(a) Briefly explain what is the per-unit systerm. (b) A resistance of 60n is selected as the bese resistance in a circuit consists of three resistors. If R, = 1002 R, =3000n and R3 = 202 calculate the per-unit value of each resistance. %3D (c) A power of, P-25KW and a voltage of, E-2400V are selected as the base power and base voltage of a power system respectively. Calculate the value of the base impedance, Z, and the base current, I,

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Question 3
(a) Briefly explain what is the per-unit systero.
(b) A resistance of 60n is selected as the base resistance in a circuit
consists of three resistors. If R, =1002, R, =30002 and
%3D
R, = 200 calculate the per-unit vahue of each resistance.
%3D
(c) A power of, P-25KW and a voltage of, E-2400V are selected
as the base power and base voltage of a power system respectively.
Calculate the value of the base impedance, Z, and the base
current, I,.
(d) A resistor bas a per-nnit value of 5.3. Given the base power is
P=250KW, and the base voltage is E,-12470V, calculate the
ohmic value (actual value) of the resistor.
(e) A 4000 resistor caries a cucrent of 60A. Given the base valne of
voltage, E, 4KV, the base value of power, P, 500KTF, the
base value of current, I, =125.4, and the base value of resistor,
2, = 320 calculate the following:
i The per-unit resistance.
ii. The per-unit current.
ii. The per-unit voltage across the resistor.
iv. The per-unit power.
Transcribed Image Text:Question 3 (a) Briefly explain what is the per-unit systero. (b) A resistance of 60n is selected as the base resistance in a circuit consists of three resistors. If R, =1002, R, =30002 and %3D R, = 200 calculate the per-unit vahue of each resistance. %3D (c) A power of, P-25KW and a voltage of, E-2400V are selected as the base power and base voltage of a power system respectively. Calculate the value of the base impedance, Z, and the base current, I,. (d) A resistor bas a per-nnit value of 5.3. Given the base power is P=250KW, and the base voltage is E,-12470V, calculate the ohmic value (actual value) of the resistor. (e) A 4000 resistor caries a cucrent of 60A. Given the base valne of voltage, E, 4KV, the base value of power, P, 500KTF, the base value of current, I, =125.4, and the base value of resistor, 2, = 320 calculate the following: i The per-unit resistance. ii. The per-unit current. ii. The per-unit voltage across the resistor. iv. The per-unit power.
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