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Reliability verification of safety protection mechanism and insulation oil cooling system for high-voltage polarimeter
Date: 2025-11-22Read: 2
High voltage polarimeterUsed to apply thousands to tens of thousands of volts of direct current electric field to materials such as piezoelectric ceramics and ferroelectric thin films to achieve polarization, its high-voltage operation poses severe safety challenges. Therefore, a sound safety protection mechanism and efficient cooling system are prerequisites for the reliable operation of equipment.
The security protection mechanism includes:
Multiple interlocks: When the cabin door opens, it automatically cuts off the high-voltage output;
Grounding protection: The sample stage and the casing are double grounded to prevent static electricity accumulation;
Overcurrent/overvoltage protection: millisecond level response to cut off abnormal current;
Arc detection: Identify early discharge through high-frequency noise and provide early warning.
The insulation oil cooling system serves two main functions:
Electrical insulation: Transformer oil (such as mineral oil or silicone oil) with a withstand voltage strength greater than 30 kV/mm, isolating high-voltage electrodes;
Heat dissipation and cooling: The polarization process generates Joule heat, which is carried away by the oil circulation to maintain the electrode temperature below 60 ℃.
To verify its reliability, it is necessary to:
Voltage withstand test: no breakdown for 10 minutes at 1.5 times the rated voltage;
Temperature rise test: continuous polarization for 8 hours, oil temperature rise ≤ 15 ℃;
Aging simulation: After accelerated oxidation test, the tangent of oil dielectric loss angle (tan δ) is still less than 0.005.
In practical applications, it is necessary to regularly check the moisture content (<10 ppm) and breakdown voltage of insulation oil to prevent performance degradation. Some equipment uses fluorinated liquid instead of mineral oil, which has high insulation, non flammability, and environmental friendliness.
In conclusion,High voltage polarimeterThe safety and cooling system is not an auxiliary component, but a core guarantee that determines the success or failure of experiments and personnel safety. Only through strict verification and standardized maintenance can the stable preparation of high-performance functional materials be supported.