ABB RELION REB500 Technical Manual

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ABB RELION REB500 Technical Manual Manual pdf 119 page image

Signal DescriptionBlockInp Input for blocking the function.• F: not blocked• T: blocked• xx: all binary inputs (or outputs of protection functions)Trip Tripping signalStart Pick-up signal5.6.6 Configuration GUID-3BEB8035-50E3-42E4-A31B-F0BF4F40B9CB v1The following parameters have to be set:Setting V-settingDelay DelayOver or undervoltage MaxMinNumber of phases NrOfPhasesTwo of these functions are frequently applied in a two-stage scheme. The first stage detectslower prolonged overvoltages while the second guards against higher overvoltages, whichhave to be cleared quickly.Pick-up voltage (V-setting)Single-phase VT: A setting of 1.3 UN corresponds to a pick-up voltage of 130 V at the input ofthe VT.Y-connected three-phase VTs: A setting of 1.3 UN corresponds to a pick-up voltage of 130V / √3at the input of the VT(phase-to-neutral voltage).Compensating any difference between the rated voltages of VTs UN1 and protected unit UGN isrecommended. This is achieved with the aid of the reference value of the A/D channel or bycorrecting the voltage setting.For example, for UGN = 12 kV and UN1 = 15 kV, the setting for a pick-up voltage of 1.4 UGN shouldbe:1121.4 1.4 1.1215GNNU kVU kV MaxMinThis parameter provides a choice of the following settings:• MIN (3ph): Protection picks up when all three-phase voltages have fallen below setting.• MIN (1ph): Protection picks up when the lowest of the phase voltages falls below setting.• MAX (3ph): Protection picks up when all three-phase voltages have exceeded setting.• MAX (1ph): Protection picks up when the highest of the phase voltages exceeds setting.Operating characteristic of a two-stage overvoltage protection(UN = rated relay voltage)1MRK 505 406-UEN B Section 5Bay protection functionsBay protection functions REB500 113Technical manual© Copyright 2019 ABB. All rights reserved