EPC Engineering Support & Technical Services
Specialized high-voltage electrical, civil, and substation engineering support for prime contractors, project developers, and industrial infrastructure builders. Delivering rigorous ETAP simulations, physical layouts, protection coordination, and CEIG statutory compliance without requiring turnkey execution.
Bridging Complex High-Voltage Design & Regulatory Bottlenecks for Prime EPCs
General infrastructure contractors and balance-of-plant builders regularly win large multi-megawatt renewable, industrial, or transmission tenders. However, handling specialized 33kV to 400kV grid interconnections, complex numerical relay protection schemes, and Chief Electrical Inspector to Government (CEIG) regulatory vetting requires deep domain expertise that is difficult to maintain in-house.
Ultrathon Electric acts as an agile engineering back-office and technical partner. We take complete responsibility for your power systems simulations, detailed construction drawings, Bill of Quantities (BOQ), and vendor technical evaluations, allowing your project teams to focus on on-site procurement, civil execution, and client management.
Multi-Disciplinary Engineering Deliverables
Modular engineering deliverables tailored to your exact contractual scope:
Power System Studies (ETAP / PSCAD)
Short circuit (IEC 60909), load flow, arc flash calculations, motor acceleration, and transient stability.
Protection Relay Coordination & Settings
Time-Current Curves (TCC), differential 87T, distance 21, overcurrent 50/51, and tripping logic matrices.
Substation Physical Layouts (AIS & GIS)
General arrangement, statutory clearance profiles, busbar mechanical sizing, and control room architecture.
Civil & Structural Foundations (STAAD.Pro)
Transformer blast walls, plinths, gantry tower foundations, equipment support structures, and cable trenches.
Comprehensive Engineering Work Packages
Flexible, high-precision engineering services ready to integrate into your existing project organization.
ETAP Power System Studies
Accurate simulation of high-voltage networks under normal and contingency operations. Mitigating equipment overloading, identifying short-circuit stresses, and modeling harmonic distortion levels as per IEEE 519.
- • Short circuit to IEC 60909 / ANSI C37
- • Harmonic filter & APFC bank design
- • Arc flash hazard analysis (NFPA 70E)
Protection Coordination & Settings
Preventing nuisance tripping and ensuring fast fault clearance. We calculate setting files for ABB, Siemens, Schneider, and SEL numerical relays, generating complete relay coordination reports for utility sign-off.
- • Transformer Differential (87T) & REF (64R)
- • Feeder Overcurrent/Earth Fault (50/51, 50N/51N)
- • Line Distance (21) & Breaker Failure (50BF)
AIS & GIS Substation Layouts
Complete physical design from 33kV to 400kV. Detailed General Arrangement (GA) drawings, section elevations, phase-to-phase and phase-to-earth electrical clearances, and safety maintenance access corridors.
- • Flexible ACSR/AAAC busbar & rigid tube sizing
- • Gas-Insulated Switchgear (GIS) indoor hall layout
- • Cable trench, duct bank & tray schedules
Earthing Grid (IEEE 80) & Shielding
Design of maintenance-free substation grounding grids to ensure touch and step voltages remain within safe physiological thresholds during high-voltage ground faults. Shield wire protection based on rolling sphere electrogeometric models.
- • Soil resistivity modeling (Wenner 4-pin test)
- • Mesh potential, touch & step voltage verification
- • Rolling sphere shielding calculations (IEEE 998)
Substation Civil & Structural Design
Structural modeling in STAAD.Pro for gantry towers, equipment mounting structures, and transformer plinths subjected to wind, seismic, and short-circuit electrodynamic forces. Oil soak pits and fire blast containment walls.
- • Transformer foundation with integrated oil containment
- • Gantry tower & equipment support steel designs
- • Control room architectural, HVAC & fire fighting
CEIG & Utility Statutory Dossiers
Complete engineering support for Chief Electrical Inspector to Government (CEIG) approvals and utility energisation clearances. We assemble single-line diagrams, clearance compliance certificates, and relay test reports.
- • CEA Safety Regulation compliance certification
- • SLDC/RLDC RTU telemetry & ABT metering packs
- • Pre-commissioning test protocol review & sign-off
5-Stage Engineering Collaboration Process
A predictable, rigorous engineering delivery process designed to align seamlessly with prime contractor schedules.
Design Basis Memorandum
Freezing grid connection codes, fault level limits, statutory clearances, customer specifications, and single-line architecture.
Simulations & Concepts
ETAP power system simulations, short-circuit calculations, initial general arrangement drawings, and earth grid preliminary sizing.
Detailed Engineering
Construction-ready layouts, sections, civil foundation designs, cable schedules, schematic wiring diagrams, and procurement BOQs.
Vendor Drawing Reviews
Thorough review of Guaranteed Technical Particulars (GTP) and vendor drawings for transformers, breakers, CT/PTs, and relays.
Statutory Dossier & As-Built
Assembly of CEIG approval dossiers, testing support during pre-commissioning, and final as-built drawing handover.
Frequently Asked Questions: EPC Engineering Support
Common questions regarding collaboration models, software platforms, and deliverable handoffs.
Explore Other Engineering Disciplines
Partner with Our Power Engineering Desk
Discuss your upcoming project tender, substation design package, or power systems simulation requirements with our engineering directors.