Proper installation of transformers is crucial for operational safety and efficiency. Here are essential guidelines for transformer installation:
Support and Stability
- Oil-immersed transformers should be securely installed on raised sleepers to prevent contact with the ground.
- Dry-type transformers require stable horizontal placement on shockproof rubber pads (minimum 30mm thick) to reduce noise.
Bushing and Components
- Ensure smooth, crack-free bushing surfaces post-installation.
- Verify complete installation of bushing pressure bolts and integrity of transformer box to prevent oil leaks.
Bracket Construction
- Brackets for transformer inlet and outlet must adhere to design specifications.
- Maintain elevation and horizontal alignment within 5mm tolerance.
- Ensure reliable connection to the grounding grid.
Cable Management
- Seal high and low voltage cable trenches against fire and small animals.
- Use appropriate terminal components and ensure clean, oxide-free connections with power compound grease.
Grounding Requirements
- Grounding wire cross-section should be adequate (minimum 70mm²).
- Independently connect oil-immersed transformer box and neutral point grounding wire to the main grounding grid with secure crimping or welding.
Safety Measures
- Insulate exposed live parts effectively with high and low voltage insulation sheaths.
- Avoid using magnetic wire metal binding for single-core cable fixation.
Electrical Connections
- Use galvanized bolts with flat washers and spring washers for high and low voltage wiring connections.
- Leave a thread exposure of 2 to 3 after tightening bolts.
Phase and Operation Checks
- Ensure correct phase alignment and clear phase color markings for high and low voltage wiring.
- Verify normal oil level through the gauge and release valve pressure before commissioning fully sealed transformers.
Safety Precautions
- Install firefighting equipment per design specifications.
- Non-enclosed transformers should have fixed fences with proper dimensions and safety signs.
Fan and Motor Operation
- Securely install fan motors and blades ensuring smooth rotation without obstruction or vibration.
- Verify correct phase sequence for three-phase power supply to prevent fan malfunction.
- Ensure temperature control devices operate accurately.
Adherence to these technical requirements ensures the safe and efficient installation of transformers, optimizing their performance and longevity in electrical systems.
