500Kva 35Kv Three Phase Oil Immersed Transformers

500Kva 35Kv Three Phase Oil Immersed Transformers

1. Product Description

500Kva 35Kv Three Phase Oil Immersed Transformers are high-efficiency medium-capacity three-phase power distribution transformers specially developed for 35kV medium-voltage power grid systems and industrial power supply projects. Adopting mature S11 and S13 low-loss technical architecture, these 35kV oil-filled distribution transformers strictly comply with IEC 60076 and GB/T 1094 international power industry standards, serving as core step-down power conversion equipment for industrial parks, municipal substations and rural grid upgrading projects. As one of the most widely used medium-capacity three-phase oil immersed transformers in 35kV voltage level power distribution scenarios, this model stably converts 35kV high medium voltage into standard 400V low-voltage three-phase power, fully matching industrial production and civil centralized power consumption requirements.

This industrial-grade three-phase oil immersed transformer adopts high-permeability low-loss grain-oriented silicon steel core and full oxygen-free copper three-phase windings, effectively reducing no-load excitation loss and load copper loss during long-term continuous operation. The optimized core stacking process minimizes magnetic leakage and operational noise, achieving outstanding energy-saving and mute effects. Equipped with a standard Dyn11 vector group structure, the equipment effectively balances three-phase voltage and current, suppresses grid harmonics and zero-sequence current, and solves common power quality problems such as unbalanced load and voltage fluctuation in medium-voltage power distribution networks. The fully sealed corrugated oil tank structure and standard ONAN oil natural air natural cooling system isolate internal components from external dust, moisture and corrosive gases, preventing insulating oil aging and insulation degradation. With stable load capacity, strong short-circuit resistance and ultra-low operational loss, this 500kVA 35kV three-phase oil immersed transformer delivers reliable and cost-effective power transformation solutions for various medium-load industrial and municipal power supply scenarios.

2.  Technical Parameters

3. Core Purpose

The core purpose of 500Kva 35Kv Three Phase Oil Immersed Transformers is to provide efficient, stable and safe medium-to-low voltage conversion and three-phase power distribution for 35kV medium-voltage power grids. As a key medium-capacity terminal power transformation device, this 35kV oil immersed power transformer solves the voltage level mismatch between high-voltage overhead transmission lines and low-voltage industrial and civil electrical equipment, converting unstable 35kV medium voltage into standardized 400V three-phase power that meets global electrical safety codes.

In daily power grid and industrial operation, this low-loss three-phase oil filled transformer undertakes multiple core functions including terminal grid voltage stabilization, three-phase load balancing, harmonic suppression and electrical circuit isolation. With 500kVA moderate rated capacity, it perfectly fills the gap between small-capacity transformers with insufficient load margin and large-capacity models with excessive idle loss. It effectively reduces terminal voltage drop caused by medium-load power consumption, optimizes on-site power quality, lowers long-term grid operational energy consumption, and ensures continuous, stable and safe power supply for industrial production, municipal infrastructure and large-scale residential cluster scenarios.

4. Application Scenarios

Benefiting from moderate load capacity, ultra-low energy loss, strong short-circuit resistance and excellent outdoor environmental adaptability, 500Kva 35Kv Three Phase Oil Immersed Transformers are widely applied in various medium-load three-phase power distribution scenarios of 35kV power grids. They are the preferred power transformation equipment for industrial supporting, grid renovation, municipal engineering and new energy grid connection projects:

• Medium-sized Industrial Factory Power Supply: Ideal for machinery processing plants, food manufacturing workshops, light chemical factories and building materials processing enterprises. The 500kVA stable load capacity fully meets daily continuous production power demand and short-term peak load surges, ensuring stable operation of industrial mechanical equipment and production lines.

• 35kV Urban & Rural Power Grid Upgrading: Widely used in capacity expansion and loss reduction transformation of aging urban and rural medium-voltage power grids. Replacing outdated high-loss old transformers, this modern low-energy-consumption oil immersed transformer effectively improves regional power supply capacity, stabilizes terminal voltage quality and reduces overall grid operation costs.

• Municipal Public Infrastructure Projects: Suitable for urban sewage treatment plants, water supply pump stations, highway service areas, railway supporting facilities and urban comprehensive substations. It provides 24-hour uninterrupted stable three-phase power guarantee for municipal public facilities and engineering equipment.

• Large Residential & Commercial Cluster Power Distribution: Adaptable for high-density residential communities, community commercial zones and comprehensive service facilities. It balances three-phase load distribution, avoids voltage fluctuation caused by concentrated peak power consumption, and improves residential power supply stability.

• Distributed New Energy Grid Connection: Matched with medium-sized photovoltaic power stations, small wind power generation systems and energy storage supporting projects. It completes stable voltage conversion and grid-connected power quality regulation, suppresses new energy grid-connected harmonics, and ensures safe and efficient grid access of decentralized new energy power.

