Causes and Measures for Abnormal Transformer Temperature
Many transformer faults are often accompanied by temperature changes. The upper oil temperature of the transformer should not exceed 95℃, and the temperature rise should not exceed 55℃. The main causes and measures for abnormal transformer temperature are:
Internal Transformer Faults
- Cause: Core multi-point grounding and bare metal overheating.
- Measure: Identify and address the internal faults.
Radiator Door Not Opened
- Cause: After new installation or overhaul, the radiator door is not opened, preventing normal heat dissipation.
- Measure: Check the operation of the oil pump and flow meter, and open any closed doors.
Blocked or Leaking Respirator
- Cause: Blockage or severe oil leakage affects heat dissipation.
- Measure: Ensure the respirator is clear and repair any leaks.
Unreasonable Transformer Structure
- Cause: Magnetic leakage causing local overheating of the box shell, sometimes reaching hundreds of degrees.
- Measure: Install magnetic isolation materials in specific parts.
Cooling Device Malfunction
- Cause: Cooling device not operating normally, affecting heat dissipation.
- Measure: Ensure the cooling device is functioning properly.
By addressing these causes and implementing the corresponding measures, abnormal transformer temperatures can be effectively managed to prevent further issues.
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What are the common transformer faults?
Transformer faults include coil faults, core overheating, conductive loop overheating, bushing failures, on-load tap changer issues, cooler failures, oil cabinet breathing problems, and high-voltage reactor specific faults.