Nā Koina Hoʻokaʻawale no nā Uea DC a me nā Pilikia me PP

I kēia manawa, nā mea i hoʻohana pinepine ʻiamea hoʻokaʻawaleno nā kaula DC he polyethylene. Eia nō naʻe, ke ʻimi mau nei nā mea noiʻi i nā mea hoʻomehana hou aʻe, e like me ka polypropylene (PP). Eia nō naʻe, ʻo ka hoʻohana ʻana iā PP ma ke ʻano he mea hoʻomehana kaula e hōʻike ana i kekahi mau pilikia.

 

1. Nā Waiwai Mekanika

I mea e hoʻokō ai i nā koi kumu no ka halihali, ke kau ʻana, a me ka hana ʻana o nā kaula DC, pono i ka mea insulation ke loaʻa i kekahi ikaika mechanical, me ka maʻalahi maikaʻi, ka elongation i ka haki ʻana, a me ke kūpaʻa hopena haʻahaʻa. Eia nō naʻe, ʻo PP, ma ke ʻano he polymer crystalline kiʻekiʻe, hōʻike i ka paʻakikī i loko o kona pae mahana hana. Eia kekahi, hōʻike ia i ka brittleness a me ka hiki ke haki i nā wahi haʻahaʻa, ʻaʻole hiki ke hoʻokō i kēia mau kūlana. No laila, pono e kālele ka noiʻi i ka hoʻoikaika ʻana a me ka hoʻololi ʻana iā PP e hoʻoponopono i kēia mau pilikia.

 

2. Ke Kū'ē ʻana i ka ʻElemakule

I ka wā e hoʻohana lōʻihi ai, e ʻelemakule mālie ana ka insulation uwea DC ma muli o nā hopena i hui pū ʻia o ka ikaika o ke kahua uila kiʻekiʻe a me ke kaʻapuni wela. ʻO kēia ʻelemakule e alakaʻi i ka emi ʻana o nā waiwai mechanical a me ka insulation, a me ka emi ʻana o ka ikaika breakdown, e hoʻopilikia hope ana i ka hilinaʻi a me ke ola lawelawe o ke kaula. ʻO ka ʻelemakule ʻana o ka insulation uwea e pili ana i nā ʻano mechanical, electrical, thermal, a me nā kemika, me ka ʻelemakule uila a me ka thermal ka mea hopohopo nui loa. ʻOiai ʻo ka hoʻohui ʻana i nā antioxidants hiki ke hoʻomaikaʻi i ke kūʻē ʻana o PP i ka ʻelemakule oxidative thermal i kekahi ʻano, ʻo ka launa maikaʻi ʻole ma waena o nā antioxidants a me PP, ka neʻe ʻana, a me ko lākou haumia ma ke ʻano he mau mea hoʻohui e hoʻopilikia i ka hana insulation o PP. No laila, ʻo ka hilinaʻi wale ʻana i nā antioxidants e hoʻomaikaʻi i ke kūʻē ʻana o PP i ka ʻelemakule ʻana, ʻaʻole hiki ke hoʻokō i nā koi ola a me ka hilinaʻi o ka insulation uwea DC, e pono ai ka noiʻi hou aku i ka hoʻololi ʻana iā PP.

 

3. Hana Hoʻokaʻawale

ʻO ka uku hakahaka, ma ke ʻano he hoʻokahi o nā mea e hoʻopili ai i ka maikaʻi a me ke ola onā uwea DC kiʻekiʻe-voltage, hoʻopilikia nui i ka hoʻolaha ʻana o ke kahua uila kūloko, ka ikaika dielectric, a me ka ʻelemakule ʻana o nā mea insulation. Pono nā mea insulation no nā kaula DC e kāohi i ka hōʻiliʻili ʻana o ka uku hakahaka, e hōʻemi i ka hoʻokomo ʻana o nā uku hakahaka like-polarity, a pale i ka hana ʻana o nā uku hakahaka like-polarity e pale aku i ka hoʻopilikia ʻana o ke kahua uila i loko o ka insulation a me nā interfaces, e hōʻoiaʻiʻo ana i ka ikaika haki ʻole a me ke ola o ke kaula.

Ke noho nā kaula DC i loko o kahi kahua uila unipolar no kahi manawa lōʻihi, ʻo nā electrons, ions, a me ka ionization haumia i hana ʻia ma ka mea electrode i loko o ka insulation e lilo i mau uku hakahaka. Neʻe koke kēia mau uku a hōʻiliʻili i loko o nā ʻeke uku, i ʻike ʻia ʻo ka hōʻiliʻili ʻana o ka uku hakahaka. No laila, i ka wā e hoʻohana ai iā PP i nā kaula DC, pono nā hoʻololi e kāohi i ka hana ʻana a me ka hōʻiliʻili ʻana o ka uku.

 

4. Ka Hoʻokele Wela

Ma muli o ka conductivity thermal maikaʻi ʻole, ʻaʻole hiki i ka wela i hana ʻia i ka wā o ka hana ʻana o nā kaula DC PP-based ʻaʻole hiki ke hoʻokahe koke, e hopena ana i nā ʻokoʻa mahana ma waena o nā ʻaoʻao o loko a me waho o ka papa insulation, e hana ana i kahi kahua mahana like ʻole. Hoʻonui ka conductivity uila o nā mea polymer me ka piʻi ʻana o ka mahana. No laila, ʻo ka ʻaoʻao o waho o ka papa insulation me ka conductivity haʻahaʻa e lilo i mea maʻalahi i ka hōʻiliʻili ʻana o ka uku, e alakaʻi ana i ka emi ʻana o ka ikaika o ke kahua uila. Eia kekahi, ʻo nā gradients mahana ke kumu o ka hoʻokomo ʻana a me ka neʻe ʻana o ka nui o nā uku hakahaka, e hoʻopilikia hou ana i ke kahua uila. ʻO ka nui o ka gradient mahana, ʻo ka nui o ka hōʻiliʻili ʻana o ka uku hakahaka, e hoʻoikaika ana i ka hoʻopilikia ʻana o ke kahua uila. E like me ka mea i kūkākūkā ʻia ma mua, ʻo ke kiʻekiʻe o ka mahana, ka hōʻiliʻili ʻana o ka uku hakahaka, a me ka hoʻopilikia ʻana o ke kahua uila e pili ana i ka hana maʻamau a me ke ola lawelawe o nā kaula DC. No laila, ʻo ka hoʻomaikaʻi ʻana i ka conductivity thermal o PP he mea pono ia e hōʻoia i ka hana palekana a me ke ola lawelawe lōʻihi o nā kaula DC.