IEC 60255-151 TCC Curve Library (SVG + CSV)

IEC 60255-151 is an international standard specifying the format, content, and exchange requirements for time-current characteristic (TCC) curves used in numerical and electromechanical protective relays. The TCC Curve Library provides machine-readable, vendor-agnostic representations of standardized inverse-time, definite-time, and customized relay characteristics—including IEEE C37.112, IEC 60255-15, and user-defined curves—enabling consistent protection coordination studies across software platforms. Each curve is defined by discrete (time, current) coordinate pairs in CSV for computational use (e.g., coordination checking, selectivity verification), while corresponding SVG files offer human-readable, scalable graphical renderings with embedded metadata (e.g., relay model, standard compliance, curve type). The library supports traceability, version control, and integration into digital twin environments, facilitating automated relay setting validation, arc-flash analysis, and compliance reporting. By decoupling curve data from proprietary relay configuration tools, it promotes transparency, reproducibility, and collaborative protection engineering across utilities, consultants, and OEMs.