Abstract
As GIS terminal is in cooperation with GIS switch, the GIS terminal with 470 mm structure is usually equipped with a 757 mm structure GIS switch. In order to study the influence of the extended conductive pole on the electrical performance of GIS cable terminal, the contact resistance of the extended conductive pole is measured. The measurement results show that the contact resistance meets the requirements of conductive flow. Through finite element simulation calculation of the influence of the extended conducting rod on the GIS terminal electric field distribution, it was found that the maximum field strength of the cable terminal of the extended conducting rod increased by 2 kv/mm, which was smaller than the breakdown field strength of sulfur hexafluoride gas, and the extended conducting rod did not affect the safe and stable operation of the GIS terminal. Extend the conductive rod by finite element simulation calculation interface without air gap and 0.1 mm gap, the distribution of electric field in both cases, contact resistance conforms to the requirements under the premise, extend the conductive rod interface is 0.1 mm gap the maximum field strength of 1.4 kv/mm, less than the sulfur hexafluoride gas breakdown voltage, contact air gap does not affect the safe and stable operation of the GIS terminal.
Highlights
IEC 62271 high voltage switch equipment and control equipment defined the GIS terminal connected to the switch at the bottom of the flange dimension and high dimension [1], and 110 kv GIS terminal with GIS switch height is divided into 470 mm and 757 mm, which is 470 and 757, but in the cable accessories industry manufacturing plant home, for the most part is to design the product according to the type 470, when cooperate with height is 757 mm[2], usually on the basis of the model 470 a 287 mm conductive extension rod, can meet the requirements
Operational practice, the type 757 and type 470 GIS terminal used more widely, in the feasibility study[4,5], preliminary design review, often questioned 757 type GIS add conductive terminal extension rod for GIS is influential cable storehouse safe and stable operation, due to the increase of conductive belongs to cable accessories manufacturers provide extension rod, GIS manufacturer cannot ensure conductive extension rod meets the demand of GIS cable storehouse safe and stable operation, cable accessories manufacturers provide a type test report is not clear affirmation opinion[6]
With extended type 757 GIS terminal of the conductive rod, with 470 type GIS terminal difference is whether there is the extension of 287 mm conductive rod, due to the extension of the conductive rod connected with 470 type GIS terminal by bolts is fixed, the contact resistance performance is measured the key indexes of the conductive pole overall conductivity, and appearance inspection, contact the air gap, conductive pole the insulation of the electric field intensity affect the GIS terminal performance as a whole
Summary
IEC 62271 high voltage switch equipment and control equipment defined the GIS terminal connected to the switch at the bottom of the flange dimension and high dimension [1], and 110 kv GIS terminal with GIS switch height is divided into 470 mm and 757 mm, which is 470 and 757, but in the cable accessories industry manufacturing plant home, for the most part is to design the product according to the type 470, when cooperate with height is 757 mm[2], usually on the basis of the model 470 a 287 mm conductive extension rod, can meet the requirements. The type test reports of some cable accessory manufacturers were inquired[3].
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