ABB Relion 670 Series Technical Reference Manual page 143

Line differential protection ansi

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1MRK505222-UUS C

Technical reference manual

The master-slave configuration is achieved by setting parameter Operation in the

slaves to Disabled for Line differential protection function, and setting parameter

ChannelMode to Enabled for the LDCMs in the slaves.

Line differential protection function in one IED can be set in test mode. This can block

the trip outputs on that IED, and set the remote IEDs in a remote test mode, so that

injected currents can be echoed back phase shifted and with a settable magnitude. The

trip outputs in the remote IEDs can also be blocked automatically. For further

information, refer to the installation and commissioning manual.

Communication of current sampled values

The currents are sampled twenty times per power system cycle in the protection

terminals, but the communication exchange is made only once every 5 ms. This means

that at in each telegram sent, 5 consecutive current samples in a 50 Hz system and 6

consecutive current samples in a 60 Hz system (three phases each sampling instant) are

included. Figure

shows the principle.

IEC05000290 V1 EN

Communication of current sampled values.

is the current sampling moment

Redundant communication channels

With redundant communication channels, as shown in figure 59, both channels are in

operation continuously but with one of them favoured as a primary channel.

Differential protection

en05000290.vsd

Relion red670