DocumentCode :
1780196
Title :
Experimental method for investigations on the influence of superimposed AC/DC field stress on the flashover performance of polluted outdoor insulators
Author :
Wagner, Aaron ; Knauel, J.
Author_Institution :
Inst. for High-Voltage Technol., RWTH Aachen Univ., Aachen, Germany
fYear :
2014
fDate :
19-22 Oct. 2014
Firstpage :
59
Lastpage :
62
Abstract :
In hybrid AC/DC overhead transmission lines outdoor insulators are exposed to superimposed AC and DC field stress. As the pollution flashover performance of insulators under pure AC and pure DC field stress differs, the impact of superimposition of field stress is not predictable and has to be investigated on experimental basis. A suitable test set up for such investigations based on simplified specimen geometry is developed. As the test bench uses hybrid AC/DC test voltage for hybrid field generation several protection measures concerning saturation of ferrite core based inductances, overvoltage and overcurrent are implemented. Experimental validation of suitability of the test set up regarding pollution tests is carried out and presented. Further, first pollution flashover tests under hybrid stress with homogenous pollution layer featuring constant Non-Soluble Deposit Density and varying Salt Deposit Density are performed, the results of which are presented as well. Applying hybrid AC/DC stress increases the peak flashover voltage compared to uniform DC stress. Depending on the AC/DC ratio of the electrical stress, the peak flashover voltage can also exceed the uniform AC peak flashover voltage.
Keywords :
flashover; hybrid power systems; insulator contamination; overcurrent protection; overvoltage; power overhead lines; AC field stress; ferrite core; flashover performance; flashover tests; hybrid AC-DC overhead transmission lines outdoor insulators; hybrid field generation; nonsoluble deposit density; overcurrent; overvoltage; polluted outdoor insulators; salt deposit density; superimposed AC-DC field stress; Flashover; Hybrid power systems; Insulators; Pollution; Power transformer insulation; Slurries; Stress; articifical pollution test; hybrid AC/DC overhead line; outdoor insulation; pollution flashover voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2014 IEEE Conference on
Conference_Location :
Des Moines, IA
Type :
conf
DOI :
10.1109/CEIDP.2014.6995875
Filename :
6995875
Link To Document :
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