Tambayar da Masana Lalle ga Gas a Wajen Samun Tank Circuit Breakers a Yankunan Da Kuma Yake Rike

Bayanin Gari na Sulfur Hexafluoride (SF₆) Circuit Breakers da Abincin Gas Liquefaction

Aiki na circuit breakers ta SF₆, wanda yana amfani da gas sulfur hexafluoride—wanda yake da muhimmanci a tsarkar zama-zamantaka da kuma gaskiya—don zama-zamantaka, ana yi aiki da kyau a cikin masu shiga. Wadannan breakers suka fi dace don amfani a wurare da ake yi karfi da kuma tushen da ke bukatar hanyoyin zuwa. A Najeriya, SF₆ circuit breakers suna yi aiki don matsayin fassara da 110kV ko uku. Amma, saboda muhimmiyar halayar gas SF₆, yana iya zama maye da kafin yake da hankali da sararin jikin da kuma kadan. Idan kadan ya rage wa mutane, yana iya haifar da protection lockout. A wasu wurare a Najeriya, kamar Inner Mongolia, Northeast China, Xinjiang, da kuma Tibet, inda yanayin hawa ya fi kusa -30°C ko uku a ranar rike, an samun abin da ya faruwa ne da kuma tushen da ke bukatar hanyoyin zuwa.

Rarrabe Na'urar Gas SF₆ Maye Da Kafin Yake Da Hankali Da Sararin Jikin Da Kuma Kadan

Gas SF₆ yana da muhimmiyar gaskiyar kimikin. Yana da wannan da ba da lafiya, ba da kalmomi, ba da ma'adon, kuma ba da kafin yake da hankali da sararin jikin, tare da muhimmin gaskiyar da kuma zama-zamantaka.

Sararin jikin mai sarrafa wata gas yana nufin sarakunan jikin da ake iya maye da kafin yake da hankali da sararin jikin. Idan jiki tana da take da wannan balale, ba za a iya maye da kafin yake da hankali da sararin jikin bai kan da kadan da take da take.

Don "gase da sauran lokaci" kamar oxygen, nitrogen, hydrogen, da helium, sarakunan jikin da suka maye da kafin yake da hankali da sararin jikin suka da take da -100°C, saboda haka ba za a iya maye da kafin yake da hankali da sararin jikin a cikin yanayin hawa. Gas SF₆ ce yana da nasarar, sarakunan jikin da suka maye da kafin yake da hankali da sararin jikin yana da 45.6°C. Yana iya da take da take da gase da kuma jiki da take da 45.6°C. A cikin yanayin hawa, yana iya maye da kafin yake da hankali da sararin jikin idan kadan ya rage wa mutane. Saboda haka, don aikinsu da ake amfani da gas SF₆, ba za a iya maye da kafin yake da hankali da sararin jikin.

Karamin bayanin state parameter curve na gas SF₆ ta haka ne a Figure 1. Idan kadan ya rage wa mutane, kadan gas yana rage wa mutane. Idan jiki ya rage wa mutane har zuwa sarakunan jikin da ake maye da kafin yake da hankali da sararin jikin, gas yana faruwar da maye da kafin yake da hankali da sararin jikin, kuma kadan gas yana rage wa mutane.

Gagarumin Tsakanin Masu Shiga

Ximeng Converter Station yana cikin Chaoke Wula Sumu, Xilinhot City, Xilingol League, Inner Mongolia Autonomous Region. Ta da takalma da 914 mita da kuma latitudi da 44.2°, tana da ranar rike da take da shekaru biyu da kuma an kirkiro a cikin ranar rike. A cikin AC filter yard na station, an fito 20 sets of 3AP3 DT tank-type circuit breakers da ake amfani da shi a Hangzhou Siemens, da rated voltage da 550 kV. Wadannan breakers suna da density relays da suka da temperature-compensation function, da kuma bayanin suka nuna canza a cikin kadan gas kawai kadan pressure. Muhimman parametere na breakers su ne a Table 1.

A cikin tattalin fitowa, an yi gas charging da kuma amfani da parametere da ake bayar da shi a kan gabas. An setta rated gas-charging pressure a 0.8 MPa, alarm pressure a 0.72 MPa, da kuma lock-out pressure a 0.7 MPa (gauge pressure a 20°C). State parameter curve na gas SF₆ ta haka ne a Figure 2. Daga cikin bayanin, idan tank ta da take da take da kuma ba suka da gas leakage, gas a cikin tank yana faruwar da maye da kafin yake da hankali da sararin jikin idan jiki ya rage wa -18°C; an kawo alarma idan jiki ya rage wa -21°C; da kuma breaker yana haifar da protection lockout idan jiki ya rage wa -22°C. Tsakanin masu shiga ta haka ne a Figure 3.

Tsakanin masu shiga ta haka ne tana daidaita da cikakken bayanin da aka samu daga state parameter curve.

 Idan an yi amfani da supply materials da kuma progress da ake yi aikin, tank-type circuit breakers suna daidai fitowa, vacuum-pumping, da kuma gas-filling operations a ranar farko na Novemba. An yi handover tests da kuma commissioning work a cikin dasar da na Decemba. A wannan lokacin, jiki ya rage wa -22°C, da kuma duka daidai fitowar breakers suka haifar da protection lockout, tare da kuma an yi handover tests a cikin breakers da kuma tushen da ke bukatar hanyoyin zuwa.

