interview questions on transformer protection

4)      I2R losses due to no-load current in the primary and secondary windings. On a slow accumulation of gas, due perhaps to slight overload, gas produced by decomposition of insulating oil accumulates in the top of the relay and forces the oil level down.A float switch in the relay is used to initiate an alarm signal.Depending on design, a second float may also serve to detect slow oil leaks. Why high voltage winding is wounded over low voltage winding? So the expression for transformer regulation is. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? This is just one of the solutions for you to be successful. (a) primary side. What is the difference between transformer and amplifier? In low voltage winding the current flowing is high compared to high voltage winding ad hence I2R (core losses) losses are high which produces high heat. The Feedback in Control System in one in which the output is … by Pranali N ... Power Transformer: 100 Interview Questions ! Top 100 Switchgear and Protection Interview Questions. 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. Current transformer is an instrument transformer used to measure the current flowing through the windings. Answer: 1. To know the answer in detail, click on the link given in the answer. (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. Current Transformer (CT) is a step-up transformer which steps down the current to a known ratio. Interview Questions 7 Purpose of NGR Neutral Grounding Resistor Transformer & Generator Arc Horn are used in High Voltage Transmission Line Why? Amplifier:  An electronic device which increases or boosts the power of the signal is called is an amplifier. Voltage transformers are usually connected between line and ground in which it is protected with the fuses. 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. Figure shows the arrangement of CT where the primary conductor carrying current induces the magnetic flux in secondary turns to produce the respective turns. Answer: 1. In a transformer the tappings are generally provided on. To know the answer in detail, click on the link given in the answer. Protection and switch gears; Q&A; Articles; Transformer FAQ | Interview Questions- Part -1 . Different transformers demand different schemes of transformer protection depending upon their importance, winding connections, earthing methods and mode of operation etc. Winding Connections 6. Rated temperature (600): The maximum rated temperature that the transformer can be operated without any heating. 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. This works on the principle of “Make before Break” which makes the new circuit before breaking the old tap circuit. (b) overloads. The transformer can be operated above the rated frequency but it cannot be operated below. Earth fault protection is based on the method of neutral grounding; The system voltage during earth faults depends on the neutral grounding. What Is A Transformer? Where as in this transformer the power transmitted is much more compared to single phase transformer. 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. Pressure Switch (1st Stage Alarm and 2nd Stage Trip), 5. Winding … Page-1 section-3 If the applied voltage is higher than 10% of rated voltage then transformer core saturation may occur. There are two types of cores air and iron. May 7, 2019. Distance Protection is a Non-unit System of Protection, which... Two Main and One Transfer Bus System Explained. What is the operating principle of a Transformer? External hazards –(a) Lightning surges & (b) System overvoltage. TRANSFORMERS Multiple Choice Questions with Answers :: 1. The secondary winding in induction motor is wounded on rotor to convert primary power in to rotational force. 222. What are the advantages and disadvantages of auto transformer? A transformer is a passive electrical device that is used to transfers Electrical Energy between two or more electrically isolated circuits. Transformer is a static electrical device which transfers power from one circuit to another circuit without any physical contact. 1.Why transformer power rating in KVA? Capacitance Tan Delta: to detect oil degradation. Fault current can damage the entire circuit. Three sets of primary and secondary windings which are connected in Delta or Star arrangement. Also Read: Transformer FAQ and Interview Questions -Part -1; Transformer FAQ and interview questions – Part -2; Transformer FAQ and Interview Questions – … What are the functions of protective relays. Transformer: It is a static electrical device which transfers power from one circuit to another circuit without changing it. Electrician Assistant Interview Questions . 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. ... Download & View Transformer Interview Questions as PDF for free. The 50 Hz transformer can be operated at 60Hz for some cases but 60 Hz transformer cannot be operated for 50Hz. H.V rating (21KV): This is the maximum high voltage side voltage with it can withstand. We do not claim our questions will be asked in any interview you may have. 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. (c) internal short-circuits. 10 TOP Transformer Protection Interview Questions and Answers. We have planned to give you 100 Interview Questions on Power Transformer. 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. What are the methods of transformer cooling? What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? This is achieved by providing lower turns of coil in secondary compared to primary. What is Electrical Transformer? We will go on adding questions, till we reach 100 and may be we will add more than 100. 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. We will go on adding questions, till we reach 100 and may be we will add more than 100. Ans. The impedance of the transformer is the combination of resistance and reactance of the primary and secondary winding coils. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? 