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

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...

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...

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.

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.

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

My CT ratio is 150/5

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

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...

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...

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.

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.

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

Thanks alot guys its a great help

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