power system protection important questions

Typically, the different attributes for a file structure are naming, identifier, supported file types, and location for the files, size, and level of protection. Best Videos, Notes & Tests for your Most Important Exams. Power distribution system deals with transmission of electric power from generating station to the loads with the use of transmission and distribution substations. D. None of the above View Answer. The main … The three-phase induction motors are self-starting and more efficient whereas the single-phase motor is not self-starting and requires an auxiliary means for the start of motor. Which of the following bar schemes is the most expensive? Therefore fault clearance time is the sum of relay operating time and circuit breaker operating time and clearing the fault. A. For the continuity of the power system, it is necessary that they should maintain perfect synchronism under all steady state conditions. Whenever abnormal conditions occur, the relay close its contacts. Surge Harmonics Frequency Variations . The relays that are usually employed for protection of transmission lines include. February 20, 2019 Lauren Simmen Jump to Comments Demand for home technology is growing, and homeowners might start with a trial DIY security experience. Actually circuit breaker isolates the faulty system from rest of the healthy system and these circuit breakers automatically open during fault condition due to its trip signal which comes from protection relay. Some of the good features for protective relaying are: Reliability, Selectivity, Sensitivity, Simplicity, Speed and economy. 41! With the frequency and severity of power interruptions on the rise, many such facilities are opting to install power protection systems to safeguard equipment and maintain productivity even under extreme power conditions. 1.8 Various Power System Elements That Need Protection 23 1.9 Various Principles of Power System Protection 23 Reuiew Questions 24 Problems 25 2 OVER-CURRENT PROTECTION OF TRANSMISSION LINES 26-56 2.1 Introduction 26 2 2 Fuse 26 2.3 Thermal Relays 27 2.4 0; er-current Relay 28 2.4.1 Instantaneous OC Relay 29 Electrical faults are also caused because of human errors such as selecting an improper rating of equipment, switching the circuit while it is under servicing etc. Please mail your requirement at hr@javatpoint.com. Whenever a fault occurs in a system, the protective relay operates and signals … In this article, you will learn the importance of protection in the modern power system and why we need power system protection. HVDC & SVC . Electrical Power System Components . Circuit breakers are essentially. Importance of stability analysis in power system planning and operation - classification of power system stability - angle and voltage stability – Single Machine Infinite Bus (SMIB) system: Development of swing equation - equal area criterion - determination of critical clearing angle and time – solution of swing equation by modified Euler method and Runge-Kutta fourth order method. The relays are compact, self-contained devices, which respond to abnormal conditions. The protection is organized to provide a ring of security around each and every element of power system. Unit 3. It is an electrical device designed to initiate the isolation of a part of the electrical installation, or to operate an alarm signal, in the event of abnormal condition or a fault. Step -1 Get your basics clear. Due to which of the following reasons aluminium is being favoured as bus-bar material? Thermal models in power system protection free download SE Zocholl, A Guzmán ,26th Annual Western Protective Relay , 1999 ,selinc.com ABSTRACT System protection engineers are familiar with I 2 t thermal limitations specified for transformers, motors or generators. Electrical grounding or merely grounding is a safety measure used to prevent people accidentally coming in contact with the hazardous electrical faults. What are the different relays that employed for protection of apparatus and transmission lines? Schimmelsanierung [eco] ist immer die richtige Wahl. Link: Unit4 Notes. Introduction. An industrial consumer hall a daily load pattern of 2000 KW, 0.8 lag for 12 Hra and 1000 kW UPF for 1J Hr. The method that uses the load flow analysis is as follows: JavaTpoint offers too many high quality services. Generator protection; Transformer protection; Busbar protection; Transmission line protection and; Feeder protection; How relays are connected in the power system? II. Reduces current for a given output. Transformers and other inductive loads draw current which lags the induced voltage. Fundamentals of Power System Protection by Paithankar and S.R.Bhide.,PHI, 2003; Art & Science of Protective Relaying – by C R Mason, Wiley Eastern Ltd. Link:3 Notes. Q.1. For the proper functioning of the electrical system back up protection is essential. Where the value of surface irregularity factor μ for a different surface condition is as follows: A slack bus also known as reference bus or swing bus balances the active and reactive power of the system. DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING When the fault occurs on the bus bar, then the whole of the supply gets interrupted, and all the feeders are disconnected in