Variable Frequency Series Resonant Voltage Test Device

Introduction to the Tuning-Type Variable Frequency Series Resonant Voltage Withstand Device

The Tuning Fork Type Variable Frequency Series Resonant Voltage Proof Device is a voltage proofing 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 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 flexible and adaptable to various testing requirements.

The Tuning-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 large current, the power supply only needs to provide the active power consumption of the system. Therefore, the power supply power required for the test is only a fraction of the test capacity.1/QSignificantly reduced power capacity requirements.

Volume and Weight Reduction: By eliminating the bulky high-power voltage regulators and the standard high-power power frequency test transformers, the entire unit becomes more portable and easier to transport and install. Generally speaking, its volume and weight are only a fraction of those of a standard test unit.1/10Please provide the Chinese content to be translated.1/30。

Output Waveform Optimization: The resonant circuit in the device effectively improves the waveform distortion of the output voltage, yielding a purer sine wave, thereby avoiding potential误击穿 due to harmonic peak values.

Prevent Excessive Short-Circuit Current: In series resonance, once the specimen 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 by hundreds of times from the breakdown current, effectively protecting the test items and equipment.

No voltage recovery: When the test sample is punctured, the high voltage immediately disappears due to the loss of resonance conditions, and the arc is instantly extinguished. The process of establishing voltage recovery is an intermittent oscillation of energy accumulation, which is lengthy and does not result in any overvoltage recovery, thereby ensuring the safety and reliability of the test.

In summary, the Tuning Fork-Type Variable Frequency Series Resonant Voltage-withstanding Device, with its high efficiency, portability, safety, and reliability, is widely used in power systems for AC voltage withstand tests of various high-voltage electrical equipment, particularly in large-scale equipment such as hydro turbines. It is an indispensable and crucial device in power system testing and maintenance.