该保护装置自具电源，基于热量累积原理实现快速高精度相电流反时限保护方法，实现对相电流和零序电流三段式保护。
The power of the protector is supplied by itself from the ct. Based on thermal cumulate principles, a rapid and high precision inverse-time phase-sequence over-current protection is implemented.
利用尺寸链原理对机器零部件尺寸及其误差进行综合与累积，是机器制造中质量分析的一个重要组成部分。
To make use of dimension chain principle in comprehensive and accumulated analysis of element parts size and error is an important composition part for quality analysis in machine building.
文章介绍了单个齿距偏差和齿距累积总偏差的测量原理，同时也介绍了相对法的测量方法。
This paper introduces a principle of how to measure individual circular pitch error and total cumulative pitch error, at the same time comparative method is put forward.
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