ABB REB500 Technical Manual
Also see for Relion REB500: Product guideApplications manualCommunication protocol manualTechnical manualProduct guide
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Contents
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1MRK 505 350-UEN Section 6Additional functionsTechnical Manual 59Distributed busbar protection REB5006.2.3 Release by “31805_External release BB zone”There is a “31805_External release BB zone” signal for every protection zoneconfigured on the central unit (e.g. enable trip-ping of BB zone 1, enable trippingBB zone 2 etc.).They are binary inputs and enable intertripping of the busbar zones by therespective functions (see Fig. Figure 26).If busbar sections are connected (e.g. by a longitudinal isolator), tripping is onlyenabled when all the relevant “31805_External release BB zone (n)” are active(AND logic).6.2.4 Release by the internal voltage functionWhen the breaker failure protection is started by a trip from an external distanceprotection measuring a remote fault, it is possible that the voltage collapse at theREB500 location is too little for the undervoltage criterion to respond. In suchcases we do not normally recommend that the undervoltage function interlocks abreaker failure trip. If this is done anyway, the undervoltage release setting must beverified by calculating the power system conditions.Should the voltage measurement be invalid (i.e. the bay unit isswitched off or there is a power supply failure), tripping by therespective bay is enabled since the protection must not be blocked.The release by the internal undervoltage criterion can refer to bay unit functions orto a protection zone.All VTs assigned to a protection zone are evaluated when enabling tripping of acomplete protection zone. Assignment is done by the intertripping logic, i.e. itdepends on the status of the isolators. Tripping is only enabled when all voltagefunctions assigned to the protection zone in question generate an enabling signal(AND logic).6.3 Trip redirectionIf a circuit breaker is unable to trip (e.g. air pressure too low), REB500 receives thesignal “Trip redirection” from it.When this signal is active and a trip signal being applied to the circuit-breaker (e.g.“External TRIP” or “BBP TRIP”, see Figure 27) REB500 automatically trips allcircuit-breakers surrounding the fault. |
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