Step Up Three Phase Medium Voltage Electric Transformer

Our step up three phase medium voltage electric transformer is designed to convert low-voltage power (such as 0.4kV) into medium-voltage output (such as 11kV, 22kV, or 33kV), enabling efficient transmission over long distances or integration into distribution networks. This product is essential for renewable energy projects, industrial facilities, and power stations requiring reliable voltage elevation.

The transformer features a high-permeability grain-oriented silicon steel core and oxygen-free copper windings, ensuring minimal losses and high thermal stability. The oil-immersed cooling system provides superior heat dissipation, while the fully sealed structure protects against environmental contaminants, reducing maintenance needs and extending service life.

Product Parameter (Specification)

Step Up Three Phase Oil-Immersed Transformer-Typical Specifications (0.4kV / 11kV)

Standard Equipment Includes

1. Oil level gauge with low-level alarm

2. Pressure relief valve

3. Dial thermometer with alarm contacts

4. Optional gas relay for fault detection

Product Feature And Application

Features

step up three phase medium voltage electric transformers meets or exceeds international standards--Compliant with IEC 60076, ANSI C57.12, GB1094, and SANS 780, ensuring global applicability and reliability.

Fully sealed corrugated tank design--Eliminates the need for a conservator, prevents oil oxidation and moisture ingress, enabling maintenance-free operation over extended periods.

High overload capacity & thermal stability--Oil-immersed cooling system ensures stable performance even under sustained high-load conditions or fluctuating input voltages.

Low noise operation--Optimized core joint structure and vibration-damping design reduce operational noise, suitable for residential or noise-sensitive environments.

Compact structure for flexible installation--Modular design allows for pole-mounted, pad-mounted, or substation configurations, adapting to space-constrained or outdoor sites.

Robust short-circuit withstand capability--Foil-type low-voltage windings and rigid coil support structures ensure mechanical integrity under sudden fault conditions.

Easy installation & low maintenance--Standardized lifting lugs, base mounting holes, and cable entry options simplify on-site installation; fully sealed design minimizes routine maintenance.

Long service life with lifetime support--Designed for a minimum 30-year operational life, backed by lifetime technical support and spare parts availability.

Multiple tapping ranges for voltage regulation--Provides ±5%, ±2×2.5% tapping options, allowing precise voltage adjustment to meet grid or load variations.

Environmentally friendly insulating fluid options--Available with natural ester (vegetable oil) or high-fire-point insulating fluids for eco-conscious applications.

Q&A: Key Step Up Transformer Insights

Q: What is a Step Up transformer?

A: A step up transformer increases low input voltage to a higher output voltage. It has fewer turns on the primary winding and more turns on the secondary winding. This type of transformer is critical for renewable energy systems, such as solar farms and wind power plants, where generated low-voltage power must be stepped up for grid transmission.

Q: How does this step up transformer improve energy efficiency?

A: Our transformer uses high-permeability cold-rolled grain-oriented silicon steel with a stepped lap joint core design. This significantly reduces hysteresis and eddy current losses, lowering no-load and load losses compared to conventional transformers, which directly reduces operational costs.

Q: Why is the oil-immersed cooling system important for step up applications?

A: The insulating oil provides both dielectric strength and efficient heat dissipation. It transfers heat from the core and windings to the tank surface, ensuring stable operation even under continuous high-load or high-temperature conditions typical in step up applications.

Q: Can thisstep up three phase medium voltage electric transformer be used outdoors?

A: Yes. The fully sealed corrugated tank design protects internal components from moisture, dust, and corrosive environments, making it ideal for outdoor installations such as solar power plants, wind farms, and industrial substations.

Advantages of the Features

Significantly Reduced Operating Costs: The optimized magnetic circuit and low-loss materials reduce energy losses, lowering electricity costs over the transformer’s lifetime.

High Operational Reliability: Advanced short-circuit withstand design and improved insulation systems ensure stable operation even under grid fluctuations or fault conditions.

Low Maintenance Requirements: The fully sealed structure eliminates the need for oil replacement and reduces inspection frequency, minimizing downtime and maintenance expenses.

Compact and Adaptable Design: The modular structure allows flexible installation in space-constrained environments, while standardized interfaces simplify integration with switchgear and control systems.

Products Adapt to the Environment

Application Scenarios

Renewable Energy Systems: Ideal for solar farms and wind power plants to step up generated low-voltage power to medium-voltage levels for grid connection.

Industrial Facilities: Used in manufacturing plants and heavy industries where low-voltage power from generators or inverters must be elevated for distribution.

Infrastructure Projects: Suitable for airports, railways, and data centers requiring reliable voltage elevation for backup or main power systems.

Power Stations: Applied in small-scale power generation stations where voltage must be increased for transmission over long distances.

Production Details

Core Material and Process

The step up transformers core is constructed using high-permeability cold-rolled grain-oriented silicon steel with a stepped lap joint design. The core is precision-cut and automatically stacked to ensure uniform magnetic flux distribution, minimizing no-load losses and magnetizing current.

Winding Structure

Both high-voltage and low-voltage windings are wound with oxygen-free copper conductors. Low-voltage windings utilize a foil or helical structure with longitudinal oil ducts, enhancing mechanical strength and short-circuit withstand capability.

Insulation and Cooling System

High-quality mineral oil or environmentally friendly high-fire-point insulating fluid is used. The oil-paper insulation system undergoes vacuum drying and oil-filling processes to eliminate residual moisture and air, ensuring high dielectric strength and long-term reliability.

Tank and Sealing

The corrugated tank design provides thermal expansion compensation without the need for a conservator. The fully sealed structure prevents oil oxidation and moisture ingress, reducing maintenance frequency and extending oil life.

Q&A: Production and Quality Assurance

Q: How do you ensure the step Up Three Phase Oil-Immersed Transformer short-circuit withstand capability?

A: Our transformers undergo short-circuit testing in nationally recognized laboratories. The combination of foil windings, rigid coil supports, and self-locking fasteners ensures the structure remains intact under sudden fault conditions.

Q: What quality standards do you follow?

A: All products are designed, manufactured, and tested in accordance with IEC 60076, GB1094, and ISO 9001:2015 standards. Each unit undergoes comprehensive routine and type tests before delivery.

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》