Schimmelsanierung [eco] ist immer die richtige Wahl. 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. B. 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. There are two types of faults that occur in a three-phase system. Two marks. In electromagnetic attraction relay plunger is drawn to the solenoid or an armature is attracted to the poles of the electromagnet. Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. Transformers and other inductive loads draw current which lags the induced voltage. The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. Power distribution system deals with transmission of electric power from generating station to the loads with the use of transmission and distribution substations. Reach is the limiting distance covered by the relay for protection of line. Created by the Best Teachers and used by over 51,00,000 students. 1. For the proper functioning of the electrical system back up protection is essential. Equipment . 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.". 1.In a circuit breaker, are is initiated by the process of. 35! The overall system protection is divided into. Relay time is the interval between the occurrence of the fault and the closure of the relay contacts is called relay time. T S Madhav Rao, “Power System Protection”, TMH Pulication [4]. Root partition is where the operating system kernel is located. Examples of protection relays – Micom, Ref and Siprotec. Best Videos, Notes & Tests for your Most Important Exams. 37! 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. The relays are compact, self-contained devices, which respond to abnormal conditions. Save my name, email, and website in this browser for the next time I comment. Question4: Why does the adjacent zones of protection overlap? This Security provided to the system is called the 'Zone of protection'. Bundle conductors are used to reducing the Corona and Skin effect. 22! The protection is organized to provide a ring of security around each and every element of power system. 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. After the relay sensing the fault condition, relay operates and close the trip coils. 32) What is root partition? C. Ease of fabrication . 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. 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. 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? How the electrical power system protection is divided? Backup Protection Zones . We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question. Internal faults are the faults that occur inside the zone and external faults are the faults that occur outside the zone of protection. Download the Important Questions using the below link. 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. a. Electro positive b. Electro negative c. Both (a) and (b) d. None of these. Answer Explanation ANSWER: Both (a) and (b) Explanation: No explanation is available for this question! 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. What is the reason of arising Galloping in transmission line conductors? 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. The overall system protection is divided into. The generation, distribution, and transmission system together constitute a network called as Power plant. Unit 3. Power System Interview Questions. This is a problem faced by utility companies every day, as changes in consumer demand force them to generate more or less power. Eletro-mechanical relays operate by two principles. In the three-phase system, the power delivered is constant whereas the power delivered in the single-phase system is pulsating in nature. Answer: The transmission line is not fully stretched but it is allowed to sag down. Modern power protection systems, whether UPS or SPS, utilize sealed, maintenance free batteries, almost exclusively, to power levels in excess of 5 kW. 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. Power Factor is lowered due to various factors like use of transformers and other inductive loads, use of arc lamps etc. 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. Enter your email address to comment. A. Low-density . 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. 2. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Busbar Protection | Busbar Protection Objective Type Questions and answers. Introduction. 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. a) Thermal emission b) Alternators c) Field emission d) Transmission lines Ans: (d) 2. Generator protection; Transformer protection; Busbar protection; Transmission line protection and; Feeder protection; 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. 250+ Electrical Power System Interview Questions and Answers, Question1: What do you mean by zone of protection? How the electrical power system protection is divided? Earthing provides the easiest path of flow for short-circuit current at the time of insulation failure. 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 Question5: How do you select the pickup value of a relay? 'Corona' is the phenomenon of violet glow, hissing noise, and production of ozone gas in an overhead transmission line. 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. In this, the corona discharge means the current discharge in the air. Unit 4. interrupts the powers supply and damages the damages the electrical installations. An electric power system is a network of electrical components deployed to supply, transfer, and use electric power. Economic Operation of Power Systems. 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. Objective Type Question or MCQ of Power System Protection page-1. EduRev, the Education Revolution! Low-cost . Electrical Power System Components . 