DIN EN IEC 60255-1:2024-06

This part of the IEC 60255 series of standards specifies common rules and requirements applicable to measuring relays and protection equipment, including any combination of equipment to form a distributed protection scheme for power system protection such as control, monitoring and process interface equipment, to obtain uniformity of requirements and tests. This document covers the main technologies in use today; other emerging technologies present specific EMC and safety issues but the philosophy in this document will be applied. All measuring relays and protection equipment used for protection within the power system environment are covered by this standard. No general or specific restrictions are specified for the scope of application of this document. Other documents in the IEC 60255 series of standards may specify their own requirements, which then take precedence over this document For special applications (marine, railway, aerospace, explosive atmospheres, computers, etcetera), the general requirements within this standard may need to be enhanced by additional special requirements. The standard differs from DIN EN 60255-1 (VDE 0435-300):2010-09 as follows: a) scope of document clarified; b) merging units and communications as an integral part of the protection added; c) binary output clarification expanded; d) environmental operating conditions added (Annex B); e) test reference conditions added; f) multiple changes to improve understanding across most clauses; g) derating by manufacturer added; h) safety and EMC tests removed from document and referenced only; i) relay setting and type test guidelines modified (Annex A); j) battery monitor port and low power instrument transformers added. Measuring relays and protection equipment are typically used where electrical equipment needs to be protected: generally speaking, this includes power plants, stations, and industrial sites. Special applications include marine, railway, aerospace, explosive atmospheres, computers, etcetera.