Partial discharge model of stress cone dislocation in 10kv cable intermediate joint
A cable intermediate joint, partial discharge technology, applied in the field of power system, can solve the problems of the difference of the real discharge characteristics of the joint and the inability to ensure the safety of the model.
Active Publication Date: 2017-01-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0004] At present, a lot of research has been done on the discharge characteristics of insulation defects in cable intermediate joints at home and abroad, but most of the research on the discharge characteristics of typical defects is not carried out on the actual cable joints, which are different from the real discharge characteristics in the joints.
And if you really choose a defective cable, you can not ensure the safety of this model
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Embodiment Construction
[0018] 10kV cable intermediate joint stress cone dislocation partial discharge model, including two cables 1 connected together, the cables 1 peel off the shielding layer 11, outer semiconducting layer 12, main insulating layer 13, inner conductive layer 14 layer by layer, exposing copper Core 2; the copper cores 2 of the two cables 1 are connected through a crimping tube 3, the outer side of the copper core 2 and the crimping tube 3 is covered with a semi-conductive sheath 4, and the outer side of the stripped part of the cable 1 is provided with a stress cone 5 , wherein the fracture of the outer semiconducting layer 12 of one cable 1 protrudes out of the stress cone by at least 5 mm to form a dislocation.
[0019] The semiconductive sheath layer 4 is a semiconductive tape or a semiconductive plastic sheath. The semi-conductive tape is wrapped from the shielding layer of one cable 1 to the shielding layer 11 of the other cable 1 . The junction of the main insulating layer 1...
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The invention aims at providing a partial discharge model for staggering of a stress cone of a 10kV cable intermediate joint. Common XLPE (cross-linked polyethylene) cables are directly used for manufacturing a model which can really reflect problems which are exposed during manufacturing, installation and operation of a cable intermediate joint under the situation that safety is guaranteed. In order to solve the technical problem, the technical scheme is that the partial discharge model for staggering of the stress cone of the 10kV cable intermediate joint comprises two cables which are connected together, and shielding layers, outer conducting layers, main insulating layers and inner conducting layers of the cables are stripped layer by layer to expose copper cores; the stress cone is sheathed on the outer side of the stripped parts of the cables, and the fracture of the outer semi-conductive layer of one cable stretches out of the stress cone for at least 5mm to form staggering. Compared with the prior art, since a defective part is artificially manufactured in the real cable intermediate joint, the properties, the characteristics and the discharge mechanisms of representative defects exposed during manufacturing, installation and operation of the cable intermediate joint can be really reflected.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a stress cone dislocation partial discharge model of a 10kV cable intermediate joint. Background technique [0002] XLPE cables are widely used in transmission lines due to their excellent performance. However, the length of cables is generally less than 1km, and cable intermediate joints are required for connection. Therefore, cable intermediate joints are an important part of power cables, but they are also frequent sites of transmission line accidents. , its reliability directly affects the security of the power supply system. During on-site installation, various defects may be introduced into the cable accessories due to improper operation, causing serious damage to the accessories. The partial discharge of the cable is closely related to its insulation condition, and the change of the partial discharge indicates that there may be defects in the cable insulation that may endange...
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IPC IPC(8): G01R31/12G01R31/04
Inventor 卢晓峰应高亮张波葛爱莉钟伟胡铁红王欣昱金伟君李文斐徐志斌
Owner STATE GRID CORP OF CHINA