500kva Oil Immersed Outdoor High Voltage Transformer

This three-phase oil-immersed outdoor high-voltage transformer, rated at 500kVA, is designed to step down high voltages such as 10kV or 35kV to low voltage levels like 0.4kV, making it ideal for terminal distribution systems. The transformer features a core constructed from high-permeability cold-rolled grain-oriented silicon steel with a stepped lap joint design, effectively reducing hysteresis and eddy current losses. No-load loss values significantly outperform national standards.

Both high-voltage and low-voltage windings are made from oxygen-free copper conductors. The low-voltage winding adopts a foil-wound configuration with longitudinal oil ducts, substantially improving mechanical strength and short-circuit withstand capability. The fully sealed corrugated tank design provides excellent heat dissipation while automatically compensating for oil volume changes. This design prevents contact between the insulating oil and ambient air, eliminating oil oxidation and moisture ingress, thereby extending service life.

The oil-immersed transformer supports multiple tapping ranges (±5%, ±2×2.5%) to accommodate grid voltage fluctuations. Its compact, robust construction suits pole-mounted, platform, or ground-level outdoor installations, ensuring reliable performance across diverse climatic conditions.

Product Parameter (Specification)

Product Feature And Application

Key Features

High Energy Efficiency: Utilizes high-permeability silicon steel and an optimized core structure, reducing no-load loss by over 15% compared to conventional products, delivering measurable energy savings over the equipment's lifetime.

Fully Sealed Construction: Corrugated tank design eliminates the need for a conservator, preventing oil oxidation and moisture absorption, enabling maintenance-free operation.

Superior Weather Resistance: Operates reliably in ambient temperatures ranging from -25°C to +40°C and at altitudes up to 1000 meters. IP54 protection ensures resistance to dust and rain.

High Short-Circuit Withstand Capability: Windings are mechanically reinforced with a robust clamping system, having passed short-circuit impact tests to ensure safety during grid faults.

Flexible Installation: Compact dimensions support pole-mounted, platform, or ground-level installation, adapting to both urban and rural site constraints.

Main Application Scenarios

Urban Power Distribution Networks: Suitable for residential areas, commercial districts, and industrial parks where reliable terminal distribution is required.

Industrial Facilities: Provides stable low-voltage power to manufacturing plants, processing lines, and heavy machinery, handling fluctuating loads with ease.

Renewable Energy Projects: Widely used in photovoltaic and wind power generation systems for step-up or distribution applications, with strong adaptability to outdoor environments.

Infrastructure Construction: Deployed in airports, subway systems, hospitals, and data centers where high power supply reliability is critical.

Temporary and Emergency Power Supply: Compact and transportable design makes it ideal for temporary substations or emergency repair scenarios.

Production Details

Core Material and Manufacturing Process

The core is manufactured using high-permeability cold-rolled grain-oriented silicon steel with a 45° stepped lap joint design. Core laminations are precision-sheared and automatically stacked to ensure tight joints and uniform magnetic paths. The core is securely bound with semi-dry glass tape, minimizing vibration and noise while reducing no-load losses.

Winding Structure

Both high-voltage and low-voltage windings are wound using oxygen-free copper conductors, offering high electrical conductivity and low resistive losses. The low-voltage winding adopts a foil-wound configuration with uniform inter-layer insulation and longitudinal oil ducts, significantly enhancing mechanical strength and short-circuit withstand capability.

Insulation and Cooling System

High-quality mineral insulating oil serves as both a dielectric medium and coolant, providing excellent chemical stability and dielectric strength. The oil-paper insulation system undergoes strict vacuum drying and oil-filling processes to eliminate residual moisture and air bubbles, ensuring partial discharge inception voltage well above standard requirements.

Tank and Sealing Structure

The tank features a corrugated panel design that provides both heat dissipation and thermal expansion compensation, eliminating the need for an external conservator. The fully sealed structure prevents oil oxidation and moisture ingress, ensuring maintenance-free operation throughout the transformer's service life. A pressure relief valve and oil level gauge are provided as standard safety features.

Quality and Testing Assurance

Each oil immersed outdoor high voltage transformer undergoes comprehensive routine and type tests before delivery, including no-load loss and load loss measurements, 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.

Q&A: Key Product Insights

Q1: What is a 500kVA oil immersed outdoor high voltage transformer, and where is it used?

A: This transformer steps down high voltages such as 10kV or 35kV to low voltage levels like 0.4kV, with a capacity of 500kVA. It is widely used in urban distribution networks, industrial parks, renewable energy projects, and infrastructure applications where outdoor installation and long-term reliability are essential.

Q2: What makes this transformer energy efficient?

A: Energy efficiency is achieved through the use of high-permeability grain-oriented silicon steel and an optimized core joint design. These features reduce no-load loss by more than 15% compared to conventional products, leading to substantial electricity savings over the transformer's operating life.

Q3: What are the benefits of the fully sealed construction?

A: The fully sealed corrugated tank eliminates the need for a conservator and breather system. It prevents the insulating oil from contacting atmospheric air, avoiding oxidation and moisture absorption. This reduces maintenance requirements and extends the service life of both the oil and the transformer.

Q4: How does this transformer perform under short-circuit conditions?

A: The 500kVA oil immersed outdoor high voltage transformer is designed with a mechanically reinforced winding structure and a robust clamping system. It has successfully passed short-circuit impact tests at nationally recognized testing laboratories, ensuring reliable performance and safety during grid faults.

Q5: What warranty and after-sales support are provided?

A: We offer a 5-year warranty covering manufacturing defects under normal use. Lifetime technical support and spare parts availability are provided. In case of failure, we respond within one hour of notification and dispatch technical personnel within 24 hours domestically. The transformer is designed for a service life of no less than 30 years.

Why Choose Lugao Power?

Certification and Quality Assurance

ISO 9001:2008 Quality Management System Certified

CE Marked

Type Test Reports from National Transformer Quality Supervision and Testing Center

100% Routine Testing Before Delivery: no-load loss, load loss, short-circuit impedance, induced over-voltage, partial discharge, lightning impulse, and more

Packaging and Delivery

Packaging: Wooden crate or weather-resistant wrapped packaging suitable for sea, land, or rail transport

Shipping Condition: Oil-filled, sealed, accompanied by factory test reports, instruction manuals, and installation drawings

Standard Accessories: Oil level gauge, pressure relief valve, dial thermometer, bushings, grounding bolts, and complete hardware set

After-Sales Service Commitment

5-Year Warranty: Free repair or replacement for quality issues arising under normal use after commissioning.

Lifetime Service Support: Technical assistance and spare parts availability throughout the product lifecycle.

30-Year Design Life: Built with high-grade materials to ensure long-term reliability.

Emergency Response: Response within one hour of fault notification; domestic on-site service within 24 hours.