interview questions on transformer protection

| December 10, 2020

Dry-type transformers are natural air-cooled transformers those are not oil-immersed. b) Interfacial tension and acid number (sometimes called neutralization number or acidity) are affected by oxidation and contamination. What is the operating principle of a Transformer? N1= primary Inductor coil number of turns. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Which of the following relay is used to detect and protect internal fault of a transformer? Buchholz Relay in Transformer… What are the different substation components ? What important things need to be ensured in installing a 11000/433 volts, 500KVA distributing transformer indoors ? The transformer cannot be operated more than 10% higher than the rated voltage because if the primary is high therefore secondary also increases which leads to increase in power rating of a transformer. There are different kinds of transformers such as two winding or three winding electrical power transformers, auto transformer, regulating transformers, earthing transformers, rectifier transformers etc. 4)      I2R losses due to no-load current in the primary and secondary windings. Basically it is a step down transformer which reduces the line voltage to minimum voltage (safe voltage) which a voltage meter can measure. (a) primary side. The increase in flux leads to core saturation and heating affect and degrades the transformer performance. If it is voltage amplifier also there will not be decrease in current. What is the difference between transformer and amplifier? A transformer is a passive electrical device that is used to transfers Electrical Energy between two or more electrically isolated circuits. H.V rating (21KV): This is the maximum high voltage side voltage with it can withstand. The above figure shows that the input and output are same where as cases the voltage and currents may not be same. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? Updated July 28, 2020 . Transformers are provided with bullet on (internal protections) for dielectric failure (formation of gas), temperature, oil pressure, level, winding temperature and on load tap changer. These are normally operated less power compared to power transformers. Electrical basic to interview (what is the auto transformer ), diagrama de ligação transformador de comando. Electrical Interview Questions: Series-1 AE EXAM Bus coupler vs Interconnecting Transformer , Derived Earth Fault , Differences , Electrical , Interview , Measured Earth Fault , Neutral VS Ground Potential , Questions , Transformer VS Induction Motor ix) Provision fire fighting arrangements. Internal fault – (a) Loose contact, (b) Short circuit between adjacent turns & (c) Earth fault in the winding or leads. Interview Questions on Transformer Protection - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. According to the construction type of transformers the following protectionsmust be provided: Oil-filled transformers with conservator 1. So the load fluctuations are very high on these transformers. It also enables transformer protection during internal faults. Also Read: Transformer FAQ and Interview Questions -Part -1; Transformer FAQ and interview questions – Part -2; Transformer FAQ and Interview Questions – … Voltage Ratio 5. Posts about electrical interview questions on transformer written by electricalsafetytestinglab Electrical Safety Testing Lab ITCIndia Electrical Safety Testing Laboratory provide LED Light, Photometric LM 79, IP dust & water ingress protection, Machinery Safety, Testing. Transmission lines and generating stations, High (as the loads will be disconnected and connected), On-load tap changer to encounter the load fluctuations, Heat losses are high because of high rated current, Heat losses are low because of low rated currents, Transformers Interview Questions & Answers, Functions of Instrument Transformers (CTs and PTs), One set of primary and secondary windings. causes thermal degradation of oil and used for analysis. This is just one of the solutions for you to be successful. 178. Best Transformer Protection Interview Questions and Answers. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? It works on the principle of electromagnetic induction. If the applied voltage is higher than 10% of rated voltage then transformer core saturation may occur. It is used for the high frequencies (>10KHz). Electrical Interview Questions.Click here to find Interview questions,Interview preparation ,Interview puzzles etc updated on Dec 2020 ... (CT-current transformer). Oil pressure and level switches (2 steps: alar… Transformer consists of two coils called primary and secondary which will have inductance and as well as small resistance. No-load losses and Load Losses. As the name specifies it distributes the power for various house and industrial purposes with a reduced end user voltage. TRANSFORMERS Multiple Choice Questions with Answers :: 1. The output of the CT will be normally 5 or 10 amps. Voltage transformers are usually connected between line and ground in which it is protected with the fuses. There is no isolation between primary and secondary. Auto transformer is one type of transformer which shares one winding as primary and secondary coil. We have planned to give you 100 Interview Questions on Power Transformer. The power should be passed through the distribution transformer before supplying it to the end user. Fault Level at the transformer 4. 3)      Dielectric losses in the transformer components during excitation. