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Abstract

C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> is one of the most promising alternatives to SF<inf>6</inf> in high-voltage electrical equipment such as gas insulated switchgear (GIS) because of its excellent electrical performance and low environmental impact. However, the insulation characteristics of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> is still unclear regarding the effect of conductor surface roughness. To obtain a figure of merit of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> gas mixtures and to evaluate its sensitivity to local inhomogeneous electric field, the breakdown voltage of electronegative gas considering surface roughness is developed using the streamer discharge theory. A gas discharge experimental platform for C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixed gas is set up and the discharge test is carried out under gas pressures from 0.15∼0.5 MPa having a maximum protrusion height of 15 μm. The results demonstrate that when the volume fraction of C<inf>4</inf>F<inf>7</inf>N is 10%, the figure of merit of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixture is slightly higher than that of SF<inf>6</inf> gas. Therefore, at the same pressure, the standard of conductor surface roughness for C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> equipment can refer to the original SF<inf>6</inf> gas equipment.

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Influence of conductor surface roughness on insulation performance of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixed gas

C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> is one of the most promising alternatives to SF<inf>6</inf> in high-voltage electrical equipment such as gas insulated switchgear (GIS) because of its excellent electrical performance and low environmental impact. However, the insulation characteristics of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> is still unclear regarding the effect of conductor surface roughness. To obtain a figure of merit of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> gas mixtures and to evaluate its sensitivity to local inhomogeneous electric field, the breakdown voltage of electronegative gas considering surface roughness is developed using the streamer discharge theory. A gas discharge experimental platform for C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixed gas is set up and the discharge test is carried out under gas pressures from 0.15∼0.5 MPa having a maximum protrusion height of 15 μm. The results demonstrate that when the volume fraction of C<inf>4</inf>F<inf>7</inf>N is 10%, the figure of merit of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixture is slightly higher than that of SF<inf>6</inf> gas. Therefore, at the same pressure, the standard of conductor surface roughness for C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> equipment can refer to the original SF<inf>6</inf> gas equipment.

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Keywords

cltinfgt4ltinfgtfltinfgt7ltinfgtncoltinfgt2ltinfgt equipment cltinfgt4ltinfgtfltinfgt7ltinfgtn cltinfgt4ltinfgtfltinfgt7ltinfgtncoltinfgt2ltinfgt mixed gas streamer discharge theory protrusion height breakdown voltage local inhomogeneous electric field insulation environmental impact electronegative gas considering surface roughness gas discharge experimental platform fraction figure of merit gas insulated switchgear gis

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Yu ZhengWenjun ZhouHan LiXianglian YanZhibing LiWeijiang ChenKai Bian,.Influence of conductor surface roughness on insulation performance of C<inf>4</inf>F<inf>7</inf>N/CO<inf>2</inf> mixed gas. 26 (3),922-929.

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