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Note for Power System-2 - PS-2 By JNTU Heroes

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LECTURE NOTES ON POWER SYSTEMS-II III B. Tech I semester (JNTUH-R13) COMPUTER SCIENCE AND ENGINEERING

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UNIT NO UNIT PAGE NO 1 Transmission Line Parameters 02 2 Performance of short and Medium Length Transmission lines Performance of long transmission line 15 3 Power system transients 27 4 Various factor governing tha Performance of line 32 5 Overhead line Insulators 42

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UNIT-I TRANSMISSION LINE PARAMETERS DEPARTMENT OF EEE-IARE Page 2

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2. TRANSMISSION LINES Tha electric parameters of transmission lines (i.e. resistance, inductance, and capacitance) can be determined from tha specifications for tha conducters, and from tha geometric arrangements of tha conducters. 2.1 Transmission Line Resistance Resistance to d.c. current is given by  R dc A where is tha resistivity at 20o C is tha length of tha conducter A is tha cross sectional area of tha conducter Because of skin effect, tha d.c. resistance is different from ac resistance. Tha ac resistance is referred to as effective resistance, and is found from power loss in tha conducter R power loss I2 Tha variation of resistance with temPerature is linear over tha normal temPerature range resistance ( ) R2 R1 T T1 T2 o temPerature ( C) Figure 9 Graph of Resistance vs TemPerature (R1 (T1 0) T) (R 2 (T2 0) T) DEPARTMENT OF EEE-IARE Page 3

Lecture Notes