ABB RELION REX640 Technical Manual page 663

Protection and control

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1MRS759142 F

Figure 374: Operation logic of the direct intertrip function

The start and operate signals are provided separately for the low and high stages,

and in the local and remote.

Blocking functionality

There are two independent inputs that can be used for blocking the function: BLOCK

and BLOCK_LS. The difference between these inputs is that BLOCK_LS (when TRUE)

blocks only the stabilized low stage leaving the instantaneous high stage operative.

BLOCK (when TRUE) blocks both stages and also the PRO_ACTIVE output is updated

according to the BLOCK input status, as described in the Fail safe function chapter.

The BLOCK and BLOCK_LS input statuses affect only the behavior of the local

protection instance. When a line differential protection stage (stabilized low

or instantaneous high) is blocked, also the received remote signals related to

the corresponding stage are ignored (received direct inter-trip signals from the

remote end). The binary signal transfer functionality should therefore be used for

Technical Manual

Protection functions