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Dear Davva, Skogsgurra is right, surge arrester use for vacuum contactor and if you have SF6 it is not there, the best position of Surge arrester at the load side at the motor or transformer, however the motor junction box space not enough to put it then they put it at the switchgear, the...

We have light fixture 2X 36 watt, 240 Volt florescent lamps with ballast, and we found MCB always tripped due to damage of the ballast and wiring inside light fixture, then we measured the temperature at light fixture during normal operation we found it reached to 100 C because it is between two...

We have a welding Machine Rated input Voltage 400 Volt (single Phase), 32.2 KVA, 81 A , but we have not 400 Volt single phase, then Electrical Technician connected it as two phase 415 volt, they used this machine for long time at work shop to weld workpieces on Metal table without ground "...

Suggestion: Visit www.rotork.com Thanks

What is your mechanical load (power, speed, ..) What is type of DC Motor, separately excited, shunt or series? It depend on your mechanical load (Power and speed), then you can select Ac Motor suitable for your mechanical load · If your load needs constant speed regardless variation of load...

Jbartos, Thanks for your comment, It is useful for synchronous Machine Please if anybody has an idea about application (in Industry) of Induction generator, just send it Thanks

FARHADS Thanks for your interest but I'm not from Iran

zig-zag flux in Induction machine is a harmonic flux as obtained from a finite element analysis due to Inverter-fed operation , more details available in site http://www.ekc.kth.se/eme/eme_eng.html http://www.ekc.kth.se/eme/fem_desc1.html

Thanks for all comments, Can anyone give me Internent sites (more details about Induction Generators) Regards,

Hi Gentlemen, electricpete, Thanks for your reply, I know about power meter or use reverse power protection and use it as alarm but my question about AC current meter Is any analog or digital AC current meter, indicate negative or positive indication like DC current meter or not Regards...

We have 3.3kV, 265 KW, 1484 RPM induction motor coupled with steam turbine, when speed increase more than synch. Speed (Is Motor will change to Induction generator to inject reactive power to 3.3kV Busbar), what is status if speed become between 1484 to 1500 RPM, How can know this current feed...