Daga cewa Tadakinga Cement Ta Bace da GIS Wall Penetrations

Gwaji GIS na gida yana da muhimmanci a wani abubuwa, kafin ba a yi amfani da tushen kablodan ba. A baya, duk da cewa mafi girman ko siffofan bus duct ta shiga da gida ta fitar da rudi har zuwa gwajin, inda yake da ita da shirin porcelen ko composite bushings don tushen kablodan. Amma, fadada da ke cikin darajar da GIS bus duct ta shiga har zuwa gwajin yana iya zama wani muhimmiyar fadada mai ruwa da hawa, saboda haka ana bukata da ake kwallace. Wannan takarda ya bayyana dalilai da ba a yi amfani da cement-based sealing ba.

An rubuta a wannan 2015 edition na China Southern Power Grid’s Anti-Accident Measures cewa ba a yi amfani da cement don kwallace gwajin da bus duct na GIS ta shiga.

Dalilin da ya faru wannan na'ura shine tsarin jimi da ke faru a kan kompojinta alkaline a cikin cement da aluminum alloy da ake amfani a GIS enclosures. Idan cement mai ruwa (ba a yi harden) ko cement da ya sa ruwa ya tabbatar da aluminum surface, za a iya faru rust, wanda zai iya haifar da gas leakage. Tabbacin da wannan ya faru ne idan cement ya kasance mai ruwa—idandana a yi harden, akwai laifi masu mahimmanci. Amma, wannan batu yana bukata da ake nuna a cikin lokacin tashar gwaji.

Idan zaruratsofin cement ta tabbatar da ruwa, ya faru hydration a kan surface layer by layer. Abubuwan da suka samu a kan hydration sun hada da: calcium silicate hydrate (C-S-H) gel, calcium ferrite hydrate gel, calcium hydroxide (Ca(OH)₂), calcium aluminate hydrate, da ettringite. Daga cikinsu, alkaline substances kamar calcium hydroxide da calcium aluminate hydrate zai iya faru jimi da aluminum alloy, wanda zai iya haifar da GIS enclosure.

Ko da cement, akwai wasu abubuwan da ake amfani don kwallace kamar asbestos boards ko waterproof sealants a wurare da bus duct ta shiga. Amma, asbestos boards suna da wasu kompojinta cementitious, da kuma sealants da ba a dole a zaba—masu alkaline—zai iya haifar da aluminum alloy enclosure, wanda zai iya haifar da gas leakage.

Idan aluminum alloy tana da muhimmanci a kan korona a air, akwai wani tsari na korona: cement zai iya faru paint layer da ke ciki a surface da enclosure, saboda paint tana da muhimmanci a kan korona musamman da aluminum. Idan coating ya kasance, metal da ke ciki zai iya haifar. A cikin tashar gwaji, wanda ya faru wannan shine ma a yi primer ko putty layer a matsayin ƙarin da ake paint over cement.

Wannan ya bayyana asalin na'ura da ba a yi amfani da cement don kwallace bus duct na GIS da take shiga da gwajin.