Rêbzanên Serxistina Vakûm Interrupter û Şekilkirina Xalîyên Girtînî yên Piştînîn da Unitên Ring Main

Dîrokê Dîtina Daşûna Vacuu Cihazê di Serbestkirinê de

Pirsên herî mîheng a di serbestkirina anjamanan da îro ya ku ji bo şevikirina vacuu cihazê bikar bînin dîrokê tevahî yekemîne an dîrokê destnîşankirinê. Eger dîrokê tevahî yekemîne bikar bînin, dikare li ser rastîna qeydên procesa APG an çendina çavên vacuu cihazê vebijarkirin bêtir bike. Diwêneke, dîrokê tevahî yekemîne pêşvekêrîya tayyîb nake yên xebitandina girêdanê ya sereke û derbarê nivîsên malperê bi rêjiyekî hêsan dibike, ku çêkirinê ya zafiyî bigerîne jî kerê pelanên mijarek din çi wan dikare vacuu cihazên ji berdara fabrikên din hilbijêrin.

Eger destnîşankirina veher û dîrokê destnîşankirinê bikar bînin, serbestkirina derveyî hêliya bikar bîne û navoktina vacuu cihazê bi girtîn e, çunkî neçêranên encapulated pole-type encapulation neçêre ne. Di dîrokê destnîşankirinê de, layerê buffer li ser cihazê neçêre ye - tuhafîya surface yeter e. Ev prosesê pir sedên li ser circuit breakerên vacuu di derveyî de hatî piştgirî kirin. Mezin, dema prodûka hejdişî ye, silikon rubber li ser cihazê bi ewaziya hêsan ên tê gotin, ku stress reliefê tê gotin.

Hilbijartina Temperatûra Transition Glass di Serbestkirinê de

Bingehîn, ji tempiyê temperatûra transition glassê zêde be, materialê dikare tê gotin û piştguhkeribike. Eger temperatûra transition glassê ji bo perzînaya çawî bibegirin, tenê heman materialan dikarin hem temperatûra transition glassê ya bilind û hem perzînaya çewtiya tê gotin. Lakin, ev materialan çendîn in, ku çêkirina çawa zêdetir bike. Eger navbera çi navbera çi navbera çi bi navbera çi zêdetir bike, qebulkirina mijarek dikare zêdetir bike.

Demîn, hilbijartina temperatûra transition glassê bibegire ku hêl di ser SF₆ gas-insulated switchgear insulation components de, wê ji bo SF₆ enclosures, ku contacts upper û lower li ser resin embedded in. Materialan ku bikar bînin genelî çendîn temperatûra transition glassê 100°C û ev prodûkan pir sedên li ser servisê ne û çendîn vêjî darave ji roja overheat, ku belkiyê ya hilbijartina we bikar bîne. Ji perspektîfa switchgear, kontrola temperature rise tê gotin - bi hesabkirina capacity current-î sereke, kontrola conductivity material, quality plating, û precision assembly, lêserê kontrolkirina û kamkirina temperatûra environmentî bi ser design structure. Specifications materialan divê bi evalûasyon comprehensive bikin, bi tevahî dengekarî yên operasyonî yên prodûkan serbest.

Design of Outlet Bushings in Solid Insulation Components

Di serbestkirina outlet bushings solid insulation components de, inlet bushings genelî straight-through type ne, lê outlet bushings herdemî bend design bikar bînin. Bend bushings zor tarîn in, bi pirsên sereke:

• Alignment between conductor and mold, where deformation may occur during conductor pre-treatment;

• Cracking after product molding, as the conductor is at high temperature during molding, and improper process control may lead to cracks after cooling. Additionally, during design, consideration should be given to whether discharge to the installation nut might occur during subsequent installation.

Design of Conductive Components and Connection of Conductive Circuits in Solid Insulation

Di serbestkirina componentên conductive sereke, transîsyonên smooth dibegirin ji bo hertimê ya li ser rastîna requirements current-î - preferably rounded rather than angular. Welding bikar bînin ji bo connections instead of bolted joints to minimize corona discharge and prevent cracking. For movable connections, a knife-switch type connection is preferred, which reduces cost compared to plug-in types, lowers requirements for conductor dimensions and positional accuracy, and allows easier adjustment of loop resistance.

Based on overall loop resistance requirements, it is advisable to specify the loop resistance of conductive parts embedded in resin, particularly for welded conductors, to avoid product scrapping due to excessive resistance caused by poor welding quality. By optimizing conductor shape design, electric field strength to ground (surface grounding layer) can be reduced, adhesion with resin improved, and overall mechanical strength of the insulating component enhanced.

Design of Surface Grounding Layer in Solid Insulation Components

Surface grounding layer treatments include externally coating with conductive silicone rubber, applying conductive adhesive (or paint), or metal spraying. Regardless of the method used, the core objective is to control partial discharge. Without effective control, partial discharge can easily lead to breakdown, which is also related to the design of resin layer thickness. Compared to other shielded insulation components, the structure of solid insulation differs significantly—other components typically feature a concentric cylindrical electric field between high-voltage and ground ends, whether the high-voltage end is a shielding mesh or a circular conductor.

In solid insulation, however, the high-voltage section includes both circular and flat surfaces, while the ground end is flat, necessitating careful consideration of how these structural differences affect performance. From a technical standpoint, two key requirements for the grounding layer are continuity and partial discharge level. During transportation, installation, especially on-site work, any impact damage or peeling may cause partial discharge at the grounding layer's edge, posing new challenges for subsequent operation and protection.

From a heat dissipation perspective, metal spraying offers the best performance due to superior thermal conductivity, significantly enhancing stability against various aging factors, particularly thermal cycling. Protection of the grounding layer must be considered during insulation component manufacturing, and product protection during grounding layer processing is also essential.

Assembly Design of Solid Insulation Body and Bushings

Most designs separate the main body from inlet and outlet bushings, including the connection between fuse insulating tubes and bushings, which are in hard contact during installation. Dimensional control is important, but process control during assembly is equally critical. If contact gaps exist, or if dust or moisture (from environmental condensation) is introduced during assembly, flashover discharge to the mounting nut may occur. Additionally, ring main units have compact structures, so layout must consider ease of installation for inlet/outlet insulation and cables, especially cable terminations, which already demand high installation quality. Inconvenient installation may easily lead to quality issues and cause insulation breakdown.

Conclusion

Solid-insulated ring main units have significant market potential. Research on their core component—the solid insulation element—holds broad prospects. As solid insulation design continues to improve, the technology for solid-insulated ring main units will achieve further advancement.