Fan-shaped off-circuit tap-changer

Abstract

The invention relates to a fan-shaped off-circuit tap-changer which comprises a transmission mechanism, three phases of moving contact sets, three phases of fixed contact sets and an overall structure. The overall structure is composed of a mounting flange plate, a sliding gear rack and a supporting frame, the mounting flange plate is fixedly arranged on the upper end face of the supporting frame, and the sliding gear rack is arranged in the lower end face of the supporting frame in a sleeved mode. The shaft end portion of the gear shaft of the transmission mechanism penetrates through a central hole of the mounting flange plate, and the mounting flange plate is fixedly arranged on the supporting frame. The position of the gear of the other end of the gear shaft is meshed with the wheel teeth of the sliding gear rack. All phases of moving contacts in the three phases of moving contact sets are limited in three pairs of grooves of the sliding gear rack. The three phases of fixed contact sets are fixed in the grooves of three sections of cuboid bosses in the supporting frame respectively. Scattered and related pieces in the switch are smelted together for injection molding, and the length of the switch can be effectively reduced. A gear and rack mechanism is adopted in the transmission mechanism of the switch, the transmission mechanism of the switch is designed in a stacking mode, the fixed contacts of the switch are linearly distributed, and the width of the switch can be greatly reduced.

Description

technical field [0001] The invention relates to a fan-shaped off-excitation tap changer, which is used in small and medium-sized oil-immersed transformers. Background technique [0002] There are two main development directions in my country's electric power industry: one is to develop in the direction of high voltage and ultra-high voltage, and the other is to develop in the direction of energy saving and miniaturization. The former is mainly used for long-distance power transmission and transformation lines, and the latter is mainly used for On urban and rural power transmission and transformation lines. Among them, in urban and rural power transmission and transformation lines, distribution transformers account for a large proportion. Improving their performance and reducing manufacturing costs are of great significance to the energy saving of the power system, improving the reliability of the system and the development of the national economy. The main component of the p...

AI Technical Summary

Problems solved by technology

[0004] Disc-shaped off-excitation tap-changer has a large chassis diameter due to its three-phase fixed contacts distributed symmetrically along the circumference of 360°. When used in a small-capacity distribution transformer, the transformer box must be widened, which increases the manufacturing cost of the transformer.

[0005] The bolt-connected bar switch in the bar-shaped off-excitation tap-changer adopts a combined structure, and the rack and pinion mechanism adopts a tiled method, that is, the rack and pinion are located in the same plane, so the overall length of the switch is long. Wider width, when used for small-capacity transformers, the transformer box must be lengthened to increase the manufacturing cost of the transformer; cold-pressed connection strip switch, because the transformer tap lead and the fixed contact of the switch are rigidly connected, so it is inconvenient to replace the switch. It is inconvenient to replace the lead wires if they are wrongly connected, that is, it is not easy to install and use

[0006] To sum up: the tap changer of the prior art is used in a small-capacity distribution transformer, and there are two disadvantages: 1. The large volume of the switch increases the manufacturing cost of the transformer; convenient

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