电器与能效管理技术 ›› 2021, Vol. 0 ›› Issue (5): 5-8.doi: 10.16628/j.cnki.2095-8188.2021.05.002

• 研究与分析 • 上一篇    下一篇

直流与交流分断特性的对比研究

龚祚勇, 向洪岗   

  1. 上海良信电器股份有限公司, 上海 201206
  • 收稿日期:2020-12-14 出版日期:2021-05-30 发布日期:2021-06-15
  • 作者简介:龚祚勇(1984—),男,工程师,主要从事低压电器研究与开发。|向洪岗(1978—),男,工程师,博士,主要从事低压电器研究。

Comparative Study of DC and AC Breaking Characteristics

GONG Zuoyong, XIANG Honggang   

  1. Shanghai Liangxin Electric Co.,Ltd., Shanghai 201206, China
  • Received:2020-12-14 Online:2021-05-30 Published:2021-06-15

摘要:

在评估直流分断能力和低频交流分断能力时,业内存在的普遍看法是由于交流电存在自然过零点,针对同样的电压和预期短路电流,故交流比直流更容易分断。通过试验,对比分析了直流分断与不同频率交流分断的难易程度,特别是与低频交流分断能力的比对,得出随着交流频率的降低,交流分断的难度完全可能高于直流。

关键词: 直驱型风机, 直流分断能力, 交流分断能力, 分断能力比对, 自然过零

Abstract:

In the evaluation of DC breaking capacity and low frequency AC breaking capacity,there are general opinions in the industry:AC is easier to break than DC for the same voltage and expected short-circuit current due to the existence of natural zero crossing point of AC.This paper compares and analyzes the degree of difficulty of DC breaking and AC breaking at different frequencies,especially the comparison with AC breaking capacity of low frequency.It is concluded that with the decrease of AC frequency,AC breaking is more difficult than DC.

Key words: direct drive fan, DC breaking capacity, AC breaking capacity, breaking capacity comparison, natural zero crossing

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