What are the advantages of a three-phase system over a single-phase system?

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What is working of Trip Ckt.Supervision Relay?

1 Answers  

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In iduction motors the current is higher than normal for both the cases when the voltage appllied is more than the rated as well as less than the rated, why?

2 Answers  

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We have one 500KVA transformer. We have tested REF relay and commissioned. After one and half year, due to some ground fault in one of the DB circuit Transformer tripped by REF relay. What will be cause and remedy. Please advise?

1 Answers  

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what is closing resistor in circuit breaker? why it used?

3 Answers  

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1.why ACB is not connected in HT side what Happens? 2.how much voltage maintained in ACB breaker? 3.OLTC is connected in primary side in case secondary side connected what happened?

3 Answers   L&T,

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what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY

0 Answers   L&T,

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What are the classifications of oscillators?

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What is Load sharing of Transformer ?

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How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula? Equate Petrochemical 0 1 how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec. 0 1 What will happened. if we feed 3phase supplay to the stater with out insert the rotor. How much current will flow through the stater winnding? Equate Petrochemical 0 1 What is required of exietation to the alternater. 0 1 why star point of HT motor not earthed? Equate Petrochemical 0 1 Why we are getting low voltage in star connection? Equate Petrochemical 0 2 What's ND relay & it's functions? Equate Petrochemical 0 2 How instantanious short circuit current is calculated? its formula? Equate Petrochemical 0 2 What is servo Motor? What's the advantages of this motor over Induction motor? Equate Petrochemical 0 2 What is core CT & it's function? Equate Petrochemical 0 3 what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY L & T 0 4 What is required of exietation to the alternater. KNB 1 23 what is the design voltage for 6.6KV 2000 KVAR HT capacitor? Consultancy 0 3 Pls explain about vfd control?Where it is used, Give some example? siemens 1 22 Please explain me abt PQ diagaram in the power sector. 0 9

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How to calculate Grid rotor resistance(GRR) losses in slip ring induction motor?

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Why Generator rotate only clock wise ?

8 Answers   L&T,

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