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When de-energizing shunt reactors with load interrupters, reignitions are likely to occur. The resulting high frequency transients have been investigated for a typical EHV installation by computer studies and field tests. These transients can be eliminated or minimized by controlling the instant of contact parting. They can also be reduced by low ohmic opening resistors. The dielectric requirements for BPA's 500-kV shunt reactor installations are discussed. It is shown that even in installations with reduced insulation levels routine

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