Ndi zida ziti zomwe zimagwiritsidwa ntchito ndi bolodi la epoxy glass fiber cloth?

Kudalirika ndi moyo wautumiki wa ntchito yokhotakhota zimadalira kwambiri ntchito ya insulating material. Zomwe zimafunikira pakugwirira ntchito kwa zida zotsekera zikuphatikizapo magetsi, kukana kutentha ndi makina. Nkhaniyi Ms. akunena mwachidule zachidule cha machitidwe a magetsi a zipangizo zotetezera. Mphamvu zamagetsi zazinthu zotsekera zimaphatikizira mphamvu yakusweka, kutsekereza resistivity, permittivity ndi kutayika kwa dielectric. Gawani mphamvu zowonongeka ndi makulidwe a zinthu zotetezera pa malo owonongeka, omwe amafotokozedwa mu kilovolts/mm. Kuwonongeka kwa zipangizo zotetezera kungathe kugawidwa m’njira zitatu: kuwonongeka kwa magetsi, kuwonongeka kwa kutentha ndi kuwonongeka kwa magetsi. Zofunikira pakuchita kwamagetsi pamakina oteteza zinthu ndizofunikira kwambiri pakuwonongeka kwamphamvu yamagetsi komanso kukana kwamagetsi.

Malingana ndi mtundu wa galimoto, zofunikira zina zamagetsi sizili zofanana. Mwachitsanzo, kutchinjiriza kwa ma motors okwera kwambiri kumafuna kutayika kwa dielectric kwazinthu zoteteza komanso kukana kwa corona; ndi gawo lamagetsi lamagetsi pakati pa chitsulo chachitsulo ndi woyendetsa ayenera kuganiziridwa. Kuchuluka kwa gawo lamagetsi kumawonjezeka. Kutaya tangent kumawonjezekanso. Mphamvu yamagetsi ikawonjezeka kufika pamtengo wina, thovu mkati mwa sing’anga kapena m’mphepete mwa elekitirodi lidzamasulidwa pang’ono, ndipo tangent yotayika mwadzidzidzi imawonjezeka kwambiri. Mphamvu yamagetsi iyi imatchedwa voteji yaulere yoyamba. Mu engineering, muyeso woyambira wamagetsi waulere nthawi zambiri umagwiritsidwa ntchito kuyang’ana kusiyana kwa mpweya mkati mwa kapangidwe ka insulation kuti muwongolere mtundu wa insulation. Kuphatikiza apo, zida zina zotetezera ziyeneranso kuganizira zamagetsi monga kukana kwa corona, kukana kwa arc, komanso kukana kutayikira.

Kutayika kwa dielectric kwa insulating material. Zida zotetezera zimatulutsa mphamvu zowonongeka chifukwa cha kutayikira kwa magetsi ndi polarization pansi pa ntchito ya magetsi. Kawirikawiri, kutaya mphamvu kapena kutaya tangent kumagwiritsidwa ntchito kusonyeza kukula kwa kutaya kwa dielectric. Pansi pa mphamvu ya magetsi a DC, kuyitanitsa nthawi yomweyo, kuyamwa kwapano ndi kutayikira kwapano kudzadutsa. Mphamvu ya AC ikagwiritsidwa ntchito, kuthamangitsa nthawi yomweyo kumakhala kokhazikika (capacitive current); kutayikira panopa ali mu gawo ndi voteji ndipo ndi yogwira panopa; mayamwidwe panopa ali zonse zotakataka panopa chigawo chimodzi ndi yogwira panopa chigawo chimodzi. Zinthu zazikulu zomwe zimakhudza kuwonongeka kwa dielectric kwa zida zotetezera. Popeza pali kutayika kosiyanasiyana kwa dielectric pama frequency osiyanasiyana, ma frequency ena ayenera kusankhidwa poyezera kutayika kwa tangent. Nthawi zambiri, zida zomwe zimagwiritsidwa ntchito mugalimoto nthawi zambiri zimayezedwa chifukwa cha kutayika kwa dielectric pama frequency amagetsi.

Pansi pa mphamvu yamagetsi, zida zotetezera nthawi zonse zimakhala ndi mpweya wocheperako. Gawo lamakonoli limayenda mkati mwa zinthu; mbali yake imayenda pamwamba pa zinthuzo. Chifukwa chake, resistivity ya insulation imatha kugawidwa kukhala voliyumu resistivity ndi surface resistivity. Voliyumu resistivity limasonyeza mkati magetsi madutsidwe wa zinthu, ndi unit ndi ohm · mita; Kupambana kwapamwamba kumadziwika ndi mphamvu yamagetsi pamtunda wa zinthu, ndipo unit ndi ohm. Voliyumu resistivity wa zinthu insulating zambiri mu osiyanasiyana 107 kuti 1019 m · m. Resistivity ya zipangizo zotetezera nthawi zambiri zimagwirizana ndi zotsatirazi. Zonyansa zambiri muzinthu zoteteza zimatulutsa ma ion conductive, omwe amatha kulimbikitsa kupatukana kwa mamolekyu a polar, ndikupangitsa kuti resistivity igwe mwachangu. Pamene kutentha kumakwera, resistivity imachepa kwambiri.