Remaining Life Of Circuit Breaker - ABB Relion SMU615 Technical Manual

1MRS758407 B
6.1.4.6
SMU615
Technical Manual
exceeds the limit value set with the LO Acc currents Pwr threshold setting, the
IPOW_LO output is activated.
The IPOW_ALM and IPOW_LO outputs can be blocked by activating the binary input
BLOCK.

Remaining life of circuit breaker

Every time the breaker operates, the life of the circuit breaker reduces due to wearing.
The wearing in the breaker depends on the tripping current, and the remaining life of
the breaker is estimated from the circuit breaker trip curve provided by the
manufacturer. The remaining life is decremented at least with one when the circuit
breaker is opened.
The operation of the remaining life of the circuit breaker subfunction can be described
with a module diagram. All the modules in the diagram are explained in the next
sections.
A071111 V2 EN
Figure 114: Functional module diagram for estimating the life of the circuit
breaker
Circuit breaker life estimator
The circuit breaker life estimator module calculates the remaining life of the circuit
breaker. If the tripping current is less than the rated operating current set with the
Rated Op current setting, the remaining operation of the breaker reduces by one
operation. If the tripping current is more than the rated fault current set with the Rated
fault current setting, the possible operations are zero. The remaining life of the
tripping current in between these two values is calculated based on the trip curve given
by the manufacturer. The Op number rated and Op number fault parameters set the
number of operations the breaker can perform at the rated current and at the rated fault
current, respectively.
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.
Clearing CB wear values also resets the operation counter.
Condition monitoring functions
Section 6
161