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 MintJulep 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. 54494060

    87 Differential tripping main breaker???

    Is it possible to disconnect the (added "small" load) and eliminate that possibility? May save some time and give you the necessary information to replace/recal your relaying. As Iron sharpens Iron so does a man sharpen the countenance of his friends.
  2. 54494060

    Looking for TEST BLOCK

    Wanted to thank you all for the replies to the "TEST Block". FYI It turned out to be: STATES / MULTI-AMP / AVO INTERNATIONAL P/N C3-209-K 9 POLE TEST SWITCH. Your responses as always were/are greatly appreciated and always full of valuable info. I would have liked to have seen an Eng. Tips...
  3. 54494060

    Looking for TEST BLOCK

    Thanks dpc: I was in the Turbine Supervisory Panel looking at the existing "TEST Block" this morning and saw "States MultiAmp" (now Megger) on the cover. I'm very familure with MultiAmp but first time for "STATES". Thanks for your help. I think our Procurement Engineering might have the Model...
  4. 54494060

    Looking for TEST BLOCK

    Looking for a "TEST BLOCK". Tried to GOOGLE GE Global Model NO. 1721-484 and can't seem to locate. Block has a combination of 3 single pole and 3 double pole switches. Device is used for isolation of Main Generator current (CT's)inputs to NEXIS System for trip logic. The Test Block has been used...
  5. 54494060

    IS barriers with motor RTD's

    The RTD's are "part of the motor" which is explosion proof. If a failure to a/the winding should take place at a position occupied by the RTD it would be in the Hazardous area as waross pointed out. (Motor, Equipment Room, etc.) The RTD conductors are also located inside the Haz area and have to...
  6. 54494060

    Arc-Resistant Switchgear in Arc-Hazard Mitigation Scheme

    Additional comments to all the well stated positions above. Most arc flashes in Switch Gear are the result of improper and negligent "Pedictive/Peventive" Maintenance. Design for Bus Outage Maintenance is/has (in the past) been neglected for economic reasons "I suppose". Even if you install arc...
  7. 54494060

    Motor Journal Bearing Oil Foaming

    Assuming the Motor has thermocouples at the bearings and you didn't mention any evidence of bearing temperature problems, the slinger ring and oil are performing their desired function. I agree with the contamination issue mentioned above. The rebuild shop probably cleaned the bearing journals...
  8. 54494060

    Electrical Reducing JBs

    dungun Question(s): Motor Size (HP), Motor Supply Voltage, Supply Cable Size, What Country, and what is/does "unapurtunitly" mean? 12fish As Iron sharpens Iron so does a man sharpen the countenance of his friends.
  9. 54494060

    Fiber optic cable

    gary071, I agree with tinfoil in that "Fiber Optic cables are easily damaged". Consideration to installation "pull by's and/or pulling with" other types of conductors (power cables) could damage some of the fiber conductors as well as the bend radius for fiber cables should be taken into...
  10. 54494060

    Breaker price question.

    alehman, You've been around, documentation is everything. Clean Power costs but its worth it. 12fish As Iron sharpens Iron so does a man sharpen the countenance of his friends.
  11. 54494060

    Breaker price question.

    Hellow from the nuclear industry. Keith, the price you saw sounds like what the nuclear industry pays for a Safety Related (Class 1E) Single Phase 20 Amp Breaker. A little humor from the nuclear industry. 12fish As Iron sharpens Iron so does a man sharpen the countenance of his friends.
  12. 54494060

    megger readings?

    gwalk, If you or your company (which ever owns the motor) is financially able I would pursue sending the motor out to a motor shop for rebuild or purchasing another 10hp motor. 2 weeks is a long time for a motor to be "1/2" under water. The rotor needs to be pulled and cleaned, the stator needs...
  13. 54494060

    Motor Overload Problems

    westmc, You said that the motor tripped on start (1/10 second?) after it ran. I'm not sure it ran, other than the inrush moved the rotor. I'm assuming it tripped the supply breaker on instantaneous. If that is correct, it tripped at the supply breaker, so that rules out overloads. If I am...
  14. 54494060

    Testing AC motors

    westmc, You need to go back to the beginning. Look at the source voltage (make a voltage check). If the motor will not operate and you have the correct voltage (all three phases)search for the electrical and "mechanical" integrity of your starter and control circuit. Control transformer, fuses...
  15. 54494060

    Mortor Starter rust removal on the Iron.

    Just wanted to thank you "itsmoked, jraef, waross, for your many valuable comments. I always see your handles leading comments for various posts in the Forums, and am ever learning. I have worked in an antiquated industry "Nuclear Pwr. Generation" for 27 years now and the technology is mostly...
  16. 54494060

    Mortor Starter rust removal on the Iron.

    Thanks itsmoked for your response. CRC and other electrical cleaning solvents had/have the ability to evaporate immediatly after contact so there was no liquid left on contacts or other electrical surfaces. I wasn't looking for a solvent that would leave "liquid or conductive residue" in the...
  17. 54494060

    Mortor Starter rust removal on the Iron.

    I am currently involved in performing corrective/preventive maintenance on several (68) Size 5 GE Motor Starters for a Cooling Tower Fan project. The MCC's are in enclosed outdoor Motor Control Centers, but the environment and the lack of preventive maintenance has provided quit a challenge. The...
  18. 54494060

    Canned Pump Protection (Electrical)

    This has been an interesting thread. I've been following along for a couple of days without time to add my experience with "Canned Pumps". Several years ago, we had what we called canned pumps in a system called CVCS (Chemical Volume and control). These were small horse pwr. high speed (3600...
  19. 54494060

    Megging motor

    JP Willard, I provided this info on/to the same type of Question you have in the IEEE (electrical) Code issues of the Eng. Tips Forum which is pretty standard for determining the insulation value of rotating equip. Hope it helps. This is what I refer to when asked. There may be changes (Rev's)...
  20. 54494060

    Elementary motor wiring

    Insideman, I'm not sure I understand your particular configuration (fiberglass housing) and your statement "heavy cable" but will try to give a suggestion. Corrections Welcome? Large cables lead me to assume that there may be voltage drop "distance from the 3ph 230/480 volt source". If this is...

Part and Inventory Search

Back
Top