Misalci da Dukkada Karamin Gini?

Matsayin Wani na Aikatako na Arc?

Takardun Aikatako na Arc

Aikatako na arc yana nufin prosesi na gada shi da duka tsari mai tsari mai tsari da ke faru a lokacin da masu takarda suka zama.

Huruwa na Aikatako na Arc

Akawo biyu ne a cikinsu: hura na takara mai kadan, wanda ke sa takara don kuma zama zero current, da hura na takara mai haske, wanda ke amfani da tushen zero point ta AC current.

Voltage na Restriking

Voltage na restriking shine voltage a kan takarda bayan an gada arc.

Takardun Energy Balance

Idan masu takarda suna bukatar zuwa don zama, voltage na restriking ya zama zero, saboda haka bai kasance heat. Idan suka zama daidai, takara ya zama infinite, kuma bai kasance heat. Saboda haka, maximum heat ya kasance a kan wannan wurare. Takardun energy balance ce idan heat dissipation a kan takarda ya fiye da heat generation, za a iya gada arc tare da kyau, karfin zuwa, da kuma kusa arc.

Takardun Voltage Race

Arc yana nuna saboda ionization na gap a kan takarda bayan circuit breaker. Saboda haka, takara a kansu yana zama daidai, ya’ni idan takarda suka zama daidai, da kuma idan takarda suka fitar da zama, takara ya faru. Idan muna kasa ions a kansu, ya’ni idan muna sake koyar da su don neutral molecules ko in kunshi insulation a kansu, muna iya gada arc. Ionization a zero current yana nuna saboda voltages na restriking.

Za a bayyana expression na restriking voltage. Don loss-less ko ideal system muna da,

A nan, v = restriking voltage.

V = value of voltage at the instant of interruption.

L and C are series inductor and shunt capacitance up to fault point.

Saboda haka daga abin da aka bayyana muna neman cewa, lower the value of product of L and C, higher the value of restriking voltage.

The variation of v versus time is plotted below:

Idan muna duba practical system, ko in yi assalama fina loss a cikin system. A nan, restriking voltage ya zama damped out saboda presence of some finite resistance. A nan ita ce in yi assalama cewa, current lags behind the voltage by an angle (measured in degrees) of 90. Amma a cikin practical situation angle may varies depending upon time in cycle at which the fault is occurred.

Ina duba effect of arc voltage, if arc voltage is included in the system, there is an increment in the restriking voltage. However this is offset by another effect of an arc voltage which opposes the current flow and making change in the phase of current, thus bringing it more into phase with the applied voltages. Hence the current is not at its peak value when voltage passes through zero value.

Rate of Rise of Restriking Voltage (RRRV)

It is defined as the ratio of peak value of restriking voltage to time taken to reach to peak value. It is one of the most important parameter as if the rate at which the dielectric strength developed between the contacts is greater than RRRV, and then the arc will be extinguishes.