In an ACB shunt trip coil and undervoltage coil operated normally( breaker open and charged). But closing coil not operating untill manually discharge and recharging. Any help.

0 Answers   PPIL,

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we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.

0 Answers   MTN,

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why neutral wire don't shock?

9 Answers  

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Send me Model Question paper for the post Scientific Assistant in NPCIL

0 Answers  

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how much speed will trawiling current

3 Answers   TCS,

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why ohms law does not obey semi-conducters?

2 Answers  

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in what type of applications v can use q meter?

0 Answers  

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we all know that in transformer, voltage and current are inversely related i.e. Vp/Vs= Is/Ip....so in standard CT..we have a ratio of 200/5...that means our voltage should increase by ratio of 40..althoug that is not the case...because that requires high insulation level.and pratically not feasible......can anybody clarify my ques.......thanx

2 Answers  

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How to decide whether A / B / C / D curve type MCB should be used?

0 Answers  

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how much flux density of CRNO core

0 Answers  

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what things to be considered when designing UPS

0 Answers   Aplab, Veta Kipawa ICT Center,

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resistance switching is used in case of- ? a. air blast CB b. bulk oil CB c. minimum oil CB d. all types of CB

4 Answers   HCL, SSC,

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