5000 kVA Oil-Immersed Distribution Transformer

5000 kVA Oil-Immersed Distribution Transformer is specified for 5000 kVA (5 MVA) oil-immersed distribution service. It steps 33kV / 35kV networks to 6.6kV / 11kV (Typical) or 400V loads. It uses ONAN / ONAF cooling. Engineering details address the Master Node of Distribution Networks, construction, application context, and electrical data for project selection.

The Master Node of Distribution Networks

For this 5000 kVA rating, the master node of distribution networks affects how the transformer is selected, protected, and operated in the field.

• Serves as the primary power supply for large-scale industrial parks, hospitals, and district substations.
• At this capacity, the unit bridges the gap between high-voltage transmission and local distribution, acting as the "Master" unit that feeds multiple downstream transformers.
• While functionally categorized as a large oil immersed distribution transformer, its engineering aligns more closely with power transformer standards.
• It is designed to handle complex load profiles where voltage stability is critical.

Active Voltage Stabilization (OLTC)

The active voltage stabilization (OLTC) details below highlight design choices that matter during continuous distribution service.

• At 5 MVA, a simple fixed tap setting is rarely sufficient to handle daily grid fluctuations.
• Instead of standard off-circuit taps, this rating is engineered with a robust On-Load Tap Changer (OLTC).
• This mechanism allows the transformer to physically shift tap positions under full load conditions without interrupting the power supply.
• When connected to an external regulation panel (AVR), the transformer actively counters voltage sags caused by peak industrial shifts.
• It dynamically adjusts the ratio (typically across a ±10% range) to ensure the secondary voltage remains rock-steady, protecting sensitive downstream equipment from undervoltage trips.

Differential Protection Readiness

These differential protection readiness points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• Protecting a high-capital asset like a 5 MVA transformer requires fault detection speeds faster than what standard fuses or breakers can offer.
• We design the tank to accommodate turret-mounted Current Transformers (CTs) directly inside the HV and LV bushing turrets.
• This configuration is essential for implementing Differential Protection Schemes.
• By monitoring the current balance between input and output, the system can identify and isolate microscopic internal winding faults (such as turn-to-turn shorts) in milliseconds-long before they escalate into catastrophic tank failures.

Installation & Application Context

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

• Mining Heavy Equipment: Powering large draglines or crushers where the starting voltage drop must be actively compensated by the OLTC.
• District Electrification: Acting as the zonal feeder for a residential township, supplying roughly 3,000 to 4,000 homes.
• 5000 kVA oil immersed transformer installed in an outdoor industrial main substation.

Electrical and Mechanical Data

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

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