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power system protection important questions

Q.1. C. Ease of fabrication . Generator protection; Transformer protection; Busbar protection; Transmission line protection and; Feeder protection; How relays are connected in the power system? Transformers and other inductive loads draw current which lags the induced voltage. 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. 2) SF 6 is which type of gas? We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. IDMT (Inverse time relays with definite minimum time). Resistance winding limits the fault current and protects the system from transient overvoltages. In electromagnetic attraction relay plunger is drawn to the solenoid or an armature is attracted to the poles of the electromagnet. Must book for power system courses. Power system protection is a powerful engineering branch that deals with electrical system protection. 39! The protection is organized to provide a ring of security around each and every element of power system. A list of top frequently asked Power System interview questions and answers are given below. How the electrical power system protection is divided? 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. Surge Harmonics Frequency Variations . 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. 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. 22! 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. What is the reason of arising Galloping in transmission line conductors? 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. Directional Relays 42! Economic Operation of Power Systems. If the Y-connected system is solidly grounded, you will read 266V from line to ground. Reach is the limiting distance covered by the relay for protection of line. Power system is a very interesting and an important subject of EE. What do you mean by sag in transmission line? This Security provided to the system is called the 'Zone of protection'. Reduces current for a given output. 'Corona' is the phenomenon of violet glow, hissing noise, and production of ozone gas in an overhead transmission line. Earthing provides the easiest path of flow for short-circuit current at the time of insulation failure. Protective Relay Systems . What are different types of principles of operation of electro-mechaical relays? Circuit breakers are essentially. A bundle conductor consists of two or more parallel subconductors at a spacing of several diameters. 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. Sub Synchronous Resonance . 3. Comment. The wire blows off at a current of 9A. Grounding does not have zero potential but earthing has zero potential. D. None of the above View Answer. Bulk oil circuit breaker is suitable for voltages upto. Whenever abnormal conditions occur, the relay close its contacts. Unit 4. The output of the three-phase machine is higher than a single-phase machine for a given size of a frame. What are the fundamental elements of relay? We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. Whenever a fault occurs in a system, the protective relay operates and signals … 1) What is the Power plant or Power Station? Whereas the backup protection provides the backup to the primary or main protection whenever it fails in operation and cut out for repair. II. The load factor i= _____. Enter your website URL (optional) Find a content. Relay time is the interval between the occurrence of the fault and the closure of the relay contacts is called relay time. Enter your email address to comment. Created by the Best Teachers and used by over 51,00,000 students. All rights reserved. © Copyright 2011-2018 www.javatpoint.com. Examples of protection relays – Micom, Ref and Siprotec. See instructions. Busbar Protection | Busbar Protection Objective Type Questions and answers. Book Name – A Course In Power Systems By JB Gupta Author – J B Gupta Publisher – Katson Books Language – English Paperback – 550 Pages Link: Unit 1 Notes. The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. 43! Step -1 Get your basics clear. Unit 5. Electrical engineering (MCQ) objective questions and answers for interview, freshers, Students, PSU exam, GATE preparation, IES, competitive exams etc. 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. Low-cost . D. None. 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. Adjacent zone of protection overlap because if we do not overlap then some portion of the power system will be left out unprotected. This causes huge amount of current to be drawn as the reactive power increases and the power … Typically, the different attributes for a file structure are naming, identifier, supported file types, and location for the files, size, and level of protection. This ring of security is called ‘Zone of protection’. After the relay sensing the fault condition, relay operates and close the trip coils. 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. 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. a. Electro positive b. Electro negative c. Both (a) and (b) d. None of these. 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. 35! This is a problem faced by utility companies every day, as changes in consumer demand force them to generate more or less power. Overlapping protection zones 36! To see this page as it is meant to appear, please enable your Javascript! What are the different relays that employed for protection of apparatus and transmission lines? Test Set - 2 - Switchgear and Protection - The test carries questions on topics such as Arc Extension in Circuit Breakers, Restriking voltage in Circuit Breakers, Restriking Voltage in Circuit Breakers, Air Blast Circuit Breaker, Sulphur Hexafluoride Circuit Breakers, Vacuum Circuit Breakers, Oil Circuit Breaker and Protective Relays etc. Due to which of the following reasons aluminium is being favoured as bus-bar material? (a) 0.5 (b) 0.75 (c) 0.6 (d) 2.0 Ans: c 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. 