Three Phase Traction Transformer - The "Heart" of Electrified Railway
Product Description
Traction transformers are special transformers used in electrified railways to provide electric energy for electric locomotives or EMUs, and are core equipment in the traction power supply system. Their core function is to convert the high voltage of the public power grid (such as 110kV, 220kV) into a low voltage suitable for electric locomotives (such as 25kV single-phase AC) and ensure the reliability and safety of power supply.Based on ordinary power transformers, they are deeply customized for the extreme working conditions and special needs of electrified railways.
Features for Three Phase Traction Transformer
Super strong impact resistance
Frequent overload: When the electric locomotive starts and accelerates, the current can reach 2-3 times the rated value. The traction transformer needs to withstand short-term high-speed operation overload without damage.
Short-circuit tolerance: When the contact network short-circuit fault occurs (such as foreign body overlap), it needs to withstand a short-circuit current of more than 10kA for more than 2 seconds, which is far beyond the standard of ordinary transformers.
Voltage level and wiring characteristics
High voltage side: directly connected to the power grid (such as 220kV), single-phase 25kV output on the low voltage side, three-phase-single-phase conversion must be achieved through V/V wiring or Scott wiring to avoid three-phase imbalance in the power grid.
Harmonic suppression: The locomotive rectifier generates 3rd and 5th harmonics, and the transformer winding adopts phase shifting technology or filter winding.
Extreme environment adaptability
Environmental range:-40ºC to +45ºC wide temperature operation, and anticoagulant needs to be added to the insulating oil.
Anti-fouling design: external insulation creepage distance ≥31mm/kV, suitable for heavily polluted areas such as deserts and coastal areas.
High reliability redundant design
Backup cooling system: when the main cooler fails, the backup oil pump automatically starts.
Online monitoring: built-in optical fiber temperature measurement, partial discharge sensor, real-time warning.
Compact and lightweight
Shell structure: compared with ordinary core transformers, the volume is reduced by 30%.
Aluminum winding replaces copper: 15% weight reduction, but the aluminum welding process problem needs to be solved.
Long maintenance cycle
Fully sealed oil tank: nitrogen protection is used to achieve 10 years of maintenance-free (ordinary transformers need to be inspected once every 5 years).
Transformer case comparison
| Parameters |
Traction transformer (China high-speed rail) |
Ordinary Distribution transformer |
| Overload capacity |
200% / 10 minutes |
150% / 1 minute |
| Short-circuit impedance |
10%-12% (fault current suppression) |
4%-6% |
| Insulation grade |
Class H (180ºC) |
Class F (155ºC) |
| Annual operating hours |
8700 hours (almost uninterrupted) |
5000 hours |
Pearl Electric, an experienced transformer manufacturer since 1958, design and produce various cast resin dry type transformer for different application include rectification transformer, marine/offshore oil platform transformer, rectification traction transformer, Transformer for electrified railway station, Rectification excitation transformer etc.
Technical Datasheet for Cast Resin Dry Type Transformer
| Items |
Item |
| Origin |
China |
| Manufacturer |
Pearl Electric Co., Ltd. |
| Brand |
Pearl Electric |
| Production Descriptions |
Three Phase Electrical Power Dual Voltage Traction Transformer |
| Reference standards |
IEC 60076-11 |
| Capacity |
3300kVA |
| Frequency |
60 / 50Hz |
| Voltage (HV) |
33KV or customized |
| Voltage (LV) |
0.4KV or customized |
| Impedance |
4%-6% |
| Connections (Vector Group) |
Dyn11 |
| Tapping Range |
+ 2 x 2.5% , - 2 x 2.5% |
| Core materials |
Silicon Steel |
| Winding materials |
Aluminum or copper |
| Lightning Impulse Withstand Voltage |
IEC standard |
| AC withstand voltage |
IEC standard |
| Temperature Rise class |
H-class |
| Temperature Rise |
125K |
| Cooling method |
AN/AF |
Certifications
Product Line
Company Profile
Pearl Electric, located in Guangzhou, China, was founded in 1958 and is an outstanding power equipment supplier in the transmission and distribution industry. With a land area of 100000 square meters, over 600 employees, and an annual turnover of over USD 142 million, we currently have over 200000 transformers in operation, which have been sold to Southeast Asia, Central Asia, Africa, Europe, North America and other regions.
Pearl Electric is devoted to providing safe, highly efficient and intelligent power transformation and distribution solution, focusing on R&D, manufacturing, sales and service as below:
FAQ
FAQ:
1.Q: Are you manufacturer?
A: Yes, we are manufacturer. Our factory is in Guangzhou City, Guangdong Province.
2.Q: Do you have any Certificate?
A: Yes. Our transformer has awarded CE, UL, KEMA certificate. If you need any other Certificate, we can help you to apply it.
3.Q: How can I pay you?
A: Pay by T/T and L/C is acceptable.
4.Q: What about the production?
A: In general, it take 4~6weeks and it depend on the different style.
5. Q:How contact us to get quick inquiry ? Follow us in our company website.
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