Muhimmiyar Tasharadda A Kan Zabinta Da Turukan Farkon Kusurbin Kirkiyya a Makarantun Siffar Dukkana

Maimaita masu gajarta, kuma ake kira "maimaita masu gajarta" ko "maimaita masu gajarta", suka yi aiki tsakanin da ba ake shiga zuba ba a cikin harkokin gwamnati na yara. Idan an samu nasarorin harkokin gwamnati, za a yi abin da ya fi yawa. Daga baya, ana kategorize su daga ma'ana ta abincin zuba zuwa oil-immersed da dry-type types; daga baya, ana iya kiman maimaita masu gajarta uku ko fadada.

Maimaita masu gajarta yana taka wani wurin mai zurfi don lagalga grounding resistor. Idan an samu nasarorin harkokin gwamnati, ya ba da takardun da ya fi yawa ga positive- da negative-sequence currents amma ya ba da takardun da ya fi yawa ga zero-sequence current, don haka ya tabbatar da aiki daidai na ground-fault protection. Zabubbukan da sahihi na maimaita masu gajarta yana da muhimmanci sosai don kafin kwarshar harkokin gwamnati, doke electromagnetic resonant overvoltages, da kuma tabbatar da aiki daidai da kalmomin gwamnati.

Zabubbukan da sahihi na maimaita masu gajarta ya kamata a yi aiki da kula da wannan ma'aikatar teknikal: type, rated capacity, frequency, voltage and current ratings, insulation level, temperature rise coefficient, da overload capability. Ana bukata a duba yanayin da ke ciki, ciki da ambient temperature, altitude, temperature variation, pollution severity, seismic intensity, wind speed, da humidity.

Idan an samu zuba neutral point da ake iya haɗa, ya kamata a kunna maimaita masu gajarta fadada; idan ba haka, ya kamata a kunna maimaita masu gajarta uku.

Zabubbukan da sahihi na Capacity na Maimaita Masu Gajarta

Zabubbukan da sahihi na capacity na maimaita masu gajarta yana da muhimmanci sosai don type, siffofin aikinsu da aka laga zuwa neutral point, da kuma in ba ake shiga zuba ba a cikin secondary-side load. Koyaya, ya ba a yi kula da margin da ya fi yawa a cikin hasashen capacity na aikinsu (misali, arc suppression coil), saboda haka ba a kamata a yi additional derating ko safety factor ba a cikin zabubbukan.

A cikin photovoltaic power stations, an samu secondary side na maimaita masu gajarta don aikin kungiyoyin. Saboda haka, manufar taka bayyana kamar yadda ake cikakken capacity na maimaita masu gajarta idan an samu secondary load.

A kan hakan, capacity na maimaita masu gajarta yana da muhimmanci sosai don capacity na arc suppression coil da aka laga zuwa neutral point da kuma capacity na secondary load. An yi hasashen da ake yi da 2-hour rated duration equivalent to the arc suppression coil’s capacity. Don aikinsu da muhimmanci, an kamata a yi hasashen da ake yi da continuous operating time. An yi hasashen da ake yi da reactive power (Qₓ) don arc suppression coil, da kuma active power (Pf) da reactive power (Qf) don secondary load. An yi hasashen da ake yi da formula:

Idan an yi ground fault protection based on the reverse-direction active component of zero-sequence current, an kamata a kunna grounding resistor da value da ya danganta a primary ko secondary side na arc suppression coil don yin daidaita da accuracy na ground protection. Idan an yi amfani da wannan resistor, ya ba a yi amfani da active power a lokacin da ake yi aiki, amma an yi amfani da shi a lokacin da ya fi yawa kadan da kuma ya ba a yi amfani da shi sosai; saboda haka, ba a kamata a yi additional capacity increase for the grounding transformer ba.