Daily maintenance of transformers typically involves the following tasks:

  • Visual Inspection: Check for any signs of oil leakage, discoloration, loose connections, or abnormal noise or vibrations.
  • Temperature Monitoring: Monitor the temperature of the transformer using temperature sensors or infrared thermography to ensure it is within normal operating limits.
  • Oil Level Check: Verify the oil level in the transformer's conservator tank and ensure it is within the recommended range.
  • Cooling System Inspection: Inspect cooling fans or radiators for proper operation and cleanliness. Remove any debris or obstructions that could hinder airflow.
  • Bushing Inspection: Examine the condition of the bushings for signs of damage, cracks, or leaks.
  • Insulation Resistance Measurement: Conduct insulation resistance tests using a megohmmeter to check for any insulation degradation.
  • Electrical Connections: Visually inspect electrical connections for signs of looseness or corrosion. Tighten any loose connections if necessary.
  • Control and Protection Systems: Check the operation of control and protection systems, such as relays, alarms, and temperature controllers, to ensure they are functioning properly.
  • Grounding Check: Verify the integrity of the grounding system by inspecting ground connections and conducting grounding resistance tests.
  • Cleaning: Keep the transformer and its surroundings clean by removing dirt, dust, and debris that could affect its performance or lead to overheating.
  • Record Keeping: Maintain a logbook to record daily observations, maintenance activities, and any abnormalities observed during inspections.
  • Alarm and Monitoring Systems: Check the operation of alarm and monitoring systems, such as oil level indicators, temperature alarms, and pressure gauges. Ensure that they are functioning correctly and respond promptly to any abnormal readings or alarms.
  • Gas Analysis: Perform daily gas analysis on oil-immersed transformers equipped with gas monitoring devices. Monitor the levels of combustible gases, such as hydrogen, carbon monoxide, and methane, which can indicate potential faults or issues within the transformer.
  • Bushing Temperature Measurement: Measure the temperature of the bushings using infrared thermography or temperature probes to detect any abnormal heating that could indicate insulation problems or loose connections.
  • Air Ventilation: Check the ventilation system to ensure proper airflow around the transformer, especially in enclosed spaces or rooms. Clear any obstructions or blockages that could hinder air circulation.
  • External Insulation: Inspect the external insulation of the transformer, such as bushings, cables, and connectors, for any signs of damage, cracking, or degradation. Address any issues promptly to maintain insulation integrity.
  • Oil Sampling: Collect oil samples for routine analysis to monitor the condition of the transformer's insulating oil. This helps assess the oil's dielectric strength, moisture content, and presence of contaminants or degradation byproducts
  • Security Measures: Ensure that the transformer and its surroundings are secure from unauthorized access or vandalism. Check fences, gates, and security systems regularly.
  • Documentation and Reporting: Maintain comprehensive records of daily maintenance activities, observations, and any abnormalities detected. Report any significant findings or concerns to relevant personnel or supervisors.
  • Training and Safety: Stay updated with training on transformer maintenance and safety protocols. Adhere to proper safety procedures when working with transformers, including the use of personal protective equipment (PPE) and following lockout/tagout procedures.

Remember that these tasks serve as general guidelines, and specific maintenance requirements may vary depending on the transformer's design, age, and operational conditions. Regular inspections, adherence to manufacturer recommendations, and compliance with industry standards are essential to ensure the reliable and safe operation of the transformer.

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