IEEE C37.2-1996 pdf download IEEE Standard Electrical Power System Device Function Numbers and Contact Designations
1. Overview
1.1 Scope
This standard applies to the definition and application of function numbers for devices used in electrical substationsand generating plants and in installations of power utilization and conversion apparatus.
NOTE — In the past, device function numbers have typically represented individual or component devices. These numbers mayalso be used to represent functions in microprocessor-based devices or software programs.
1.2 Purpose
A device function number, with an appropriate prefix and appended suffix is used to identify the function(s) of eachdevice installed in electrical equipment. This includes manual. partial-automatic, and automatic switchgear Thesenumbers are to be used in drawings, elementary and connection diagrams, instruction books, publications, andspecifications. In addition, for automatic switchgear, the device number may be physically placed on, or adjacent to.each device on the assembled equipment. This will enable a device to be readily identified.
NOTEThese device function desienations have been developed as a result of usage over many years. They may define theactual function the device perlors in equinment or they may refer to the electrical or other quantity to which the deviceis responsive. Hence, in some instances, there may be a choice of the function number to be used for a given device. Thepreferable choice to be made should be the function number that is recognized to have the narrowest interpretation in allcases. The choice should specifically identify a device in the minds of all individuals concerned with the design andoperation of the equipment.
2. References
This standard shall be used in conjunction with the following publications. When the following standards aresuperseded by an approved revision, the revision shall apply.
ASME Y1.1-1989, Abbreviations for Use on Drawings and in Text.
IEEE Std 315-1975,(Reaff 1993) 1EEE Standard Graphic Symbols for Electrical and Electronics Diagrams (ANSI).”EEE Std C37.20.1-1993,1EEE Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear (ANSI)
IEEE Std C37.20.2-1993,IEEE Standard for Metal-Clad and Station-Type Cubicle Switchgear (ANSI).
3. Standard device function number descriptions
3.1 Standard device function numbers
Each number, with its corresponding function name and a general description of the function, is listed below. An indexof device function names consisting of the corresponding device numbers and page numbers is provided on page 33.
NOTE -When alternate names and descriptions are included under the function, only the name and description that applies toach specific case should be used. In general, only one name for each device, such as relay, contactor, circuit breaker’switch. or monitor, is included in each function designation. However, when the function is not inherently restricted toamy specitic lype of cevice, and where the type of device itself is thus merely incidental, any one of the above listedalternative names, as applicable, may be substituted. For example, if for device function 6 a contactor is used for thepurpose in place of a circuit breaker, the function name should be specified as “*starting contactor.”
For every application of device function numbers, the originator should provide a brief definition for all devicefunction numbers used in that application, including all combinations of prefixes, function numbers, and suffixeslypical definitions are illustrated in Figures 3 and 4. These definitions should be included in the drawing where thelevice function number is used, or in a separate cdrawing or list to which the other drawings refer. All instruction booksand other documents shall also include the device function number definitions.
Numbers from 95 through 99 should be assigned only for those functions in specific cases where none of the assignedstandard device function numbers are applicable. Numbers that are “reserved for future application” should not beused.
3.1.1 Device number 1-master element
A device, such as a control switch, etc, that serves, either directly or through such permissive devices as protective andtime-delay relays, to place equipment in or out of operation.
NOTE — This number is normally used for a hand-operated device, although it may also be used for an electrical or mechanicadevice for which no other function number is suitable.
IEEE C37.2-1996 pdf download
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