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ANSI DEVICE NUMBER CODES


ANSI Device Numbers 
In the design of electrical power systems, the ANSI Standard Device Numbers (ANSI /IEEE Standard C37.2) denote what features a protective device supports (such as a relay or circuit breaker). These types of devices protect electrical systems and components from damage when an unwanted event occurs, such as an electrical fault. Device numbers are used to identify the functions of devices shown on a schematic diagram. Function descriptions are given in the standard. continue..



Device numbers may be combined if the device provides multiple functions, such as the instantaneous/time-delay AC over current relay denoted as 50/51 continue..


In the design of electrical power systems, the ANSI Standard Device Numbers (ANSI /IEEE Standard C37.2) denote what features a protective device supports (such as a relay or circuit breaker). These types of devices protect electrical systems and components from damage when an unwanted event occurs, such as an electrical fault. Device numbers are used to identify the functions of devices shown on a schematic diagram. Function descriptions are given in the standard. ANSI/IEEE C37.2-2008 is one of a continuing series of revisions of the standard, which originated in 1928. continue..


Part 1 for ANSI device numbers. continue..


Part 2 for ANSI device numbers. continue..


The ANSI numbering system is a standard numbering method used on certain electronic power systems and machines. The ANSI system originated in the early 1900s, and is still a common form of denotation. The ANSI system is a creation of the Institute of Electrical and Electronics Engineers (IEEE), which has continued to revise and revive the code over the years. Today, the ANSI numbering system helps engineers and technicians draw up simple schematics without using entire names. The system is used to draw simple electronic circuits. To understand the system you need to familiarize yourself with the number descriptions. continue..


Device numbers may be also use in designing electrical distribution system like:
 27 - Undervoltage
47 - Phase sequence
49 - Thermal overload
50 - Instantaneous
51 - Time overcurrent
59 - Overvoltage
63 - Sudden pressure
67 - Directional overcurrent
86 - Lockout
87 - Differential
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