Q2) Actual operating time of an induction type over current relay is 0.9 sec., the fault current 4 KA and C.T. ratio is 400/5. a) Find the current setting, if the time multiplier setting is 0.3. b) Find the plug setting multiplier of the over current relay if the fault current 2000A, current setting 50%, and CT. ratio 400/5. c) Draw a curve between time of operation and plug setting multiplier for TMS 0.5. Fig. below shows the curve between time of operation and plug setting multiplier of a typical relay. 12 10 Operating time (Seconds)- 4 8 6 2 0 2 4 6 8 10 12 14 16 18 20 P.S.M.->
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- Q3. In a % differential scheme, figure shown below, the two CTs have nominal ration of 100:1. The CT errors for a through fault current of 5000 A are as following: CT1 CT2 Ratio error: 10% 10% Phase angle error: 5% -5% Compute following: i) The spill current of the OC relay in the spill path. ii) If the relay is 50% biased, examine whether relay will trip or remain stable CT, CT Ir CB C.B. メx Egu inder NeQ- Select the correct answer: a- The high concentration of holes and electrons in the central junction of a thyristor decreases by the process of ................ during off transient period with a time tar. 1- Forced commutation, 2- Phase commutation, 3- Load commutation, 4- Reverse bias commutation, 5- None of previous. Power Electronics b- The non-trigger voltage of a thyristor is.............. 1- VBO, 2- VBn, 3- VGn, 4- VGD, 5- None of previous. is the limiting positive anode voltage above which thyristor may be damage. 1- PRV, 2- PFV, 3- PAV, 4- PAK, 5- None of previous. C- d- The ripple frequency in the output voltage of single-phase half-controlled bridge AC/DC converter is when a > 60°. 1- 3f, 2-6f, 3- 2f, 4- f, 5- None of previous. ********* e- The integrator in the firing circuit of 1-phase bridge AC/DC converter is necessary to have firing angle range. 1-0-90°, 2-0-120°, 3-0-180°, 4-0-360°, 5- None of previous. f The harmonic contents in an inverter can be reduced through…Describe the basics of power system protection and the role of relays in preventing faults.
- a) Interrelate the core saturation and different characteristics of over-current relay. b) Mention the reason, how the very inverse characteristics of over current relay is obtained if the core is made to saturate at a later stage.What is the purpose of phase failure relays?Discuss the importance of relays in power system protection and fault detection.
- help me in these questions pls write the questions with the and by (Computer) 1-Which of the following statements INCORRECTLY explain the label in the figure about LVDT working principles? a. Secondary coils are connected in series in such a way that their output is opposing each other. b. Constant DC voltage input to primary coil. c. Displacement moves ferrous rod from central position. d. The difference of the output voltage between the two secondary voltage.==========2- Explain the working principle of the measurement system in the figure below.i. Force input that is supplied to the sensor is processed to give the response in the form of raw output signal.ii. Signal conditioner manipulated the weak signal to give a conditioned input.iii. Analog or digital indicator display the unit that gives output reading of quantity being measured.iv. Measured value is compared with the input value for further action. a. ii, iii and iv only. b. i, ii and iv only. c. i, ii and…An overcurrent relay set to operate at 8A is connected to a multi ratio current transformer (whose excitation curve is given in Figure 2 below) with CT ratio =100:5, Zs= 0.082 02 and ZB = 0.8 0. (a) What is the minimum primary current at which the relay will operate? (b) Will the relay detect a 180A fault current on the primary side? (c) Determine whether or not the CT will saturate when the relay current is 8A. Compute the percentage CT error. (d) What is the CT knee voltage poinExplain the importance of fault analysis in power systems and the role of protective relays.
- 9. i)What are full-compensation, under-compensation, and over-compensation of arc suppression coil ground AC system, and why first two options are not applicable in system selection?? ii) What are the applications of load curve and annual load curve in the design and operation of power system? (find answer from website)a- Explain clearly the basic principle of biased differential relay for internal fault and External fault and draw the characteristics for them.Which of the following statements is correct? When a fault occurs, Select one: O A. the generator terminal voltage does not change immediately O B. the field current will not change immediately O C. A small regulation error AV forces the AVR to increase the generator field O D. All of the above