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How to calculate overload settings on star delta starters

Power Distribution and Digital

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Sandile
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How to calculate overload settings on star delta starters

 
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MathieuGuillot
Lieutenant Lieutenant
Lieutenant
0
2523

Re: How to calculate overload settings on star delta starters

Hello @Sandile 

 

There are several wiring schemes for star delta motor starters with different location for overload protection: 

 

 Star Delta.png

 

When the overload protection is located before the Star-Delta connection as in figure 1 and 2 the overload protection shall be adjusted according to the motor full load current at main system voltage

 

When the overload protection is located inside the delta as in figure 3, the overload protection shall be adjusted according to motor full load current at main system voltage divided by 1,732.

 

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2 Replies 2
J_Travostino
Admiral Admiral
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Re: How to calculate overload settings on star delta starters

up ⬆️

 

 

Julien Travostino
Power Distribution & Digital forum community owner
Power Products Div.
MathieuGuillot
Lieutenant Lieutenant
Lieutenant
0
2524

Re: How to calculate overload settings on star delta starters

Hello @Sandile 

 

There are several wiring schemes for star delta motor starters with different location for overload protection: 

 

 Star Delta.png

 

When the overload protection is located before the Star-Delta connection as in figure 1 and 2 the overload protection shall be adjusted according to the motor full load current at main system voltage

 

When the overload protection is located inside the delta as in figure 3, the overload protection shall be adjusted according to motor full load current at main system voltage divided by 1,732.

 

Does it answer your question ?

Tags (1)