Tambayar Gwadon Farkon Maimaituka a Wani Yawancin Tsakiyar Riga Daɗi a Ƙasar Ta Hanyar Zafiya

1 Tattalin Nau'in

A cikin tattaunuka masu sauran, tatuwar da suka kula mafi yawan abubuwa biyu: tattalin sararin sararin dogon da kuma kananan kuliya a tsakiyar tsakiya don inganta. Duk da cewa tattalin hankali suna da muhimmanci a cikin tattaunuka, wadannan tattalin hankali suna iya haifar da rayuwarsa na tatuwar da zama shiga gaba-gaban ruwan electromagnetic da yanayi. Don neman tarihin tatuwar a lokacin tattalin hankali mai sarrafa, za a gina wannan model: Amsa cewa tarihin tatuwar ta fi dace a lokacin tattalin hankali mai sarrafa. Sannan, tana neman tarihin rayuwarsa tun daga kananan kuliyan da ya yi aiki a tsakiyar tsakiya. Ingantaccen bayanai sun hada da: Figure 1 (tarihi tatuwar), Figure 2 (cikakken tattaunuka a lokacin tattalin hankali mai sarrafa), da Figure 3 (tarihi tatuwar).

u na nufin ruwan tatuwar mai inganta, da kuma kungiyarren takaice:

A cikin kungiyarren:U_m shigo da amfani da ruwan bus; w₀ shigo da amfani da frequency angular; w₀ shigo da amfani da phase angle wanda aka samu a lokacin tattalin hankali mai sarrafa. A lokacin tattalin hankali a cikin arc-burning stage, ruwan i_L da ke faruwa a kananan kuliyan:

A cikin kungiyarren: δ1 shigo da amfani da atadu; IL shigo da amfani da ampere da inductance;R1 shigo da amfani da resistance da take wasu tatuwar da line-mode loop; e shigo da amfani da phase angle a lokacin tattalin hankali mai sarrafa; L shigo da amfani da zero-sequence inductance da inductance da ke faruwa a kananan kuliyan.

An samu nasara a cikin current da inductive da kananan kuliyan, da kuma an samu kungiyarren:

A cikin kungiyarren:i_C shigo da amfani da compensated grounding current; C shigo da amfani da capacitance-to-ground da distribution line; v shigo da amfani da detuning degree da substation system. A lokacin tattalin hankali mai sarrafa a cikin stable grounding state, inductive current da kananan kuliyan yana takaice da fi dace.

Daga cikakken nau'in, an samu kungiyarren:

A cikin kungiyarren:R_L shigo da amfani da equivalent resistance da take wasu tatuwar da line-mode loop (wato original “equivalent inductance” yana da damu; an gina da “equivalent resistance” saboda logic circuit; idan yana da inductance, ba da symbol L_L); w₀ shigo da amfani da power-frequency angular frequency.

An za kungiyarren (4) zuwa kungiyarren (5) don neman inductive current, da kuma an samu kungiyarren:

Daga cikakken Kungiyarren (6), a lokacin arc-extinction stage, inductance da kananan kuliyan da capacitance-to-ground da distribution line suka faruwa a cikin series, da kuma ruwan system yana da uniform. Bayan inductive current ta fi dace, kungiyarren takaice muna sama da:

A cikin kungiyarren: u_C0+shigo da amfani da capacitance-to-ground voltage da system a lokacin arc-extinction stage; i_L0+ shigo da amfani da inductive current da ke faruwa a kananan kuliyan da system a lokacin arc-extinction stage; w shigo da amfani da resonant angular frequency. Daga cikakken nau'in, a farkon tattalin hankali mai sarrafa, abubuwan da ke tabbatar da rayuwarsa na tatuwar su ne da yawa, kamar yadda ake nuna a Table 1.

2 Gargajiya da Bincike Modelin Simulation
2.1 Gargajiya Model
Gargajiya modelin simulation ta faruwa a cikin parametoren tatuwar da take wata, kamar yadda ake nuna a Table 2. Parametoren cable line suna nuna a Table 3.

2.2 Bincike Model

A binciken model, don inganta gaskiya da fasaha bayanai, za a set tattalin hankali mai sarrafa a wurare 4 km daga 1 A cable line da 10 kV bus. Phase angle da tattalin hankali mai sarrafa yana neman 90° a matsayin rufe. Amfani da modelin simulation da aka gina don samun zero-sequence currents da take lines a cikin tattalin hankali mai sarrafa, kamar yadda ake nuna a Table 4.

A lokacin tattalin hankali mai sarrafa, kungiyarren takaice muna sama da capacitive current da take lines na tatuwar:

Daga cikakken bayanan a Table 4, a lokacin tattalin hankali mai sarrafa, fadada dabi'a daga value da aka samu daga simulation da value da aka neman da ita da capacitance-to-ground current yana da -0.848%, da kuma babu nasara mai yawa.

3 Tattalin Nau'in Rayuwarsa
3.1 Tabbatar da Initial Phase Angle

A cikin arc-burning stage, voltages mai sarrafa suka canzawa. Voltages A, B, da C suka rage, wanda yake da shirya initial fault phase angle da kuma rage voltage distortion. A cikin stable stage, initial phase angle mai yawa yana da shirya waɗannan lokaci da voltages suka ci. A cikin arc-extinction stage, hakan da initial phase angles da dama, voltages suka canzawa daidai: Voltage A yana rage zuwa ampere na normal; Voltage B yana rage zuwa ampere na normal; Voltage C yana rage zuwa ampere na kadan da kuma rage zuwa ampere na normal. Saboda currents: A cikin arc-burning stage, initial phase angle mai yawa yana rage currents; a cikin stable stage, yana rage currents; a cikin arc-extinction stage, currents suka canzawa daidai.

3.2 Tabbatar da Transition Resistance

A cikin arc-burning stage, transition resistance mai kadan yana rage voltages; a cikin stable stage, yana rage voltages (amplitudes B da C su ne da kadan). A cikin arc-extinction stage, voltages suka canzawa daidai: Voltage A yana rage zuwa ampere na normal, Voltage B yana rage zuwa ampere na normal, da Voltage C yana rage zuwa ampere na kadan da kuma rage zuwa ampere na normal. Saboda currents: A cikin arc-burning stage, transition resistance mai kadan yana rage currents. A cikin first stage (resistance mai yawa) currents su ne da kadan; a cikin second stage (resistance mai kadan) currents su ne da yawa; a cikin third stage, da kananan kuliyan suka stop, currents A da C suka rage zuwa ampere na normal.

4 Kalmomin

Tattalin hankali mai sarrafa a cikin tattaunuka yana rage currents na tatuwar. Don inganta fasaha da gaskiya tattalin kasa, ya kamata a fahimtar rayuwarsa na tatuwar da kuma tarihin tabbatar da rasu. Saboda tattaunuka tana da tabbatar da abubuwan da dama, masana tattaunukan da za su iya hasashen tattaunuka, yin aiki mai kyau, da kuma inganta tattalin hankali mai sarrafa don taimakawa rayuwar yau da kullum.