Principles and calculation method were described of polygonal line setting and positioning of new sample plot. Application programme was appropriate for field work and could increase work efficiency.
叙述了新设样地折线测设定位方法的原理及计算方法，编制了适合于外业调查使用的计算应用程序。
Setting calculation method of line differential protection and calculation examples are given as well.
最后结合实例总结了相关保护定值的整定计算方法。
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