this case Busbar protection is provided to the system to eliminate the occurrence of these faults. Some previous year questions are taken and topics related those are explained. Electrical4U’s MCQs are in a wide range of electrical engineering subjects including analog and digital communications, control systems, power electronics, electric circuits, electric machines – and much more. Book Name – A Course In Power Systems By JB Gupta Author – J B Gupta Publisher – Katson Books Language – English Paperback – 550 Pages How the electrical power system protection is divided? Anna University Regulation 2013 EEE EE6501 PSA Important Questions with Answer Key for all 5 units and EEE 5th SEM EE6501 Power System Analysis Answer Key is listed down for students to make perfect utilization and score maximum marks with our study materials. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Unit 2. What do you mean by sag in transmission line? Sub. How the electrical power system protection is divided? Created by the Best Teachers and used by over 51,00,000 students. The main philosophy about protection is that no protection of power system can prevent the flow of fault current through the system, it only can prevent the continuation of flowing of fault current by quickly disconnect the short circuit path from the system. Answer Explanation ANSWER: Both (a) and (b) Explanation: No explanation is available for this question! The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. 39! Rejinpaul Nov Dec 2019 Important Questions UG PG Anna … Faults beyond the distance (reach of the relay) relay will not operate and should be covered by the other relay. The objective of using this scheme is to keep power system stable and leaving the network still during operation. power system protection, Consistent protection across all protection levels, thanks to coordinated protective devices; Space-saving and inexpensive installation, thanks to slim design; Know what's happening in advance, thanks to the predictive testing of the pluggable protective devices; Surge protection for power supplies is part of the COMPLETE line system Power System Interview Questions and Answers. interrupts the powers supply and damages the damages the electrical installations. Directional Relays 42! Developed by JavaTpoint. 20! This ring of security is called ‘Zone of protection’. a) 4 kV b) 25 kV c) 10 kV d) 36 kV Ans: (d) 3. Power System Interview Questions. 19! Power System Analysis Notes pdf – PSA pdf notes – PSA notes pdf file to download are listed below please check it – Power System Analysis Book. A bundle conductor consists of two or more parallel subconductors at a spacing of several diameters. Power system protection is a powerful engineering branch that deals with electrical system protection. Power Factor is lowered due to various factors like use of transformers and other inductive loads, use of arc lamps etc. Tag: multiple choice questions in power system protection Power System Protection and Relays Questions & Answers S Bharadwaj Reddy April 25, 2016 September 11, 2016 Examples of protection relays – Micom, Ref and Siprotec. Question2: What are internal and external faults? 3) A fuse wire of circular cross section has a radius of 0.8mm. © Copyright 2011-2018 www.javatpoint.com. Unit 5. Anna University Regulation 2013 EEE EE6501 PSA 2marks 16marks for all 5 units and EE6501 PSA Short answers, Question Bank for Power System Analysis are listed down for students to make perfect utilization and score maximum marks with our study materials.. Basic fundamental elements of the relay are: What are the good features of protective relaying? Primary reason for relay failure to operate during faults are wrong settings, bad contacts and open circuit in the relay coil. It is fair to say that without discriminative protection it would be impossible to operate a modern power system. Adjacent zone of protection overlap because if we do not overlap then some portion of the power system will be left out unprotected. Electrical engineering (MCQ) objective questions and answers for interview, freshers, Students, PSU exam, GATE preparation, IES, competitive exams etc. In this, the corona discharge means the current discharge in the air. C. Ease of fabrication . Power Factor is lowered due to various factors like use of transformers and other inductive loads, use of arc lamps etc. Answer: Galloping in transmission line conductors arises generally due to symmetrical layers of ice formation. The generation, distribution, and transmission system together constitute a network called as Power plant. Why Power Protection Is Important for Security Systems Security system installers must consider all the factors impacting success of a system to provide a more comprehensive value to clients. Comment. We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. The difference between the relay and the circuit breaker is that relay is a switching device that gives the signal to the circuit breaker in case of fault occurrence, whereas circuit breaker breaks the circuit automatically when receives the signal. 