Electri c Machines and Control Vol. 22 No. 11 Nov DOI /j. emc

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1 Electri c Machines and Control Vol. 22 No. 11 Nov DOI /j. emc TM 216 A X Effects of carbonization of insulator core rod on properties of electric field distribution CAO Wen 1 2 LUAN Ming-jie 1 SHEN Wei 3 HUANG Xin-bo 1 MA Huan-cheng 1 TIAN Yi 1 1. School of Electronic InformationXi'an Polytechnic UniversityXi'an China 2. School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an China 3. Electric Power Research Institute of State Grid Shanxi Electric Power CompanyXi'an China AbstractThe degraded composite insulator easily causes flashovertripping and brittle fracture of the transmission linewhich seriously threaten the safety of power system. The insulators with the carbonization channel between the sheath and the mandrel were studied. The electric field around the carbonized mandrel bar was calculated and analyzed by finite element method. The simulation model of the insulator was established. The electric field distribution along the carbonization channel between sheath and mandrel was measured in laboratory. The experimental data were in good agreement with the simulation resultsand the correctness of theoretical calculation was verified. The results show that the carbide channel make the space electric field value distortion the closer is channel from high voltage side the more obvious is distortionthe electric field value inside the insulator shed of the carbonization channel is increased KCT

2 90 22 Keywordscomposite insulatordegradationcarbonized mandrelelectric field distributionsimulating calculation 0 COMSOL FXB2-110 / kv Table 1 Structural parameters of composite insulator ANSYS 500 kv /kv 110 /kn /mm /mm /mm /kv min /kv 230 thermally stimulated current TSC F X B W kv kn 2 COMSOL 1 O 3 N 2 2

11 91 1 10 10 110 kv 89. 8 kv 0 180 kv /m 80% 5% 2 2 Table 2 2 1 Fig.

3 kv kv kv /m 80% 5% 2 2 Table Fig. 1 Simulation model Relative dielectric constant of each material Fig. 2 Cloud picture of electric field distribution 2 of carbide channel 1 mm mm Fig. 3 Results of simulation of different position 3 of carbide channel

92 22 4 20 kv /m 2 5 1 mm 40 2. 1 100 mm 0 ~ 400 V GDC100 1 000 1 DS1102 Fig.

5 Simulation results of different carbide channel length 7 Poker' s 2 10 mm 2 5 2 2

4 kv /m mm mm 0 ~ 400 V GDC DS1102 Fig. 4 Poker' s 6 4 Sketch map of different carbide channel length Fig. 6 5 Fig. 5 Simulation results of different carbide channel length 7 Poker' s 2 10 mm pf 5 kv /m 7 5 Fig. 7 Picture of probe 2 10 kv /m 2 6 Schematic diagram of test principle for probe

11 93 7 A B C D E F G 8 8 Fig. 8 Diagram of the electric field test of composite 10 insulator Fig.

3 Φ1 mm 2 9 3 30 kv 2 11 12 Fig. 9 9 Insulator samples containing carbide channel 2 11 1 Fig.

5 A B C D E F G 8 8 Fig. 8 Diagram of the electric field test of composite 10 insulator Fig. 10 Testing location for insulator samples with carbonized channel Φ1 mm kv Fig. 9 9 Insulator samples containing carbide channel Fig. 11 Results of electric field measurement for 1 st group of carbonized channel in high 1b 2 voltage side 1 2 ~ S1 12 S3 9 ~ S2 12 S4

6 Fig. 12 Results of electric field measurement for 2 nd group of carbonized channel in middle of string J LIANG XidongWANG ChengshengFAN Ju. Research on brittle fracture of FRP rods and the test method J. Power System Technology J J. Electric Machines and Control 3 Analysis and counter- FXB2-110 / HAN JihuiSHEN QingheYONG Jun. measure of brittle fracture of composite insulator J J. WANG GuochunCHEN Yuan. Composite insulator service in Beijing-Tianjin-Tangshan power network J. Insulators and Surge Arresters J XU QiyingLI Rilong. Analysis and discussion of composite insulator J. Insulating Materials J HUANG XinboOUYANG LishaWANG Yanaet al. Analysis on key influence factor of transmission line icing J. High Voltage Engineering TAO WeiliangWANG XianpeiLIU Yanet al. Measurement on composite insulators' contact angles based on image processing J WANG FochiYAN KangZHANG Zhongyuan et al. Identifying insulator hydrophobicity by image analysis and neural network J. Electric Machines and Control quipment J. J. Electrical E-. D.. D. 10. / J WANG FeifengZHANG PeihongGAO Mingze. Research on the dielectric characteristics of nano-sic / silicone rubber composites. Journal of Harbin University of Science and Technology 500 kv J XIE CongzhenLIU ShanLIU Qinet al. Internal defects influence of 500 kv AC composite insulator on the electric field distribution along the axisj. High Voltage Engineering

7 on TSC test J. Proceedings of the CSEE J JIANG XingliangXIA QiangfengHU Qinet al. Influence of deteriorated insulator on the electric field distribution of overhang string J. Proceedings of the CSEE J LI ChengrongCHEN YuCHENG Yangchun. On-line detection 13. of internal defects of composite insulator by electric field mapping J CHEN YuanLIU YanshengSHEN Jianet al. Inner-defect detection method for composite insulatorsj. Power System Technology TSC insulator J J ZHANG HuiTU YoupingTONG Yuliang. Study on aging characteristics of silicone rubber sheds of composite insulators based J. High Voltage Engineering J SU Mei. The role of steep wave test in the detection of composite. High Voltage Engineering

34 22 f t = f 0 w t + f r t f w θ t = F cos p - ω 0 t - φ 1 2 f r θ t = F cos p - ω 0 t - φ 2 3 p ω 0 F F φ 1 φ 2 t A B s Fig. 1

34 22 f t = f 0 w t + f r t f w θ t = F cos p - ω 0 t - φ 1 2 f r θ t = F cos p - ω 0 t - φ 2 3 p ω 0 F F φ 1 φ 2 t A B s Fig. 1 22 2 2018 2 Electri c Machines and Control Vol. 22 No. 2 Feb. 2018 1 2 3 3 1. 214082 2. 214082 3. 150001 DOI 10. 15938 /j. emc. 2018. 02. 005 TM 301. 4 A 1007-449X 2018 02-0033- 08 Research of permanent