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help me to calculate stabilizing resistor for earth fault relay

help me to calculate stabilizing resistor for earth fault relay

help me to calculate stabilizing resistor for earth fault relay

(OP)
hello engineers, please help me to calculate stabilizing resistor for earth fault relay. as i know,

Rstab = V/I

i know how to find v, but i am confused about I value. whether i use CT secondary current (i.e) 5A or relay setting current. looking for your help..

RE: help me to calculate stabilizing resistor for earth fault relay

For what relay ? What's the applucation ? What's your relay setting both 50 and 51 ?

I guess you are using residual CT connection and not a core balanced CT? (had to ask).

RE: help me to calculate stabilizing resistor for earth fault relay

Sounds like a high impedance restricted E/F scheme. Have a look at Alsthom's MCAG relay for some examples - obviously the manual applies to this specific relay, but the principles apply to all. http://www.alstom.com/Global/Grid/Resources/Docume...

RE: help me to calculate stabilizing resistor for earth fault relay

Or is this a broken delta on a set of PT's?

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