论文部分内容阅读
讨论了几种二次谐波变压器差动保护的原理,分析了各自的可靠性和灵敏性,结果表明:虽然采用二次谐波制动原理,但是采用不同的制动涌流方式,其制动效果存在较大差别,在特高压大型变压器保护中的应用还有待进一步改进和完善。在总结二次谐波制动的特点后,提出了改进的制动方式,同时针对励磁和故障时直流衰减的不同,提出了自适应二次谐波的制动方式。应用该方法差动保护明显优于采用传统二次谐波制动判据的保护,具有较好的工程应用价值。
The principle of differential protection of several second harmonic transformers is discussed. Their reliability and sensitivity are analyzed. The results show that although the second harmonic braking principle is adopted, different brake inrush modes are adopted, and the braking The effect there is a big difference in the application of UHV large transformer protection remains to be further improved and improved. After summarizing the characteristics of the second harmonic brake, an improved braking method is put forward. At the same time, aiming at the difference of DC attenuation during excitation and fault, an adaptive second harmonic braking method is proposed. Application of the differential protection of this method is obviously better than the traditional second harmonic braking criterion protection, and has good engineering application value.