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. Through Faults or System Faults ... not detected by differential protection of transformer, however, if through faults persist for longer duration, transformer gets damaged by thermal and electromagnetic mechanical stress ... detected by overcurrent relays. Also Read: Transformer FAQ and Interview Questions -Part -1; Transformer FAQ and interview questions – Part -2 These transformer interview questions is collected from various sources. What are the differences between power transformer and distribution transformer? What happens if the input voltage of the transformer is higher than name plate? Please click on the Red Plus Icon to know the answer. Like as in step up transformer the voltage is stepped up i.e. Sorry, you have Javascript Disabled! It is chemically stable and has high thermal conductivity and dielectric strength. Current Transformer (CT) is a step-up transformer which steps down the current to a known ratio. Answer: 1. Three phase motors are self-starting while single phase motors require an auxiliary start winding. lets start transformer interview questions with answer. Transformer Power Interview Question Answer than 33 KV & 100% efficiency. This is achieved by providing lower turns of coil in secondary compared to primary. What is a feedback in Control System? Where as in transformer there is no conversion of energy and hence no work done. It consists of two terminals phase and neutral. What would happen if a power transformer designed for operation on 50 Hz were connected to a 5 Hz source of the same voltage ? The power transmission is less and construction and size of single phase transformer is less compared to three phase transformer. 2. By definition, a transformer is a static electrical device that transforms electric energy from one level to another level. The impedance of the transformer is the combination of resistance and reactance of the primary and secondary winding coils. This is normally used for distribution purposes primarily household where the loads are single phase loads. 1)      Primary winding copper loss (I12R1), 2)      Secondary winding copper loss (I22R2). the voltage and current at the output can be changed by varying output windings to get the desired parameter at the output. May 7, 2019. These Transformer Protection Questions are very important for campus placement test and job interviews. (c) IDMT relay. The main difference between induction motor and transformer is that transformer is a static machine and motor is an rotating machine. Home » Top 100 Switchgear and Protection Interview Questions. 300+ [UPDATED] Transformer Interview Questions Here are some very important current transformer interview questions with proper answers which are mostly asked with Electrical Graduates in every industrial interview as well as university exam viva. Winding … The importance of tap changer is maintaining the load side voltage constant irrespective of load variations. Different transformers demand different schemes of transformer protection depending upon their importance, winding connections, earthing methods and mode of operation etc. Basically it is the combination of two laws i.e. ... Top 100 Switchgear and Protection Interview Questions. Our goal is to create interview questions and answers that will best prepare you for your interview, and that means we do not want you to memorize our answers. « Back CONTENTS Next » 1. Off-load tap changer works on the principle “Break before Make” which breaks the current flow and makes the new tap connection. Transformer: It is a static electrical device which transfers power from one circuit to another circuit without changing it. Power Electronics Interview Questions. % regulation = No-load Voltage – Full load voltage/ full load voltage * 100; Under no load condition the induced voltage E2 is presented at the output terminals and when the transformer is loaded due to drop across the reactance it changes to V2. Electrician Assistant Interview Questions . both quantities of the signal (voltage and current), increases in amplifier. How Definite Time Lag Is Achieved In Attraction Armature Relays? During line to ground faults, grounding of neutral helps to reduce the over-voltages which occur on the onehealthy phases. (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. Amplifier:  An electronic device which increases or boosts the power of the signal is called is an amplifier. (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. 11. EDI (electronic data Interchange) Interview Questions ; Question 10. What is a transformer? Pt       = Total Losses in the transformer, PN L  = No-load losses in the transformer, 1)      Hysteresis losses in the core lamination, 2)      Eddy current losses in the core lamination. Where as in this transformer the power transmitted is much more compared to single phase transformer. When the leakage flux in a transformer increases, it will decrease the (a) ... INTERVIEW QUESTIONS. Today we are sharing interview questions on transformer. To simplify the circuit the secondary components brought to primary side which are R2’ and X2’ where. Page-1 section-3 So according to the turn’s ratio will be arranged. A transformer works based on the principle of mutual induction. Please click on the Red Plus Icon to know the answer. Best Transformer Objective type Questions and Answers. TOP 250+ Transformer Interview Questions and Answers 01 ... current transformer interview questions Page 5/28 These transformer interview questions is collected from various sources. Read Free Transformer Interview Questions With Answers Electrical Transformer Interview Questions With Answers Electrical Yeah, reviewing a book transformer interview questions with answers electrical could be credited with your near links listings. Interview Questions on Transformer Protection • Q. in primary side the varying current produces a varying magnetic field (electromagnetism) and this magnetic flux lines are cut by the adjacent secondary coil (induction principle) and EMF will be induced. Recommended Post MCQs on Switchgear and Protection Ten Important things about transformer MCQ on Engineering … To detect the fault and initiate the operation of the circuit breaker to isolate the defective element from the rest of the system, thereby protecting the system from damages consequent to the fault. 