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Substation Engineering Case Studies: Design, Protection & System Studies

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May 3, 2025 | Blog

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Below are four flagship projects where Keentel Engineering delivered end-to-end substation design (primary, secondary) and comprehensive power system studies to ensure safe, reliable, and standards-compliant installations.

345 kV EHV Greenfield Substation

Project Scope

Design and build of a new 345 kV / 138 kV transmission substation to integrate 400 MW of wind generation into the regional grid.

Primary Design Services

  • Full primary layout (GA) drawings with major equipment placement and conductor routing
  • Transformer, breaker, disconnect switch, CT/VT, and wave-trap specifications
  • 4 000 A tubular aluminum rigid bus design
  • IEEE Std 80™ grounding grid analysis using CDEGS

Secondary Design Services

  • Protection & control single-line diagrams and wiring schematics
  • AC/DC auxiliary systems with IEEE Std 485™ battery sizing
  • RTU/SCADA integration: point mapping and telemetry configuration

Power System Studies

  • Short-circuit (IEEE C37.010)
  • Load flow & reactive power planning
  • Protection coordination (SEL-411L, SEL-351, SEL-487E)
  • Arc-flash hazard analysis (IEEE 1584-2018)
  • Ground grid step/touch voltage assessment

Key Deliverables & Impact

  • 150+ IFC drawing sets & equipment BOM
  • PE-sealed engineering certification in multiple states
  • Successful substation energization with zero safety incidents
  • “Proactive RFI responses” earned ongoing preferred-partner status

230 kV GIS Substation Expansion

Project Scope

Expansion and modernization of an existing 230 kV gas-insulated substation, adding two new feeders and upgrading legacy protection.

Primary Design Services

  • 3D CAD-based GIS bay layout modifications
  • New feeder bay and duct-bank routing
  • Civil coordination for control building enlargement

Secondary Design Services

  • IEC 61850 digital protection scheme design
  • Microprocessor relay replacements (SEL/GE)
  • Digital fault recorder (DFR) installation and disturbance monitoring

Power System Studies

  • Breaker duty analysis
  • Relay coordination & selectivity for transmission line protection
  • Transient stability (NERC TPL)
  • EMTP modeling for breaker TRV assessment

Key Deliverables & Impact

  • Updated one-line, three-line, and P&C schematics
  • Comprehensive settings database
  • Arc-flash labeling across new and retrofitted equipment
  • Expansion completed without any substation outage, earning additional retrofit work

115 kV / 34.5 kV Collector Substation (BESS)

Project Scope

EPC-level design for a 100 MW / 400 MWh battery energy storage collector substation tying into a 115 kV network.

Primary Design Services

  • Space-optimized layout under site constraints
  • Single-bus configuration with future breaker-and-a-half provision
  • 75–125 MVA transformer with on-load tap changer

Secondary Design Services

  • Transformer differential (87T) and bus protection (87B) schemes
  • BMS integration for trip signaling
  • Dual-fiber protection & redundant SCADA architecture

Power System Studies

  • Load flow for capacitor bank optimization
  • Fault analysis including BESS short-circuit contribution
  • Harmonic study for IBR interactions
  • EMT switching transient analysis for inverter protection

Key Deliverables & Impact

  • IFC drawings & FAT support docs
  • Detailed commissioning & relay-setting plans
  • First large-scale BESS substation for the client, delivered in under 12 months
  • Performance exceeded interconnection guarantees

500 kV Bulk Power Substation

Project Scope

Greenfield design of a 500 kV / 230 kV bulk substation on a major interregional corridor, enhancing transfer capability by 1 200 MW.

Primary Design Services

  • Breaker-and-a-half arrangement
  • 500 kV gas circuit breaker & disconnect switch specifications
  • High-ampacity rigid/strain bus with seismic considerations

Secondary Design Services

  • High-speed fiber-based bus differential protection
  • Line differential & distance protection coordination
  • N-1/N-2 redundant protection zoning

Power System Studies

  • Interconnection SIS modeling
  • EMT study for breaker restrike/TRV risks
  • GIC impact assessment (NERC TPL-007)
  • NERC TPL reliability assessment

Key Deliverables & Impact

  • 400+ page Engineering Study Report & IFC drawings
  • FAT/SAT checklists, commissioning manuals, and staff training
  • Early energization ahead of compliance deadlines, securing client recognition

Why Clients Choose Keentel Engineering

  • Integrated Primary & Secondary Design under one roof
  • Advanced Modeling & Studies: PSSE, PSCAD, EMTP, CDEGS
  • NERC & IEEE Expertise: PRC, TPL, 1584, 80, 485, 2800 compliance
  • First-Time ISO Acceptance with minimal RFIs
  • Repeat Business driven by reliability, responsiveness, and precision

Ready for Your Next Substation Project?

Explore our Electrical Substation Design Services and partner with Keentel Engineering to deliver turnkey, standards-compliant substations—on time and on budget.

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About the Author:

Sonny Patel P.E. EC

IEEE Senior Member

In 1995, Sandip (Sonny) R. Patel earned his Electrical Engineering degree from the University of Illinois, specializing in Electrical Engineering . But degrees don’t build legacies—action does. For three decades, he’s been shaping the future of engineering, not just as a licensed Professional Engineer across multiple states (Florida, California, New York, West Virginia, and Minnesota), but as a doer. A builder. A leader. Not just an engineer. A Licensed Electrical Contractor in Florida with an Unlimited EC license. Not just an executive. The founder and CEO of KEENTEL LLC—where expertise meets execution. Three decades. Multiple states. Endless impact.

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Let's Discuss Your Project

Let's book a call to discuss your electrical engineering project that we can help you with.

Man in a blazer and open shirt, looking at the camera, against a blurred background.

About the Author:

Sonny Patel P.E. EC

IEEE Senior Member

In 1995, Sandip (Sonny) R. Patel earned his Electrical Engineering degree from the University of Illinois, specializing in Electrical Engineering . But degrees don’t build legacies—action does. For three decades, he’s been shaping the future of engineering, not just as a licensed Professional Engineer across multiple states (Florida, California, New York, West Virginia, and Minnesota), but as a doer. A builder. A leader. Not just an engineer. A Licensed Electrical Contractor in Florida with an Unlimited EC license. Not just an executive. The founder and CEO of KEENTEL LLC—where expertise meets execution. Three decades. Multiple states. Endless impact.

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