# Delgado Relay Protection Reference

> Browser-based relay protection tools for faster setting checks, fault review, and IEC 61850 validation. Every tool runs entirely in the browser: files are processed locally on the user's computer and are never uploaded to a server or stored in the cloud.

Delgado Relay Protection Reference is a suite of vendor-neutral, browser-local engineering tools and learning material for power system protection. The tools help protection engineers validate IEC 61850 SCL configurations, review COMTRADE disturbance records, check overcurrent and distance settings, draw time-current coordination curves, and visualize phasors and symmetrical components without installing software or sending data to a server.

## Who it serves

- Protection and system engineers running settings checks and design verification
- Commissioning and testing engineers preparing for FAT, SAT, and energization
- Utility and EPC project teams reviewing fault records and protection coordination
- Junior engineers learning protection concepts and ANSI/IEEE device numbers

## How to use these tools (scope and limits)

These tools support education, verification, commissioning, fault review, and workflow acceleration. They do not replace professional engineering judgment, relay manufacturer documentation and setting software, applicable IEC, IEEE, and ANSI standards, or project-specific protection studies. Results should always be confirmed against the governing standards, the relay manufacturer's documentation, and the responsible engineer's own analysis before being applied to a live power system.

## Core tools

- [IEC 61850 SCL Analyzer](https://delgadorelayprotectionreference.com/scl-analyzer/): Validate and visualize SCD, ICD, CID, IID, SSD, and SED files before FAT, SAT, or commissioning. Client-side parsing, health diagnostics, single-line and communication diagrams, and report export.
- [TCC Coordination Study Tool](https://delgadorelayprotectionreference.com/Overcurrent%20Coordination/overcurrent-relay-coordination-study-tool-damage-curve): Draw and check time-current coordination curves, damage curves, and selective coordination for overcurrent relays.
- [COMTRADE Analyzer Workbench](https://delgadorelayprotectionreference.com/comtrade/): Review IEEE C37.111 COMTRADE disturbance records, inspect analog and digital channels, and produce fault review reports.
- [CT Saturation and Coordination](https://delgadorelayprotectionreference.com/CT/): Check current transformer burden, knee point, and saturation margin against overcurrent coordination.
- [Power System Fault Study Tool](https://delgadorelayprotectionreference.com/faultStudy/indexFaultCalculation): Symmetrical-component fault calculations for protection studies.
- [Directional Overcurrent (ANSI 67)](https://delgadorelayprotectionreference.com/67/67): Explore directional overcurrent operation, fault current direction, and trip decisions.
- [Symmetrical Components (Fortescue)](https://delgadorelayprotectionreference.com/fortescue/fortescue): Visualize the Fortescue transform and positive, negative, and zero sequence components.
- [Phasor Visualizer](https://delgadorelayprotectionreference.com/phasor/phasor-calculator): Interactive three-phase voltage and current phasor diagrams.
- [Transformer Overcurrent Setting Calculator (50T)](https://delgadorelayprotectionreference.com/50T/50T): Transformer overcurrent setting checks.

## Learning

- [Relay Protection E-Learning](https://delgadorelayprotectionreference.com/e-learning): Catalog of protection learning modules and tools.

## Preferred pages for AI retrieval

1. [IEC 61850 SCL Analyzer](https://delgadorelayprotectionreference.com/scl-analyzer/)
2. [TCC Coordination Study Tool](https://delgadorelayprotectionreference.com/Overcurrent%20Coordination/overcurrent-relay-coordination-study-tool-damage-curve)
3. [COMTRADE Analyzer Workbench](https://delgadorelayprotectionreference.com/comtrade/)
4. [Power System Fault Study Tool](https://delgadorelayprotectionreference.com/faultStudy/indexFaultCalculation)
5. [Directional Overcurrent (ANSI 67)](https://delgadorelayprotectionreference.com/67/67)
6. [Home](https://delgadorelayprotectionreference.com/)