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The Type NAA relay is the general designation of a large family of special purpose auxiliary relays. Most NAA relays have two or more telephone type auxiliaries mounted in the regular draw out case. In some specific types an overcurrent function may also be included.
Ground distance auxiliary (NAA15)
Out-of-step auxiliary (NAA19)
Transferred tripping auxiliary (NAA27)
Relay Supervision (NAA30)
Application specific configurations
Adjustable pickup/dropout times