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The infinite bus in Figure-2 shown below operates at 480V. Load 1 is an induction motor consuming U kW at 0.78 PF lagging, load 2 is an induction motor consuming V kW at 0.8 PF lagging, Load 3 is a synchronous motor whose real power consumption is W kW and Load 4 is a synchronous motor whose real power consumption is X kW. a) If the both synchronous motors are adjusted to operate at 0.85 PF lagging, Compute the transmission line current in this system? b) If the first synchronous motor (150 kW) is adjusted to operate at 0.85 PF leading and other operate at 0.85 Lagging PF Compute the transmission line current in this system? c) If both synchronous motors are adjusted to operate at 0.85 PF leading Compute the transmission line current in this system?

The infinite bus in Figure-2 shown below operates at 480V. Load 1 is an induction motor consuming U kW at 0.78 PF lagging, load 2 is an induction motor consuming V kW at 0.8 PF lagging, Load 3 is a synchronous motor whose real power consumption is W kW and Load 4 is a synchronous motor whose real power consumption is X kW. a) If the both synchronous motors are adjusted to operate at 0.85 PF lagging, Compute the transmission line current in this system? b) If the first synchronous motor (150 kW) is adjusted to operate at 0.85 PF leading and other operate at 0.85 Lagging PF Compute the transmission line current in this system? c) If both synchronous motors are adjusted to operate at 0.85 PF leading Compute the transmission line current in this system?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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The infinite bus in Figure-2 shown below operates at 480V. Load 1 is an induction motor consuming U kW at 0.78 PF lagging, load 2 is an induction motor consuming V kW at 0.8 PF lagging, Load 3 is a synchronous motor whose real power consumption is W kW and Load 4 is a synchronous motor whose real power consumption is X kW. a) If the both synchronous motors are adjusted to operate at 0.85 PF lagging, Compute the transmission line current in this system? b) If the first synchronous motor (150 kW) is adjusted to operate at 0.85 PF leading and other operate at 0.85 Lagging PF Compute the transmission line current in this system? c) If both synchronous motors are adjusted to operate at 0.85 PF leading Compute the transmission line current in this system? d) Assume that the transmission line losses are given by line loss P = 31R. where LL stands for line losses. Compare the transmission losses in the three cases? U = 70 + Last two Digits of your SAP ID V = 150 + Last two Digits of your SAP ID Page 5 of 8 L W = 100 + Last two Digits of your SAP ID X = 20 + Last two Digits of your SAP ID Ukw 0.78 PF Ind. motor lagging P VkW 0.8 PF Ind. Infinite bus Transmission line motor lagging Synchr. Wkw motor PF = ? Plant P4 Synchr. XkW PF-? motor Q4
Transcribed Image Text:The infinite bus in Figure-2 shown below operates at 480V. Load 1 is an induction motor consuming U kW at 0.78 PF lagging, load 2 is an induction motor consuming V kW at 0.8 PF lagging, Load 3 is a synchronous motor whose real power consumption is W kW and Load 4 is a synchronous motor whose real power consumption is X kW. a) If the both synchronous motors are adjusted to operate at 0.85 PF lagging, Compute the transmission line current in this system? b) If the first synchronous motor (150 kW) is adjusted to operate at 0.85 PF leading and other operate at 0.85 Lagging PF Compute the transmission line current in this system? c) If both synchronous motors are adjusted to operate at 0.85 PF leading Compute the transmission line current in this system? d) Assume that the transmission line losses are given by line loss P = 31R. where LL stands for line losses. Compare the transmission losses in the three cases? U = 70 + Last two Digits of your SAP ID V = 150 + Last two Digits of your SAP ID Page 5 of 8 L W = 100 + Last two Digits of your SAP ID X = 20 + Last two Digits of your SAP ID Ukw 0.78 PF Ind. motor lagging P VkW 0.8 PF Ind. Infinite bus Transmission line motor lagging Synchr. Wkw motor PF = ? Plant P4 Synchr. XkW PF-? motor Q4
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