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PS2-Q8 : Migration

This question refers to migration scenarios or procedures. Migration is very individual depending both on starting point and end point, which have to be clearly specified:

Starting point: Hardwired or serial (proprietary) or mix

End point: Completely IEC 61850 or retaining some of the existing non-IEC 61850 compatible equipment

Nevertheless, the migration procedure with all boundary conditions has to be clarified

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PS2-Q8 : Migration

Mixing parallel wired parts and parts with serial communication according to IEC 61850 needs a solution, mainly on station level being able to handle both. This requirement is typical for a stepwise retrofit over month or years. It is very convenient to keep interbay functions like interlocking hardwired at least for this period.

If some parallel wired parts should retained, a proxy server is needed representing the legacy data according the object model of IEC 61850 and communicating these according the rules of IEC 61850.

Future migration will be easy when it is based on an already existing system conformant with IEC 61850 and formally described by SCL.

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PS2-Q8 : Migration Example: Stepwise retrofit of the 380 kV Substation Laufenburg (Switzerland)

100 Mbit/s Ethernet Ring Bus

withSwitches

IEC 61850

380kV Feeder after Retrofit

ProtocollConverter

Bay Control Protection

Main 1

ProtectionMain 2

IEC 60870-5-101Time receiverTime server(SNTP)

Migration of

7 Feeders in

total

Existing Third PartyStation Level

Existing Installation

beforeRetrofit