ABB RELION 620 Series Technical Manual page 576

Section 6
Supervision functions
6.1.4.7
570
Clearing CB wear values also resets the operation counter.
Alarm limit check
When the remaining life of any phase drops below the Life alarm level threshold 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 Initial CB Rmn life parameter and resetting the value via the clear menu
from WHMI or LHMI.
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.
A071112 V3 EN
Figure 286: 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 Spring charge
time setting, the subfunction generates the SPR_CHR_ALM alarm.
1MAC504801-IB E
620 series ANSI
Technical Manual