Farkon

Saboda abin da aka samu a cikin tsakanin masu shiga, an bayyana farkon da take:

Rage Gas-filling Quantity

Daga cikin bayanin state parameter curve na gas SF₆, idan kadan gas a cikin tank yana rage wa, jiki da ake maye da kafin yake da hankali da sararin jikin yana rage wa, da kuma lock-out temperature yana rage wa. Misali, idan an rage rated gas-filling pressure a 0.56 MPa, jiki da ake maye da kafin yake da hankali da sararin jikin yana rage wa -28°C, da kuma lock-out temperature yana rage wa -32°C. A wannan lokacin, jiki da ake maye da kafin yake da hankali da sararin jikin yana rage wa da kuma ba za a iya haifar da protection lockout. Amma, idan an rage kadan gas, zama-zamantaka da kuma gaskiyar breakers yana rage wa. Farkon da take da canza a cikin gaskiyar da kuma aikin da ke bukatar hanyoyin zuwa, ya kamata ake yi tabbacin da kuma amincewa da design unit da kuma gabas.

Idan ba za a iya canza a cikin gaskiyar da kuma aikin, ya kamata an rage kadan gas (misali, 0.6 MPa) idan an yi handover test, da kuma an kara kadan gas a rated value idan an yi test da kuma commissioning. Wannan zan iya zama daidai, amma, ba zan iya. Kafin an rage kadan gas, gaskiyar breakers yana rage wa. Ba da bayanin da ba da shiga, akwai irin da zama-zamantaka breakers yana rage wa a cikin test. Idan an yi test da kuma an yi shiga, ba za a iya amfani da cikakken bayanin. Handover test na aikin tana nufin amfani da cikakken bayanin da ake bayar da shi a kan gabas da kuma ake yi aikin, da kuma an yi shiga a cikin aikin. Da kuma gas-filling process tana nufin wata aikin.

Amfani Da Mixed Gas

Yanzu, a cikin nahiyar da kuma dukiyar, akwai wata da suka rage jiki da ake maye da kafin yake da hankali da sararin jikin tare da amfani da mixed gas (kamar CF₄, CO₂, da N₂) a cikin gas SF₆. Amma, gaskiyar da kuma zama-zamantaka na mixed gas ba suka da take da take da pure SF₆ gas. Idan an yi amfani da gas-filling pressure, current-breaking capacity na circuit breaker da ake amfani da mixed gas yana rage wa da kuma yana da take da take da 20% da pure SF₆ gas. Idan an yi amfani da gas-filling pressure, current-breaking capacity na circuit breaker da ake amfani da mixed gas yana rage wa da kuma yana da take da take da 20% da pure SF₆ gas.

Misali, idan an amfani da SF₆/N₂ mixed gas, an iya amfani da formula da take:

P_m=P_SF6(100/x%)^0.02

A cikin formula, Pm yana nufin gas-filling pressure na mixed gas don amfani da cikakken gaskiyar, P_SF6 yana nufin gas-filling pressure na pure SF₆ gas, da kuma x% yana nufin percentage content na SF₆ gas a cikin mixed gas. Daga cikin bayanin, idan an amfani da SF₆/N₂ mixed gas da 20% SF₆ gas, an bukata gas-filling pressure da take da 1.4 times na pure SF₆ gas. Don tsakanin masu shiga, an bukata gas-filling pressure a 1.12 MPa, wanda ya kamata ake yi tabbacin da kuma amincewa da structure na circuit breaker.

Fitowa Da Heating Devices

Babu da sai dai sababban gas SF₆ maye da kafin yake da hankali da sararin jikin shine jiki ya rage wa. Idan an fito tracing heater a cikin tank don kara jiki, zan iya haifar da problem na maye da kafin yake da hankali da sararin jikin.

Tank-type circuit breakers na Hangzhou Siemens suna amfani da Swiss trafag density relay, wanda yana da temperature-compensation function, da kuma bayanin suka nuna canza a cikin kadan gas kawai kadan pressure. Bayanin principle na density relay shine don kara kadan gas tare da kara kadan gas a cikin circuit breaker tank da kuma standard gas da ake amfani da shi a cikin density relay. Misali, idan jiki ya rage wa a cikin range na maye da kafin yake da hankali da sararin jikin, kadan gas a cikin gas chambers yana rage wa, kadan difference yana da zero, expansion joint ba suka yi amfani, da kuma meter pointer ba suka yi amfani; idan gas a cikin tank yana maye da kafin yake da hankali da sararin jikin ko suka da leakage, kadan standard gas yana rage wa, expansion joint yana yi amfani, da kuma meter pointer yana yi amfani.

Idan jiki ya rage wa a cikin range na maye da kafin yake da hankali da sararin jikin, tracing heater yana yi amfani, da kuma jiki a cikin tank yana rage wa. Wannan yana haifar da temperature difference a cikin gas a cikin tank da kuma gas a cikin expansion joint, wanda yana haifar da deviation a cikin indication na meter, da kuma ba za a iya nuna cikakken bayanin gas a cikin tank.

Kammala

Wannan rubutu tana bayyana abin da ake samu a cikin maye da kafin yake da hankali da sararin jikin na gas SF₆. Saboda abin da ake samu a cikin maye da kafin yake da hankali da sararin jikin na gas SF₆ da ake samu a cikin fitowar tank-type circuit breakers a cikin AC filter yard na Ximeng Converter Station, an bayyana farkon da take: rage gas-filling quantity, replacement with mixed gas, da kuma adding heating devices. Daga cikin bayanin, an samun cewa rage gas-filling quantity da kuma replacement with mixed gas yana rage zama-zamantaka da kuma gaskiyar, saboda haka ba suka da take da take. Yadda ake amfani da tracing heater don kara jiki a cikin tank don haifar da maye da kafin yake da hankali da sararin jikin, ba zan iya haifar da error a cikin indication na meter, amma zan iya amfani da shi don haifar da maye da kafin yake da hankali da sararin jikin, saboda haka tana da take da take da solution.