CN205069352U - Electric leakage circuit breaker is with through -type zero sequence mutual -inductor - Google Patents

Abstract

The utility model discloses a straight-through zero-sequence transformer for leakage circuit breakers. Including iron core, enamelled coil, shell, connecting copper bar and circuit breaker base, the enameled coil as the signal line is wound on the iron core, the iron core is a ring structure, the iron core is placed in the shell, and multiple connecting copper bars run through the iron core In the annular central hole, the connecting copper bars and the iron core are installed in the circuit breaker base, and a plurality of connecting copper bars are evenly spaced and installed in the annular central hole of the iron core along the axial direction. The utility model improves the passing ability of the conductive copper bar, solves the problem that the conductive copper bar can only pass through the zero-sequence transformer after welding, repeated bending, and segmental connection, improves the production efficiency, and reduces the heat generation of the circuit breaker. The reliability of the safe operation of the leakage circuit breaker in the circuit is enhanced.

Description

A straight-through zero-sequence transformer for leakage circuit breakers

technical field

The utility model relates to a detection element in an application circuit, in particular to a straight-through zero-sequence transformer for a leakage circuit breaker, which is matched with the leakage circuit breaker.

Background technique

As one of the main components of the leakage circuit breaker, the zero-sequence transformer is embedded in the leakage circuit breaker housing or installed outside the leakage circuit breaker housing in combination. When a certain degree of dangerous leakage current appears in the protected circuit, the leakage circuit breaker will trip quickly and cut off the power supply to achieve the purpose of protection. At present, the zero-sequence transformer is a ring, mainly composed of a ring iron core and an enameled coil plus a shell, wherein the enameled coil includes a test winding and a sampling winding. The annular iron core is widely used in current leakage circuit breakers because of its simple processing technology, uniform magnetic field distribution, and stable performance of various parameters. The installation method is generally inserted vertically on the base of the leakage circuit breaker. The key is that, The conductive copper bar in the leakage circuit breaker needs to pass through the inner circle of the ring zero-sequence transformer to obtain the sampling signal.

During the assembly process of the leakage circuit breaker, the conductive copper bar can pass through the inner circle of the ring zero-sequence transformer after being welded, bent repeatedly, and connected in sections. However, the area of the inner circle of the annular zero-sequence transformer is limited, causing the electrical gap between the conductive copper bars passing through the inner circle to be too small. To solve this problem, manufacturers often add some insulation protection measures on the conductive copper bars. Such as: sets of insulating sleeves, winding insulating tape, etc. However, in the actual use of leakage circuit breakers, due to changes in the environment, current, and voltage, high temperature rises or interphase insulation damage occur from time to time, which affects the safe operation of leakage circuit breakers in the circuit. If the area size of the ring-shaped zero-sequence transformer passing through the conductive copper bar is intentionally increased, a series of problems such as changes in the dimensions of the leakage circuit breaker and the installation of the distribution box will inevitably occur.

Utility model content

In order to overcome the deficiencies and defects in the background technology, the utility model provides a straight-through zero-sequence transformer for leakage circuit breakers, which solves the problem that the gap between the conductive copper bars is too small due to the limited inner circle area of the existing zero-sequence transformer It can be used for the leakage circuit breaker base with a built-in slot for the straight-through zero-sequence transformer, which solves the shortcomings of the existing leakage circuit breaker with complex structure and waste of conductive materials.

The technical scheme that the utility model realizes is:

The utility model includes an iron core, an enamelled coil, a casing and connecting copper bars. The enamelled coil as a signal line is wound on the iron core. The iron core is in a ring structure, and the iron core is placed in the outer shell. In the center hole of the circuit breaker, the connecting copper bar and iron core are installed in the base of the circuit breaker.

The plurality of connecting copper bars are installed in the annular center hole of the iron core along the axial direction at intervals.

The iron core is a flat oval ring structure.

The enameled coil is provided with a signal lead-out line, and the signal lead-out line passes through the casing.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model mainly solves the problem that the gap between the conductive copper bars is too small due to the limitation of the connected shape of the circular zero-sequence transformer used in the existing leakage circuit breaker, and the application of the zero-sequence transformer makes the structure of the leakage circuit breaker complicated, resulting in The circuit breaker generates too much heat during use and wastes conductive materials.

