Reach is the limiting distance covered by the relay for protection of line. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. Q7. These relays are known as distance relay or impedance relay. Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. For complete protection of a three-phase transmission line, we require . An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. A relay used on long transmission lines is. Distance relays are generally-- (a) impedance relays (b) reactance relays (c) split-phase relays (d) none of the above . Q6. The satellite that is used as a relay to extend communication distance is called as _____ a) Relay satellites b) Communication satellites c) Repeater satellites … (c) IDMT relay. The admittance relay is the most commonly used distance relay. Buchholz relay is used to protect against. IDMT relays are used to protect the power transformers against (a) external short-circuits. It is nondirectional and is used primarily as a fault detector. Transmission Line Objective Type Questions and answers; 31. (c) internal short-circuits. Which means if the distance Relay senses Impedance less than 25.62 Ohm then it will pick-up for Zone-2. (d) Directional relay. Explanation:-Distance relay: A relay which measures impedance or a component of the impedance at the relay location is known as a distance relay. In the same manner, Setting for Zone-2 = (150% of 61) × CT/PT ratio = 1.5×61×0.28 = 25.62 ohm. The impedance relay has a circular characteristic centered at the origin of the R-X diagram. a) 33 kV – 66 kV. 1. A. Multiple Choice Question (MCQ) of Protective Relays page-1. d) no relay is used . c) 110 kV – 150 kV. The pickup value is 24. It is used for the protection of a transmission line. Admittance Relay. ... Power Electronics mcq power electronics multiple choice questions - 1. This impedance or corresponding distance is known as reach of the relay. (d) external short-circuits and overloads. There is one type of relay which functions depending upon the distance of fault in the line. Which means if the distance Relay senses Impedance less than 13.66 Ohm then it will pick-up for Zone-1. (a) Differential relay. It is the tripping relay in pilot schemes and as the backup relay in step distance schemes. Which of the following relay is used to detect and protect internal fault of a transformer? « Back CONTENTS Next » 1. c) impedance relay. Distance Relay. Distance relays are generally. 1.A single phasing relay can be used with. Three phase and three earth fault relays a) mho’s relay. b) 66 kV – 100 kV. (b) overloads. Q8. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. b) reactance relay. 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