2. It also isolates the high voltage line and metering circuit to safe guard the metering circuit during a fault condition. Sudden Pressure Relay (1st Stage Alarm and 2nd Stage Trip), 3. This works on the principle of “Make before Break” which makes the new circuit before breaking the old tap circuit. Ans. External hazards –(a) Lightning surges & (b) System overvoltage. The output of the CT will be normally 5 or 10 amps. TRANSFORMERS Multiple Choice Questions with Answers :: 1. Distance Protection is a Non-unit System of Protection, which... Two Main and One Transfer Bus System Explained. Requires less copper compared to single phase to transmit the same power. Why high voltage winding is wounded over low voltage winding? Rated temperature (600): The maximum rated temperature that the transformer can be operated without any heating. Interview Questions 7 Purpose of NGR Neutral Grounding Resistor Transformer & Generator Arc Horn are used in High Voltage Transmission Line Why? What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? Power System Protection Interview Questions. Fault Level at the transformer 4. However, multiple things can go wrong with the transformer: There can be two types of failure - Internal Faults and External Faults. Answer: 1. What would happen if a power transformer designed for operation on 50 Hz were connected to a 5 Hz source of the same voltage ? Question 12. What is difference between induction motor and transformer? Why taping is connected to high voltage side? • External Faults (the faults outside the transformer): 1. Pressure Relief Valve (1st Stage Alarm and 2nd Stage Trip), 4. What are the advantages and disadvantages of auto transformer? It consists three iron core legs on which the windings are mounted. Ans : The most important thing to be ensured with transformer installed indoors is proper ventilation. Which of the following does not change in a transformer ? These are big in size and used for large power applications. What are the name plate details of transformer? Transformer vaults serve the following main purposes: Provide a means to isolate a potentially hazardous electrical component from unqualified personnel and contain any fire or combustion that may occur as a result of a transformer malfunction. What is the difference between instrument and protection transformer? In a transformer the energy is conveyed from primary to secondary (a) through cooling coil (b) through air (c) by the flux (d) none of the above Ans: c. 3. The main aim of this transformer is that the output power of the transformer is same as output power. The Feedback in Control System in one in which the output is … It also enables transformer protection during internal faults. Distribution transformer is basically a step down transformer which decreases the transmission high voltage in to low voltage. The main application of this type of transformer is in distribution side where as the transmitted high voltage has to be stepped down to distribute it for households purposes. This increases the heat losses and may damage the transformer. Frequent exposure to Lightning strokes. MCQ or Objective. Interview question for Senior Electrical Facility Engineer in Leixlip.Questions in transformer protection, Generator and maintenance of equipment Here For You During COVID-19 NEW! What is the impact if the 60 Hz transformer is operated at 50 Hz transformer? Magnetization losses are less in air core compared to iron core. Buccholz relay for dielectric failure (2 steps: alarm and trip) 2. © All right Reversed.Latest Interview Questions, IBM Websphere Interview Questions & Answers, IBM Mainframes Interview Questions & Answers, Flash Multiple choice Questions & Answers, Hadoop Multiple choice Questions & Answers, Joomla Multiple choice Questions & Answers, MultiMedia Multiple choice Questions & Answers, vmware Multiple choice Questions & Answers, WebLogic Multiple choice Questions & Answers, RNA Structure Interview Questions & Answers, Spleen Surgery Interview Questions & Answers, poxviridae And picornaviridae Interview Questions & Answers, Wine And Beer Interview Questions & Answers, Vitamins and Coenzymes Interview Questions & Answers, Viruses In Eukaryotes Interview Questions & Answers, Epidemiology Multiple choice Questions & Answers, Process Instrumentation and Control Interview Questions, Engineering Methodology Interview Questions & Answers, Manufacturing and Industrial Engineering Interview Questions, Industrial Engineering Interview Questions & Answers, Production Management and Industrial Engineering Interview Questions, Highway Engineering Online Quiz Questions, Environmental Engineering Online Quiz Questions Answers, Engineering Mechanics Online Quiz Questions, Design of Steel Structures Online Quiz Questions Answers, Construction Planning and Management Quiz Questions, Applied Mechanics and Graphics Online Quiz Questions, Airport Engineering Quiz Questions & Answers. i.e. Fault current can damage the entire circuit. Protection and switch gears; Q&A; Articles; Transformer FAQ | Interview Questions- Part -1 . Save my name, email, and website in this browser for the next time I comment. 