Thanks for the answers gentlemen.
For the older style relays where several tap ranges are available, is there a difference in the characteristics (curves) of the same relay with different selected tap ranges? Or do they overlap over the values that the range is the same?
I ask because I'm...
Hi Everybody,
I have a simple question regarding 50/51 overcurrent relays.
I understand that these relays have both a tap range and a tap setting within that range. Some of these ranges however overlap, i.e. Tap range 1.5-6.0 & 4.0-16. My question is if I have a tap setting of 5, does it...
Hi Everybody!
I have a contradiction between theoretical induction motors and actual induction motors I can't seem to wrap my head around.
In theory, motor efficiency is characterized by 1-s where s is the motor slip, i.e. Pout = Pag(1-s), where Pag is the motor air gap.
This implies that...
Thanks ijl!
Great! now my calculation comes pretty close :)
The reason I want to learn the manual calculation is so i can better understand the results and data input required for the software.
Thanks again for the help!
Hi friends!
I recently tracked down an EC&M article discussing the calculation of short circuit calculations using the p.u.
They have the following for fault impedance calculation of:
ZFault=(Zutility+ZT1)||ZMotor1||ZMotor2=(0.0021+j0.083+0.005+j0.07)||(0.49+j13.8)||(29.8+j298)=0.166+j2.817 pu...
