Improved structure of tank cover of power distribution transformer

Abstract

The invention provides an improved structure of a tank cover of a power distribution transformer. The improved structure comprises a cover body, wherein the cover body is provided with a group of low-voltage terminal assembly holes; the improved structure is characterized in that the group of low-voltage terminal assembly holes are formed by direct opening in the cover body; the group of low-voltage terminal assembly holes include a first assembly hole, a second assembly hole, a third assembly hole and a fourth assembly hole; a through groove is arranged between the first assembly hole and the second assembly hole; another through groove is arranged between the second assembly hole and the third assembly hole; the other through groove is arranged between the third assembly hole and the fourth assembly hole; and magnetic isolating strips matched with the through grooves in size are welded in the corresponding through grooves. The improved structure is simple; the amount of a stainless steel material is reduced; the processing link is reduced; processing is convenient; the processing cost is reduced by 80%; and thermal deformation of the tank cover caused by welding is effectively avoided.

Description

technical field [0001] The invention relates to an improved structure of a box cover of a distribution transformer. Background technique [0002] In the distribution transformer, due to the large current passing through the tank cover at the low-voltage end, eddy currents are generated around, and the eddy current will cause heat around the lead wire of the fuel tank cover, affect the life of the tank cover, and increase the overall temperature rise of the distribution transformer. Increase the miscellaneous loss of the distribution transformer, thereby increasing the loss of the distribution transformer. Such as figure 1 As shown, the prior art solution to reduce eddy current loss is to open an elongated hole at the low-voltage lead wire of the box cover, and then add and weld a stainless steel plate with a low-voltage terminal assembly hole on the upper side of the elongated hole (this paper refers to Stainless steel is called austenitic stainless steel), to achieve magn...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. High processing cost

The thickness of the stainless steel magnetic isolation plate is generally more than 6mm, and 4 round holes must be opened, which can only be cut by wire cutting or machining, resulting in a significant increase in processing costs. Taking a common 630KVA distribution transformer as an example, a magnetic isolation plate The processing cost and material cost are about 600 yuan

2. The welding surface between the box cover and the magnetic isolation plate is large, and the box cover is more seriously deformed due to heat, which affects the strength and appearance of the box cover

Images