IEC 60255-1 pdf download

IEC 60255-1 pdf download Measuring relays and protection equipment – Part 1: Common requirements
1 scope
This part of lEC 60255 specifies common rules and requirements applicable to measuringrelays and protection equipment including any combination of devices to form schemes forpower system protection such as control, monitoring and process interface equipment in orderto obtain uniformity of requirements and tests.
All measuring relays and protection equipment used for protection within the power systemenvironment are covered by this standard.Other standards in this series may define their ownrequirements which in such cases shall take precedence.
For special applications (marine，aerospace，explosive atmospheres,computers,etc.), thegeneral requirements within this standard may need to be enhanced by additional specialrequirements.
The requirements are applicable only to relays in new condition.All tests in this standard aretype tests, unless otherwise declared.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60044-1:1996, Instrument transformers – Part 1: Current transformers
IEC 60044-2:1997, Instrument transformers – Part 2: Inductive voltage transformers
IEC 60044-5;2004, Instrument transformers – Part 5: Capacitor voltage transformers
IEC 60044-7:1999, Instrument transformers – Part 7: Electronic voltage transformers
IEC 60044-8:2002, Instrument transformers – Part 8: Electronic current transformers
IEC 60050-191:1990，Internation Electrotechnical Vocabulary – Chapter 191: Dependabilityand quality of service
IEC 60050-447:2009，International Electrotechnical Vocabulary – Part 447: Measuring relays
IEC 60068-2-1:2007,Environmental testing – Part 2-1:Tests – Test A: Cold
IEC 60068-2-2:2007, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-14:2009，Environmental testing – Part 2-14: Tests – Test N: Change oftemperature
EC 61 81 0-1 , Electromechanical elementary relays – Part 1: General requirements
IEC 61 81 0-2, Electromechanical elementary relays – Part 2: Reliability
IEC 61 850 (all parts), Communication networks and systems in substations
IEC 61 850-9-2, Communication networks and systems in substations – Part 9-2: Specific
Communication Service Mapping (SCSM) – Sampled values over ISO/IEC 8802-3
3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 60050-447, as well as the following, apply.
3.1
absolute error
difference between a measured operate value of the characteristic quantity or a measured value of a specific time and its declared value (e.g. setting value).
3.2
alternating component
in d.c. expressed as a percentage of the difference between the maximum value U max and the minimum value U min of a pulsating d.c. voltage to the mean value U 0 of this voltage
3.3
analogue inputs and outputs
current or voltage inputs/outputs whose values are directly proportional to physical measured quantities i.e. transducer input
3.4
assigned error
error limits within which the manufacturer declares that any device of a given type will perform under the reference conditions
3.5
binary inputs/outputs
inputs/outputs which have either an on or off state and can be either physical connections or supplied via a communication port