Direct-current transmission conductor dirt evaluation method and system

Abstract

The invention discloses a direct-current transmission conductor dirt evaluation method and system. Particulate matter will attract charged ions to become new charged corpuscles, and consequently an ion flow field of a direct-current transmission conductor becomes more complicated. The evaluation method comprises the steps that a to-be-evaluated conductor is selected, and air pollution indexes in atransmission conductor area and rainfall meteorological data in a corresponding time period in a to-be-evaluated conductor area are collected; for a whole dirt accumulation process, an accumulation-cleaning model is adopted to calculate the accumulation condition of pollution particles around the conductor on the conductor; the accumulation condition obtained through calculation is substituted into the accumulation-cleaning model, and a conductor dirt cleaning condition in the corresponding time period is obtained and converted into equivalent salt deposit density; and the equivalent salt deposit density is compared with standard salt deposit density, and the dirty level of the current direct-current transmission conductor is judged. According to the direct-current transmission conductordirt evaluation method and system, the changing condition of the ion flow field on the surface of the conductor is calculated through the air pollution indexes and the meteorological data and then converted into the changing condition of equivalent salt deposit density, and therefore the dirty condition of the conductor is judged.

Description

technical field [0001] The invention relates to the field of pollution evaluation of direct current transmission wires, in particular to a pollution evaluation method and system for direct current transmission wires based on air pollution index. Background technique [0002] Compared with AC transmission, DC transmission can effectively save the cost of transmission wire corridors in the case of long-distance and large-capacity transmission, and can reduce transmission bottlenecks encountered in the transmission process and harm to the environment. Compared with traditional AC power transmission has obvious advantages in economic and social benefits. In recent years, DC transmission projects have developed rapidly in my country. [0003] The corona discharge that occurs during power transmission is a phenomenon in which the air medium is ionized and discharged when the potential gradient value on the surface of the wire exceeds a critical value. After the corona discharge ...

AI Technical Summary

Problems solved by technology

When the corona discharge occurs on the DC transmission wire, unlike the AC transmission wire, the voltage of the DC transmission wire is a constant value, so the charged particles will move directional in the surrounding field, and the surrounding particles will be polarized after being polarized. Affect the field strength distribution of the original field, and if there are other particles in the space, the particles will absorb charged ions and become new charged particles, making the ion flow field of DC transmission wires more complicated

Such a coupling field will further affect the movement of surrounding particles, which in turn will affect the pollution accumulation of the transmission line

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