Casting method of low-voltage straight-through current transformer secondary coil

Abstract

The invention discloses a casting method of a low-voltage straight-through current transformer secondary coil, which casts the secondary coil twice and comprises the following steps of: putting the seThe invention discloses a casting method of a low-voltage straight-through current transformer secondary coil, which casts the secondary coil twice and comprises the following steps of: putting the seuct is not exposed, and the transformer has big capacity.duct is not exposed, and the transformer has big capacity.condary coil and an insert into a mould cavity of a primary casting mould and carrying out primary casting; removing the primary casting mould and obtaining the secondary coil and the insert which arecondary coil and an insert into a mould cavity of a primary casting mould and carrying out primary casting; removing the primary casting mould and obtaining the secondary coil and the insert which arecast together, namely a semi-finished product; then putting the semi-finished product into a secondary casting mould, fixing the secondary coil in the mould cavity of the secondary casting mould by u cast together, namely a semi-finished product; then putting the semi-finished product into a secondary casting mould, fixing the secondary coil in the mould cavity of the secondary casting mould by utilizing the insert, thus ensuring a safety wall thickness between the surface of the secondary coil and the inner wall of the mould cavity of the secondary casting mould to carry out secondary castintilizing the insert, thus ensuring a safety wall thickness between the surface of the secondary coil and the inner wall of the mould cavity of the secondary casting mould to carry out secondary casting; and removing the secondary casting mould, and obtaining a finished product of the straight-through current transformer. The casting method facilitates the casting production, the package of the prog; and removing the secondary casting mould, and obtaining a finished product of the straight-through current transformer. The casting method facilitates the casting production, the package of the prod

Description

Casting Method for Secondary Coil of Low-Voltage Feedthrough Current Transformer technical field The invention relates to the technical field of current transformers, and relates to a casting method for a secondary coil of a low-voltage through-core current transformer. Background technique In the processing and molding of current transformers with low-voltage through-cores (generally annular cores) in the prior art, there are two casting methods for hoisting the secondary coil 20 (as shown in FIG. 1 ) in the mold: one is to bind the secondary coil 20 On the support 10, then, the support 10 that is bound with the secondary coil 20 is fixed in the die cavity of the mould (as shown in Figure 2), pours, and makes the through-core current transformer; Directly tie several cloth tapes on the secondary coil 20, hang the secondary coil 20 in the cavity of the mold by means of the cloth tapes, and perform casting to make a through-core current transformer. Regardless of the abov...

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Problems solved by technology

Regardless of the above-mentioned casting methods, there are defects that the secondary coil 20 is difficult to hoist and unstable. The secondary coil 20 is prone to offset in the mold cavity, resulting in uneven wall thickness after casting, and even after demoulding. Therefore, in order to avoid the uneven wall thickness and the occurrence of exposed pockets, the design size of each part of the secondary coil 20 is usually reduced so that there is a large enough gap between the secondary coil 20 and the inner wall of the mold cavity. distance, to ensure that the secondary coil 20 is completely covered, so that the surface of the secondary coil 20 has a safe wall thickness, but such a small secondary coil 20 results in a small transformer capacity

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