1)      Primary winding copper loss (I12R1), 2)      Secondary winding copper loss (I22R2). Protection and switch gears; Q&A; Articles; Transformer FAQ | Interview Questions- Part -1 . Buchholz relay provides protection only against transformer internal fault. 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. Three phase motors have better power factor compared to single phase motor. In-addition to the above the name plate also contains about weight of the transformer, volume of the oil, type of insulating material etc. Current Transformer (CT) is a step-up transformer which steps down the current to a known ratio. Circuit Breakers, Disconnecting switches, Grounding switches, Current Transformers … It also enables transformer protection during internal faults. The cost is a bit high because of the iron in iron core transformer. Please click on the Red Plus Icon to know the answer. Power Electronics Interview Questions. 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. Power System Protection Interview Questions. The above figure shows that the input and output are same where as cases the voltage and currents may not be same. To see this page as it is meant to appear, please enable your Javascript! So the power is same. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? • Internal Faults (the faults within the transformer): 11. Bucholz Relay (1st Stage Alarm and 2nd Stage Trip), 2. To simplify the circuit the secondary components brought to primary side which are R2’ and X2’ where. 5. To know the answer in detail, click on the link given in the answer. Power transmission is high as the three phases combinely transmits high power, Transmission lines and power generating stations, Smaller in size (consists of only one winding). It also enables transformer protection during internal faults. There is no isolation between primary and secondary. Tap voltages: This parameter specifies the rated voltage for each tap that the transformer can provide. The importance of tap changer is maintaining the load side voltage constant irrespective of load variations. Biased differential relay B. Directional over … There are two types of tap changer one is off-load changer and on-load tap changer. It is very important invention that it can keep the transformer load voltage irrespective of load varying during operation itself. So please prepare all these current transformer interview questions and answers to improve your knowledge. These Transformer Protection Questions are very important for campus placement test and job interviews. Interview Questions 7 Purpose of NGR Neutral Grounding Resistor Transformer & Generator Arc Horn are used in High Voltage Transmission Line Why? (b) secondary side. […] 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. What is the impact if the 60 Hz transformer is operated at 50 Hz transformer? both quantities of the signal (voltage and current), increases in amplifier. What is Electrical Transformer? This works on the principle of “Make before Break” which makes the new circuit before breaking the old tap circuit. 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. If it is voltage amplifier also there will not be decrease in current. overheating or hot spots, etc. (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. The increase in flux leads to core saturation. 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. Value of the System Earthing Resistance, 11. In power transmission from primary and secondary, there are losses in the transformer which are bases on load of the transformer i.e. Transformers Interview Questions. Frequent exposure to Lightning strokes. Question on Transformer. A tap changer is a device used to change the primary or secondary voltage of the transformer by changing the turn’s ratio without remodeling the transformer. It is designed to use for small voltage changing applications i.e. ‣ Transformer interview Questions & Answers paper-13 ‣ ... Ans : A transformer requires protection for the following hazards :-Overloading and short circuit fault. The generation, distribution, and transmission system … Where as in transformer there is no conversion of energy and hence no work done. Transformer is one of the most expensive equipments in the Power System. 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. IDMT relays are used to protect the power transformers against (a) external short-circuits. Off-load tap changer works on the principle “Break before Make” which breaks the current flow and makes the new tap connection. Interview Questions on Transformer Protection Q. EDI (electronic data Interchange) Interview Questions ; Question 10. Answer : Transformer substation, Converting substation, Frequency substation, Switching substation, Power factor correction substation, Industrial substation. 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. Current transformer is an instrument transformer used to measure the current flowing through the windings. So according to the turn’s ratio will be arranged. Answer: 1. The current transformers can be used for metering purpose or for protection purpose. Even though the signal quantities (voltage and current) can be boosted at the output, it cannot acts as amplifier because if one of the quantities is boosted at the output the other quantity is reduced. 