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.

2008

why they were using TRIAC instead relay in some controllers and what is the advantages.

2067

write encoder 17 pins details? pin a;b+, pin b;w+,..pin s & t. what is the meaning of b+, w+? explain;

2207

how to calculate magnetic force genrated by a coil ?

2261

why +24 v and -48 v give to BTS? If -48v protect from surge then why we not use -24 v?

1902

what will be the min and max voltage flow from neutral to earth?

1599

how can i reduce sparking without stepdowning the voltage

2572

Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example?

2284

which is the best institute for PLC,SCADA,DCS in hyderabad

2426

What is the armature mmf in a D.C machine?

1292

If we are given a 10 amp cable type and asked to calculate the number of cores used and the thickness of the cable, how do we do it?? please help...urgent!! i hope the question is clear enough!!

1887

reason of diode failure in alternator

1925

How can we calculate ac current from the given DC current when AC voltage is given?

2017

i want to know d working mechanism of tafe tractors next i like to know d engine type of apache bighs can anyone help me

2298

How will you justify IR value and Charging voltage of any motor,transformer and Cables.......???? . . . . . . . . Plz tell me any body Baljeet Singh, engineer_89@refiff.com

2171