ABB REB500 Communication Protocol Manual
Also see for Relion REB500: Product guideTechnical manualApplications manualTechnical manualProduct guide
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Contents
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Section 2 1MRK 511 371-UENInterbay bus functions8 Communication Protocol Manual, IEC 60870-5-103Distributed busbar protection REB500Diagnostic and system events are always available for transfer whichever protocolis in use and cannot be configured.The IEC 60870-5-103 section only appears when the protocol is configured.2.4 Transfer of differential current values2.4.1 The delta/dead band algorithmTo keep the load on the IBB as low as possible, the bus zone differential currentsare checked cyclically, but only actually transferred via the bus if the value haschanged.Figure 5 Transmitted values and the zero limitTo stabilize the display during normal operation, differential currents below thezero limit (dead band) count as zero and are transferred as such.Providing the condition for transmitting a current value is fulfilled, all thedifferential currents belonging to the respective zone are sent to the SCS/SMS.sum = sum + |current – last|if sum > delta thensum = 0if current < deadband thencurrent = 0endifsend currentendiflast = current |
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