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  1. SRA007

    Power Transformer Switching

    How often one can switch on and off 1MVA oil filled transformer in a Year just for doing daily maintenance on the downstream circuit.
  2. SRA007

    Relay Setting Micom P225

    Dear Engineers I am trying to set up a Micom Relay P225. The Curve I want to set is 49 thermal overloads. Could anybody explain what these parameters shows on the relay menas and how I could chose effective settings? Test sheet from the manual is attached shows the parameters. Kind Regards...
  3. SRA007

    Over Current Protection Relay J.G.Statter & Co Ltd

    Hi I am working on an old switchgear form year before 1967 the manufacture of the switchgear relay is J.G.Statter & Co Ltd could anyone please tell me that how overcurrent protection on this switchgear works and do we have any protection characteristic curves for it. Please find the photo of...
  4. SRA007

    TRANSFORMER INRUSH CURRENT

    Dear Friends could you pelase tell me that what is normal multiplying factor for transformer inrsuh current. for exammple if the HV Amps are 100 so by which factor we will multiply it.
  5. SRA007

    Earth Fault Scale

    Could anyone please provide a range of typical values for GPR(Ground potential Rise).Touch and Step Potentail that should be expected within an 11kV/0.4kV distribution substation i.e i am looking foa a scale for example 0-1kV.
  6. SRA007

    UTILITY CONTRIBUTION

    Dear Friends, What type of fault(ik,ib,ip) do we use for utility contribution while running a electrical study.
  7. SRA007

    UNRISTRICTED EARTH FAULT MICOM P120

    My CT ratio is 150/5
  8. SRA007

    UNRISTRICTED EARTH FAULT MICOM P120

    friends I am working with micom p120 relays , and have to produce the UNRISTRICTED EARTH FAULT settings. could anybody please let me know how to calacuate the settings. Regards SRA007
  9. SRA007

    IEC 60909 VS IEC61363

    Hi We are performing an IEC Fault calculation on the off shore installation. The switchboard rating is at offshore is 25kA for 1 sec which i assume is Ib(IEC60909).the calculation i am doing is IEC 61363. The result I am getting form the software is T0,T1,T2,T3 and T4 AC,DC and total. Now how I...
  10. SRA007

    Reyroll 2B3 High Impedance Earth Fault Relay

    Hi I am working on Reyroll 2B3 High Impedance Earth Fault Relay. The information i got that relay is fixed at 20mA with Voltage setting form 15V to 250V. I have to present the characteristic of this relay on time current characteristic Graph. Could anybody please tell me that how i can show...
  11. SRA007

    ARC FLASH LINE SIDE PROTECTION

    I am using 12X inrush current of transformer, if i change more setting of the Relay there is a chance that it will trip while re energising.
  12. SRA007

    ARC FLASH LINE SIDE PROTECTION

    I am trying to protect the line side of the switchboard, I tried to change the setting of HV really above the transformer but it seems to cause instability. Does any one know any thing practically or theoretically how to protect the line between the switchgear and transformer.
  13. SRA007

    Arc Flash

    Can anybody Explain instantaneous Overcurrent relay functionality and how does it will help in reducing the incident Energy.
  14. SRA007

    MUT 1 Relay

    Thanks alot guys its a great help
  15. SRA007

    MUT 1 Relay

    Friends I am looking for a relay MUT-1 type (Sprecher + Schuh). Does anyone have any technical information about it. Thanks

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