The SMVSENDER function block must be added to the ACT configuration and connected to at least one triplet or residual channel to activate SMV sending. Unused channels in SMVSENDER must be connected to GRPOFF. As a result, the sampled value control block and the related data set are automatically added to the protection relay configuration. Relay supports sample rate of 4000 samples per second in a 50 Hz system.
A maximum of 16 SMV channels can be received. Different combinations of these channels, such as two SMVRCV blocks using eight channels each or four SMVRCV blocks using four channels each, are possible as long as the number of used SMV channels does not exceed 16. The total number of channels that the relay can process is 64 including local, remote and calculated channels. Forwarding of received SMV channels through SMVSENDER is not supported.
REX640 however also calculates the I0 from individual phase current when received over SMV, using this calculated I0 instead (ILTCTR IRES_CLK output) is a possible workaround.
Additionally when sending calculated I0 over SMV the maximum usable primary current setting is 11,8 kA in the sender IED. Exceeding this setting value results in zero amplitude for calculated I0 in SMV stream. Workaround for this is also to use calculated I0 in calculated in receiver instead (ILTCTR IRES_CLK output).