Bài giảng Electrical and electronic principles: Chương 3 - ThS. Ngô Quốc Cường

Bài giảng Electrical and electronic principles - Chương 3 gồm có những nội dung chính sau: T, Y, delta networks; network of complex impedance; maximum power transfer. Mời các bạn cùng tham khảo để biết thêm chi tiết.

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CONTENTS (Today)

• T, 𝜋, Y, delta networks

• Network of complex impedance

• Maximum power transfer

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1 T, 𝜋, Y, delta networks

• Two forms of the same network – Y, T

• Two forms of the same network – ∆, 𝜋

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1 T, 𝜋, Y, delta networks

• Delta to Wye conversion

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1 T, 𝜋, Y, delta networks

• Wye to Delta conversion

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1 T, 𝜋, Y, delta networks

• Convert the network in the figure below to an equivalent Y

network

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1 T, 𝜋, Y, delta networks

• Answer

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1 T, 𝜋, Y, delta networks

• Transfer the wye network to delta network

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1 T, 𝜋, Y, delta networks

• Answer

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1 T, 𝜋, Y, delta networks

• Obtain the equivalent resistance Rab for the circuit in Figure

below and use it to find current i

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1 T, 𝜋, Y, delta networks

• Answer: R = 9.63 Ω

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1 T, 𝜋, Y, delta networks

• Answer: R = 9.63 Ω

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2 Network of complex impedance

• Sinusoids

• Phasor

– A phasor is a complex number that represents the

amplitude and phase of a sinusoid

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2 Network of complex impedance

• A complex number can be expressed in 3 ways

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2 Network of complex impedance

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2 Network of complex impedance

• The impedance Z of a circuit is the ratio of the phasor voltage

V to the phasor current I, measured in ohms

• The admittance Y is the reciprocal of impedance, measured

in siemens (S)

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2 Network of complex impedance

• Find v(t) and i(t) in the circuit

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2 Network of complex impedance

• Answer

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2 Network of complex impedance

• Exercise 2.1

• Find the input impedance of the circuit Assume that the

circuit operates at 𝜔 = 50 𝑟𝑎𝑑/𝑠

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2 Network of complex impedance

• Answer

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2 Network of complex impedance

• Exercise 2.2

• Determine vo(t) of the circuit

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2 Network of complex impedance

• Answer

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2 Network of complex impedance

• Steady state analysis

– Mesh analysis

– Thevenin and Norton equivalent circuit

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2 Network of complex impedance

• Exercise 2.3

• Find Io using mesh analysis

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2 Network of complex impedance

• Answer:

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2 Network of complex impedance

• Exercise 2.4

• Solve for Vo using mesh analysis

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2 Network of complex impedance

• Answer

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2 Network of complex impedance

• Exercise 2.5

• Obtain the Thevenin equivalent circuit at terminal a-b

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2 Network of complex impedance

• Answer

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