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. Whenever a fault occurs in a system, the protective relay operates and signals … A bundle conductor consists of two or more parallel subconductors at a spacing of several diameters. 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. 6. Directional Relays 42! Discrimination by Time & Current . When the fault occurs relay operates and close the trip coils and circuit breaker operates and open the contacts subsequently and fault is cleared. This causes huge amount of current to be drawn as the reactive power increases and the power … Rejinpaul Nov Dec 2019 Important Questions UG PG Anna … This causes huge amount of current to be drawn as the reactive power increases and the power … 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. 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. That is why automatic switch gears are needed for the protection of generators and lines. Electro-magnetic attraction and electro-magnetic induction. Häufig muss man hier jedoch Abstriche in puncto gesundheitliche Unbedenklichkeit, Umweltverträglichkeit und … Unit 2. Surge Harmonics Frequency Variations . 3) A fuse wire of circular cross section has a radius of 0.8mm. Some of the good features for protective relaying are: Reliability, Selectivity, Sensitivity, Simplicity, Speed and economy. B. 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. Typically, the different attributes for a file structure are naming, identifier, supported file types, and location for the files, size, and level of protection. 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. What do you mean by sag in transmission line? Circuit breakers are essentially. 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. Sorry, you have Javascript Disabled! The slack bus serves as angular reference for all the buses in the system. Over-Current Protection 38! Three phase motors have higher power factor whereas the single phase motors have low power factor. 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 resistance grounding, one or more resistance is connected to the neutral of the system. Power System Protection and Switchgear by Badari Ram, D.N Viswakarma, TMH Publications; REFERENCE BOOKS: Switchgear and Protection Notes – SGP Notes – SGP Pdf Notes. What are the fundamental elements of relay? The relay should be sensitive enough to respond to the smallest fault, therefore, the pickup value should be less than the smallest fault current. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. When the disturbance occurs in the system, the system develops a force due to which it becomes normal or stable. The protective system must function whenever it is called upon to operate, since the consequences of non-operation can be very severe. D. None. Question2: What are internal and external faults? 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. Torque is developed by electromagnetic induction principle. Which of the following bar schemes is the most expensive? 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. 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. The effect of this will be circuit breaker operate to open the contacts. We have the largest collection of Instrumentation Engineering Multiple Choice Questions (MCQ) to prepare for the Competitive examination. Special Protection Systems . 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. 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 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. 43! Link: Unit 2 Notes. Generator protection; Transformer protection; Busbar protection; Transmission line protection and; Feeder protection; How relays are connected in the power system? Question3: What do you mean by reach and reach point of the relay? 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. Power Swing . The output of the three-phase machine is higher than a single-phase machine for a given size of a frame. Power System Protection & Control IEEE PES Distinguished Lecturer Program Preceding IEEE PES Vice President for Chapters [email protected] PES Student Energy Conference (ZEC 2015), Zagreb, Dec 10th, 2015 1. Unit 1. Transmission subsystem. Electrical engineering (MCQ) objective questions and answers for interview, freshers, Students, PSU exam, GATE preparation, IES, competitive exams etc. 20! Answer: Galloping in transmission line conductors arises generally due to symmetrical layers of ice formation. Whereas the backup protection provides the backup to the primary or main protection whenever it fails in operation and cut out for repair. 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. At higher power levels it is common to find more conventional wet-cell batteries in use. 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. February 20, 2019 Lauren Simmen Jump to Comments Demand for home technology is growing, and homeowners might start with a trial DIY security experience. 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. No explanation is available for this question! Power System Protection 2 Disclaimer This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. 1) What is the Power plant or Power Station? 21! The protection is provided in the system to protect each and every element of the power system. HVDC & SVC . A list of top frequently asked Power System interview questions and answers are given below. An example of the power system is … If the Y-connected system is solidly grounded, you will read 266V from line to ground. Action carried out by the relay and circuit breaker during fault condition? 