1500 kVA Oil-Immersed Distribution Transformer

1500 kVA Oil-Immersed Distribution Transformer is specified for 1500 kVA (1.5 MVA) oil-immersed distribution service. It uses 11kV / 20kV / 33kV primary voltage. It uses ONAN (Self Cooled) cooling. Engineering details address high-Capacity Passive Cooling Engineering, construction, application context, and electrical data for project selection.

High-Capacity Passive Cooling Engineering

For this 1500 kVA rating, high-capacity passive cooling engineering affects how the transformer is selected, protected, and operated in the field.

• Sits at the upper echelon of distribution capacities, delivering approximately 2165 Amps of low-voltage current.
• Despite this massive power throughput, this rating is engineered as a strictly oil immersed self cooled transformer.
• By optimizing the tank geometry and radiator surface area, we eliminate the need for external cooling fans (ONAF).
• This "passive cooling" approach offers two distinct engineering advantages: Zero Maintenance on Cooling Gear: There are no fan motors to fail, bearings to grease, or control circuits to troubleshoot.
• Silent Operation: Without the mechanical noise of air blowers, this rating maintains a lower acoustic profile, making it suitable for high-density urban zones or residential proximity installations.

Radiator & Thermal Design

The radiator and thermal design details below highlight design choices that matter during continuous distribution service.

• To achieve effective heat dissipation in a oil immersed self cooled transformer of this size, standard corrugated walls are often insufficient.
• Instead, the design uses Detachable Pressed Steel Radiators.
• Surface Area Logic: These radiator banks provide a significantly larger cooling surface area compared to integrated fins.
• They are designed to create a strong "thermosiphon" effect, accelerating the natural circulation of oil solely through convection currents.
• Hot Spot Control: The internal winding ducts are computer-modeled to ensure oil reaches the core's deepest layers, keeping the winding gradient temperature rise strictly within the 65K limit (IEC 60076).

Mechanical Clamping & Short Circuit Strength

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

• Handling over 2000 Amps means the electromagnetic forces during a fault are extreme.
• Core Construction: the design uses a rigid clamping structure with non-magnetic steel flitch plates.
• This prevents the core sheets from vibrating (reducing noise) and holds the coils firmly in place.
• Winding Stability: The LV winding is constructed using copper foil or continuously transposed conductors (CTC) to maximize space factor and mechanical strength against radial stress.

Installation Context: The "Max Size" for CSS

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

• The 1500 kVA unit is widely recognized in the industry as the maximum standard capacity that fits comfortably inside a prefabricated Compact Secondary Substation (CSS) or Kiosk.
• Space Optimization: Because it relies on radiator banks rather than bulky fan assemblies, it fits within standard CSS enclosure dimensions.
• Connection: The LV terminals are almost exclusively fitted with 4000A-rated busbar palms to accommodate heavy copper busbar bridging, as cabling is impractical at 2165 Amps.

Electrical and Mechanical Data

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

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