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 3012We 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 10273What is the function of restraining coil in differential relay? as well as restraining current?
8 43481WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE
1576what is back trip and re-trip in protection schemes? why these two? define me the exact function of these two?
1 6180What should be the length of transmission line so that we can see/obtain the full sine wave of voltage??
1408what is the purpose of the armored for the power Or control cable? How to select the type of the armored?
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