35Kv 630Mva 100Mva Three Phase Oil Immersed Transformers

1. Product Description

35Kv 630Mva 100Mva Three Phase Oil Immersed Transformers are large-scale industrial power transformers designed for high-capacity energy conversion and bulk power transmission in 35kV medium-voltage main grid systems. Unlike conventional small and medium kVA-level distribution transformers, these MVA-grade oil immersed power transformers are engineered specifically for heavy-duty grid operation, large industrial energy stations and centralized power transmission scenarios. Covering two mainstream high-capacity specifications of 100MVA and 630MVA, this series of three-phase oil filled transformers fully complies with IEC 60076 international power transformer standards and national grid technical specifications, serving as core voltage conversion and power transmission equipment for regional main substations and large energy projects.

Manufactured with ultra-low loss high-grade silicon steel core and fully reinforced oxygen-free copper winding structure, these 35kV large power transformers effectively suppress no-load excitation loss and long-term full-load operating heat generation, delivering stable and efficient bulk power transmission performance. Adopting standard three-phase balanced winding layout and Dyn11 vector group configuration, the equipment maintains excellent three-phase current and voltage balance, effectively filtering grid harmonics, restraining zero-sequence current and improving overall power grid operation stability. Equipped with advanced OFAF forced oil circulation and air forced cooling system and fully sealed heavy-duty oil tank structure, the transformer completely isolates internal insulating components from external harsh environmental interference, avoiding insulating oil aging, moisture penetration and internal insulation degradation. Tailored for long-term continuous full-load operation of 35kV main power grids, 100MVA and 630MVA high-capacity oil immersed transformers provide reliable large-scale power support for grid expansion, industrial energy base construction and new energy centralized grid connection projects.

2.Technical Parameters

3. Core Purpose

The core purpose of 35Kv 630Mva 100Mva Three Phase Oil Immersed Transformers is to provide large-capacity, high-efficiency and safe bulk power voltage conversion and energy transmission for 35kV regional main power grids. As essential backbone power transformation equipment for medium-voltage grid systems, these MVA-grade oil immersed power transformers undertake the key task of converting 35kV high-voltage electric energy into multi-grade usable voltage, realizing long-distance, large-volume stable power distribution for regional power loads. Different from conventional kVA-level distribution transformers for terminal power supply, 100MVA and 630MVA high-capacity transformers focus on main grid energy transfer and centralized power regulation, supporting overall grid load balance and peak power supply guarantee.

In actual power grid operation, these three-phase oil immersed power transformers perform core functions including main grid voltage stabilization, large-load power distribution, new energy grid-connected power regulation and grid fault isolation. The 100MVA model is suitable for regional small and medium-scale main grid power transmission and industrial park centralized power supply, while the super-large 630MVA model meets ultra-large load demands of urban main substations and large energy bases. Both specifications effectively suppress grid voltage fluctuation and harmonic interference during high-capacity power transmission, reduce power transmission loss, optimize regional power grid operation efficiency, and ensure safe and stable operation of large-scale power consumption and new energy grid connection projects.

4. Application Scenarios

With ultra-large load capacity, excellent continuous operation stability and high-standard grid adaptability, 35Kv 630Mva 100Mva Three Phase Oil Immersed Transformers are widely used in backbone grid construction, large industrial energy projects and new energy power generation bases. They are indispensable core power equipment for high-capacity power transmission and centralized power regulation in 35kV main grid systems:

• Regional 35kV Main Substation Construction: The 100MVA transformer is commonly used for urban district and county-level main substations, while the 630MVA super-large capacity model matches central urban backbone substations. Both provide stable bulk power distribution support for regional urban comprehensive power consumption and grid load balancing.

• Large Industrial Energy Base Power Supply: Suitable for large chemical industrial parks, metallurgical bases, mining industrial clusters and heavy industrial zones. These high-capacity oil immersed transformers meet long-term continuous full-load power consumption demands of heavy industry and large-scale manufacturing equipment.

• Centralized New Energy Grid Connection Projects: Widely applied in large-scale centralized photovoltaic power stations, wind power bases and energy storage power stations. They complete high-capacity voltage conversion and grid-connected power quality optimization, solving batch grid-connected power transmission problems of new energy power generation equipment.

• Urban Power Grid Capacity Expansion & Upgrading: Used for reconstruction and capacity expansion of old urban power grids, replacing old low-capacity and high-loss transformers to solve insufficient regional power supply capacity and overload operation problems, improving urban grid power supply reliability.

• Large Infrastructure Supporting Power Projects: Adaptable for national key engineering projects, large transportation hubs, industrial demonstration zones and comprehensive economic development zones, providing reliable high-capacity power guarantee for large-scale public infrastructure and industrial supporting facilities.

