Influence of pollution chemical components on AC flashover performance of various types of insulators

The pollution on insulators is composed of various chemical components, which threaten the stability of external insulation. However, the existing insulation designs have not taken this issue into consideration. This work aimed to study the influence of pollution chemical components on flashover performance of insulators with various materials. Flashover tests of porcelain, glass and silicone rubber insulators polluted by eight types of common contaminants were conducted. Based on the test data, the influence of chemical components and their solubility on equivalent salt deposit density (ESDD) and insulator flashover performance were analysed; and the electrical properties of different types of insulators were compared. Results show that the ESDD contribution rate changes with chemical components. The dissolution characteristic has a significant influence on the measurement of ESDD; slightly soluble contaminants need to be considered separately. The corresponding insulator flashover gradient for ions can be summarised as Cl −  < NO 3 −  < SO 4 2− , K +  < Na + , NH 4 +  < Ca 2+ . For a glass insulator, the flashover gradient is 4.9–17.0% higher than that of a porcelain insulator. For a silicone rubber insulator, this gap reaches 14.6–24.4 and 83.3–90% for freely soluble pollution and CaSO 4 , respectively, this phenomenon can be explained by the combined action of the slightly soluble character of CaSO 4 and hydrophobicity transference of silicone rubber.

[1]  Xingliang Jiang,et al.  AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution , 2018, High Voltage.

[2]  Ruijin Liao,et al.  Research on the long-time operation performance of composite insulator shed hydrophobicity under hydrothermal conditions , 2018 .

[3]  Xingliang Jiang,et al.  Study on the flashover performance of various types of insulators polluted by nitrates , 2017, IEEE Transactions on Dielectrics and Electrical Insulation.

[4]  Xingliang Jiang,et al.  Study on the influence rules of soluble contaminants on flashover voltage of disc suspension insulators , 2016, IEEE Transactions on Dielectrics and Electrical Insulation.

[5]  Yue Yishi,et al.  Study on natural pollution accumulating characteristics of cap and pin suspension ceramic insulator with composite shed of DC 500kV transmission line in central China , 2016, 2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE).

[6]  Zhang Zhijin,et al.  Measurement and Ion-pairing Analysis of Natural Contamination Constituents on Insulators with Different Material , 2016 .

[7]  Xingliang Jiang,et al.  Effects of soluble constituents on insulator flashover performance and flashover voltage prediction , 2015, 2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP).

[8]  Xingliang Jiang,et al.  Electrical property of different types insulator string under typical pollution constituents , 2015, 2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP).

[9]  A. Beroual,et al.  Influence of pollution constituents on DC flashover of high voltage insulators , 2013, IEEE Transactions on Dielectrics and Electrical Insulation.

[10]  S. Pitroda,et al.  ARTIFICIAL POLLUTION TEST ON HIGH VOLTAGE INSULATORS TO BE USED ON AC SYSTEMS , 2013 .

[11]  Li Licheng.  A Review on Influence of Natural Contaminant CaSO_4 on Surface Insulation Characteristics of External Insulation of Power Equipment , 2011 .

[12]  Chen Rong.  Measurement and Analysis of Natural Contamination Ion Composition Using Ion Chromatography Analysis , 2010 .

[13]  Qin Hu,et al.  Study on AC pollution flashover performance of composite insulators at high altitude sites of 2800-4500 m , 2009 .

[14]  Xingliang Jiang,et al.  Study on AC pollution flashover performance of composite insulators at high altitude sites of 2800-4500 m , 2009, IEEE Transactions on Dielectrics and Electrical Insulation.

[15]  Fuzeng Zhang,et al.  Investigation on DC flashover performance of porcelain insulators in high altitude areas , 2008, 2008 International Conference on Condition Monitoring and Diagnosis.

[16]  Sun Cai-xin,et al.  Present Situation and Prospect of Research on Flashover Characteristics of Polluted Insulators , 2006 .

[17]  Liu Yu,et al.  Quantitative Analysis and Verification on the Contribution of CaSO_4 to Equivalent Salt Deposit Density , 2005 .

[18]  Liu Yan-sheng,et al.  COMPARISON OF NATURAL CONTAMINANTS ACCUMULATED ON SURFACES OF SUSPENSION AND POST INSULATORS WITH DC AND AC STRESS IN NORTHERN CHINA'S INLAND AREAS , 2004 .

[19]  Caixin Sun,et al.  Flashover performance and voltage correction of iced and polluted HV insulator string at high altitude of 4000 m and above , 2003, Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417).

[20]  Md. Abdus Salam,et al.  Study the relationship between the resistance and ESDD of a contaminated insulator a laboratory approach , 2003, Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417).

[21]  T. Imakoma,et al.  Contamination performance of outer-rib type suspension insulators , 2002, IEEE/PES Transmission and Distribution Conference and Exhibition.

[22]  Masaru Ishii,et al.  Influence of nonsoluble contaminants on the flashover voltages of artificially contaminated insulators , 1996 .

[23]  K. Naito.  A study on the characteristics of various conductive contaminants accumulated on high voltage insulators , 1993 .

[24]  C. Wu,et al.  On the Deleterious Effects of Nitrates on Insulating Surfaces under HVDC Conditions , 1979, IEEE Transactions on Electrical Insulation.