Figure. 5.6.5. - 156. Example of the circuit breaker interrupting life operations.
Function is triggered from the circuit breaker open command output and it monitors the three phase
current values in the tripping/opening moment. The maximum interrupting life operations value per
each phase are calculated from these currents which is cumulatively deducted from the starting value
of the operations. It is possible to set up two separate alarm levels which are activated when the
interrupting life operations value is below the setting limit.
Trip contact setting de nes the output that triggers the current monitoring at breaker open command.
Outputs of the function are Alarm 1 and Alarm 2 signals. Setting parameters are static inputs for the
function which are changed only by user input in the setup phase of the function.
Inputs for the function are setting parameters and measured and pre-processed current magnitudes
and binary output signals. Function output signals can be used for direct IO controlling and also for
user logic programming. The function registers its operation into 12 last time-stamped registers and
also generates general time stamped ON/OFF events to the common event buffer from each of the two
output signal. Time stamp resolution is 1ms. Function provides also cumulative counters for Open
operations, Alarm 1 and Alarm 2 events. Operations left for each phase can be monitored also in the
function.
In the following gure the simpli ed function block diagram of the CBW function is presented.
Figure. 5.6.5. - 157. Simpli ed function block diagram of the CBW function.
AQ-T257
Instruction manual
Version: 2.00
279
© Arcteq Relays Ltd
