ABB RELION REB500 Technical Manual

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ABB RELION REB500 Technical Manual Manual pdf 47 page image

Should it not be possible to find a setting, which satisfies both theseconditions, the neutral voltage (3U0min) must be used for measurement inaddition to the neutral current.Phase preference logic GUID-C3BD8775-B46E-437E-B3B9-F082CFAB583E v1The desired phase preference logic for cross-country faults is chosen with the aid of theparameterPhaseSelMode.In solidly grounded systems, thePhaseSelMode parameter is disabled by setting it toSolidground orForward OR.It is essential for all the relays in ungrounded systems and systems with Petersen coils to beset to the same phase preference logic. The logic used in the system must be known beforeone of the eight alternative schemes can be selected:• L1L3L2(L1) — cyclic• L3L1L2(L3) — cyclic• L1L3L2 — acyclic• L1L2L3 — acyclic• L3L2L1 — acyclic• L3L1L2 — acyclic• L2L1L3 — acyclic• L2L3L1 — acyclicUndervoltage starters (Uweak) GUID-2E537DE1-4FD1-476E-A15F-3F0354C6C425 v1The undervoltage starters are used in conjunction with the switch-onto-fault function and thetransfer tripping schemes (POTT and PUTT NONDIR). The corresponding pick-up value is set inrelation to the rated voltage with the aid of the parameterUweak, which has a setting range of0 to 2 UN in steps of 0.01.5.1.6.3 Measurement GUID-1C206723-EE56-4815-829C-56FD2084967D v1All the settings for the impedance measuring zones are to be found in the Measurement sub-menu.Determining the distance zones GUID-05267329-6581-44F6-A236-96D275BADFAC v1Before it is possible to determine the reaches of the distance zones, the impedances andphase-angles of the line sections during faults must be known. Typical settings for the variouszone reaches along the line are given below:18000006-IEC19000408-1-en.vsdxA B Ca b123Z = 0.85 (a + k · b )bb2Z = 0.85 (a + k · b )2 1Z = 0.85 · a1Z = 1.2 · aÜRIEC19000408 V1 EN-USFigure 7: Typical settings for the reaches of distance relay zones1MRK 505 406-UEN B Section 5Bay protection functionsBay protection functions REB500 41Technical manual© Copyright 2019 ABB. All rights reserved