ABB RELION REB500 Technical Manual

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ABB RELION REB500 Technical Manual Manual pdf 43 page image

5.1.6 Configuration5.1.6.1 General GUID-4860E469-1FF3-441D-B6B9-C6A13A87149D v1The first parameter in the sub-menu General isRef length. It is used to display the faultdistance when the function trips and has no influence of the protection function itself. Theparameter states the reactance of the reference length (in secondary Ω/ph per unit length)and may be set to display km, miles, percent line length and so on, that is,.Distance ref. lengthmeasXFor example,• To display fault distance in kmSecondary reactance per km = 0.2 Ω/phaseRef. length = 0.2 Ω/phase• To display fault distance in % of line lengthSecondary reactance of the line = 25 Ω/phase (1% = 0.25 Ω/phase)Ref. length = 0.25 Ω/phaseThe setting of the parameterCT neutral depends on whether the star-point of the main CTs ison the line side or the busbar side. There are thus two possible settingsBus side orLine side.TheLine side option is the one to choose, providing the protection is connected according tothe wiring diagram in the appendix.The parameterAnalogue inputs determines whether the neutral current isconnected to an analogue input (settingI0 input) or is derived internally. Theinformation icon alerts the reader of important facts and conditions.5.1.6.2 Starters GUID-3570AA0F-8DE9-46B0-B18F-21CFB453AF53 v1The distance function provides for two methods of starting, that is, overcurrent orunderimpedance. The desired method is selected by appropriately setting the parameterStartMode in the STARTERS sub-menu.Depending on the setting of the parameterDefDirMode, a starter can also trip on its own afterthe timeDelay (Def).Overcurrent starters GUID-EE5ECD9D-422E-46A4-A02A-E7D61151EFD5 v1The overcurrent starters are enabled by selectingOC for the parameterStartMode. The pick-up level of the overcurrent starters is determined by the setting of the parameterIStart. Thecorresponding setting range is from 0.5 to 10 IN, in steps of 0.01 IN. The setting ofIStart mustbe sufficiently above the maximum load current to avoid any risk of mal-operation undernormal load conditions. Note that all currents greater than 80% of the highest phase current(and also the enabling currentImin) are taken into account by the phase selection function.When determining the maximum load current it must be considered that:• In the case of a double-circuit line, the load current IB can briefly reach double its normalvalue when one circuit is tripped.• Ground faults can cause additional balancing currents IA in the healthy phases.1MRK 505 406-UEN B Section 5Bay protection functionsBay protection functions REB500 37Technical manual© Copyright 2019 ABB. All rights reserved