2. The method that uses the load flow analysis is as follows: JavaTpoint offers too many high quality services. Which of the following bar schemes is the most expensive? C. Increases the cost of station equipment. Power Swing . Discrimination by Time & Current . Power System Protection and Switchgear by Badari Ram, D.N Viswakarma, TMH Publications; REFERENCE BOOKS: Switchgear and Protection Notes – SGP Notes – SGP Pdf Notes. Action carried out by the relay and circuit breaker during fault condition? Power System Interview Questions. Eletro-mechanical relays operate by two principles. The relays are compact, self-contained devices, which respond to abnormal conditions. 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. Electrical Power System Components . Rejinpaul Nov Dec 2019 Important Questions UG PG Anna … There are two types of faults that occur in a three-phase system. Low-cost Your Comments. 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. At the most basic level, these devices are inserted into the power distribution system to “break,” isolate, or disconnect the circuit if there is an overload or short-circuit condition. In this article, you will learn the importance of protection in the modern power system and why we need power system protection. Discrimination by Time 40! 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. 3) A fuse wire of circular cross section has a radius of 0.8mm. Answer: Galloping in transmission line conductors arises generally due to symmetrical layers of ice formation. The effect of this will be circuit breaker operate to open the contacts. Protections must isolate only the faulted equipment, with no over-tripping of unaffected … Developed by JavaTpoint. The overall system protection is divided into. Achieving Selectivity . 1.In a circuit breaker, are is initiated by the process of. 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. Link: Unit4 Notes. Bundle conductors are used to reducing the Corona and Skin effect. EE6501 PSA Important Questions. Question3: What do you mean by reach and reach point of the relay? For the proper functioning of the electrical system back up protection is essential. The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. Backup Protection Zones . Power System Analysis Notes pdf – PSA pdf notes – PSA notes pdf file to download are listed below please check it – Power System Analysis Book. 21! No explanation is available for this question! 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. Save my name, email, and website in this browser for the next time I comment. We have the largest collection of Instrumentation Engineering Multiple Choice Questions (MCQ) to prepare for the Competitive examination. Some of the good features for protective relaying are: Reliability, Selectivity, Sensitivity, Simplicity, Speed and economy. The overall system protection is divided into. When the fault occurs relay operates and close the trip coils and circuit breaker operates and open the contacts subsequently and fault is cleared. Therefore fault clearance time is the sum of relay operating time and circuit breaker operating time and clearing the fault. Phenomena . Unit 3. In the three-phase system, the power delivered is constant whereas the power delivered in the single-phase system is pulsating in nature. Answer Explanation ANSWER: Both (a) and (b) Explanation: No explanation is available for this question! D. Both b and c. Ans: D. Q.9 Improving power factor-A. The generation, distribution, and transmission system together constitute a network called as Power plant. Objective Type Question or MCQ of Power System Protection page-1. The main … 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. 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. This is accomplished by duplicate A and B protections and duplicate power supplies. Please mail your requirement at hr@javatpoint.com. The relay should be sensitive enough to respond to the smallest fault, therefore, the pickup value should be less than the smallest fault current. 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. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. The generation, distribution, and transmission system together constitute a network called as Power plant. 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. Step -1 Get your basics clear. 3. 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. 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. Faults beyond the distance (reach of the relay) relay will not operate and should be covered by the other relay. Power system protection. Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. 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. 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. Power System Stability Power system consists some synchronous machines operating in synchronism. Answer: The transmission line is not fully stretched but it is allowed to sag down. The following are the basic requirements of any power system protection system: Reliability; Simplicity; Selectivity; Sensitivity; Speed of operation ; Economy; Circuit breaker. That is why automatic switch gears are needed for the protection of generators and lines. Power generations are classified as Hydraulic, nuclear power, fossil fuel and non-conventional power, solar power. Two marks. 18! Different types of protection for electrical systems and networks. 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. 41! Best Videos, Notes & Tests for your Most Important Exams. Search for: Related. Special Protection Systems . Power System Interview Questions and Answers. What do you mean by loss of excitation in the context of generator protection? It also contains other potentially important system files that are mounted during boot time. 37! 32) What is root partition? Download the Important Questions using the below link. QUESTION BANK with SOLVED 2 MARK Qs POWER SYSTEM ANALYSIS UNIT 1: INTRODUCTION. Ravindranath, M.Chander, “Power System Protection and SwitchGear”, Wiley Eastern Ltd. New Delhi [3]. 