S11 Compact Substation Electrical Oil Immersed Transformer

Our company’s S11 Compact Substation Electrical Oil Immersed Transformer is a highly efficient and energy-saving solution designed specifically for modern power distribution networks. Purchasing this product provides you with an integrated unit combining a transformer, high-voltage switchgear, and low-voltage distribution equipment, significantly saving installation space and construction costs.

This product uses a low-loss silicon steel core and high-conductivity copper windings, resulting in significantly lower no-load losses than national standards, leading to substantial reductions in energy consumption over long-term operation. The oil-immersed cooling system ensures excellent heat dissipation, maintaining stable operation even under high-temperature and high-load conditions. Its compact modular structure facilitates transportation and installation and enhances on-site maintenance safety.

Product Feature And Application

Features

1. Meet or exceeds ANSI.IEC.GB.SANS.Standards

2. Safe Handling, Installation and Operation.

3. Attractive, modern appearance

4. Reasonable Structure

5. Fully-sealed

6. Higher system reliability

7. High security and reliability in operation

8. High capacity of overload and efficiency

9. Robust construction having excellent short circuit and thermal withstand capabilities

10. Transformers are more efficient by Reduced no-load losses and Reduced load losses

The S11 Compact Substation Electrical Oil Immersed Transformer compact substation electrical oil immersed transformer features four core advantages:

High Efficiency & Energy Saving : utilizing low-loss silicon steel and an optimized core structure, both no-load loss and load loss are significantly lower than those of traditional products, aligning with national energy-saving guidelines and substantially reducing operating costs over long-term operation.

Superior Heat Dissipation & Overload Capacity : as an oil immersed transformer, it uses high-performance insulating oil as the cooling and insulating medium, offering high heat dissipation efficiency and maintaining stable operation even under high temperature, heavy load, or harsh conditions, effectively extending the equipment's service life.

Compact Structure Design : The S11 Compact Substation Electrical Oil Immersed Transformers are custom-engineered for compact substations, featuring a small footprint and a compact structure that facilitates easy installation and maintenance. They are particularly well-suited for indoor or outdoor power distribution sites where space is at a premium.

High Reliability & Safety : the fully sealed structure effectively prevents oil oxidation and moisture ingress, providing excellent insulation performance and short-circuit withstand capability, ensuring long-term safe and stable operation under complex grid conditions.

Application

Transformer normal service conditions

1. The height above the sea level is below 1000m;

2. Ambient temperature;

3. Highest air temperature +40°C;

4. Highest daily average air temperature+30°C;

5. Highest annual average air temperature +20°C;

6. Lowest outdoor air temperature -25°C;

Main Application Scenarios

Urban Power Distribution Networks: Suitable for compact substations in residential areas, commercial areas, and industrial parks, meeting high-density power demand.

New Energy Projects: S11 Compact Substation Electrical Oil Immersed Transformers are widely utilized in the step-up or distribution stages of photovoltaic and wind power generation systems, capable of withstanding harsh outdoor environments.

Infrastructure Construction: Suitable for locations with high power supply reliability requirements, such as airports, subways, hospitals, and data centers.

Temporary and Emergency Power Supply: Compact structure, easy to transport, suitable for temporary substations or emergency repair scenarios.

Product Parameter (Specification)

S11 VS S13 Transformer Comparison

Selecting the right distribution transformer depends on your project's energy efficiency targets, budget, and long-term operating costs. Both S11 and S13 oil immersed transformers are widely used in power distribution systems, but they are designed for different performance priorities.

Production Details

Core Material and Process

The S11 Compact Substation Electrical Oil Immersed Transformers core is constructed using high-permeability cold-rolled grain-oriented silicon steel. The core lamination are precision-sheared and automatically stacked to ensure tight joints and uniform magnetic paths, fundamentally minimizing no-load current and stray losses.

Winding Structure

Both high-voltage and low-voltage windings use oxygen-free copper conductors for high electrical conductivity and low resistive losses. Moreover, low-voltage windings adopt a foil-winding configuration with uniform inter-layer insulation, which significantly enhances short-circuit withstand capability.

Insulation System

High-quality mineral insulating oil or optionally, environmentally friendly high-fire-point insulating fluid, is used to provide excellent dielectric strength and chemical stability. The oil-paper insulation system undergoes rigorous vacuum drying and oil-filling processes to ensure no residual air bubbles remain, achieving a partial discharge inception voltage well above standard requirements, thereby ensuring long-term operational reliability.

Structural Design Details

Tank and Sealing Structure

The tank incorporates a corrugated panel or integrated fin-type radiator design, meeting cooling requirements while providing elastic flexibility to automatically accommodate oil volume fluctuations. The fully sealed structure is equipped with a pressure relief valve and an oil level indicator, preventing contact between the oil and ambient air, thereby avoiding oxidation and moisture absorption, and extending oil replacement intervals.

