The Interactive Relay Protection Reference

Analyze Fault Records. Coordinate Relays. Test Protection Logic.

Analyze COMTRADE, coordinate relays, test directional trip logic, and visualize phasors directly in the browser.

Open COMTRADE Waveform review, cursors, X/R Check Coordination Relay curves and transformer margins Test Directional Logic Torque regions, angles, trip state Visualize Phasors Real-time vector and impedance view

Featured Engineering Tool

COMTRADE Analysis Workbench

Inspect fault records with synchronized waveform traces, cursor measurements, and event timing in one browser session.

Input: CFG/DAT files, channel selection, cursors

Output: phasors, X/R cues, and event context

Open Tool

Overcurrent Relay Coordination Tool

Study transformer protection coordination with relay curves, device grading, and damage-curve references.

Input: CT ratios, pickup settings, curve family

Output: coordination margin and operating order

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Phasor and Impedance Visualizer

Track voltage, current, and impedance movement with a live phasor display built for protection studies.

Input: V/I magnitude, angle, sequence change

Output: vector position and impedance trend

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Directional Overcurrent Trip Tool

Understand directional trip regions using impedance angle, reference direction, and system X/R behavior.

Input: fault angle, reference direction, X/R

Output: trip or no-trip region

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Why this site exists

A practical reference built for real protection engineering workflows

Delgado Relay Protection Reference is an interactive engineering workspace where protection engineers can review fault behavior, test relay concepts, and move between tools, visual explanations, and technical notes without leaving the browser.

Browser-based tools

Open practical studies quickly without waiting for software installs or spreadsheets.

Engineering-first language

Built around COMTRADE review, relay coordination, directional logic, phasors, and fault analysis.

Learning plus execution

Move from concept review to hands-on interaction with the same workflow and vocabulary.

Built for

Useful across utility, EPC, commissioning, and training environments

The site is structured for engineers who need quick technical clarity, whether they are studying fundamentals, checking settings logic, reviewing fault records, or explaining protection behavior to a team.

Protection and system engineers

Designed for engineers working on relay studies, fault review, protection setting interpretation, and technical decision-making.

Protection Engineers Utility and Industrial Engineers

Project and field delivery teams

Useful for teams validating settings intent, explaining coordination decisions, and preparing testing or commissioning activity.

Testing and Commissioning Teams EPC and Consultancy Teams

Learning and technical development

Also structured for self-study, guided explanation, and training support when building protection engineering intuition.

Students and Junior Engineers Trainers and Technical Leads

How engineers use it

From waveform review to setting insight

These sections help visitors quickly understand where the site fits in their workflow and why the tools are relevant.

Fault record review

Use browser-based COMTRADE analysis to inspect event timing, current and voltage behavior, and phasor relationships during disturbance review.

Coordination and settings checks

Compare relay curves, review pickup assumptions, and explain grading margins before a detailed study or setting revision.

Training and concept visualization

Walk through directional logic, phasors, impedance movement, and sequence concepts with tools that are easier to grasp than static diagrams.

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About the platform

An independent relay protection resource for engineers worldwide

This platform is designed to make relay protection concepts easier to inspect, test, and communicate. It brings together interactive tools, guided learning modules, and engineering notes so users can move from theory to application more quickly.

For engineers arriving from search, the homepage makes the site purpose clear: tools first, learning second, and reference material close behind.