Features and Advantages

1. This equipment incorporates various protection functions, including overvoltage, overcurrent, zero-start interlock, and system detuning (flashover) protection. The thresholds for overvoltage and overcurrent protection can be configured according to user requirements. In the event of a flashover in the test object, the system activates flashover protection measures and records the flashover voltage value for subsequent test analysis.

2. The entire unit is lightweight and designed for easy deployment and operation in the field.

3. The equipment offers three distinct operating modes: Fully Automatic Mode, Manual Mode, and Automatic Tuning with Manual Boosting Mode. Users can flexibly select the most suitable mode based on specific field conditions, thereby accelerating the testing process.

4. The device allows for the storage and printing of data from various test points. Each stored data record is assigned a unique numerical ID, facilitating easy identification and retrieval by the user.

5. When the equipment performs an automatic frequency sweep, the starting point of the frequency scan can be arbitrarily set within a specified range, and the scanning direction (upward or downward) can be selected as desired. Simultaneously, the LCD screen displays the frequency sweep curve, providing a visual aid that allows users to intuitively determine whether the resonance point has been successfully identified.

6. Leveraging DSP platform technology, the system allows for the addition or removal of specific functions—as well as future software upgrades—to meet evolving user needs. Furthermore, the human-machine interface is designed to be highly user-friendly and intuitive.

7. The required power capacity is significantly reduced. The series resonance power supply generates high voltage and high current by utilizing the resonance phenomenon between the resonance reactor and the capacitance of the object under test. Within this integrated system, the power supply unit is only required to provide the active power consumed by the system; consequently, the input power required for the test is merely 1/Q times the total test capacity.

8. The weight and physical dimensions of the equipment have been drastically reduced. In this series resonance configuration, bulky, high-power voltage regulators and conventional high-power frequency-doubling transformers are eliminated. Since the resonance excitation power supply needs to provide only 1/Q times the test capacity, the overall weight and volume of the system are substantially reduced—typically ranging from 1/10 to 1/30 of the size of conventional testing equipment.

9. The output voltage waveform is effectively improved. The resonance power supply functions as a resonant filtering circuit, which mitigates waveform distortion in the output voltage to produce a pure sinusoidal waveform. This effectively prevents premature breakdown of the test object caused by transient harmonic peaks.

10. The risk of burning out fault points due to excessive short-circuit current is eliminated. In the event that an insulation weakness within the test object breaks down while the system is in a state of series resonance, the circuit immediately detunes; as a result, the circuit current rapidly drops to a level equal to 1/Q times the normal test current. When conducting withstand voltage tests using parallel resonance or test transformers, the breakdown current increases immediately—often by several orders of magnitude. In comparison, the short-circuit current and the breakdown current differ by a factor of several hundred. Series resonance enables the effective detection of insulation weaknesses without the concern that a large short-circuit current might burn out the fault point.

11. No recovery overvoltage occurs. When the test object experiences a breakdown due to the loss of resonance conditions, the high voltage vanishes instantly, and the electric arc is immediately extinguished. The process of voltage recovery is relatively slow; therefore, it is easy to disconnect the power supply before the voltage returns to the flashover level. This voltage recovery process is an intermittent, energy-accumulating oscillation process of relatively long duration, and it does not result in recovery overvoltage.

Technical Parameters