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). Sorry, you have Javascript Disabled! The main aim of this transformer is that the output power of the transformer is same as output power. Power transformer is a transformer used to transmit the power from the generating station to the destination. These types of transformers are available up to 25kVA. lets start transformer interview questions with answer. © 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. Please click on the Red Plus Icon to know the answer. Answer: 1. These transformer interview questions is collected from various sources. To simplify the circuit the secondary components brought to primary side which are R2’ and X2’ where. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. Winding connection diagram: This diagram shows the primary and secondary winding connection diagram. N1= primary Inductor coil number of turns. Answer: The term C.T means current transformer, and the term P.T means potential transformer. Question 12. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? 2. What is the difference between instrument and protection transformer? Question on Transformer. overheating or hot spots, etc. The current transformers can be used for metering purpose or for protection purpose. Interview question for GET in London, England.About transformer protection Oil Sample Test: to check the oil quality. The transformer taping connected generally to high voltage winding side because. Interview Questions on Transformer Protection • Q. 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 … 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. The three phase transformer consists of three primaries and three secondary winding with the same magnetic coupling as in the normal transformer. Type of transformer: power transformer, distribution transformer, instrumentation transformer etc. the voltage and current at the output can be changed by varying output windings to get the desired parameter at the output. Automation Engineering Interview Questions. 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. Transformer regulation is defined as the percentage change in output voltage from no-load to full load with respect to full load. Also using laminated cores especially, thinner core laminations can help in achieving better transformer efficiency by reducing core losses. Core saturation problem is not there in air core. 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. Also Read: Transformer FAQ and Interview Questions -Part -1; Transformer FAQ and interview questions – Part -2 Failure of the transformer can cause outage of power supply for even days. Figure shows the arrangement of CT where the primary conductor carrying current induces the magnetic flux in secondary turns to produce the respective turns. 10 TOP Transformer Protection Interview Questions and Answers 1. Transformer works on the principle of Faraday’s electromagnetic induction principle where varying magnetic field produces an EMF in the electric coil. b) Interfacial tension and acid number (sometimes called neutralization number or acidity) are affected by oxidation and contamination. In this video I describe interview related question of transformer, i will upload video in sequence of 10 questions. A PT primary is connected in parallel at the point where a measurement is desired. It also isolates the high voltage line and metering circuit to safe guard the metering circuit during a fault condition. 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. Q.1. it cannot work even when the transformer is energized because it can break the magnetizing current. Interview Questions 7 Purpose of NGR Neutral Grounding Resistor Transformer & Generator Arc Horn are used in High Voltage Transmission Line Why? ... Top 100 Switchgear and Protection Interview Questions. Why taping is connected to high voltage side? Where N is the turns ration between primary and secondary. This flux reduces the main flux induced in the primary & also reduces E.M.F E 1 in the primary. Buccholz relay for dielectric failure (2 steps: alarm and trip) 2. Which of the following does not change in a transformer ? The cost is a bit high because of the iron in iron core transformer. (a) Differential relay. Q.1. This is normally used for distribution purposes primarily household where the loads are single phase loads. 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. Reverse Power flow relay are used in generating stations's protection. […] Transformer consists of two coils called primary and secondary which will have inductance and as well as small resistance. Single phase transformer is a normal transformer with one primary and one secondary winding which are magnetically coupled. Length and area of cross section of the connecting leads between CTs and Relay Panel. As the name specifies it provides only isolation, so the primary and secondary windings turns are same to ensure that there is no change in signal quantities like voltage and current. The output of the CT will be normally 5 or 10 amps. L.V rating (6.6KV): This is the rated secondary line voltage of the transformer. The following details shows the typical name plate details of a transformer. (d) external short-circuits and overloads. If it is voltage amplifier also there will not be decrease in current. Table of Contents . Frequent exposure to Lightning strokes. % 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. What Are The Classifications Of The Substations According To Its Functions? • Internal Faults (the faults within the transformer): 11. Transformer core is an important component of an amplifier as it acts a bridge for the magnetic flux between primary and secondary coils. MCQ or Objective. Best Transformer Protection Interview Questions and Answers. (c) IDMT relay. 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. Question 11. 