ABB RELION REX640 Technical Manual page 1377

Protection and control

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1MRS759142 F

Figure 785: Functional module diagram

Switch status

This module monitors the position of the earthing switch or disconnector, that is,

whether the switch is in an open, closed, intermediate or faulty position.

The OPENPOS output is activated when the auxiliary input contact POSCLOSE input is

FALSE and the POSOPEN input is TRUE. The CLOSEPOS output is activated when the

POSOPEN input is FALSE and the

The INVALIDPOS output is activated when both auxiliary contacts have the same

value, that is, both are in the same logical level.

Inactivity monitoring

The purpose of the inactivity monitoring is to indicate if the earthing switch or

disconnector has not been operated for a long time.

This module calculates the number of days the earthing switch or disconnector has

remained inactive, that is, has stayed in the same open, closed and intermediate

or faulty state. The calculation is done by monitoring the states of the POSOPEN,

POSCLOSE auxiliary contacts. The inactive days INA_DAYS is available in the

monitored data view. For relay retrofit installations, it is possible to initialize

Technical Manual

TRV_T_OP_ALM

TRV_T_CL_ALM

POSCLOSE input is TRUE.

Condition monitoring functions