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  • Users: NCTHAI
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  1. NCTHAI

    Types of battery used in UPS and Electrical Substations

    Looking for installation of batteries in industries for UPS application and in electrical substation for back up power. Would like to know what types of batteries are installed / recommended to use in industrial UPS application and in electrical substation back up control power. What is the %...
  2. NCTHAI

    M-PACT ACB and Rogowski CT

    Dear All, We are doing the M-Pact (Old one - GEC ALSTOM manufactured, not GE manufactured) CBs refurbishment and understand that the MPro relays were supplied with CTs installed on these breaker mounting. The CTs are Rogowski type (flexible type). I cannot find any details of these CTs...
  3. NCTHAI

    Selection of Motor Overcurrent relays:

    The plant motors are supplied from MCC that has two incomers, two bus sections and bus coupler. MCC incomers has changeover scheme - in the event of any one of the incomer opening on under voltage, respective incomer will open, allow faulty bus voltage to drop below 35% and then close bus...
  4. NCTHAI

    Alstom UK Manufactured MP42W Circuit Breakers

    Dear All, I am looking for Alsthom UK manufactured MP42W circuit breaker manuals and installation drawings. These circuit breakers were manufactured in Alsthom UK factory and were parts of Galaxis swithgear. I know that these breakers were taken over by GE (Now ABB). I have tried with GE...
  5. NCTHAI

    Power System Planning Book

    Experts, GE in olden days used to publish the Power / distribution System planning handbook. Does any one has copy ? Can you please share? Regards, NC
  6. NCTHAI

    Hazemeyer parts catalogue

    Dear All, Looking for Hazemeyer MCC spares. I have the part numbers and descriptions. Contacted Hazemeyer with details. However, Hezemeyer says they do not recognise the part numbers. Did google search and found catalog on Eaton site. What i found is part numbers are similar but they are...
  7. NCTHAI

    MCC Maintenance Spares

    Hi All, Can any one share the process of deciding about maintenance spares for HV / LV Switchgear and MCC? What should be the basis to select the spares for MCC for 1 year, 3 year, 5 year and 10 year of operation and maintenance? Any recommendations, guidelines, papers or reference...
  8. NCTHAI

    Motor KW Readings

    We are commissioning the plant and carrying out no load run 3 similar 6KV / 1000 KW / 8 poles / 118A / motors. For 2 motors we have seen the motor KW of 28KW but for one of the motor motor KW of 13 KW. The no load current of motor per data sheet is 42A at 6000KV. We have seen 46 A for all...
  9. NCTHAI

    Motor No Load Currents

    Carrying out the no load run of various motors as part of project commissioning. It is noticed that for small motors, the no -load current is near to the full load current. However, as motor rating increases, this becomes smaller as compared to full load current. For mid range motors, noticed...
  10. NCTHAI

    CT wiring for switch gear

    Can experts share their experience pertaiing to CT Wiring? Here is the conditions for substation under advance stage of energization: 1) CBCT (Core Balance Current X'mer) is used for earth fault protection in motor feeders and distribution trasnformer feeders (outgoing). CBCT Ratio 150/1 A...
  11. NCTHAI

    Heater Rating Calcultion

    This looks to be simple for lot of people but I am still learning. Looking to calculate heater capacity required to heat water from 40 to 150 Deg C at pressure of 6 to 7 Bar. Using imperical formulae Q= Delta T X Cp X V got 183.33 KWH required to heat water. However need to know KW rating of...
  12. NCTHAI

    Lub Oil Varnish

    Team, I am new to this forum. At our powerplant we are looking for various methods for varnish controls and has installed two different system. In order to evaluate oil conditioning system for varnish removal, have taken sample before and after systems were in place. Can you please let...
  13. NCTHAI

    Varnish Measurement in Lubricating oil

    Team, I am new to this forum. At our powerplant we are looking for various methods for varnish controls and has installed two different system. In order to evaluate oil conditioning system for varnish removal, have taken sample before and after systems were in place. Can you please let...
  14. NCTHAI

    Megger under Vacuum for Transformer

    X'mer ratings: 220/15.75KV // 300 MVA // OFAF // YNd1 // 10.5% Had 220KV transformer under maintenance and vacuum pulled on tank for several days (At least 4-5). When tank under vacuum, IR at 1000 V DC was measured. Values are very good. It is said in the manual that do not apply...
  15. NCTHAI

    Transformer IR Measurement

    Question of testing the transformer: EHV Trasnformer: 220KV / 15 KV // YNd11 // 250MVA // ONAN / ONAF Is it normal to test PI for Oil filled transformer?? I guess not. PI (IR 600 Sec / IR 60 sec) is not valid measurement for Oil Filled transformers due to the oil inulation. PI is valid for...
  16. NCTHAI

    D11 Steam turbine buckets tip

    Does any one knows vendors whoc can supply D11 Steam Turbine blades (Buckets) tips and covers? If yes, please provde references to them.
  17. NCTHAI

    Generator Maintenance code

    Gents, are you aware of any technical code that mandates Power Stations' Generator maintenance and electrical testing? Thanks, NC
  18. NCTHAI

    Grade 91 Steel Performance

    Has anyone come across issues with Grade 91 steel performance? The grade 91 steel metullurgy changes dues to welding, stress, operating temperatures and other service parameters. Has any one come across this issue? Has there been any in service failures experinced? What are methods for...
  19. NCTHAI

    Generator bearings Insulation

    It is noted that Generator bearings (Only one) is insulated. - Why generator bearings are insulated? - What is minimum acceptable insulation resistance for operation? - Can the bearin IR measured on line? (when generator is running) - If yes, is it possible that IR value may differ for on line...

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