IEEE - The Institute of Electrical and Electronics Engineers@ Inc.
Scope
This document specifies standard service conditions@ standard ratings@ environmental performance requirements@ and testing requirements for communications networking devices and communications ports in protective relays installed in electric power substations. It does not cover such equipment designed for operation in other environments@ such as office locations. Other than their communications ports@ it does not cover such equipment used in protective relaying applications@ for which IEEE Std C37.90TM-2007 [B8]@1@2 IEEE Std C37.90.1TM-2002 [B9]@ IEEE Std C37.90.2TM-2004 [B10]@ and IEEE Std C37.90.3TM-2001 [B11] shall apply. Purpose The purpose of this standard is to define the environmental conditions present in electric power substations and to establish a common reproducible basis for designing and evaluating communications networking devices to be installed in those substations. It is a freestanding document@ with no normative references to other standards. 1 The numbers in brackets correspond to those of the bibliography in Annex E. 2 The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Electronics Engineers@ Inc.