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Generator Negative Sequence Protection

Generator Negative Sequence Protection

Generator Negative Sequence Protection

(OP)
Does any one know how to calculate generator I2^2 t curve for coordination purposes?

I know that K varies between 2 - 40 and I2 is percent of stator FLA. What percent of FLA is used to draw the curve?

Hope the question makes sense.

Thanks in advance

RE: Generator Negative Sequence Protection

Typically the manufacturer specifies the value for K. (30 is common for cylendrical rotor machines). The curve is drawn for t = K/I2^2. I2 is per unit of nameplate current. I don't know if that answers your question or not.

RE: Generator Negative Sequence Protection


The ability of a generator to accommodate unbalanced currents is specified by ANSI C50.12 and ANSI C50.13 in terms of negative-sequence current (I2).  IEEE C37.102 specifies the continuous I2 capability of a generator and the short time capability of a generator, specified in terms I22t and defined in a dual-slope relationship plotted against generator MVA.  
  

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