描述
6sc9811-4CK02
变压器继电保护的原则
继电保护装置发挥保护功能要具有可靠性、选择性、灵敏性和速动性四个特点。可靠性是继电保护的最基本要求，要求在执行继电保护的过程中，正确判断和发现故障，并且要发出正确的预警信号。继电保护装置要满足设备运行的基本性能，不能误动或者拒动。当变压器出现短路后，还要求继电保护装置具有选择性，是指在发生故障后只对保护区范围内出口动作，帮助维修人员判断故障位置，减少资源浪费，不影响系统的整体工作性能。由于故障多在瞬间出现，因此判断故障也要具有灵敏性和快速性，从性能上继电保护装置应具有高度的灵敏性，一旦设备存在故障隐患，就将提供预警报告，并将故障可能范围降到最低，使工厂可以实现预防先于维修，提高设备的运行效率。继电保护装置整体规程与灵敏度的计算方式不同，前者是在最大运行方式下进行计算的，而后者是在最小运行方式下进行计算的。灵敏度高的继电保护装置要能够对短路点进行正确判断。也就是说，无论是在最大运行模式，还是在最小运行模式下，继电保护系统都要保持可靠的运作性能。要求继电保护装置可以识别变压器内部轻微匝间故障，确保保护范围。同时，继电保护装置的动作要快，要在第一时间做出判断，以便于维修人员能够及时发现变压器故障，减少运行损失。继电保护装置的故障判定范围包括电厂设备的母线电压小于有效值、大型发电机或者大容量发电机内部故障、对人体安全造成影响的干扰信号，若单指变压器的话，还包括电压器内部的线路短路、匝间短路和接地短路现象。另外，针对故障的电流不平衡和差动电流现象，均应做出准确的判断，从而确保变压器的运行稳定，促进电厂的正常运行。
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