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