Daga Yana Da Take Kusa Maza Contactors? Yana Da Zan Iya Kula Da Inganci Ko Kuma Kula Da Hanyar Tsakiyar Rago Daga Baya

Akwai amfani da konsulta na biyu da kusa da abubuwan da ke bukata da haka a cikin amfani har zuwa, musamman wajen ayyuka masu ma'ana kamar tushen karamin sarki da mota mai elektriki a kasashen kayan kwalliya.

Konsulta na biyu da kusa da kombinasiya ta kofin (F-C) yana iya kawo alama masu motoci da kasa ga 12 kV. Amma, kawalolin kasa suna da muhimmanci a gaba-gaban mutane da duk abubuwan, musamman transformers. Don waɗannan mutane, ana ba da konsultoci da sauyi masu kasa don haka cewa konsulta bai kusa da zaman lafiya ba idan an kasa rarrabe na juna.

Konsultoci masu kasa suka da tsari daban-daban da konsultoci masu lalle da kusa. Amma, ya kunshi, kafin koyar da koyar da main coil mai lalle da kusa don kasa konsultoci, konsultoci masu kasa suke amfani da kasa mai sauƙi don kasa. A hakuri, konsultoci masu kasa suka hada da medium-voltage circuit breakers. Amma, ya kamata a duba cewa akwai yanayi masu mafi muhimmanci a nan bayan konsultoci da circuit breakers.

Muhimmin Yadda Kake Da Al'amuran Kawalolin

Idan konsulta mai lalle da kusa an kasa ne, zai kasa har zuwa lokacin da main coil mai lalle da kusa. Akwai karin lokacin, control power supply masu main coil circuit shi ne control power transformer, wanda yana da muhimmanci a cikin kowane kawalin. Saboda haka, don mutane da ke motoci, idan rarrabe na juna an kasa, zai kusa da zaman lafiya, don haka zai kara damar da motoci.

Duk da haka, konsultoci masu kasa zai kasa har zuwa lokacin da rarrabe na juna an kasa. Wannan ita ce mafi muhimmanci a nan bayan mutane da ke bukata suka kasa otomatiki idan an sake kara rarrabe na juna, kamar transformers na tushen karamin sarki.

Konsultoci masu lalle da kusa zai kusa da zaman lafiya idan kofin a main coil control circuit zai kusa. Amma, konsultoci masu kasa zai sake kasa idan kofin a lalle da kusa zai kasa, don haka zai kusa da zaman lafiya. Saboda haka, al'amuran kawalolin da ke bukata suka kasa konsultoci masu kasa yana da haske da al'amuran kawalolin da ke bukata medium-voltage circuit breakers.

Konsultoci masu kasa sun bukata control power supply mai inganci don tripping. Ana bukata direct current (battery) power supply, amma idan kawai control power supply shi ne control power transformer da aka kafa da primary voltage source, alternating current capacitor tripping device yana da kyau a amfani da shi.

Circuit na kasa ya kamata a yi amfani da momentary contact buttons don haka cewa main coil zai lalle da kusa ne kawai lokacin da kasa. Duk da haka, tripping (latch release) circuit ya kamata a yi amfani da momentary contact buttons. Don kawalolin otomatiki, ana bukata normally open contact a gaba-gaban tripping (latch release) circuit, kuma normally closed contact daga kawalolin za a gaba-gaban circuit na kasa. Muhimmancin normally closed relay contact a cikin circuit na kasa shine cewa main coil circuit zai kusa da zaman lafiya a lokacin da tripping. Yana da kyau a gina lockout (86) relay function, ko kuma a gina ta ta hanyar 86 function a nan multi-functional microprocessor relays ko kuma a gina ta ta hanyar lockout relay mai suna.

Muhimmanci, circuit na kasa na gineba ba ya kamata a gina holding contacts a cikin circuit na kasa. Konsultoci masu kasa suna da hakan da konsultoci masu lalle da kusa, kuma ana ba da sauyi masu kasa. Idan main coil circuit zai lalle da kasa har zuwa lokacin da kasa, konsulta zai kasa har zuwa lokacin da kasa, hatta idan tripping latch an kasa.

