Transformer Pressure Relief Valve - Key Non-Electrical Protection Device for Oil-immersed Transformers

Date: July 16, 2025 10:27:58

transformerspressure relief valve(Pressure Relief Valve, PRV) is the oil-immersed transformer'sCritical non-electrical protective devicesThe following is an example of a pressure spike caused by an internal malfunction.Quick release of stressIt prevents the tank from deforming or exploding, and safeguards the safety of equipment and people.
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✅ Core Role and Rationale

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functionality descriptive
Quick Pressure Relief When the internal pressure reaches the set opening value (e.g. 55 kPa), the valve is in theWithin 2 millisecondsInstantaneous opening to release gas and oil vapors.
automatic reset The valve closes automatically after the pressure drops to the closing value (e.g. 35 kPa), thePrevents air and moisture from entering the tank, to maintain the seal.
signal output Triggers the micro switch when it moves, emittingAlarm or trip signal, enabling remote monitoring and control.

🎯 Installation location and requirements

  • mounting position: usually located in the transformerTop cover near tank endsmaybeDirectly above the windingThe leakage airways are avoided to minimize malfunctions.
  • Orientation requirements: The valve body exhaust port should faceNo personnel access or equipment areasTo avoid injuries from oil spraying.

🧪 Calibration and test standards

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sports event Based on criteria staple
Turn on the stress test T/CEC 355-2020 Verify that the valve opens accurately at the set pressure.
Shutdown stress test JB/T 7065-2015 Verify that the valve resets and seals well without leakage.
Sealing performance test JB/T 7069-2004 Hold pressure at 1.1 times closing pressure and check for oil leaks.

⚠️ Common Troubleshooting and Handling

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impunity Possible causes cure
malfunction Mounting position near magnetic leakage area or spring fatigue Adjust the position or replace the spring.
inactivity Spool jamming or high set pressure Disassemble for cleaning or recalibrate opening pressure.
inject oil Pressure spike due to internal short circuit failure Immediately de-energize and inspect the transformer body.

📌 Selection Example

  • Model Example:: YSF16-55/130KKJ
    • Cracking Pressure: 55 kPa
    • Closing Pressure: 35 kPa
    • a thoroughfare: 130 mm (for high-capacity transformers).
For on-site testing, use theCalibration deviceSimulates operating pressure to ensure reliable valve performance.
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