The live working of the distribution line can be classified by insulation or by the insulating tools used.
1. The indirect operation method is an operation method in which an insulating tool is mainly insulated and an insulated wearing device is used as an auxiliary insulation.
This method of operation refers to a method in which an operator maintains a sufficient safety distance from a charged body and works by an insulating tool. Moreover, the parts of the human body are kept away from the charged body and the grounding body by the insulating protective device (insulated gloves, insulating clothes, insulated boots), and the human body is not at the ground potential. Therefore, the working mode should not be mistakenly called the ground potential working method.
2. The direct operation method refers to the method in which the operator directly approaches the electrified body by means of the insulating arm or the insulating ladder of the aerial work vehicle, and the parts of the human body are directly insulated by wearing the insulating protective tools. This method of operation should not be called equipotential method in name, because the human body and the charged body are not equipotential when working with insulated gloves.
In the live working of the distribution line, whether it is the direct operation method or the indirect operation method, if it is divided according to the human body potential of the operator, it belongs to the intermediate potential operation method.
3. According to the insulation tools used, in the live working of the distribution line, according to the main insulation tools used, the commonly used operation methods are as follows: 1.2.1 On-rod insulation tool operation method (Foot buckle, etc.) Ascend to the appropriate position, fasten the seat belt, maintain a safe distance from the system voltage, and then apply the insulation rod with different tool attachments at the end. When adopting the working method, the insulating insulation tool, the insulating glove and the insulating shoe constitute a longitudinal insulation protection between the charged body and the ground, wherein the insulating tool functions as a main insulation, and the insulating shoe and the insulating glove serve as an auxiliary insulation; Insulating shield, the insulating suit constitutes the transverse insulation protection between the charged body and the person or between different phases of the charged body, so as to avoid phase-to-phase short circuit or relative short circuit due to excessive human action. The operation method is characterized by being unrestricted by traffic and terrain conditions, and can be operated at a pole position that cannot be reached by a high-altitude insulated bucket car. However, the mobility, convenience and aerial work range are not as good as the insulation of the arm. The on-site monitoring and management personnel should mainly monitor the safety distance between the human body and the charged body and the minimum effective length of the insulating tool. The electrical insulation strength and mechanical strength of the tools used should be strictly checked before operation.
4. Insulation platform operation method The insulation platform usually consists of an insulated ladder, a single-legged ladder, and an insulated body. The operator can work either by indirect method with insulating tools or by direct method with insulating gloves, and the insulating platform acts as the main insulation between the ground. Regardless of whether it is an indirect method or a direct operation method, in general, insulation shielding and isolation tools should be used to shield or isolate adjacent phase charged bodies before carrying out operations on the serviced phase. At the same time, workers should wear a full set of insulating protective equipment. When working directly through insulated gloves, rubber-insulated gloves should be covered with protective gloves that are worn or pierced.
5. The operation method of the insulated bucket arm vehicle adopts the insulated bucket arm vehicle for live working, and has the advantages of convenient lifting, strong maneuverability, large working range, high mechanical strength and good electrical insulation performance. Insulated arm vehicles with live working have been developed in Europe and the United States since the 1930s. In the 1950s, they were widely used in live working of transmission and distribution lines. The insulating arm of the insulated bucket arm is made of glass fiber reinforced epoxy resin and is wound into a cylindrical or rectangular cross-section structure. It has the advantages of light weight, high mechanical strength, good insulation performance and strong water repellency. Provides relative insulation protection for the human body. Insulation buckets are single-layer buckets, and some are double-layer buckets. The outer bucket is generally made of epoxy glass reinforced plastic, and the inner bucket is made of PTFE. The insulation bucket should have high-strength electrical insulation, and together with the insulation arm, form a longitudinal insulation between the opposite sides, so that the leakage current of the whole vehicle is less than 500 foundation. At the same time, if the insulation bucket touches the two-phase wire at the same time, no flashover of the surface should occur.
The positioning of the working bucket of the insulated bucket car is directly operated by the operator in the upper bucket of the insulating arm, and some are controlled by the personnel on the lower driver's seat, and some of the upper and lower sides of the working vehicle can be hydraulically controlled. The working bucket has horizontal and vertical rotation functions, which can be moved horizontally or vertically by parallel wires or poles. The use of high-altitude insulated bucket trucks for live working on the distribution network is a convenient, flexible, wide-ranging application and low labor intensity.
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