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ИДЗ4 англ

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Individual Task. LESSON 4. By

Answer the following questions:

Delta connection

  1. What type of connection was the video about?

  2. What is the name of the current which flows through each conductor?

  3. What is the name of the current which flows through each phase of winding?

  4. Are the phase voltage and the line voltage in delta connection equal?

  5. Do you agree with this relation between phase and line currents in delta connection: ?

Delta to Y conversion

  1. What type of conversion was the video about?

  2. Will these schemes of connection be electrically equivalent or not?

  3. What the easiest way to convert delta connection to Y connection?

  4. Wich resistor of the Y connection is located between resistors R2 and R1 of the delta connection?

  5. 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

  1. On the video showed a delta connection.

  2. The current flowing through each conductor is called the line current.

  3. The current which flows through each phase of winding is called the phase current.

  4. Yes, they are equal.

  5. No this is wrong. I think, that right equation is .

Delta to Y conversion

  1. On the video showed delta to Y conversion.

  2. Yes, these schemes of connection will be electrically equivalent.

  3. It is necessary to write the Y connection from the delta connection and find Ra, Rb, Rc from R1, R2, R3 using special equations.

  4. Between resistors R2 and R1 of the delta connection is located Ra of the Y connection.

  5. The equation for finding of RC resistance size is:

The formula that is shown in the video: .

Can be calculated the size of the resistance Rb by substituting the values of known resistances:

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