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jghrist I agree with you absolutely regarding disabling the protection. In order to set OC higher than the motor start current I need to increase the OC setting at list 50%, that's why I'be been seeking for some other solution.

Thanks for replay. I was not in the project from the beginning and I'm not the one who made configuration file for the relay parameters. In the moment I came 3 out of 4 MV motors have been already running and when we wanted to start the fourth one we faced the issue. And guess what, in those...

Good day to All, I already posted this topic but in the wrong section of this forum so I'll do here again. This is first time I deal with this type of relay (I've met ABB, Areva, Siemens) and we have problem during the motor start-up. Since that start time is longer than definite time set for...

Good day to All, This is first time I'dealing with this type of relay (I've met ABB, Areva, Siemens) and we have problem during the motor start-up. Since that start time is longer than definite time set for 50/51 the protection trips due to 50/51 during start-up. The real motor start current is...