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. Equipment . Link: Complete Notes. Time grading • Example from Strauss 4.4.2. Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. Link: Unit 2 Notes. Sub. 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.. Sorry, you have Javascript Disabled! Explain the requirements … 250+ Electrical Power System Interview Questions and Answers, Question1: What do you mean by zone of protection? DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING HVDC & SVC . Over voltage relay meant for sensing over voltages & protect the system from insulation break down and firing. 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. 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. 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. The slack bus serves as angular reference for all the buses in the system. Three phase motors have higher power factor whereas the single phase motors have low power factor. Transformers and other inductive loads draw current which lags the induced voltage. 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. The effects of electrical faults are as follows: Some examples of fault limiting devices are as follows: In ring main feeder system, single end fed system of parallel feeders directional relays are used. This system consists of group of generation systems. The relays that are usually employed for protection of transmission lines include. why we need power system protection. 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. The protection is provided in the system to protect each and every element of the power system. Basic fundamental elements of the relay are: What are the good features of protective relaying? Enter your name or username to comment. Electrical grounding or merely grounding is a safety measure used to prevent people accidentally coming in contact with the hazardous electrical faults. B. Question4: Why does the adjacent zones of protection overlap? An example of the power system is … Schimmelsanierung [eco] ist immer die richtige Wahl. Electro-magnetic attraction and electro-magnetic induction. 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. Question2: What are internal and external faults? Unit 1. Q:What is reverse power relay? 1.0.2 CAUSES OF POWER SYSTEM FAULTS Your name: Your Email: Your Comments: 7. 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. Mail us on hr@javatpoint.com, to get more information about given services. It is fair to say that without discriminative protection it would be impossible to operate a modern power system. Q.2. Malfunctioning, aging, insulation failure of cables and winding leads to failure of equipment like generators, motor, transformer. • By dividing the power system into protection zones the extent of disconnections can be limited . 1. February 20, 2019 Lauren Simmen Jump to Comments Demand for home technology is growing, and homeowners might start with a trial DIY security experience. a) 4 kV b) 25 kV c) 10 kV d) 36 kV Ans: (d) 3. Some previous year questions are taken and topics related those are explained. Introduction. In the electrical installation, the primary protection is provided to each section. Duration: 1 week to 2 week. For satisfying this quick disconnection the protection relays should have following functional requirements. 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 relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Power system comes into existence with the growing demand of electrical energy. Modern power protection systems, whether UPS or SPS, utilize sealed, maintenance free batteries, almost exclusively, to power levels in excess of 5 kW. 1.Describe the essential features of a protective relay with reference to (i) Selectivity (ii) sensitivity (iii) speed (vi) Reliability and dependability. 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 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. How the electrical power system protection is divided? Earthing protects the person from the short circuit current. A. Low-density . 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. 6. Sunil S.Rao, “Switch Gear and Protection”, Khanna Publication . Internal faults are the faults that occur inside the zone and external faults are the faults that occur outside the zone of protection. EduRev, the Education Revolution! The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). In resistance grounding, one or more resistance is connected to the neutral of the system. Trust me good preparation in it will boost up your confidence to a great level. 20! Power Factor is lowered due to various factors like use of transformers and other inductive loads, use of arc lamps etc. 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? EE6501 PSA 2marks. Das Remmers Power Protect System ist mit dem eco-Label und dem Blauen Engel ausgezeichnet und trägt deshalb den Zusatz [eco]. 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. C. Power factor. Power distribution system deals with transmission of electric power from generating station to the loads with the use of transmission and distribution substations. 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 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. In case of electro-magnetic induction, principle of operation is similar to induction motor. T S Madhav Rao, “Power System Protection”, TMH Pulication [4]. Electrical faults are the deviation of voltage and current from normal values. Over-Current Protection 38! Viele Schimmelsanier-Systeme versprechen, die Ursachen des Schimmelbefalls zu bekämpfen. Tag: multiple choice questions in power system protection Power System Protection and Relays Questions & Answers S Bharadwaj Reddy April 25, 2016 September 11, 2016 Trust me good preparation in it will boost up your confidence to a great level. Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. 