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hi dear all, we had a blast in a 3.3kV air breaker contactor connected to motor of same ratings, the flash blast occured the moment we tried to close the switch, after a period of long time. But first, we opeated the above mentioned contactor, by giving it 3.3kV supply on NO LOAD and it...

Which tools are better??? or in other way, what is the difference between Stainless Steel tools and Chromium Vanadium Tools?? Please explain in details.

Hi dear all, I am conforted with a situation, I am provided with following switch gear which is about 50 years old, now I have to start them. We refubrished the switchgears, but when we started two motors of 3.3kV, arc flash occured in both separate relevant switchgears of motors, I showed the...

Hi dear all, I am talking about Circuits for 3 phase induction AC motor. What we usually have is a Crcuit Breaker, magnetic Contactor and thermal over load. My question is that if I use Crcuit Breaker which has thermal over load tripping and immediate short circuit tripping capabilites then...

Dear All, I am an electrical engineer, and I am confort with the challenge of planning and scheduling maintenace activities of newly installed HVAC system, whose system specifications are as follow, kindly help me in giving your valuable feedback that maintenance activites I have to perform on...

According to my inforamtion and knowledge, there is no issue whether you use MCC or Switchgear, but normally the MCCs contains Isolators (Switches) not Circuit breakers and over load relays with magnetic contactors. Which is usually preferred in motors case not in transformers casse, In...

try adding harmonic filters, hope they resolve the issues...

if as I assume, all reading taken with correct measurement procedure and apparatus, can we say corrosion of winding wires is occuring so that the resistance is increased over all and more corrosion or oxidation between phase b and c??? what are the possibilities of it???

Hi all, I am an electrical engineer, working in an oil refinery, here the HVAC system comes under the authority of Electrical Department solely including total operation and maintenance, Last week I met another Engineer from a very reputed Fertilizer plant and he also told me that at his plant...