The zero-sequence transformer of the utility model is a straight-through type. The straight-through zero-sequence transformer improves the passing ability of the conductive copper bars, increases the electrical gap between the conductive copper bars, simplifies the assembly process of the leakage circuit breaker, and solves the problem of The conductive copper bar needs to be welded, repeatedly bent, and segmented to pass through the zero-sequence transformer, which saves copper, simplifies the process, improves production efficiency, and reduces the heat generation of the circuit breaker. The reliability of the safe operation of the leakage circuit breaker in the circuit is enhanced.

Description of drawings

Fig. 1 is a schematic diagram of the iron core structure of the present invention.

Fig. 2 is a schematic front view of the housing of the utility model.

Fig. 3 is a top view of the through installation of the connecting copper bar of the present invention.

Fig. 4 is an assembly diagram of the utility model installed in a circuit breaker.

In the figure: 1. Iron core, 2. Enameled coil, 3. Shell, 4. Connecting copper bar, 5. Circuit breaker base.

detailed description

Embodiments of the utility model are further described below in conjunction with the accompanying drawings:

As shown in Figure 4, the utility model includes an iron core 1, an enameled coil 2, a casing 3 and a connecting copper bar 4, and the enameled coil 2 as a signal line is wound on the iron core 1, as shown in Figure 1, the iron core 1 is Ring structure, the iron core 1 is placed in the shell 3, as shown in Figure 2, a plurality of connecting copper bars 4 run through the annular center hole of the iron core 1, and the connecting copper bars 4 and the iron core 1 are installed in the circuit breaker base 5, The circuit breaker base 5 is provided with a built-in groove.

The iron core 1 is a flat oval ring structure, the enameled coil 2 is provided with a signal lead-out line, and the signal lead-out line passes through the shell 3, and a plurality of connecting copper bars 4 are evenly spaced and installed in the ring-shaped center hole of the iron core 1 along the axial direction. As shown in Figure 3.

The iron core of the straight-through zero-sequence transformer is made of nano-magnetic materials, which are wound on an oblate mold. match between each other. The iron core is placed in the casing, and the signal line is connected to the outlet at the upper end of the casing.

As shown in Figure 4, four connecting copper bars (or three) run through the iron core, and the two ends can be fixed to the wiring board of the circuit breaker base, as a supporting use for four-pole leakage circuit breakers (or three-pole leakage circuit breakers) .

Place the straight-through zero-sequence transformer of the present invention in the base of the leakage circuit breaker with a built-in groove, and provide upper and lower terminals that run through the copper bars, which can improve the passing ability of the conductive copper bars and increase the size of each conductive copper bar The electrical gap between them simplifies the assembly process of the leakage circuit breaker, solves the problem that the conductive copper bar needs to be welded, repeatedly bent, and segmented to pass through the zero-sequence transformer, saves copper, and simplifies the process. The production efficiency is improved, and the heat generation of the circuit breaker is reduced, thereby enhancing the reliability of the safe operation of the leakage circuit breaker in the circuit.

The embodiment should not be regarded as limiting the utility model, but any improvement based on the spirit of the utility model should be within the protection scope of the utility model.

Claims (4)

1. the through-type zero-sequence transformer of residual current circuit breaker, it is characterized in that: comprise iron core (1), enameled wire loop (2), shell (3) and be connected copper bar (4), enameled wire loop (2) as holding wire is wound on iron core (1), iron core (1) is loop configuration, iron core (1) is placed in shell (3), multiple connection copper bar (4) is run through in the centre bore of iron core (1) annular, and connection copper bar (4) and iron core (1) are arranged in circuit breaker base (5).

2. the through-type zero-sequence transformer of a kind of residual current circuit breaker according to claim 1, is characterized in that: described multiple connection copper bars (4) are in axial direction arranged on the centre bore of iron core (1) annular uniformly at intervals.

3. the through-type zero-sequence transformer of a kind of residual current circuit breaker according to claim 1, is characterized in that: the loop configuration that described iron core (1) is flat ellipse.

4. the through-type zero-sequence transformer of a kind of residual current circuit breaker according to claim 1, is characterized in that: described enameled wire loop (2) is provided with signal lead-out wire, and signal lead-out wire passes shell (3).