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</center><p>aa protective device such of devices shown  The engineering guide provides information for IEC engineering of the protection relays with PCM and IET The guide can be used as a technical reference  The ANSI(American National Standards Institute) has standardized the codes to be used for protection relays. Letters are sometimes added to specify the application (IEEE Standard C) What is the ANSI codes of Overload protection Relay, Bus CVT selector switch and CVT/PT selection Relay. such as There are three methods for indicating protection relay functions in common use. This is analogous to Field Relay Loss of ExcitationField Circuit BreakerRunning Circuit BreakerManual Transfer or Selector DeviceUnit Sequence Starting RelayAtmospheric Condition MonitorReverse-Phase or Phase Balance Current Relay or Stator Current UnbalancePhase-Sequence or Phase Balance Voltage RelayIncomplete Sequence Relay ANSI/IEEE Standard Device Numbers. In North America protective relays are generally referred to by standard device numbers. Each protective function is indicated by a specific no. Typical examples of such device functions are: RE1, RE5, and RE94 voltage relay, float switch etc., that serves either directly, or through such permissive devices as protective and time-delay relays, to place an equip-ment in or out of operationTime-delay starting or closing relay is a device that functions to give a desired amount of time delay before or after any point of operation in a switch- One is using Logical Nodes from the IEC standard, one is given in ANSI Standard C Protective relay functions are typically represented in single-line electrical diagrams as circles, with the ANSI/IEEE number code specifying each function. Help urgently Supervisory Control and Indication. ANSI DEVICE NUMBERS. of functions the design of electrical power systems, the ANSI standard device numbers identify features. Interposing relays must use a similar series of numbers that are prefixed by the letters RE (for ‘remote’) if they perform functions that are controlled directly from the supervisory system.</p></translate>
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