In view of such issues of metal grounding material

which is widely used in power systems

as serious corrosion and high maintenance costs in operation

the new corrosion-resistant flexible graphite grounding material has become a popular research direction. Since the electrical and thermal characteristics of the flexible graphite grounding material are quite different from those of traditional metal grounding material

its thermal stability performance under power-frequency current is also different from that of metal material

which becomes the main factors restricting the selection of cross-section and structural design of flexible graphite grounding material. In order to obtain more accurate thermal stability performance of flexible graphite grounding material

the experimental research on the electrical and thermal characteristics of flexible graphite grounding material under different short-term power-frequency currents is performed

and the corresponding thermal stability temperature thresholds and thermal stability ratio are obtained. The research results show that the maximum allowable working temperature (thermal stability temperature threshold) of the flexible graphite grounding materials is about 300 ℃

which is closer to the traditional metal grounding material; and its thermal stability ratio is about 2.94

which is lower than that of metal grounding material. Therefore

in case of designing the grounding body

only the section of the grounding body of the flexible graphite material exceeds that of the metal grounding material

can the current capacity meet the actual needs be assured.