Research And Test On Low Temperature Characteristics Of Overhead Conductor Insulation And Its Stripping Scheme

Conductors with polyethylene insulation are usually used to transmit electrical energy on urban overhead distribution lines.In order to adapt to the development of the city,it is usually necessary to draw branch lines from the existing distribution lines.When constructing branch lines,workers are usually required to select a suitable position from the complete wire to strip off a piece of polyethylene insulation,exposing the metal core of the wire,and then pass the metal core of the branch line and the metal core of the existing wire through the hardware.Do parallel connection.At present,the main method of stripping a section of insulation on insulated distribution wires is mechanical stripping by rotating a specific tool.The mechanical stripper has problems such as damage to the surface of the metal core of the wire,poor operability,and high requirements for workers.Therefore,it is necessary to explore and research a new type of stripping wire that can adapt to a wider temperature range,is not easy to damage the wire metal,and is environmentally friendly.Schemes and devices for insulating skins.In this paper,low-temperature uniaxial compression experiments are carried out mainly for polyethylene,a commonly used base material for insulated wires,and a scheme design of a low-temperature insulation stripper is carried out.The feasibility of the scheme is verified by finite element simulation and wire stripping experiments.Firstly,polyethylene samples were made,and low-temperature uniaxial compression experiments were carried out on polyethylene.The elastic modulus,yield strength of polyethylene at different temperatures,and the deformation and load conditions that the polyethylene samples should meet when they were crushed were obtained.The crushing forms of the samples at different temperatures were studied;secondly,based on the low-temperature embrittlement characteristics of the insulating material,the overall scheme of the lowtemperature insulation wire stripper was designed.The freezing and stripping part completes the work of stripping the embrittled insulation.In order to avoid the influence of low temperature on the stripped part,the two parts are designed separately and do not interfere with each other;then,the thermal stress of the insulated wire is analyzed with the help of ANSYS Workbench software,and the refrigeration is obtained.The distribution of the temperature field in the wire segment during the freezing process of the agent was obtained,and the temperature changes at different positions inside the wire in the time history during the freezing process were obtained.The tool design scheme verifies the influence of low temperature conditions on the wire insulation;finally,by using the produced tool model to carry out low temperature stripping experiments on the insulated wire,the stripping effect of different tool models on the wire is obtained,and the results of different temperatures are obtained.Stripping effect,qualitative analysis of the stripped wire and stripped insulation,which proves the feasibility of designing the stripper based on the low temperature embrittlement characteristics of insulating materials proposed in this paper.