On-load capacity-regulating switch

Abstract

The invention discloses an on-load capacity-regulating switch which comprises a low-voltage winding, a high-voltage winding and an on-load capacity-regulating switch. When the on-load capacity-regulating switch switches a capacity-regulating transformer to a large-capacity state, the transformer winding uses a Dyn11 coupling mode. When the on-load capacity-regulating switch switches the capacity-regulating transformer to a small capacity, the transformer winding uses a Yzn11 coupling mode. The on-load capacity-regulating switch is a special capacity-regulating transformer. When switching to small capacity, the capacity-regulating transformer uses the Yzn11 coupling mode, has a good capability of bearing an unbalanced load, that is, has a good single-phase power supply capability, and is particularly suitable for areas (such as rural and mountainous areas) where a three-phase load is difficult to balance. The on-load capacity-regulating switch has a good lightning protection characteristic, and is especially suitable to be used as a lightning protection transformer in areas with lightning or areas with a high soil resistivity.

Description

technical field [0001] The invention belongs to the technical field of transformer equipment in the power industry, and in particular relates to 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 of some capacity regulating switches also limits the lightning protection effect...

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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