2. Over current relays with under voltage blocking, 1. This is achieved by providing lower turns of coil in secondary compared to primary. The accuracy should be high for Instrument transformers where as in protection it can be somewhat less. The primary function of the transformer is it removes or connects some portion of the winding either load side or source side. However, multiple things can go wrong with the transformer: There can be two types of failure - Internal Faults and External Faults. The transformer taping connected generally to high voltage winding side because. It has better overload capacity than the oil-immersed transformers. In high voltage side, the current is less and the flash over during tap changing is less in the case of on-load tap changer. Normally transformers are used to step up or step down voltage and current levels, impendence matching and providing electrical isolation. Distance Protection is a Non-unit System of Protection, which... Two Main and One Transfer Bus System Explained. The main aim of this transformer is that the output power of the transformer is same as output power. Three sets of primary and secondary windings which are connected in Delta or Star arrangement. According to the construction type of transformers the following protectionsmust be provided: Oil-filled transformers with conservator 1. The increase in flux leads to core saturation and heating affect and degrades the transformer performance. It is big in size as compared to distribution transformer, it used in generating station and Transmission substation. What would happen if a power transformer designed for operation on 50 Hz were connected to a 5 Hz source of the same voltage ? May 7, 2019. So according to the turn’s ratio will be arranged. It consists of two terminals phase and neutral. 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. What are the differences between power transformer and distribution transformer? Winding … 10. (c) internal short-circuits. Automation Engineering Interview Questions. Ans : The most important thing to be ensured with transformer installed indoors is proper ventilation. Dissolved Gas Analysis (DGA): Faults due to arcing, high current breakdown of oil, localized sparking, partial discharge of oil, localized. % 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. Figure shows the arrangement of CT where the primary conductor carrying current induces the magnetic flux in secondary turns to produce the respective turns. A CT produces current and PT produces the voltage at its secondary which is proportional to the current and voltage in its primary. Which of the following does not change in a transformer ? What are the functions of protective relays. Voltage Ratio 5. A PT primary is connected in parallel at the point where a measurement is desired. It avoids the coupling losses and provides better safety to the both the circuits from the fault in other circuit. Interview Questions on Transformer Also Read: Transformer FAQ and Interview Questions -Part -1; Transformer FAQ and interview questions – Part -2 Basically it is the combination of two laws i.e. Network Diagram showing the position of the transformer in the system, 8. 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 3. It also isolates the high voltage line and metering circuit to safe guard the metering circuit during a fault condition. Isolating transformer: This transformer is used to provide isolation between primary and secondary to protect the winding from the faults. On-load tap changer is device which operates and changes the tap connection even when the transformer is supplying the load. It works on the principle of electromagnetic induction. Three phase motors for a given horsepower are smaller in physical size compared to single phase. So please prepare all these current transformer interview questions and answers to … OverLoad ... increases copper losses and consequence temperature rise. When the leakage flux in a transformer increases, it will decrease the (a) ... INTERVIEW QUESTIONS. These are normally operated less power compared to power transformers. What is the difference between isolating and shielding transformer? 3)      Dielectric losses in the transformer components during excitation. I.e. Where N is the turns ration between primary and secondary. So the expression for transformer regulation is. Interview Questions on Transformer Protection • Q. Where as in this transformer the power transmitted is much more compared to single phase transformer. These transformers are also provides isolation between primary and secondary to limit the secondary fault current. Dear Readers, Welcome to Transformer Protection Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Transformer Protection.These Transformer Protection Questions are very important for campus placement test … What is the difference between instrument and protection transformer? Transformer works on the principle of Faraday’s electromagnetic induction principle where varying magnetic field produces an EMF in the electric coil. Answer: The term C.T means current transformer, and the term P.T means potential transformer. Best Transformer Objective type Questions and Answers. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. Oil pressure and level switches (2 steps: alar… Voltage transformer is sometimes called as potential transformer which is used to measure the voltage of the line. This is just one of the solutions for you to be successful. 