7/3/2013 1:05 PM | |
Posts: 235 Rating: (52) |
Dear all Please suggest me how to select thermal overload relay size(Rating) in star delta starter, and actual loaction(position) of OLR in S/D circuit. |
7/3/2013 2:14 PM | |
Joined: 4/23/2010 Last visit: 12/31/2023 Posts: 8092 Rating: (877) |
Please follow below links which shall help you to understand functioning of the overload relays. Link1 Link2 |
7/3/2013 4:25 PM | |
Joined: 1/21/2013 Last visit: 9/4/2024 Posts: 4620 Rating: (707) |
Hi jeet2907, Can you explain to us a bit more in detail your application? |
7/4/2013 10:47 AM | |
Posts: 202 Rating: (16) |
Hi there As the current is divided between the main & delta so it means that we need to select the relay half the rating of motor??? please do reply.....
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7/5/2013 12:19 PM | |
Posts: 202 Rating: (16) |
Hi Ste39 It means i have to go for that OLR which is 50% to that of the motor
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7/16/2013 12:34 PM | |||||||
Posts: 39 Rating: (9) |
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7/17/2013 7:13 AM | |
Posts: 235 Rating: (52) |
No dear in star delta we mounting OLR in phase current(mounting OLR exectly below to the main contactor),we can also put OLR in line current but we cant do that bcoz the main reason of money saving.If we put OLR in with line current (or say above the main contactor )we require relay range similar to the FLC so its higher rating and its cost is more than halved rating.Its a main reason to put OLR in phase current. For your refrence please find the attach sheet of star-delta wiring drg and control too.
Attachmentstra-delta scheme.pdf (628 Downloads) |
Last edited by: jeet2907 at: 7/17/2013 7:13 AM |
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This contribution was helpful to1 thankful Users |
7/17/2013 10:46 AM | |
Posts: 202 Rating: (16) |
Hi there Does the Line current or Phase effects the mounting or rating of OLR??? please explain....
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