In cases of differential schemes, can we achieve the differential trip using IEC 61850 communication without using hardwiring?
You can refer this paper for your work as it is similar.
Design and simulation of communication architecture for differential protection in IEC 61850 based substations
http://dx.doi.org/10.1109/INDICON.2015.7443859
I think there is no problem with this issue. For example, in power transformer differential protection analogue values from the CTs located on Low and High voltage sides should be properly sampled with the help of merging units (MU) and then transfered to the power transformer protection device by IEC 61850-9-2LE SV protocol.
Data models contained in IEC 61850 can be mapped to a number of protocols as manufacturing message specification , generic object oriented substation event and sampled measured values. The latter can run over TCP/IP networks or substation LANs using high speed switched Ethernet to obtain the necessary response times below four milliseconds for protective relaying. I think that you can achieve the differential trip using IEC 61850 communication without using hardwiring.
With my PhD student we made such experiment: with 2 IEDs for simple bus protection scheme - IEDs exchange GOOSE m-s for direction of current. In case of bot IEDs see "fault in reverse direction" - it is tripped by both breakers as the fault should be within the zone defined by the IEDs location - on the busbars of the node point.
You can refer this paper for your work as it is similar.
Design and simulation of communication architecture for differential protection in IEC 61850 based substations
http://dx.doi.org/10.1109/INDICON.2015.7443859
how many bits can be transferred through a single channel of IEC 61850?
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