Must DC circuit breakers always be bipolar? Amsa: Ya kamata a yi amfani da muhimmiyar tauri na kawar hanyoyi na tsakiyar DC? A halin yanzu, ana iya amfani da muhimmiyar tauri na kawar hanyoyi na tsakiyar DC da dama, amma ba a zama na bi da shi ba cewa ya kamata a yi amfani da ita. Wannan ya gina ne domin samun ingantaccen bayanai game da yanayin da ake bukatar da shi, kuma abubuwan da za su iya haifar da aiki.

Don samu 24V switch-mode power supply branch, na yi amfani da single-pole DC circuit breaker, wanda an yi equipotential bonding (saboda haka, ina iya amfani da AC breakers kamar shugaban—babu inganci a cikin arc-extinguishing performance, amma yana da kyau a kan arc a kan few-amp low-current short circuit?).

A lokacin da ake yi design review, wani malam ya ce cewa DC circuit breakers ya zama bipolar, saboda DC na da positive da negative poles, ba koyar AC!

Ina nuna—wanda ana gina wannan regulation? Ba ni, ina nuna, mafi yawan manufacturers suna yi single-pole versions? Me dace da muhimmancin da take da switching of the negative pole? Daga cikin bayanan da aka samu, idan ka yi reverse connection ta DC breaker, yadda ake gina impact ita ce kawai a kan arc-extinguishing performance. Kuma idan na bayar cewa negative pole na yi equipotential bonding, wani malam na ce cewa "equipotential" ba ya gina da DC systems—kawai a kan AC. Ana da tsari? Ni da wahala—wadannan sensors masu sauran suna nuna power supply negative terminal da "GND" symbol.

Don PE (protective earth) wire mai kula a kan electrical cabinet, na yi amfani da PE green-yellow terminal a kan mounting rail, amma suka ce cewa bai da za ake daidai ko za a yi connect to a dedicated grounding busbar. Bana da kyau a duba malaman da ake magana, musamman waɗannan daga maritime field—marine applications na da muhimmanci, ba?

Rai User A:
Yana da kyau a yi da dalilai. Arc extinction a kan DC ana da wahalarwa game da AC, amma a kan low-voltage circuits, ba zai iya da kyau. Bana da kyau, idan bana da critical application, single-pole breaker, idan yake da shiga da ba zai canza contact welding, yana da kyau. Marine electrical systems na da muhimmanci a kan fire and safety. Saboda haka, safety ya zama abubuwan da za su dauce.

Rai User B:
A wasu halayansu, za su iya da rai masu kyau. Muhimmin wannan shine don haka cewa za su iya disconnect both poles. Idan 0V ya zama grounded, zai iya kasance risks of high-voltage intrusion, wanda zai iya haɗaƙa.

Rai User C:
Ina nuna cewa na yi amfani da PE terminal a kan rail, amma suka ce cewa bai da za ake daidai ko za a yi connect to a grounding busbar. Ina fahimta—wannan shine code requirement don haka cewa za a yi reliable and safe grounding.

Rai User D:
Ba a tabbataccen standards da suka fi sani. Ina bayar cewa duka conductor da ke da current ko voltage, ya zama controllable and interruptible. Standards da suka fi sani ba na da kyau a yanzu. Technology ya zama, kuma standards ya zama.

Rai User E:
Don specified DC loads, polarity (+/-) na da shaida—reversing connections zai iya haɗaƙa. Ba na son in ba da equipotential bonding, amma na yi amfani da American machine inda suka ce cewa PLC ba ta bayar signals, wanda yana haɗaƙa, kuma ya kai equipment department head. Ya yi multimeter—one probe on the chassis, one on the terminal—and concluded to "check the downstream side" (it turned out the software had disabled it). An haɗe problem da equipotential bonding. Saboda haka, idan kana da marine applications, kara da advice da malaman.

Rai User F:
Idan kana yi amfani da bipolar breaker, yana nufin cewa negative terminal bai da za ake grounded—i.e., isolated system. A wasu halayansu, positive-to-ground short bai da za ake cause immediate trip. Method of grounding the negative pole and using equipotential bonding bai da za ake da kyau a duk halayansu. Don equipment da zai iya stop immediately, wannan method zai iya taimakawa wajen locate fault points and resolve issues. Amma, bai da za ake da kyau a kan medical or lifting equipment. Kuma malaman ba su da alama—su da muhimmanci a kan wasu halayansu. Idan kana da ilimi mai zurfi a kan wasu halayansu, zaka iya zuwa malami.

Idan kana da suggestions ko insights, zaka iya share and discuss!