Ansi Electrical Device Numbers

In the design of electrical power systems the ansi standard device numbers ansi ieee standard c37 2 standard for electrical power system device function numbers acronyms and contact designations identifies the features of a protective device such as a relay or circuit breaker these types of devices protect electrical systems and components from damage when an unwanted event occurs such.

Ansi electrical device numbers. These types of devices protect electrical systems and components from damage when an unwanted event occurs such as an electrical fault. A common example of this is an instantaneous time overcurrent relay. Selection from iec 617 ieee c37 2 1991 and ieee c37 2 1979 1mrk 590 006 ben page 5 ieee device numbers and functions ieee device numbers and func tions for switchgear apparatus the devices in switching equipments are referred to by numbers with appropriate suf fix letters when necessary according to the. Gedigitalenergycom 1 ansi standard device numbers common acronyms suffixes description 1 positive sequence 2 negative sequence a alarm auxiliary power ac alternating current an anode b bus battery or blower bf breaker failure bk brake bl block valve bp bypass bt bus tie bu backup c capacitor condenser compensator carrier current case or compressor ca cathode ch check valve.

Electrical device numbers ansi ieee device numbers are specified in ansi ieee standard c37 2 and are used to identify the functions of a device shown on a schematic diagram. A single device monitoring the signals coming from a set of current transformers cts commanding a circuit breaker to trip if the current exceeds a pre determined limit for any length of time instantaneous overcurrent protection ansi ieee code 50 or if the time current product exceeds a pre determined limit time. Even in those parts of the world where iec standards are. Relay symbols and device numbers.

Letters are sometimes added to specify the application ieee standard c37 2 2008. 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. Device numbers the more commonly used ones are in bold 1 master element 2 time delay starting or closing relay. Protection relay ansi standards.

These types of devices protect electrical systems and components from damage when an unwanted event occurs such as an electrical fault. In the design of electrical power systems the ansi standard device numbers denote what features a protective device supports such as a relay or circuit breaker. This standard applies to the definition and application of function numbers and acronyms for devices and functions used in electrical substations and generating plants and in installations of power utilization and conversion apparatus.