1. Power transformer is a transformer used to transmit the power from the generating station to the destination. Best Transformer Protection Interview Questions and Answers. The following details shows the typical name plate details of a transformer. We will go on adding questions, till we reach 100 and may be we will add more than 100. Answer: 1. ... Download & View Transformer Interview Questions as PDF for free. What Is A Transformer? ... Top 100 Switchgear and Protection Interview Questions. What is Marshalling Kiosk in power transformer a) It provides alarms, trips, controls and indications from main transformer b) It is the base on which transformer rail is provided to pull and push transformer c) It is the pressure device ruptures when temperature inside transformer increases d) None of the above. © 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. (a) primary side. Why taping is connected to high voltage side? Hi frinds, in this video Mostly asking questions and answers in maintenance interview of transformers. TOP 250+ Transformer Interview Questions and Answers 01 ... current transformer interview questions Page 5/28 Best Transformer Protection Interview Questions and Answers. What are the different substation components ? Answer: 1. What is an equivalent circuit of a transformer? We will go on adding questions, till we reach 100 and may be we will add more than 100. 10 TOP Transformer Protection Interview Questions and Answers. Different transformers demand different schemes of transformer protection depending upon their importance, winding connections, earthing methods and mode of operation etc. Distribution transformer is basically a step down transformer which decreases the transmission high voltage in to low voltage. Induction Motor Interview Questions. 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 […] Sorry, you have Javascript Disabled! The secondary winding in induction motor is wounded on rotor to convert primary power in to rotational force. Earth fault protection is based on the method of neutral grounding; The system voltage during earth faults depends on the neutral grounding. The magnetic reluctance of iron is less so that it allows more flux through it. Today we are sharing interview questions on transformer. How Definite Time Lag Is Achieved In Attraction Armature Relays? What is the operating principle of a Transformer? What are the advantages and disadvantages of auto transformer? What Are The Classifications Of The Substations According To Its Functions? causes thermal degradation of oil and used for analysis. 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. The power transmission is less and construction and size of single phase transformer is less compared to three phase transformer. Network Diagram showing the position of the transformer in the system In this video I describe interview related question of transformer, i will upload video in sequence of 10 questions. We have planned to give you 100 Interview Questions on Power Transformer. it cannot work even when the transformer is energized because it can break the magnetizing current. (c) IDMT relay. Cooling class (ONAF): This indicates of type of cooling used in transformer. Frequency (60Hz): The rated frequency of the transformer with it can operated. Fault Level at the transformer 4. Click here to find Interview questions, Interview preparation, Interview puzzles, practice etc. lets start transformer interview questions with answer. 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. 10 TOP Transformer Protection Interview Questions and Answers 1. Single phase transformer is a normal transformer with one primary and one secondary winding which are magnetically coupled. We do not claim our questions will be asked in any interview you may have. A transformer works based on the principle of mutual induction. Core saturation problem is not there in air core. In circuit where measurements of high voltage and high current is involved, they are used there. (d) Directional relay. It consists three iron core legs on which the windings are mounted. The Feedback in Control System in one in which the output is … Q.1. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. This transformer has main application in power plants where the generation voltage has to be stepped up to transmit for long distance. Amplifier:  An electronic device which increases or boosts the power of the signal is called is an amplifier. Interview Questions on Transformer - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. 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 Power plant or Power Station? Voltage Ratio 5. Table of Contents . 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. 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. the voltage and current at the output can be changed by varying output windings to get the desired parameter at the output. That is electromagnetic induction between two circuits which is linked by a magnetic flux. 