Customization Oil-immersed Three-Phase Transformer for Transmission Substation

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Key attributes

Brand	ROCKWILL
Model NO.	Customization Oil-immersed Three-Phase Transformer for Transmission Substation
Rated capacity	120000kVA
Primary voltage	242kV
Secondary voltage	6.3kV
Methods of regulation	N/A
Winding type	Three Winding
Series	SFS(Z)

Description

This three-phase oil-immersed power transformer is designed for 220–245kV class high-voltage transmission substations, industrial power systems, and renewable energy grid connection. The core-type construction with grain-oriented silicon steel reduces no-load losses.

On-load tap-changing (OLTC) enables voltage regulation under load for stable grid operation. Manufactured and tested per IEC 60076-1, IEEE C57.12.00, ANSI C57.12.90, and AS/NZS 60076.5. Suitable for thermal power plants, large industrial bases, urban substations, and wind-solar renewable energy integration.

Feature

On-load tap-changing (OLTC):Voltage regulation under load for grid stability
Core-type low-loss design:CRGO silicon steel core minimizes losses and noise
IEC/IEEE certified quality:Full compliance with applicable international standards
Sealed-tank construction:Prevents oil oxidation for extended service life
Optimized thermal management:Axial oil duct design for reliable high-load operation

Parameters

Rated capacity	240 MVA
Primary voltage	230 kV
Secondary voltage	6.3 kV
Regulation method	On-load tap-changing (OLTC)
Winding type	Double winding
Vector group	YNd11
Impedance voltage	≥12.5%
Tap range	±8×1.25%
Cooling method	ONAF
Insulation level Um	245 kV
LI / AC withstand	950 kV / 395 kV
Frequency	50/60 Hz

Environmental Conditions

Maximum ambient temperature: +40°C
Daily average ambient temperature: ≤ +30°C
Minimum ambient temperature: -25°C
Altitude: ≤ 1000 m
Solar radiation: Per site conditions
Pollution level: Normal

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