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Erratic short-circuit detection

專(zhuān)利號(hào)
US11176806B1
公開(kāi)日期
2021-11-16
申請(qǐng)人
JOHNSON CONTROLS FIRE PROTECTION LP（US FL Boca Raton）
發(fā)明人
Alexandre Gouin; Nalin Ahangama Ralalage
IPC分類(lèi)
G08B29/04; G08B29/06; H02H3/24; G08B25/04
技術(shù)領(lǐng)域
isolator,controller,voltage,short,current,ptest,may,isolation,line,alert
地域： FL FL Boca Raton

摘要

A fire detection system may include isolation circuit having an isolation switch coupled with a system line of the fire detection system and configured to isolate a first side of the system line from a second side of the system line. The isolation circuit may also include a controller coupled with the isolation switch. The controller may be configured to detect repetitive, intermittent short circuit activity on the system line and control the isolation switch based on this activity.

說(shuō)明書(shū)

?0 0 μsec 1 ≤ 5 100 μsec ?6 ≤ 10 1 msec 11 ≤ 15 10 msec 16 ≤ 20 100 msec 21 ≤ 25 1 sec 26 ≤ 30 10 sec ≥31 100 sec

At step 436, if the option to give up on too many shorts is not enabled, then control proceeds to step 438 where the short circuit event is registered by incrementing RepShortCntr, which affects the length of the delay time OFF-Delay as discussed above. Thus the more short circuit events that occur close to each other, OFF-Delay is increased and the more time the isolator waits before reclosing the isolator.

On the other hand, if the option is enabled but the number of confirmed short circuits has not surpassed some predetermined threshold, (as determined in step 450), then again control proceeds to step 438, where the short circuit event is registered by incrementing the RepShortCntr counter. The Ptest is stopped (step 440) and the isolator is closed at step 442, allowing once again the two sides of the network loop to communicate.

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