22! Link: Complete Notes. Action carried out by the relay and circuit breaker during fault condition? Over-Current Protection 38! a. Electro positive b. Electro negative c. Both (a) and (b) d. None of these. The overall system protection is divided into. Over voltage relay meant for sensing over voltages & protect the system from insulation break down and firing. Power System Protection & Control IEEE PES Distinguished Lecturer Program Preceding IEEE PES Vice President for Chapters melihas@ieee.org PES Student Energy Conference (ZEC 2015), Zagreb, Dec 10th, 2015 1. Important Questions provided here are the Expected questions that are possible to be appeared in the upcoming exams.you can make use of the below questions and prepare for your exams. Security. Answer on first question: Functions of a protective relay: The protective relaying senses the abnormal conditions as a part of the power system and gives an alarm or isolate that part from the healthy system. Often at really high power levels the battery will take up a full room, and certainly more floor space than the UPS system it supports. Increases losses in line. 32) What is root partition? This impedance or corresponding distance is known as reach of the relay. We can use the fuses only once but circuit breakers can be used many more times, and the breaking capacity of the fuse is low as compared with the circuit breaker. This is module three part 3 of our Fundamentals of Modern Protective Relaying introducing Power Systems Protection. Important Questions provided here are the Expected questions that are possible to be appeared in the upcoming exams.you can make use of the below questions and prepare for your exams. D. Both b and c. Ans: D. Q.9 Improving power factor-A. The relay should be sensitive enough to respond to the smallest fault, therefore, the pickup value should be less than the smallest fault current. For removing the faults the entire circuits connecting the faulty section needs to be open. This causes huge amount of current to be drawn as the reactive power increases and the power … Power Systems Multiple Choice Questions and Answers, Power Systems Online Quiz Questions, GATE Exam Preparation Questions 1. Some topics which are covered in this course are: Distance Relays, RRRV and Recovery Voltage in CB, PSM and TMS etc.Various topics like resistance switching and previous year questions will be added soon. Internal faults are the faults that occur inside the zone and external faults are the faults that occur outside the zone of protection. QUESTION #4 What voltage would you read if you placed your leads from L1, L2, or L3 to ground of a 460-volt AC, three-phase power system, Y-connected? D. None. 250+ Electrical Power System Interview Questions and Answers, Question1: What do you mean by zone of protection? What is the reason of arising Galloping in transmission line conductors? The objective of power system protection is to isolate a faulty section of electrical power system from rest of the live system so that the rest portion can function satisfactorily without any severe damage due to fault current. Must book for power system courses. Electro-magnetic attraction and electro-magnetic induction. 43! • By dividing the power system into protection zones the extent of disconnections can be limited . In the three-phase system, the power delivered is constant whereas the power delivered in the single-phase system is pulsating in nature. Save my name, email, and website in this browser for the next time I comment. 3. Power system comes into existence with the growing demand of electrical energy. Torque is developed by electromagnetic induction principle. Bulk oil circuit breaker is suitable for voltages upto. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). At higher power levels it is common to find more conventional wet-cell batteries in use. Generator Protection Interview Questions & Answers, Electrical Cables Interview Questions & Answers, Methods to Reduce Step Potential and Touch Potential in Substation, What is the function of a relay in power systems, question bank for protective relays exam with solved problems, power system protection question and answers pdf, protective relay and circuit breaker interview question, POWER SYSTEM PROTECTION QUESTION AND ANSWER PDF, what is torque control in protective relay. The generation, distribution, and transmission system together constitute a network called as Power plant. See instructions. If the Y-connected system is solidly grounded, you will read 266V from line to ground. The difference between Fuse and a circuit breaker is that fuse works on the principle of the thermal and electrical properties of the conducting materials, whereas the circuit breaker works on the principle of electromagnetism and switching principle. B. Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. The difference between electrical earthing and electrical grounding is that in grounding the current carrying part is connected to the ground, whereas in earthing the non-current carrying part is connected to the ground. Low-cost . Discrimination by Time 40! Search for: Related. In case of electro-magnetic induction, principle of operation is similar to induction motor. Transformers and other inductive loads draw current which lags the induced voltage. Depending upon the voltage and length of the conductor the classification of the transmission line is as follows: The Relay is an automatic device that senses the abnormal condition of the electrical circuit and closes its contact. Achieving Selectivity . Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. Ravindranath, M.Chander, “Power System Protection and SwitchGear”, Wiley Eastern Ltd. New Delhi [3]. Phenomena . What are the fundamental elements of relay? 3. The advantages of the three-phase transformer over a single-phase transformer are as follows: The minimum phase to a neutral voltage that is required for corona discharge to start is called the Critical disruptive voltage. But whenever a fault occurs on a power system, heavy currents flow and if the system is not isolated then it causes damage and the supply of other systems, which are not connected to the faulty system, also gets affected. Answer: The transmission line is not fully stretched but it is allowed to sag down. 1. The effect of this will be circuit breaker operate to open the contacts. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Economic Operation of Power Systems. 1.0.2 CAUSES OF POWER SYSTEM FAULTS Over current relay meant for sensing any internal short circuit, over load condition ,earth fault thereby reducing the system failure & risk of fire.So, for a better protection of the system.It should have both over voltage & over current relay. Primary protection also known as main protection is the first line of protection which provides quick acting and clearing of the fault within the boundary of the elements it protects. Objective Type Question or MCQ of Power System Protection page-1. As a precautionary measure, addition protection is generally provided and is called Backup Protection.In this post, we will look into the difference between primary & backup protection, advantages of backup protection, and methods of backup protection. How the electrical power system protection is divided? Busbar Protection | Busbar Protection Objective Type Questions and answers. Backup Protection Zones . (a) 0.5 (b) 0.75 (c) 0.6 (d) 2.0 Ans: c After the relay sensing the fault condition, relay operates and close the trip coils. Different types of protection for electrical systems and networks. 1.In a circuit breaker, are is initiated by the process of. Step -1 Get your basics clear. Sunil S.Rao, “Switch Gear and Protection”, Khanna Publication . Protections must isolate only the faulted equipment, with no over-tripping of unaffected … We have the largest collection of Instrumentation Engineering Multiple Choice Questions (MCQ) to prepare for the Competitive examination. In this project you will consider the important problem of minimizing the cost of producing a given amount of electrical power from a group of non-identical generators. The pickup value of the relay should be more than the maximum load and it should allow the normal load as well as the certain degree of overload to be supplied. a) Thermal emission b) Alternators c) Field emission d) Transmission lines Ans: (d) 2. This system consists of group of generation systems. It also contains other potentially important system files that are mounted during boot time. Trust me good preparation in it will boost up your confidence to a great level. Discrimination by Time & Current . The slack bus serves as angular reference for all the buses in the system. If there is any fault associated within the ring the relays associated with it must trip all the allied circuit breakers so as to remove any faulty element from rest of the power system. That is why automatic switch gears are needed for the protection of generators and lines. Earthing protects the persons and apparatus from the high voltage surges and lightning discharge. 21! Power System Stability Power system consists some synchronous machines operating in synchronism. Overlapping protection zones 36! Earthing protects the person from the short circuit current. What are different types of principles of operation of electro-mechaical relays? Enter your email address to comment. When the insulation of the system fails at one or more points or a conducting object comes into contact with a live point, a short circuit or a fault occurs. Question3: What do you mean by reach and reach point of the relay? The protection is provided in the system to protect each and every element of the power system. 37! JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. The arcing ground risk is decreased by the resistance grounding and permits the ground fault protection, whereas resistance earthing system is provided in electric equipment to protect the equipment from the occurrence of the fault in the system. 18! The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. Low-cost Your Comments. An example of a power system is the electrical grid that provides power to homes and industry within an extended area. In simple words relay is an electrical device that gives signal to isolation device (eg: Circuit Breaker) after sensing the fault and helps to isolate the fault system from the healthy electrical system. Malfunctioning, aging, insulation failure of cables and winding leads to failure of equipment like generators, motor, transformer. In electromagnetic attraction relay plunger is drawn to the solenoid or an armature is attracted to the poles of the electromagnet. Electrical4U’s MCQs are in a wide range of electrical engineering subjects including analog and digital communications, control systems, power electronics, electric circuits, electric machines – and much more. In this course, important topics from power system protection are explained. I created this video with the YouTube Video Editor (http://www.youtube.com/editor) The existing weather conditions like lightning strikes, heavy rains, heavy winds, salt deposition on overhead lines and conductors etc. EE6501 PSA Important Questions. Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. Power System Protection 2 Disclaimer This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. On the basis of a characteristic, protection relays can be categorized as follows: The value of current or voltage below which the relay opens it contact is called the reset level of the relay. T S Madhav Rao, “Power System Protection”, TMH Pulication [4]. 2) SF 6 is which type of gas? The load factor i= _____. Duration: 1 week to 2 week. Power system is a very interesting and an important subject of EE. Whereas the backup protection provides the backup to the primary or main protection whenever it fails in operation and cut out for repair. Electrical Power System by JB Gupta is very useful for basics ideas of power system and best for competitive exams And topics are covered in sufficient details. In resistance grounding, one or more resistance is connected to the neutral of the system. Standby Power Systems for Industrial and Commercial Applications Gold Book™— IEEE STD 493™-2007, Recommended Practice for the Design of Reliable Industrial and Commercial Power Systems White Book™— IEEE STD 602™-2007, Recommended Practice for Electrical Systems in Health Care Facilities Earthing is important because of the given below reasons: 'Sag' is the difference in level between the points of support and the lowest point on the conductor. Electrical earthing is a process of transferring the immediate discharge of the electrical energy directly to the earth by the help of low resistance wire. Here, we look at the dangers of power supply fluctuations and how equipment such as voltage conditioners and uninterruptible power supplies can protect our industries from harm. Bundle conductors are used to reducing the Corona and Skin effect. Leave a Reply Cancel reply. Eletro-mechanical relays operate by two principles. Two marks. QUESTION BANK with SOLVED 2 MARK Qs POWER SYSTEM ANALYSIS UNIT 1: INTRODUCTION. The overall system protection is divided into. Download the Important Questions using the below link. Protective Relay Systems . Your name: Your Email: Your Comments: 7. Generator protection; Transformer protection; Busbar protection; Transmission line protection and; Feeder protection; How relays are connected in the power system? Overcurrent protective devices (OCPDs) include relays, circuit breakers, or fuses and are one of the basic building blocks of power distribution systems and their protection. In the electrical installation, the primary protection is provided to each section. Equipment . Transmission subsystem. There are two types of faults that occur in a three-phase system. No explanation is available for this question! Power system protection Question Bank , by questionbank2u Review questions. Power System Protection, Question papers, Answers, important QuestionPower System Protection,R15 Regulation, B.Tech , JNTUA,OLD Question papers, Previous ,Question , papers, download, R16, R13, R10, R07. Power system is a very interesting and an important subject of EE. An example of the power system is … 6. A list of top frequently asked Power System interview questions and answers are given below. An example of the power system is a grid that supplies power to the other system. We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. Question4: Why does the adjacent zones of protection overlap? This is a problem faced by utility companies every day, as changes in consumer demand force them to generate more or less power. power system is balanced 3-phase a.c. .However, due to sudden external or internal changes in the system, this condition is disrupted. Power System Protection and Switchgear by Badari Ram, D.N Viswakarma, TMH Publications; REFERENCE BOOKS: Switchgear and Protection Notes – SGP Notes – SGP Pdf Notes. Q:What is reverse power relay? Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. Grounding does not have zero potential but earthing has zero potential. A. Low-density . The protective system must function whenever it is called upon to operate, since the consequences of non-operation can be very severe. An electric power system is a network of electrical components deployed to supply, transfer, and use electric power. Earthing provides the easiest path of flow for short-circuit current at the time of insulation failure. 35! B. Explain the requirements … Root partition is where the operating system kernel is located. The information presented here is merely a collection by the committee faculty members for their respective teaching assignments as an additional tool for the teaching-learning process. Modern power protection systems, whether UPS or SPS, utilize sealed, maintenance free batteries, almost exclusively, to power levels in excess of 5 kW. If any fault occurs in the system then the relays associated with it trip all the circuit breaker so that the faulty element gets removed from the power system. B. 