Service — Electrical Design
Precision
Design
for Critical
Infrastructure
From substations to data centers — comprehensive electrical designs from preliminary concept to execution-ready detailed drawings.
400kV
Max voltage level
4
Design phases
IEC / IEEE
Standards
Our Capability
HV/MV electrical design for critical infrastructure — from 400kV transmission substations to low voltage IT distribution.
Our expertise covers conceptual design, single-line diagrams, redundancy architecture (N+1, 2N, 2(N+1)), and detailed protection system design. We cover the entire design lifecycle — from preliminary concepts to execution-ready detailed designs.
Powered by
Power System Analysis
Engineering Documentation
IEC 61850 IntegrationProcess
Four phases. One complete system.
Phase 01
Preliminary Design
The foundation of every successful project begins with a clear vision. Our preliminary designs outline key concepts, system requirements, and feasibility, setting the stage for optimized solutions.
- Conceptual Schematics
- Load Flow and Short Circuit Study Estimates
- Preliminary Equipment Layouts
Phase 02
Basic Design
We develop essential designs that bridge concepts to actionable plans. Basic designs ensure compliance with project requirements and standards.
- Power System Layouts
- Protection & Control Concept Designs
- High-Level Bill of Materials (BoM)
- Load Flow and Fault Analysis
Phase 03
Main Design
Our main design phase focuses on detailed technical solutions, ensuring compatibility, safety, and future scalability for mission-critical systems.
- Single-Line Diagrams (SLDs)
- Protection Coordination Studies
- Cable Routing and System Architecture Plans
- Grid Connection Design for Substations
Phase 04
Detailed Design
The final execution-ready designs provide every detail required for installation, testing, and commissioning, ensuring seamless project implementation.
- Detailed Protection and Control Schematics
- Final Load Flow and Short Circuit Reports
- Equipment and Cable Sizing
- SCADA and Communication Integration Plans
Analysis
Advanced Electrical Studies
Load Flow Analysis
Ensuring systems meet operational and energy efficiency requirements through comprehensive power flow studies.
Short Circuit Studies
Validating system stability and fault-handling capabilities with IEC & IEEE calculations.
Protection Coordination
Designing coordinated protection schemes for relays and breakers across all voltage levels.
Arc Flash Studies
Ensuring personnel and system safety in high-energy environments per IEEE 1584.
Industry-Leading Analysis Platform
Powered
by ETAP
The world's most comprehensive electrical power system analysis software — delivering accurate studies and ensuring your systems meet the highest safety and performance standards.
Core Analysis Capabilities
Load Flow Analysis
Comprehensive power flow studies for system optimization
Short Circuit Analysis
IEC & ANSI/IEEE fault current calculations
Protection Coordination
Time-current curve coordination and relay settings
Arc Flash Analysis
IEEE 1584 compliant incident energy calculations
ETAP is used by thousands of engineers worldwide for power system modeling, analysis, optimization, and predictive analytics.
Additional Capabilities
- Real-time power system simulation
- Model-driven intelligent design
- Transient stability analysis
- Harmonic analysis and filter design
- Motor starting studies
- Cable sizing and ampacity calculations
BIM-Based Substation Design Platform
Powered
by primtech
primtech by entegra is an intelligent, BIM-based suite for substation design and engineering — building a fully data-rich 3D model that digitalizes the entire lifecycle from concept to digital twin.
Core Design Capabilities
3D Substation Design
BIM-compliant authoring from single-line diagrams through to full physical layout.
Digital Twin & VR
Virtual reality and digital twin visualization of the complete substation.
Data Integration
Connectors that link engineering data across systems and disciplines.
Lifecycle Data
A consistent data backbone spanning the full substation lifecycle.
A model-driven platform that keeps engineering data consistent and traceable across every discipline and project phase.
Additional Capabilities
- Standardized equipment libraries
- Automated bills of material
- Digital inventory services
- 3D clash detection and validation
Documentation Platform
Engineering
Base
Our engineering documentation is created using Aucotec Engineering Base — a database-driven platform that ensures consistency, traceability, and quality across all project deliverables.
Schematic Design
Single-line diagrams, circuit schematics, and control wiring
Central Database
Single source of truth for all engineering data
Multi-User Collaboration
Real-time concurrent engineering across teams
Revision Control
Full version history and change tracking
Documentation Deliverables
BIM Design & Engineering
Designed in 3D,
coordinated by data
We design in a BIM environment — every drawing, schedule, and layout derives from a single coordinated 3D model. Revit and primtech author the model, AutoCAD delivers precise 2D documentation, and Engineering Base keeps the data consistent.
Coordinated 3D Models
Electrical, structural, and MEP modeled together to eliminate clashes before site.
Data-Rich Components
Every object carries its engineering data — ratings, references, and revisions.
Single Source of Truth
Drawings, schedules, and BOMs generate from one model, always in sync.
Lifecycle Handover
A digital twin handed over for operations, maintenance, and future works.
Get in touch
Let's talk
about your project.
Our team of experts is ready to help with your data center and substation commissioning needs.
- Phone
- +385 (1) 3815 145
- info@terrawatt.eu
- Office
- Radnička cesta 1A, Business park 1A, 10000 Zagreb, Croatia