ABB RELION SMU615 Technical Manual page 173

1MRS758407 C
6.1.4.7 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 117: 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
WHMI 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.
6.1.4.8 Gas pressure supervision
The gas pressure supervision subfunction monitors the gas pressure inside the arc
chamber.
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 118: Functional module diagram for circuit breaker gas pressure alarm
The gas pressure is monitored through the binary input signals PRES_LO_IN and
PRES_ALM_IN.
SMU615
Technical Manual
Condition monitoring functions
Spring
173