Compact Integrated Design

Optimized for compact substation applications, the S11 Compact Substation Electrical Oil Immersed Transformers enables pre-installed integration with high-voltage switchgear and low-voltage distribution panels. External dimensions are precisely calculated to minimize footprint while meeting electrical clearance and insulation distance requirements. Lifting lugs, base mounting holes, and cable entry methods are standardized to facilitate rapid on-site installation and connection.

Protection and Control Configuration

Temperature Monitoring and Protection

An oil temperature gauge and winding temperature indicator are provided as standard, enabling real-time temperature monitoring and offering configurable alarm and trip contacts. For high-capacity transformers, an optional fiber-optic temperature measurement system allows precise monitoring of winding hotpots temperatures, providing data support for dynamic load management.

Pressure and Oil Level Protection

A pressure relief valve is installed to automatically release pressure in the event of abnormal internal tank pressure, preventing deformation or rupture. The oil level gauge features a low-oil-level alarm function, enabling timely maintenance intervention or leak detection.

Quality and Testing Assurance

Each transformer undergoes comprehensive type tests and routine tests prior to delivery, including no-load loss and load loss tests, short-circuit impedance tests, induced over-voltage withstand tests, partial discharge tests, and lightning impulse tests. All key performance indicators exceed the requirements of both national standards and IEC specifications, ensuring long-term stable operation under complex field conditions.

Why Choose Lugao Power?

With advanced manufacturing capabilities and a rigorous quality management system, Lugao Power provides reliable power distribution equipment solutions to customers worldwide.

Specialized Manufacturer — Lugao has over 10 years of experience in the power transmission and distribution equipment sector, specializing in the design and manufacture of oil-immersed transformers, dry-type transformers, prefabricated substations, and medium- and high-voltage switchgear.

Strict Quality Control — Every S11 series oil-immersed transformer undergoes comprehensive routine testing before leaving the factory, including no-load and load loss tests, insulation resistance tests, winding resistance measurements, dielectric withstand voltage tests, and factory acceptance inspections, to ensure reliability during on-site operation.

Customized Engineering Solutions — We offer customization services for voltage ratings, capacity, connection groups, cooling methods, enclosure designs, and installation configurations to meet the needs of various sectors, including utilities, industry, renewable energy, and infrastructure projects.

Energy-Efficient Design — Our transformers are manufactured using high-quality cold-rolled grain-oriented silicon steel sheets and high-conductivity copper windings, designed to reduce energy consumption, improve operational efficiency, and lower the total cost of ownership over the entire lifecycle.

Compliance with International Standards —— Our products are manufactured under an ISO-certified quality management system and comply with IEC, GB, and other relevant international standards. Type test reports and technical documentation are available upon request.

Reliable Global Supply —— Backed by an experienced engineering and export team, Lugao provides global customers with technical consulting, prompt quotations, flexible OEM/ODM services, secure packaging, and responsive after-sales support.

Product after-sales service

1. After the transformer is installed and put into operation on-site, it is guaranteed to be leak-free, and the paint is guaranteed not to peel or fade. A 5-year warranty is provided; any quality problems occurring under normal use within the warranty period will be covered by the warranty.

2. All S11 Compact Substation Electrical Oil Immersed Transformers are covered by lifetime service, ensuring the completeness of product accessories.

3. Service life is no less than 30 years.

4. In the event of equipment failure, the supplier will respond within one hour of receiving notification from the buyer, and dispatch technical personnel to the site within 24 hours domestically.

Service Commitment

1. The S11 Compact Substation Electrical Oil Immersed Transformer is manufactured in strict accordance with the requirements of the ISO 9001-2008 Quality Management System, ensuring that the product meets 100% quality standards prior to leaving the factory.

2. Our company provides comprehensive pre-sales, sales, and after-sales service to ensure customer satisfaction.

2. Our company offers a 60-month warranty. In the event of any quality issues, we will repair or replace the product free of charge, ensuring 100% customer satisfaction.

The design and testing of transformers shall comply with the following standards:

GB1094.1~2-1996, GB1094.3-2003, GB1094.5-2008 《Power Transformers》

GB/T6451-2015 《Specification and Technical Requirements for Oil-Immersed Power Transformers》

JB/T3837-2010 《Method of Compiling Type Designations for Transformer Products》

GB/T311.1-3.11-97 《Insulation Coordination and High Voltage Testing Techniques for High Voltage Transmission and Transformation Equipment》

GB10237-88 《Insulation Levels and Dielectric Tests for Power Transformers—External Insulation Air Clearances》

GB7595-87 《Quality Standard for Transformer Oil in Service》

GB7328-87 《Measurement of Sound Level for Transformers》

GB7534-87 《Measurement of Partial Discharge》

GB/T15164-94 《Loading Guide for Oil-Immersed Power Transformers》

DL/T586-95 《Technical Guide for Manufacturing Supervision of Power Equipment Users》

GB/T311.1-3.11-97 《Insulation Coordination and High Voltage Testing Techniques for High Voltage Transmission and Transformation Equipment》

GB2536-1990 《Transformer Oil》

JB/T56011-92 《Product Quality Classification for Oil-Immersed Power Transformers》

ZBK41005-89 《Sound Level of 6-220KV Transformers》