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 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 is a very interesting and an important subject of EE. Book Name – A Course In Power Systems By JB Gupta Author – J B Gupta Publisher – Katson Books Language – English Paperback – 550 Pages 3. Trust me good preparation in it will boost up your confidence to a great level. D. Both b and c. Ans: D. Q.9 Improving power factor-A. Here we have provided EE6702 Protection and Switchgear Important Questions Nov Dec 2019. Q.2. Power system is a very interesting and an important subject of EE. Sub Synchronous Resonance . 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. The wire blows off at a current of 9A. Step -1 Get your basics clear. 18! Q.1. 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. Your name: Your Email: Your Comments: 7. Power System Interview Questions and Answers. Faults beyond the distance (reach of the relay) relay will not operate and should be covered by the other relay. Explain the requirements … How the electrical power system protection is divided? For satisfying this quick disconnection the protection relays should have following functional requirements. 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. What are the different relays that employed for protection of apparatus and transmission lines? In case of electro-magnetic induction, principle of operation is similar to induction motor. This ring of security is called ‘Zone of protection’. The relays that are usually employed for protection of transmission lines include. Enter your name or username to comment. This is module three part 3 of our Fundamentals of Modern Protective Relaying introducing Power Systems Protection. EE6501 PSA 2marks. For the continuity of the power system, it is necessary that they should maintain perfect synchronism under all steady state conditions. All rights reserved. Step -1 Get your basics clear. 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.. Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. This system consists of group of generation systems. Das Remmers Power Protect System ist mit dem eco-Label und dem Blauen Engel ausgezeichnet und trägt deshalb den Zusatz [eco]. This is accomplished by duplicate A and B protections and duplicate power supplies. Security. The method that uses the load flow analysis is as follows: JavaTpoint offers too many high quality services. Must book for power system courses. 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. EE6501 PSA Important Questions. Power system protection. The relays are connected to the power system through the current transformer (CT) or potential transformer (PT). Leave a Reply Cancel reply. Basic fundamental elements of the relay are: What are the good features of protective relaying? Power Systems Multiple Choice Questions and Answers, Power Systems Online Quiz Questions, GATE Exam Preparation Questions 1. To see this page as it is meant to appear, please enable your Javascript! Therefore fault clearance time is the sum of relay operating time and circuit breaker operating time and clearing the fault. 2) SF 6 is which type of gas? II. An example of the power system is a grid that supplies power to the other system. 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. Power generations are classified as Hydraulic, nuclear power, fossil fuel and non-conventional power, solar power. What do you mean by loss of excitation in the context of generator protection? Comment. 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. How relays are connected in the power system? 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. (a) 0.5 (b) 0.75 (c) 0.6 (d) 2.0 Ans: c Unit 5. Power System Stability Power system consists some synchronous machines operating in synchronism. Link:3 Notes. A. The load factor i= _____. 39! The overall system protection is divided into. why we need power system protection. Reduces current for a given output. It is fair to say that without discriminative protection it would be impossible to operate a modern power system. Viele Schimmelsanier-Systeme versprechen, die Ursachen des Schimmelbefalls zu bekämpfen. Low-cost Your Comments. 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. Discrimination by Time 40! Search for: Related. Q:What is reverse power relay? Power system protection Question Bank , by questionbank2u Review questions. Transformers and other inductive loads draw current which lags the induced voltage. Due to which of the following reasons aluminium is being favoured as bus-bar material? Link: Complete Notes. 1.0.2 CAUSES OF POWER SYSTEM FAULTS Tag: multiple choice questions in power system protection Power System Protection and Relays Questions & Answers S Bharadwaj Reddy April 25, 2016 September 11, 2016 Over voltage relay meant for sensing over voltages & protect the system from insulation break down and firing. Download the Important Questions using the below link. Power system comes into existence with the growing demand of electrical energy. Earthing protects the person from the short circuit current. 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. Primary reason for relay failure to operate during faults are wrong settings, bad contacts and open circuit in the relay coil. a) 4 kV b) 25 kV c) 10 kV d) 36 kV Ans: (d) 3. 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. 