125kva 160kva 20kv 400v Oil Immersed Transformer

125kva 160kva 20kv 400v Oil Immersed Transformer

1. Product Description

The 125kVA 160kVA 20kV 400V oil immersed transformer is a standard three-phase medium-voltage step-down distribution transformer designed for 20kV level power grid systems. As a mainstream oil-filled power transformation device in urban and rural power distribution, industrial power supply and outdoor substation projects, this 20kV to 400V oil immersed power transformer stably converts 20kV high-voltage grid power into 400V low-voltage industrial and civil power, perfectly matching the voltage demand of terminal electrical equipment. Manufactured in strict accordance with IEC60076 and national power industry standards, the equipment features mature oil-immersed cooling technology, reliable insulation performance and low loss operation characteristics.

Adopting high-quality grain-oriented cold-rolled silicon steel sheets and high-purity oxygen-free copper windings, the 125kVA/160kVA 20kV 400V oil immersed distribution transformer effectively reduces no-load loss and operating heat generation. The fully sealed corrugated oil tank structure isolates internal insulating oil from external air, preventing oil aging, moisture and dust intrusion, which greatly improves operational stability and extends service life. Different from 35kV high-voltage transformers, this 20kV medium-voltage transformer is more targeted for regional urban power grids, township power renovation and small and medium-load industrial scenarios, with higher cost performance and stronger scene adaptability, and can run continuously and stably under full-load and long-term working conditions.

2.  Technical Parameters

3. Core Purpose

The core purpose of the 125kVA and 160kVA 20kV 400V oil immersed transformer is to realize safe, stable and efficient voltage step-down conversion in 20kV medium-voltage power distribution systems. It solves the voltage level mismatch between high-voltage power grids and terminal low-voltage electrical equipment, and is the core power conversion equipment for medium and small-capacity power supply systems. This oil-filled step-down transformer can effectively stabilize output voltage, suppress three-phase voltage imbalance and power grid harmonic interference, and significantly improve power supply quality and grid operation safety.

In actual power grid operation, this three-phase oil immersed transformer also undertakes key functions such as power distribution shunting, circuit isolation protection and load buffering. It can effectively avoid equipment damage and power supply failure caused by grid voltage fluctuation, current surge and instantaneous overload. For decentralized small and medium loads, it provides continuous and stable 400V power guarantee, meeting the long-term operation requirements of industrial production, residential life and public facility power systems, and is an essential device for optimizing 20kV regional power grid configuration.

4. Application Scenarios

The 125kVA 160kVA 20kV/400V oil immersed power transformer features wide environmental adaptability and flexible load matching, and is widely used in various 20kV medium-voltage power distribution scenarios. It covers civil power supply, industrial supporting, public infrastructure and new energy supporting fields, and is the preferred energy-saving transformer for medium and small-scale power supply projects:

• Township & Rural Power Grid Upgrading: Suitable for rural power grid reconstruction, township centralized power supply and suburban community power distribution projects. The 125kVA model matches scattered residential light loads, while the 160kVA model adapts to centralized community power consumption, fully meeting daily lighting, household electrical and civilian power demand.

• Small & Medium Industrial Production: Ideal for small processing workshops, machinery manufacturing factories, building material processing plants and mini industrial parks. It provides stable 400V industrial power for production lines, mechanical equipment and auxiliary electrical systems, adapting to long-term continuous production power consumption.

• Public Infrastructure Power Supply: Applied in campus power distribution, hospital auxiliary power systems, urban community service centers, scenic area supporting facilities and urban street power supply. It ensures safe and uninterrupted power supply for public service equipment.

• Outdoor Pole-mounted & Ground-mounted Substations: The whole machine is waterproof, dustproof and anti-corrosive, suitable for outdoor open-air substations, overhead line power distribution points and remote field power supply stations, supporting long-term unattended outdoor operation.

• Distributed New Energy Supporting: Matched with small rooftop photovoltaic power stations, decentralized wind power generation and rural new energy power generation projects, completing grid-connected voltage conversion and power distribution of new energy power generation equipment.

• Temporary Engineering Power Supply: Widely used in road construction, water conservancy projects, mining field operation and temporary construction power supply scenarios, with flexible installation and strong load adaptability, meeting temporary high-stability power supply needs.

5. Product Features

This 125kVA & 160kVA 20kV 400V oil immersed distribution transformer adopts upgraded energy-saving design and optimized structural technology, with prominent advantages in energy consumption control, operational stability, environmental resistance and later maintenance. It outperforms traditional ordinary transformers in comprehensive performance and is more suitable for domestic and foreign 20kV medium-voltage power grid operation standards:

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

• Stable Voltage Output & Strong Anti-interference: Adopts advanced Dyn11 connection group design, which can effectively balance three-phase current, suppress power grid harmonics and reduce voltage fluctuation. The built-in multi-grade off-circuit voltage regulation device can adapt to grid voltage deviation in different regions, ensuring constant and stable 400V low-voltage output and improving terminal power supply quality.

• Sealed & Durable Structure: Integral fully sealed corrugated oil tank design requires no oil replenishment for long-term operation. The elastic corrugated structure automatically adjusts internal pressure with temperature changes, avoiding tank deformation and oil leakage. The external anti-corrosion electrostatic spraying process resists ultraviolet aging, rain erosion and dust accumulation, greatly prolonging equipment service life.

• Safe & Reliable Operation: Strict 20kV medium-voltage insulation design ensures high insulation strength and strong breakdown resistance. The equipment has excellent over-current, over-voltage and overload protection capabilities, with low failure rate and strong short-circuit resistance. It can operate stably in harsh environments such as high temperature, low temperature and high humidity.

• Low Noise & Environmental Protection: Optimized iron core vibration reduction structure and mute winding technology effectively reduce operating noise. The oil-immersed self-cooling (ONAN) mode requires no auxiliary fan equipment, with zero operating noise and no environmental pollution, meeting urban and rural environmental protection power supply standards.

• Easy Installation & Low Maintenance: Compact integrated structure with small floor space, supporting pole-mounted and ground-mounted dual installation methods. Standardized internal components and simple structural design make daily inspection, oil detection and routine maintenance convenient, greatly reducing later operation and maintenance labor and time costs.

6. FAQ (Frequently Asked Questions)

Q1: What is the practical difference between 125kVA and 160kVA 20kV 400V oil immersed transformers?

The two models adopt the same 20kV/400V voltage level, structural process and cooling mode, with the core difference lying in load capacity and applicable scenarios. The 125kVA oil immersed transformer is more suitable for light-load scenarios such as single rural communities, small shops and mini office buildings, with lower no-load loss and more energy-saving operation under low-load conditions. The 160kVA oil filled distribution transformer has higher rated load capacity and stronger instantaneous overload resistance, which is more suitable for medium-load scenarios such as small factories, centralized residential communities and supporting public facilities. Users can select models according to actual peak power consumption and load growth margin.

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

Absolutely. This series of 125kVA/160kVA 20kV power transformers is specially optimized for outdoor working conditions. The whole machine adopts thickened steel plate welding and high weather resistance anti-corrosion coating, which can resist rain, snow, wind and sand erosion and ultraviolet aging. The fully sealed oil tank structure completely isolates internal insulating oil from external humid air, preventing oil deterioration and internal component damp damage. The ONAN self-cooling system adapts to natural temperature changes in outdoor environments, supporting 24-hour long-term unattended continuous operation, and is widely used in outdoor overhead power distribution and field substation projects.

Q3: What daily maintenance work is required for 20kV 400V oil immersed transformers?

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