电压互感器熔断器冲击暂态特性及其选择方法

Impact Transient Characteristics and Selection Method of Voltage Transformer Fuse

在中性点不接地系统中,用于保护电压互感器(VT)的高压熔断器经常发生不正常熔断,造成VT运行不平衡。本文报道了VT熔断器的稳态电流试验、分断特性、X射线测量、电晕试验和电磁暂态冲击试验结果。本文对电压互感器用高压熔断器的质量和电气性能进行了全面的检验和分析,为高压熔断器在电压互感器中的应用提供了新的指导。本文建议35 kV和10 kV系统在单熔断器的基础上采用额定电流为1A的熔断器,该熔断器不易氧化,骨架由Ag或Ni熔体组成。

Ina neutral ungrounded system,the high voltage fuses used to protect voltage transformers(VTs)often abnormally blow out,causing unbalanced VT operation.Fuses also fail to blowout in time,resulting in further damage to the VT.This paper reported the results of steady-state current testing,breaking characteristics,X-ray measurements,fuse corona testing,and electromagnetic transientimpact testing for VT fuses.This paper comprehensively examines and analyzes the quality andelectrical performance of VT fuses and provides new guidance for the use of high voltage fuses involtage transformers.This paper recommends that 35 and 10 kV systems use fuses rated fora currentof 1 A based ona single fuse,which is not easily oxidized and ha sa wound skeleton composed of an Ag or Ni melt.