چییە سوورگەڕێکاری ئۆكسیدی مێتال؟

Metal Oxide Surge Arrester yê çi ye؟

Pîşdanasîna：Arresterê ku zinc oxide semiconductor-ê di materyalê resistor de were bikar bîne hatî metal oxide surge arrester an ZnO Diverter derê. Ev cûr arresterê parzûnandina ji bo hêzekarên AC û DC over-voltages her tîpa dade. Ev dema parzûnandina ji bo over-voltage protection li ser her pîv û stana voltac ên systemê ya elektrik.

Sazkirina & Karwendina Metal Oxide Surge Arrester：Zinc oxide materyalê semiconducting ê N-type ye. Ev bi rêkê fine-grained hate saz kirin. Di navbera on, zêde ten doping materyalan, wekî powders ên oxides însulatingan yên Bismuth (Bi₂O₃), Antimony Trioxide (Sb₂O₃), Cobalt Oxide (CoO), Manganese Oxide (MnO₂), û Chromium Oxide (Cr₂O₃), hate zêde kirin. Mişraja powder hatiye wergerandin di procesên xusûl ve û duwa spray-dried hatiye verjînin bi dawereyek powder sêdar.

Deriyê, powder sêdar hatiye kompreskirin bi forma blocks disc-shaped. Ev blocks hatine sintered bi bîstina ceramic poly-crystalline sêdar. Diska resistor ên metal oxide hatiye paqir kirin bi compound conducting bi sedeya disk ji çendeyên malperîn.

Paqira conducting not only provides proper electrical contacts but also ensures uniform current distribution across the disc. Deriyê, disk hatiye qopkirin di housing porcelain de bi şitî nitrogen gas an SF6 gas. Rubber silicon hatiye bikar bîne bi fix kirina disk û da jî alîkarî dike bi transferkirina heat ji disk bi housing porcelain. Disk bi springên wekî hatiye pêşve kirin.

Elementa ZnO di diverter de series spark gaps needîn hatiye lêserd kirin. Voltage drop di ZnO diverter de hatiye wate di grain boundaries. Ji ber raya her ZnO grain, potential barrier ek hêze dikare bi rêya current ji grain ên din bi next grain.

Di şertên voltage normal, potential barrier hatiye werek kirin ji bo flowkirina current. Lêm, di şertên over-voltage, barrier breaks down, li ser besta transition sharp di current de ji state insulating be state conducting. Li ser vê re, current hate dest pêkirin, û surge hate safetir di ground.

Ji ber vê re surge hatiye girt, voltage across diverters hatiye berd kirin, û current hatiye wergerandin bi value negligible di resistor units. Notably, there is no power follow-current.

Advantages of Metal Oxide Surge Arrester

Metal oxide surge arrester offers the following benefits:

• It eradicates the risks of spark-over and the associated shock to the system when gaps break down.

• It eliminates the requirement for a voltage grading system.

• Under normal operating conditions, the leakage current in the ZnO arrester is significantly lower compared to other types of diverters.

• There is no power follow-current in a ZnO diverter.

• It has a high energy-absorbing capacity.

• ZnO diverters exhibit high stability both during and after prolonged discharge.

• In a ZnO diverter, it is possible to control not only switching surges but also dynamic over-voltages. This enables cost-effective insulation coordination.

Note: Sintering is the process of creating a solid mass of material. This is achieved either by heating the material or by applying pressure to it without melting the material.