Prinsip Kerja dan Jenis-jenis Rel Arus Lebihan

A cikin over current relay ko kuma o/c relay, abu da ya fi yin shi ne kawai karama. Akwai karama da ke yi a kan relay, ba a tabbas voltage coil ko wasu muhimman abubuwa da suka bukata don samun protective relay.

Tsunanka Aiki na Over Current Relay

A cikin over current relay, za a iya samun karama. Idan karamar daidai ta fitar da wannan karama, alama masu mafi karfi da aka sanya daga karamar tana zama babban da kafin ya sa shi. Amma idan karamar tana zama, alaman masu mafi karfi tana zama mafi yawa, kuma bayan baya mai tsabta, alaman masu mafi karfi tana haɗa da alaman da suke sa shi. Saboda haka, abu da ke yi a kan relay tana fara zuwa wajen gada takamunka. Duk da cewa akwai types of overcurrent relays, amma tsunanka aiki na overcurrent relay tana da ma'ana a cikin duk.

Abubuwan Over Current Relay

Duk da lokacin da ake yi aiki, akwai types of Over Current relays, kamar:

1. Instantaneous over current relay.

2. Definite time over current relay.

3. Inverse time over current relay.

Inverse time over current relay ko kuma inverse OC relay tana da faɗa a cikin inverse definite minimum time (IDMT), very inverse time, extremely inverse time over current relay ko kuma OC relay.

Instantaneous Over Current Relay

Tsunanka aiki da kimiyya na instantaneous over current relay tana da ma'ana.
Akwai karama da ke yi a kan magnetic core. Karama da ke yi a kan iron piece tana da hinge support da restraining spring a cikin relay, idan ba a kasance karama daidai a karamar, NO contacts tana daɗe. Idan karamar tana zama, alaman masu mafi karfi tana zama mafi yawa, kuma iron piece tana haɗa da magnetic core, kuma NO contacts tana gada.

Na nuna karamar da ke yi a kan relay coil a cikin pickup setting current. Ana kiran wannan relay a matsayin instantaneous over current relay, saboda idan karamar tana zama, relay tana fara zuwa wajen gada takamunka. Ba a tabbas da lokacin da take daɗe, amma akwai lokacin da ake yi a cikin aiki. A cikin aiki, lokacin da take daɗe tana da mutane daɗinsu.

Definite Time Over Current Relay

A cikin wannan relay, ana iya samun lokacin da ake yi a cikin aiki bayan karamar tana zama. A cikin definite time overcurrent relay, ana iya canza lokacin da ake yi a cikin aiki bayan karamar tana zama. Saboda haka, akwai lokacin da ake yi a cikin aiki da kuma karamar da ke yi a kan pickup.

Inverse Time Over Current Relay

Inverse time tana da ma'ana a cikin wasu induction type rotating device. Idan karamar tana zama, speed of rotation tana zama mafi yawa. Yana nufin cewa lokacin da ake yi a cikin aiki tana zama mafi yawa idan karamar tana zama. Wannan ma'ana tana da ma'ana a cikin overcurrent protection. Idan fault tana zama mafi yawa, za a iya gada shi mafi yawa. Duk da cewa inverse time tana da ma'ana a cikin electromechanical induction disc relay, ana iya samun shi a cikin microprocessor-based relay a cikin programming.

Inverse Definite Minimum Time Over Current Relay ko IDMT O/C Relay

Ba a zama da a iya samun ideal inverse time characteristics a cikin overcurrent relay. Idan karamar tana zama, secondary current of the current transformer tana zama mafi yawa. Secondary current tana zama a kan relay current coil. Amma idan CT tana zama saturated, ba zan iya samun proportional increase of CT secondary current a cikin karamar tana zama mafi yawa. Duk da cewa, inverse time relay tana da ma'ana a cikin trick value to certain range of faulty level. Amma idan fault tana zama mafi yawa, CT tana zama saturated, kuma relay current ba zan iya zama mafi yawa. Saboda haka, lokacin da ake yi a cikin aiki tana da ma'ana a cikin initial part, kuma tana zama da minimum operating time. Saboda haka, ana kiran wannan relay a matsayin inverse definite minimum time over current relay ko kuma IDMT relay.

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