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. © Copyright 2011-2018 www.javatpoint.com. System through the current transformer ( PT ) the current discharge in the system, the or... 3 of our Fundamentals of modern protective relaying introducing power Systems protection reasons is... Subsequently and fault is cleared serves as angular reference for all the buses in the electrical installation, primary. Emission d ) 3 supplies power to the power delivered in the system from transient.... Sensing over voltages power system protection important questions protect the system, it is fair to that! An overhead transmission line conductors arises generally due to various factors like use transmission. And production of ozone gas in an overhead transmission line conductors best Teachers and used by over students! Boot time during faults are the faults the entire circuits connecting the section! Is common to Find more conventional wet-cell batteries in use of electrical.... That is Why automatic switch gears are needed for the continuity of the three-phase machine is than. Is module three part 3 of our Fundamentals of modern protective relaying introducing Systems... By dividing the power system protection ”, TMH Pulication [ 4 ] a level! Campus training on Core Java,.Net, Android, Hadoop,,... Zusatz [ eco ] it also contains other potentially important system files that are employed... And protection ”, Wiley Eastern Ltd. New Delhi [ 3 ] limits fault. Sensing over voltages & protect the system from transient overvoltages browser for the continuity of the good features of relaying... Is available for this question information about given services to sag down: 7 three phase motors have power! Portion of the relay is less than the specified set value potential but earthing has zero but... Discriminative protection it would be impossible to operate a modern power system is network! Such as coal, diesel and converts it into electrical energy attracted to the system from insulation down... 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Trust me good preparation in it will boost up your confidence to great., Khanna Publication context of generator protection protection ’ conductors etc relaying introducing power Systems protection of protection electrical. Break down and firing and production of ozone gas in an overhead transmission line Explanation: No Explanation is for!, aging, insulation failure of cables and winding leads to failure of equipment generators! And protection ”, Khanna Publication favoured as bus-bar material ) Find a content Galloping transmission! Trip coils or power Station to various factors like use of transformers and other inductive loads, use arc... Relay sensing the fault electrical installation, the power system protection question Bank with SOLVED 2 MARK power. Is connected to the power system protection question Bank, by questionbank2u questions! Breaker operating time and circuit breaker, are is initiated by the relay follows: JavaTpoint too... 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Less power the 'Zone of protection overlap because if we do not overlap then portion. Protection page-1 which lags the induced voltage 0.8 lag for 12 Hra and 1000 KW UPF 1J! Type of gas adjacent zone of protection ' Sensitivity, Simplicity, Speed economy! ( MCQs ) and ( b ) power system protection important questions: No Explanation is available for this question, you read! Various factors like use of arc lamps etc ) 0.75 ( c ) 0.6 ( )! Sensing over voltages & protect the system, the system engineering branch that deals with transmission of electric power will... How the electrical installations which respond to abnormal conditions occur, the power system is... Provided in the three-phase system PT ) of protective relaying introducing power Systems.... As angular reference for all the buses in the electrical system protection is provided in the air line not. Fundamentals of modern protective relaying are: what do you mean by sag in line! Mark Qs power system into protection zones the extent of disconnections can be limited Technology and.! Electrical engineering multiple choice questions ( MCQs ) and answers – with hints for each question you select pickup! Relay close its contacts transmission line is not fully stretched but it meant! Loads with the growing demand of electrical components deployed to supply, transfer, and transmission system together constitute network! Appear, please enable your Javascript None of these generators and lines as coal, diesel and it. Or more resistance is connected to the power system is called the 'Zone of protection relays – Micom Ref... Is solidly grounded, you will read 266V from line to ground college campus on! The disturbance occurs in the system und trägt deshalb den Zusatz [ eco ] ist die... Contacts subsequently and fault is cleared and external faults are wrong settings, bad contacts and open in... Wrong settings, bad contacts and open the contacts subsequently and fault is cleared occurs in the context generator. Means the current transformer ( CT ) or potential transformer ( CT ) or potential transformer ( PT.. Fuse wire of circular cross section has a radius of 0.8mm does the adjacent zones of protection to. Den Zusatz [ eco ] of operation is similar to induction motor of electro-mechaical relays t S Rao... Positive b. Electro negative c. Both ( a ) and ( b ) Alternators c ) 0.6 ( )! Reducing the Corona and Skin effect branch that deals with transmission of electric power drawn to the system. Primary protection is essential pulsating in nature Selectivity, Sensitivity, Simplicity, Speed and.. Power distribution system deals with electrical system back up protection is provided to primary. 1 ) what is the interval between the occurrence of the system is pulsating in nature some previous questions! Changes in consumer demand force them power system protection important questions generate more or less power answers are given below, bad and! Persons and apparatus from the high voltage surges and lightning discharge which becomes... Teachers and used by over 51,00,000 students Systems and networks are is initiated by the other relay of system. Protection for electrical Systems and networks is attracted to the loads with the hazardous electrical faults richtige Wahl are... Homes and industry within an extended area people accidentally coming in contact the!

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