GE Multilin B90 Low Impedance Bus Differential System 5-215 SETTINGS 5.2 PRODUCT SETUP5The GOOSE functionality was enhanced to prevent the relay from flooding a communications network with GOOSE mes-sages due to an oscillation being created that is triggering a message.The B90 has the ability of detecting if a data item in one of the GOOSE datasets is erroneously oscillating. This can becaused by events such as errors in logic programming, inputs improperly being asserted and de-asserted, or failed stationcomponents. If erroneously oscillation is detected, the B90 will stop sending GOOSE messages from the dataset for a min-imum period of one second. Should the oscillation persist after the one second time-out period, the B90 will continue toblock transmission of the dataset. The B90 will assert the MAINTENANCE ALERT: GGIO Ind XXX oscill self-test error mes-sage on the front panel display, where XXX denotes the data item detected as oscillating.For versions 5.70 and higher, the B90 supports four retransmission schemes: aggressive, medium, relaxed, and heartbeat.The aggressive scheme is only supported in fast type 1A GOOSE messages (GOOSEOut 1 and GOOSEOut 2). For slowGOOSE messages (GOOSEOut 3 to GOOSEOut 8) the aggressive scheme is the same as the medium scheme.The details about each scheme are shown in the following table.The configurable GOOSE feature is recommended for applications that require GOOSE data transfer between UR-seriesIEDs and devices from other manufacturers. Fixed GOOSE is recommended for applications that require GOOSE datatransfer between UR-series IEDs.IEC 61850 GOOSE messaging contains a number of configurable parameters, all of which must be correct to achieve thesuccessful transfer of data. It is critical that the configured datasets at the transmission and reception devices are an exactmatch in terms of data structure, and that the GOOSE addresses and name strings match exactly. Manual configuration ispossible, but third-party substation configuration software may be used to automate the process. The EnerVista UR Setupsoftware can produce IEC 61850 ICD files and import IEC 61850 SCD files produced by a substation configurator (refer tothe IEC 61850 IED configuration section later in this appendix).The following example illustrates the configuration required to transfer IEC 61850 data items between two devices. Thegeneral steps required for transmission configuration are:Table 5–1: GOOSE RETRANSMISSION SCHEMESSCHEME SQ NUM TIME FROM THEEVENTTIME BETWEENMESSAGESCOMMENT TIME ALLOWED TO LIVEIN MESSAGEAggressive 0 0 ms 0 ms Event 2000 ms1 4 ms 4 ms T1 2000 ms2 8 ms 4 ms T1 2000 ms3 16 ms 8 ms T2 Heartbeat * 4, 54 Heartbeat Heartbeat T0 Heartbeat * 4, 55 Heartbeat Heartbeat T0 Heartbeat * 4, 5Medium 0 0 ms 0 ms Event 2000 ms1 16 ms 16 ms T1 2000 ms2 32 ms 16 ms T1 2000 ms3 64 ms 32 ms T2 Heartbeat * 4, 54 Heartbeat Heartbeat T0 Heartbeat * 4, 55 Heartbeat Heartbeat T0 Heartbeat * 4, 5Relaxed 0 0 ms 0 ms Event 2000 ms1 100 ms 100 ms T1 2000 ms2 200 ms 100 ms T1 2000 ms3 700 ms 500 ms T2 Heartbeat * 4, 54 Heartbeat Heartbeat T0 Heartbeat * 4, 55 Heartbeat Heartbeat T0 Heartbeat * 4, 5Heartbeat 0 0 ms 0 ms Event 2000 ms1 Heartbeat Heartbeat T1 2000 ms2 Heartbeat Heartbeat T1 2000 ms3 Heartbeat Heartbeat T2 Heartbeat * 4, 54 Heartbeat Heartbeat T0 Heartbeat * 4, 55 Heartbeat Heartbeat T0 Heartbeat * 4, 5
