Condition Monitoring; Cb Wear; Tcs1 - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
7.4.
7.4.1.
7.4.2.
96
Protection Relay
Technical Reference Manual, Standard Configurations
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Three-phase power and energy measurement, PQE
P3 (kW)
Q3 (kVAr)
Power factor DPF
Power factor PF
P3 demand (kW)
Q3 demand (kVAr)

Condition monitoring

CB wear

In the circuit-breaker wear function block CB wear, calculating the electrical wear
of the circuit breaker is based on the current in each phase before opening. The
breaker wear is calculated for each phase separately and when the accumulated
breaker wear has reached the setting value, the function block will issue an alarm
signal.
The function block uses a 16-point setting table
(Main menu\Cond.Monit.\CB wear\ Control settings) for the
current and the corresponding breaker wear value. The calculation is based on linear
interpolation using the table. Typically, the breaker wear increases in proportion to
the square of the current. However, the interpolation table solution provides a close
match and facilitates the configuration.
CB wear
OPEN ALARM
BINOPEN
BINCLOSE
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TCS1

The trip-circuit supervision function block TCS does not perform the supervision
itself but it is used as an aid for configuration. The functional part belongs mainly to
the self-supervision tasks of the PS_ card.
-999999...999999 kW
-999999...999999 kVAr
-1.00...1.00
-1.00...1.00
-999999...999999 kW
-999999...999999 kVAr
1MRS 751802-MUM