Basler BE1-BPR, Инструкция по эксплуатации

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BE1-BPR Application 2-9
Figure 2-12. Breaker Arc Detector Circuits
Figure 2-13. Breaker Resistor Protection Circuits
The breaker arc detector logic employed in the preprogrammed schemes logically ANDs the MAF fault
detector (F3) and the 52b input (I1) to start a delay timer (T5). Timer delay can be as long as 60 seconds.
The timer delay should be set to 1.5 to 2.0 times the MAF window time. Both the fault detector and breaker
status must stay unchanged for the entire length of the time delay or the timer is reset. If the timer does time
out, the breaker arc output (O4) closes. This output could be used to reclose the breaker, extinguish the arc,
prevent secondary circuit switcher failure, externally parallel the BFO, or to give an alarm.
Breaker Resistor Protection
Breaker resistor protection is a BE1-BPR relay feature that monitors the number of times a breaker opening
resistor has been used and the amount of elapsed time between operations. If additional openings
(operations) would exceed the resistor maximum power rating, the breaker resistor protection feature
operates output 13 (O13), which can be used as a block reclose output. Breaker resistors are typically rated
to handle X operations (i.e. - 5 operations) in T time (i.e. - 15 minutes cooling time for each operation). The
resistor protection is a self contained module (Figure 2-9) that counts and time tags each operation then
decrements the count T time after it occurred. If the count reaches the limit, an internal output becomes
TRUE. In the enhanced logic schemes, the programmable logic output (O13) drives the block reclose output.
(If a reclosing function is enabled, programmable logic output (O13) is driven by the reclose output and the
block reclose signal is internally ORed with the defined reclose WAIT logic input.) This output is intended
to block reclosing until the count has dropped below the limit. This action allows the resistors to cool
sufficiently and protects the opening resistors.
Refer to Output Contacts in this section for additional information if your requirements call for a NC contact
for this purpose. Also see Section 4, Functional Description, for a detailed functional description on how to
program the resistor protection function module.