Lightning prevention on-load capacity regulation transformer and on-load capacity regulation switch

Abstract

The invention discloses a lightning prevention on-load capacity regulation transformer and an on-load capacity regulation switch. The on-load capacity regulation transformer comprises a low-voltage winding, a high-voltage winding and the on-load capacity regulation switch, wherein the transformer winding employs a Dyn11 connection mode when the capacity regulation transformer is switched to be in a large-capacity state by the on-load capacity regulation switch, and the transformer winding employs a Yzn11 connection mode when the capacity regulation transformer is switched to be in a small-capacity state. Yzn11 connection is achieved when the capacity regulation transformer is switched to small capacity, the on-load capacity regulation transformer has relatively high unbalance load bearing capability, has relatively high single-phase power supply ability and is particularly applicable to a place (such as village and mountain) where a three-phase load is difficult to balance; and moreover, the on-load capacity regulation transformer has favorable lighting prevention characteristic, and is particularly and suitably used as a lightning prevention transformer in a place where thunder frequently happens or soil with high resistivity.

Description

technical field [0001] The invention belongs to the technical field of transformer equipment in the electric power industry, and in particular relates to a lightning protection type on-load capacity-regulating transformer and an on-load capacity-regulating switch. Background technique [0002] The on-load capacity regulating transformer is a transformer with two rated capacities. According to the size of the load, use the corresponding capacity regulating switch to switch the connection mode of the transformer winding without cutting off the power supply, and then realize the transformer between two different capacities. switch between. [0003] At present, the lightning protection measures of on-load capacity regulating transformers on the market are mainly realized through external lightning protection devices. This kind of lightning protection device by destroying its own structure has high cost and poor lightning protection effect; in addition, the current The structure...

AI Technical Summary

Problems solved by technology

[0005] During the working process of the capacity regulating switch, every time the permanent magnet mechanism moves, the low-voltage transitional vacuum interrupter needs to complete the opening-closing-opening action, and before it performs the action from closing to opening, it needs Wait for the first low-voltage parallel vacuum interrupter and the second low-voltage parallel vacuum interrupter to be effectively extinguished before proceeding; and because the time for the permanent magnet mechanism to act once is very short, it is easy to occur when the arc is not effectively extinguished. The transitional vacuum interrupter has already started to open, which will cause the transformer to burn out

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