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The test of a three-phase fault at a bus implies the concept of bringing the bus to ground, with a zero impedance (infinite admittance) but from a computer coding limitation, a large admittance value is used to simulate this type of test.

The restriction that during fault, the solution must still converge is not valid during the fault period when voltage is zero (or even of small value). Post-fault conditions (recovery of voltage) will allow the load flow to converged again.

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