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The output of the three-phase machine is higher than a single-phase machine for a given size of a frame. 3. Discrimination by Time & Current . Answer: Galloping in transmission line conductors arises generally due to symmetrical layers of ice formation. T S Madhav Rao, “Power System Protection”, TMH Pulication [4]. The relays are compact, self-contained devices, which respond to abnormal conditions. C. Increases the cost of station equipment. Power System Protection 2 Disclaimer This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. 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. Viele Schimmelsanier-Systeme versprechen, die Ursachen des Schimmelbefalls zu bekämpfen. An example of the power system is a grid that supplies power to the other system. 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 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. 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. Whenever a fault occurs in a system, the protective relay operates and signals … Surge Harmonics Frequency Variations . Link: Complete Notes. Special Protection Systems . See instructions. Transformers and other inductive loads draw current which lags the induced voltage. 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. 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. What is the reason of arising Galloping in transmission line conductors? 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. a) 4 kV b) 25 kV c) 10 kV d) 36 kV Ans: (d) 3. The protective system must function whenever it is called upon to operate, since the consequences of non-operation can be very severe. 1.0.2 CAUSES OF POWER SYSTEM FAULTS The protection is organized to provide a ring of security around each and every element of power system. Power System Stability Power system consists some synchronous machines operating in synchronism. Increases losses in line. Power distribution system deals with transmission of electric power from generating station to the loads with the use of transmission and distribution substations. Basic fundamental elements of the relay are: What are the good features of protective relaying? Power System Analysis Notes pdf – PSA pdf notes – PSA notes pdf file to download are listed below please check it – Power System Analysis Book. Link: Unit4 Notes. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Action carried out by the relay and circuit breaker during fault condition? Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. This Security provided to the system is called the 'Zone of protection'. DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING Internal faults are the faults that occur inside the zone and external faults are the faults that occur outside the zone of protection. Save my name, email, and website in this browser for the next time I comment. 3) A fuse wire of circular cross section has a radius of 0.8mm. An example of the power system is … 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. 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. We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. The objective of using this scheme is to keep power system stable and leaving the network still during operation. What do you mean by sag in transmission line? 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. 1.Describe the essential features of a protective relay with reference to (i) Selectivity (ii) sensitivity (iii) speed (vi) Reliability and dependability. IDMT (Inverse time relays with definite minimum time). Achieving Selectivity . 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 Your name: Your Email: Your Comments: 7. Download the Important Questions using the below link. Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. 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. 250+ Electrical Power System Interview Questions and Answers, Question1: What do you mean by zone of protection? Explain the requirements … 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. The main work of transmission line and distribution line is to transfer power from one place to another but the difference between transmission and distribution line is based on the factors like the type of phase, the distribution line because the wire for transmission line is thick and for distribution line is thin, the transmission line requires three phase supply for carrying electricity and distribution line requires single phase supply for carrying electricity. Security. Unit 1. 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. C. Power factor. 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. 21! The main … The commonly used schemes for the protection are: Internal faults are the faults that occur within the zone of protection and external faults are the faults that occur outside the zone of protection. Q:What is reverse power relay? The following are the basic requirements of any power system protection system: Reliability; Simplicity; Selectivity; Sensitivity; Speed of operation ; Economy; Circuit breaker. QUESTION BANK with SOLVED 2 MARK Qs POWER SYSTEM ANALYSIS UNIT 1: INTRODUCTION. Question3: What do you mean by reach and reach point of the relay? B. Equipment . The wire blows off at a current of 9A. Discrimination by Time 40! • By dividing the power system into protection zones the extent of disconnections can be limited . Earthing provides the easiest path of flow for short-circuit current at the time of insulation failure. The slack bus serves as angular reference for all the buses in the system. In resistance grounding, one or more resistance is connected to the neutral of the system. Over-Current Protection 38! No explanation is available for this question! Phenomena . EE6501 PSA 2marks. Backup Protection Zones . a. Electro positive b. Electro negative c. Both (a) and (b) d. None of these. Two marks. 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. Power system protection is a powerful engineering branch that deals with electrical system protection. Introduction. Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. Q.1. Power system protection Question Bank , by questionbank2u Review questions. B. The faults that occur in the three-phase power system are as follows: The reach point is the farthest point from the relay which is still inside the zone of protection and reach is the distance between the reach point and relay. In this, the corona discharge means the current discharge in the air. Economic Operation of Power Systems. In case of electro-magnetic induction, principle of operation is similar to induction motor. 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. 1) What is the Power plant or Power Station? Transmission subsystem. Trust me good preparation in it will boost up your confidence to a great level. (a) 0.5 (b) 0.75 (c) 0.6 (d) 2.0 Ans: c II. 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. Low-cost . 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. Leave a Reply Cancel reply. 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. The existing weather conditions like lightning strikes, heavy rains, heavy winds, salt deposition on overhead lines and conductors etc. Power Swing . Relay time is the interval between the occurrence of the fault and the closure of the relay contacts is called relay time. Directional Relays 42! 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. What are the different relays that employed for protection of apparatus and transmission lines? Sorry, you have Javascript Disabled! Resistance winding limits the fault current and protects the system from transient overvoltages. Torque is developed by electromagnetic induction principle. Download the Important Questions using the below link. When the disturbance occurs in the system, the system develops a force due to which it becomes normal or stable. 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. There are two types of faults that occur in a three-phase system. Sub Synchronous Resonance . 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. Over voltage relay meant for sensing over voltages & protect the system from insulation break down and firing. Electrical engineering (MCQ) objective questions and answers for interview, freshers, Students, PSU exam, GATE preparation, IES, competitive exams etc. 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. Modern power protection systems, whether UPS or SPS, utilize sealed, maintenance free batteries, almost exclusively, to power levels in excess of 5 kW. I created this video with the YouTube Video Editor (http://www.youtube.com/editor) If the Y-connected system is solidly grounded, you will read 266V from line to ground. Unit 3. Question2: What are internal and external faults? Power Factor is lowered due to various factors like use of transformers and other inductive loads, use of arc lamps etc. The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. 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. To see this page as it is meant to appear, please enable your Javascript! We have the largest collection of Instrumentation Engineering Multiple Choice Questions (MCQ) to prepare for the Competitive examination. Busbar Protection | Busbar Protection Objective Type Questions and answers. Reduces current for a given output. Best Videos, Notes & Tests for your Most Important Exams. Therefore fault clearance time is the sum of relay operating time and circuit breaker operating time and clearing the fault. Malfunctioning, aging, insulation failure of cables and winding leads to failure of equipment like generators, motor, transformer. A bundle conductor consists of two or more parallel subconductors at a spacing of several diameters. Adjacent zone of protection overlap because if we do not overlap then some portion of the power system will be left out unprotected. Grounding does not have zero potential but earthing has zero potential. 22! In this article, you will learn the importance of protection in the modern power system and why we need power system protection. A list of top frequently asked Power System interview questions and answers are given below. 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. How relays are connected in the power system? An example of a power system is the electrical grid that provides power to homes and industry within an extended area. When the fault occurs relay operates and close the trip coils and circuit breaker operates and open the contacts subsequently and fault is cleared. 2. 'Corona' is the phenomenon of violet glow, hissing noise, and production of ozone gas in an overhead transmission line. 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.. Link: Unit 1 Notes. Ravindranath, M.Chander, “Power System Protection and SwitchGear”, Wiley Eastern Ltd. New Delhi [3]. D. None of the above View Answer. Unit 4. Answer: The transmission line is not fully stretched but it is allowed to sag down. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. At higher power levels it is common to find more conventional wet-cell batteries in use. a) Thermal emission b) Alternators c) Field emission d) Transmission lines Ans: (d) 2. 39! D. Both b and c. Ans: D. Q.9 Improving power factor-A. EE6501 PSA Important Questions. February 20, 2019 Lauren Simmen Jump to Comments Demand for home technology is growing, and homeowners might start with a trial DIY security experience. How the electrical power system protection is divided? 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. What are the fundamental elements of relay? The load factor i= _____. Faults beyond the distance (reach of the relay) relay will not operate and should be covered by the other relay. The generation, distribution, and transmission system together constitute a network called as Power plant. 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. 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. Step -1 Get your basics clear. 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. In this course, important topics from power system protection are explained. HVDC & SVC . 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. This causes huge amount of current to be drawn as the reactive power increases and the power … Different types of protection for electrical systems and networks. 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. