A kind of 550kv GIS inlet and outlet line porcelain bushing and its assembling method

Abstract

An inlet / outlet line porcelain sleeve pipe for 550kV GIS comprises an insulated porcelain sleeve and a shielding assembly. The insulated porcelain sleeve is of a hollow variable-diameter porcelain sleeve structure, the upper end face is sleeved with a conductor and a connecting component, and the lower end face is sleeved with the shielding assembly. The shielding assembly comprises a middle shielding cylinder, a grounding shielding cylinder, and a transition cylinder, and the whole shielding assembly is connected to the lower end face of the insulated porcelain sleeve through flanges. The upper part of the grounding shielding cylinder is fixed to the transition cylinder through a threaded connector. The middle shielding cylinder is concentrically sleeved in the grounding shielding cylinder, and is reversely fixed to the transition cylinder through four insulators and a threaded connector. The inlet / outlet line porcelain sleeve of the structure is assembled through insertion and groove welding and is connected and fixed by threaded connectors. Thus, products have excellent terminal static load performance, and have good insulation performance and temperature rise test results.

Description

technical field [0001] The invention relates to an overhead lead-out line device in the field of high-voltage power transmission and distribution equipment, in particular to an incoming and outgoing line porcelain bushing for overhead lead-out lines of a 550kV GIS tank circuit breaker and an assembly method thereof. Background technique [0002] GIS (Gas Insulated Substation) is the English abbreviation of gas-insulated fully enclosed combined electrical appliances. The GIS commonly used in the prior art is composed of circuit breakers, isolating switches, grounding switches, transformers, lightning arresters, busbars, connectors, and outlet terminals. These devices or components are all enclosed in grounded metal or ceramic shells. SF filled with a certain pressure 6 Insulating gas, so it is also called SF 6 Fully enclosed combined electrical appliances. Since the 1960s, GIS has been widely used in high voltage, ultra high voltage, ultra high voltage and other fields. C...

AI Technical Summary

Problems solved by technology

However, in the existing technology, most of the GIS inlet and outlet bushings are designed and produced by the switch manufacturers themselves, and the hollow porcelain sleeves used for the outer insulation are produced by various insulator manufacturers. Only a few manufacturers in the domestic electric porcelain industry carry out the overall assembly of the GIS inlet and outlet bushings. ; and although foreign PPC companies and Japanese NGK companies can produce special (ultra) high-voltage switch outlet porcelain bushings, they do not provide parts that match the GIS complete machine, and the constraints on related technologies are more serious.

In this way, the porcelain bushing, the main part of the inlet and outlet bushings, needs to be transported continuously, which causes great inconvenience and waste of resources

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