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Recent revisions of IEC 60034-27-3 and API 541 now include recommended acceptance criteria for dissipation factor (DF, or tangent delta) measurements and offline partial discharge (PD) analysis, which are common factory acceptance tests of sacrificial coil samples of new medium voltage stator windings. IEC 60034-27-3 recommends acceptance limits for DF & tip-up and API 541 recommends 100 pC for...
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