Single Phase Oil Immersed Power Distribution Transformer1250kVA/20kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	Single Phase Oil Immersed Power Distribution Transformer1250kVA/20kV
Rated voltage	20kV
Rated frequency	50/60Hz
Rated capacity	1250kVA
Series	D

Description

The Rockwill single-phase oil-immersed distribution transformer is engineered to deliver reliable power conversion for utility, commercial, and residential applications. Combining robust construction with advanced electrical design, it ensures stable voltage regulation and efficient energy distribution. Available in both pole-mounted and pad-mounted configurations.

Key Features

Oil-immersed construction： Mineral oil provides insulation and cooling for dependable outdoor operation with minimal maintenance
Single-phase design： Compact core and coil assembly reduces weight and installation footprint compared to three-phase equivalents
Flexible mounting： Configurable for pole-mount or pad-mount installation to suit diverse distribution network layouts
Stable voltage regulation： Off-circuit tap changer allows field adjustment to match local line conditions
Robust enclosure： Fully sealed, weatherproof tank prevents oil leakage and moisture ingress

Technical Parameters

Parameter	Value
Phase	Single-phase
Rated capacity	1250 kVA
Frequency	50 / 60 Hz
Primary voltage	20 kV
Secondary voltage	As specified
Insulation level (IEC)	24 / 50 / 125 kV (Um / PF / LI)
Tapping range	±2 × 2.5 % (off-circuit)
Winding material	Copper / Aluminum (optional)
Cooling method	ONAN (Oil Natural Air Natural)
Insulation medium	Mineral oil
Standards	IEC 60076, ANSI / IEEE (as specified)

Applications

Single-phase distribution in utility power networks
Commercial and industrial facilities requiring single-phase supply
Rural and suburban power distribution
Step-down transformation for residential communities

Custom voltage ratings, tapping arrangements, impedance values, and mounting configurations are available on request. Contact Rockwill for application-specific design and quotation.

Documentation Resource Library Distribution Transformer

Public.

Rockwill Electric Group Profile

Brochure

English

PDF

Negotiable

Pricing calculator

Model

D-20/1250

PDF

Rockwill Electric Group Profile

Warranty by

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