Features and Advantages

1. This equipment incorporates protection functions against overvoltage, overcurrent, zero-start conditions, and system detuning (flashover). The protection thresholds for overvoltage and overcurrent 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, Manual, and Automatic Tuning with Manual Boosting. 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. Stored data records are assigned sequen

tial numerical identifiers, facilitating easy identification and retrieval by the user.

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

6. Leveraging DSP platform technology, the system allows for the addition or removal of functions—as well as software upgrades—to meet evolving user needs; furthermore, the human-machine interface is highly user-friendly. 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 test object. Within the entire system, the power supply is only required to provide the active power consumed by the circuit; consequently, the input power required for the test is merely 1/Q of the total test capacity.

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

9. The output voltage waveform is effectively improved. Acting as a resonant filtering circuit, the power supply mitigates waveform distortion in the output voltage, producing a clean sinusoidal waveform. This effectively prevents accidental dielectric breakdown at harmonic voltage peaks within the test object.

10. The risk of burning out fault points due to excessive short-circuit current is eliminated. In the event of a dielectric breakdown at an insulation weak point within the test object while in the series resonance state, the circuit immediately detunes; consequently, the circuit current rapidly drops to just 1/Q of 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.