Sonu Sonu

• Post-service engineering experience in erection, testing, commissioning, troubleshooting, and
on-site rectification of distribution dry-type transformers across multiple organizations and
projects.
• Hands-on involvement in installation and commissioning of dry-type transformers at diverse
locations including data centres, rural electrification projects, commercial buildings, railway
installations, metro stations, and small commercial facilities.
• Executed pre-commissioning and commissioning tests such as insulation resistance (IR), polarity
checks, voltage ratio verification, winding resistance measurements, and functional checks prior
to energization.
• Performed fault diagnosis and corrective maintenance for issues related to overheating, abnormal
noise, insulation deterioration, loose connections, unbalanced loading, and protection interlocks.
• Coordinated on-site activities with clients, consultants, EPC contractors, and utility authorities to
ensure compliance with technical specifications and safety standards.
• Ensured strict adherence to electrical safety procedures, statutory regulations, and OEM
guidelines during installation, energization, and maintenance activities.
• Supported commissioning in mission-critical environments such as data centres, ensuring minimal
downtime and high system reliability.
• Prepared technical documentation including commissioning reports, test records, and handover
documents for client acceptance.
• Handled end-to-end commissioning, site testing, documentation, and timely issue closure for
locomotive and EMU transformers in railway traction projects.
• Commissioned 6500 kVA LOT locomotive transformers for WAG-9, 7770 kVA traction transformers,
and EMU transformers for passenger trains, ensuring compliance with RDSO/OEM standards.
• Achieved on-time commissioning within project timelines by effective planning, coordination, and
rapid fault resolution at site.
• Carried out on-site rectification of minor issues including oil leakage arresting, replacement of small
protection components, tightening of fittings, and correction of wiring defects.
• Performed site testing and functional verification of transformer protection and auxiliaries before
energization.
• Coordinated with OEMs, railway authorities, and site teams to resolve technical observations and close
punch points efficiently. approval.

• Executed overhauling, erection, testing, and commissioning of power transformers for railway
traction, hydro, thermal, and nuclear power projects, ensuring compliance with approved
drawings and OEM guidelines.
• Supervised core & coil assembly, tanking, vacuum drying, oil filling, and filtration to achieve
moisture-free and reliable insulation systems.
• Conducted pre-commissioning and commissioning tests, including IR, PI, winding resistance,
ratio, vector group, magnetizing current, capacitance & tan-delta, BDV, and OLTC functional tests.
• Performed transformer oil testing (BDV, DGA, moisture content) and ensured oil quality as per
IS/IEC standards.
• Handled Low voltage testing at site and ensured safe energization of transformers.
• Diagnosed and rectified transformer faults such as overheating, oil leakage, phase imbalance,
abnormal noise, protection relay operations, and OLTC malfunctions.
• Coordinated with OEMs, utility engineers, consultants, and inspectors during commissioning
and final acceptance testing.
• Ensured proper integration of transformers with protection systems including Differential, REF,
Buchholz relay, WTI/OTI, and Pressure Relief Devices (PRD).
• Maintained strict adherence to electrical safety procedures, railway safety regulations, and
nuclear safety protocols.
• Prepared and maintained commissioning reports, test records, as-built documentation, and
final handover dossiers.