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: *

  • Users: Electrifier
  • Order by date
  1. Electrifier

    Summation Cts

    Correct me plz, if i got it wrong; Generally, there are three possible ways to get summation of 02 circuits for metering or protection purpose; • DIRECT SUMMATION: Combine the CT secondary circuit of similar phases at the end of your existing secondary circuit (Scan over Partial differential...
  2. Electrifier

    Motor Protection Scheme In Question

    Your are right for disabling Instantaneous O/C trip functions of Multifunction relays. On a solidly grounded system 50G element should not trip contactor as well. 51 Element (Normally available as Mechanical Jam)is set to trip contactor. It can be set to initiate alarm as well, on a lower...
  3. Electrifier

    Earth Fault Protection on Low Voltage System

    Please provide as below for a better analysis of problem; • specification/Manufacturer/model/rating of Incomer and feeder breakers. • Specification, setting, input sensing(ZCT or residual connected CT), CT/sensor ratios • What type of loads are fed by feeder breakers (Motor/transformer/LV...
  4. Electrifier

    Motor Protection Scheme In Question

    MANDATORY PROTECTION REQUIREMENTS FOR LV AND MV STARTERS PROTECTED BY MULTIFUNCTION RELAYS • Thermal O/L Protection (Ansi Device 49): Overload (O/L) protection is always applied to motors to protect them from overheating.(Sends trip signal to contactor or Circuit Breaker) • Instantaneous Phase...
  5. Electrifier

    Motor Protection Scheme In Question

    Further to good comments as mentioned above, NEC Article 430-52 and Table 430-152 dictate phase and ground fault protection for low voltage motor circuits but the type of protective device is a designer’s choice. There are five types, each having different benefits depending on the size of the...
  6. Electrifier

    CELERON 1.7GHZ VERSES PENTIUM4 1.7GHZ

    friends, I want to buy a new PC. Will you please tell me that what are deficenices of CELERON verses INTEL P4 of same speed. My applications are simple as net surfing, MS OFFICE and CAD works.
  7. Electrifier

    Power generation, circulating current problem

    as i have seen on caterpillar generators, DROOP CT is normally connected in parrallel of droop potentio. If CT polarity is reversed, it will cause to pick excessive reactive power at start and draw a high amount of stator current. If the polarity is ok, You can adjust VAR share by droop ptoentio...
  8. Electrifier

    Asymmetrical fault current

    hi friends, I am not much competent like you all but i have read some where that Asymmetrical current is vector sum of AC and DC components of current at the time of inrush current.Symmetrical current is vector sum is positive sequence, negative sequenceand zero sequence currents.
  9. Electrifier

    IDMT and Instantaneous relay

    Friends, Can you please tell me about the operation of IDMT and instantaneous relay with the aid of diagrams.
  10. Electrifier

    Electrical Drawing software

    Friends, Can any ony one tell me the best downloadable software for drawing electrical schematics with symbol libraries.
  11. Electrifier

    Sub routines

    Friends, Can some please tell me the function of SUB ROUTINES and JSR as concerned with AB SLC 500 PLCs.
  12. Electrifier

    How to Calculate/formula Current Leakage (mA) in Distribution system

    Jonos. Switch off the main breaker and switch on all distribution breakers and switches. Measure the insualteion resistance with Megger with any cable (Phase or neutral)
  13. Electrifier

    How to Calculate/formula Current Leakage (mA) in Distribution system

    Put the clamp meter on cable(with out ground conductor and armoured)you will find the leakage current, but the clamp meter suppose to be very fine. The leakage is almost equal to the phase voltage divided by insulation resistance of distribution circuit for single phase.
  14. Electrifier

    Insulation Resistance test - from switchgear or motor terminals?

    Preferred way is to check IR from Switchgear end, as it verifies the integrity of complete loop. Obtained reading is actually almost same as motor IR with out leads because the cables always have a high insulation and IR as well.
  15. Electrifier

    Motor Trips During Voltage Sags

    Thermal overload devices are not able to respond so quickly(4 cycles). It seems that there is some problem with control supply. Contactors are dropping out at voltage sag, if voltage sag is less than drop out value of contactor, even for one cycle, contactor will drop out. Normal these type of...
  16. Electrifier

    Demo Software for SLC5/04 PLC of AB

    Friends, How can I download free software and tutor for SLC5/04 PLC of AB
  17. Electrifier

    Gas Turbines 1-30MW

    Dears, Can some one tell me useful site f0r 1-30MW gas turbine driven generators, containing information about turbine operation and securities
  18. Electrifier

    Power Supply for ESD Systems

    Thanks, DPC. All information is valuable and seems to be best practicable. What do you think about power supply, AC from UPS or DC with battery backup? Is there any web site containing information in this concern
  19. Electrifier

    Power Supply for ESD Systems

    The system is suppose to be used at oil&Gas exploration unit. System is used to shutdowm the Generators, engine driven compressors, pumps, ESV's of Seperators and vessels in case of any emergency. ESD System is suppose to be activated by Hand operated Emergency push button stations and process...
  20. Electrifier

    Power Supply for ESD Systems

    Dears, Can you please give me the information about preferred power supply for Emergency shut down systems i.e. AC supply from UPS or DC supply with battery backup. What is the preferred state of input loops i.e. open loop or closed loop. If there is any site containing information about this...

Part and Inventory Search

Back
Top