Analysis of Material and Temperature Rise Test of 10kV Drop-out Fuse

In order to effectively control the quality of the 10kV drop fuse, the main reason for the operation of the fuse in the system is given, and the quality improvement method is proposed. The State Grid Corporation conducts the sampling test of the 10kV drop fuse. Through the material analysis and temperature rise test of the fuse, the material temperature of the contact surface of the main circuit conductor of the 10kV drop fuse is tested, and the test standard temperature rise limit is given. Combined with the temperature rise test results, the operating conditions and quality problems of the fuse equipment were analyzed. The test analyzes the root cause of the different operating currents of the fuses and the overheating at different locations. The temperature rise curve and the rising rate of the fuses at different positions are given. The results show that the fuse materials generally have different degrees of defects, the material testing failure rate is 88.9%, and the temperature rise test failure rate is 44.4%. The heat rise point of the fuse temperature rise test is mainly concentrated on the sliding position of the upper conductive piece and the upper contact, the screw connection position of the upper contact nut and the fusion tube, and the fastening position of the fuse and the lower conductor bolt. Therefore, strictly controlling the material quality of the 10kV drop fuse is of great significance for improving the stable operation of the 10kV drop fuse. The research results in this paper provide technical support for the material procurement of State Grid Corporation.