The casting mold and production process for the production of current transformers

Abstract

The invention relates to a current transformer, a pouring mold for producing the current transformer and a production technology. The current transformer comprises a base, a primary coil, a secondary coil and an epoxy resin pouring body arranged on the base, the secondary coil comprises a plurality of ring-shaped secondary windings, the multiple secondary windings are longitudinally arranged in a stacked mode, the primary coil penetrates through the centers of the secondary windings of the secondary coil and is connected to a connection copper bar P1 and a connection copper bar P2 through two primary leads, the multiple secondary windings of the secondary coil are sleeved with a coil support, and the primary coil, the secondary coil and the coil support are integrally poured through epoxy resin to form the epoxy resin pouring body; the epoxy resin pouring body is wrapped by a silica gel insulation sleeve. The current transformer has the advantages that the floor space is small, and the structural design is reasonable. The pouring mold can be used for pouring current transformers in various voltage stages and with different numbers of windings and different volumes in a compatible mode. The production technology has the advantage of being low in production cost.

Description

technical field [0001] The invention specifically relates to a casting mold for producing a current transformer and a production process. Background technique [0002] At present, current transformers are generally used in power grid lines and switch cabinets as current measurement and protection equipment. In the production and development process of the existing current transformers, the trend of miniaturization of the switchgear is not considered, and the designed current transformer occupies a large space, which currently cannot meet the use of the switchgear in the power distribution room. Due to the unreasonable design of the internal coil layout of the existing current transformer, the occupied area of ​​the current transformer is relatively large. The structure of the current transformer is designed as follows: the secondary windings of the internal secondary coils are arranged horizontally side by side. When there are more than two secondary windings of the current...

AI Technical Summary

Problems solved by technology

In the production and development process of the existing current transformers, the trend of miniaturization of the switchgear is not considered, and the designed current transformer occupies a large area, which currently cannot meet the use of the switchgear in the power distribution room.

Due to the unreasonable design of the internal coil layout of the existing current transformer, the current transformer occupies a large area

The structure of the current transformer is designed as follows: the secondary windings of the internal secondary coils are arranged horizontally side by side. When there are more than two secondary windings of the current transformer, the footprint of the body of the current transformer It is greatly enlarged, so it is difficult to meet the requirements of the existing miniaturized switchgear used in the power distribution room, and the production cost of the current transformer is also relatively high

[0003] In the production process of the existing current transformer, due to the different voltage level, capacity and number of windings of the current transformer, its external shape and height are also different, so in the process of casting the current transformer, the manufacturer It is necessary to carve a pair of casting molds for each specification of current transformers, so it will cost a lot of money just to manufacture the casting molds in the manufacturing process, so the compatibility of the casting molds is poor, resulting in current mutual inductance Devices are expensive to manufacture

Images