• Mining & Field Engineering Power Supply: Perfect for open-pit mining bases, water conservancy engineering sites and remote field construction projects. With strong anti-interference and overload resistance, it adapts to complex outdoor power consumption environments and provides reliable power support for engineering operations.

5. Product Features

500Kva 35Kv Three Phase Oil Immersed Transformers adopt upgraded S13 low-loss manufacturing technology and mature industrial oil-immersed cooling structure. Compared with traditional old-generation 35kV transformers, this medium-capacity three-phase transformer has comprehensive advantages in energy saving stability, safety durability and operational economy, fully adapting to long-term unattended heavy-duty operation of 35kV medium-voltage power grids:

• Ultra-low Energy Loss & High Energy Efficiency: Adopting high-permeability low-loss silicon steel core and high-purity oxygen-free copper winding, the transformer minimizes no-load magnetic loss and load operating loss. All energy efficiency indicators meet national first-class energy efficiency standards, effectively reducing long-term power consumption and grid operation costs with remarkable energy-saving benefits.

• Dyn11 Balanced Three-phase Output: Standard Dyn11 vector group design realizes precise balance of three-phase voltage and current, effectively inhibiting zero-sequence current and power grid harmonics. It maintains stable voltage output under unbalanced load conditions, significantly improves terminal power quality and reduces electrical equipment failure rate caused by power imbalance.

• Enhanced Short-circuit & Overload Resistance: Optimized internal winding reinforcement structure and enhanced insulation design greatly improve short-circuit impact resistance and peak load tolerance. The 500kVA moderate capacity reserves sufficient load margin to cope with sudden load surges and meet future user load growth demands.

• Fully Sealed Anti-aging & Leak-proof Structure: Integral welded corrugated oil tank adopts fully sealed maintenance-free design, completely isolating internal core, windings and insulating oil from external humid air, dust and corrosive substances. It prevents oil deterioration and insulation aging, eliminates common oil leakage faults, and extends equipment service life up to 30 years.

• Efficient ONAN Self-cooling System: Natural oil circulation and air natural heat dissipation mode ensure uniform and efficient heat dissipation. It quickly discharges internal heat generated by long-term full-load operation, avoids equipment overheating failure, and ensures continuous stable operation under variable load conditions.

• All-weather Outdoor Adaptability & Low Maintenance: The whole machine adopts heavy-duty anti-corrosion electrostatic spraying process, resisting ultraviolet aging, rain erosion, frost and snow damage. It can operate stably in harsh outdoor environments all year round. The modular standardized structure simplifies daily inspection and maintenance work with low failure rate and long-term operational stability.

6. FAQ (Frequently Asked Questions)

Q1: What are the advantages of a 500kVA 35kV three-phase oil immersed transformer for industrial power distribution?

In practical industrial and municipal power distribution projects, the 500Kva 35Kv Three Phase Oil Immersed Transformer has outstanding comprehensive cost performance. Its moderate 500kVA capacity avoids the idle energy waste of large-capacity transformers and solves the insufficient load margin of small-capacity models, perfectly matching medium-load industrial production and municipal centralized power consumption. Adopting low-loss copper winding and silicon steel core design, it effectively reduces long-term operational power consumption. The Dyn11 wiring method optimizes power quality and reduces equipment failure rate, while the fully sealed structure greatly lowers daily maintenance workload, making it the most practical and reliable mainstream model for 35kV medium-load power distribution scenarios.

Q2: Can this 35kV oil immersed transformer operate stably in harsh outdoor environments?

Yes, this industrial-grade 35kV three-phase oil immersed transformer is fully optimized for long-term outdoor unattended operation. It adopts enhanced 35kV medium-voltage insulation structure and 150kV BIL lightning protection design, with excellent over-voltage resistance and lightning surge resistance. The fully sealed corrugated oil tank completely blocks external moisture and dust, preventing internal insulation damp and insulating oil aging. The heavy-duty anti-corrosion shell resists extreme high and low temperatures, heavy rain erosion and wind-sand impact. The mature ONAN passive self-cooling system ensures stable heat dissipation under rated full load, supporting 24-hour uninterrupted all-weather outdoor operation throughout the year.

Q3: What routine maintenance is required for a 500kVA 35kV three-phase oil immersed transformer?

This medium-capacity 35kV oil immersed distribution transformer features low daily maintenance threshold and stable long-term performance. Daily routine work mainly includes visual inspection of oil tank welding seams, sealing points and radiator surfaces to check for oil leakage, deformation and dust accumulation. Operators need to regularly confirm the insulating oil level and oil clarity to ensure they are within the standard range, and clean radiator dust to guarantee unobstructed heat dissipation. Periodic winding insulation resistance testing and three-phase voltage balance detection are required, along with fastening high and low voltage wiring terminals. Long-term overload operation should be avoided. With standardized simple maintenance, the transformer can maintain stable working performance for more than 30 years.