Partial Discharge-Free AC Resonant Test System/Partial Discharge-Free Series Resonant Test Device - Test Precautions? Test Precautions for Partial Discharge-Free Series Resonant Test Device:

I. Precise Preparation Before the Test

1. Parameter Estimation and Matching: Accurately calculate the capacitance of the test sample, reasonably configure the reactor combination and taps, and ensure that the resonant frequency is within the allowable range of the device. This is the foundation for a successful test.

2. Check Grounding and Insulation: The casings and common grounding terminals of all components of the device (excitation transformer, reactor, voltage divider) must be reliably grounded at one point, and the cross-sectional area of the grounding wire must be sufficient. Check that the insulating surfaces of each component are clean and dry.

3. Connection Reliability: All connecting wires (high voltage lines, reactor connecting wires, measuring cables) should be securely connected, with sufficient safe distance from ground. Measuring lines should be kept away from strong interference sources to reduce background partial discharge.

4. Confirm Status: If it is a gas-filled device, confirm that its gas pressure is within the rated range.

II. Precise Control of the Test Process

1. Slow Tuning: Under a lower excitation voltage, slowly adjust the frequency to find the resonant point. 1. The phenomenon observed is a significant increase in loop current and a corresponding increase in the test sample voltage, indicating resonance.

2. Synchronous Monitoring of Multiple Parameters: During resonance voltage boosting, the high-voltage side voltage, loop current, frequency, and critical partial discharge quantity must be closely monitored simultaneously. Any abnormality in any parameter requires immediate attention.

3. Utilizing Q-value Advantage: After resonance, the voltage should be steadily boosted to the target value. Due to the "resonance boost" characteristic, the excitation voltage is much lower than the output high voltage, resulting in a relatively small risk of overvoltage, but rapid rises and falls must still be avoided.

4. Immediate Stop in Case of Abnormalities: If the test sample experiences flashover or breakdown, the resonance condition is disrupted, the loop current drops sharply, and the voltage drops. The device has inherent current-limiting protection characteristics. However, the excitation voltage must still be immediately reduced to zero and the power supply disconnected.

III. Post-Test Operation Procedures

• After the test is completed and the voltage is reduced and the power is disconnected, the test sample must be fully discharged. For large-capacity test samples, a dedicated discharge rod should be used to discharge through a resistor before directly short-circuiting to ground.

In summary, the core principle lies in precise tuning, utilizing resonant characteristics, and relying on a partial discharge monitoring system for real-time insulation condition diagnosis throughout the process to ensure safe and effective testing. The MSWJXZ partial discharge-free series resonant test device and partial discharge-free induced withstand voltage resonant test system can be used for AC withstand voltage tests and partial discharge tests on all electrical equipment. It utilizes an excitation transformer to excite a series or parallel resonant circuit. By adjusting the output frequency of the variable frequency power supply, the inductance L of the reactor and the capacitance C of the test object in the circuit resonate, and the resonant voltage is the voltage applied to the test object. Alternatively, it can be directly output to the primary winding of an intermediate transformer for induced withstand voltage testing. Keywords: partial discharge-free induced withstand voltage resonance, partial discharge-free induced withstand voltage resonant test system, partial discharge-free variable frequency series resonance, partial discharge-free series resonance test device, partial discharge-free variable frequency series resonance, partial discharge-free AC resonant test system, resonant test system with partial discharge.