About the Service
Relay Coordination Study & Analysis ensures your protective devices—like relays and breakers—work in perfect sequence during electrical faults. This helps isolate only the faulted area, keeping the rest of your system running and protected. The result? Fewer outages, better safety, and less downtime for your operations.
Professional relay coordination analysis utilizes time-current characteristic curves and advanced computer modeling to verify protective device operation sequences during fault conditions. Protection coordination studies ensure selective fault isolation by maintaining proper time intervals between upstream and downstream protective devices throughout the electrical system.
Comprehensive protective relay coordination encompasses overcurrent relay settings, time-current curve analysis, coordination interval verification, and selectivity assessment for all protection schemes. Relay coordination studies follow IEEE and IEC standards to provide reliable protection system design that minimizes system disruption while ensuring personnel and equipment safety.
Three Phase Tech Services delivers professional relay coordination study services including protective device modeling, time-current analysis, coordination verification, and relay setting optimization. Our protection engineers utilize industry-standard software and established coordination principles to provide accurate relay coordination analysis that ensures electrical system selectivity, reliability, and safety.
Our Clients
Why choose us
We make relay coordination simple, accurate, and reliable—so your system stays protected and productive.
Smart Fault Isolation
Only affected zones trip—no full system shutdowns. Professional relay coordination ensures selective fault isolation by establishing proper protective device operation sequences. Smart fault isolation minimizes system disruption by tripping only the minimum equipment necessary to clear faults while maintaining power to healthy system areas.
Equipment Protection
Prevent unnecessary wear and electrical damage. Coordinated protection systems prevent equipment damage by ensuring proper fault clearing and minimizing fault exposure time. Equipment protection through relay coordination reduces maintenance costs, extends equipment life, and prevents catastrophic failures that could damage expensive electrical assets.
Regulatory Compliance
Meet utility and safety standards with confidence. Professional relay coordination ensures compliance with utility interconnection requirements, electrical codes, and safety standards. Compliance verification protects against regulatory violations and ensures electrical installations meet all applicable protection and coordination requirements.
Future-Ready System
Prepared for expansions and upgrades without risk. Relay coordination studies provide foundation for future system expansion by establishing protection schemes that accommodate load growth and equipment additions. Future-ready coordination ensures new equipment can be integrated while maintaining proper protection selectivity and system reliability.
Services offered
Our Relay Coordination Study provides a detailed look at fault behavior and device response. We ensure your protective relays are correctly set to protect both equipment and people—fast and effectively.
Protective relay setting review
Comprehensive evaluation of protective relay settings including overcurrent, directional, differential, and distance protection elements. Relay setting review verifies proper pickup values, time delays, and characteristic curves for optimal protection performance and coordination.
Setting review includes electromechanical, solid-state, and digital relay analysis with verification of current transformer ratios, voltage transformer connections, and protection element configurations. Analysis ensures relay settings provide adequate protection sensitivity while maintaining stability during normal operating conditions.
Setting Review Components
- Pickup Setting Verification: Confirmation of proper pickup values for all protection elements
- Time Delay Assessment: Evaluation of time delay settings for coordination requirements
- Characteristic Curve Analysis: Review of time-current characteristic selections
- Protection Element Configuration: Verification of protection function enablement and logic
- Setting Documentation: Comprehensive documentation of recommended settings
Fault current analysis
Detailed fault current analysis providing input data for relay coordination studies. Fault current calculations determine available short circuit currents at protective device locations for accurate coordination analysis and proper relay setting calculations.
Fault analysis includes symmetrical and asymmetrical fault calculations, motor contribution assessment, and fault current decay analysis. Results provide essential data for protective device coordination and verification of adequate protection coverage throughout the electrical system.
Fault Analysis Elements
- Three-Phase Fault Currents: Maximum fault current calculations for relay pickup settings
- Ground Fault Currents: Zero sequence fault current analysis for ground protection
- Minimum Fault Currents: End-of-line fault calculations for protection sensitivity
- Motor Contribution: Assessment of motor fault current contribution and decay
- Fault Current Distribution: Current flow analysis for directional protection settings
Sequence coordination of devices
Systematic coordination analysis ensuring proper protective device operation sequence during fault conditions. Sequence coordination verifies that downstream devices operate before upstream devices with adequate coordination intervals for reliable selectivity.
Coordination sequence analysis includes radial and loop systems with consideration of multiple protection zones and backup protection schemes. Analysis ensures proper coordination under all system operating conditions and fault scenarios.
Coordination Sequence Elements
- Primary Protection Coordination: Main protection scheme coordination verification
- Backup Protection Analysis: Secondary protection coordination assessment
- Zone Coordination: Protection zone boundary coordination verification
- Directional Coordination: Directional overcurrent protection coordination
- Communication Schemes: Pilot protection and communication-assisted coordination
Time-current curve plotting
Professional time-current curve plotting and analysis for visual coordination verification. Time-current plots display protective device characteristics on logarithmic scales enabling clear visualization of coordination intervals and identification of coordination problems.
Curve plotting includes all protective devices in coordination study with accurate representation of device characteristics, fault current applications, and coordination intervals. Professional plotting provides clear documentation of coordination analysis and recommendations.
Curve Plotting Components
- Device Characteristic Plotting: Accurate representation of protective device curves
- Fault Current Application: Fault current lines showing device operation points
- Coordination Interval Display: Visual verification of coordination margins
- Multiple Scenario Analysis: Curves for different system operating conditions
- Professional Documentation: High-quality plots for study documentation
Coordination report & recommendations
Comprehensive coordination study reports documenting analysis methodology, coordination verification, and specific recommendations for protection system improvement. Professional reports provide clear guidance for relay setting optimization and protection system enhancement.
Coordination reports include executive summary, detailed analysis results, time-current plots, setting recommendations, and implementation guidance. Professional documentation supports regulatory compliance and provides reference for protection system maintenance.
Report Components
- Executive Summary: Overview of coordination study findings and key recommendations
- Analysis Methodology: Description of coordination analysis methods and standards
- Coordination Assessment: Detailed evaluation of protection system coordination
- Setting Recommendations: Specific relay setting recommendations and justification
- Implementation Guidance: Instructions for implementing recommended changes
With accurate relay coordination, you avoid cascading failures and keep your facility running safer and longer.
