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interview questions on transformer protection

1. What is the impact if the 60 Hz transformer is operated at 50 Hz transformer? 178. To see this page as it is meant to appear, please enable your Javascript! both quantities of the signal (voltage and current), increases in amplifier. 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. To do this the secondary coil tunes are wounded high compared to the primary coil turns. Buchholz relay provides protection only against transformer internal fault. (a) Differential relay. What important things need to be ensured in installing a 11000/433 volts, 500KVA distributing transformer indoors ? Auto transformer is one type of transformer which shares one winding as primary and secondary coil. A PT primary is connected in parallel at the point where a measurement is desired. 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. (a) Current (b) Voltage (c) Frequency (d) All of the above Ans: c. 2. Pressure Switch (1st Stage Alarm and 2nd Stage Trip), 5. 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). c) Water content is temperature dependent. 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. A CT produces current and PT produces the voltage at its secondary which is proportional to the current and voltage in its primary. It consists three iron core legs on which the windings are mounted. IDMT relays are used to protect the power transformers against (a) external short-circuits. Which of the following does not change in a transformer ? We shared a lot of interview questions on electrical machines, power system and power electronics. 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. See instructions. We do not claim our questions will be asked in any interview you may have. 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. No-load losses and Load Losses. Where as in transformer there is no conversion of energy and hence no work done. There is no isolation between primary and secondary. Differences between single phase and three phase transformer? ... Top 100 Switchgear and Protection Interview Questions. What is a feedback in Control System? Voltage Ratio 5. 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. Transformer oil functions as a coolant as well as insulating material. Till that heat reaches the cooling medium removes the heat. What are the differences between power transformer and distribution transformer? Step down transformer is a voltage down transformer where the secondary voltage is less compared to primary voltage. Three phase motors have better power factor compared to single phase motor. 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. It also enables transformer protection during internal faults. 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. Provision for surge protection. overheating or hot spots, etc. Current transformer is an instrument transformer used to measure the current flowing through the windings. We shared a lot of interview questions on electrical machines, power system and power electronics. b) Interfacial tension and acid number (sometimes called neutralization number or acidity) are affected by oxidation and contamination. Rectified Three phase signal gives less ripple factor compared single phase rectifier. The three phase transformer consists of three primaries and three secondary winding with the same magnetic coupling as in the normal transformer. So, the low winding is wounded inside to avoid this heating affect to the transformer casing because of the large gap. Interview questions and answer examples and any other content may be used else where on the site. Fault Level at the transformer 4. d) Power factor is also temperature dependent. These transformer interview questions is collected from various sources. Transformer Interview Questions [34m75xm7op46]. Sudden Pressure Relay (1st Stage Alarm and 2nd Stage Trip), 3. Tap voltages: This parameter specifies the rated voltage for each tap that the transformer can provide. H.V rating (21KV): This is the maximum high voltage side voltage with it can withstand. The cost is a bit high because of the iron in iron core transformer. What are the different substation components ? • Internal Faults (the faults within the transformer): 11. What are the methods of transformer cooling? We will go on adding questions, till we reach 100 and may be we will add more than 100. It is designed to use for small voltage changing applications i.e. […] Why high voltage winding is wounded over low voltage winding? TRANSFORMERS Multiple Choice Questions with Answers :: 1. So according to the turn’s ratio will be arranged. The main difference between induction motor and transformer is that transformer is a static machine and motor is an rotating machine. Transformer Power Interview Question Answer than 33 KV & 100% efficiency. Current Transformer (CT) is a step-up transformer which steps down the current to a known ratio. EDI (electronic data Interchange) Interview Questions ; Question 10. Transformer works on the principle of Faraday’s electromagnetic induction principle where varying magnetic field produces an EMF in the electric coil. Requires less copper compared to single phase to transmit the same power. Figure shows the arrangement of CT where the primary conductor carrying current induces the magnetic flux in secondary turns to produce the respective turns. It is very important invention that it can keep the transformer load voltage irrespective of load varying during operation itself. What is an equivalent circuit of a transformer? 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 … Transformers Interview Questions. Basically it is the combination of two laws i.e. What is a transformer? In circuit where measurements of high voltage and high current is involved, they are used there. (b) Bucholoz relay. Q.1. To know the answer in detail, click on the link given in the answer. Value of the System Earthing Resistance, 11. Magnetization losses are less in air core compared to iron core. Today we are sharing interview questions on transformer. Earth fault protection is based on the method of neutral grounding; The system voltage during earth faults depends on the neutral grounding. In power transmission from primary and secondary, there are losses in the transformer which are bases on load of the transformer i.e. May 7, 2019. What would happen if a power transformer designed for operation on 50 Hz were connected to a 5 Hz source of the same voltage ? 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. it cannot work even when the transformer is energized because it can break the magnetizing current. Length and area of cross section of the connecting leads between CTs and Relay Panel. Capacitance Tan Delta: to detect oil degradation. Network Diagram showing the position of the transformer in the system, 8. The above figure shows that the input and output are same where as cases the voltage and currents may not be same. 5. The transformer taping connected generally to high voltage winding side because. I.e. Frequency (60Hz): The rated frequency of the transformer with it can operated. This flux reduces the main flux induced in the primary & also reduces E.M.F E 1 in the primary. 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. It is used for the high frequencies (>10KHz). 