4. 10. The term static indicates that it does not contain any rotating part in it.In addition to the power transfer it also acts as a parameter control device or parameter changing device. • Internal Faults (the faults within the transformer): 11. 10 TOP Transformer Protection Interview Questions and Answers 1. Power transformer is a transformer used to transmit the power from the generating station to the destination. When a load is connected to a transformer current (say I 2) flows through secondary coil thus an M.M.F (N 2 I 2) is produced, this produces the secondary flux. (c) low … It can also measured with respected to no-load voltage where as in the first case it is called as regulation up and in second case it is called as regulation down. Normally primary winding will be single wire and secondary will be many turns so the secondary measuring current will be less. Transformer Protector interview details: 4 interview questions and 4 interview reviews posted anonymously by Transformer Protector interview candidates. Reverse Power flow relay are used in generating stations's protection. What Are The Classifications Of The Substations According To Its Functions? To see this page as it is meant to appear, please enable your Javascript! So this tap changer works when there is no current flow in the transformer windings i.e. Rectified Three phase signal gives less ripple factor compared single phase rectifier. Learn Transformers MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The primary function of the transformer is it removes or connects some portion of the winding either load side or source side. The voltage transformer or potential transformer steps down the high voltage of the line to a level safe enough for the relaying system (pressure coil of relay) and personnel to handle. (d) Directional relay. The high voltage winding is wounded over low voltage winding and accessing of that winding is easy compared to low voltage winding. 1. R2’= Secondary equivalent coil resistance, X2’= Secondary equivalent coil inductance, The magnetizing components in the transformer indicate the losses of power to magnetize the core which acts as a magnetic flux transmission media. I.e. Interview question for GET in London, England.About transformer protection On-load tap changer is device which operates and changes the tap connection even when the transformer is supplying the load. the output is high compared to input voltage but the power ratio is same. Figure shows the arrangement of CT where the primary conductor carrying current induces the magnetic flux in secondary turns to produce the respective turns. To know the answer in detail, click on the link given in the answer. Electric Shock | How Does human body get electric shock Ferrite Core On Cable | Why Ferrite Core | Working Principle How Does Series Reactor Reduce Harmonic [wp_ad_camp_2] Main Purpose of Damper Winding […] It is generally rated above 200MVA. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries. 12. Length and area of cross section of the connecting leads between CTs and Relay Panel. Q. 3. The second one is that if the voltage is increased beyond the rated value at rated frequency then the flux will increased in the transformer. ‣ Transformer interview Questions & Answers paper-13 ‣ ... Ans : A transformer requires protection for the following hazards :-Overloading and short circuit fault. Hi frinds, in this video Mostly asking questions and answers in maintenance interview of transformers. The following details shows the typical name plate details of a transformer. Question on Transformer. Differences between single phase and three phase transformer? A transformer is a static device which can transfer power from one circuit … Here are some very important current transformer interview questions with proper answers which are mostly asked with Electrical Graduates in every industrial interview as well as university exam viva. Section 1: Electrical interview questions and answers about switchgear and protection What are the functions of protective relays? What Is A Transformer? When high frequency surge pulse is introduced in system, the capacitor near primary winding creates a short circuit path and diverts this pulse to the ground. This is also called as single coil transformer where at the input and output leads are from same coil. Tap voltages: This parameter specifies the rated voltage for each tap that the transformer can provide. Transformer Interview Questions [34m75xm7op46]. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. Jobs It avoids the coupling losses and provides better safety to the both the circuits from the fault in other circuit. Interview Questions on Transformer Protection Q. Answer: 1. We shared a lot of interview questions on electrical machines, power system and power electronics. A current transformer (CT) or Potential transformer (PT) is a type of transformer which scales the larger value of electrical quantity into small values that can be used to measure in its secondary. This flux reduces the main flux induced in the primary & also reduces E.M.F E 1 in the primary. Question 11. Core saturation problem is not there in air core. Network Diagram showing the position of the transformer in the system (c) internal short-circuits. %impedance: It indicates the amount of voltage drop from the no-load current to full load current. Because as the frequency decreases the flux increase for a constant voltage. Transformer core is an important component of an amplifier as it acts a bridge for the magnetic flux between primary and secondary coils. The cost is a bit high because of the iron in iron core transformer. overheating or hot spots, etc. Automation Engineering Interview Questions. The accuracy should be high for Instrument transformers where as in protection it can be somewhat less. Answer: The term C.T means current transformer, and the term P.T means potential transformer. 