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Relay Coordination Study & Services
Last Updated: 2026
A relay coordination study optimizes protective relay settings so that only the faulty section of your electrical system is isolated during a fault, keeping the rest of the network powered. Elion analyzes LV, MV, and HV protection schemes using ETAP/PowerFactory simulation and delivers TCC plots with setting recommendations — trusted since 2010 across 30,000+ audits.
What is Relay Coordination?
Relay Coordination involves setting and coordinating protective relays in an electrical system to ensure selective isolation during faults, minimizing disruption while protecting equipment and personnel.
A well-executed Relay Coordination Study helps optimize relay settings so that only the faulty section is isolated during a fault, maintaining power continuity in the rest of the system.
Why is Relay Coordination Important?
- Ensures system protection: Prevents cascading failures during faults.
- Selective tripping: Isolates only the affected section while maintaining supply to healthy areas.
- Compliance with standards: Required under IS, IEC, and IEEE norms for safety and reliability.
- Prevents equipment damage: Timely isolation prevents stress on cables, transformers, and switchgear.
- Enhances operational safety: Minimizes arc flash incidents and operational hazards.
- Supports system stability: Ensures network stability during fault conditions.
What Elion Offers in Relay Coordination Services
- Short Circuit Studies: To calculate fault levels using ETAP/Dialux/PowerFactory.
- Load Flow Analysis: To understand load conditions impacting relay settings.
- Protection Relay Settings Calculation: Current and time settings for relays.
- Time-Current Characteristic (TCC) Curves: For visual coordination validation.
- Coordination of Relays: For LV, MV, and HV systems, including ACB, MCCB, ELCB, and IDMT relays.
- Recommendations for Setting Adjustments: To align with system conditions and upgrades.
- Verification and Testing: Field testing and relay setting validation if required.
- Detailed Reports: Comprehensive report with TCC plots, settings tables, and recommendations.
- Training: On relay operations, coordination concepts, and interpretation of TCC curves.
Standards We Follow
- IS 3231 (Protective Relays)
- IEC 60255 Series
- IEEE Std 242 (Buff Book)
- IEEE Std 399 (Brown Book)
- National Electrical Code (NEC)
- OEM recommendations for relays and breakers
Benefits of Choosing Elion for Relay Coordination
- 20+ years of electrical safety and system study expertise.
- Pan-India service for industrial, commercial, and critical infrastructure facilities.
- Advanced simulation tools (ETAP, PowerFactory) for accurate analysis.
- Experienced engineers with deep protection system knowledge.
- Actionable, clear reporting with recommendations.
- Support for periodic review and compliance requirements.
- Post-study assistance for implementing relay setting changes.
Who Needs Relay Coordination Studies?
- Industries with large electrical networks
- Data centers and IT facilities
- Hospitals and healthcare facilities
- Oil & Gas and chemical plants
- High-rise commercial and residential complexes
- Renewable energy plants
- Utilities and substations
Our Relay Coordination Study Process
- Data Collection: SLDs, relay details, protection schemes, equipment ratings.
- Short Circuit & Load Flow Studies: Establish system behavior under fault conditions.
- Relay Settings Calculation: Based on fault levels, load currents, and OEM data.
- TCC Curve Development: To visualize overlapping and coordination.
- Recommendations & Adjustments: Proposed relay settings for effective selectivity.
- Reporting: Submission of detailed report with plots and tables.
- Implementation Support: Assistance during relay setting adjustments and field testing.
Factors That Decide Relay Coordination Study Cost in India
Cost depends on: number of relays and protection devices in the system, system voltage level (LV vs. MV vs. HV), whether a short circuit and load flow study is required alongside the coordination study, and whether field testing/setting validation is included. Request a fixed-fee quote with your system details.
Contact Elion for Relay Coordination Studies
Ensure the safety, reliability, and efficiency of your electrical system with Elion’s expert Relay Coordination Studies.
Request a Quote or contact us at [email protected].
Client Testimonial
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Frequently Asked Question (FAQs)
It’s an analysis that optimizes protective relay settings so only the faulty section of an electrical system is isolated during a fault, maintaining supply to unaffected areas.
Without proper coordination, a single fault can trip more of the system than necessary, causing unnecessary outages, or fail to isolate the fault fast enough, risking equipment damage.
IS 3231, IEC 60255, IEEE 242, IEEE 399.
ETAP, PowerFactory, Dialux (for lighting coordination when relevant).
Graphs showing time-current behavior of relays for coordination visualization.
SLDs, equipment ratings, relay specs, fault data.
Calculation of fault levels to determine relay settings.
Yes, upon request.
Yes, by timely isolation during faults.
Every 3-5 years or after major system changes.
Without coordination:
- Multiple breakers might trip together.
- Healthy parts of the system may shut down unnecessarily.
- Equipment like motors, transformers, and switchgear can get damaged.
- Downtime and maintenance costs may rise.
The process includes:
✔ Collecting system data (diagrams, relay specs)
✔ Short-circuit and load flow analysis
✔ Analyzing time–current curves (TCCs)
✔ Calculating optimal relay settings
✔ Verifying coordination outcomes
✔ Preparing a detailed report and recommendations.
We recommend reviewing and updating your coordination study:
Every 3–5 years, or
After major system changes like new equipment, expanded loads, or protection upgrades.
LV, MV, and HV protection devices including ACB, MCCB, ELCB, and IDMT relays.
Simulation software including ETAP and PowerFactory for short circuit, load flow, and coordination analysis.
Field testing and relay setting validation can be included where required, in addition to the simulation-based study.
A Time-Current Characteristic plot showing how protective devices respond to fault current over time, used to verify correct coordination between devices.
After any system change (new equipment, load changes, network reconfiguration), and periodically as part of ongoing electrical safety review.
A detailed report with TCC plots, relay setting tables, and recommendations for setting adjustments.