本文在建立时间继电器一般数学模型的基础上，提出了实现定时限，变时限两类数字式时间继电器的子程序流程图；
The paper develops a general mathematical model of time delay relays and gives the subprogram flow charts to realize definite and variable time delay relays with a computer.
利用MATLAB仿真软件建立了典型的配电网模型、直接并网及逆变并网两类分布式电源模型。详细阐述距离保护的保护原理和整定原则。
Distribution systems model and DG model are built in MATLAB. The theory and setting principle of distance protection are introduced in detail.
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