Buy Now What is Helinks STS ? HELINKS STS is an IEC 61850 Power System Engineering Tool.STS is IED manufacturer independent. It provides:System Specification according to IEC 61850 (SSD File)System Configuration according to IEC 61850 (SCD File)STS imports and creates any SCL file in order to provide a flexible engineering process. (ICD, IID, CID, IID, SED, SSD, SCD)Engineering Libraries leverage efficiency and standardization of your IEC 61850 solutions.STS is a Signal Engineering Tool. Signal Engineering with STS bridges the gap between IEC 61850 and conventional signal handling.STS provides comprehensive project documentation. SCL file content is available in human readable format.