ABB RELION REX640 Technical Manual page 1366

Protection and control

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Table of Contents

Condition monitoring functions

Figure 778: Functional module diagram for calculating accumulative energy and

Accumulated energy calculator

This module calculates the accumulated energy I

The calculation is initiated with the POSCLOSE input opening events. It ends when

the RMS current becomes lower than the

Figure 779: Significance of the Difference Cor time setting

accumulate the energy from the time the main contact opens. If the setting is

positive, the calculation of energy starts after the auxiliary contact has opened and

when the delay is equal to the value set with the

the setting is negative, the calculation starts in advance by the correction time

before the auxiliary contact opens.

The accumulated energy outputs IPOW_A (_B, _C) are available in the monitored

data view on the LHMI or through tools via communications. The values can be reset

by setting the parameter

from WHMI or LHMI.

Alarm limit check

The IPOW_ALM alarm is activated when the accumulated energy exceeds the value

set with the

exceeds the limit value set with the

IPOW_LO output is activated.

Current exponent setting.

Difference Cor time setting is used instead of the auxiliary contact to

Alm Acc currents Pwr threshold setting. However, when the energy

Acc stop current setting value.

CB accum. currents power setting to true in the clear menu

LO Acc currents Pwr threshold setting, the

s]. The factor y is set with

Difference Cor time setting. When

Technical Manual

1MRS759142 F