ABB RELION REX640 Technical Manual page 1368

Condition monitoring functions
The remaining life is calculated separately for all three phases and it is available as
a monitored data value CB_LIFE_A (_B,_C). The values can be cleared by setting the
parameter CB wear values in the clear menu from WHMI or LHMI.
Alarm limit check
When the remaining life of any phase drops below the
setting, the corresponding circuit breaker life alarm CB_LIFE_ALM is activated.
It is possible to deactivate the CB_LIFE_ALM alarm signal by activating the binary
input BLOCK. The old circuit breaker operation counter value can be taken into use
by writing the value to the
the clear menu from WHMI or LHMI.
7.1.5.7 Circuit breaker spring-charged indication
The circuit breaker spring-charged indication subfunction calculates the spring
charging time.
The operation of the subfunction can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
Figure 781: Functional module diagram for circuit breaker spring-charged indication
and alarm
Spring charge time measurement
Two binary inputs, SPR_CHR_ST and SPR_CHR, indicate spring charging started
and spring charged, respectively. The spring-charging time is calculated from the
difference of these two signal timings.
The spring charging time T_SPR_CHR is available in the monitored data view on the
LHMI or through tools via communications.
Alarm limit check
If the time taken by the spring to charge is more than the value set with the
charge time setting, the subfunction generates the SPR_CHR_ALM alarm.
It is possible to block the SPR_CHR_ALM alarm signal by activating the BLOCK binary
input.
7.1.5.8 Gas pressure supervision
The gas pressure supervision subfunction monitors the gas pressure inside the arc
chamber.
1368
CB wear values also resets the operation counter.
Clearing
Initial CB Rmn life parameter and resetting the value via
1MRS759142 F
Life alarm level threshold
Technical Manual
Spring
REX640