● Currency setting group (CUG)
● Visible string setting (VSG)
● Curve shape setting (CSG)
Of these, only ENS and ENC types are available from a MiCOM P40 IED when publishing GOOSE messages, so Data
Objects using these Common Data Classes should not be published in mixed Edition 1 and Edition 2 systems.
For compatibility between Edition 1 and Edition 2 IEDs, SCL files using SCL schema version 2.1 must be used. For a
purely Edition 2 system, use the schema version 3.1.
7.4.11.3 STANDBY PROTECTION REDUNDANCY
With digital substation architectures, measurements can be shared freely on the process bus across the
substation and between different devices without any additional wiring. This is because there are no longer any
electrical connections to instruments transformers that restrict the location of IEDs.
The new IEC 61850 Edition 2 test modes enable the introduction of standby protection IEDs at any location within
the substation, which has access to both station and process buses. In the case of failure, these devices can
temporarily replace the protection functions inside other IEDs.
Figure 302: Example of Standby IED
See the example below. If a failure occurs in the Bay 1 protection IED (MP2), we could disable this device and
activate a standby protection IED to replace its functionality.
Chapter 22 - Communications P543i/P545i
594 P54x1i-TM-EN-1
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