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Key Construction Points for Power Engineering: Common Issues in the Installation and Commissioning of Transformers and Complete Sets of Equipment, and How to Avoid Them
Even the highest-quality high- and low-voltage electrical equipment can harbor long-term safety hazards if on-site installation and commissioning are not performed according to standards. In many substation projects, faults stem not from equipment quality but from inadequate on-site construction practices. This summary of common on-site issues with transformers, switchgear, and packaged substations helps contractors mitigate risks.
Transformer installation: For dry-type transformers, verify enclosure protection and ensure air ducts are free of obstructions; confirm proper wiring of forced‑air cooling fans and accurate settings of temperature controllers. After positioning oil‑immersed transformers, inspect seals to prevent oil leakage and complete core‑lifting or oil‑impregnation tests. The grounding system is critical: the transformer neutral point and enclosure must be reliably grounded, with grounding resistance meeting design specifications. The installation environment for dry‑type transformers should avoid areas with standing water or severe corrosive gases.
High- and low-voltage switchgear installation: Cabinet sections must be vertically aligned during assembly, and busbar connections must be tightened to the specified torque in accordance with standards; insufficient tightening is the most common cause of overheating in complete switchgear. Secondary control wiring shall be neatly arranged, with shielded cables properly grounded. High-voltage equipment must undergo withstand voltage and partial discharge tests. Protection device settings shall be adjusted according to the drawings, followed by functional testing to verify correct tripping and alarm logic. For outdoor pad-mounted substations and switchgear stations, ensure thorough waterproof sealing and unobstructed drainage from cable trenches to prevent rainwater from entering the enclosures.
After the packaged substations and prefabricated cabins arrive on site, they must not be energized immediately. First, inspect for any internal component displacement or loosening caused by transportation, and complete functional tests of the temperature control and fire protection systems before proceeding with handover tests. Additionally, upon completion of construction, ensure that all documentation is properly filed, including factory test reports, test records, and as-built drawings, to facilitate subsequent operation, maintenance, and inspection.
Power construction should not prioritize schedule at the expense of quality; handover testing must not be skipped. Shenyang Guangchangyun’s power business encompasses both the manufacturing of transformers and high- and low-voltage switchgear, as well as the execution of associated electrical installation projects. Offering end-to-end services—from equipment production and electrical design to on-site installation and commissioning—the company is well-versed in the specific requirements of steel, chemical, real estate, and new-energy projects, helping to minimize potential risks on site.
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