What operations are involved in tightening the transformer enclosure?

Core tightening is a critical procedure to ensure the stable and reliable operation of transformer equipment. This operation involves various aspects to ensure that all components of the equipment are properly fixed and adjusted, thereby enhancing the transformer’sperformance andsafety. The following are the main steps for core tightening:

Content

●Tightening of Yoke Bolts and Foot Pads

The initial step involves re-tightening the bolts and foot pads of the upper and lower yokes. This process includes checking and tightening allboltsandnuts. Special attention must be given to thecorrect placement of washers during tightening. Washers serve to distribute pressure evenly and prevent localized stress concentration, which can lead to damage or loosening of the bolt connections. Verify the tightness of the bolts to ensure they meet the torque specifications as per the design requirements, thereby ensuring the stability of the yoke and the integrity of the overall structure.

●Tightening of Strap Nuts and Locking Nuts

When tightening the strap nuts and locking nuts, ensure thatthe strap insulation is correctly positioned. This is crucial because the straps must not only be secured adequately but also ensure that the insulation material is not compressed or deformed, which could adversely affect insulation performance. Inspect the positioning of the straps and the state of insulation to ensure they are configured according to design specifications, thereby enhancinginsulation reliability andpreventing leakage current issues.

●Tightening of Wire Clamps, Brackets, and Covers

Ensure that allwire clamps, wooden and metal brackets, and the surrounding iron bolts and insulation bolts are properly tightened and secured. Particularly, the exposed portions of all insulation bolts should be uniform to avoid insulation failure or structural instability due to uneven bolt height. Use specialized tools to tighten each bolt to the specified torque to improve the overallstability andsafety of the equipment.

●Axial Compression of the Core

Proper methods must be employed to ensure structural stability during axial compression of the core. For transformersusing pressing nail structures, the compression process should be carried out symmetrically on both high-voltage and low-voltage sides to prevent deformation of the coils due to uneven pressure. The axial compression operation should be performed in at least two cycles to ensure uniform force distribution across all pressing nails. For transformerswith pressing block structures, the required pressure can be achieved in one go according to design requirements. Using simultaneous compression devices can significantly improve operational efficiency and reduce time consumption.

●Tightening of Metal Bolts

When tightening metal bolts for wire and electrode connections, usea specialized torque wrench andfollow the prescribed torque values. This ensures the reliability of the connections and the stability of electrical contact, preventing electrical faults or safety hazards caused by loose bolts or poor contact. Regularly inspect and adjust the tightening status of metal bolts to maintain the normal operation of the transformer.

In summary

Core tightening operations areessential for ensuring the proper functioning and long-term stability of transformer equipment. By accurately tightening the upper and lower yoke bolts, strap nuts, wire clamps, brackets, covers, and metal bolts, as well as effectively compressing the core axially, equipment failures due to loosening or improper installation can be effectively avoided.Strict adherence to operational standards during tightening ensures the structural stability and electrical performance of the transformer, forming the foundation for efficient and safe operation.

Contact Us

LuShan, est.1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase transformers, DC inductors, AC reactors, filtering reactor, expoxy resin high-voltage transformer and intermediate, high-frequency products.Our transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering, central air conditioning.

Know more about power transformer and reactor :www.lstransformer.com