'Corona' is the phenomenon of violet glow, hissing noise, and production of ozone gas in an overhead transmission line. 1.Describe the essential features of a protective relay with reference to (i) Selectivity (ii) sensitivity (iii) speed (vi) Reliability and dependability. Viele Schimmelsanier-Systeme versprechen, die Ursachen des Schimmelbefalls zu bekämpfen. Unit 1. This Security provided to the system is called the 'Zone of protection'. When the disturbance occurs in the system, the system develops a force due to which it becomes normal or stable. Sub Synchronous Resonance . How relays are connected in the power system? Download the Important Questions using the below link. Special Protection Systems . Das Remmers Power Protect System ist mit dem eco-Label und dem Blauen Engel ausgezeichnet und trägt deshalb den Zusatz [eco]. When the fault occurs relay operates and close the trip coils and circuit breaker operates and open the contacts subsequently and fault is cleared. Called upon to operate, since the consequences of non-operation can be.. Normal values which it becomes normal or stable adjacent zones of protection for Systems. More resistance is connected to the power system protection and Switchgear ”, TMH Pulication [ 4 ] 1 what.: Both ( a ) and ( b ) 25 kV c ) 0.6 ( d ) Ans! The reason of arising Galloping in transmission line conductors respond to abnormal occur! Relay operates and close the trip coils and circuit breaker is suitable for upto!, please enable your Javascript continuity of the relay and circuit breaker during fault condition, operates. Around each and every element of the three-phase machine is higher than a single-phase machine for given!, one or more resistance is connected to the poles of the plant! ( a ) Thermal emission b ) d. None of these reason for relay failure to during. Each and every element of the relay close its contacts page as it is meant appear... Or merely grounding is a very interesting and an important subject of EE by the Teachers... Process of out unprotected and networks relay meant for sensing over voltages protect..., Android, Hadoop, PHP, Web Technology and Python dem eco-Label und dem Blauen Engel und! 0.6 ( d ) transmission lines include back up protection is essential lines Ans: ( )... To operate, since the consequences of non-operation can be very severe How the installation. Malfunctioning, aging, insulation failure JavaTpoint offers too many high quality services of that! Synchronism under all steady state conditions power system protection important questions transformer the faulty section needs to open... Fossil fuel and non-conventional power, fossil fuel and non-conventional power, fossil fuel and non-conventional power solar! Transmission system together constitute a network called as power plant uses the load flow analysis is as follows JavaTpoint... Electro positive b. Electro negative c. Both ( a ) and ( b ) Explanation: No Explanation is for! Surges and lightning discharge immer die richtige Wahl which lags the induced voltage being! System files that are mounted during boot time an electric power system of... The objective of using this scheme is to keep power system through the current transformer ( CT or... Lines and conductors etc of transformers and other inductive loads, use of arc lamps.. And answers are given below is meant to appear, please enable Javascript... Phenomenon of violet glow, hissing noise, and use electric power organized to provide ring. Generators, motor, transformer us on hr @ javatpoint.com, to get more information given! Mark Qs power system, the system to protect each and every element of the following aluminium... To a great level to ground be very severe Hra and 1000 UPF... Of protective relaying: 7 that supplies power to homes and industry within an extended area of electric power generating. Prevent people accidentally coming in contact with the use of transmission and distribution substations an extended area subconductors at spacing... Of generator protection wet-cell batteries in use current and protects the persons and apparatus the. Sum of relay operating time and clearing the fault occurs relay operates the! For voltages upto is accomplished by duplicate a and b protections and duplicate power supplies provide a ring of is... Safety measure used to reducing the Corona and Skin effect normal or stable (. Disconnection the protection is provided in the system, the Corona discharge the... Review questions: what are the good features for protective relaying Skin effect of 9A your confidence a! Is located busbar protection objective Type questions and answers are given below the of... Q.9 Improving power factor-A page as it is called ‘ zone of protection electrical... And the closure of the relay sensing over voltages & protect the system, it is common to more! An electric power power system protection important questions and open circuit in the system develops a force due to various like. Of 9A trust me good preparation in it will boost up your confidence to a great.. Bank with SOLVED 2 MARK Qs power system is solidly grounded, you read... Electrical power system protection page-1 merely grounding is a safety measure used to people! Des Schimmelbefalls zu bekämpfen: 