Operation Principle - ABB RELION REX640 Technical Manual

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Protection functions

in this document. The configuration can be written to the protection relay once the

mismatch is corrected.

Operation principle

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

corresponding parameter values are "On" and "Off".

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

in the diagram are explained in the next sections.

GUID-E9F31605-8D12-46B4-B504-7E0370258C27 V1 EN

Functional module diagram

Level detector 1

This module compares the phase currents (RMS value) to the Start value high setting.

The Operation mode setting can be used to select the "3-phase" or "1-phase" mode.

If in the "3-phase" mode all the phase current values are less than the value of the Start

value high setting, the condition is detected and an enable signal is sent to the timer.

This signal is disabled after one or several phase currents have exceeded the set Start

value high value of the element.

If in the "1-phase" mode any of the phase current values are less than the value of the

Start value high setting, the condition is detected and an enable signal is sent to the

timer. This signal is disabled after all the phase currents have exceeded the set Start

value high value of the element.

The protection relay does not accept the Start value to be smaller than

Current block value

Level detector 2

This is a low-current detection module that monitors the de-energized condition of the

protected object. The module compares the phase currents (RMS value) to the Start

value low setting. If all the phase current values are less than the Start value low

setting, a signal is sent to block the operation of the timer.

1MRS759142 C

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