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. Overcurrent & Earthfault Protection – Basic Concept: Apr 29, 2019. Shielding transformer: In high power applications the isolation transformers are provided with shielding plates between primary and secondary to reduce the high frequency noise in the transformer. What is a feedback in Control System? In a transformer the tappings are generally provided on. Because as the frequency decreases the flux increase for a constant voltage. it can increase or decrease the output voltage a small bit because of one coil sharing. Magnetization losses are less in air core compared to iron core. 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. (a) Differential relay. This flux reduces the main flux induced in the primary & also reduces E.M.F E 1 in the primary. Dry-type transformers are natural air-cooled transformers those are not oil-immersed. Rectified Three phase signal gives less ripple factor compared single phase rectifier. Fault current can damage the entire circuit. So the load fluctuations are very high on these transformers. The high voltage winding is wounded over low voltage winding and accessing of that winding is easy compared to low voltage winding. High efficiency compared to single phase motor. Transformer: It is a static electrical device which transfers power from one circuit to another circuit without changing it. What happens if the input voltage of the transformer is higher than name plate? %impedance: It indicates the amount of voltage drop from the no-load current to full load current. MCQ or Objective. 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. (b) Bucholoz relay. Normally primary winding will be single wire and secondary will be many turns so the secondary measuring current will be less. See instructions. A transformer is a static device which can transfer power from one circuit … (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. Also using laminated cores especially, thinner core laminations can help in achieving better transformer efficiency by reducing core losses. The main difference between induction motor and transformer is that transformer is a static machine and motor is an rotating machine. ix) Provision fire fighting arrangements. Electrical Q & A . Sudden Pressure Relay (1st Stage Alarm and 2nd Stage Trip), 3. Transformer is a static electrical device which transfers power from one circuit to another circuit without any physical contact. Updated July 28, 2020 . The 50 Hz transformer can be operated at 60Hz for some cases but 60 Hz transformer cannot be operated for 50Hz. d) Power factor is also temperature dependent. A. the output is high compared to input voltage but the power ratio is same. 10 TOP Transformer Protection Interview Questions and Answers 1. What is the difference between transformer and amplifier? Auto transformer is one type of transformer which shares one winding as primary and secondary coil. Q. Question 12. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. 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. During line to ground faults, grounding of neutral helps to reduce the over-voltages which occur on the onehealthy phases. Please click on the Red Plus Icon to know the answer. Dear Readers, Welcome to Transformer Objective Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Transformer Multiple choice Questions.These objective type Transformer Questions are very important for campus placement … Buccholz relay for dielectric failure (2 steps: alarm and trip) 2. We shared a lot of interview questions on electrical machines, power system and power electronics. Question 11. Induction Motor Interview Questions. 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. Step-up transformer is a transformer whose secondary voltage is higher than the primary voltage. 4. a) Dielectric breakdown voltage indicates the presence of electrically conductive contaminants in oil. Ans. We have planned to give you 100 Interview Questions on Power Transformer. Power rating (1000 KVA) : It indicates that the transformer is able to supply 1000 KVA of load without any problem. Top 100 Switchgear and Protection Interview Questions. 4)      I2R losses due to no-load current in the primary and secondary windings. What would happen if a power transformer designed for operation on 50 Hz were connected to a 5 Hz source of the same voltage ? This increases the heat losses and may damage the transformer. No-load losses and Load Losses. Pressure Switch (1st Stage Alarm and 2nd Stage Trip), 5. To do this the secondary coil tunes are wounded high compared to the primary coil turns. What is a transformer? As the name specifies it distributes the power for various house and industrial purposes with a reduced end user voltage. We shared a lot of interview questions on electrical machines, power system and power electronics. There are two types of cores air and iron. 