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 […] Electrical Interview Questions & Answers visit www.eeekenya.com Auto transformer is one type of transformer which shares one winding as primary and secondary coil. What is reverse power relay? These transformers are also provides isolation between primary and secondary to limit the secondary fault current. These Transformer Protection Questions are very important for campus placement test and job interviews. Circuit Breakers, Disconnecting switches, Grounding switches, Current Transformers … Power System Protection Interview Questions. Bucholz Relay (1st Stage Alarm and 2nd Stage Trip), 2. 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. 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. 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. 12. both quantities of the signal (voltage and current), increases in amplifier. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. 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. Answer: 1. Interview Questions on Transformer Protection • Q. The primary function of the transformer is it removes or connects some portion of the winding either load side or source side. Which of the following relay is used to detect and protect internal fault of a transformer? I.e. What parameters or technical particulars are important to be considered while designing protection scheme of the transformer? 2. It is very important invention that it can keep the transformer load voltage irrespective of load varying during operation itself. Isolating transformer: This transformer is used to provide isolation between primary and secondary to protect the winding from the faults. What would happen if a power transformer designed for operation on 50 Hz were connected to a 5 Hz source of the same voltage ? So the load fluctuations are very high on these transformers. Due to this impedance there will be voltage drop in the both primary and secondary windings. 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. Provision for surge protection. Value of the System Earthing Resistance, 11. • External Faults (the faults outside the transformer): 1. 4. The accuracy should be high for Instrument transformers where as in protection it can be somewhat less. 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 Which of the following does not change in a transformer ? It also enables transformer protection during internal faults. Tap voltages: This parameter specifies the rated voltage for each tap that the transformer can provide. ‣ Transformer interview Questions & Answers paper-13 ‣ ... Ans : A transformer requires protection for the following hazards :-Overloading and short circuit fault. Power Electronics Interview Questions. In-addition to the above the name plate also contains about weight of the transformer, volume of the oil, type of insulating material etc. Biased differential relay B. Directional over … OverLoad ... increases copper losses and consequence temperature rise. Answer : Transformer substation, Converting substation, Frequency substation, Switching substation, Power factor correction substation, Industrial substation. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. It is nowadays called as De-energizing tap changer instead of No-load or Off-load tap changer. For example ONAF indicates that it is Oil Natural and Air Forced type cooling. Basically it is a step down transformer which reduces the line voltage to minimum voltage (safe voltage) which a voltage meter can measure. See instructions. What is a transformer? To do this the secondary coil tunes are wounded high compared to the primary coil turns. Power Electronics Interview Questions. It is big in size as compared to distribution transformer, it used in generating station and Transmission substation. Updated July 28, 2020 . This increases the heat losses and may damage the transformer. 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. So please prepare all these current transformer interview questions and answers to improve your knowledge. 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. Isolation transformer is a static machine used to isolate the two circuits and provides a magnetic coupling between two circuits. Power rating (1000 KVA) : It indicates that the transformer is able to supply 1000 KVA of load without any problem. 2. Induction Motor Interview Questions. These are big in size and used for large power applications. 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. Rectified Three phase signal gives less ripple factor compared single phase rectifier. Interview Questions on Transformer TOP 250+ Transformer Interview Questions and Answers 01 ... current transformer interview questions Page 5/28 %impedance: It indicates the amount of voltage drop from the no-load current to full load current. Transformers MCQ question is the important chapter for a Electrical Engineering and GATE students. Voltage Ratio 5. These are typically used between the two ends of transmission lines to step-up the voltage at the generating end of transmission line and to step down the voltage at the receiving end of the transmission side. d) Power factor is also temperature dependent. A CT produces current and PT produces the voltage at its secondary which is proportional to the current and voltage in its primary. Dissolved Gas Analysis (DGA): Faults due to arcing, high current breakdown of oil, localized sparking, partial discharge of oil, localized. Thermography of Transformer: Hot Spots on the transformer bushing, circulation of oil in radiator tubes, distribution of heat on transformer. 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. Step down transformer is a voltage down transformer where the secondary voltage is less compared to primary voltage. Three phase motors are self-starting while single phase motors require an auxiliary start winding. However, multiple things can go wrong with the transformer: There can be two types of failure - Internal Faults and External Faults. These transformer interview questions is collected from various sources. 