S20-200kVA 10.5kV/0.4kV Three Phase Oil Immersed Distribution Transformer Dyn11 with Copper Windings and C3 Corrosion Protection

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S20-200kVA 10.5kV/0.4kV Three Phase Oil Immersed Distribution Transformer Dyn11 with Copper Windings and C3 Corrosion Protection

S20-200kVA 10.5kV/0.4kV Three Phase Oil Immersed Distribution Transformer Dyn11 with Copper Windings and C3 Corrosion Protection

Name: S20-200kVA 10.5kV/0.4kV Three Phase Oil Immersed Distribution Transformer Dyn11 with Copper Windings and C3 Corrosion Protection
Brand: YAWEI

The YAWEI S20-200kVA is a three-phase oil-immersed distribution transformer designed for medium-voltage power distribution systems. With a rated capacity of 200kVA, a primary voltage of 10.5kV, and a secondary voltage of 0.4kV, it provides step-down power conversion for industrial facilities, commercial buildings, and electrical distribution networks.

This S20 series transformer features 100% copper windings, a Dyn11 vector group, a specified impedance voltage of 4%, and adjustable primary voltage taps of ±2 × 2.5%. Its oil-immersed insulation and cooling design supports dependable operation when the transformer is correctly selected, installed, and maintained according to the specified service conditions.

C3 corrosion protection is specified for projects requiring protection against atmospheric corrosion in suitable environments. The final coating system and surface preparation requirements should be confirmed against the applicable project specification.

The YAWEI S20-200kVA can be considered for new distribution installations, equipment replacement, and electrical infrastructure upgrades. Technical configuration, guaranteed losses, insulation requirements, and nameplate details are subject to engineering confirmation to ensure compliance with the customer's requirements and applicable standards.

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Model:
S20-200-10.5/0.4
Brand:
YAWEI

S20-200kVA transformer 200kVA oil immersed transformer 200kVA distribution transformer

PRODUCT CATEGORY

>> Product Introduction

>> Technical Parameters

>> Product Uses

>> Product Operation Guide

Product Introduction

Designed for Medium-Voltage Distribution Systems

The S20-200kVA transformer is designed to convert 10.5kV medium-voltage electricity to 400V low-voltage power. Its 200kVA rated capacity and Dyn11 connection provide defined electrical characteristics for system planning and equipment selection. The ±2 × 2.5% primary voltage taps allow voltage adjustment according to the approved design. Before ordering, the buyer should verify the supply voltage, load profile, grounding arrangement, and required connection group.

Copper Winding Configuration

The S20-200kVA is specified with 100% copper windings for both winding systems. Transformer oil provides electrical insulation and transfers heat away from the active components. The specified 4% impedance voltage is an important design parameter affecting voltage regulation and short-circuit current calculations. Guaranteed no-load losses, load losses, temperature rise, and insulation levels should be established in the approved technical specification rather than assumed from the model designation alone.

Protective Coating for Specified Environments

C3 corrosion protection is specified for the transformer project to address atmospheric corrosion under the applicable environmental conditions. The actual protection performance depends on surface preparation, coating materials, film thickness, application quality, and maintenance. The coating system should be selected and documented against the agreed corrosion-protection requirements. For coastal, marine, or highly corrosive industrial locations, the required corrosion category should be reviewed before the coating specification is finalized.

Specification-Based Manufacturing and Inspection

Each transformer should be manufactured and inspected against the approved technical specification and applicable standards. Project documentation may include the nameplate data, routine test reports, installation instructions, and relevant accessory information, as required by the contract. For this S20 project, the specified negative deviation in losses and the separate nameplate requirement must be clarified before production. Guaranteed performance values should be verified through the approved design and test documentation.

>> Technical Parameters

Type	Three Phase Oil-immersed Distribution Transformer
Model	S20-200kVA
Installation	Outdoor
Altitude	≤1000m
Rated Power	200KVA
Cooling Method	ONAN
Primary Voltage	10.5KV
Secondary Voltage	400V or others
Rated Frequence	50/60HZ
Insulation oil	Mineral oil
Tapping Range	±2×2.5%/±5%
Temperature rise℃)	65
Connection Group	Dyn11
Total weight(kg)	-

1. Industrial Power Distribution

The S20-200kVA transformer can supply low-voltage power to compatible industrial loads, workshops, and manufacturing facilities connected to a 10.5kV distribution system.

2. Commercial Buildings

Suitable for selected commercial properties, office buildings, and retail facilities requiring a dedicated medium-voltage to low-voltage transformer.

3. Distribution Network Upgrades

Can be considered for replacing existing distribution transformers or expanding local electrical capacity, provided the rated load and protection requirements are satisfied.

4. Infrastructure Projects

Applicable to selected public infrastructure and utility distribution projects requiring a 200kVA, 10.5kV/0.4kV transformer.

5. Facilities Requiring Corrosion Protection

The specified C3 coating system can be considered for environments within the applicable corrosion category. The suitability of the coating should be checked against the actual site conditions and project requirements.

Installation, Operation and Maintenance Guide

Transportation and Handling
Delivery Inspection
Storage Requirements
Installation Environment and Foundation
Electrical Connection and Grounding
Inspection of Bushings and Accessories
Pre-Energization Inspection
Insulation Resistance Testing
Winding Resistance Testing
Turns Ratio and Vector Group Verification
Transformer Oil Inspection
Protective Device Verification
Initial Energization
Operating Condition Monitoring
Routine Maintenance
Corrosion Coating Inspection
Troubleshooting and Fault Handling
Maintenance Records and Safety Procedures

All installation, testing, and maintenance work should be performed by qualified personnel in accordance with the manufacturer's instructions and applicable electrical safety regulations.