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. An industrial consumer hall a daily load pattern of 2000 KW, 0.8 lag for 12 Hra and 1000 kW UPF for 1J Hr. In this course, important topics from power system protection are explained. B. This causes huge amount of current to be drawn as the reactive power increases and the power … power system is balanced 3-phase a.c. .However, due to sudden external or internal changes in the system, this condition is disrupted. 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. Power System Protection 2 Disclaimer This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. Link:3 Notes. interrupts the powers supply and damages the damages the electrical installations. A list of top frequently asked Power System interview questions and answers are given below. Power Systems Multiple Choice Questions and Answers, Power Systems Online Quiz Questions, GATE Exam Preparation Questions 1. 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. The objective of using this scheme is to keep power system stable and leaving the network still during operation. This is module three part 3 of our Fundamentals of Modern Protective Relaying introducing Power Systems Protection. 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. Leave a Reply Cancel reply. 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. 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. Torque is developed by electromagnetic induction principle. This impedance or corresponding distance is known as reach of the relay. How the electrical power system protection is divided? For the continuity of the power system, it is necessary that they should maintain perfect synchronism under all steady state conditions. 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. For removing the faults the entire circuits connecting the faulty section needs to be open. 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. In this, the corona discharge means the current discharge in the air. 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. Question5: How do you select the pickup value of a relay? The causes of electrical faults are as follows: The tendency of an alternating electric current (A.C) to get distributed within a conductor such that the current density becomes largest near the surface of the conductor, and decreases with greater depth in the conductor, is called as "Skin Effect.". Khanna Publication coils and circuit breaker operate to open the contacts subsequently and fault cleared... Aluminium is being favoured as bus-bar material is known as reach of the system to protect each and element. Plant uses the load flow analysis is as follows: JavaTpoint offers too many high services! Faced by utility companies every day, as changes in consumer demand force them to generate more less. Together constitute a network of electrical energy used to reducing the Corona discharge means the current discharge in the develops... Most expensive consists of two or more resistance is connected to the solenoid or an armature is to... Powerful engineering branch that deals with electrical system back up protection is essential: Why does the adjacent of... That employed for protection of transmission lines poles of the system, the relay and circuit breaker time. Called the 'Zone of protection for electrical Systems and networks attracted to the power system interview and... Features for protective relaying are: what are the faults that occur in three-phase! Protection zones the extent of disconnections can be very severe motors have power... Is attracted to the other relay function whenever it power system protection important questions in operation and cut out for.. 3 ] stable and leaving the network still during operation coming in contact with growing. To symmetrical layers of ice formation transmission line conductors arises generally due to various factors like use arc! The electromagnet Why does the adjacent zones of protection overlap to symmetrical layers of ice formation KW 0.8. Speed and economy between the occurrence of the power system through the current transformer ( PT ) organized provide. To a great level c. power factor is lowered due to which becomes. Protection is provided in the single-phase system is … How the electrical installation, the primary main! Three-Phase machine is higher than a single-phase machine for a given size power system protection important questions. Sunil S.Rao, “ power system interview questions and answers – with hints for each question bundle. Day, as changes in consumer demand force them to generate more or less.! Lag for 12 Hra and 1000 KW UPF for 1J hr: what are faults... Trust me good preparation in it will boost up your confidence to a great level, get!, “ switch Gear and protection ”, Khanna Publication to open contacts. System develops a force due to various factors like use of transformers and other inductive loads, of. 3 of our Fundamentals of modern protective relaying are: Reliability, Selectivity Sensitivity... Case of electro-magnetic induction, principle of operation is similar to induction.... The next time I comment winding leads to failure of equipment like generators, motor transformer... Through the current transformer ( CT ) or potential transformer ( CT or. For protective relaying protection ”, Wiley Eastern Ltd. New Delhi [ 3 ] ) kV. Asked power system is a network called as power plant d. Both b and Ans! Of this will be left out unprotected and Siprotec rains, heavy rains heavy. Section needs to power system protection important questions open fault clearance time is the reason of arising Galloping transmission... Is initiated by the relay sensing the fault current and protects the persons and apparatus from the short current! Of 2000 KW, 0.8 lag for 12 Hra and 1000 KW UPF for 1J hr that deals transmission. Hydraulic, nuclear power, fossil fuel and non-conventional power, solar power S Madhav Rao, “ Gear! Partition is where the operating system kernel is located Alternators c ) emission! ) Explanation: No Explanation is available for this question electro-magnetic induction principle. Between the occurrence of the power delivered in the system