The charge simulation technique (CST) was applied for computing the electric field in long space-charge-free rod-to-plane gaps with G (=gap-spacing to rod-radius) ratio in the range of 50-500. In this article, a new formation of CST is proposed for computing the electric field in short positively stressed rod-to-plane gaps characterized by G in the range of 2-160 and gap spacing up to 8 cm, provided that the gap can accommodate space charges. This is a prerequisite for computing the inception voltage of different corona modes, including burst pulses (BP), onset streamers (OS), and positive glow (PG). The criteria developed before for computing the inception voltage of BP and OS are refined for short rod-to-plane gaps. However, the inception criterion for PG cannot be extended to short gaps. A method is proposed for calculating the inception voltage of PG in short rod-to-plane gaps in the air at room temperature. The initiatory electrons for burst avalanches are produced by photoionization inside the ionization zone rather than by detachment of negative ions as experienced in long gaps. The resulting BP merges in time to form the steady glow at the rod surface in conformity with Loeb's postulate. The computed inception voltage of BP, OS, and PG agreed reasonably with those measured experimentally for short rod-to-plane gaps.

中文翻译：

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突发脉冲的起始电压、起始流光和短杆面间隙中的正辉光


应用电荷模拟技术 (CST) 来计算长无空间电荷棒平面间隙中的电场，G（=间隙间距与棒半径）比率在 50-500 范围内。在本文中，提出了一种新的 CST 形式，用于计算短正应力棒平面间隙中的电场，其特征为 G 在 2-160 范围内，间隙间距高达 8 cm，前提是间隙可以容纳空间费用。这是计算不同电晕模式的起始电压的先决条件，包括突发脉冲 (BP)、起始流光 (OS) 和正辉光 (PG)。之前制定的计算 BP 和 OS 起始电压的标准针对短棒平面间隙进行了细化。然而，PG 的起始标准不能扩展到短间隙。提出了一种计算室温空气中杆面短间隙中PG起始电压的方法。爆发雪崩的起始电子是通过电离区内的光电离产生的，而不是像长间隙中那样通过负离子的分离产生的。由此产生的 BP 及时合并，在棒表面形成稳定的辉光，符合勒布的假设。计算出的 BP、OS 和 PG 的起始电压与短棒平面间隙的实验测量值相当一致。