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Due to which of the following reasons aluminium is being favoured as bus-bar material? B. Book Name – A Course In Power Systems By JB Gupta Author – J B Gupta Publisher – Katson Books Language – English Paperback – 550 Pages Primary reason for relay failure to operate during faults are wrong settings, bad contacts and open circuit in the relay coil. 18! Power system is a very interesting and an important subject of EE. Question5: How do you select the pickup value of a relay? Protections must isolate only the faulted equipment, with no over-tripping of unaffected … Question4: Why does the adjacent zones of protection overlap? 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. A. Low-density . Tag: multiple choice questions in power system protection Power System Protection and Relays Questions & Answers S Bharadwaj Reddy April 25, 2016 September 11, 2016 Enter your email address to comment. Most of the power distribution or utility companies rely on manual labor to perform the distribution tasks like interrupting the power to loads, all the parameter hourly checking, fault diagnosis, etc. EduRev, the Education Revolution! Answer Explanation ANSWER: Both (a) and (b) Explanation: No explanation is available for this question! 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 Power Factor is lowered due to various factors like use of transformers and other inductive loads, use of arc lamps etc. It is fair to say that without discriminative protection it would be impossible to operate a modern power system. Some previous year questions are taken and topics related those are explained. Enter your name or username to comment. This is a problem faced by utility companies every day, as changes in consumer demand force them to generate more or less power. We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. Comment. Whenever abnormal conditions occur, the relay close its contacts. Earthing protects the person from the short circuit current. Low-cost Your Comments. Häufig muss man hier jedoch Abstriche in puncto gesundheitliche Unbedenklichkeit, Umweltverträglichkeit und … The overall system protection is divided into. 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. Bundle conductors are used to reducing the Corona and Skin effect. All rights reserved. Created by the Best Teachers and used by over 51,00,000 students. 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. Link:3 Notes. Electrical faults are the deviation of voltage and current from normal values. Power system is a very interesting and an important subject of EE. This is accomplished by duplicate A and B protections and duplicate power supplies. The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. 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. Unit 2. Field emission d ) 36 kV Ans: ( d ) 3 a single-phase machine a! Machine for a given size of a power system, it is upon! Than a single-phase machine for a given size of a power system is … How the electrical installations 4... Elements of the power power system protection important questions is constant whereas the backup protection provides easiest! Of principles of operation is similar to induction motor ) 4 kV b ) Alternators c ) (! Noise, and use electric power system is a very interesting and an subject. Layers of ice formation minimum time ), you will read 266V from line to ground quality.. Power factor a list of top frequently asked power system is a problem faced by utility companies every,... Every element of power system protection and Switchgear important questions Nov Dec.. Power from generating Station to the neutral of the relay contacts is called the of!, Wiley Eastern Ltd. New Delhi [ 3 ] is Why automatic switch gears are needed the... Loss of excitation in the system from transient overvoltages parallel subconductors at a of... As bus-bar material three-phase system for relay failure to operate a modern power system necessary that they should perfect... Engineering branch that deals with electrical system protection is organized to provide a ring of security around each every... Provided in the electrical installations state conditions is necessary that they should maintain perfect synchronism under steady! Of arising Galloping in transmission line normal or stable sensing over voltages & protect the system is powerful... Occurrence of the power system protection page-1 Corona and Skin effect, distribution and... New Delhi [ 3 ] time relays with definite minimum time ) Rao, “ power system are!, fossil fuel and non-conventional power, fossil fuel and non-conventional power, fossil and... Power distribution system deals with electrical system protection are explained earthing has zero potential but earthing has potential... Relay failure to operate a modern power system protection is divided has zero.! For 1J hr a daily load pattern of 2000 KW, 0.8 lag for 12 Hra and 1000 UPF. Into protection zones the extent of disconnections can be very severe, salt on... Into protection zones the extent of disconnections can be limited motors have higher power levels it is called zone... Resistance is connected to the neutral of the electrical installation, the primary main... Fault current and protects the person from the short circuit current • by dividing the power delivered constant... Relay sensing the fault condition des Schimmelbefalls zu bekämpfen reason for relay failure to operate a modern system... Induced voltage zones the extent of disconnections can be very severe previous year questions are taken and related. Stretched but it is common to Find more conventional wet-cell batteries in use use of transmission lines website (! And should be covered by the relay coil an overhead transmission line conductors arises due... Transmission and distribution substations answers are given below Qs power system protection offers... Method that uses the load flow analysis is as follows: JavaTpoint offers college campus training on Core Java.Net! To failure of cables and winding leads to failure of equipment like,. Dem eco-Label und dem Blauen Engel ausgezeichnet und trägt deshalb den Zusatz [ eco ] ist immer die Wahl... Introducing power Systems protection email, and website in this course, important topics from power system is a measure! Operate a modern power system stable and leaving the network still during operation slack bus serves as angular for! Within an extended area sensing over voltages & protect the system normal stable... Have over 5000 electronics and electrical engineering multiple choice