CTR manufactures On-Load Tap Changers (OLTCs) for railway traction transformers and traction substations, ensuring stable voltage regulation during continuous train operations. Our OLTCs are manufactured in accordance with IEC 60214 and IS 8468 standards and are backed by decades of field experience across Indian Railways, metro networks and industrial power systems.
Traction transformers run through constant load cycling as trains accelerate, brake and idle. Our OLTCs are designed for this kind of repetitive switching, with a diverter switch and tap selector built to sustain over high operation counts without losing contact performance.
Every tapchanger comes from a design lineage tested and refined over decades, first through our English Electric, UK collaboration for flange-mounted units, then through ELIN OLTC GmbH for in-tank designs. That heritage shows up in maintenance intervals that work with railway shutdown schedules, not against them.
CTR OLTCs are trusted by transformer manufacturers, railways, power utilities and industrial customers across India and overseas. Our OCTC are suitable for traction substations, metro rail systems, dedicated freight corridors and railway electrification projects where continuous voltage regulation and high operational reliability are essential.
Our OLTC for railways is designed for transformer’s electrical duty. The parameters below define the working range we build within.
| Parameter | Specification |
|---|---|
| Application | Railway Traction Transformers |
| Railway System Voltage | 25 kV AC Electrification |
| Installation Type | In-Tank / Flange Mounted |
| Step Voltage | Defined by regulation requirement |
| Standards | IEC 60214, IS 8468 |
We design voltage class, rated through-current, step voltage and total tapping positions to match your traction transformer’s specification. Ratings are engineered around the transformer’s duty, not a single fixed class, so tell us your requirement and we’ll confirm the build.
From the tap selector to the drive mechanism, every subsystem is built for a long service life under continuous switching.
Rated for extended maintenance intervals under continuous switching cycles.
Position indication and remote control interface as standard.
Optional Remote Tapchanger Control Cubicle and Electronic Control Unit for remote monitoring.
Available for oil-immersed units — extends oil life between servicing.
Customise tap count and rating without a ground-up redesign.
Automatic Voltage Control Regulator available for automated voltage regulation.
Every OLTC is type tested before it ships, with full documentation for traceability.
Mounting guidance and commissioning assistance aligned with your traction transformer program.
Scheduled inspection and contact assessment services aligned to your fleet or substation maintenance cycles.
Genuine spares and technical service backed by our manufacturing base at Pune, Aurangabad and Nashik, supported by a 600-plus strong engineering team.
Share your transformer rating, voltage class, tap range, mounting arrangement and operating conditions. Our engineering team will recommend the most suitable OCTC traction transformer build with full technical documentation.