Example 8.11. Each line of a 3-phase system is suspended by a string of 3 indentical insulators of self-capacitance Cfarad. The shunt capacitance of connecting metal work of each insulator is 0.2 C to earth and 0-1 C to line. Calculate the string efficiency of the system if a guard ring increases the capacitance to the line of metal work of the lowest insulator to 0.3 C.

Example 8.11. Each line of a 3-phase system is suspended by a string of 3 indentical insulators of self-capacitance Cfarad. The shunt capacitance of connecting metal work of each insulator is 0.2 C to earth and 0-1 C to line. Calculate the string efficiency of the system if a guard ring increases the capacitance to the line of metal work of the lowest insulator to 0.3 C.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.26MCQ: Does r=e14r=0.788r, which comes in calculation of inductance, play a role in capacitance...

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Compensation Techniques

The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. The performance are generally affected by the factors like lag in the compensating devices, slow response of the system of the components like sensors used in the control system. The basic compensation technique involves lag compensation, lead compensation or the combination of the both.

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Example 8.11. Each line of a 3-phase system is suspended by a string of 3 indentical insulators
of self-capacitance C farad. The shunt capacitance of connecting metal work of each insulator is 0.2
C to earth and 0-1 C to line. Calculate the string efficiency of the system if a guard ring increases the
capacitance to the line of metal work of the lowest insulator to 0.3 C.

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Compensation Techniques in Transmission Line

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In an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 15kV and that across the next unit is 12kV. Estimate: ratio of mutual to self-capacitance i. the bus-bar voltage of the substation. Efficiency across the string of insulators ii. iii.
Example 8.10. The self capacitance of each unit in a string of three suspension insulators is C. The shunting capacitance of the connecting metal work of each insulator to earth is 0.15 C while for line it is 0-1 C. Calculate (i) the voltage across each insulator as a percentage of the line voltage to earth and (ii) string efficiency.
i) Calculate V1 and V2 for the voltage across the string insulator having phase voltage of 33kV for transmission line using details tabulated in the Table 3(a). Table 3(a) Type of Insulator Shunt Capacitance between each unit 0.1 C String to junction Self -Capacitance of each insulator ii) With the help of a suitable schematic diagram and necessary theoretical explanation, illustrate how to improve the efficiency of the suspension insulator.
Does r=e14r=0.788r, which comes in calculation of inductance, play a role in capacitance computations? Yes No
4. The value of a at OdegC of a conductor is 1/236 per °C. Find the value of a at 18degC.