Abubuwan da ake magana a kan lokacin da ya kamata a gina bayan fault interruption da kasa na gineba suna da wahala. Akwai masu karatu suna magana cewa ya kamata kudaciyoyi ga kashi har zuwa lokacin da kasa. Akwai masu karatu suna magana cewa ya kamata kudaciyoyi ga kashi har zuwa lokacin da kasa.

Muhimmin Short-Circuit da Overload

Konsultoci da ake amfani da su don kasa transformers suna da yanayi da konsultoci da ake amfani da su don kasa motoci kawai a tsari na fuses. Fuses da ake amfani da su don kasa motoci su ne Class M fuses, wadannan suka da muhimmanci masu al'amuran da ke bukata wa motoci. Don transformers, fuses ya kamata su ne Class T fuses, wadannan suka da muhimmanci masu al'amuran da ke bukata wa transformers.

Konsultoci babban fuses suna da iya kasa da kasa da kasa. Saboda haka, konsultoci suna bukata a yi amfani da su tare da fuses. Kombinasiya na konsulta (wanda yake kasa normal load current da moderate overload current) da fuse (wanda yake kasa currents da suka fi kasa da iya kasa na konsulta) yana bayar da iya kasa overcurrent da short-circuit interrupting capacity.

Overcurrent relays ya kamata a yi amfani don kawalolin moderate overload currents, don haka zai kara damar da operation da ba daidai ba. Wannan protection ya kamata a gina tare da continuous current-carrying capacity na fuse-contactor combination. Saboda fuses suna da heat, ba wasu ba suke da shakka a gina fuses da suka da shakka da kasa. Saboda haka, overcurrent relays suna bayar da overload protection don transformers da kuma fuse-contactor combination. Wannan yana da kyau saboda muhimmancin fuse shine short-circuit protection, ba overload protection ba.

Single-Phase Protection

Tushen kawalolin overload masu zamani suna da muhimmanci masu protection function don kasa motor otomatiki idan kofin kasa na juna. Amma, don non-motor feeders, wannan "single-phase protection" ba ya kamata ko daidai. Misali, capacitor ko lighting loads ba suka da damar da single-phase conditions. Ba haka, masu amfani ya kamata a duba cewa single-phase protection ya kamata. Yanayin da ake amfani da shi a nan shine cewa ake amfani da fuse trip accessory, wanda yake kasa da plunger a cikin fuse. Ta haka, idan any single primary current-limiting fuse an kasa, indicator plunger a cikin fuse zai kasa trip lever, don haka konsulta zai kasa.

Muhimmin Iyakokin Amfani

Konsultoci masu kasa suna da muhimmancin amfani daban-daban da konsultoci masu lalle da kusa. Duk da cewa circuit breakers, konsultoci suna da muhimmancin amfani masu kasa, da electrical operations 200,000. Tsarin transformers da ake bukata a kasa konsultoci, yana da kyau a gina fuses (especially at 7.2 kV) da kuma continuous current capacity na konsulta.

Konsultoci suna da muhimmancin amfani da energy control power requirements mai tsarki. Saboda haka, closing da opening speeds masu suka da kyau. Closing time na 40 ms for 400 A and 70 ms for 720 A, while the opening time is 90 ms for 400 A and 35 ms for 720 A. Duk da cewa wadannan lokaci suka da kyau da lokacin da circuit breakers, ba suka bukata al'amuran kawalolin ko kuma system operating procedures. Latched contactors suna da kyau a gina a matsayin design da medium-voltage controllers, don haka zai kara transition sections da kuma large switchgear enclosures da ke bukata circuit breakers. Saboda konsultoci masu kasa suna amfani da fuses don short-circuit protection, fuses zai kasa idan an kasa severe fault. Idan wannan an samu, downtime da ke bukata don kasa fuses yana da kyau da kasa circuit breakers. Amma, tarihin yadda ake amfani da shi sun nuna cewa severe faults suka da kyau, saboda haka ba za a iya zama batu ba.

Bayanin

Konsultoci suna da muhimmancin amfani don kasa transformers da kuma non-motor loads da shekarun, kuma amfani masu suka da kyau a nan bayan shekarun. Amfani masu konsultoci masu kasa yana da muhimmanci a nan bayan transformers suka kasa da medium-voltage contactors.