Application - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

GUID-E39F2BFC-3124-4C9F-877F-6C45B478E80E V1 EN

Example of an internally connected network

Externally connected

A network where both Bus3 and Bus4 are connected to the grid across CB1 is

considered an externally connected network.

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Example of an externally connected network

The number of sources active in the voltage and frequency matching is shared to

sources via the corresponding output signal ASC_SRC1_DAT...ASC_SRC8_DAT.

The binary input BLOCK can be used to block the function. The activation of the

BLOCK input deactivates all binary outputs and resets the internal timers.

Application

A circuit breaker is used to connect two different power networks. It is essential to

ensure that these power networks are synchronized before closing the CB, otherwise

it may lead to disturbances in the power system, causing stress and damage to the

connected equipment.

The synchronization of any bus coupler or tie feeder is not feasible if the voltage and

frequency differences across the circuit breaker are not within the allowed limits. In

this case, the sources which are part of the power network connected across this bus

Control functions

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