6000 kVA Oil-Immersed Distribution Transformer

6000 kVA Oil-Immersed Distribution Transformer is specified for 6000 kVA (ONAF) / 4800 kVA (ONAN) oil-immersed distribution service. It steps 33 kV / 35 kV networks to 6.6 kV / 11 kV loads. It uses ONAN / ONAF (Automated Fan Control) cooling. Engineering details address capacity Flexibility and Peak Management, construction, application context, and electrical data for project selection.

Capacity Flexibility and Peak Management

For this 6000 kVA rating, capacity flexibility and peak management affects how the transformer is selected, protected, and operated in the field.

• It typically functions as the primary feeder for district substations or large manufacturing plants.
• Unlike smaller distribution units, this equipment is often specified with a dynamic thermal rating to match fluctuating demand curves.
• Classified as a medium-sized oil immersed power transformer, it is engineered to operate efficiently under two distinct regimes.
• It handles continuous base loads (approx.
• 4500-4800 kVA) using natural convection (ONAN).

Logistics-Ready Tank Design

The logistics-ready tank design details below highlight design choices that matter during continuous distribution service.

• At 6 MVA, the physical footprint of the transformer becomes a logistical challenge.
• A key structural feature of this rating is the use of Detachable Panel Radiators.
• Transport Logic: To comply with road transport width restrictions, the radiator banks are bolted onto the main tank via butterfly valves.
• They are shipped separately and assembled on-site.
• Maintenance: This modular design allows maintenance teams to isolate and remove a single damaged radiator bank for repair without draining the entire main tank or decommissioning the oil immersed power transformer.

Core Assembly & Noise Control

These core assembly and noise control points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• A 6000 kVA unit involves a massive magnetic core, which can generate significant structure-borne noise (100Hz hum).
• To mitigate this-especially for installations near residential zones-The design uses Step-Lap Core Stacking.
• Flux Density Management: By optimizing the working flux density (typically kept below 1.7 Tesla) and using high-grade Hi-B silicon steel, we keep the magnetostriction vibration to a minimum.
• Clamping: The core is secured with fiberglass-reinforced bands rather than steel bolts to eliminate flux leakage paths and reduce the operational sound level to <65 dB.

Typical Application Context

Application guidance links the transformer rating with the substations, industrial loads, and site conditions where it is normally used.

• Urban Substations: Receiving 33kV transmission and stepping down to 11kV for local neighborhood distribution rings.
• Industrial Expansion: Ideal for factories expanding their production lines where the load has grown beyond the standard 2500/3150 kVA limit.
• Backup Power: Serving as the grid-tie transformer for 5-6 MW diesel generator power plants.
• 6000 kVA oil immersed transformer installed in an urban city substation.

Electrical and Mechanical Data

The electrical data summarizes the main values needed for project comparison and project comparison.

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