CN109449040B

CN109449040B - Circuit breaker

Info

Publication number: CN109449040B
Application number: CN201811505048.2A
Authority: CN
Inventors: 吴小钊; 张文凯; 梁利娟; 郅娇娇; 崔宇; 张�杰; 赵洪柏; 孙广涛; 海战胜; 刘源
Original assignee: Xuji Group Co Ltd; XJ Electric Co Ltd; Xuchang XJ Software Technology Co Ltd
Current assignee: Xuji Group Co Ltd; XJ Electric Co Ltd; Xuchang XJ Software Technology Co Ltd
Priority date: 2018-12-10
Filing date: 2018-12-10
Publication date: 2020-12-11
Anticipated expiration: 2038-12-10
Also published as: CN109449040A

Abstract

The present invention relates to a circuit breaker. The circuit breaker includes the casing, installs the explosion chamber in the casing, is equipped with the perforation on the corresponding lateral wall of casing, wears to adorn in the perforation and is fixed with the wall bushing, and the wall bushing includes the conducting rod and encloses the insulating layer outside the conducting rod, and the one end of insulating layer is outwards overhanging outwards to the casing dorsad, and the other end is connected with the explosion chamber electricity conduction to the inside overhang of casing so that the corresponding end of conducting rod, the internal partial seal that lies in outside the casing of insulating layer is equipped with the iron core winding, and the iron core winding cover is established in the conducting rod outside and is made the two form rimless electronic type. The iron core winding is sleeved on the outer side of the conducting rod and forms a passive electronic current sensor together with the conducting rod, so that the power problem of the current sensor is solved, the precision of the current sensor is improved, and the space inside the shell is greatly released.

Description

Circuit breaker

Technical Field

The present invention relates to a circuit breaker.

Background

To improve the reliability of the safe power supply, the circuit breaker is usually connected with a current transformer to detect the current. For example, the watchdog demarcation load switch, namely the circuit breaker, disclosed in chinese patent application publication No. CN104037011A includes a housing, two opposite side walls of the housing are respectively provided with a wire inlet bushing and a wire outlet bushing, an insulating box and an insulating operating mechanism are installed in the housing, a vacuum arc-extinguishing chamber is installed in the insulating box, the wire inlet bushing includes a wire inlet conductive rod, one end of the wire inlet conductive rod extends into the housing and is connected with one end of the vacuum arc-extinguishing chamber, the wire outlet bushing includes a wire outlet conductive rod, one end of the wire outlet conductive rod extends into the housing and is connected with the other end of the vacuum arc-extinguishing chamber to form a conductive loop, and current transformers are respectively installed on two sides of the wire inlet conductive rod and the wire. Because the current transformer needs to meet the requirements of small transformation ratio, large capacity and high precision, the whole size is large, the current transformer occupies a large space after being installed in a shell of the circuit breaker, the internal space of the shell is small, and the structure between each part is compact and the assembly is difficult.

Disclosure of Invention

The invention aims to provide a circuit breaker, which aims to solve the problem that the internal structure of the circuit breaker in the prior art is compact.

In order to achieve the purpose, the technical scheme of the circuit breaker is as follows:

the circuit breaker includes the casing, installs the explosion chamber in the casing, is equipped with the perforation on the corresponding lateral wall of casing, wears to adorn in the perforation and is fixed with the wall bushing, and the wall bushing includes the conducting rod and encloses the insulating layer outside the conducting rod, and the one end of insulating layer is outwards overhanging outwards to the casing dorsad, and the other end is connected with the explosion chamber electricity conduction to the inside overhang of casing so that the corresponding end of conducting rod, the internal partial seal that is located outside the casing of insulating layer is equipped with the iron core winding, and the iron core winding cover is established in the conducting rod outside and is made the two form passive electronic type.

The iron core winding is sleeved on the outer side of the conducting rod and forms a passive electronic current sensor together with the conducting rod, the power problem of the current sensor is solved, the precision of the current sensor is improved, and the space inside the shell is greatly released.

Further, the conducting rod is poured in the insulating layer. Avoid the air gap existing between the conducting rod and the insulating layer to cause the partial discharge value to be larger.

