220kV fully prefabricated sillicon rubber straight through joint

Straight Through/Insulating Joint

Product Introduction

Our company produces CN-YJJTI prefabricated silicone rubber insulated straight through joint and CN-YJJJI prefabricated silicone rubber insulating joint, applied to connect two identical or similar  cross sections of the cable. 

They are composed of prefabricated insulating main body (including stress cone), metal protective sheath and fiberglass outer protective sheath. 

The prefabricated silicone rubber main body adopts imported liquid silicone rubber injecting forming which has long-term stability of lasting hold force and electric field uniform ability. 

Metal protective sheath is composed with two different lengths of metal tail tube and tubular insulating ring, filled with insulating sealant, and covered with insulating and sealing. 

The outer protective sheath of glass fiber reinforced plastics is in the outermost layer, filled with waterproof sealant which protects the mechanical properties, anti-erosion and sealing of middle joints, ensuring the safety of long run.

Our product is using multiple sealing structures which can effectively prevent the leakage of water immersion. All of the seals are using imported NBR or silicon rubber material. All of the fasteners are stainless steel with good waterproof seal performance. 

For different work environments and users’ specified requirements, metal protective sheath and fiberglass outer sheath are optional. In environments without water damage, mechanical damage or corrosion, there is no need to use outer metal protective sheath or fiberglass sheath, which is better for heat emission of the product to ensure long service life.

In environments with depth of water immersion of 0.5 meter, erosive materials and great possibilities of mechanical damage, please choose the metal protective sheath and fiberglass sheath, which is better for protect products. For the above two environments, one option can be chosen to ensure the stable and safe operation of middle joints in service life. 

        The cross sectional areas range of cables with supporting accessories of various voltages is as following:

    48/66kV~56/77kV 150~1400mm²;

     64/110kV~76/138kV 240~1600mm²;

     127/220kV~290/500kV 400~3000mm²  

Product Characteristics:

Compact structure: silicone rubber parts is using entirely prefabricated rubber insulator with small size compact structure, straight through and insulating joints share the same prefabricated part.

Easy installation: using advanced site dual installation, one machine to expand, another shrink in connection cable, greatly improving installation efficiency and reducing the labor. 

We also have the following products:

  Typical Drawings for connectors/terminatals/terminations:

 Other Products produced by us.

Workshops and Largest Testing Center in China in line of Cable Accessory

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Why choose us?

Export to many countries including Australia, New Zealand, UK and USA.

Best manufacturing and testing equipments imported from Germany, USA and Japan guarantee the best quality with competitive prices.

Professional overseas team guarantees you best pre-and-after sale services.

Experienced engineers and workers for more than 20 years ensure the quality and customized products.

5S Management to enhance the qualifications of staff and make better service for customers.

Near Shanghai and Ningbo Port workshop makes it convenient to delivery on time.

Produts Testing Certificates

 The main products cover all series of  1kV~35kV LV&MV cold and heat shrinkable cable accessories;66kV~500kV high& ultra-high voltage cable accessories which include porcelain bushing cable terminal ,composite bushing ,all prefabricated soft Silicone Rubber Dry Outdoor Terminal ,Rigid dry outdoor terminal, pluggable dry GIS terminal, straight joints, insulating joints, fully insulating and sealing dry Y Type branch joints, conversion joints, inter-connected boxes, grounding boxes, and other support equipments. Copper, aluminum, copper and aluminum transitional devices of 16 ~2500mm2;cable clamps; devices for peeling and straightening cables; cable conveyors for 300~800kg,pay-off stand , devices for pulling and moving; rubber insulating tapes,semi-conductive tapes, waterproof tapes,etc.On specific customer demand ,a full range of cable design services are provided.