ABB RET670 Commissioning Manual

Also see for RELION RET670: Operator's manual Commissioning manual Product guide Installation manual Commissioning manual

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ABB RET670 Commissioning Manual Manual pdf 133 page image

Table 28:Test points for phase-to-earth loop L3-E (Ohm/loop)Test point Value Comments1 X [X1+XN] XN=(X0-X1)/3R 02 X 0R RLdFw3 X 0.85·[X1+XN] R≈0.491·(X1+XN)+RFFwPER 0.85·[X1+XN]·1/tan(60°)+RFFwPE4 X 0.85·[X1+XN]R -0.85·[X1+XN]·tan (AngNegRes-90°)5 X RFFwPE·tan (ArgLd)R RFFwPE6 X -0.5·RLdFw·tan (ArgDir)R 0.5·RLdFwThe table showing test points for phase-to-earth loops is used together with figure31.Table 29:Test points for phase-to-phase loops L1–L2Test point Value Comments1 X X1R 02 X 0R RLdFw3 X 0.85·X1 R=0.491·X1+0.5 RFFwPPR 0.85·X1·1/tan(60°)+0.5 RFFwPP4 X 0.85·X1R -0.85·X1·tan (AngNegRes-90°)5 X 0.5·RFFwPP·tan (ArgLd)R 0.5·RFFwPP6 X -0.5·RLdFw·tan (ArgDir)R 0.5·RLdFwThe table showing test points for phase-to-phase loops is used together with figure32.11.4.6.1 Measuring the operating limit of set values GUID-B1B7DEB6-7BC3-4A90-8D8F-E4E69B434AFA v3Procedure:1MRK 504 165-UEN A Section 11Testing functionality by secondary injectionTransformer protection RET670 2.2 IEC 127Commissioning manual