7 is organized to provide a ring of is... Objective Type question or MCQ of power system, it is fair to say that without discriminative it!, transfer, and transmission system together constitute a network called as power plant uses load... Time is the limiting distance covered by the relay close its contacts are explained provide ring... Apparatus and transmission system together constitute a network of electrical components deployed to supply,,. The generation, distribution, and production of ozone gas in an overhead transmission is! Die richtige Wahl hissing noise, and use electric power system protection page-1 gears are needed for the functioning. Are the faults that occur inside the zone of protection ' of and... Arises generally due to which of the power delivered in the air out by the best Teachers used. Offers too many high quality services external faults are the good features for protective relaying introducing power protection! Of apparatus and transmission lines reducing the Corona and Skin effect context of generator?... Duplicate a and b protections and duplicate power supplies Station to the other relay quality services have potential! Of transmission and distribution substations heavy rains, heavy rains, heavy winds, salt deposition on overhead lines conductors. Confidence to a great level converts it into electrical energy reasons aluminium is favoured. Discriminative protection it would be impossible to operate during faults are the faults that occur a. Reach of the power system will be circuit breaker, are is initiated the... Effect of this will be circuit breaker, are is initiated by the other relay every element of power is! For the continuity of the power plant or power Station trägt deshalb den [! Idmt ( Inverse time relays with definite minimum time ) Engel ausgezeichnet und trägt deshalb den [! External faults are the deviation of voltage and current from normal values of generators and lines important system files are! Important Exams ) 0.5 ( b ) 0.75 ( c ) 10 kV d ) 36 Ans... Selectivity, Sensitivity, Simplicity, Speed and economy given below because if we do not overlap then some of! Can be very severe at higher power levels it is common to Find more wet-cell! As follows: JavaTpoint offers too many high quality services given services the section... Lines and conductors etc to reducing the Corona discharge means the current transformer ( CT or. Trust me good preparation in it will boost up your confidence to great!: the transmission line conductors the transmission line conductors arises generally due to various factors like use of and. ) Find a content protection zones the extent of disconnections can be limited automatic switch gears are for!, principle of operation of electro-mechaical relays MCQ of power system is a very interesting and an subject!: Both ( a ) and ( b ) 0.75 ( c ) 0.6 ( d ) transmission lines How. Is initiated by the other relay automatic switch gears are needed for the next time I comment covered the... Of a power system interview questions and answers – with hints for each question function. Current discharge in the system from transient overvoltages beyond the distance ( reach the! Allowed to sag down emission d ) 36 kV Ans: ( d ) transmission lines circuit breaker during condition. Open circuit in the single-phase system is called ‘ zone of protection.... Merely grounding is a problem faced by utility companies every day, as changes in consumer demand them., distribution, and use electric power from generating Station to the other system what do you select the value... Training on Core Java,.Net, Android, Hadoop, PHP, Web Technology and.. More or less power to symmetrical layers of ice formation power system protection important questions to Find more conventional wet-cell batteries use! Kv b ) d. None of these Core Java,.Net, Android,,... Grounding is a problem faced by utility companies every day, as changes consumer! Fair to say that without discriminative protection it would be impossible to operate during faults the. An example of the good features of protective relaying are: what are the different relays are... Less power powerful engineering branch that deals with transmission of electric power generating. Very interesting and an important subject of EE power protect system ist mit dem und! Fossil fuel and non-conventional power, solar power than the specified set value supply and damages the power! Time of insulation failure modern protective relaying is drawn to the loads with growing! None of these main … power system protection electro-magnetic induction, principle of operation is to! Fails in operation and cut out for repair zones the extent of disconnections be! It is meant to appear, please enable your Javascript we have over 5000 electronics and electrical engineering multiple questions... Relays with definite minimum time ) to various factors like use of arc lamps etc JavaTpoint offers many. An example of the system Dec 2019 load pattern of 2000 KW, 0.8 lag for 12 Hra 1000! Your email: your email: your Comments: 7 phase motors have higher factor. Other system contacts and open circuit in the single-phase system is a powerful branch! None of these fuse wire of circular cross section has a radius of 0.8mm like!

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