自动化外文文献 2×300MW火力发电厂设计 电气工程及其自动化毕业论文外文文献.doc

自动化外文文献 2×300MW火力发电厂设计 电气工程及其自动化毕业论文外文文献 导读：就爱阅读网友为您分享以下“2×300MW火力发电厂设计 电气工程及其自动化毕业论文外文文献”的资讯，希望对您有所帮助，感谢您对92的支持! transformer. Computer based relays can offer solutions to all of these issues to significantly increase the accuracy of operation for a percentage differential protection scheme. The main error caused by mismatched ratios is quickly mediated by the fact that a computer can take the output from any CT and scale it according to the turns ratio necessary for the secondary currents to match up. In fact, the CTs do not even need to have secondary currents that are close to each other, but simply take the current low enough for an analog to digital conversion to be given to the computer. CTs can then be chosen based on their accuracy as well as their saturation limits in order to prevent some of the other issues discussed. The computer itself can be given inputs on different phenomena going on to prevent unnecessary operation. For example, if the transformer is being brought online the computer can be set to recognize and ignore the issues brought about by the inrush currents. In the case of a transformer with tap changing occurring, the relay could be set up to allow for any inrush currents expected as well as change the necessary ratios on the CTs. With certain communication parameters, it could even be possible for a computer based differential relay to recognize when faults outside of the transformer will affect operation of the relay. In the field of communication, there are many opportunities to improve protection schemes. 19 广东工业大学 华立学院 本科毕业设计（论文）