ИДЗ4 англ
.docxIndividual Task. LESSON 4. By
Answer the following questions:
Delta connection
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What type of connection was the video about?
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What is the name of the current which flows through each conductor?
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What is the name of the current which flows through each phase of winding?
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Are the phase voltage and the line voltage in delta connection equal?
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Do you agree with this relation between phase and line currents in delta connection: ?
Delta to Y conversion
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What type of conversion was the video about?
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Will these schemes of connection be electrically equivalent or not?
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What the easiest way to convert delta connection to Y connection?
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Wich resistor of the Y connection is located between resistors R2 and R1 of the delta connection?
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Write the equation for finding of RC resistance size. R1 is 6 (ῼ), R2 is 10 (ῼ) and R3 is 4 (ῼ). Find the size of RB resistance according to the circuit on the second video and write it in the answer.
Answers:
Delta connection
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On the video showed a delta connection.
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The current flowing through each conductor is called the line current.
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The current which flows through each phase of winding is called the phase current.
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Yes, they are equal.
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No this is wrong. I think, that right equation is .
Delta to Y conversion
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On the video showed delta to Y conversion.
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Yes, these schemes of connection will be electrically equivalent.
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It is necessary to write the Y connection from the delta connection and find Ra, Rb, Rc from R1, R2, R3 using special equations.
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Between resistors R2 and R1 of the delta connection is located Ra of the Y connection.
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The equation for finding of RC resistance size is:
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The formula that is shown in the video: .
Can be calculated the size of the resistance Rb by substituting the values of known resistances: