Service — Commissioning
Commissioning That
Ensures Reliability,
Efficiency,
and Compliance
ASHRAE
Standard compliance
Tier I–IV
Uptime Institute levels
IEC / IEEE
Standards
Our Approach
We are the boots on the ground that verify your critical electrical infrastructure works as designed.
Our team of field engineers brings specialized test equipment to perform primary/secondary injection, protection relay programming, and full-load validation. We don't just oversee — we execute.
Standards We Work With
Hands-On Execution
Field Testing
& Execution
Our commissioning teams mobilize with advanced test equipment to perform the actual physical testing, programming, and verification of your critical infrastructure.
From injecting currents into protection relays to load banking generators and verifying UPS discharge curves — our engineers are hands-on in the field.
Capabilities
Our Commissioning Services
Protection Relay Testing
Secondary injection testing, logic verification, and programming of protection relays (SEL, GE, Siemens, ABB).
- Differential & Distance Protection
- Overcurrent & Earth Fault
- Teleprotection Schemes
- IEC 61850 GOOSE/MMS
UPS & Battery Systems
Comprehensive testing of Uninterruptible Power Supplies and battery banks, including discharge tests and IR scanning.
- Load Bank Testing
- Battery Discharge / Capacity
- Transient Response Analysis
- Harmonic Distortion Analysis
Generator & ATS Commissioning
Start-up, load banking, and step-load verification for backup generators and Automatic Transfer Switches.
- 100% Load Banking
- Step Load Response
- Synchronization Verification
- ATS Logic & Transition
MV Switchgear & Cables
Comprehensive testing of Medium Voltage switchgear, vacuum breakers, and cabling. We ensure insulation integrity and mechanical operation.
- VLF & Tan Delta Cable Testing
- Breaker Timing & Motion Analysis
- Contact Resistance (Ductor)
- High Potential (Hipot) Testing
LV Switchgear & Circuit Breakers
Detailed commissioning of Low Voltage switchboards and breakers. We specialize in configuring and verifying modern digital trip units.
- Trip Unit Programming (Ekip, Etu, Micrologic)
- Secondary Injection Testing
- Primary Injection (High Current)
- ACB & MCCB Logic Verification
Commissioning Management
We oversee commissioning processes as a single point of accountability, ensuring milestones are met, risks are mitigated, and documentation aligns with project goals.
- End-to-End Commissioning Planning
- Risk Management and Issue Resolution
- Documentation Management and Compliance Reports
- Performance Metrics and System Optimization
Substation Commissioning
Our substation commissioning services ensure reliable grid performance, operational safety, and regulatory compliance.
- Protection and Control System Testing
- SCADA System Integration and Testing
- Load and Relay Validation
- Compliance with IEEE, IEC, and Local Grid Regulations
Process
Commissioning Process Workflow
Planning and Preparation
Scope definition, schedules, and documentation planning
Pre-Commissioning
Equipment checks, FATs, and subsystem testing
Functional Testing
Integrated testing, IST, and system validation
Final Handover
Reports, compliance certification, and operational readiness
Medium Voltage Commissioning
Specialized commissioning services for medium voltage electrical equipment in accordance with IEC 62271 series standards. Our comprehensive testing ensures safety, reliability, and compliance for switchgear, circuit breakers, and associated equipment.
Switchgear Testing (IEC 62271-200)
Comprehensive testing of medium voltage switchgear assemblies to ensure safe and reliable operation.
- Dielectric tests (power frequency and impulse)
- Temperature rise tests
- Short-circuit withstand tests
- Mechanical operation tests
- Protection degree verification (IP rating)
- Internal arc classification tests (IAC)
Circuit Breaker Testing (IEC 62271-100)
Detailed testing of medium voltage circuit breakers for optimal performance and safety compliance.
- Mechanical endurance tests
- Electrical endurance tests
- Short-circuit making and breaking tests
- Load switching tests
- Capacitive current switching tests
- Operating mechanism tests
Disconnector & Earthing Switch Testing (IEC 62271-102)
Verification testing for disconnectors and earthing switches in medium voltage installations.
