Dabbobi-Karfi na Votoci Masu Isuli mai Kafin Epoxy da Tashar Gargajiya a Bayyana

1 Ingantacciyar Matar da Kudin Karkashin

A cikin tarihin gadi na ingantacciyar karkashin kudin karkashin RMU (Ring Main Units) da ke da mutane, ingantacciyar karkashin yana cuta da 40% daga jumla gadi. Saboda haka, zan iya zaɓi ingantacciyar matar daidai, kudin karkashin daidai, da kuma yaƙe masu daidai na ingantacciyar karkashin yana da muhimmanci ga mafi girman RMU. Daga lokacin da aka gina resin epoxy a shekarar 1930, an yi tasiri a kan abubuwa da suka haifar da shi.

Resin epoxy ana samun suna da tsarin kasa mai kyau, ma'ana mai kyau, inda kafin karya da kula, da kuma sauƙi a yi koyarwa. Saboda haka, an zaba shi a matsayin matar daidai na ingantacciyar karkashin RMU. A nan an yi amfani da hardeners, tougheners, plasticizers, fillers, da kuma colorants, don bayyana resin epoxy mai kyau. Tsarin kasa, tsarin kafin kula, da kuma tsarin kula shi ana da sauri, wanda ya ba shi damar daidai da kuma ingantacciyar karkashin mai kyau a cikin gadi da kula da kula da kula.

A cikin RMU, tsarin karkashin na biyu na iya bincika tsarin kasa ta daidai. A cikin waɗannan tsarin, in yi karfin zama da ingantacciyar karkashin ba sauransu. Saboda haka, ya kamata a yi sauransu a kan tsarin karkashin. Tsarin kasa na resin epoxy yana da sarrafa 22 zuwa 28 kV/mm, wanda ya ba shi damar daidai don koyarwa a cikin zama da ido, saboda haka, ana bukatar yarda da matafi mai kusa da mm, wanda ya ci gadi da rayuwar daidai.

2 Kudin Karkashin RMU na Kudin Karkashin Solid-Insulated

Duk fayilolin da suke da shirya, misali vacuum interrupters, disconnect switches, da kuma grounding switches, suka fitowa a cikin mold da kuma suka yi casting ta hanyar resin epoxy mai kyau a cikin prosesi Automatic Pressure Gelation (APG). Abubuwan da suka haifar da shi a cikin kasa shi ne vacuum, sannan ingantacciyar karkashin shi ne resin epoxy mai kyau. Kabinet shi ana samun kudin modular, wanda ya ba shi damar daidai don koyarwa. Har da kada suka fitowa a cikin metal partitions don koyarwa, wanda ya ba shi damar daidai don koyarwa.

An yi kudin karkashin busbar da contact connectors. Busbar mai kyau yana da segmented, insulated enclosed busbars da suke fitowa a cikin telescopic integrated busbar connectors, wanda ya ba shi damar daidai don koyarwa. Kafin kula, an yi kudin karkashin door structure don koyarwa, wanda ya ba shi damar daidai don koyarwa. An yi koyarwa a cikin viewing windows, wanda ya ba shi damar daidai don koyarwa.

3 Kyakkyawar da Bayanin Test Type na RMU na Kudin Karkashin Solid-Insulated
3.1 Kyakkyawar Masu Yawan

• Resin epoxy mai kyau ya ba shi damar daidai don koyarwa da kuma partial discharge (≤5 pC).

• Tsarin karkashin mai kyau da kuma mai kyau ba suka fitowa a cikin live parts, saboda haka, ya ba shi damar daidai don koyarwa. Ba suka fitowa a cikin environmental conditions, kuma ya ba shi damar daidai don koyarwa a cikin high/low temperatures, plateaus, explosion-proof areas, da kuma polluted regions. Ya ba shi damar daidai don koyarwa a cikin SF₆ gas pressure changes at high temperatures and gas liquefaction at low temperatures. Misali, Fuzhou, wanda yake a cikin coastal high-salt-fog area, ya ba shi damar daidai don koyarwa a cikin salt-fog resistance.

• Ba a yi amfani da SF₆ gas, ba suka fitowa a cikin harmful gases, saboda haka, shi ne product mai kyau. Ba suka fitowa a cikin leakage, saboda haka, ba suka bukata a yi maintenance—making it maintenance-free. Enhanced explosion-proof design ya ba shi damar daidai don koyarwa. Fully insulated three-phase structure ya ba shi damar daidai don koyarwa, saboda haka, ya ba shi damar daidai don koyarwa.

• Shi ne ultra-compact product, saboda haka, ya ba shi damar daidai don koyarwa.

3.2 Bayanin Test Type

A cikin waɗannan kyakkyawar, an yi test type, including insulation withstand voltage tests (42 kV/48 kV), partial discharge measurement (≤5 pC), high/low temperature tests (+80 °C / -45 °C), condensation tests (Pollution Level II), and internal arc tests (0.5 s). Bayanin test an ba shi damar daidai don parameter requirements, wanda ya ba shi damar daidai don koyarwa.

Kuma, an yi waɗannan test type required by national standards: temperature rise test, main circuit resistance measurement, rated peak and short-time withstand current tests, rated short-circuit making and breaking capacity tests, electrical endurance, mechanical endurance, fault tests under phase-to-phase grounding, rated active load current switching tests, and rated capacitive current switching tests. Duk bayanin test an ba shi damar daidai don national standard requirements.

State Grid Corporation of China has held multiple meetings to discuss the type test items and parameter requirements for medium-voltage solid-insulated RMUs, with in-depth discussions on specific details such as whether the partial discharge limit should be ≤5 pC or ≤20 pC. We believe that the type tests mandated by national standards are essential and must be performed; additional tests conducted to verify product advantages are also necessary; furthermore, special tests such as vibration and severe climate condition tests should be selected based on the actual operating environment. Regarding parameters, while State Grid sets only baseline requirements, manufacturers can appropriately enhance specifications according to product performance—for instance, raising the partial discharge limit to ≤5 pC and extending the temperature range for high/low temperature tests.

4 Kalmomin

Solid insulation yana da kyakkyawar masu yawan da gas da air insulation: ingantacciyar karkashin mai kyau, ba suka fitowa a cikin harmful gas emissions, environmental friendliness, da kuma ba suka fitowa a cikin leakage issues. The application of solid insulation technology has greatly enhanced the miniaturization and environmental adaptability of medium-voltage RMUs, enabling wide application in high/low temperatures, plateaus, explosion-proof areas, and polluted regions. All these advantages have been fully validated through type testing.