Variable Frequency Series Resonant AC Withstand Voltage Test Device/AC Resonance Test Equipment - Test Precautions? The test precautions for AC resonance test equipment are as follows:

I. Detailed Preparation Before the Test

1. Parameter Matching Calculation: Accurately estimate or measure the capacitance of the test sample, calculate the expected resonant frequency, and accordingly select appropriate reactor combinations and taps to ensure the system resonant point falls within the equipment's operating frequency range. This is a prerequisite for a successful test.

2. System Inspection and Grounding: Check that the excitation transformer, reactors, voltage dividers, and other components are in good condition and reliably connected. The entire system must achieve reliable grounding at one point, and the grounding wire cross-sectional area must be sufficient to ensure safety and reduce interference.

3. Safe Distance: Ensure the high-voltage lead is securely connected and maintain a sufficient safe distance from other grounding bodies.

II. Precise Control of the Test Process

1. Low Voltage Tuning: The frequency must be slowly adjusted under low excitation voltage (usually 10%-20% of the test voltage), closely observing changes in output voltage and current to accurately find the resonant point (the point of maximum current). High-voltage addressing is strictly prohibited.

2. Smooth Voltage Increase and Monitoring: After the resonant point is locked, maintain a stable frequency and smoothly increase the excitation voltage. Closely monitor the high-voltage, loop current, and frequency synchronously throughout the process.

3. Abnormal Handling: If flashover breakdown occurs in the test specimen, the resonant condition disappears, and the loop current automatically decreases, providing a natural current-limiting function. However, the operator must still immediately and quickly reduce the voltage and disconnect the power supply.

III. Safe Post-Test Conclusion

• After the test is completed and power is disconnected, a dedicated discharge rod must be used to fully discharge the test specimen (especially large capacitor equipment). Discharge should first be performed through a resistor, then directly short-circuit to ground.

Summary: The core principles are "precise matching, low-voltage tuning, and smooth operation." Strictly follow the procedures to ensure the safety and effectiveness of the test. The MSXB-F-540kVA 270kV AC Resonant Test Equipment is primarily designed for AC withstand voltage tests of 10kV, 35kV, and 110kV cables, 110kV main transformers, GIS equipment, and circuit breakers. It has a wide range of applications and is an ideal withstand voltage test device for municipal, county-level high-voltage testing departments and power installation and maintenance engineering units.

The resonant AC withstand voltage test equipment mainly consists of a frequency converter, excitation transformer, reactor, capacitive voltage divider, and compensation capacitors.

1. 110kV circuit breaker, GIS, test frequency 30-300Hz, test voltage 265kV, test time 1min

2. 0.7km of 110kV/400mm² cable, capacitance ≤0.115uF, test frequency 30-300Hz, test voltage 128kV, test time 60min

3. Fully insulated 110kVA/80000kVA main transformer, capacitance ≤0.02uF, test frequency 45-65Hz, test voltage 160kV, test time 1min

4. 8km of 10kV/300mm² cable Capacitance ≤ 3.004uF, test frequency 30-300Hz, test voltage 17.4kV, test time 60min

4km of 5.35kV/300mm² cable, capacitance ≤ 0.778uF, test frequency 30-300Hz, test voltage 52kV, test time 60min

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