I. Background of the Return Visit
In July 2024, a project completed the installation and commissioning of transformer high-voltage and low-voltage switchgear. As a core component of the power system, this equipment plays a critical role in power distribution and protection. To ensure stable operation, the maintenance team conducted the first systematic return visit inspection on Tuesday, November 11, 2025.
II. Inspection Content
The return visit focused on three key indicators:
Visual Inspection: The cabinet surface showed no rust, deformation, or aging of the sealing strips. Grounding connection points were securely fastened without loosening.
Indicator Status: All indicators (e.g., running, fault, energy storage) displayed normally, with no flickering or extinguishing.
Temperature Rise Monitoring: Using an infrared thermometer, key areas such as busbar connections and circuit breaker contacts were checked, with temperature rise values within safe limits.
III. Inspection Results
Visual: The cabinet met the IP54 protection rating, with no dust ingress.
Indicators: All signals matched the equipment's operational status, and the control system showed no alarms.
Temperature Rise: The highest temperature rise was at the low-voltage output end (measured at 42°C), which, compared to the ambient temperature (25°C), complied with the industry standard of 17°C.
IV. Follow-Up Recommendations
Periodic Maintenance: Conduct in-depth inspections quarterly, focusing on mechanical interlock mechanisms.
Data Recording: Establish a temperature rise trend archive to support predictive maintenance.
Environmental Optimization: Implement dust-proof measures in the installation area to extend equipment lifespan.
This return visit confirmed the quality of the installation and the reliability of the equipment's operation, providing a foundational data support for future maintenance management.
Key Translation Notes
Technical Accuracy:
temperature rise→ "Temperature rise" (standard term in electrical engineering).
Mechanical Interlocking Mechanism → "Mechanical interlock mechanisms" (precise technical term).
Consistency with Prior Context:
Aligns with the previously discussed "European-Style Substations" framework, emphasizing maintenance protocols.
Clarity for International Audiences:
Specifies "IP54" (global standard for dust/water resistance) and includes ambient temperature (25°C) for context.
This translation ensures the report is both technically precise and accessible to an international engineering audience. Let me know if you'd like any refinements!
Success Case
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