Mechanical Design Engineer Power Transformers

General Arrangement Drawings, Core-and-Coil Assemblies, AutoCAD & Autodesk Inventor 3D

Department: Engineering Power Transformer Design

Position: Mechanical Design Engineer Power Transformers

Reports To: Senior Engineering Manager Power Transformer Design

Technical Guidance: Senior Mechanical Design Expert

Location: [Manufacturing Plant Location]

Product Range: Oil-Immersed Power Transformers up to 250 MVA, 230 kV Class

Employment Type: Full-Time

1. Position Summary

We are seeking an experienced and detail-oriented Mechanical Design Engineer to develop mechanical designs, general arrangement drawings, internal core-and-coil assembly drawings, and manufacturing documentation for large oil-immersed power transformers.

The successful candidate will be responsible for preparing accurate 2D drawings and 3D models using AutoCAD and Autodesk Inventor, ensuring that all mechanical designs meet customer specifications, electrical design requirements, manufacturing capabilities, and applicable engineering standards.

The role requires practical knowledge of power transformer construction, including transformer tanks, core-and-coil assemblies, clamping structures, internal supports, high-voltage bushings, radiators, conservators, piping, and accessories.

The Mechanical Design Engineer will coordinate closely with electrical, dielectric, thermal, manufacturing, and testing teams to develop mechanically sound, manufacturable, and cost-effective transformer designs.

The primary objective is to deliver accurate, complete, and production-ready mechanical drawings and 3D assemblies that support effective manufacturing, reliable transformer performance, and timely project execution.

2. Key Responsibilities

A. Transformer General Arrangement (Outline) Drawings

Responsible for preparing complete transformer general arrangement and customer outline drawings.

Key responsibilities include

- Develop transformer general arrangement drawings using AutoCAD and Autodesk Inventor.
- Prepare front, side, top, and sectional views of complete transformer assemblies.
- Establish overall transformer dimensions and equipment layout.
- Prepare bushing arrangements, phase spacing, and terminal orientation drawings.
- Develop radiator, cooler, conservator, and accessory layouts.
- Position valves, pressure relief devices, gauges, marshalling cabinets, control cabinets, and other external components.
- Prepare lifting, jacking, pulling, and anchoring arrangements.
- Establish transportation dimensions, operating clearances, and maintenance access requirements.
- Calculate and document approximate overall weights, oil volumes, and center-of-gravity locations using validated design data.
- Incorporate customer comments and approved drawing revisions.
- Ensure general arrangement drawings comply with customer specifications and approved design requirements.

B. Internal Core-and-Coil Assembly Design Responsible for detailed mechanical modeling and drawing development of transformer active-part assemblies.

Key responsibilities include

- Develop 3D models and 2D assembly drawings of transformer core-and-coil structures.
- Prepare core clamping frame, yoke beam, tie rod, and supporting structure drawings.
- Develop winding mounting and positioning arrangements.
- Prepare top and bottom clamping assembly drawings.
- Model pressure rings, clamping plates, support blocks, and associated mechanical components.
- Develop internal lead support and mounting arrangements.
- Prepare active-part lifting and handling arrangements.
- Ensure proper mechanical clearances between windings, core structures, leads, and tank components.
- Coordinate with electrical and dielectric engineers to incorporate required insulation dimensions and electrical clearances.
- Prepare exploded assembly views and detailed component drawings.
- Develop assembly documentation to support core-and-coil manufacturing and final assembly.

C. Transformer Tank and Cover Design

- Prepare transformer tank and cover 3D models and detailed fabrication drawings.
- Develop tank wall, base, stiffener, flange, and cover arrangements.
- Model bushing turrets, manholes, inspection openings, and mounting structures.




- Prepare radiator and cooler mounting arrangements.
- Develop conservator supports, brackets, and accessory mounting structures.
- Prepare tank welding and fabrication details.
- Incorporate specified vacuum, pressure, lifting, transportation, and seismic design requirements provided or approved by the responsible specialists.
- Coordinate tank dimensions with internal active-part assembly requirements.
- Support design optimization for fabrication efficiency and material utilization.

D. Internal Mechanical Components and Supports

- Prepare detailed drawings of internal lead supports and clamping brackets.
- Model pressboard support structures and mechanical insulation components.
- Develop internal piping and oil-flow arrangements.
- Prepare tap changer mounting and support structures.
- Model current transformer mounting arrangements where applicable.
- Ensure compatibility between internal mechanical components and electrical insulation requirements.
- Coordinate with thermal engineers to incorporate oil circulation and cooling requirements.
- Support mechanical assembly standardization.

E. External Accessories and Equipment Layout

- Prepare detailed arrangements for bushings, radiators, conservators, and cooling equipment.
- Model piping, valves, flanges, and connections.
- Prepare mounting arrangements for pumps, fans, oil-flow indicators, and other cooling accessories.
- Develop layouts for control cabinets, marshalling boxes, and monitoring devices.
- Ensure accessibility for maintenance, inspection, and operation.
- Verify dimensional compatibility of purchased components using approved vendor drawings.
- Coordinate external accessory placement with customer requirements and transportation limitations.

