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.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Related questions

Q: Which of the following cannot be said for Channel capacitance? a) All b) it is formed as a result…

Q: Q3(a) In an overhead line, there are THREE units in the string of insulators having phase voltage of…

A: Given, in an overhead line there are three units in the string of insulators, having phase voltage…

Q: Q1) Find the string efficiency of each line of a 3-phase is hung by a 3 strings of insulators. Each…

Q: For a 500-W carrier modulated toa depth of 80%, find the total power and %P.S. in each of the…

Q: Derive the expression for total inductance of a transmission line.

A: According to the question we have to drive the expression for total inductance of a transmission.

Q: Over string of three phase transmission line has a four insulators and Ce=0.12 C. If the voltage…

Q: DISCUSSION QUESTIONS What in. ..metrical snacing of conductors in a 3-phaea trancmicsion line ? 3.…

A: In this question we discuss why do we find line to neutral capacitance in a three phase system ?

Q: 2- If the string is supplied by a guard ring and this lead to add one air capacitance of 0.12C. find…

Q: In a 33 kV overhead line, there are 3 units in the string of insulators. If the capacitance between…

Q: PROBLEM SOLVING NO. 2: A string of suspension consists of four (4) units. The Voltage between each…

Q: Write a report on the Star connection for three phase load experiment using the data/results from…

Q: Over sting of 3- phase tran smission line has 4 insulators and Ce=0.15C. If the voltage between the…

Q: Three Conductors of a 3-phase line are arranged at the corners of a triangle of sides A=2 m, B=2 m,…

A: (a) Given Three phase line are arranged at the corners of a triangle of sides A=2 m, B=2 m,and C=4…

Q: power transmission and distribution subject

A: Capacitance of three core cable- Let take a three core cable. Core to core will be delta connected…

Q: The maximum and minimum stress in the dielectric of a single core cable are 80 kV/cm (rms) and 20…

A: Dielectric of a single core cable- Maximum stress gmax=80 kV/cm (rms) Minimum stress gmin=20 kV/cm…

Q: The value of inductance per conductor in a three-phase line is time(s) the loop inductance for the…

A: As per the guidelines of Bartley we supposed to answer first question since the remaining question…

Q: For transferring electrical power at 220 kV, six conductors of ACSR Drake constitute a 60Hz double…

A: Considering complexity of the solution, we are answering the first t0w subparts, please repost your…

Q: The inductance effect is predominant in underground cables than overhead lines. Select one: True…

A: In this question we have to define inductance effect in cable...

Q: A 300 Km single circuit 30 transposed TL is composed of 2 conductors per phase, with horizontal…

A: In this question, we need to choose the correct options. What is GMR and total inductance .

Q: -Derive and analyse relation of capacitance for 3- core cables [CLO-2,

A: Capacitance of 3 core cables: Let Cc be the capacitance between 2 cores and Ce between core and…

Q: Each line of a 3-phase system given in figure is suspended by a string of 5 identical disks and the…

Q: Three Conductors of a 3-phase line are arranged at the corners of a triangle of sides A=2 m, B=3 m,…

A: Radius of conductor =d2=1.35cm2=0.675cm = 0.675×10-2 m GMR = 0.675×10-2 m because all the radii…

Concept explainers

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.

Question

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.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step by step

Solved in 4 steps with 4 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Compensation Techniques in Transmission Line

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Over sting of 3- phase tran smission line has 4 insulators and Ce=0.15C. If the voltage between the steel pin of the first insulator and the conductor is 25 kV. Find 1- The voltage distribution over the sting and what will be the string efficiency. 2- If the string issslisd by a cuardsing and this lead t de air capacitance of Lize ind the new voltave distribution and the efficienley
Electrical Engineering A 240V single phase circuit is run in conduit in 2 core 70°C PVC/PVC cable having live a) conductor of 2.5 mm (leperating is approximately 20A) and protection conductor cable (cpc) of 1.5 mm If the circuit is protected by 30 HRC fuse, with circuit length of 55 m, and Zg is 0.8 0 EVALUATE whether the initial cip.c. size provided is adequate. Given 2 core PVC/PVC bunched cable impedance is (R +R2) 26.9 m2/m and k -115.
In a string of suspension insulator with three units,the line unit has 12k and k=0.15. The voltage across string is and the efficiency is .?: a. 41.6kV & 69.4kV b. 33.62kV & 74.7% C. 29.52kV & 82% d. 36.9kV & 82%
q3
Enumerate five step-by-step procedure of Mesh analysis method in application to ac electric circuit problem solution or analysis.
Define the string efficiency and calculate its value for a string of three insulator units 33 kV overhead line if the capacitance of each unit to the earth and line be 20% and 5% of the self-capacitance of the unit. Drive any formula that might be used.
2.5 A 3-phase single circuit bundled conductor line with two sub-conductors per phase has horizontal spacing with 6.1 m between the centre lines of adjacent phases. The distance between the sub- conductors of each phase is 30.5 cm and each sub-conductor has a diameter of 2.54 cm. Find the inductance per phase per km. [0.988 mH]
In an overhead line, there are three units in the string of insulators having line voltage of 33kV. If the shunt capacitance between each insulator pin and earth is 0.11 times than self-capacitance of each insulator, (i) Calculate the distribution of voltage over 3 insulators. (ii) Explain to how to make uniform voltages
Electrical Engineering a) A 240V single phase circuit is run in conduit in 2 core 70°C PVC/PVC cable having live conductor of 2.5 mm? (Ioperating is approximately 20A) and protection conductor cable (cpc) of 1.5 mm?. If the circuit is protected by 30 HRC fuse, with circuit length of 55 m, and ZE is 0.8 2. EVALUATE whether the initial c.p.c. size provided is adequate. Given 2 core PVC/PVC bunched cable impedance is (R1 + R2) = 26.9 m2/m and k = 115.