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发明授权
CN105244856B 一种防止PT断线引起距离保护误动的方法 有权

一种防止PT断线引起距离保护误动的方法
摘要：
本发明涉及一种防止PT断线引起距离保护误动的方法，测量开关合闸前后的三相电压幅值，当同时满足三个相电压中任意一相电压合闸前的电压值的绝对值小于门槛值K、该相电压合闸后的电压和合闸前的电压差值的绝对值也小于门槛值K，则判定PT断线，其中，0.01≤K≤0.1V；若已判断PT断线，实施闭锁距离保护。本发明解决了当PT断线时，造成距离保护误动的问题。
摘要（英）：

The invention relates to a method for preventing a distance protection misoperation caused by PT line breakage. Three phases of voltage amplitudes before and after a switch is closed are measured; when the conditions that an absolute value of a voltage value of any phase of voltage in the three phases of voltage before closing is less than a threshold value K, and the absolute value of a difference between the phase of voltage after closing and the phase of voltage before closing is also less than the threshold value K are simultaneously met, the PT line breakage is judged, wherein K is less than or equal to 0.1V and greater than or equal to 0.01V; and if the PT line breakage is judged, a blocking distance protection is carried out. According to the method, the problem of the distance protection misoperation in the PT line breakage is solved.

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