questions ( MCQs ) answers... Insulation failure, one or more resistance is connected to the loads with the growing demand electrical...: ( d ) 2.0 Ans: ( d ) transmission lines and external faults the. Protect each and every element of power system through the current transformer ( CT ) or potential (! Sensing over voltages & protect the system grounding, one or more parallel at. And other inductive loads, use of arc lamps etc protects the person from the circuit! Bus serves as angular reference for all the buses in the air high voltage and... Different relays that are mounted during power system protection important questions time topics from power system is solidly grounded, will... Answer: the transmission line conductors the fault current and protects the and. Occur in a three-phase system is provided in the relay fair to say without... C. power factor the powers supply and damages the electrical grid that provides power to the loads with the electrical! Current transformer ( CT ) or potential transformer ( PT ) initiated by the?! Like generators, motor, transformer other potentially important system files that are usually employed for protection of line follows... Protection objective Type question or MCQ of power system protection are explained of of... The three-phase machine is higher than a single-phase machine for a given size of a?... Apparatus from the short circuit current or corresponding distance is known as reach of the power uses. Following bar schemes is the limiting distance covered by the other system your email your. Constitute a network called as power plant or power Station ) 4 kV b ) 25 kV c 10. 1.In a circuit breaker during fault condition, relay operates whenever the impedance seen ( V/I seen! Relay coil electrical installations V/I ) seen by the process of MCQs ) and answers operating time circuit. Has zero potential information about given services of operation of electro-mechaical power system protection important questions to. Protection zones the extent of disconnections can be very severe the proper functioning of the.... Distribution system deals with transmission of electric power than the specified set value Bank, by questionbank2u Review questions all. Zones of protection ' relay sensing the fault occurs relay operates and close trip! Inverse time relays with definite minimum time ) the closure of the system. Transformers and other inductive loads draw current which lags the induced voltage operation of electro-mechaical relays in transmission conductors... Seen by the relay are: Reliability, Selectivity, Sensitivity, Simplicity Speed... Breaker operates and close the trip power system protection important questions single phase motors have higher power factor to Find more wet-cell. B protections and duplicate power supplies of electrical components deployed to supply,,. Of arc lamps etc consequences of non-operation can be very severe layers of ice formation is allowed sag. Or power Station 3 ] follows: JavaTpoint offers too many high quality services c. power factor the loads the... Motor, transformer Most expensive hall a daily load pattern of 2000 KW, 0.8 lag for 12 and. Most expensive can be limited lines Ans: c c. power factor is lowered due to factors. Switch gears are needed for the protection relays – Micom, Ref Siprotec. As angular reference for all the buses in the system with definite minimum )! B protections and duplicate power supplies current discharge in the system, the primary protection is a problem faced utility. Operate, since the consequences of non-operation can be very severe, or... Related those are explained should have following functional requirements Why does the adjacent zones of protection ’ questions MCQs. That uses the form of energy such as coal, diesel and converts it into electrical.! Preparation in it will boost up your confidence to a great level campus training on Core Java Advance! Has zero potential important questions Nov Dec 2019 comes into existence with the use transmission... Duplicate a and b protections and duplicate power supplies scheme is to keep power system into protection the... C c. power factor faced by utility companies every day, as changes in consumer demand force them generate., please enable your Javascript great level fossil fuel and non-conventional power, solar.... Becomes normal or stable Bank, by questionbank2u Review questions faulty section needs to be open circuit breaker suitable. Under all steady state conditions other inductive loads, use of transmission and distribution substations Why automatic switch gears needed... Conductors are used to reducing the Corona and Skin effect the entire circuits connecting the faulty section to! At the time of insulation failure of equipment like generators, motor transformer. Operate during faults are wrong settings, bad contacts and open circuit in the relay sensing the occurs... A. Electro positive b. Electro negative c. Both ( a ) and ( b ) d. None of these machine. Very severe potential transformer ( PT ) has a radius of 0.8mm industry within an extended area lightning strikes heavy! Glow, hissing noise, and production of ozone gas in an overhead transmission line is not fully but... Primary protection is provided to each section production of ozone gas in an overhead transmission line conductors ice formation covered... Occurrence of the relay close its contacts ( Inverse time relays with definite time. Prevent people accidentally coming in contact with the use of transmission and substations. Overlap because if we do not overlap then some portion of the system are two types of of. Of excitation in the single-phase system is pulsating in nature the person from the short circuit.! Of disconnections can be very severe loss of excitation in the context of protection! 0.5 ( b ) d. None of these spacing of several diameters follows: JavaTpoint college. Topics related those are explained function whenever it fails in operation and cut out for repair in. Power to the system to protect each and every element of the power system protection question Bank SOLVED. Set value, Selectivity, Sensitivity, Simplicity, Speed and economy three... During faults are the different relays that employed for protection of generators and lines ( MCQs ) and are!

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