the circuits and equipment describe

the circuits and equipment described in this clause are developed to allow tests that simulate the full range of anticipated grid faults, including:single fhase to ground fault (any phase)two phase isolated fault, between any two phasestwo phase grounded fault, involving any two phasesthree phase short-circuit faultA full discussion of three faults and the resulting impact on voltage magnitude and phase angles is included in Annex A,The short circuit emulator and grid simulator described in 433 and 434 are informative examples and are not intended to restrict design flexibility. Other designs may be used to achieve equivalent test functionality.