CN223885046U - Junction box structure of current transformer - Google Patents

Abstract

This utility model discloses a junction box structure for a current transformer, comprising: a junction box body; three first copper busbars fixed to the upper part of the junction box body, each first copper busbar including a lead-out end and a lead-in end; a second copper busbar fixed to the lower part of the junction box body and arranged alternately with the three first copper busbars; three current transformers fixed to the junction box body and vertically arranged between the first copper busbars and the second copper busbars; the starting end of each stator lead passes through the corresponding current transformer and is fixedly connected to the lead-out end of the corresponding first copper busbar; each neutral point lead passes through the corresponding current transformer and is fixedly connected to the second copper busbar; the cable is divided into three cable leads at the cable head position, and the three cable leads are respectively fixedly connected to the lead-in end of the corresponding first copper busbar. The junction box structure provided by this utility model can solve the problem of difficult wiring.

Description

Junction box structure of current transformer

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to a junction box structure of a current transformer.

Background

The current transformer is a product specially designed for a high-capacity motor differential protection device and is generally suitable for motors with the power of more than 2000 kW. The working principle is that leads at the initial end and the neutral point end of each phase of stator winding of the motor are respectively connected into a magnetic balance transformer, when the same short circuit or ground fault occurs in the motor, the fault current breaks the magnetic flux balance of the current transformer, the secondary side generates current, when the current reaches a specified value, a current relay is started to trip a short circuit device in a motor power distribution cabinet, and the motor current is cut off, so that the purpose of protecting the motor is achieved.

As shown in fig. 1 and 2, the installation structure of the current transformer in the prior art includes a current transformer 400 horizontally arranged in a junction box body 100, a first wiring copper bar 200, a second wiring copper bar 300 and a cable 700, wherein the first wiring copper bar 200 and the second wiring copper bar 300 are oppositely arranged up and down, the current transformer 400 is horizontally arranged between the first wiring copper bar 200 and the second wiring copper bar 300, a stator lead start 500 is connected to an outlet end of the first wiring copper bar 200 after being extended out through a motor housing 800, a cable lead 701 separated by the cable 700 is connected to an inlet end of the first wiring copper bar 200 after passing through the current transformer 400, a neutral point lead 600 extends into the junction box body 100 through the motor housing 800 and is connected to the second wiring copper bar 300 after passing through the current transformer 400.

However, because the interval between terminal box bottom and the current transformer is less, divide into three cable lead after the preparation cable head in the terminal box body, the interval between cable and the current transformer is less, leads to on-the-spot wiring difficulty, influences work efficiency.

Disclosure of utility model

The utility model aims to provide a junction box structure of a current transformer, which solves the problem of difficult wiring of a motor power supply.

Based on the problems, the technical scheme provided by the utility model is as follows:

a junction box structure of a current transformer, comprising:

the junction box body is hollow in the interior and is fixed on the outer wall of the motor shell;

three first wiring copper bars fixed at the upper part in the junction box body, wherein each first wiring copper bar comprises an outgoing end and an incoming end;

The second wiring copper bars are fixed at the lower part of the junction box body and are staggered with the three first wiring copper bars;

three current transformers fixed in the junction box body and vertically arranged between the first wiring copper bar and the second wiring copper bar;

The starting ends of the three stator lead wires are led out of the motor shell into the junction box body, and each starting end of the stator lead wire penetrates through the corresponding current transformer and is fixedly connected with the leading-out end of the corresponding first wiring copper bar;

Three neutral point leads led out from the motor casing to the junction box body, wherein each neutral point lead passes through the corresponding current transformer and is fixedly connected with the second connector lug copper bar;

The cable extends into the junction box body, three cable leads are separated from the cable at the position of the cable head, and the three cable leads are fixedly connected with the corresponding lead-in ends of the first wiring copper bars respectively.

In some embodiments, a supporting frame is arranged in the junction box body, and the three current transformers are fixed on the supporting frame.

In some embodiments, the support frame comprises two first brackets symmetrically fixed on the inner wall of the junction box body and oppositely arranged, and two second brackets symmetrically arranged and fixed between the two first brackets, and the current transformer is fixedly connected with the two second brackets.

In some embodiments, the first and second brackets are inverted L-shaped.

In some embodiments, the first bracket is welded on the inner wall of the junction box body, and the second bracket is connected with the first bracket and the current transformer is connected with the second bracket through bolts.

