The fundamentals of routine iron core maintenance lie in conducting thorough visual inspections and environmental assessments to promptly eliminate external hazards. Operations and maintenance personnel must regularly monitor the transformer's operating status, checking for moisture, dust, or oil accumulation on the core, as well as signs of water ingress or condensation inside the equipment. Heavy deposits of dust or impurities on the silicon steel laminations can impair heat dissipation and accelerate the aging of the insulation coating; therefore, timely cleaning is essential to maintain cleanliness. Inspectors should also check for defects such as curled edges, deformation, rust, or coating delamination. Minor rust spots require immediate anti-corrosion treatment to prevent minor issues from escalating, thereby ensuring the stability of the core structure and magnetic circuit against environmental factors.
Regularly inspecting the core's fastening and insulation status is crucial for preventing equipment malfunctions caused by abnormal noise or overheating. Transformers subjected to prolonged electromagnetic vibration may experience slight loosening of fastening clamps, tie straps, and bolts. This can widen the gaps between laminations and intensify core vibration, leading to increased operating noise and magnetic flux leakage. Inspections must include a systematic check of fastening components; loose parts should be tightened evenly to ensure the core laminations remain tightly compressed and the mechanical stress balanced. Additionally, periodic testing of inter-laminar and core-to-ground insulation-along with checks for aging or damage to insulation spacers and bushings-is vital. These measures prevent hazards such as inter-laminar short circuits and multi-point grounding, which could otherwise cause excessive eddy currents, localized overheating, and a sharp rise in power losses.
Effective monitoring of the core's grounding status and periodic specialized testing are essential to ensure the equipment's long-term, safe, and stable operation. The core must maintain a proper single-point grounding configuration. Maintenance routines should focus on verifying that grounding straps are securely connected, free from rust, and intact, while eliminating issues like loose connections, multi-point grounding, or floating grounds that could lead to floating potentials, partial discharge, or overheating faults. During scheduled overhauls, key parameters-such as no-load loss, temperature rise, and noise levels-must be tested and compared against standard values to verify that the core's performance remains within normal limits. At the same time, by taking equipment operating loads into account and preventing long-term overload-which can lead to magnetic core saturation and accelerated insulation aging-the service life of the core is effectively extended through routine maintenance and periodic calibration, ensuring the transformer's efficient and stable operation.
