Bus impedance matrix definitions

bus impedance matrix

reciprocal of the bus admittance matrix
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-15-18

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bus impedance matrix

the inverse bus admittance matrix
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=603-02-38

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