250MVA 345kV Power Transformer, China 250MVA 345kV Power Transformer Manufacturers, Suppliers, Factory - Yawei Transformer

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250MVA 345kV Power Transformer

• Up to 250MVA

• Generator Step-up Transformers (Renewable and Nuclear)

• Transmission Network Transformers

• Distribution Small and Medium Transformers

• Transformers other than standard specifications are also manufactured according to customer request.

What is a power transformer?

Power transformers are electrical instruments used in transmitting electrical power from one circuit to another without changing the frequency.
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In 2025, we stood out in international bidding and received orders for special transformers from power enterprises in the United States, Australia and other countries. The products needed to meet strict requirements such as large capacity, 345kV ultra-high voltage and full insulation. Subsequently, we optimized the work plan and completed the independent design, manufacturing and self-inspection of the first fully insulated ultra-high voltage large-capacity transformer in China in less than three months. All factory tests were successfully passed and the product was packed and sent to overseas customers. Previously, no domestic enterprise had ventured into this field.

We tailor our products to meet the needs of our customers. The delivery cycle for our customized transformers is only 3 to 6 months, which is much shorter than the average 18-month delivery period of enterprises in Europe and America. This "Chinese speed" has become a key advantage in winning the trust of overseas customers.

Company Advantages

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    JiangsuYawei transtormers have been successtuly exported to severa countries incuding the United Stotes, Canada, Panama, Venezuela, Uzbekistan,Australia,and Bulgaria.

    We have sufficient production capacity to ensure that goods can be delivered on time. We have professional after-sales teams around the world, this ensures prompt trouble shooting and resolution of any issues you may encounter.

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    Whether you are a utlity company, transformer distributor, or builder, you can purchase JiangsuYawei's power transformer with confidence,knowing that you are investing in a reliable and reputabe product.Experience the efficiency and reliablity of JiangsuYawei Transtormer tailored to meet your specific needs.

JSYW Power Transformer Product

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The JSYW Power Transformer product is a premium-grade power transformer that provides reliable service to customers. The transformer is manufactured using high-quality raw material procured from the most reputed vendors in the industry.

Several features like easy installation and low maintenance cost ensure optimum performance under unfavorable weather conditions for long durations.

Parameters

TECHNICAL DATA SHEET FOR 250MVA TRANSFORMERS
No. Description Unit Technical data
1 Transformer type Oil immersed power Transformer.SFZ-250000/345
2 Supplier Jiangsu Yawei Transformer Co., Ltd
3 Applicable standard IEEE C57
4 Installation Outdoor
5 Ambient temperature (-6.67~+40),The annual average temp. +30
6 Altitude m ≤1000
7 Rated power kVA 250000
8 Rated voltage-HV/LV winding kV 345/34.5
9 Maximum operating voltage-HV/LV kV 362/36
10 Rated frequency Hz 60
11 Cooling system ONAN/ONAF1/ONAF2(185/225/250MVA)
12 Number of winding 2
13 Number of phase 3
14 Tap changer OLTC(Shanghai Huaming)3xSHZVI-400-363C-18353W
15 Tap range kV 345±16x0.625%
16 Coolant Mineral oil
17 Impedance@185MVA % 10.5% ±7.5%(tolerance)
18 The temperature rise of top oil K 60
19 The temperature rise of Avg. winding K 65
20 Basic Impulse insulation level
a) HV winding kV 1175
b) LV winding kV 200
c) LVN neutral kV 200
21 Power frequency withstand voltage
a) HV winding kV 510
b) LV winding kV 70
c) LVN neutral kV 70
22 Vector Group Dyn1
23 Core material HiB silicon steel
24 Winding material Copper
25 Type of tank Cover with bolts
26 Location of HV Top mounted
27 Location of LV & LVN Bushings Top mounted

Applications

Power transformers used in electric power generation and distribution Used for reducing power losses during electric power transmission They are preferred in cases where the load is required to run at full capacity 24×7. It is used in high voltage step-up and step-down.
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    Industrial Field

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    Petrochemical Industry

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    Power System

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    Transportation

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Certificate

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We are working around the world

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