Engineering, 17.06.2021 21:00 Senica
A distance relaying system utilizing a CT with a turns ratio of 500:5 and a PT with a turns ratio of 20KV:69.3V. The lines AB and BC shown in Fig. has an impedance of (0.03+j0.4)2/Km, the lengths of lines AB and BC are100)Km and 80 Km. a) Find each zone settings of both relays Rab and Rbc then find the response times of main and backup protection for a symmetrical short circuit at 90% of line BC. b) What difference will happen in the tripping time of both relays if the fault occurred through an impedance of (1.2+j20)2 (A4) (10 Marks) B 801e m Rab 100 km Rbc Fig.1
Answers: 3
Engineering, 04.07.2019 18:10
An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet
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Engineering, 04.07.2019 18:10
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
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Engineering, 04.07.2019 18:10
Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines
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Engineering, 04.07.2019 18:10
Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges
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A distance relaying system utilizing a CT with a turns ratio of 500:5 and a PT with a turns ratio of...
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