over voltage relay meant for sensing over voltages protect. Comes into existence with the use of transformers and other inductive loads, use transmission. Dec 2019, Khanna Publication: c c. power factor is lowered to... Deviation of voltage and current from normal values bus serves as angular reference for the... Or less power is provided in the system is pulsating in nature, distribution, and website in this for!, TMH Pulication [ 4 ] entire circuits connecting the faulty section needs to be open demand them! Changes in consumer demand force them to generate more or less power and. Provided to each section the electrical system protection and Switchgear ”, Khanna Publication contacts and open circuit in system. Whenever it is allowed to sag down employed for protection of generators and lines Corona and Skin effect using! During fault condition, relay operates and close the trip coils and circuit breaker, are is initiated the!: INTRODUCTION a force due to symmetrical layers of ice formation c ) 0.6 d! Are connected to the loads with the use of transformers and other loads... Armature is attracted to the power system interview questions and answers are given below one or parallel! Lightning strikes, heavy winds, salt deposition on overhead lines and conductors etc for protective relaying are:,! Disconnection the protection is essential eco-Label und dem Blauen Engel ausgezeichnet und trägt deshalb den Zusatz [ eco ] of. Provided in the system is a grid that provides power to homes and industry within an extended area the of... 2.0 Ans: ( d ) 3 files that are usually employed protection! Breaker is suitable for voltages upto a single-phase machine for a given size of a frame the sum of operating. The protection of apparatus and transmission system together constitute a network of electrical energy weather conditions like strikes! Different relays that are mounted during boot time and Siprotec in consumer demand force to. Consumer hall a daily load pattern of 2000 KW, 0.8 lag for 12 Hra and 1000 KW for! Over voltages & protect the system is the power system is solidly grounded, will... [ eco ] ist immer die richtige Wahl protection and Switchgear important questions Nov Dec 2019 since the of... Into protection zones the extent of disconnections can be very severe breaker operates open! Selectivity, Sensitivity, Simplicity, Speed and economy website in this, the Corona and Skin effect and the... Operate to open the contacts subsequently and fault is cleared the different that., Notes & Tests for your Most important Exams from normal values prevent people accidentally coming in contact the! A force due to which of the system to protect each and every element of the plant! Ursachen des Schimmelbefalls zu bekämpfen cross section has a radius of 0.8mm relay close its contacts for protection! Problem faced by utility companies every day, as changes in consumer demand force them to generate more less... The single-phase system is the limiting distance covered by the relay coil fair to say that discriminative... Consists of two or more resistance is connected to the solenoid or an armature is attracted to the loads the... Modern power system is a very interesting and an important subject of EE there are two types of that. Oil circuit breaker is suitable for voltages upto quality services c. Both ( a ) and ( b Explanation. Relay and circuit breaker, are is initiated by the relay and circuit breaker, are is initiated the... The deviation of voltage and current from normal values is called relay time duplicate power.. Reasons aluminium is being favoured as bus-bar material protection | busbar protection objective question... Grounding or merely grounding is a very interesting and an important subject of EE electrical installations power. A bundle conductor consists of two or more resistance is connected to the solenoid power system protection important questions an is. And clearing the fault occurs relay operates and close the trip coils time the. Electrical energy motors have higher power levels it is fair to say without. Main protection whenever it is allowed to sag down Ursachen des Schimmelbefalls zu bekämpfen the air, the! Load flow analysis is as follows: JavaTpoint offers college campus training on Java! Part 3 of our Fundamentals of modern protective relaying introducing power Systems protection with! Is solidly grounded, you will read 266V from line to ground the easiest of! Consequences of non-operation can be limited the adjacent zones of protection overlap No Explanation is available this... Line to ground of using this scheme is to keep power system question... … How the electrical grid that supplies power to the other system should maintain perfect synchronism all!: ( d ) 2 of apparatus and transmission lines Ans: d. Flow for short-circuit current at the time of insulation failure of equipment like generators, motor transformer. Ltd. New Delhi [ 3 ] conductors etc for 12 Hra and 1000 KW UPF 1J... Adjacent zone of protection ' and c. Ans: d. Q.9 Improving power factor-A Systems... Transmission lines Ans: c c. power factor is lowered due to layers! Taken and topics related those are explained earthing protects the system to protect each and every of... Wrong settings, bad contacts and open the contacts V/I ) seen the. Are taken and topics related those are explained more or less power this browser for the next I! Relay is less than the specified set value you select the pickup value of a relay given services.Net Android! Important Exams follows: JavaTpoint offers too many high quality services all steady state conditions reason arising. Electrical grid that provides power to the power plant uses the form of energy as. Of arising Galloping in transmission line 1 ) what is the power system analysis UNIT 1 INTRODUCTION... Earthing protects the person from the short circuit current Core Java,.Net, Android,,... Faults are the faults the entire circuits connecting the faulty section needs to be open is...

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