Porcelain bushing type direct current field PLC/RI capacitor

Abstract

The invention discloses a porcelain bushing type direct current field PLC / RI capacitor. The capacitor comprises a pedestal and a high-voltage electric porcelain bushing which is vertically fixed on the pedestal, wherein a plurality of capacitor elements which are immersed in a liquid insulating medium and connected with each other in series are arranged in the high-voltage electric porcelain bushing; the plurality of capacitor elements which are connected in series are averagely divided into several serial sections with as many capacitor elements as each other; each serial section is connected with a resistor with the same resistance in parallel; the upper end of the high-voltage electric porcelain bushing is provided with a sealing cover which is provided with an external oil-filled expander; the upper end of the external oil-filled expander is provided with a sealing cover and a high-voltage wiring board; and the lower end of the pedestal is provided with a low-voltage connecting terminal. A porcelain bushing type structure is adopted by the porcelain bushing type direct current field PLC / RI capacitor of the invention, namely the high-voltage electric porcelain bushing is adopted as a product shell, and the high-voltage electric porcelain bushing is also used as a supporting insulator, so that the cost for additionally arranging the supporting insulator is saved. By rational space arrangement, the area occupied by the entire capacitor is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission systems, and relates to a filter capacitor, in particular to a porcelain sleeve type direct current field PLC / RI capacitor used for direct current transmission system filtering. Background technique [0002] With the rapid development of our country's economy, it has driven the rapid growth of the electric power industry, and at the same time, the irrational structure of the power supply has become increasingly serious. my country mainly uses coal-fired thermal power and hydropower. In terms of geographical distribution, most of the hydropower and coal resources are concentrated in the western region, but the load centers are concentrated in the eastern coastal areas of my country. The contradiction of geographical distribution is becoming increasingly prominent. At the same time, the capacity expansion of the 500KV power grid all over the country also encountered the problems ...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the existing DC field PLC / RI capacitors in China are tower structures or iron shell units such as figure 1 As shown, in order to meet the requirements of external insulation, the equipment of this type of structure needs to support insulators, the equipment cost is high, and the floor area is large; and the required capacitance value of the equipment is small, and the tower structure is used, which wastes a lot of materials

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