In some embodiments, the first wiring copper bar is fixed within the junction box via a first insulating subassembly.

In some embodiments, the second wiring copper bar is fixed within the junction box via a second insulator assembly.

In some embodiments, the first wiring copper bar is U-shaped.

In some embodiments, the second wiring copper bar is in a strip shape.

In some of these embodiments, the cable is secured to the junction box via a metal glan.

Compared with the prior art, the utility model has the advantages that:

1. The second wiring copper bars and the three first wiring copper bars are arranged in a vertically staggered mode, the current transformers are vertically arranged in the wiring box body, meanwhile, the initial ends of stator leads penetrate through the current transformers and then are connected with the leading-out ends of the first wiring copper bars, neutral point leads penetrate through the current transformers and then are connected with the second wiring copper bars, and cable leads separated by cables are directly connected with the leading-in ends of the first wiring copper bars, so that the current transformers cannot interfere with the installation of the cables, the installation of the cables is facilitated, and the installation efficiency is improved;

2. The current transformer is fixed in the junction box body through the support frame, and the structure of the support frame is simple, the installation is convenient, the stability is good, and the structural strength is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, in which the drawings are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art installation structure of a current transformer;

FIG. 2 is a second schematic diagram of a current transformer mounting structure in the prior art;

FIG. 3 is a schematic diagram of an embodiment of a junction box structure of a current transformer according to the present utility model;

FIG. 4 is a second schematic diagram of an embodiment of the present utility model;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

Wherein:

100. 200 parts of junction box body, 200 parts of first wiring copper bars, 300 parts of second wiring copper bars, 400 parts of current transformers, 500 parts of stator lead starting ends, 600 parts of neutral point lead wires, 700 parts of cables, 701 parts of cable lead wires, 800 parts of motor shell;

1. A junction box body;

2. a first wiring copper bar;

3. A second wiring copper bar;

4. A current transformer;

5. the initial end of the stator lead;

6. 6-1, cable leads, 6-2, cable heads;

7. 7-1 parts of a support frame, 7-2 parts of a first support frame and a second support frame;

8. a neutral point lead;

9. A first insulator assembly;

10. a second insulator assembly;

11. A motor housing;

12. A metal glan head.

Detailed Description

The above-described aspects are further described below in conjunction with specific embodiments. It should be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. The implementation conditions used in the examples may be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are generally those in routine experiments.

Referring to fig. 3 and 4, in order to provide a schematic structural diagram of an embodiment of the present utility model, a junction box structure of a current transformer is provided, which includes a junction box body 1, three first wiring copper bars 2, a second wiring copper bar 3, three current transformers 4, three stator lead start ends 5, three neutral point leads 8 and a cable 6.

The junction box body 1 is hollow in the inside and fixed to the outer wall of the motor housing 11, specifically, the bottom plate of the junction box body 1 is fixed to the motor housing 11 via a plurality of bolts.

Three first wiring copper bars 2, it fixes the upper portion in terminal box body 1, and every first wiring copper bar 2 includes leading-out terminal and leading-in terminal, and preferably, first wiring copper bar 2 is the U type to fix in terminal box body 1 through first insulator subassembly 9, first insulator subassembly 9 includes two first insulators of arranging side by side, and first insulator is fixed on the first support on terminal box body 1 through the screw, and first wiring copper bar 2 is through screw and first insulator fixed connection.

The second wiring copper bar 3 is fixed at the lower part in the junction box body 1 and is staggered with the first wiring copper bars 2, namely, the inclined lower parts of the first wiring copper bars 2 arranged by the second wiring copper bars 3 are preferably long-strip-shaped, and are fixed in the junction box body 1 through the second insulator assembly 10, the second insulator assembly 10 comprises a plurality of second insulators which are arranged at intervals, the second insulators are respectively fixed on a second bracket on the junction box body 1 through screws, and the second wiring copper bars 3 are fixedly connected with the second insulators through screws.

Three current transformers 4, which are fixed in the junction box body 2 and are vertically arranged between the first junction copper bar 2 and the second junction copper bar 3. In order to facilitate the installation of the current transformers 4, a supporting frame 7 is arranged in the junction box body 1, and three current transformers 4 are fixed on the supporting frame 7.

