Abstract:

In order to investigate the high-voltage fuse frequent fusing of 10 kV secondary cabinet V-V connection potential transformer (PT) in internet data center,the steady-state power quality of the system is tested,and the voltage and current signals of the PT are recorded and analyzed for a long time.The excitation characteristics of the PT are tested on site to eliminate the causes of ferromagnetic resonance and product quality.The fuse was dissected.Combined with the time characteristic curve of the fuse,it is preliminarily inferred that the reason for PT fuse fusing is that the primary fuse is damaged and fused gradually due to frequent impact of disturbance current.Finally,the monitoring data of the PT with the fuse specifications of 1A and 2A are compared and analyzed,and the solution to replace the 1A fuse with 2 A at this stage is proposed.Then,the suggestions are put forward for further troubleshooting.

Key words: potential transformer (PT), high-voltage fuse, fusing, disturbance current