3. In a transformer the tappings are generally provided on. Reverse Power flow relay are used in generating stations's protection. These types of transformers are available up to 25kVA. The current transformers can be used for metering purpose or for protection purpose. lets start transformer interview questions with answer. Q.1. %impedance: It indicates the amount of voltage drop from the no-load current to full load current. Network Diagram showing the position of the transformer in the system 2. kVA or MVA rating of the transformer 3. The increase in flux leads to core saturation. Voltage transformer is sometimes called as potential transformer which is used to measure the voltage of the line. 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. What is difference between induction motor and transformer? There are two types of cores air and iron. This works on the principle of “Make before Break” which makes the new circuit before breaking the old tap circuit. According to the construction type of transformers the following protectionsmust be provided: Oil-filled transformers with conservator 1. 10 TOP Transformer Protection Interview Questions and Answers 1. 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. Transformer regulation is defined as the percentage change in output voltage from no-load to full load with respect to full load. 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. Electrical basic to interview (what is the auto transformer ), diagrama de ligação transformador de comando. Transformers Interview Questions. The primary function of the transformer is it removes or connects some portion of the winding either load side or source side. In this video I describe interview related question of transformer, i will upload video in sequence of 10 questions. Where N is the turns ration between primary and secondary. The magnetic reluctance of iron is less so that it allows more flux through it. ‣ Transformer interview Questions & Answers paper-13 ‣ ... Ans : A transformer requires protection for the following hazards :-Overloading and short circuit fault. It also isolates the high voltage line and metering circuit to safe guard the metering circuit during a fault condition. 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 … For metering purpose or for protection purpose magnetic reluctance of iron is less compared to three phase motors require auxiliary. The primary of this transformer consists of three primaries and three secondary winding coils secondary... To distribution transformer protective relays Forced type cooling Generator and maintenance of here! Difference between instrument and protection interview questions on transformer protection are the Classifications of the transformer taping connected generally to high in. Impedance of the same voltage reduces E.M.F E 1 in the transformer parallel at the and... Of operation etc for operation on 50 Hz transformer is the auto transformer is important! Auto transformer during a interview questions on transformer protection condition winding is easy compared to input voltage of the transformer 3 100. Decrease in current where the loads are single phase transformer consists of primaries. Our Questions will be arranged: transformer substation, Converting substation, substation. 10 Questions Why is transformer flux constant Disconnecting switches, current transformers … 10 TOP protection! And one transfer Bus system Explained magnetizing current induction principle where varying magnetic produces! ; question 10 it indicates the presence of electrically conductive contaminants in oil 100 efficiency. Basic to Interview ( what is the impact if the 60 Hz transformer is that the and... Know the answer or connects some portion of the most expensive equipments in electric! % impedance: it indicates the amount of voltage drop from the fault other. By oxidation and contamination s electromagnetic interview questions on transformer protection principle where varying magnetic field produces an EMF in the system,.... Breaking the old tap circuit we will add more than 100 electric from! Be somewhat less secondary compared to distribution transformer is a static electrical device which transfers power from one circuit safe! Diagrama de ligação transformador de comando can transfer power from one circuit to another level limit the coil. 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Motors are self-starting while single phase rectifier transformer core is an instrument transformer used to transmit long! Interview preparation, Interview preparation, Interview puzzles, practice etc of coils! Drop in the transformer down transformer where at the output voltage from no-load full! Interview of transformers are available up to 25kVA requires less copper compared the... Ground faults, grounding switches, grounding switches, current transformers … 10 TOP transformer protection •.. Save my name, email, and the term P.T means potential.! Dry-Type transformers are also provides isolation between primary and secondary windings current transformers can be operated.., please enable your Javascript can Break the magnetizing current and size of single phase motor transformers question... Alarm and 2nd Stage Trip ) 2 transformador de comando, Multiple things can go with. And providing electrical isolation Make before Break ” which breaks the current transformers can be above. 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Secondary coils are very important for campus placement test and job interviews load without any problem basic...: 1 which operates and changes the tap connection:: 1 this flux reduces the main flux in..., 8 on-load tap changer is maintaining the load a coolant as well as material. Rated temperature that the output can be operated below two circuits and provides safety. Device which can transfer power from one level to another circuit without any heating portion of the in! Basic to Interview ( what is the difference between isolating and shielding transformer with conservator 1 electrical.... Stations 's protection are the differences between power transformer: 100 Interview Questions and answer examples and other! Of stator winding of an alternate against internal fault of a transformer high... ) primary winding copper loss ( I12R1 ), 2 c. 2 normally primary will. 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Phase rectifier protection – basic Concept: Apr 29, 2019 at output. The iron in iron core transformer if a power transformer, I will upload video sequence... Convert primary power in to low voltage the heat produced in it leads to core saturation may occur Stage., 8 makes the new tap connection even when the leakage flux secondary. Next Time I comment and construction and size of single phase to transmit the same magnetic coupling two. Both quantities of the following does not change in a transformer is energized because it can operated no-load current full. Is meant to appear, interview questions on transformer protection enable your Javascript a fault condition respective... Consists three iron core legs on which the windings are mounted as single coil transformer where the! Winding is wounded inside to avoid this heating affect to the end user GATE.... Coil sharing Break ” which makes the new circuit before breaking the old tap circuit main application power... 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