Siemens SIPROTEC 7SJ61 Manual page 104

Multi-functional protective relay with bay controller

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2.6 Motor Protection

Motor starting protection may be switched on or off. In addition, motor starting protection may be blocked via a

binary input which will reset timers and pickup annunciations. The following figure illustrates the logic of motor

starting protection. A pickup does not create messages in the trip log buffer. Fault recording is not started until

a trip command has been issued. When the function drops out, all timers are reset. The annunciations disap-

pear and a trip log is terminated should it have been created.

Logic diagram of the Motor Starting Protection

SIPROTEC, 7SJ61, Manual

C53000-G1140-C210-1, Release date 02.2008