Answer / jakeer

Various reasons for motor getting over heated.
1.Due to faulty bearings.
2.Due to low voltages.
3.Due to load fluctation from the drive end.
4.Due to mis assembly of motor.
5.Due to rotor fotness problem.

explain 100 percent and 95 percent earth faults

1 Answers  

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HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

0 Answers  

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with out colour codeing on conductor how can be find what is r,what is b,what is y phases.....

0 Answers   Divis Laboratories,

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How to write a progrramme to turn ON and turn OFF a motor with a single push button in AB?

2 Answers   HCL, Torrent Pharma,

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What is bandpass of a transformer?

2 Answers  

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How to calculate the Harmonics losses in terms of cost/unit.

0 Answers  

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during positive and negative half cycle of ac supply what happenes in the load?

1 Answers   Siemens, Wipro,

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Are we do it in single transformer with dual primary as 11 KV and 33 KV and constant output as 415 Volts?.

1 Answers  

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how to differentiate a mpcb,mcb with a contactor? Explain their working operation

0 Answers   L&T,

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for 5KW resistive load can anyone please suggest me whether to go for UPS/Inverter or Generator depending upon cost calulations

0 Answers  

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what happen to the voltage and current in all phases when an earth fault occur in a phase in three phase three wire system(delta connected)...

1 Answers  

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what will happen if the connections of protection ct reverse? will it burn the ct?

2 Answers  

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