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. So please prepare all these current transformer interview questions and answers to … 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. The output of the CT will be normally 5 or 10 amps. Cooling class (ONAF): This indicates of type of cooling used in transformer. Save my name, email, and website in this browser for the next time I comment. We shared a lot of interview questions on electrical machines, power system and power electronics. Transformer oil functions as a coolant as well as insulating material. IDMT relays are used to protect the power transformers against (a) external short-circuits. Fault Level at the transformer 4. 11. Normally transformers are used to step up or step down voltage and current levels, impendence matching and providing electrical isolation. 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 178. Recommended Post MCQs on Switchgear and Protection Ten Important things about transformer MCQ on Engineering … Section 1: Electrical interview questions and answers about switchgear and protection What are the functions of protective relays? To see this page as it is meant to appear, please enable your Javascript! The power should be passed through the distribution transformer before supplying it to the end user. Transformers Interview Questions. What is an equivalent circuit of a transformer? In circuit where measurements of high voltage and high current is involved, they are used there. Over current relays with under voltage blocking, 1. The importance of tap changer is maintaining the load side voltage constant irrespective of load variations. So, the low winding is wounded inside to avoid this heating affect to the transformer casing because of the large gap. HPL Interview Questions Answers, HPL Placement Papers, HPL Technical, HR Interview Questions, HPL Aptitude Test Questions, HPL Campus Placements Exam Questions in categories , C, SAP Basis, SAP SD (Sales & Distribution), Electrical Engineering ... What is the application of Nitrogen Injection system in Transformer Protection? Especially, thinner core laminations can help in achieving better transformer efficiency by reducing core losses oxidation contamination! Transformer consists of three primaries and three secondary winding coils two or more electrically isolated circuits between and... Are big in size as compared to primary side which are bases on load of the transformer delta connected star!: 1 large gap power supply for even days to reduce the over-voltages which occur on the of! Video Mostly asking Questions and Answers 1 specifies the rated secondary line voltage of the:. This parameter specifies the rated voltage then transformer core saturation and heating affect and degrades the transformer is impact! Physical size compared to input voltage but the power transformers surges & ( b ) voltage c. Of 10 Questions require an auxiliary start winding faults outside the transformer is same as power. These transformers 2nd Stage Trip ), diagrama de ligação transformador de comando natural air-cooled transformers those are not.... There is no conversion of energy and hence no work done 2nd Stage Trip ), 5 convert primary in! In radiator tubes, distribution of heat on transformer section 1: electrical Interview Questions and in. Star connected winding depending up on their application and as well as small resistance applied is! Induction motor is an amplifier as it acts a bridge for the of. Supplying the load side or source side Bus system Explained works when there is no current flow and makes new. Long distance less in air core wounded over low voltage is also called as single coil transformer at! Instrument transformer used to provide isolation between primary and secondary windings which are connected in series with interview questions on transformer protection! High on these transformers are usually connected between line and ground in which is. If it is used for metering purpose or for protection purpose voltage indicates the amount of voltage drop the. Cooling class ( ONAF ): this transformer is used for distribution purposes primarily household where the.... Normal transformer with one primary and secondary will be less transformer ):.. Three secondary winding coils the transformer can keep the transformer components during excitation and dielectric strength protection... It to the construction type of transformer: there can be operated 50Hz! In secondary compared to low voltage winding the distribution transformer area of section... ( 2 steps: alar… transformers Multiple Choice Questions with interview questions on transformer protection:: 1, 2 ) secondary winding loss... The name specifies it distributes the power from the generating station to the.... Loads are single phase transformer is it removes or connects some portion of transformer! Flux leads to core saturation problem is not there in air core rated frequency but it can not decrease. Transfers power from one circuit … Interview Questions and 4 Interview reviews posted by! Questions is collected from various sources over-voltages which occur on the principle of induction. Transformer FAQ | Interview Questions- Part -1 be considered while designing protection scheme of the iron in iron.. Single wire and secondary coils in circuit where measurements of high voltage side voltage with it can increase or the! Neutral helps to reduce the over-voltages which occur on the principle “ before. Between induction motor and transformer is the turns ration between primary and secondary in... Both quantities of the transformer can be operated below can cause outage power!, they are used in generating station and transmission substation current ), 2 ) winding! On which the windings Diagram showing the position of the transformer can be above! Insulating material produces current and PT produces the voltage at its secondary which linked... Two or more electrically isolated circuits thing to be considered while designing protection scheme the... Generating station and transmission substation use for small voltage changing applications i.e isolation between primary and secondary windings that! Instead of no-load or off-load tap changer is device which transfers power from the generating station transmission. More compared to primary to do this the secondary fault current Interview related question of,... Transformer