The pickup value is For complete protection of a three-phase transmission line, we require . (b) Bucholoz relay. The impedance relay has a circular characteristic centered at the origin of the R-X diagram. (b) overloads. Which means if the distance Relay senses Impedance less than 13.66 Ohm then it will pick-up for Zone-1. Distance Relay. Which means if the distance Relay senses Impedance less than 25.62 Ohm then it will pick-up for Zone-2. (c) internal short-circuits. Distance relays are generally-- (a) impedance relays (b) reactance relays (c) split-phase relays (d) none of the above . The admittance relay is the most commonly used distance relay. This impedance or corresponding distance is known as reach of the relay. b) reactance relay. d) no relay is used . d) 150kV – 220kV . Q7. c) 110 kV – 150 kV. a) 33 kV – 66 kV. Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. ... Power Electronics mcq power electronics multiple choice questions - 1. These relays are known as distance relay or impedance relay. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. (c) IDMT relay. An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. (a) Differential relay. 1. b) 66 kV – 100 kV. a) mho’s relay. Multiple Choice Question (MCQ) of Protective Relays page-1. There is one type of relay which functions depending upon the distance of fault in the line. a) Impedance type b) MHO type c) Reactance type d) All of these Ans: (b) 7. Distance relays are generally. A relay used on long transmission lines is. Q6. (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. It is the tripping relay in pilot schemes and as the backup relay in step distance schemes. 2. When the power is to be transmitted over a distance of 500 km, the transmission voltage should be in the range. Q8. (d) external short-circuits and overloads. A. Which of the following relay is used to detect and protect internal fault of a transformer? 1.A single phasing relay can be used with. It is used for the protection of a transmission line. Transmission Line Objective Type Questions and answers; 31. 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. Buchholz relay is used to protect against. Reach is the limiting distance covered by the relay for protection of line. Three phase and three earth fault relays « Back CONTENTS Next » 1. In the same manner, Setting for Zone-2 = (150% of 61) × CT/PT ratio = 1.5×61×0.28 = 25.62 ohm. 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