Hi All,Can anyone please give me list of ANSI codes for different types of Relay protection? e.g. 87 - for differential Protection relay.78 - Out of step protection. Electrically operated valve is an electrically operated, controlled or monitored valve in a fluid line. Note: The function of the valve may be indicated by the use of the suffixes. Regulating device functions to regulate a quantity, or quantities, such as voltage, current, power, at a speed, frequency, temperature, and load, at a certain value or between certain (generally close) limits for machines, tie lines or other apparatus.Voltage and power directional relay is a relay that permits or causes the connection of two circuits when the voltage difference between them exceeds a given value in a predetermined direction and causes these two circuits to be disconnected from each other when the power flowing between them exceeds a given value in the opposite direction.

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