Protection Coordination / Relay Setting Study – Complete Calculation Package (IEC 60255-151)

Description:

Professional protection coordination package covering relay trip-time calculation, all 4 IEC 60255 standard inverse-time curves, TCC curve data generation, and discrimination margin verification between upstream/downstream relays. Includes the full calculation workbook (Excel, live formulas, hand-verified against independent calculation) plus a formatted report (Word) documenting methodology, curve constants, and coordination results. Ideal for protection engineers and electrical design teams needing a defensible relay grading calculation basis.

Disclaimer:

This document is a calculation template and methodology reference based on IEC 60255-151. It is not a substitute for a complete, project-specific protection coordination study performed by a qualified protection engineer using actual system data, relay manufacturer specifications, and the project's protection philosophy. Trip times, grading margins, and coordination status generated from this template must be independently verified before use for relay setting implementation. No liability is accepted for equipment damage, safety incidents, or losses arising from use of this document.