144mva 125mva 36kv Electric Arc Furnace Transformer Special Furnace Transformers for Eaf Steel Making

Product Description

HSSPZ-140000/35KV 140MVA EAF ARC TRANSFORMER
 

Product Description

140MVA, 35KV arc furnace transformer is a large-capacity, medium-high voltage industrial-grade special transformer. Its core function is to provide stable and adjustable high-power electrical energy for arc furnaces, generating high-temperature electric arcs through electrodes to melt metal raw materials. Based on its capacity (140MVA, corresponding to an arc furnace with a nominal capacity of approximately 120-150 tons) and primary side voltage (35KV, compatible with industrial medium-voltage distribution networks), its application scenarios are highly focused on the field of large-scale heavy industry metal smelting and processing.
 

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Product Parameters

Operating voltage	33kV±5%
Frequency	50Hz  ±1%
Operation	Continuously
Rated capacity	140 MVA + 20% Overload
Rated primary current	2449.4 A    (+ 20% Overload)

Insulation level Winding: Um: AC: BIL:	MV         LV 52 kV       3,6 kV 95 kV       10  kV 250 kV       -
Protection level	IP54
Vector group	Dd0
Secondary connection	Open Delta
System short circuit capacity	1500 MVA
Secondary current	80.829 KA   (+ 20% Overload)
Secondary voltage range	1100 -1000--620 V   (1100 V at tap position 25) (See APPENDIX: Data for reference )
Constant power	1100- 1000 V
Constant current	1000-620  V
Regulation method	Constant flux, Tapping with serials transformer
Short-circuit impedance voltage	8%   (at LV max. Voltage)
Short circuit duration	3 sec

 
OTHER FURNACE TRANSFORMER TECHNICAL DATA:

Transformer Application

I. Core Application Scenario: Large-Scale Arc Furnace Steelmaking (Most Mainstream Scenario)
An arc furnace corresponding to the 140MVA capacity is a 120-150 ton large-scale arc furnace, which is the core equipment for the "short-process steelmaking" in modern iron and steel enterprises. It is mainly used to melt scrap steel (or mixed raw materials of pig iron and scrap steel) into molten steel. The specific applications include:
Smelting of Carbon Steel/Low-Alloy Steel:
It is adapted to the short-process production lines of large iron and steel plants, providing molten steel raw materials for basic steel products such as construction steel (deformed steel bars, wire rods) and mechanical manufacturing steel (plates, sections). Compared with the traditional "blast furnace-converter" long process, short-process steelmaking relies more on arc furnaces. Moreover, the 140MVA-level equipment can achieve high-capacity continuous production (the smelting cycle of a single furnace is about 40-60 minutes, with a daily output of up to 2,000-3,000 tons), making it suitable for iron and steel enterprises in regions rich in scrap steel resources.
Smelting of Special Steel/Alloy Structural Steel:
It is used to produce steel grades with higher requirements for composition control, such as bearing steel, gear steel, die steel, and spring steel. The "high-temperature, strong stirring" characteristics of the arc furnace can accurately adjust the composition of molten steel (e.g., controlling the content of C, Si, and Mn, and removing S and P impurities). The large-capacity 140MVA transformer can stably output high power, ensuring a constant temperature during the smelting process and meeting the process requirements for special steel.
Smelting of Stainless Steel/High-Alloy Steel:
Some large-scale arc furnaces (equipped with LF ladle refining furnaces and VOD vacuum degassing devices) can be used for the rough smelting of stainless steel (e.g., 304, 316 series) or high-alloy steel (e.g., heat-resistant steel, wear-resistant steel). The high-power reserve of the 140MVA transformer can support "long-term high-temperature smelting", ensuring the full dissolution of alloying elements such as chromium and nickel. Additionally, its wide voltage regulation range (suitable for different smelting stages of the arc furnace: arc striking, melting, and refining) reduces composition fluctuations.

