SZ11-200–2500/10 Series Three-Phase, Dual-Winding, Oil-Immersed On-Load Tap-Changing Distribution Transformers

1. Product Introduction

The SZ11-200–2500/10 series consists of 10 kV three-phase, double-winding, oil-immersed on-load tap-changing distribution transformers. As a high-performance oil-immersed transformer, the “S” in the model denotes three-phase, ‘Z’ denotes on-load tap-changing, and “11” represents the performance level code. The rated capacity ranges from 200 to 2500 kVA. It is designed to meet the voltage stabilization and efficient power distribution needs of power grids, industrial and mining facilities, and infrastructure projects. It offers key advantages such as safety, low losses, low operating costs, and maintenance-free operation, making it a core piece of equipment for power systems and industrial power supply and distribution.

2. Core Advantages and Technical Highlights

①Low losses, low operating costs, and outstanding energy-saving benefits

As a high-quality oil-immersed transformer, this product features a fully staggered-step core with high-permeability cold-rolled silicon steel sheets, which optimizes the magnetic circuit distribution. No-load losses are reduced by approximately 20% compared to traditional oil-immersed transformers, with a corresponding decrease in no-load current; The high-voltage windings use oxygen-free copper electromagnetic wire, which features low resistivity and excellent conductivity. Combined with a new core insulation structure, this reduces load losses by over 10%, significantly lowering long-term energy consumption and delivering the core advantage of low operating costs. Long-term use can result in substantial savings on electricity bills.

②Precise Voltage Regulation, Safe and Stable Operation, Suitable for Complex Conditions

As an oil-immersed transformer, this product features comprehensive safety upgrades. It is equipped with a 9-tap on-load tap changer, with a high-voltage tap range covering ±3×2.5% (suitable for 10kV grid fluctuation scenarios). Voltage can be adjusted manually, electrically, or automatically under load, ensuring the output voltage remains stable within the qualified range. This prevents equipment failures caused by voltage fluctuations, comprehensively safeguarding electrical safety, and perfectly addressing various scenarios with significant voltage fluctuations and frequent load changes.

③ Maintenance-Free Design, High Reliability, and Hassle-Free Operation

This oil-immersed transformer features a fully sealed corrugated tank design that completely isolates the insulating oil from the air, eliminating leakage and effectively extending the equipment’s service life. This achieves the core feature of maintenance-free operation, significantly reducing operational labor and material costs; The core employs a plate-pulling structure combined with end-face adhesive curing of silicon steel sheets, forming an integrated rigid structure. Coupled with high-strength clamps and support beams, this significantly enhances short-circuit resistance. The body and tank are supported by laminated wood, providing strong resistance to impact during both transportation and operation. Installation and commissioning can be performed without lifting the core for maintenance, further reinforcing the maintenance-free advantage while ensuring long-term safe and stable operation of the equipment.

④Compliant and Safe, Suitable for Multiple Scenarios, Outstanding Value for Money

This product fully complies with all relevant standards and is suitable for both indoor and outdoor installation. It features low noise and stable heat dissipation. As a low-loss, low-operating-cost, maintenance-free oil-immersed transformer, it is suitable for a wide range of applications and offers outstanding value for money.

3. Technical Specifications

4. Applications

As a low-loss, low-operating-cost, safe, and maintenance-free oil-immersed transformer, this product is widely applicable in the following areas:

Power Grid Infrastructure: Urban distribution networks, rural grid upgrades, and power supply for small and medium-sized substations;

Industrial Power Supply: Power distribution for industrial and mining enterprises, factory workshops, metallurgy, petrochemicals, and other sectors;

Infrastructure: Power supply for railways, ports, tunnels, mines, and communication base stations;

Civil Applications: Power distribution for large residential complexes, business centers, schools, hospitals, and other public buildings.

5. Product Services and After-Sales Support

We support customized parameter adjustments (such as special voltage combinations and upgraded protection ratings) and provide end-to-end technical support (including product selection consultation, installation guidance, and operation and maintenance training); Strict pre-delivery factory testing (including withstand voltage, loss, and turns ratio) ensures that oil-immersed transformers meet safety standards and deliver core advantages such as low losses, low operating costs, and maintenance-free operation. The products are tailored for overseas export scenarios (including support for customs clearance, Proforma Invoices, and other foreign trade services).