Dry-type transformer high-pressure casting body and casting tool for casting tapping terminal of same

Abstract

The invention discloses a casting tool for a high-voltage coil tapping terminal of a dry-type transformer. The casting tool comprises a tool body, wherein a notch which is used for the tapping terminal to insert is formed in the tool body, a positioning groove for positioning the tapping terminal is formed in the bottom of the notch of the tool body, and a through threaded hole is also formed between the positioning groove and the back side of the tool body; when the tapping terminal to be cast is inserted into the notch, the bottom of the tapping terminal is positioned by virtue of the positioning groove and is tightly connected with a tightening bolt penetrating through the back side of the tool body, and a gap between the notch and the tapping terminal is filled with epoxy resin packing. The invention further discloses a dry-type transformer adopting the tapping terminal cast by the casting tool. The tapping terminal casting tool does not adopt a traditional sealing gasket and is provided with the positioning groove for positioning the tapping terminal, so that the part, which is arranged in the positioning groove, of the cast tapping terminal is basically not cast with insulation epoxy resin, and the favorable contact between the tapping terminal and an external copper bar is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a high-voltage casting body of a dry-type transformer and a casting tool for casting its tap terminals. Background technique [0002] The high-voltage casting body of the dry-type transformer is wrapped around the outer circumference of the high-voltage wire, and is cast outside the high-voltage coil with epoxy resin in a vacuum state. Such as figure 1 As shown, it is a cross-sectional view of a high-voltage cast body of an existing dry-type transformer, including a high-voltage cast body 10, a high-voltage wire 11 wrapped in the high-voltage cast body 10, and a tapped side of the high-voltage cast body 10 with a convex platform 12. Tapping terminals 14 are arranged on the boss surface 12 . At the same time, there is a corner 13 between the boss surface 12 and the high-pressure casting body 10. However, the corner 13 is prone to cracking at low temperature. Some manufactur...

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a high-voltage cast body using the tap terminal casted by the above-mentioned casting tool. In addition to being more convenient to connect with the external copper bar and having better contact, the high-voltage cast body also solves the problem of The problem of cracking of the boss surface

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