Cold Shrink Cable Accessories / Medium & Low Voltage Cable Joint
Waterproof intermediate joint
Model:
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Description
The exterior of the waterproof intermediate joint is provided with water-blocking structural layers on the intermediate joint main body layer, inner sheath, and outer sheath respectively to achieve overall radial water blocking; at the connections between different interfaces, high-viscosity water-blocking materials are supplemented to enhance axial waterproofing. The interior of the waterproof intermediate joint adopts high-efficiency water-blocking materials and cable-core water-blocking technology. The materials have excellent conformability, creep property, and adhesion. Under the premise of water ingress into the cable core, the internal water-blocking materials can vary with the water volume to ensure waterproof performance, and the water-blocking performance does not change with time or operating temperature. The internal water-blocking structure is composed of conductive materials, stress control materials, and insulating materials. Among them, the conductive material has high conductivity, good adhesion to metal and PE, no water absorption, good conformability, and no hardening. Its function is to restore the inner semiconductive layer of the conductor, achieve long-term water blocking at the conductor screen break, and prevent water in the cable core from overflowing. The stress control material has stable performance and good adhesion to metal and PE. Its function is to equalize the electric field distribution and control the electrical stress on the surface of the inner semiconductive layer. The insulating material has a dielectric constant similar to that of cable insulation and good adhesion to PE and SR. Its function is to enhance the insulation performance at the intermediate connection, weaken the interface effect, and restore the internal water blocking of the joint. The waterproof intermediate joint features internal and external bidirectional water blocking at the intermediate joint position, excellent electrical performance, and convenient installation. Product features: Water-blocking materials: 1. Conductive material: high conductivity, good adhesion to metal and PE, no water absorption, good conformability, creepable, stable water-blocking and electrical performance. 2. Stress control material: stable performance, good adhesion to metal and PE. 3. Insulating material: dielectric constant similar to that of insulation, elongation at break.
Features
- Externally, the waterproof intermediate joint is provided with water-blocking structural layers at the intermediate joint body layer, inner protective layer, and outer protective layer, respectively, achieving overall radial water blocking; at connections between different interfaces, highly viscous water-blocking material is added to enhance axial waterproofing. Internally, the waterproof intermediate joint adopts high-efficiency water-blocking materials and core water-blocking technology. The materials have superior conformability, creep, and adhesion properties. Under the condition of water ingress into the cable core, the internal waterproofing materials can change with the water volume to ensure waterproof performance, and the water-blocking performance does not change with time or operating temperature. The internal water-blocking structure is composed of conductive material, stress-control material, and insulating material. Among them, the conductive material has high conductivity, good adhesion to metal and PE, no water absorption, good conformability, and does not harden. Its function is to restore the conductor inner semiconductive layer, achieve long-term water blocking at the conductor screen break, and prevent water in the cable core from leaking out. The stress-control material has stable performance and good adhesion to metal and PE. Its function is to equalize the electric field distribution and control the electric stress on the surface of the inner semiconductive layer. The insulating material has a dielectric constant similar to that of cable insulation and good adhesion to PE and SR. Its function is to enhance the insulation performance at the intermediate connection, weaken interface effects, and restore internal water blocking of the joint. The waterproof intermediate joint features bidirectional water blocking at the joint position from both inside and outside, superior electrical performance, and convenient installation. Product features: Waterproofing materials: 1. Conductive material: high conductivity, good adhesion to metal and PE, no water absorption, good conformability, creepable, and stable water-blocking and electrical performance. 2. Stress-control material: stable performance, good adhesion to metal and PE. 3. Insulating material: dielectric constant close to that of insulation, high elongation at break, good adhesion to PE and SR, etc. Water-blocking structure: 1. Increase insulation interface pressure and improve electric field distribution. 2. Enhance interface pressure and sealing performance at the insulation screen break, improving the external water-blocking effect. 3. Modify the structure and process at the conductor screen break to realize axial and radial water blocking inside the joint. Water-blocking process: 1. Lower requirements for the installation environment and broaden product adaptability. 2. Reduce dependence on installation techniques and improve product qualification rate.
Specifications
1Test procedure
2Test procedure
1.1AC withstand voltage test (117 kV, 5 min) / no breakdown
1.2Partial discharge test (45 kV) / ≤10 pC
1.3Impulse voltage test (95°C–100°C, 200 kV, 10 times each of positive and negative polarity) / no breakdown
1.4Constant-voltage load cycle test in air (65 kV. Water is injected into the conductor from the cable ends, and by adjusting the height of the ends, a water head of 1 m is maintained on the conductor at the intermediate joint. Heating cycle at least 8 h, conductor stabilized at 95°C–100°C for at least 2 h, natural cooling at least 3 h, 30 thermal cycles in total) / no breakdown
1.5Constant-voltage load cycle test in water (65 kV. Heating cycle at least 8 h, conductor stabilized at 95°C–100°C for at least 2 h, natural cooling at least 3 h, 30 thermal cycles in total. Water is injected into the conductor from the cable ends, and by adjusting the height of the ends, a water head of 1 m is maintained on the conductor at the intermediate joint. At the same time, the entire intermediate joint is immersed in water, with the water surface 1 m above the intermediate joint) / no breakdown
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1
2
Features
- Externally, the waterproof intermediate joint is provided with water-blocking structural layers at the intermediate joint body layer, inner protective layer, and outer protective layer, respectively, achieving overall radial water blocking; at connections between different interfaces, highly viscous water-blocking material is added to enhance axial waterproofing. Internally, the waterproof intermediate joint adopts high-efficiency water-blocking materials and core water-blocking technology. The materials have superior conformability, creep, and adhesion properties. Under the condition of water ingress into the cable core, the internal waterproofing materials can change with the water volume to ensure waterproof performance, and the water-blocking performance does not change with time or operating temperature. The internal water-blocking structure is composed of conductive material, stress-control material, and insulating material. Among them, the conductive material has high conductivity, good adhesion to metal and PE, no water absorption, good conformability, and does not harden. Its function is to restore the conductor inner semiconductive layer, achieve long-term water blocking at the conductor screen break, and prevent water in the cable core from leaking out. The stress-control material has stable performance and good adhesion to metal and PE. Its function is to equalize the electric field distribution and control the electric stress on the surface of the inner semiconductive layer. The insulating material has a dielectric constant similar to that of cable insulation and good adhesion to PE and SR. Its function is to enhance the insulation performance at the intermediate connection, weaken interface effects, and restore internal water blocking of the joint. The waterproof intermediate joint features bidirectional water blocking at the joint position from both inside and outside, superior electrical performance, and convenient installation. Product features: Waterproofing materials: 1. Conductive material: high conductivity, good adhesion to metal and PE, no water absorption, good conformability, creepable, and stable water-blocking and electrical performance. 2. Stress-control material: stable performance, good adhesion to metal and PE. 3. Insulating material: dielectric constant close to that of insulation, high elongation at break, good adhesion to PE and SR, etc. Water-blocking structure: 1. Increase insulation interface pressure and improve electric field distribution. 2. Enhance interface pressure and sealing performance at the insulation screen break, improving the external water-blocking effect. 3. Modify the structure and process at the conductor screen break to realize axial and radial water blocking inside the joint. Water-blocking process: 1. Lower requirements for the installation environment and broaden product adaptability. 2. Reduce dependence on installation techniques and improve product qualification rate.