F. AutoCAD and Autodesk Inventor 3D Modeling The candidate must be proficient in AutoCAD and Autodesk Inventor.

Key responsibilities include

- Develop accurate 2D mechanical drawings using AutoCAD.
- Create parametric 3D part models and assemblies using Autodesk Inventor.
- Develop complete transformer 3D assembly models.
- Generate manufacturing drawings from approved 3D models.
- Prepare detailed section views, exploded views, and assembly drawings.
- Maintain consistent modeling practices, part numbering, and drawing standards.
- Perform interference and clearance checks within 3D assemblies.
- Manage design revisions and engineering change documentation.
- Develop reusable standard parts, drawing templates, and component libraries.
- Support digital design standardization and engineering productivity improvements.

G. Manufacturing Drawings and Bills of Materials

- Prepare detailed fabrication and assembly drawings.
- Develop mechanical bills of materials for tanks, clamping assemblies, supports, and accessories.
- Specify materials, dimensions, tolerances, and manufacturing requirements.
- Prepare cutting, machining, welding, and assembly details.
- Coordinate drawing requirements with production and procurement teams.
- Review supplier drawings and incorporate approved dimensions.
- Ensure drawing accuracy and completeness before release.
- Maintain drawing revision control and engineering documentation records.

H. Mechanical Design Verification and Quality

- Perform dimensional and interference checks on mechanical designs.
- Verify fit-up between core-and-coil assemblies and transformer tanks.
- Review mechanical tolerances and assembly clearances.
- Support structural design calculations under the guidance of senior mechanical specialists.
- Incorporate approved requirements for vacuum, pressure, lifting, and transportation loads.
- Participate in design reviews and manufacturing readiness assessments.
- Investigate drawing errors and mechanical assembly deviations.
- Implement corrective actions and drawing improvements.
- Ensure compliance with applicable company design procedures and customer specifications.

I.



Manufacturing and Shop-Floor Support

- Provide technical support to tank fabrication, core-and-coil assembly, and final transformer assembly teams.
- Resolve drawing interpretation and dimensional fit-up issues.
- Support first-article manufacturing and new product introduction.
- Review fabrication and assembly deviations.
- Coordinate approved design modifications with manufacturing.
- Participate in root-cause investigations of mechanical assembly problems.
- Improve drawings based on manufacturing feedback and lessons learned.
- Support continuous improvement of mechanical design and production processes.

J. Cross-Functional Engineering Coordination

- Work with electrical design engineers to incorporate winding and core dimensions.
- Coordinate with dielectric engineers on insulation clearances and lead arrangements.
- Work with thermal engineers on oil ducts, cooling equipment, and piping layouts.
- Collaborate with mechanical short-circuit specialists on clamping and support requirements.
- Coordinate with procurement on material specifications and vendor component drawings.
- Support project engineering and customer drawing approval processes.
- Report design progress, technical issues, and engineering risks to the Senior Engineering Manager.

3. Required Qualifications

Education

- Bachelor's degree in Mechanical Engineering preferred.
- Mechanical Engineering Technology or a closely related qualification may be considered with strong relevant experience.

Professional Experience

- Minimum 37 years of mechanical design experience, preferably in power transformer manufacturing.
- Experience preparing transformer general arrangement drawings and mechanical assembly drawings.
- Practical experience with AutoCAD 2D and Autodesk Inventor 3D.
- Experience in tank fabrication, structural steel assemblies, or heavy electrical equipment is preferred.
- Familiarity with transformer core-and-coil construction is strongly preferred.
- Experience preparing manufacturing drawings, assembly drawings, and bills of materials.
- Experience supporting fabrication and shop-floor assembly operations.

Candidates with strong mechanical CAD and heavy electrical equipment design experience may be considered if they demonstrate the ability to learn transformer-specific construction requirements. 4. Essential Technical Competencies

Mechanical Design

- Transformer general arrangement drawings.
- Core-and-coil assembly layouts.
- Tank and cover fabrication drawings.
- Clamping frames and mechanical supports.
- Internal and external accessory arrangements.

CAD Software

- Advanced proficiency in AutoCAD 2D.
- Strong proficiency in Autodesk Inventor 3D.
- Parametric part modeling and large assembly modeling.
- Drawing generation from 3D models.
- Interference and clearance verification.
- Autodesk Vault or equivalent PDM experience preferred.

Manufacturing Knowledge

- Steel fabrication and welding.
- Machining and dimensional tolerances.
- Mechanical assembly processes.
- Material selection.
- Fabrication and assembly drawings.
- Engineering bills of materials.

Engineering Fundamentals

- Engineering mechanics.
- Strength of materials.
- Mechanical tolerances and fits.
- Basic structural design principles.
- Geometric dimensioning and tolerancing.
- Understanding of lifting and transportation requirements.

Standards

- Familiarity with applicable IEEE C57 transformer requirements.
- Knowledge of ASME Y14.5 or equivalent drawing and dimensioning standards.
- Familiarity with AWS welding requirements and ASTM material specifications.
- Ability to interpret customer mechanical specifications and manufacturing requirements.

5. Professional Competencies

- Strong attention to detail and drawing accuracy.
- Good spatial visualization and 3D modeling ability.
- Practical understanding of fabrication and assembly processes.
- Ability to coordinate with multidisciplinary engineering teams.
- Strong problem-solving and troubleshooting skills.
- Ability to manage multiple drawing assignments and meet deadlines.
- Good technical communication and documentation skills.
- Willingness to work closely with manufacturing personnel.
- Commitment to engineering quality and continuous improvement.

📌 Mechanical Design Engineer - Power Transformer (Delhi)
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