Anti-explosion safety design method of skin-effect anti-explosion power supply junction box

Abstract

The invention relates to an anti-explosion safety design method of a skin-effect anti-explosion power supply junction box, which comprises a cable lead-in device, an element lead-out device, an input three-core cable, a shell, a connection terminal, anti-explosion insulation plaster, a skin-effect heating element and a high-temperature electric wire. The method comprises the following steps of: 1. preferentially taking actual skin-effect thickness to realize the personnel safety and economical efficiency; 2. enabling the maximum surface temperature of the shell to reach a specified anti-explosion value by raising the temperature in a connecting line cavity; 3, guaranteeing the anti-explosion performance of the connecting line cavity by using an isolation structure to cut off the gap of the connecting line cavity; 4. guiding static to a ground protection insulation layer by using an arc extinction electric wire; 5. meeting the anti-explosion requirements on electric clearance, creep age distance, insulation material comparative tracking index classification, and protection grade; 6. achieving electrical safety protection function and meeting the anti-explosion electrical safety requirement by arranging a grounding protection device on the surface. The invention solves the problems of the design of structure, installment and safety technology of anti-explosion power supply junction boxes in dangerous places and areas in an explosive atmosphere.

Description

technical field [0001] The invention relates to an explosion-proof safety design method for an explosion-proof power junction box of a skin-effect electric heating element on a long-distance pipeline. Background technique [0002] As we all know, long-distance pipelines are the "lifeline" of pillar industries such as petroleum and chemical industry, and the main artery of the national economy. For oilfield long-distance pipelines, port long-distance pipelines, chemical plant long-distance pipelines, natural gas long-distance pipelines, etc., in order to ensure that the "medium" in them exceeds the ambient temperature for normal production flow and operation, it is required to maintain the surface temperature of long-distance pipelines. One or several "skin effect electric heating elements" are installed axially between the surface of the pipeline and the insulation layer to play the role of heat tracing and compensation heat. The length of the skin effect electric heating e...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an explosion-proof and safe design method for the skin effect electric heating element and the skin effect explosion-proof power junction box on the long-distance pipeline. The connection between the AC power cable and the skin effect electric heating element, and solves the safety technical problem in the area where the power junction box is located in the hazardous area of ​​explosive gas atmosphere

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