1.A single phasing relay can be used with. d) 150kV – 220kV . 2. d) no relay is used . Admittance Relay. The admittance relay is the most commonly used distance relay. (d) Directional relay. c) 110 kV – 150 kV. This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Satellite Communication Systems”. Which means if the distance Relay senses Impedance less than 25.62 Ohm then it will pick-up for Zone-2. These relays are known as distance relay or impedance relay. a) Impedance type b) MHO type c) Reactance type d) All of these Ans: (b) 7. Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. 1. Explanation:-Distance relay: A relay which measures impedance or a component of the impedance at the relay location is known as a distance relay. An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. Transmission Line Objective Type Questions and answers; 31. Distance Relay. « Back CONTENTS Next » 1. There is one type of relay which functions depending upon the distance of fault in the line. (c) internal short-circuits. It is nondirectional and is used primarily as a fault detector. This impedance or corresponding distance is known as reach of the relay. IDMT relays are used to protect the power transformers against (a) external short-circuits. b) reactance relay. Q8. a) 33 kV – 66 kV. A. Q7. (a) Differential relay. When the power is to be transmitted over a distance of 500 km, the transmission voltage should be in the range. Buchholz relay is used to protect against. Which of the following relay is used to detect and protect internal fault of a transformer? (c) IDMT relay. […] Distance relays are generally. Three phase and three earth fault relays A relay used on long transmission lines is. a) mho’s relay. Multiple Choice Question (MCQ) of Protective Relays page-1. ... Power Electronics mcq power electronics multiple choice questions - 1. Distance relays are generally-- (a) impedance relays (b) reactance relays (c) split-phase relays (d) none of the above . For complete protection of a three-phase transmission line, we require . The impedance relay has a circular characteristic centered at the origin of the R-X diagram. b) 66 kV – 100 kV. It is used for the protection of a transmission line. (d) external short-circuits and overloads. (b) Bucholoz relay. Which means if the distance Relay senses Impedance less than 13.66 Ohm then it will pick-up for Zone-1. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. It is the tripping relay in pilot schemes and as the backup relay in step distance schemes. c) impedance relay. 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