Ansi Relay Symbols

Selection from iec 617 ieee c37 2 1991 and ieee c37 2 1979 1mrk 590 006 ben page 2 symbols and designations cont d sync synchronizing check block blocking device lo lock out tcs trip circuit supervision x y translation of signal a d or analog to digital conversion operation above a set value e g.

Ansi relay symbols. A 27 59 device for example. The other is given in iec 60617 and uses graphical symbols. Multifunction relays have combinations of device numbers. For example a time overcurrent relay is designated a 51 device while an instantaneous overcurrent is a 50 device.

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 ieee standard device numbers 1 master element 2 time delay starting or closing relay 3 checking or interlocking relay 4 master contactor 5 stopping device 6 starting circuit breaker 7 rate of change relay 8 control power disconnecting device. The functions are supplemented by letters where amplification of the function is required. Typical electrical drawing symbols and conventions.

Please refer to the ansi ieee c37 2 standard. One is given in ansi standard c37 2 and uses a numbering system for various functions.