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  1. sanalv

    Connection to local utility

    Dear all: We are installing a generating center to supply loads to an industrial Plant. The generating center is gas internal combustion motors based, totaling 21 MW. Generators terminal voltage is 4.16 kV, there are installed step up transformers to bring voltage to 34.5 kV. Our 4.16 and...
  2. sanalv

    Detection relay of change of state

    Hello: We have an electrical substation and a generation power plant 600 meters away. We need to detect the change of state of the contact of an electromechanical relay in the substation at the power generation plant in less than 30 miliseconds. Really, there are 10 discrete signals running...
  3. sanalv

    CT Type for Earthing Transformer Protection

    At least, theoretically, in case of an external single phase to ground fault, only Io current shall circulate in the three phases of the Z-transformer and then no current to flow outside of the delta connected CT´s, towards O/C relays. For single phase (or multiphase) faults in the...
  4. sanalv

    STEP and TOUCH VOLTAGES ASHPHALT

    You could consult "IEEE Guide for safety in AC substation grounding. IEEE Std80-2000." This standard states the procedure to calculate the allowable step and touch voltages and tables with typical surfaces material resistivities.
  5. sanalv

    Under reaching Zone 1 of Distance relays

    Sorry HiSet. I have read some technical documents that reference the paper, I have been looking for it on the Net with no luck at all, up to date.
  6. sanalv

    Under reaching Zone 1 of Distance relays

    If I well understand your question, you can have a look to Walter A. Elmore, "Zero-sequence mutual effects on ground distance relays and fault locators", 46th Annual Protective Relaying Conference at the Georgia Institute of Technology, Atlanta, Georgia, April 29-May 1, 1992.

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