Motor Current

I have a motor connected to a pump for low pressure hot water (62 dec c) on the data plate the motor says 400V 50Hz 1450 rpm 7.5Kw 0.82cos 15.20 amps delta connection. But when I connect my clamp on amp meter the current drawn is 18 amps why is this when the motor is rated at 15.20 amps is this rating not true power??

Thanks for any help


Paul Kav
Honeywell Controls

Motor Current?

I have a motor connected to a pump for low pressure hot water (62 dec c) on the data plate the motor says 400V 50Hz 1450 rpm 7.5Kw 0.82cos 15.20 amps delta connection. But when I connect my clamp on amp meter the current drawn is 18 amps why is this when the motor is rated at 15.20 amps is this rating not true power??

Thanks for any help


Paul Kav
Honeywell Controls

Testing of 250KVAR

I have 10 sub stations 6.6kV with 250 kVAR powerfactor correction sets with boddingtons control. The sets have been installed fot 12 months and need testing. Is the Fluke 179 capactitor tester able to test the set and how would you go about it the caps are in delta connection. Any help would be gratefull


Regards

Paul

inverters

if you fit inverters to an existing installtion what happens to the power factor correction sets that are installed do any filters have to be fitted and if so why?


Thanks

Paul

3 phase 18kw motor starter

I have a motor starter with four contactors main, star, delta, resistor. The resistor is phases up the same as the delta connections. On start up the main and star contactors goes in and the motor starts after the timer times out the resistor contactor goes in with the star then the next timer times out and both star and resistor contactors drop out and the delta starts. what is the resistor for and should it be going in with the star connection or should it go in before delta.
is it possible this is a waucope type continupus tourque star delta starter
Thanks for any help


Paul