Am using an electronic digital display to see the RPM of ABB ACS 550 drive, which is showing negative value when the motor & drive in stop mode but it is showing correct value during the run mode. can anyone help me out??

2 Answers   Bala Power Solutions,

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tan delta equation test on alternators

0 Answers  

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Draw the DOL starter and star delta starter drawing?

0 Answers   Danfoss,

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What is the type of earth fault protection used in battery? explain.

0 Answers   PSEB,

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what will happen if there is a voltage leakage or current leakage in an electrical train

0 Answers  

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how many types are their in switchyard or substation(like D,I TYPE), what is differant between them

0 Answers  

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motor and transformer working with same principle so why motor rotor was roted and transformer not roted

9 Answers   ABB, Suzlon,

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what is the circutor?why we use it ?

0 Answers  

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I am completed DEEE in tamilnadu, now i am working in andhrapradesh with 2.5 year experience in relavent field. capacity of the tranformer is 11KV, 1MVA Transformer, i am eligible for getting c licence in andhrapradesh pl help me.

0 Answers  

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the input mechanical power of a single alternator is increased,its RPM increased but in case of an alternator synchronised with grid its RPM does not increased with increase of input mechanical power. why?

3 Answers   Bhel,

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how to improve power factor correction?

3 Answers  

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If one tertiary phase i.e. R,Y or B is earthed of a loaded type tertiary delta connected (Without load)of a power auto transformer, what is its advantage/disadvantage?

0 Answers   Amara Raja,

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