ABB RELION REX640 Technical Manual page 1378

Protection and control

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Table of Contents

Condition monitoring functions

INA_DAYS to certain value with

will reset to zero when there is change in auxiliary contact.

When the INA_DAYS exceeds the limit value defined with the

setting, the MON_AL alarm is activated. The time during the day when alarm is

forwarded can be set with the

MON_ALM can be blocked by activating the binary input BLOCK.

Operation counter

This module calculates the number of operation cycles which means the

combination of opening and closing operation of switch. The operation counter

is increased on each opening operation of the switch.

The number of operations NO_OPR is available in the monitored data view. The

former operation counter value can be taken into use by writing the value to the

Counter initial Val parameter setting and can be cleared by setting the parameter

Operation counter in the clear menu from WHMI or LHMI.

The OPR_ALM operation warning is generated when the number of operations

exceeds the value set with the

number of operations increases further and exceeds the limit value set with the

Lockout Op number setting, the OPR_LO output is activated.

The binary outputs OPR_ALM and OPR_LO are deactivated when the BLOCK input is

Contact travel time

This module calculates the contact travel time for the closing and opening

operation. the travel time can be calculated in two different ways based on setting

Travel time Clc mode.

When setting

the earthing switch or disconnector is calculated from the time between auxiliary

contacts' state change. The opening travel time is measured between the opening

of the POSCLOSE auxiliary contact and the closing of the POSOPEN auxiliary

contact. The closing travel time is measured between the opening of the POSOPEN

auxiliary contact and the closing of the POSCLOSE auxiliary contact.

Ini inactive days setting. The inactive days INA_DAYS

Inactive Alm hours parameter. The warning signal

Alarm Op number threshold setting. However, if the

Travel time Clc mode is "From Pos to Pos", the contact travel time of

1MRS759142 F

Inactive Alm days

Technical Manual