Large-size electrode initial streamer stage space charge dynamic distribution calculation method

Abstract

The invention discloses a large-size electrode initial streamer stage space charge dynamic distribution calculation method. The method is characterized by comprising the following steps: S1) building a large-size electrode discharge process high-potential current and space electric field intensity combined monitoring platform under positive polarity operation impact, and collecting the discharge process high-potential current i (t) and space electric field intensity E (t) data; S2) performing time-sharing integration on the discharge current if (t) in the high-potential current i (t) to obtain the free charge increment delta Qf (t) injected into the positive electrode end at each moment in the initial streamer stage; S3) counting the space electric field intensity jump increment delta E (t) at each moment in the initial streamer stage, and obtaining the electric field intensity jump increment delta Es (t) caused by the space charge increment delta Qs (t) at each moment according to the charge conservation principle; and S4) inverting the space charge distribution condition at each moment by using a charge simulation method to obtain a dynamic space charge distribution change rule in the initial discharge streamer stage of the positive polarity large-size electrode. The method provided by the invention can lay a foundation for revealing a guide mechanism of space charges to streamer discharge development.

Description

technical field

[0001] The invention relates to the technical field of charge distribution calculation, in particular to a method for calculating the dynamic distribution of space charge in the initial flow injection stage of a large-scale electrode. Background technique

[0002] The pressure equalizing shielding ball is an important fitting in the valve hall of the converter station. The radius is generally 0.25m to 1m. The discharge characteristics of the air gap formed by it and the surrounding grounding body are similar to the long air large-size ball-plate gap. Compared with the previous air gap types such as rod-plate and rod-rod, the large-size electrode presents the remarkable characteristics of larger corona surface area, denser space charge, and more random discharge start position. The dynamic distribution of space charge in the discharge process is a key physical parameter for analyzing the characteristics of the streamer, so it is necessary to study the dynamic ...

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