- Mechanical operation tests
- Dielectric tests
- Temperature rise tests
- Short-time current tests
- Making capacity tests for earthing switches
- Endurance tests
Instrument Transformer Testing (IEC 62271-110)
Precision testing of current and voltage transformers for accurate measurement and protection.
- Accuracy class verification
- Burden tests
- Polarity and phase displacement tests
- Insulation resistance tests
- Partial discharge tests
- Temperature rise tests
Additional IEC 62271 Standards Coverage
Why Choose TerraWatt for MV Commissioning?
IEC 62271 Expertise
Deep knowledge of all IEC 62271 series standards and testing requirements
Advanced Testing Equipment
State-of-the-art testing equipment for accurate and reliable results
Compliance Assurance
Comprehensive documentation and certification for regulatory compliance
Protection & Control System Testing
Comprehensive testing services for protection relays, control systems, and SCADA/PMS integration. Our expert team ensures reliable operation, proper coordination, and compliance with international standards.
Primary Injection Testing
High-current testing to verify the complete protection system performance including CTs, relays, and trip circuits under actual operating conditions.
- High-current injection up to several kA
- Complete protection system verification
- CT ratio and polarity verification
- Relay pickup and timing verification
- Trip circuit continuity and functionality
- Burden testing of current transformers
- Phase angle and magnitude verification
- Documentation of actual vs. calculated values
Secondary Injection Testing
Precise low-voltage testing of protection relays and control systems to verify settings, logic, and coordination without energizing primary equipment.
- Relay setting verification and calibration
- Protection logic and scheme testing
- Timing and coordination verification
- Fault simulation and response testing
- Communication protocol testing
- Analog and digital I/O verification
- Event recording and oscillography testing
- Relay memory and data integrity checks
Protection Relay Testing
Comprehensive testing of modern digital and legacy electromechanical protection relays to ensure proper operation and coordination.
- Overcurrent protection testing (50/51)
- Distance protection testing (21)
- Differential protection testing (87)
- Directional and power protection testing
- Frequency and voltage protection testing
- Auto-reclosing and synchronism check testing
- Communication and IEC 61850 GOOSE testing
- Relay coordination and selectivity verification
SCADA / PMS Signal Verifications
End-to-end verification of SCADA and Power Management System signals, ensuring accurate data transmission and control functionality.
- Analog signal accuracy verification (4-20mA, 0-10V)
- Digital status signal verification
- Control command execution testing
- Alarm and event signal verification
- Communication protocol testing (Modbus, DNP3, IEC 61850)
- HMI display and control verification
- Data logging and historical trending verification
- Cybersecurity and access control testing
Control System Integration Testing
Comprehensive testing of integrated control systems including automation, protection, and monitoring systems.
- Interlocking logic verification
- Sequence of operations testing
- Emergency shutdown system testing
- Load shedding and restoration testing
- Automatic transfer switch testing
- Generator synchronization testing
- Power quality monitoring verification
- Integration with building management systems
Compliance and Documentation
Comprehensive documentation and compliance verification for all testing activities according to international standards.
- IEEE C37 series compliance verification
- IEC 61850 standard compliance testing
- NERC reliability standards compliance
- Local utility interconnection requirements
- Detailed test reports and certificates
- As-built documentation updates
- Training and knowledge transfer
- Maintenance recommendations and schedules
Advanced Testing Equipment & Tools
Standards & Compliance
IEEE Standards
C37.90, C37.100, C37.2 series compliance
IEC Standards
IEC 61850, IEC 60255 series compliance
NERC Standards
PRC series reliability standards
Local Codes
Utility interconnection requirements
Our Preferred Platform
Powered by
CxPlanner
The industry's fastest commissioning software — delivering efficient project execution and real-time visibility for all stakeholders.
50%
Wasted work eliminated per year through streamlined workflows and automated reporting.
Say goodbye to slow processes and hello to efficient project delivery.
Additional Service
Need Professional
Test Equipment?
We offer a wide selection of high-end commissioning and testing equipment for rent. From relay test sets to power quality analyzers — get the right tools for your project.
View Rental Equipment
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