1250kva 1600kva 20kv 400v Oil Immersed Transformer

1250kva 1600kva 20kv 400v Oil Immersed Transformer

1. Product Description

The 1250kVA 1600kVA 20kV 400V oil immersed transformer is a high-capacity three-phase medium-voltage step-down distribution transformer engineered for modern 20kV urban and industrial power grid systems. As a mainstream S11/S13 energy-saving oil-filled power transformer, this 20kV to 400V oil immersed power equipment serves as critical grid transformation infrastructure for large-scale power consumption scenarios. It reliably steps down 20kV medium high-voltage grid power to standard 400V low-voltage output, fully matching the operational voltage requirements of commercial buildings, large industrial production lines and municipal power facilities.

Manufactured in full compliance with IEC60076 and GB/T6451 industry standards, the 1250kVA and 1600kVA 20kV 400V oil immersed distribution transformer adopts high-grade grain-oriented silicon steel core and pure copper winding technology. Equipped with fully sealed corrugated oil tank and ONAN natural oil cooling system, this medium-voltage oil immersed transformer effectively cuts down no-load loss and operational heat generation compared with traditional transformer models. Designed for heavy-load continuous operation, it features stable insulation performance, strong overload tolerance and outstanding weather resistance, making it the ideal power transformation solution for large industrial parks, urban central power distribution stations and comprehensive municipal power supply projects.

2.  Technical Parameters

3. Core Purpose

The core purpose of the 1250kVA and 1600kVA 20kV 400V oil immersed transformer is to implement safe, efficient and continuous medium-to-high capacity voltage conversion in 20kV urban and industrial power distribution systems. This heavy-duty oil-filled step-down transformer solves the voltage level mismatch between medium-voltage transmission grids and low-voltage terminal electrical equipment, converting high 20kV grid voltage into standard 400V usable power for industrial production, commercial operation and municipal public power supply.

In practical grid operation, this three-phase oil immersed transformer undertakes key functions including grid voltage stabilization, load shunting, circuit isolation and power safety protection. It effectively suppresses three-phase voltage imbalance and power grid harmonic interference, reduces voltage fluctuation and current surge caused by large load switching, and greatly improves overall power supply quality and grid operational stability. Designed for long-term full-load operation, it provides stable power guarantee for high-power electrical equipment, avoids equipment damage and power outage risks caused by overload and voltage instability, and optimizes the power supply capacity of regional 20kV power grids.

4. Application Scenarios

Featuring large load capacity, high operational stability and strong environmental adaptability, the 1250kVA 1600kVA 20kV/400V oil immersed power transformer is widely applied in high-power power supply scenarios that require continuous and stable power consumption. It is the preferred energy-saving transformation equipment for large industrial and municipal power distribution projects:

• Large Industrial Park Power Distribution: Suitable for comprehensive industrial parks, manufacturing bases, chemical plants and machinery processing clusters with high centralized power consumption. It supports long-term full-load operation of multiple production lines and high-power industrial equipment, meeting stable industrial power demand.

• Urban Centralized Power Supply Projects: Applied in urban central business districts, large residential communities, commercial plazas and urban comprehensive service centers. It undertakes regional large-scale civilian and commercial power distribution tasks to ensure uninterrupted daily power supply.

• Municipal Public Infrastructure: Ideal for large hospital campuses, university integrated campuses, urban subway supporting facilities and municipal water supply and drainage projects. It provides reliable power guarantee for key public infrastructure that requires 24-hour continuous power supply.

• Large-scale New Energy Grid Connection: Matched with medium and large distributed photovoltaic power stations and decentralized wind power generation projects. It completes voltage conversion and grid-connected power distribution for new energy power generation equipment, stabilizing new energy grid access quality.

• Field Heavy-duty Engineering Projects: Adaptable for long-term power supply of large mining areas, water conservancy hub projects and large-scale road construction projects. It resists load impact and adapts to complex and harsh field power supply environments.

• Power Grid Upgrading & Capacity Expansion: Widely used in urban and rural 20kV power grid renovation and capacity expansion projects, replacing old high-loss transformers to improve grid power supply efficiency and reduce operational energy consumption.

