Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng 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. electricnewbie

    DC or AC Spring Charging Motor

    For those in favor of DC motors, would you still use this philosophy on >230kV, independent pole breakers?
  2. electricnewbie

    SEL "Connectorized" Review

    Has anyone had good or bad luck with SEL's "Connectorized" relays? We've typically used the screw type terminals.
  3. electricnewbie

    Most cost effective battery for large electric power storage?

    Here is an example 10 MW battery system you could build... http://gigaom.com/cleantech/xtreme-power-a-super-battery-for-hawaiian-wind-farms/ It may be a little pricey for a machine shop.. all you need is a $117 million dollar DOE loan.
  4. electricnewbie

    Capacitor Inrush Current

    That is the typical size of bank at that voltage. Most new bank locations have two 12 MVAR banks, each with their own breaker. The utility also has several smaller sub-transmission cap banks to support the 115kV voltage.
  5. electricnewbie

    Capacitor Inrush Current

    Hello all, I’m trying to find the inrush current a new 12 (24MVAR future) 115kv Capacitor bank. I found the formula: I(max)=1330*?(KVAR/LS) for 60hz, Where, LS is the system inductance in microhenries. Now, I know that: Xl=2?fL=377*L Or... L=Xl/(2*pi*f) So my question is, should I just...
  6. electricnewbie

    Physical Separation of Primary and Secondary Relaying

    I am curious to see how other people incorporate physical separation in primary and secondary line relays, I'm not talking about separate DC, CTs, etc. On 115kV to 230kV transmission lines, is it necessary to use different panels? If the two relays are on the same panel, is it best to put...
  7. electricnewbie

    Proper Control Schematic - Switch Contacts

    What is the proper way to show Control Switch contacts on DC Control schematics? Is it best to: 1) show all contacts as a simple open contact symbol, having a contact development show which contacts are closed during different switch positions, labeling next to the contact what state the...
  8. electricnewbie

    Breaker Fail Philosophy

    Good point. There is a large debate for old school vs new school here, and you all have great information for me to have an understanding in the debate. Thanks again.
  9. electricnewbie

    Breaker Fail Philosophy

    Would it be easier to do BF on all tripping device, (differential lockouts, primary & secondary line relays, etc) though a dedicated BF relay? Thank you bacon4life for that document.
  10. electricnewbie

    Fuse Rating for Short Circuit

    Rafiq, So you are saying the fuse should blow just fine, except it may not be able to interrupt the current during a fault (since it is rated well below the availble fault current)?
  11. electricnewbie

    Breaker Fail Philosophy

    Thank you all for your suggestions. Hopefully we can come to a conclusion on how we will apply BF for future applications.
  12. electricnewbie

    Breaker Fail Philosophy

    I am fresh out of college and entered a Substation/Transmission Engineering position, where currently there is a debate on Breaker Fail philosophy. The question is: On a radial 115kv substation (designed to expand to breaker and a half scheme) is it best to: 1. Use a separate 50BF relay...

Part and Inventory Search

Back
Top