China's UHV transformer leading global

The world's first 1000kV 1000MVA UHV (two-column) autotransformer was successfully developed by China Xidian Group. This 1000kV 1000MVA UHV transformer was designed and manufactured by Xi'an Xideng Transformer Co., Ltd. and manufactured by Changzhou Xidian Transformer Co., Ltd. It represents the highest level of design and manufacture of UHV transformers in the world today.

According to Xinhua News Agency, Xi'an, September 6, the world’s first 1000kV 1000MVA UHV (two-column) autotransformer was successfully developed by China Xidian Corporation.

Recently, the world's first 1000kV 1000MVA dual-column structure and single column capacity 500MVA UHV autotransformer independently designed and independently manufactured by China XD Group Corporation passed all routine tests and types at Xidian Group Changzhou Xidian Transformer Co., Ltd. The test broke the world record of the maximum capacity of 334 MVA for a single column of UHV transformers in the world, marking a major new progress in the technological innovation of China's UHV AC project construction and the consolidation and development of independent innovation achievements in equipment manufacturing.

This 1000kV 1000MVA UHV transformer was designed and manufactured by Xi'an Xideng Transformer Co., Ltd. and manufactured by Changzhou Xidian Transformer Co., Ltd. It represents the highest level of design and manufacture of UHV transformers in the world today.

The test results show that 1000kV 1000MVA UHV transformers have reached the world's leading level in terms of insulation resistance, partial discharge, temperature rise and noise, and have achieved new progress over the same capacity of three-column UHV transformers. The construction of UHV projects will increase the domestic power transmission and transformation manufacturing technology to the international leading level.

Flux Cored Wire

Flux Cored Wire:


Flux cored wire is also called powder-cored wire and tubular wire. It is divided into two categories: gas-entrained and non-gas-protected. The surface of the flux cored wire is the same as that of the Solid Wire and is made of materials such as low-carbon steel or low-alloy steel with good plasticity. The manufacturing method is to first roll the steel strip into a U-shaped section shape, then fill the U-shaped steel strip with solder powder prepared according to the dosage, roll it tightly with a rolling mill, and finally draw it into welding wires of different specifications.


Flux cored welding wire is a promising new welding material.
(1) Advantages:
1) For the welding of various steel materials, it is very convenient and easy to adjust the composition and proportion of the flux (the general-purpose flux-cored wire is often called the additive as the flux core, and the term flux only appears in the specific flux-cored wire). Requested weld chemistry can be supplied.
2) The process performance is good, and the welding seam is beautifully formed. Combined protection with gas slag is used to obtain good forming. The arc stabilizer is added to stabilize the arc and the droplet transfer is uniform.
3) Fast deposition speed and high production efficiency Under the same welding current, the flux-cored wire has high current density and fast melting speed. The deposition rate is about 85%-90%, and the productivity is about 3-5 times higher than that of electrode arc welding.
4) Larger welding current can be used for all-position welding.
(2) Disadvantages
1) The welding wire manufacturing process is complicated
2) When welding, wire feeding is more difficult than solid welding wire
3) The appearance of the welding wire is easy to rust, and the powder is easy to absorb moisture, so the requirements for the storage and management of the flux-cored welding wire are more stringent



Category

AWS standard

Chemical compostition of deposited metal(wt%)

C

Mn

Si

Cr

Ni

Mo

P

S

V

Cu

Fe

Carbon Steel and High Tensile Strength Steel Flux Cored Wire

CO2 Gas Shield

E71T-1C

0.12

1.75

0.9

0.2

0.5

0.3

0.03

0.03

0.08

0.35

-

Self-shielded

E71T-11

0.04

1.3

0.22

0.02

0.01

0.01

-

-

-

-

-

E71T-GS

0.035

0.5

0.11

0.01

0.01

0.01

-

-

-

-

-

Stainless Steel Flux Cored Wire

CO2 Gas Shield

E308LT1-1

0.04

0.5-2.5

1

18.0-21.0

9.0-11.0

0.75

0.04

0.03

-

0.75

-

E309LT1-1

0.04

0.5-2.5

1

22.0-25.0

12.0-14.0

0.75

0.04

0.03

-

0.75

-

E309LMoT1-1

0.04

0.5-2.5

1

21.0-25.0

12.0-16.0

2.0-3.0

0.04

0.03

-

0.75

-

E316LT1-1

0.04

0.5-2.5

1

17.0-20.0

11.0-14.0

2.0-3.0

0.04

0.03

-

0.75

-

Low-temperature Steel Flux CoredWire

Heat-resistant Steel CO2 Gas Shield

E81T1-K2C

0.15

0.5-1.75

0.8

0.15

1.0-2.0

0.35

0.03

0.03

0.05

-

-

Low-temperature Steel
CO2 Gas Shield

E81T1-Ni1C

0.12

1.5

0.8

0.15

0.8-1.1

0.35

0.03

0.03

0.05

-

-

E91T1-Ni2C

0.12

1.5

0.8

-

1.75-2.75

-

0.03

0.03

-

-

-

Weathering Steel CO2 Gas Shield

E81T1-W2C

0.12

0.5-1.3

0.35-0.8

0.45-0.7

0.4-0.8

-

0.03

0.03

-

0.3-0.75

-

High-strength Steel CO2 Gas Shield

E101T1-K3C

0.15

0.75-2.25

0.8

0.15

1.25-2.60

0.25-0.65

0.03

0.03

0.05

-

-

Nickel-based Alloy Flux Cored Wire

Mixed Gas Shield

ENiCrMo3T0-4

0.1

0.5

0.5

20-23

≥58

8.0-10.0

0.02

0.15

-

-

5

ENiCrMo4T0-4

0.02

1

0.5

14.5-16.5

Rem

15.0-17.0

0.03

0.03

-

-

4.0-7.0

ENiCrMo10T0-4

0.02

1

0.5

20.0-22.5

Rem

12.5-14.5

0.03

0.015

0.35

0.5

2.0-6.0

Flux Cored Wire15

Flux cored wire is a very widely used welding process. It is widely used in the welding of low carbon steel, low alloy steel and other alloy materials in heavy manufacturing, construction, shipbuilding, offshore facilities and other industries.


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