II. Extended Application Scenarios: Other High-Temperature Metal Smelting and Refining
In addition to steelmaking, this specification of transformer can also be adapted to large-scale special smelting equipment similar in principle to arc furnaces, and is used for the smelting of non-ferrous metals or special alloys:
Auxiliary Application for Large-Scale Submerged Arc Furnaces (Shaft Furnaces):
For some 100-150MVA submerged arc furnaces that produce high-silicon ferrosilicon (Si ≥ 75%), high-carbon ferromanganese (C ≥ 7%), and other ferroalloys, if the primary side grid voltage is 35KV, a 140MVA-level transformer can be selected (it needs to match the impedance characteristics of the submerged arc furnace). Such scenarios are mainly used for the production of metallurgical auxiliary materials or special alloys, such as ferrosilicon for deoxidation in steel smelting and ferromanganese for alloying in steelmaking.
Refining of Special Metals by Large-Scale Arc Furnaces:
In the smelting of rare metals (e.g., titanium, zirconium) or refractory metals (e.g., tungsten, molybdenum), some large-scale arc furnaces require high-power power supply to reach a high temperature of over 2,000°C. The 140MVA transformer can provide stable electrical energy to support "vacuum arc smelting" or "non-vacuum refining", meeting the requirements of special metals for purity and composition uniformity (e.g., titanium alloy raw materials for aerospace applications).

III. Scenario Characteristics: Why Choose the 140MVA/35KV Specification?
The design of this specification is highly matched to the needs of application scenarios, with the core reasons including:
Capacity Adapted to Large-Scale Production:
The 140MVA capacity corresponds to a 120-150 ton arc furnace, which has a high output per furnace and can meet the "large-scale, high-efficiency" needs of large iron and steel plants (avoiding the problems of low efficiency and high energy consumption caused by frequent smelting of small-capacity equipment).
Voltage Compatible with Industrial Distribution Networks:
35KV is the mainstream voltage level of industrial medium-voltage distribution networks (e.g., the grid voltage of large factories and industrial parks). There is no need to additionally construct ultra-high voltage (110KV and above) access facilities, which reduces the grid transformation cost for enterprises.
Power Regulation Meets Process Requirements:
Arc furnace smelting is divided into three stages: "arc striking (low power), melting (high power), and refining (medium power)". The 140MVA transformer can achieve a wide range of voltage/current regulation (usually a voltage regulation range of ±20%) through an on-load tap-changer, ensuring stable arcs in each stage and reducing electrode consumption and electrical energy waste.
 

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Order Instructions
When you choose our company product, please offer following data:
Transformer model:                     
Rated capacity:                      kVA
Phase:                        Three-phase
                                    Single-phase
Frequency:                 50HZ
                                    60HZ
Rated voltage ( H.V. / L.V. ):                
Tapping range: ±       ×       %
Insulation level: LI       AC       / LI       AC        kv
Veotor group:Dyn11
                       Yyno
                       Other
Short-circuit Impedance:        %
Cooling method:ONAN
                            ONAF
Tapping method:OLTC
                             OCTC
                             Other
Other requirement:                                                                                                                           
Notes:

1.We also can design special products according to customer's particular requirements.

2.The final dimension is subject to outline drawing

Service Guarantee

1.To provide all technical information and drawings as per contract promptly. VILLE is obliged to invite client, if necessary,to attend technical design review.

2.To carry out spot technical service as per client's schedule, offer guideness for installation and commissioning according to technical information and drawings.

3.For relevant auxiliary equipment procured by customers, VILLE will provide relate technical information to meet requirement of equipment interface.

4.To execute stipulations in MOU or agreement signed by seller and buyer strictly.

5.To train staff from client for equipment installation, commissioning, application, maintenance as stipulated in the contract.

6.To reinforce pre-sales, mid-sales, after-sales service, to carry out "24-hour service", "service in advance", "overall process service", "lifelong service" in our manufacturing, installation,commissioning and maintance.

7.To meet spare parts' requirement by customers at anytime.