短路计算讲义（英文）

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发表于 2012-3-24 14:43:08 | 显示全部楼层 |阅读模式

课件讲义
课件讲义名称:	短路计算讲义（英文）
内容简介:	To begin, we introduce a common way of referring to time that you may not have heard used yet. Time is measured in “cycles” where 1 cycle=1/60 of a second=0.0167 second.
媒体:	电子文档
所属专业方向:	电力系统
制作者:
来源:

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本帖最后由 fifine 于 2012-3-24 14:44 编辑

A “fault” refers to a short circuit in a power system. Faults can be divided into two broad classes: temporary and permanent faults.

Temporary faults cause momentary disruption, but the fault is cleared without protection operation. The most common type of temporary faults are those from lightning.

Permanent faults cause sustained disruption if not cleared by protection. The most common permanent fault types are associated with one or more of the following

1.Wind

2.Ice loading

3.Thermal heating and sag

4.Various “rare” events such as:

a.0 L* I* |: ?- q: k
Trees growing into line

b.Automobile striking tower

c.% ]' I# z; n z
Earthquakes

d.Flooding

e.
; `* y- Q, V! r& gAirplanes