power systems:

Low Power Supply Requirement: Since the device generates high voltage and large current by utilizing the resonance principle, the power supply only needs to provide the active consumption part within the system. Therefore, the power supply power required for the test is only a fraction of the test capacity.1/QSignificantly reduces the power capacity requirements.

Volume and Weight Reduction: By eliminating the bulky high-power voltage regulators and the conventional 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 that of a standard 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 waveform distortion of the output voltage, yielding a purer sine wave. This, in turn, prevents potential误击穿 caused by harmonic peak values on the specimen.

Preventing Excessive Short-Circuit Current: In series resonance, once the test item 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 by 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 immediately disappears due to the loss of resonance conditions, and the arc is instantly extinguished. The process of establishing recovery voltage is an intermittent oscillation of energy accumulation, which is lengthy and does not result in any recovery overvoltage, 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 power systems for AC withstand tests of various high-voltage electrical equipment, particularly for large-scale equipment such as hydraulic turbines. It is an indispensable and important device in power system testing and maintenance.