Misali mai zama na shiga kuli?
Mi ce short-circuit Current?
Bayanin short circuit current
Short-circuit current shine karamin kudin da ke cikin gwamnatin kudin lokacin da yake faruwa na iya bayarwa bayan fase da fase ko bayan fase da hukumomin rani (ko line na tsakiyar rani) a lokacin gwiwa. Yadda za a iya zama da yawan kudin mafi yawa da ma'afukan kudin masu siffar. Ana iya zama ne a kan yadda da aka sautin kasa daga wurin short circuit zuwa matattaccen kudin.
Nau'o'in short circuit
Three-phase short circuit
Two-phase short circuit
Single to ground short circuit
Short circuit in both directions
Matukar kalkulaci
Don hana da darajinsa short circuit da kuma kammalawa yadda ake samun abin da aka yi.
Skenariyo na kalkulaci short-circuit
A lokacin da ake zabi tattalin kudin da kuma kayayyakin da suka taka kudin, ya kamata a duba kalmomin kudin short-circuit don haɗa mai kyauwa da kuma mai kyauwar jiki.
Zabi da kuma sauki wani tattalin inganci don kida koyarren short circuit fault.
Kada kwayoyin wiring mai gaba, yanayin gwiwa da kuma hanyoyin kudin mai kyau.
Haɓaka tattalin kudin gwamnati a matsayin short-circuit state mai karfi, kuma kammala darajinsa da aka yi a nan saboda short-circuit failure
Shaida na kalkulaci
Tambayata a fice cewa system yana da kabilar. A ba ake faruwa ta shi a nan user, ana iya haɓaka bus voltage na system. Wannan yana nufin cewa impidansi na kalkulaci yana da yawan mafi yawa da impidansi na system.
A lokacin da ake kalkula kudin short circuit a tattalin kudin da take da takaitar, ana iya duba kalmomin reactance na generator, transformer da reactor, amma ana iya haɓaka resistance. Don overhead lines da cables, ana iya duba resistance idan yana da yawan mafi yawa da 1/3 reactance, amma a baya ana iya haɓaka resistance da kuma duba reactance.
Formula na kalkulaci kudin short-circuit ko chart, suna a yi a kan shaida na kalkulaci three-phase short-circuit. Saboda kudin short-circuit single-phase ko two-phase yana da yawan mafi yawa da kudin three-phase short-circuit. Tattali da take da takaitar da zai iya kida kudin three-phase short-circuit zai iya kida kudin single-phase short-circuit ko two-phase short-circuit.
Manyan Parametar
Sd : three-phase short circuit capacity (MVA), short circuit capacity check switch breaking capacity.
Id : Effective value of three-phase short-circuit current cycle component, short circuit current check switch breaking current and thermal stability.
Ic : three-phase short circuit first cycle full current RMS, referred to as impulse current RMS check dynamic stability.
ic : three-phase short circuit first cycle full current peak, referred to as impulse current peak check dynamic stability.
x : Reactance (Ω)
Per unit value
A zabe reference capacity (Sjz) da kuma reference voltage (Ujz) don kalkulaci. Duka parametar a kalkulaci short-circuit an yi a kan ratio na reference quantity na parametar (relative to the reference quantity), wanda ake kira per unit value.
Kalkulaci per unit
Per unit capacity : S*=S/Sjz
Per unit voltage : U*=U/Ujz
Current per unit value : I*=I/Ijz
Formula for calculating three-phase short-circuit current of infinite capacity system
Per unit of short circuit current : Id*=1/x* (reciprocal of total reactance standard value)
Effective short circuit current : Id=Ijz*I*d=Ijz/x*(KA).
Effective impact current value : Ic=Id*√1+2(KC-1) 2(KA), where KC impact coefficient is 1.8, so Ic=1.52Id
Peak impulse current : ic=1.41*Id*KC=2.55Id(KA)
Abubuwan da za su iya haɓaka
Zabi da kuma haɓaka tattalin kudin daidai. Rated voltage na tattalin kudin yana da shi da rated voltage na line
Zabi da kuma haɓaka setting value na relay protection da rated current na melt daidai, kuma amfani da quick-break protection device
Samun lightning arresters a substation, kuma samun lightning arresters wajen transformers da kuma a line don kammala darajinsa da aka yi a nan saboda lightning damage
Hana da kwalitoci na overhead line construction da kuma hana da kwalitoci na line maintenance
Hana da kwalitoci na overhead line construction da kuma hana da kwalitoci na line maintenance
Hana da kwalitoci na management don kammala darajinsa da aka yi a nan saboda small animals da suka ciwo power distribution room da kuma climbing on the electrical equipment
Kawo kudin dust da suke da ita a kan tattalin kudin
Samun marker a kan wurin da cable ya ciwo
Operation and maintenance personnel na power system yana da kyau a yanayi procedures, kuma haɓaka rules and regulations, kuma haɓaka tattalin kudin daidai
