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  • Users: lansford
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  1. lansford

    LV & Single Phase Arc Flash

    It is common knowledge and often noted that IEEE 1584 does not apply to LV single phase systems and the results are conservative for example 240 volts three phase systems sourced from "small transformers" as well. Plant electrical personnel quickly loose confidence in arc flash studies (labels)...
  2. lansford

    Your Utility Arc Flash Practice 480 V Meter Cabinet

    For HOT WORK in the CT revenue metering cabinet (on line side of customer main) Does your utility use IEEE 5184 calculations for this? Some members of our group feel, it give a too consrvative number (as expected with High side fuse as protective device only) since some research orgnizations...
  3. lansford

    Blocking Pilot POTT schemes for GOAB switching

    For a 138KV fiber optic POTT scheme on network lines with a POTT instanteous O/C ground setting of about 300 amps, does your utility block the scheme during GOAB (group operated air break switching) on the lines? thanks JIM
  4. lansford

    Companion CLF with Cutouts Practices

    Our utility is looking at its practice of installing a CLF with a NEMA rated link (K) Cutout at 12.47KV O/H. We install them wherever the fault current exceeds 5KA sym. Our standards say our lowest rated cutouts are rated 6.2KA sym. Hearsay notes we install them due to dist. tranformer withstand...
  5. lansford

    Momentary rating 69KV Delta Star Switch

    Does anyone have this info? Switch Data is 78KV; 400 Amp, Type MA;-3911; S/N D-31055X3 Three Pole Group Operated Manual Air Break Current supplier Turner can't help and search did not help Better yet, if there is a table or other data out there it would be appreciated. Thanks Much JIM
  6. lansford

    Selling Software License

    I have several expensive EE software packages with a current license. Can the license be sold to another person/firm and if so where do you market them? thanks JIM
  7. lansford

    ELECTROLYSIS CELL RECTIFIER HARMONICS

    At a new installation, a rectifier is feeding a DC electrolytic cell making sodium hypochlorite (bleach). The rectifier is rated 110 KW input three phase, 480 volt 60 Hz.It has a tranformer input and its design at rated load is 90% power factor with an IEEE 6 pulse type harmoinic current...
  8. lansford

    Rectifier configuration Harmonics

    This appliction is two 110 KW, 480 volt three phase rectifiers feeding an electrolysis system. One rectifier consists of an iso transformer with a double star output with a diode in each output. (6 diodes) It has a delta primary winding but with back to back SCRs in each line (full wave bridge...
  9. lansford

    AutoCAD Symbols Electrical Grounding Connectors

    Can someone suggest a site for these typical CAD blocks with possible detailed connections to ground rods, rebar, ladders, etc I tried a major connector mfgr (Burndy) and they say they don't have any AutCAd details. thanks JIM
  10. lansford

    FAULT RATING HP RATED DISCONNECT SWITCH

    Non fused HP rated disconnect switches (at motors) are mostly rated 10,000 amps at 480 volts. Assume there is NOT an interlock (micro switch back to the contactor) to make sure that the contactor is dropped out when the switch is open, there is a slim chance the HP rated switch can be closed...
  11. lansford

    EE Consulting for Mining Facilities

    Dear Associates, I am a PE doing consulting work for industries and I have a strong background and experience in mine power for draglines, power shovels, plant facilites etc. I would like to do more consulting in this field but the local anthracite area is dead and mine operators don't like to...
  12. lansford

    AutoCAD symbols electric pole line distrbution equipment

    Can someone recommend a source for purchase an inexpensive library for these types of symbols ? Thank you JIM
  13. lansford

    AutoCAD symbols for Overhead Pole Line Distribution Equipment

    Can someone suggest a source for purchasings this type of symbol library. Thank you Jim

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