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Our stringent quality policy enable us to deal, supply and wholesale highest quality medium Voltage Joint Systems. These Medium Voltage Cable Joints are obtained from established manufacturers and suppliers for ensuring reliability and durability of Shrinkable Medium Voltage Joints. Millions of Raychem Heat Shrinkable Medium Voltage Joints have been installed on paper and polymeric cables worldwide. These installations are performed in the most severe service conditions and under high electrical, thermal, mechanical and environmental stresses.
Product Features and Benefits
- Heat-shrink technology
- Prefabricated components
- Easy and highly reliable installation
- Applicability to different conductor and connecting techniques
- Accommodation of tolerances, range-taking
- Suitable for different conductor cross sections and cable constructions
- Solutions for all cable constructions
Design of Joints
These connectors are isolated from heat and sealed with thick-wall, heat-shrinkable tubings and mastic. The armour or copper tape shielding is rebuilt with a wraparound metal case or with copper mesh. Solderless earth connection offers electrical connection to the armour or copper shielding. The outer protection and sealing is performed by adhesive coated heat-shrinkable tubing. Joints type POLJ are supplied with mechanical connectors, joints type EPKJ and SMOE are supplied without connectors.
A Universal System
Cable preparation and installation techniques for Raychem high voltage joints are similar to Raychem heat-shrinkable terminations. The Similar basic design is also shared by Raychem joints for paper insulated cables. In this respect too, the heat-shrinkable system sets new standards of efficiency and simplicity.
Electrical Field Control
The stress control tubing has accurately explained impedance characteristic which smoothens the electrical field over connector and cable screen ends. During installation of tubing, its shrinking action compresses the special void filler (yellow) into position round the screen ends and connector. Pencilling of insulation at the connector is not necessary.
Product Design
The design of a single-core joint for polymeric insulated cable is described here. The same design principles are used for 3-core and paper insulated cables.
Insulation and Screen
The elastomeric sleeve gives accurate thickness of insulation (red) in one step. The insulation screen is given by the outer wall of the sleeve, which is of heat-shrinkable conductive polymer (black). This technique saves installation time and ensures flawless bond between joint insulation and screen.
Mechanical Strength
For steel wire or tape armoured cables. Raychem joints incorporate a light-weight impact-resistant galvanized steel joint case which is quick to install and provides earth fault current capacity.
Outer sealing:
Heat used to shrink the outer sleeve causes pre-coated adhesive to melt and flow, resulting in lasting moisture and corrosion barrier on the cable oversheath.
Metallic shielding
Tinned copper mesh of adequate cross-section provides electrical continuity of insulation shield across the connection area.
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