blob: 2f2b9706c24aec8bf6a3413f297377066f708db5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART III : SWITCHGEAR AND PROTECTION
// CHAPTER 8: PROTECTION OF ALTERNATORS AND AC MOTORS
// EXAMPLE : 8.4 :
// Page number 625
clear ; clc ; close ; // Clear the work space and console
// Given data
I_min = 0.15 // Minimum pick up current of relay(A)
slope = 12.0 // Slope(%)
CT_ratio = 400.0/5 // CT ratio
I_1 = 360.0 // Current(A)
I_2 = 300.0 // Current(A)
// Calculations
i_1 = I_1/CT_ratio // Current(A)
i_2 = I_2/CT_ratio // Current(A)
percentage = (i_1-i_2)/((i_1+i_2)/2)*100 // Percentage(%)
// Results
disp("PART III - EXAMPLE : 8.4 : SOLUTION :-")
if(percentage>slope) then
printf("\nRelay would trip the circuit breaker, since the point lie on +ve torque regime")
else then
printf("\nRelay would not trip the circuit breaker, since the point do not lie on +ve torque regime")
end
|
