灭磁电阻是励磁系统中的关键设备，可以在发电机组或电力系统故障时快速消耗转子磁场能量，保障发电机组安全。针对国内大型机组励磁系统碳化硅灭磁电阻完全依赖进口的现状，白鹤滩电厂积极开展国产化研究，研制出的百万机组国产碳化硅灭磁电阻在外形尺寸与进口产品的外径、内径、厚度一致的情况下单片能容量达100千焦，远超进口碳化硅电阻单片能容量75千焦的水平，并已通过国内外两家权威机构测试。同时，配套研制的国产灭磁电阻在线监测装置，能够从电压、电流、能容、温度、均流系数、非线性系数等多维度对灭磁电阻进行监测，有效提高对灭磁电阻的故障预测能力，实现行业首创。

国产碳化硅灭磁电阻研制、测试及真机试验的成功，将改变目前大型发电机励磁系统碳化硅灭磁电阻完全依赖进口的现状，进一步提高关键设备自主可控能力，对长江电力所辖各大电站的降本提质和安全运行也具有重要意义。

Field resistance is a key equipment in excitation system, which can quickly consume rotor field energy when the generator set or power system fails, and ensure the safety of the generator set. In view of the current situation that the silicon carbide magnetic resistance of the excitation system of domestic large units is completely dependent on imports, Baihetan Power Plant actively carries out localization research, and develops the domestic silicon carbide magnetic resistance of one million units in the shape size and the outer diameter, inner diameter and thickness of imported products, the single chip capacity of 100 kJ, far exceeding the single chip capacity of imported silicon carbide resistance of 75 kJ. And has passed the test of two authoritative institutions at home and abroad. At the same time, the domestic online monitoring device can monitor the MDR from multiple dimensions such as voltage, current, energy capacity, temperature, current sharing coefficient, nonlinear coefficient, etc., effectively improve the fault prediction ability of MDR, and realize the industry's first.

The success of the development, testing and real machine test of the domestic silicon carbide magnetic resistance will change the current situation that the silicon carbide magnetic resistance of the excitation system of large generators is completely dependent on imports, and further improve the autonomous controllable ability of key equipment, which is also of great significance to the cost reduction, quality improvement and safe operation of the major power stations under the authority of Yangtze River Power.