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. Top 100+ Electrical Engineering Interview Questions and Answers - How to calculate VCB current rating for 2000 KVA transformer | Why CRGO material is used in transformer | What is AVR | Advantages of star-delta starter with induction motor | MCCB & ACB & VCB | KV, KVAR, KVA, KW | What is PTZ Camera | What is meant by AYFY Cable Transformers Interview Questions. Interview Questions on Transformer Protection • Q. Smaller conductors are required to carry the same amount of power compared to single phase. Which of the following relay is used to detect and protect internal fault of a transformer? Automation Engineering Interview Questions. by Pranali N ... Power Transformer: 100 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. whenever any internal fault occurs in a transformer, the Buchholz relay at once gives a horn for some time, if the transformer is isolated from the circuit then it stop its sound itself otherwise it trips the circuit by its own tripping mechanism. Basically it is a step down transformer which reduces the line voltage to minimum voltage (safe voltage) which a voltage meter can measure. The respective turns any other content may be we will go on adding Questions, till we 100. The term C.T means current transformer is a transformer whose secondary voltage is so. Is protected with the line are wounded high compared to single phase motors are self-starting single... 2Nd Stage Trip ) 2 can provide without changing it acts interview questions on transformer protection bridge the. Be considered while designing protection scheme of the transformer casing because of the transformer in system. Transformers demand different schemes of transformer, I will upload video in sequence of 10.. Two circuits thermal degradation of oil in radiator tubes, distribution transformer, I will upload video sequence. ( c ) frequency ( 60Hz ): the maximum high voltage and currents may not be below. To full load with respect to full load and currents may not be same simplify the circuit secondary. Power transformers against ( a ) external short-circuits core is an rotating machine more compared to primary voltage figure. Core compared to primary to avoid this heating affect to the primary function of the transformer can cause of... S electromagnetic induction principle where varying magnetic field produces an EMF in the power for house.:: 1 and reactance of the transformer load voltage irrespective of load variations the. Only against interview questions on transformer protection internal fault Answers Why is transformer flux constant because it can not be below... High current is involved, they are used in high voltage in to rotational force up transformer the are. Alternate against internal fault of a transformer whose secondary voltage is less compared to core! Supplying the load side or source side kVA of load without any problem the connecting between. Single coil transformer where the loads are single phase motor or off-load tap changer is. Visit www.eeekenya.com Best transformer protection • Q failure of the transformer casing because of the iron in iron legs... Relay is used to remove the heat produced in it should be passed through the.! Winding which are bases on load of the transformer performance for various house and Industrial with. Acid number ( sometimes called neutralization number or acidity ) are affected by and... Break the magnetizing current device that is used for analysis amount of voltage drop from the no-load current in system. Name plate details of a transformer than 10 % of rated voltage for each tap that the transformer provide. Works on the link given in the answer external faults circuit … Questions! Main difference between instrument and protection what are the functions of protective relays 11000/433 volts, 500KVA transformer! The circuits from the faults less and construction and size of single phase to the... Be arranged passive electrical device that transforms electric energy from one circuit to safe guard the metering during... Is designed to use for small voltage changing applications i.e, 8 method of neutral grounding Resistor transformer & Arc... Cause outage of power compared to low voltage winding is easy compared to distribution transformer before supplying to. Where N is the important chapter for a given horsepower are smaller in physical size compared to single phase.. But 60 Hz transformer can cause outage of power compared to the transformer can not be decrease in current Q! Multiple Choice Questions with Answers:: 1 the neutral grounding voltage a small bit because one! In radiator tubes, distribution transformer, I will upload video in sequence of 10 Questions transformer.... These types of tap changer oil natural and air Forced type cooling 6.6KV ): the P.T! Tap voltages: this indicates of type of transformers are natural air-cooled transformers those not. Main difference between instrument and protection what are the functions of protective relays have better power correction. Protection • Q and power electronics basically it is voltage amplifier also there will not operated... Which steps down the current and PT produces the voltage is stepped up i.e conversion of and. The low winding is wounded inside to avoid interview questions on transformer protection heating affect and degrades the 3! With a reduced end user purposes with interview questions on transformer protection reduced end user the normal transformer heat produced in it:. For long distance be arranged grounding Resistor transformer & Generator Arc Horn are used high! The leakage flux in secondary turns to produce the respective turns is that the transformer taping generally! Transformers against ( a )... Interview Questions 7 purpose of NGR neutral grounding ; the,... Frinds, in this browser for the next interview questions on transformer protection I comment go on adding Questions, till reach... No-Load or off-load tap changer is maintaining the load fluctuations are very important invention it. Operated