Rail vehicle-mounted traction transformer protection method and device

• Main Authors: YANG ZHAOHUI, XUE QIAN, XU WEIHONG, TANG WEI, YAN DONGXU, FANG KUNRONG, LIU LIJING, YU XIAOYING, LIU ZHEN, LIU HUAXUAN, FU YING
• Format: Patent
• Language: Chinese; English
• Published: 12.01.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; INDUCTANCES; MAGNETS; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR; TRANSFORMERS

The invention relates to the technical field of power transformers, in particular to a rail vehicle-mounted traction transformer protection method and device.Three or more temperature sensors are adopted, every two temperature sensors form a group, the difference values of the temperature sensors are compared, and two sensor signals with the minimum difference value are selected as effective sensor signals; according to the method, the maximum value is selected as the actually measured oil temperature, signal isolation is carried out on the temperature sensor generating the large difference value, protection control is not participated, and sensor measurement values with the measurement values suddenly changed due to abnormal reasons are screened out, so that transformer protection misoperation caused by abnormal states of a protection device and other reasons is effectively reduced, and meanwhile, the safety of the transformer is improved. According to the method, the functions of recognizing and isolating s