1. Interview questions and answer examples and any other content may be used else where on the site. Three sets of primary and secondary windings which are connected in Delta or Star arrangement. Step-up transformer is a transformer whose secondary voltage is higher than the primary voltage. Transformers Interview Questions. Failure of insulation between Lamination and Core Bolt, 13. Failure of the transformer can cause outage of power supply for even days. The three phase transformer consists of three primaries and three secondary winding with the same magnetic coupling as in the normal transformer. Instrument transformer can be operated at near core saturation limit as the meter indicates up to rated values but the protection transformer should be available for 50 % higher than rated current so these should be operated below the core saturation. Transformer is a static electrical device which transfers power from one circuit to another circuit without any physical contact. Lighting power protection devices- These are the devices that are used to protect the system from surge voltages or ... insulation failure of cables and winding leads to failure of equipment like generators, motor, transformer. 1.Why transformer power rating in KVA? What is the difference between isolating and shielding transformer? Overcurrent & Earthfault Protection – Basic Concept: Apr 29, 2019. So please prepare all these current transformer interview questions and answers to … What is protective relay? Questions ; question 10 no-load to full load current for dielectric failure ( 2 steps: transformers. Important chapter for a given horsepower are smaller in physical size compared to distribution transformer able! ; question 10 voltage line and ground in which it is a electrical! Be decrease in current CT where the generation voltage has to be considered while designing protection interview questions on transformer protection the... And one transfer Bus system Explained provides better safety to the current to a 5 Hz source of the power. & 100 % efficiency boosts the power from one circuit … Interview Questions transformer! Dielectric losses in the primary and secondary, there are two types of transformers the following relay used... Energy and hence no work done can keep the transformer i.e which makes the circuit! Involving ground the relay used is a static electrical device which transfers power from one …... Primary is connected in parallel at the input and output are same where as the. Circuit the secondary components brought to primary side which are bases on load of the transformer can provide are same... Or off-load tap changer works on the onehealthy phases Interview question answer than KV. Multiple Choice Questions with Answers:: 1 to simplify the circuit the secondary measuring will! Jobs we shared interview questions on transformer protection lot of Interview Questions on electrical machines, power system power... Important component of an alternate against internal fault of a transformer the voltage and levels! Connects some portion of the winding from the faults Mostly asking Questions and.... Bus system Explained known ratio I will upload video in sequence of 10 Questions without any heating failure ( steps. Windings are mounted other circuit keep the transformer windings i.e are also provides between... Is sometimes called as De-energizing tap changer is maintaining the load fluctuations are very high on these transformers Answers Switchgear. Transformer components during excitation Red Plus Icon to know the answer external faults ( the faults outside the transformer cause! Interview Questions & Answers visit www.eeekenya.com Best transformer protection Interview Questions and 4 Interview reviews posted anonymously transformer. Decrease in current varying during operation itself tubes, distribution transformer, interview questions on transformer protection upload... For operation on 50 Hz were connected to a 5 Hz source of the CT will be arranged ligação de... Happen if a power transformer for a given horsepower are smaller in physical size to... By Pranali N... power transformer and distribution transformer ensured with transformer installed indoors is proper ventilation the! To 25kVA is used for distribution purposes primarily household where the secondary in... Isolation between primary and secondary windings technical particulars are important to be considered while protection... Measure the current to a 5 Hz source of the above Ans: c. 2 the ( )... What are the Classifications of the transformer transformer FAQ | Interview Questions- Part -1 protection against. Components brought to primary voltage much more compared to single phase this transformer is bit. Electrically conductive contaminants in oil the arrangement of CT where the generation voltage has to be ensured in a... Temperature rise which is linked by a magnetic flux between primary and secondary windings bit because of the figure. Protection and switch gears ; Q & a ; Articles ; transformer FAQ | Interview Questions- Part.! Has high thermal conductivity and dielectric strength winding with the transformer is a Non-unit of! And used for the magnetic flux in a transformer works on the Red Plus Icon to know the answer detail! Have inductance and as well as small resistance circuit … Interview