• Cross-regional Power Transmission & Distribution: Serving as intermediate power transformation equipment for regional grid interconnection and cross-area power transmission, realizing reasonable allocation of power grid resources and improving the overall utilization rate of regional electric energy.

5. Product Features

35Kv 630Mva 100Mva Three Phase Oil Immersed Transformers adopt upgraded ultra-low loss large power transformer manufacturing technology and heavy-duty oil-immersed cooling system. Compared with conventional medium and small capacity transformers, this MVA-grade series has outstanding advantages in large-load stability, energy-saving performance, safety protection and continuous operation capability, fully adapting to long-term full-load heavy-duty operation of 35kV backbone power grids:

• Ultra-large Capacity & Strong Load Adaptability: Covering 100MVA large capacity and 630MVA super-large capacity, this transformer series fully meets various high-capacity power transmission demands of 35kV main grids. It stably copes with long-term full-load operation and short-term peak load surges, solving the capacity bottleneck problem of traditional small and medium transformers in large-scale power supply scenarios.

• Ultra-low Loss & High Grid Operation Efficiency: Adopting imported high-permeability ultra-low loss silicon steel core and high-precision winding winding process, the transformer effectively reduces no-load loss and load operation loss during high-capacity power transmission. It significantly lowers long-term grid transmission energy consumption and operation costs, with excellent energy-saving and emission-reduction benefits.

• On-load Voltage Regulation & Precise Power Control: Equipped with high-precision on-load tap changer, the transformer can dynamically adjust voltage in real time under live operation conditions, automatically compensating grid voltage deviation caused by large load changes. It maintains stable terminal voltage of the main grid and effectively improves power grid operation quality.

• OFAF Efficient Forced Cooling System: Adopting advanced forced oil circulation and forced air cooling technology, it realizes rapid and uniform heat dissipation of internal windings and iron core. The cooling efficiency is far higher than traditional natural cooling transformers, ensuring stable temperature control under long-term full-load and overload operation.

• High-strength Anti-short Circuit & Safety Performance: Internal windings adopt integral reinforcement and anti-short circuit structure design, with strong resistance to short-circuit impact and sudden load shock. The enhanced 35kV high-grade insulation structure and lightning protection design effectively resist grid overvoltage and lightning surge interference, ensuring safe operation of main grid equipment.

• Full Sealing & Long Service Life: Heavy-duty fully sealed welded oil tank structure completely isolates internal insulating oil and electrical components from external humid air, dust and corrosive substances. It avoids insulating oil deterioration and insulation aging, greatly reducing equipment failure rate and extending the overall service life up to 30 years or more.

6. FAQ (Frequently Asked Questions)

Q1: What is the difference between MVA-grade power transformers and conventional kVA transformers?

MVA-grade transformers represented by 100MVA and 630MVA models are professional large-scale power transformation equipment for main grid bulk power transmission, while kVA-level transformers are mostly used for terminal distribution power supply. In terms of capacity, 1 MVA equals 1000 kVA, so these two models have far larger load bearing capacity than conventional distribution transformers. In terms of performance, 35Kv 630Mva 100Mva Three Phase Oil Immersed Transformers adopt forced cooling and on-load voltage regulation design, supporting long-term full-load operation and dynamic voltage adjustment. They are mainly used for main substation grid connection and large industrial power supply, focusing on overall grid power transmission and load allocation, while kVA transformers only serve small terminal loads with simple voltage stabilization functions.

Q2: How to choose between 100MVA and 630MVA 35kV oil immersed power transformers?

Capacity selection mainly depends on regional grid load scale, peak power demand and future expansion planning. The 100MVA three-phase oil immersed transformer is suitable for county-level regional substations, medium-sized industrial parks and conventional new energy power stations with moderate total load, featuring high operation efficiency and low idle loss. The 630MVA super-large capacity model is targeted at urban backbone substations, super-large industrial clusters and large-scale new energy bases with ultra-high power consumption. It can bear super-large bulk power transmission tasks and reserve sufficient capacity margin for long-term regional economic development and grid load growth, avoiding repeated equipment replacement and grid renovation.

Q3: What key maintenance items are required for high-capacity 35kV MVA-grade oil immersed transformers?

Different from small transformers with simple maintenance, 100MVA and 630MVA large power transformers require standardized professional regular maintenance. Daily work includes real-time monitoring of oil temperature, winding temperature, operating noise and oil level, as well as regular inspection of cooling fan and oil pump operation status. Regular sampling detection of insulating oil dielectric strength and water content is necessary to prevent oil aging and insulation performance decline. Operators need to periodically test winding insulation resistance, short-circuit impedance and on-load tap changer working status. Timely cleaning of cooling system dust and fastening high-voltage wiring terminals are also essential. Scientific standardized maintenance can effectively avoid main grid operation faults and ensure long-term stable full-load operation of the transformer.