As shown in fig. 5, the supporting frame 7 includes two first brackets 7-1 symmetrically fixed on the inner wall of the junction box body 1 and oppositely arranged, and two second brackets 7-2 symmetrically arranged and fixed between the two first brackets 7-1, and the current transformer 4 is fixedly connected with the two second brackets 7-2. Preferably, the first bracket 7-1 and the second bracket 7-2 are both inverted L-shaped.

The first bracket 7-1 is welded on the inner wall of the junction box body 1, and the second bracket 7-2 is connected with the first bracket 7-1 and the current transformer 4 is connected with the second bracket 7-2 through bolts.

Three stator lead starting ends 5 are led out of the motor shell 11 into the junction box body 1, and each stator lead starting end 5 passes through the corresponding current transformer 4 and then is connected with the leading-out end of the corresponding first wiring copper bar 2.

Three neutral point leads 8 are led out from the motor housing 11 into the junction box body 1, and each neutral point lead 8 passes through the corresponding current transformer 4 and is fixedly connected with the second wiring copper bar 3.

The cable 6 extends into the junction box body 1 through the metal gram head 12, three cable leads 6-1 are separated at the position of the cable head 6-2 of the cable 6, and the three cable leads 6-1 are fixedly connected with the lead-in ends of the corresponding first wiring copper bars 2 respectively.

When in field wiring, a single armored cable 6 (three cores) passes through the metal gram head 12 at the bottom of the junction box body 1, and is divided into three cable leads 6-1 after being made into a cable head 6-2, and because the initial end 5 of the stator lead passes through the current transformer 4 before being fixed to the first wiring copper bar 2, the field single cable lead 6-1 does not need to pass through the current transformer 4 any more, can be directly fixed on the lead-in end of the first wiring copper bar by using a copper terminal head, and at the moment, the size space of the bottom of the junction box body 1 is large from the first wiring copper bar 2, and the field actual wiring is very convenient.

In conclusion, the junction box structure is compact in structure, convenient to wire, and capable of improving wiring efficiency.

The above examples are provided for illustrating the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the contents of the present utility model and to implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A junction box structure for a current transformer, characterized in that it comprises: The junction box is hollow inside and fixed to the outer wall of the motor housing; Three first copper busbars are fixed to the upper part of the junction box body, and each first copper busbar includes an outgoing end and an incoming end; The second copper busbar is fixed to the lower part of the junction box and is arranged alternately with the three first copper busbars. Three current transformers are fixed inside the junction box and vertically arranged between the three first copper busbars and the second copper busbars; The three stator lead ends are led out from the motor housing to the junction box. Each stator lead end passes through the corresponding current transformer and is fixedly connected to the lead end of the corresponding first copper busbar. Three neutral point leads are led out from the motor housing to the junction box. Each neutral point lead passes through the corresponding current transformer and is fixedly connected to the second copper busbar. The cable extends into the junction box, and the cable is divided into three cable leads at the cable head position. The three cable leads are respectively fixedly connected to the inlet end of the corresponding first copper busbar. 2. The junction box structure of the current transformer according to claim 1, characterized in that: a support frame is provided inside the junction box, and the three current transformers are fixed on the support frame. 3. The junction box structure of the current transformer according to claim 2, characterized in that: the support frame includes two first supports symmetrically fixed on the inner wall of the junction box and arranged opposite to each other, and two second supports fixed between the two first supports and arranged symmetrically, the current transformer being fixedly connected to the two second supports. 4. The junction box structure of the current transformer according to claim 3, characterized in that: the first bracket and the second bracket are inverted L-shaped. 5. The junction box structure of the current transformer according to claim 4, characterized in that: the first bracket is welded to the inner wall of the junction box, and the second bracket is connected to the first bracket and the current transformer is connected to the second bracket by bolts. 6. The junction box structure of the current transformer according to claim 1, characterized in that: the first copper busbar is fixed in the junction box body via the first insulator assembly. 7. The junction box structure of the current transformer according to claim 1, characterized in that: the second copper busbar is fixed in the junction box body via the second insulator assembly. 8. The junction box structure of the current transformer according to claim 1, characterized in that: the first copper busbar is U-shaped. 9. The junction box structure of the current transformer according to claim 1, characterized in that: the second copper busbar is elongated. 10. The junction box structure of the current transformer according to claim 1, characterized in that: the cable is fixed on the junction box via a metal gland.