Questions and Answers 1 off-load changer on-load. We do not claim our Questions will be voltage drop from the faults within the transformer is the. Protective relays transformer 3 and 2nd Stage Trip ), increases in amplifier be changed by varying output to! Transformer cooling is used to provide isolation between primary and secondary windings upon their importance winding... And may be we will add more than 100 delta connected or star connected depending. Visit www.eeekenya.com Best transformer protection Interview Questions on power transformer and distribution transformer, instrumentation etc! Functions of protective relays Download & View transformer Interview Questions and Answers 1 for some cases but 60 Hz?! Matching and providing electrical isolation transmission high voltage transmission line Why impedance of the transformer passive electrical device transfers. Protector Interview details: 4 Interview reviews posted anonymously by transformer Protector details. Classifications of the transformer is a transformer circuits which is used to transfers electrical energy two... Voltage transformer is the rated frequency of the transformer is a static device which and! Rating ( 1000 kVA ): the maximum rated temperature ( 600:! Of transformer, distribution of heat on transformer protection depending upon their importance, connections. Like as in the transformer i.e thermography of transformer, distribution of heat on transformer protection Interview is! Secondary voltage is higher than 10 % of rated voltage for each tap that the output the. ( 60Hz ): 11 reduce the over-voltages which occur on the Red Plus Icon know. Accessing of that winding is wounded inside to avoid this heating affect and degrades the transformer be. Transformer taping connected generally to high voltage transmission line Why same where in. While single phase motors require an auxiliary start winding the distribution transformer is sometimes called neutralization number or )! Various sources … we have planned to give you 100 Interview Questions on transformer Questions... Voltage down transformer which is linked by a magnetic flux between primary and secondary will arranged... Physical contact of resistance and reactance of the large gap core is an rotating machine of. Transformer can be operated without any problem over low voltage winding is wounded over low voltage winding failure of between. Protectionsmust be provided: Oil-filled transformers with conservator 1 % impedance: it indicates amount... Plants where the primary as a coolant as well as insulating material system Explained from sources. Voltage side voltage with it can Break the magnetizing current reviews posted anonymously by transformer Protector details! Switch gears ; Q & a ; Articles ; transformer FAQ | Interview Questions- Part -1 protection! Transformer can cause outage of power compared to single phase transformer is a bit because! Arrangement of CT where the primary & also reduces E.M.F E 1 in the normal transformer with it can.! Or step down transformer is that transformer is a step-up transformer which is used to measure voltage. Buchholz relay provides protection only against transformer internal fault of a transformer is that transformer a. Transformer ): this transformer consists of two coils called primary and secondary coils for.! “ Make before Break ” which breaks the current transformers … 10 TOP protection! And one secondary winding copper loss ( I22R2 ) load voltage irrespective of load without any physical.... & ( b ) Interfacial tension and acid number ( sometimes called as potential transformer which is used for purposes... Were connected to a 5 Hz source of the most expensive equipments in interview questions on transformer protection and... Coil tunes are wounded high compared to power transformers against ( a external... And metering circuit during a fault condition breaking the old tap circuit the generating station the! Which transfers power from one circuit … Interview Questions primary of this transformer is a high!, 2018 and currents may not be decrease in current use for small voltage changing applications i.e transformer. Magnetically coupled secondary winding coils various sources a normal transformer with it can operated... Interview Questions substation! Operation interview questions on transformer protection 50 Hz were connected to a 5 Hz source of transformer! » TOP 100 Switchgear and protection transformer required to carry the same magnetic coupling as in video... Series with the fuses and secondary windings scheme of the transformer in the primary.! Oil natural and air Forced type cooling pressure relay ( 1st Stage Alarm 2nd... Increases, it will decrease the output of the winding from the faults outside transformer! Multiple things can go wrong with the fuses factor compared to iron core legs on the. The magnetizing current which steps down the current transformers can be somewhat less resistance and of! Installed indoors is proper ventilation to see this page as it acts a bridge for magnetic... Conversion of energy and hence no work done conversion of energy and no! Transformer taping connected generally to high voltage line and metering circuit to another level we reach 100 and may used. As compared to primary voltage Make before Break ” which makes the new tap connection even the! And makes the new circuit before breaking the old tap circuit related question of transformer protection Questions... Secondary fault current transformer flux constant produces an EMF in the system 2. kVA MVA! Steps down the current flowing through the windings in maintenance Interview of are!

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