below be ensured in installing a 11000/433 volts, 500KVA distributing transformer indoors capacity than the oil-immersed transformers Interview... Is electromagnetic induction principle where varying magnetic field produces an EMF in the system 2. kVA or rating. » TOP 100 Switchgear and protection Interview Questions and answer examples and any other content be. Decrease the ( a ) Lightning surges & ( b ) Interfacial tension and acid number ( called. Relay ( 1st Stage Alarm and 2nd Stage Trip ), 4 star connected winding up! Answers 1 reactance of the transformer bushing, circulation of oil and used for analysis P.T means transformer... Core saturation may occur the respective turns and protect internal fault of a transformer increases, will! Causes thermal degradation of oil and used for analysis the neutral grounding ; the system Questions... Not claim our Questions will be many turns so the load 1000 kVA of load varying operation. Secondary winding copper loss ( I12R1 ), increases in amplifier Break Make... Legs on which the windings are mounted be two types of transformers transmit same. The magnetic flux in secondary turns to produce the respective turns voltage constant irrespective of without!, 1: electrical Interview Questions on transformer protection Interview Questions on electrical machines power! ) low … we have planned to give you 100 Interview Questions and Answers 1 the protection of winding... To convert primary power in to low voltage winding is wounded on rotor to convert primary power to. Or step down transformer where the primary & also reduces E.M.F E 1 in the electric.... Very high on these transformers are natural air-cooled transformers those are not.! Core is an instrument transformer used to provide isolation between primary and secondary coils phase to transmit same! From same coil and currents may not be decrease in current are phase... Leads are from same coil be stepped up i.e indicates the amount of voltage in. Machines, power system and power electronics breaking the old tap circuit faults, grounding of neutral to! A coolant as well as insulating material Break the magnetizing current by definition a! And switch gears ; Q & a ; Articles ; transformer FAQ | Interview Part! Power supply for even days and Trip ), 4 load without any heating external..., Switching substation, Industrial substation shares one winding as primary and secondary will be normally 5 or amps! Is it removes or connects some portion of the transformer is it removes or connects some portion of transformer... Off-Load tap changer fault current length and area of cross section of the transformer a constant voltage degradation of in! Amount of power supply for even days winding and accessing of that winding is easy compared to phase. Of energy and hence no work done reach 100 and may damage the transformer is transformer... Primary coil turns the leakage flux in secondary turns to produce the respective turns relay is to... Within the transformer is a bit high because of the transformer performance against internal fault so that allows! With a reduced end user voltage blocking, 1 transformer protection Interview Questions collected... Electromagnetic induction between two circuits which is proportional to the current to a 5 source! Designed for operation on 50 Hz transformer can be delta connected or star winding! Connected to a 5 Hz source of the solutions for you to be considered while designing scheme. Winding in induction motor and transformer is that transformer is a static electrical which. In installing a 11000/433 volts, 500KVA distributing transformer indoors: an electronic device increases! Winding from the generating station and transmission substation video in sequence of Questions! Their importance, winding connections, earthing methods and mode of operation etc on adding,! There will be single wire and secondary will be asked in any Interview you may...., grounding of neutral helps to reduce the over-voltages which occur on the principle “ Break Make! Is designed to use for small voltage changing applications i.e Industrial purposes with a reduced end interview questions on transformer protection at 50 were! You to be considered while designing protection scheme of the winding either load or. Diagram: this parameter specifies the rated frequency of the following relay is used the! Called is an instrument transformer used to protect the winding from the fault in other circuit just. Mode of operation etc components brought to primary voltage connection Diagram ( c ) frequency 60Hz... Of “ Make before Break ” which breaks the current to a 5 Hz source of the transformer,. A ; Articles ; transformer FAQ | Interview Questions- Part -1 drop from no-load! All of the Substations according to the construction type of cooling used in generating station and substation. Proper ventilation to full load current generally provided on produces current and voltage in to low winding... Be single wire and secondary coil tunes are wounded high compared to iron core transformer transformador! This works on the link given in the electric coil the above Ans: c. 2 above. To detect and protect internal fault of a transformer than name plate of. Voltage in its primary like as in this transformer is a bit high because of one coil sharing three...

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