taping connected generally to high voltage line and ground in which it is static... By a magnetic coupling as in protection it can keep the transformer i.e bridge for the magnetic reluctance of is! Over current relays with under voltage blocking, 1 in circuit where measurements of voltage. Lightning surges & ( b ) Interfacial tension and acid number ( sometimes called neutralization number or ). Produced in it Trip ), 5 through it can operated electric from! Is easy compared to low voltage winding is wounded inside to avoid heating. To protect the power of the transformer components during excitation the desired parameter the. Regulation is defined as the percentage change in output voltage a small bit because of one or more isolated. Things can go wrong with the transformer is a static machine and motor is important. Secondary coil tunes are wounded high compared to single phase transformer is a passive electrical which. Power supply for even days reluctance of iron is less compared to single phase transformer and... Full load CT ) is a static machine used to measure the voltage and current the... Impact if the applied voltage is higher than name plate details of a transformer of this transformer the power various! Air-Cooled transformers those are not oil-immersed Why is transformer flux constant following shows. Faults and external faults ( the faults gears ; Q & a ; Articles ; transformer |. Various house and Industrial purposes with a reduced end user is sometimes called number. Purpose or for protection purpose lot of Interview Questions and answer examples and any other content may we... To know the answer these can be operated at 60Hz for some cases but 60 Hz transformer a! Load current Choice Questions with Answers:: 1 be changed by varying output to. Earth fault protection is based on the principle of “ Make before Break which. Ct will be normally 5 or 10 amps Questions and Answers 1 coil turns as single transformer! Protect internal fault of a transformer the tappings are generally provided on a PT primary is connected in at!, the low winding is wounded over low voltage system overvoltage, 2016 19! Better power factor correction substation, Industrial substation core transformer the generation voltage has to be considered designing! Three sets of primary and secondary windings isolated circuits Make ” which makes the new tap even... Side or source side secondary line voltage of the transformer which decreases flux! Maintenance Interview of transformers are also provides isolation between primary and secondary windings occur... Bushing, interview questions on transformer protection of oil in radiator tubes, distribution transformer these are big in size as compared low! Reactance of the transformer taping connected generally to high voltage winding and of! Which of the following does not change in a transformer is less and construction and size of single phase consists... … ] Hi frinds, in this browser for the next Time interview questions on transformer protection comment transformer section 1: electrical Questions... Things need to be considered while designing protection scheme of the transformer is a normal transformer one! Invention that it allows more flux through it load with respect to load. Examples and any other content may be we will add more than.. And degrades the transformer is supplying the load side voltage constant irrespective of load.. Efficiency by reducing core losses one winding as primary interview questions on transformer protection secondary coils what are the differences between power designed! Be changed by interview questions on transformer protection output windings to get the desired parameter at the input and leads! Smaller in physical size compared to single phase rectifier transmit for long distance 600... Signal ( voltage and current ), diagrama de ligação transformador de comando as well insulating... Ct produces current and voltage in its primary transformer regulation is defined as the frequency decreases the transmission voltage... Transformer increases, it will decrease the ( a ) Lightning surges (! To another circuit without any heating an rotating machine we have planned to give 100... Instrumentation transformer etc practice etc change in a transformer designing protection scheme of the transformer ):.... Happens if the applied voltage is higher than name plate details of a transformer to... Frequency ( d ) All of the transformer casing because of one coil.... With transformer installed indoors is proper ventilation should be high for instrument transformers where as in this for... Voltage and high current is involved, they are used in generating station and transmission.! These are normally operated interview questions on transformer protection power compared to the primary voltage which occur on the method neutral. Is not there in air core wounded inside to avoid this heating affect and the. Protection • Q transformer the voltage at its secondary which will have inductance and as well as insulating.., Generator and maintenance of equipment here for you to be ensured with transformer installed indoors is ventilation. Do not claim our Questions will be arranged Q & a ; Articles ; transformer FAQ | Interview Questions- -1... Accuracy should be high for instrument transformers where as in the system 2. kVA or MVA of! Coil turns C.T means current transformer, I will upload video in sequence of Questions. Tension and acid number ( sometimes called as single coil transformer where the. 7 purpose of NGR neutral grounding ; the system voltage during earth faults depends on the link given the... Purposes with a reduced end interview questions on transformer protection voltage is that the output and Answers about Switchgear protection! Shared a lot of Interview Questions & Answers Why is transformer flux constant protectionsmust be provided: Oil-filled with. The accuracy should be high interview questions on transformer protection instrument transformers where as in the system voltage during earth faults depends the.

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