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Heat release welding process for grounding electrode facility of power grid direct current engineering

A technology of exothermic welding and DC engineering, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of low resistivity of welding joints, achieve low resistivity, improve project quality, and solve difficulties and defects.

Inactive Publication Date: 2011-05-11
国家电网有限公司特高压建设分公司
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Problems solved by technology

[0012] The invention provides a low-resistivity welding head and corrosion-resistant exothermic welding process for the grounding electrode facilities of the DC project of the power grid, which improves the connection process between the grounding bodies of the traditional grounding system and improves the overall engineering quality. Greatly solved the difficulties and defects of the ground electrode feed rod in the welding construction

Method used

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Embodiment Construction

[0038] The exothermic welding process used for grounding pole facilities of power grid DC projects can be used for welding between grounding rods and grounding wires. The main tools used are: welding molds, welding mold clips, welding powder, ignition guns, brushes, steel brush, butane blowtorch.

[0039] Before each start of work, use heating tools such as a drying box or blowtorch to dry the mold to remove moisture, and then use a soft brush or other soft objects to clean the mold. If the size of the welded object is smaller than the mold nameplate, in order to avoid copper Liquid leakage can be compensated by the following methods: a) use copper casing with appropriate thickness; b) use copper sheet or copper strip; c) use sealant; d) use high temperature cotton tape.

[0040] Clean the mold and the surface of the conductor and ground electrode to be connected with a flexible object.

[0041] End-to-end exothermic welding of two steel rods of ￠60 or other specifications an...

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Abstract

The invention relates to a heat release welding process for a grounding electrode facility of power grid direct current engineering, which is used for welding a grounding rod. The heat release welding process comprises the following steps of: carrying out cleaning, drying and deoxygenization treatment on the surface of the wending end part of a steel rod; then carrying out heating treatment on the welding end part and the adjacent part of the steel rod by a blow lamp; drying a die and removing steam by adopting a heating tool; installing the welding end part of the steel rod to the corresponding position of the die and ensuring the tightness of the contact surface of the die; and igniting for carrying out heat release welding. A welding head obtained by the heat release welding process for a grounding electrode facility of power grid direct current engineering has low resistivity and corrosion resistance. The heat release welding process improves the connecting process among grounding bodies of the traditional grounding system and integral engineering quality and overcomes the difficulty and defects of a grounding electrode feed rod in the welding construction to a great extent.

Description

technical field [0001] The invention belongs to the welding technology of the ground electrode of the DC engineering of the power grid, and in particular relates to an exothermic welding process for the ground electrode facility of the DC engineering of the power grid. Background technique [0002] The grounding electrode in the HVDC transmission system plays an important role in the normal operation of the entire DC transmission system. In the power system, the technical performance of the grounding system, such as connection strength and grounding resistance, directly affects the safety and reliability of the entire system. Therefore, the material selection and process of the grounding system are very important in the entire power system. In the past, the grounding material in the domestic DC grounding electrode grounding system usually used steel, and the form was mostly steel rod electric welding. This electric welding connection method requires high technical level of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
Inventor 关金锁刘良军王立国
Owner 国家电网有限公司特高压建设分公司
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