Measuring Modes - ABB RELION REX640 Technical Manual

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1MRS759142 C

Technical Manual

GUID-785402D9-3DC4-46C6-93CE-62CA1C0CA745 V2 EN

Functional module diagram

Level detector

This module compares the differential current I_A to the set Start value. The timer

module is activated if the differential current exceeds the value set in the Start value

The time characteristic is according to DT. When the alarm timer reaches the value set

by Alarm delay time, the ALARM output is activated. If the fault disappears before the

module generates an alarm signal, the reset timer is activated. If the reset timer reaches

the value set by Reset delay time, the alarm timer resets. The activation of the BLOCK

signal resets the Timer and deactivates the ALARM output.

Lockout logic

HZCCxSPVC is provided with the possibility to activate a lockout for the ALARM

output depending on the Alarm output mode setting. In the "Lockout" mode, the

ALARM must be reset manually from the LHMI Clear menu after checking the CT

secondary circuit. In the "Non-latched" mode, the ALARM output functions normally,

that is, it resets as soon as the fault is cleared.

Measuring modes

The function operates on two alternative measurement modes, DFT and Peak-to-

Peak. The measurement mode is selected using the Measurement mode setting.

Supervision functions

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