Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

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To change the current cutting speed can press the Enter key, so that the current speed of display brightness, enter a new speed value, and then press the Enter key to accept the input speed controller.

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To change the current cutting speed can press the Enter key, so that the current speed of display brightness, enter a new speed value, and then press the Enter key to accept the input speed controller.

按下&回到路徑&鍵亚洲又黄的A片，切割機將將回到原路徑的點上，這個功能對檢查或替換設備的部件時非常有用YouJizz丰满熟妇短视频。

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Fault Analysis and Treatment: An estimated following reasons: 1 self-completion computer emerged in the interface when activated by pressing the reset button, will appear in the start menu option to start, and the default choice is the safe mode, if the Press key, the system will enter the safe mode, restart the computer only needs to enter to the normal mode; 2 The system file is damaged or subjected to virus infection, resulting in Windows98 operating system can not enter into normal mode, can only enter the Safe Mode.

故障分析與處理：估計有以下幾種原因：1）電腦在自檢完成出現(xiàn)啟動界面的時候按下了復位鍵欧日XX片，在啟動時會出現(xiàn)啟動菜單選項，并且默認選擇的是安全模式国产手机小视频看片，如果此時按鍵真人在线视频一区，系統(tǒng)便會進入安全模式，只需要重新啟動電腦即可進入到正常模式天天爽天天日天天操；2）系統(tǒng)文件被破壞或遭受病毒感染性欧美丰满XXXX性，造成Windows98操作系統(tǒng)不能進入到正常模式，只能進入安全模式cao免费在线视频官网。