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所在平台: Udemy |
课程主页: https://www.udemy.com/course/power-transformer-protection/
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课程名称：电力变压器保护 概述：本课程介绍了电力系统保护中使用的不同类型的继电器，重点讲解了差动继电器在保护变压器和发电机免受局部故障方面的应用。差动继电器是一种当两个或多个相似电量之间的差异超过预设值时启动的继电器。在差动继电器电路方案中，有两个电流分别来自电力电路的两个部分，这两个电流在一个接点汇合，并与继电器线圈连接。根据基尔霍夫电流定律，流经继电器线圈的结果电流等于来自电路两部分电流的总和。在正常工作状态下，如果这两个电流的极性和幅值调整得当，它们的相量和为零，因此在正常情况下不会有电流通过继电器线圈。然而在电路异常时，如果这种平衡打破，即这两个电流的相量和不再为零，继电器线圈就会有非零电流流过，从而触发继电器动作。 课程内容包括： - 变压器保护 - 差动继电器的基本定义 - 西门子差动继电器7UT 613的测试 - 变压器差动保护的计算 - 准备测试程序和测试表 - 如何使用Omicron的高级模块进行自动差动测试 - 如何手动使用Omicron进行差动测试 - 测试其他差动继电器（如RET 670和MICOM P643） 本课程旨在为学员提供电力变压器保护和差动继电器使用的深入知识。
Hi,The relays used in power system protection are of different types. Among them, differential relay is a very commonly used relay for protecting transformers and generators from localized faults.The differential relay is one that operates when there is a difference between two or more similar electrical quantities exceeds a predetermined value. In the differential relay scheme circuit, there are two currents come from two parts of an electrical power circuit. These two currents meet at a junction point where a relay coil is connected. According to Kirchhoff Current Law, the resultant current flowing through the relay coil is nothing but the summation of two currents, coming from two different parts of the electrical power circuit. If the polarity and amplitude of both the currents are so adjusted that the phasor sum of these two currents, is zero at normal operating condition. Thereby there will be no current flowing through the relay coil at normal operating conditions. But due to any abnormality in the power circuit, if this balance is broken, that means the phasor sum of these two currents no longer remains zero and there will be non-zero current flowing through the relay coil thereby relay being operated.I have covered the following topics in this course- Transformer protection- Basic Definition of differential relay- Test Siemens differential relay 7UT 613- Calculation For Transformer Differential Protection- Prepare test procedure and test sheet.- how u can do differential test automatic by using advance module of omicron- how u can do differential test manually by using omicron- Test Other Differential Relay ( RET 670 & MICOM P643)
