ABB 70AA02B-E HESG447388R1

   1、按正常工作条件选择设备

    （1）额定电压和最高工作电压：所选电气设备的允许最高工作电压Ualm不得低于所接电网的最高运行电压Usm，即

    Ualm≧Usm或UN≧UNS

    这是因为，一般电气设备的允许最高工作电压：

    ①220kV及以下，Ualm=1.15UN；

    ②330kV及以上，Ualm=1.10UN。

    而实际电网最高允许电压：Usm=1.10UN

    （2）额定电流：在额定环境温度下，设备长期的允许电流IN，应不小于各种正常运行方式下的最大持续工作电流Imax，即

    IN≧Imax

    2、按短路情况校验

    ⑴短路热稳定校验

    条件：It2t≧Qk

    ⑵短路动稳定校验

    条件：ies≧ish或Ies≧Ish

    下列情况不校验热稳定或动稳定

    ⑴用熔断器保护的设备，可不校验热稳定；

    ⑵采用有限流电阻的熔断器保护设备，可不校验动稳定；

    ⑶装设在电压互感器回路的裸导体和设备，可不校验热稳定和动稳定。

    注意：短路按三相短路；短路点按通过电流最大；短路时间按最严重开断短路电流时间。

    3、短路计算条件

    a、容量与接线。容量：安工程设计最终容量计算，并考虑电力系统远景发展规划；接线：采用可能发生最大短路电流的正常接线方式，但不考虑在切换过程中可能短时并列的接线方式。

    b、短路种类。一般按三相短路验算，若其它种类短路较三相短路严重时，则应按最严重的情况验算。

    c、计算短路点。选择最严重情况的短路点，即通过电器设备的短路电流最大

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