Our engineering services for a High voltage AIS/GIS substation project are structured to deliver a fully integrated, standards-compliant, and technically robust solution. The scope includes:
Primary Engineering:
1. Work Breakdown Structure & Document Control
• Development of WBS aligned with project milestones
• Document numbering, revision control, and transmittal logs
• Sample Deliverable: Document Control Register (Excel/PDF)
2. Project Management & Resource Planning
• Engineering schedule aligned with procurement and construction
• Resource allocation matrix and progress tracking
• Sample Deliverable: Engineering Execution Plan (EEP)
3. Substation General & Equipment Layouts
• 2D/3D layout drawings for GIS hall, cable trenches, and auxiliary systems
• Equipment arrangement ensuring IEC 62271-203 clearance and maintenance access
• Sample Deliverables: General Arrangement Drawings (DWG/PDF), Equipment Layouts
4. Single Line Diagrams (SLDs)
• Detailed SLDs showing 220kV GIS bays, transformer connections, and auxiliary systems
• Integration with protection and control logic
• Sample Deliverable: 220kV SLD with bay numbering and interlocking logic
5. Bill of Quantities (BOQ) Extraction
• Material take-offs from approved drawings
• Categorized by equipment, cables, and civil works
• Sample Deliverable: BOQ in Excel with item codes and quantities
6. Equipment Data Evaluation
• Review of GIS, CTs, VTs, circuit breakers, and surge arresters against IEC 62271-203 and IEC 60044
• Compliance matrix and deviation reports
• Sample Deliverable: Equipment Technical Evaluation Report
7. Lightning Shielding Design & Analysis
• Rolling sphere method per IEEE Std 998
• Shielding mast and down conductor layout
• Sample Deliverable: Lightning Protection Study Report
8. CT/VT Sizing Calculations
• Based on protection and metering requirements
• Accuracy class, burden, and knee-point voltage analysis
• Sample Deliverable: CT/VT Sizing Calculation Sheets
9. Battery Sizing & HVAC Load Calculations
• DC load profile and autonomy period per IEC 60896
• HVAC sizing for GIS hall and control room based on IEC 60068
• Sample Deliverables: Battery Sizing Report, HVAC Load Calculation Sheet
10. Civil Coordination
• Foundation loading data for GIS modules and cable trenches
• Interface drawings for embedded parts and earthing
• Sample Deliverable: Civil Interface Drawing Package
11. Cable Routing & Duct Bank Design
• Layouts for HV, MV, LV, and control cables
• Cross-section details and separation requirements
• Sample Deliverables: Cable Routing Plans, Duct Bank Sections
12. Vendor Coordination & Engineering Integration
• Technical meetings, interface matrix, and design freeze coordination
• Integration of OEM drawings into master design set
• Sample Deliverable: Vendor Interface Matrix
Referenced Standards
• IEC 62271-203 – GIS for rated voltages above 52kV
• IEC 62271-100 – High-voltage AC circuit breakers
• IEC 60044 / IEC 61869 – Instrument transformers
• IEEE Std 998 – Lightning protection for substations
• IEC 60896 – Stationary lead-acid batteries
• IEC 60068 – Environmental testing for HVAC design
• IS 1893 – Seismic design considerations (for Zone IV compliance)
Secondary Engineering - Protection and Station Automation:
Base-Energy offers advanced secondary engineering services through a team of seasoned professionals specializing in protection, control, and automation systems for high-voltage substations. Our scope is designed to ensure reliability, operational safety, and seamless integration of intelligent systems across all project phases.
Key Scope Elements:
• Protection & Metering Single Line Diagrams (SLDs) Development of comprehensive SLDs defining protection zones, metering points, and equipment interfaces across multiple voltage levels.
• Trip & Interlocking Logic Design Engineering of secure, fail-safe interlocking sequences, breaker control logic, and permissive schemes for isolators and transformers.
• Substation Metering, Alarm, & Tele-Information Plans Planning of real-time metering architecture, alarm annunciation schemes, and remote signaling to SCADA/master control stations, including analog and digital I/Os.
• Protection Schematics & Panel Drawings Design of detailed schematics Including development of fabrication-ready panel internal wiring, external interfaces and shop floor layout drawings for:
• Interface Engineering Signal exchange planning and detailed interface wiring between primary switchgear, GIS modules, control equipment, and third-party OEM systems.
• Wiring Tables & Terminal Plans Preparation of comprehensive wiring schedules, marshalling and terminal plans, ferrule coding, and cross-reference matrices for panel-shop and field teams.
• Protection Relay Setting Calculations & Coordination Studies Fault studies, short-circuit analysis, and graded protection strategies using software such as ETAP or DIgSILENT PowerFactory, with settings aligned to project-specific performance requirements and grid codes.
Sample Deliverables:
• Protection & Control Schematics (AutoCAD/EPLAN)
• Relay Setting Sheets & Coordination Reports
• Panel Wiring Diagrams & GA Drawings
• I/O List & Signal Mapping
• SCADA Point Lists & Protocol Assignments (IEC 61850, Modbus, etc.)
• FAT/SAT Checklists & As-Built Drawings
Applicable Standards & Guidelines:
• IEC 60255 – Measuring relays and protection equipment
• IEC 61850 – Substation communication and data modeling
• IEEE C37 Series – Protection and control standards for high-voltage equipment
• NTDC/WAPDA Specifications – For Pakistan-based projects
• IS/IEC 61000 – Electromagnetic compatibility in control systems
