CN218447524U - Large-caliber zero-sequence current transformer with high parameters - Google Patents

Abstract

The utility model provides a secondary coil is constituteed to the outside winding copper line of high parameter, copper line and iron core, and the both ends of copper line link to each other with secondary binding post respectively, and the inside of bakelite board protective case is arranged in to the iron core, is equipped with the buffer layer in the outside of bakelite board protective case, through epoxy vacuum casting, forms the pouring body secondary coil, secondary binding post, buffer layer, bottom surface inserts, and secondary line binding post arranges the outside of pouring body in. The utility model discloses a mechanical strength is good, capacious, stable performance, insulating strength are high.

Description

High-parameter large-caliber zero-sequence current transformer

Technical Field

The utility model relates to an electrical equipment, especially zero sequence current transformer.

Background

With the development of power systems, system protection changes are diversified, and the continuous development of relay protection enables the load demand of the back end to be increased continuously. When the primary current of the system is overlarge, the existing small-caliber zero-sequence current transformer cannot meet the product requirements, and a large-caliber high-parameter zero-sequence current transformer product is urgently needed according to the market requirements.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a mechanical strength is good, the capacity is big, stable performance, the high parameter's of dielectric strength heavy-calibre zero sequence current transformer.

The utility model discloses mainly include iron core, copper line, secondary binding post, bakelite board protecting crust, buffer layer, epoxy and bottom surface inserts.

Wherein, the outside winding copper line of iron core, copper line and iron core constitution secondary coil. The two ends of the copper wire are respectively connected with the secondary wiring terminals. The iron core is arranged in the bakelite plate protective shell, and a buffer layer is arranged outside the bakelite plate protective shell. And forming a casting body by the secondary coil, the secondary wiring terminal, the buffer layer and the bottom surface insert through epoxy resin vacuum casting. The secondary wire connecting terminal is arranged outside the casting body.

Further, the iron core is made of cold rolled silicon steel sheets or ultra-microcrystalline alloy.

Furthermore, the bakelite board protective shell is made by using white wood laminated paper and cotton linter paper as reinforcements and using phenolic resin prepared by reacting high-purity fully-synthesized petrochemical raw materials as a resin adhesive. The material has the advantages of good mechanical strength, static resistance, medium-grade electrical insulation, large capacity, small iron loss, low magnetic density, good product data and stable performance.

Further, the buffer layer is silicon rubber.

The utility model discloses when using, can respectively adorn a current transformer on three-phase line, or let three-phase wire pass a zero sequence current transformer together, also can install a zero sequence current transformer on neutral conductor N, utilize it to detect the current vector sum of three-phase. The zero sequence current transformer has no signal output, and the executive component does not act. When the vector sum of each phase current is not zero when a ground fault occurs, the fault current enables the annular iron core of the zero sequence current transformer to generate magnetic flux, and the secondary side induced voltage of the zero sequence current transformer enables the execution element to act to drive the tripping device and switch the power supply network, so that the aim of ground fault protection is fulfilled.

Compared with the prior art, the utility model have following advantage:

1. good mechanical strength, large capacity, stable performance and high insulating strength.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

fig. 2 is a side view of the present invention;

in the figure, 1-epoxy resin, 2-silicon rubber buffer layer, 3-bakelite plate protective shell, 4-iron core, 5-copper wire, 6-secondary wiring terminal and 7-bottom surface insert.

Detailed Description

In the schematic diagrams of the present invention shown in fig. 1-2, the iron core is made of cold rolled silicon steel sheet or ultra-microcrystalline alloy. And a copper wire 5 is wound outside the iron core 4, and the copper wire and the iron core form a secondary coil. The two ends of the copper wire are respectively connected with the secondary wiring terminal 6. The iron core is arranged inside the bakelite board protective shell 3, the bakelite board protective shell is made by taking white wood laminated paper and cotton linter paper as reinforcements and taking phenolic resin prepared by reaction of high-purity fully-synthesized petrochemical raw materials as a resin adhesive. And a silicon rubber buffer layer 2 is arranged outside the bakelite plate protective shell. And forming a casting body by vacuum casting the secondary coil, the secondary wiring terminal, the silicon rubber buffer layer and the bottom surface insert 7 through epoxy resin 1. The secondary wire connecting terminal is arranged outside the casting body.

Claims (3)

1. The utility model provides a heavy-calibre zero sequence current transformer of high parameter mainly includes iron core, copper line, secondary binding post, bakelite board protecting sheathing, buffer layer, epoxy and bottom surface inserts, its characterized in that: the outside winding copper line of iron core, copper line and iron core constitution secondary coil, the both ends of copper line link to each other with secondary binding post respectively, and the inside of bakelite board protective case is arranged in to the iron core, is equipped with the buffer layer in the outside of bakelite board protective case, through epoxy vacuum casting, forms the pouring body to secondary coil, secondary binding post, buffer layer, bottom surface inserts, and secondary line binding post arranges the outside of pouring body in.

2. The high-parameter large-caliber zero-sequence current transformer of claim 1, wherein: the iron core is made of cold rolled silicon steel sheet or ultra-micro crystal alloy.

3. The high-parameter large-caliber zero-sequence current transformer according to claim 1, characterized in that: the buffer layer is made of silicon rubber.

Images