Variable Frequency Series Resonant AC Voltage Proof Equipment

Tunable Frequency Variable Transformer Series Resonant Voltage Resistance Device Product Introduction

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

The device is primarily composed of four major parts: a variable frequency control power supply, an excitation transformer, a reactor, and a capacitor voltage divider. Notably, the reactor features a unique two-piece design, which makes the device more versatile and adaptable to various testing requirements.

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

Low Power Supply Requirement: Since the device utilizes resonance principles to generate high voltage and large current, the power supply only needs to provide the active power 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.

Reduced Size and Weight: By eliminating the bulky high-power voltage regulators and the conventional high-power power-frequency test transformers, the entire unit has become more portable and easier to transport and install. Generally speaking, its size and weight are only a fraction of that of a standard test unit.1/10Please provide the Chinese content to be translated.1/30。

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

To prevent excessive short-circuit current: in series resonance state, once the test item 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 difference between short-circuit current and breakdown current is hundreds of times, effectively protecting the test samples and equipment.

No voltage recovery: When the test specimen is punctured, the high voltage vanishes immediately due to the loss of resonance conditions, and the arc extinguishes instantly. The establishment of voltage recovery is a process of intermittent oscillation involving energy accumulation, which is lengthy and does not result in any over-voltage recovery, thereby ensuring the safety and reliability of the test.

In summary, the tuning-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 hydro turbines. It is an indispensable and crucial device in power system testing and maintenance.