What Is a Traction Transformer?
Quick answer — A traction transformer supplies railway traction systems, either on-board the locomotive (an auxiliary and sometimes traction transformer) or in the trackside substation that steps the grid voltage down to the catenary voltage (e.g. 25 kV, 15 kV or 750 V DC). It must handle vibration, frequent load cycles, reduced space and fire-safe requirements, and be robust in a demanding environment.
What is a traction transformer and why is it different?
Trackside vs on-board
Trackside traction transformers convert the utility voltage to the catenary voltage at the substation; on-board transformers (on rail vehicles) supply the drives and auxiliary loads and are subject to severe vibration and space limits.
Design demands
They need a ruggedised construction for vibration, dust and temperature; often dry-type or ester-filled for fire safety; and they handle high, rapidly varying loads with frequent starts and stops.
Standards
Rail projects add specific traction and fire-safety requirements in addition to the IEC/utility rules and the local grid interface.
References & standards
- IEC 60076-1
- Rail traction standards
Related
Related manufacturers
Prolec GE (GE Vernova) · Prolec GE Waukesha · Hitachi Energy USA · Siemens Energy · Eaton · Virginia Transformer Corp
Related components
Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
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