Abstract
With the development of smart grids, the application of localized relay protection devices has greatly reduced the distance between the secondary equipment and the primary equipment. The secondary equipment will be in a more complex electromagnetic environment during the operation of the GIS disconnector. The present study takes the multi-path electromagnetic disturbance on the secondary cable caused by the disconnector switching operation of the domestic 1000 kV ultra-high voltage GIS test circuit as the research background, solves the field-line coupling problem based on the finite integral technique, and combines the multi-conductor transmission line theory to solve the radiation disturbance and obtains its influencing factors. The results demonstrate that the radiated disturbance accounted for 16% of the overall electromagnetic disturbance when both ends of the shielding layer are grounded. The use of grounding at both ends of the shielding layer, reducing the height of the secondary cable wiring, avoiding the parallel arrangement of the secondary cables and the GIS pipe mother, and installing a low-pass filter, have different levels of suppression effects on electromagnetic disturbances. The research results will guide the reasonable arrangement of secondary cables in GIS substations to some extent and have reference significance for the protection of secondary equipment.
Highlights
The switching operation in gas-insulated switchgear (GIS) can generate very fast transient overvoltage (VFTO), which may generate transient enclosure voltage (TEV) during its propagation
This section compares the disturbance voltage levels on the core wire when the shieldgrounded at one end, the single-ended grounding measured by the control cabinet, and ing layer of the secondary cable is not grounded, the switch station side is grounded at bothend, ends grounded. grounding
When both ends of the shielding layer are not grounded, the secondary cable be shielded, and the external excitation field will induce a serious overvoltage on the core wire of the cable
Summary
The switching operation in gas-insulated switchgear (GIS) can generate very fast transient overvoltage (VFTO), which may generate transient enclosure voltage (TEV) during its propagation. Most ofmodel, the calculation methods for radiated the classical field-line coupling including the Taylor model [4],the. InAny view of the above-mentioned problems, the present study focuses on theinto multiturbance source, disturbance path andbythe disturbed device, and path coupling problemthe of the secondary equipment operating the disconnector, andthe sup the electromagnetic disturbance can be carried out separately for the parts. The present study analyzed the level of overall disturbance voltage on secondary cables caused by the disconnector switching operation and the influencing factors and proposed the electromagnetic disturbance suppression measures for the secondary cable. The research results of the present study will guide the reasonable arrangement of secondary cables in smart substations and have guiding significance to the establishment of electromagnetic disturbance suppression measures for secondary equipment in smart substations
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