微机型变压器保护研究

对微机型变压器保护的现状进行了论述．分析了其动作正确率偏低的原因。结合中低压变压器保护的一些具体情况，提出了适用于110kV以下电压等级的新型变压器保护设计方案．并较详细地介绍了保护的原理、硬件和算法等。采用国内外比较成熟的保护原理以及改进的半波算法，两绕组和三绕组变压器的比率差动分别采用电流向量差制动和最大差值制动方式．提高了保护的灵敏度和快速性。详细介绍了由80C188微处理器和数字信号处理器（DSP）芯片构成的高性能硬件平台，其较高的采样频率和强大的计算功能使保护的动作时间大大降低．可以提高变压器保护的可靠性和速动性．

Study on microprocessor-based transformer relay protection

The current status of microprocessor-based transformer protection is described and the cause of its low correctness ratio is analyzed. A new transformer protection scheme is given to distribution networks below 110 kV. The protection principle,hardware design,software design and algorithm are described in detail. It applies popular protection principles and improved half-cycle Fourier algorithm. To improve sensitivity and speed,the restraint characteristics adopt current phasor difference and maximum current phasor difference for two-winding and three-winding transformers respectively. The protection hardware based on 80C188 microprocessor and digital signal processor is expounded. Its high sampling frequency and strong calculation ability enhance its sensitivity and speed.