5. Product Features

This 1250kVA & 1600kVA 20kV 400V oil immersed distribution transformer adopts upgraded energy-saving structure and mature manufacturing technology. It has obvious advantages in energy consumption control, operational safety, structural durability and load adaptability, perfectly fitting the high-standard operation requirements of modern 20kV medium-voltage power grids:

• Ultra-low Energy Loss & High Efficiency: The core iron core adopts high-permeability cold-rolled silicon steel sheets with full oblique lap process, which minimizes magnetic leakage and no-load iron loss. The integral oxygen-free copper winding structure effectively reduces winding resistance and load copper loss. The overall power loss is far lower than national standard values, realizing energy-saving and high-efficiency operation and greatly reducing long-term grid operation costs.

• Stable Voltage Output & Strong Anti-interference: Adopts advanced Dyn11 vector group design, which can effectively balance three-phase current, suppress grid harmonics and eliminate voltage deviation. The multi-grade off-circuit voltage regulation device adapts to different regional grid voltage fluctuations, ensuring constant and standard 400V low-voltage output and improving terminal power supply quality.

• Fully Sealed & Anti-aging Structure: Integral fully sealed corrugated oil tank design requires no frequent oil replenishment. The elastic corrugated structure automatically adjusts internal pressure with temperature changes, preventing tank deformation and oil leakage. The external high weather resistance anti-corrosion coating resists ultraviolet aging, rain erosion and dust accumulation, extending equipment service life significantly.

• Excellent Heavy-load Adaptability: Optimized internal winding and heat dissipation structure enhances overload resistance and short-circuit impact resistance. The ONAN oil immersed self-cooling system provides efficient and stable heat dissipation even under long-term full-load and peak load conditions, avoiding overheating failure and ensuring continuous stable operation.

• High Operational Safety & Stability: Strict 20kV medium-voltage insulation design ensures high insulation strength and breakdown resistance. The equipment is equipped with natural over-current and over-voltage protection capabilities, with extremely low failure rate in long-term operation, effectively ensuring safe operation of power grid and terminal high-power equipment.

• Low Noise & Easy Maintenance: Optimized vibration reduction structure and mute winding technology effectively reduce operating noise, meeting urban environmental protection standards. The standardized component design makes daily inspection, oil quality detection and routine maintenance simple and convenient, lowering later operation and maintenance labor and time costs.

6. FAQ (Frequently Asked Questions)

Q1: How to select between 1250kVA and 1600kVA 20kV 400V oil immersed transformers?

Both models adopt identical 20kV/400V voltage level, structural technology and safety standards. The core difference lies in load capacity and application scenarios. The 1250kVA oil immersed transformer is suitable for medium heavy-load scenarios such as single industrial workshops, medium-sized residential communities and conventional municipal facilities, with balanced energy consumption and load performance. The 1600kVA oil filled distribution transformer features larger rated capacity and stronger instantaneous overload resistance, more suitable for high-load scenarios including large industrial clusters, central business districts and key infrastructure projects with large peak power consumption. Users can select models based on actual peak load and reserved power margin.

Q2: Is this 20kV 400V oil immersed transformer suitable for long-term full-load outdoor operation?

Yes, this series of 1250kVA/1600kVA 20kV power transformers is specially optimized for heavy-load outdoor working conditions. The fully sealed oil tank structure completely isolates internal insulating oil from external humid and dusty air, preventing oil deterioration and internal insulation damp failure. The overall anti-corrosion and weather-resistant structure resists rain, snow, wind and ultraviolet erosion. The efficient ONAN self-cooling system stably dissipates heat even under long-term full-load operation, supporting 24-hour unattended continuous outdoor operation, which is widely recognized in outdoor substation and industrial power distribution projects.

Q3: What routine maintenance work is required for high-capacity 20kV oil immersed transformers?

This high-capacity oil immersed transformer has low daily maintenance requirements. Operators need to regularly check the insulating oil level and clarity to ensure the oil level is within the standard range and replace aging turbid oil in time. Clean dust and sundries on the surface of heat dissipation corrugations to guarantee unobstructed heat dissipation and prevent overheating faults. Regularly inspect the tightness of high and low voltage terminals and oil tank sealing points to avoid oil leakage and poor contact. In addition, test insulation resistance and operating temperature periodically to prohibit long-term overload operation. With standardized maintenance, the equipment service life can reach more than 20 years.