last week we did the REF relay test by closing single pole (R phase) of CB and apply 380V at the primary of delta transformer. we get 33A at the primary of the R phase star end. but we get 380A at both R an B in delta side. how and why?
1 3693We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?
5 11808What is the function of restraining coil in differential relay? as well as restraining current?
8 46671WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE
2090what is back trip and re-trip in protection schemes? why these two? define me the exact function of these two?
1 7583What should be the length of transmission line so that we can see/obtain the full sine wave of voltage??
1904what is the purpose of the armored for the power Or control cable? How to select the type of the armored?
1 4381Post New Siemens Interview Questions
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In VVVF DRIVES VOLTAGE IS ALSO VARY WITH THE FREQUENCY. HOW? WHAT IS THE DIRECT FORMULA RELATING THESE TWO.
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Respective sir I'm bcom 1st sem student. I have very interest in banking sector. I finished my pu with 88% how I can prepare for banking exam (especially po)yet I have no any practice but I hope if I get good guidance I can pass my banking exam so kindly inform me how I can prepare for po exams. My email address is- 98anjuma@gmail.com. I'm really counting second when I will get ans by u. Thank you sir
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