Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. EITengineering

    Overcurrent Relays - Tap Setting vs. Tap Range

    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...
  2. EITengineering

    Theoretical Motor vs. Actual Motor

    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...
  3. EITengineering

    EC&M Short Circuit Calculation Guide wrong???

    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...

Part and Inventory Search

Back
Top Bottom