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Subject Name: POWER SYSTEMS-II Prepared By: Paresh R. Modha Asst. Professor, CSPIT, Changa. Topic Name : D.C. Distribution.

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Presentation on theme: "Subject Name: POWER SYSTEMS-II Prepared By: Paresh R. Modha Asst. Professor, CSPIT, Changa. Topic Name : D.C. Distribution."— Presentation transcript:

1 Subject Name: POWER SYSTEMS-II Prepared By: Paresh R. Modha Asst. Professor, CSPIT, Changa. Topic Name : D.C. Distribution Systems

2 DC Distribution Systems  For certain applications, d.c. supply is absolutely necessary. For example, d.c. supply is required for the operation of variable speed machinery (e.g. DC motors), electrochemical work and electric traction.  Types of DC Distribution Systems are :  (i) Distributor fed at one end  (ii) Distributor fed at both ends  (iii) Distributor fed at the centre  (iv) Ring distributor.

3 Distributor Fed at one End

4 Distributor Fed at Two (both) End

5 ( ii) Two ends fed with unequal voltages.

6 Example : 1 Ex. :1 : A 2-wire d.c. street mains AB, 600 m long is fed from both ends at 220 V. Loads of 20 A, 40 A, 50 A and 30 A are tapped at distances of 100m, 250m, 400m and 500 m from the end A respectively. If the area of X-section of distributor conductor is 1cm2, find the minimum consumer voltage. Take ρ = 1·7 × 10−6 Ω cm.

7 Solution of Ex : 1

8 Contd…

9 Example : 2

10 Solution :

11 Contd…

12 Contd..

13 Distributor Fed at Centre :  In this type of feeding, the centre of the distributor is connected to the supply mains as shown in Fig. It is equivalent to two singly fed distributors,  each distributor having a common feeding point and length equal to half of the total length.

14 Example : 3

15 Solution :

16 Ring mains Distributor systems :  In this type, the distributor is in the form of a closed ring as shown in Fig. It is equivalent to a straight distributor fed at both ends with equal voltages, the two ends being brought together to form a closed ring. The distributor ring may be fed at one or more than one point. each distributor having a common feeding point and length equal to half of the total length.

17 Example : 4 : A 2-wire D.C. Ring distributor is 300 m long and is fed at 240 V at point A. At point B, 150 m from A, a load of 120 A is taken and at C, 100 m in the opposite direction, a load of 80 A is taken. If the resistance per 100 m of single conductor is 0.03 Ω, find : ( i) current in each section of distributor (ii) voltage at points B and C Solution :

18 Contd….

19 Actual Representation :

20 HOME WORK Example : (Self Study)

21 [1]M. V. Despande, “Electrical Power System Design”, TMH Publication, New Delhi. [2] V. K. Mehta, “Principle of Power Systems”, S. Chand Publications. [3]B.R. Gupta, “Power System analysis and Design”, S. Chand Publications. References

22 Questions 22 Thank You.. for Your Attention..! Prepared By: Paresh R. Modha Asst. Professor, CSPIT, Changa.


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