Operation Principle - ABB RELION REX640 Technical Manual

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Basic functions

Operation principle

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "on" and "off". When the Operation setting is

changed from "off" to "on", the monitored variable TAG_SOURCE is set to "None"

and saved to a nonvolatile memory.

When the Operation setting is "on" and a reboot occurs, the TAG_SOURCE variable

is read from the nonvolatile memory.

The operation of HLTGAPC can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

Remote tag mode

GUID-E3CC15C9-6507-4942-8DFF-E7B0547D9EE7 V1 EN

Functional module diagram

Local tag is activated or deactivated on rising edge detection of TAG_ON_OFF input

or with a local command from the LHMI when the protection relay is in local mode.

If a rising edge tag is detected locally, and the status of the nonvolatile variable

TAG_SOURCE is "None", the tag is locally activated. TAG_SOURCE changes to

"Local" while TAG_ON is set to TRUE and TAG_OFF to FALSE.

If a rising edge tag is detected locally, and the status of TAG_SOURCE is "Local", the

tag is locally deactivated. TAG_SOURCE changes to "None" while TAG_ON is set to

FALSE and TAG_OFF to TRUE.

When TAG_SOURCE is "Remote" and the Remote tag mode setting is "Untag Rem

only", all local commands are prohibited. However, when the Remote tag mode

setting is "Untag Loc or Rem", deactivation can be done locally.

Remote tag is activated or deactivated on rising edge detection through a

communication channel in remote mode.

1MRS759142 C

Technical Manual

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