What Key Points To Check Before Connecting High Voltage Transformer With Distribution Cabinet
Improper connection between high voltage transformer and distribution cabinet is one of the top causes of early equipment failure, local overheating and short circuit accidents. Many construction teams only focus on finishing wiring speed while ignoring standardized connection specifications, triggering hidden safety hazards during long term grid operation. This article sorts out all necessary inspection points before wiring construction, guiding construction teams to complete standard connection work of high voltage transformer.
Copper busbars or multi core copper cables are the only qualified conductors for high voltage transformer and distribution cabinet connection. Aluminum conductors cannot be used in this connection link, because aluminum has higher resistance and is easy to oxidize after long term operation, leading to contact heating and even melting accidents. The cross section of selected copper conductors must match the rated current of high voltage transformer, and reserved current surplus capacity should be set according to peak load. If the conductor cross section is too small, continuous heavy load operation will cause sharp temperature rise of wiring parts, accelerating insulation aging. All matched copper busbars and cables can be provided together with customized high voltage transformer products, which are tested to meet international current carrying standards and eliminate matching specification errors on construction site.
Contact resistance at wiring joints is the main source of heat generation during equipment operation. Untreated metal joints will oxidize rapidly under air and humidity erosion, continuously raising contact resistance and forming local high temperature hot spots. All connection points of high voltage transformer need tin plating or silver plating treatment before installation to isolate air and prevent metal oxidation. During on site construction, construction workers should wipe the contact surface clean and evenly apply conductive paste before fastening bolts, to further reduce contact resistance. After fastening, regular tightness inspection is required in subsequent maintenance cycles to avoid bolt loosening caused by long term equipment vibration, which will damage the anti oxidation coating and lose heat dissipation effect.
Two core safety protection components must be installed on the high voltage side of high voltage transformer before connecting distribution cabinets, including lightning arresters and disconnect switches. Lightning arresters can release instantaneous high voltage surge caused by thunderstorms to avoid lightning damage to transformer internal coils. Disconnect switches can cut off the power supply circuit completely during daily maintenance, creating full isolation safe space for inspection and repair work. The low voltage side busbars need to install complete insulating covers and mark clear three phase sequence signs to prevent accidental electric shock of maintenance personnel. After finishing all wiring work, professional testers must conduct insulation resistance detection and phase sequence verification to eliminate wrong wiring and insulation breakdown hidden dangers before putting high voltage transformer into official operation.
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