Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

0 Answers   Pride Hotels,

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in cable joints procedure what electrical problems have been solved out ?

1 Answers  

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Why is better to have a minimum ceiling voltage of 250% than 160%?

0 Answers  

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i am going to give the JSEB,RANCHI exam for power plant,so i need some samples of papers related to that,so please send me these papers by my mail id.

0 Answers  

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Which do you think is the most significant cause of energy loss in a factory?

0 Answers  

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aeroline vibration is present

1 Answers   DVC,

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How we can calc. the Backup time of a battery Bank???

6 Answers   Emerson,

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My switchgear busbar is rated at 2000A and just imagine the actual load on busbar is 1000A. From that busbar there are 10 outgoing feeders. Now the question is will the load be 1000A on each outgoing feeder or 100A per outgoing feeder. 2nd thing how do i calculate the load on individual feeder. Thanks for your time. Please provide some clarification on this issue.

1 Answers   Alstom,

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send me the upsc conventional papers of 2006

1 Answers   Juniper Networks, Siemens,

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What is mean by CT Saturate? how do we calculate?

5 Answers   ABC,

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why voltage drop will occurs in 3 phase line?

12 Answers   ABB, Servo,

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RESPECCTED SIR/MADAM- I AM PRERING FOR SECTION ENGINEER (ELECTRICAL) RRB CHANDIGARH PLEASE SEND ME SOME PREVIOUS YEAR QUESTION PAPER OR MODEL PAPER.MY EXAM IS ON (30- NOVEMBER 2008).I AM VERY THANKFUL TO YOU. FROM- HARENDRA SINGH YADAV

0 Answers  

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