Prior to formal installation, a rigorous handover test and equipment inspection must be conducted to ensure all components meet technical benchmarks. The test results for power dry-type transformers and their associated accessories—including electrical performance adjustments and mechanical structure checks—must fully align with national electrical engineering standards (e.g., IEC 60076 series) and the manufacturer’s technical guidelines.
High-voltage and low-voltage porcelain components are critical insulation elements, so they must be free from cracks, chips, or enamel degradation. Even minor surface imperfections can compromise insulation integrity, leading to electrical breakdown under operational loads or environmental stress.
The transformer body itself requires meticulous inspection: installation positioning must be precise (with horizontal and vertical alignment verified using professional tools), the exterior surface must be free of dust, oil stains, or debris, and the paint coating should be intact, uniform, and free from peeling or corrosion. Any signs of paint damage should be addressed promptly with manufacturer-approved touch-up materials to prevent rust and maintain structural protection.
Special protective measures must be implemented for high-voltage/low-voltage bushings and epoxy resin castings during installation. These components are brittle and prone to damage from impacts or falling objects, so dedicated shielding (e.g., temporary plastic covers, foam padding) should be installed until the installation is finalized. Additionally, the transformer body must remain clean throughout the process—any collision-induced paint damage should be repaired immediately, and after the unit is positioned, strict safeguards must be in place to prevent metal shavings, screws, or other ferromagnetic debris from entering the coil assembly, as such contaminants can cause short circuits or overheating.
Safety protocols for on-site operators are equally critical. During installation work, personnel must not step directly on the transformer body or its insulation components, as this can damage internal windings or compromise structural integrity. All tools and materials must be carried in closed tool bags to avoid accidental drops that could scratch, dent, or otherwise damage the transformer’s exterior or internal components.
To ensure a smooth and compliant installation, the following on-site conditions must be fully met before commencing work:
Complete and Accurate Documentation: All construction drawings, technical specifications, manufacturer’s installation manuals, and quality certification documents must be compiled, reviewed, and readily accessible. This includes detailed diagrams of wiring configurations, base dimensions, and load-bearing requirements to avoid misalignment or incorrect assembly.
Qualified Civil Engineering Foundations: Civil engineering works related to the transformer installation site must be fully completed. Embedded parts (e.g., anchor bolts, mounting plates) must be inspected to confirm they meet design requirements for elevation accuracy, dimensional precision, structural stability, and load-bearing capacity—this ensures the base can safely support the transformer’s weight and resist vibration during long-term operation.
Weatherproof and Enclosed Environment: The building’s roof structure and exterior wall finishing (including waterproofing treatments) must be fully completed, with no signs of water leakage. All doors, windows, and glass panels should be installed and sealed to protect the transformer from dust, moisture, or external debris during installation and subsequent operation.
Prepared and Accessible Worksite: Indoor rough flooring must be finished, and the installation area must be thoroughly cleaned of construction waste, dust, or obstacles. Access routes for equipment transportation and personnel movement should be smooth and unobstructed, with sufficient space for tools, materials, and assembly activities to ensure efficient and safe workflow.
These specifications and prerequisite conditions represent industry-proven best practices for dry-type epoxy encapsulated transformer installation. By adhering to these guidelines, installers can minimize the risk of installation-related failures, ensure compliance with international safety and performance standards, and optimize the transformer’s operational reliability and service life. For project-specific scenarios or complex installation environments, it is recommended to engage certified electrical engineers to conduct on-site assessments and provide tailored guidance, further enhancing the safety and effectiveness of the installation process.
