220 kV porcelain jacket metal oxide arrester for high-altitude power system

Abstract

The invention relates to the technical field of high-voltage power systems, and particularly relates to a 220 kV porcelain jacket metal oxide arrester for a high-altitude power system. The 220 kV porcelain jacket metal oxide arrester comprises a grading ring, two arrester units, a metal backing plate and an insulating base, wherein the two arrester units are connected with each other in series by virtue of the metal backing plate, the grading ring is connected to the top end of the upper arrester unit, and a substrate is fixedly connected to the lower end of the lower arrester unit by virtue of the insulating base. According to the 220 kV porcelain jacket metal oxide arrester for the high-altitude power system, the structure is redesigned, and a reasonable internal resistor post and conductive rod support structure is adopted, so that potential distribution of the MOA for the high-altitude power system at a large creepage distance is effectively equalized, faults are avoided, and safe and stable operation of the high-altitude power system is obviously guaranteed.

Description

technical field [0001] The invention relates to the technical field of high-voltage power systems, in particular to a 220kV porcelain-coated metal oxide arrester for high-altitude power systems. Background technique [0002] Gapless Metal Oxide Arresters (hereinafter referred to as MOA) have been widely used in power systems due to their exceptionally good nonlinear characteristics. Among them, the MOA used in high-altitude areas requires the pollution level to reach E-level pollution, and the creepage distance is large, which is 7812mm. Therefore, the overall height of MOA needs to be higher than that of MOA in ordinary areas. If the MOA does not adopt a reasonable structure and effective voltage equalization measures, due to the existence of stray capacitance during operation, the continuous operating voltage borne by the resistors of the MOA unit near the high-voltage end will be higher than the voltage borne by the resistors far away from the high-voltage end. In turn, ...

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Problems solved by technology

If the MOA does not adopt a reasonable structure and effective voltage equalization measures, due to the existence of stray capacitance during operation, the continuous operating voltage borne by the resistors of the MOA unit near the high-voltage end will be higher than the voltage borne by the resistors far away from the high-voltage end. As a result, the aging speed of this part of the resistor is accelerated, and thermal collapse will occur in severe cases

[0003] At present, the structure and height of the 220kV porcelain-coated metal oxide arrester used in the high-altitude power system is unreasonable. The structure and height of the resistor column of the ordinary 220kV arrester are simply increased by increasing the height of the conductive rod to make up for the difference between the high-altitude type and the ordinary type. The overall height difference will cause the height mismatch between the internal resistor column and the conductive rod, the arrangement of the resistors is unreasonable, the overall potential distribution of the MOA is uneven, and even failure occurs

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