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Which Motor Protection Are Practically Disabled During Starting Of Motor? |
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  Nov 21 2008, 10:32 AM
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#1
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 Group: Members Posts: 1 Joined: 21-November 08 Member No.: 4,975  |
I want to actually ask that
1) among all the protections which are the protections that are/should be disabled during starting time of the motor in Numerical Relay. 2) Current unbalance and Earth protections, both measured by current unbalance situations, so which should be more sensitive during running condition of motor. |
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Nov 21 2008, 06:14 PM
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#2
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello Saurabh
Welcome to the forum. For good motor protection, all protection features should be permanently enabled, but the shearpin protection, if current based, may need to be disabled during start. Current and earth leakage protection may be desensitised during start, especially if a soft starter is being used, in order to cope with the harmonics generated during start. Best regards, Mark. -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Nov 22 2008, 06:18 AM
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#3
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Intermediate Member Group: Full Member Posts: 11 Joined: 5-May 07 Member No.: 3,240 |
QUOTE (Saurabh @ Nov 21 2008, 04:02 PM)  I want to actually ask that 1) among all the protections which are the protections that are/should be disabled during starting time of the motor in Numerical Relay. 2) Current unbalance and Earth protections, both measured by current unbalance situations, so which should be more sensitive during running condition of motor. |
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