Furthermore, the conducting rod and the iron core winding are integrally poured in the insulating layer. The circuit breaker is prevented from having a gap between the current sensor and the bushing to cause partial discharge, so that the overall partial discharge value of the circuit breaker is prevented from being larger.

Furthermore, the part of the insulating layer, which is positioned outside the shell, is provided with a radial convex ring fixedly connected with the shell, one side end face of the radial convex ring, which is close to the shell, forms a binding face in sealing fit with the shell, and the iron core winding is poured in the radial convex ring. Structural configuration is more reasonable, makes things convenient for being connected of insulating layer and casing, and makes things convenient for the casting shaping.

Furthermore, a shielding ring is poured on the insulating layer at the axial position corresponding to the binding surface, and two ends of the shielding ring are positioned at two sides of the binding surface. The electric field between the shell and the sleeve is homogenized through the shielding ring, and the phenomenon that an air gap exists between the shell and the sleeve to cause a large partial discharge value is avoided.

The insulating layer comprises an epoxy resin layer section and a silicon rubber layer section sleeved outside the epoxy resin layer section. Firstly, guaranteed that the insulating layer has better insulating nature, increase electric current creep distance, secondly improved the insulating rate of overhead line.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment 1 of the present invention;

FIG. 2 is a schematic view of the construction of the wall bushing of FIG. 1;

fig. 3 is a schematic structural diagram of a wall bushing in embodiment 2 of the circuit breaker of the present invention;

in the figure: 1-a shell; 2-an arc extinguishing chamber; 3-a wall bushing; 31-a conductive rod; 311-a linking structure; 32-an insulating layer; 321-epoxy layer section; 322-silicone rubber layer section; 323-radial convex ring; 33-core windings; 34-a shield ring; 35-bolts; 36-a platen; 37-a sealing ring; 41-inner insulating layer; 42-an outer insulating layer; 43-an inner conductive rod; 44-an outer conductive rod; 45-studs; 46-an annular receiving groove; 47-a first gland; 48-second gland.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 2, a circuit breaker according to embodiment 1 of the present invention includes a housing 1, an arc extinguishing chamber 2 is installed in the housing 1, through holes are respectively provided on corresponding side walls of the housing 1, wherein one side of the through holes forms a wire inlet hole, the other side of the through holes forms a wire outlet hole, and a wall bushing 3 is respectively fixedly inserted in the wire inlet hole and the wire outlet hole. The wall bushing has a structure as shown in fig. 2, and includes a conductive rod 31 and an insulating layer 32 surrounding the conductive rod 31, wherein one end of the insulating layer 32 is cantilevered outward away from the housing 1, and the other end is cantilevered inward of the housing 1. One end of the conductive rod 31 located in the housing 1 protrudes out of the corresponding end face of the insulating layer 32, and a connecting structure 311 adapted to the arc extinguish chamber 2 is disposed at one end of the conductive rod 31 located in the housing 1, and the conductive rod 31 is electrically connected to the arc extinguish chamber 2 through the connecting structure 311. The insulating layer 32 is provided with a core winding 33 in a sealing manner at a portion outside the housing 1, and the core winding 33 is sleeved outside the conductive rod 31 to form a passive electronic current sensor together with the conductive rod 31. The conducting rod 31 and the iron core winding 33 are integrally poured in the insulating layer 32, so that the phenomenon that the partial discharge value is large due to the fact that an air gap exists after the conducting rod 31 and the iron core winding 33 are installed is avoided. The part of the insulating layer 32, which is located outside the casing 1, is provided with a radial convex ring 323, the radial convex ring 323 is tightly attached to the casing 1, one side end face of the radial convex ring 323, which is close to the casing 1, forms an attaching face which is attached to the casing 1 in a sealing manner, a sealing ring 37 is arranged at the attaching position, and the sealing attachment is realized through the sealing ring 37. The shell 1 is provided with a bolt 35 which overhangs outwards back to the shell 1, the radial convex ring 323 is fixedly connected with the shell 1 through a pressure plate 36, the pressure plate 36 is provided with a pressing surface which is attached to one end surface of the radial convex ring 323 back to the shell 1, and the pressure plate 36 presses the radial convex ring 323 and then presses the radial convex ring 323 on the shell 1 by screwing a nut. The core windings 33 are cast in the radial collars 323. And a shielding ring 34 is further poured on the insulating layer 32 at the axial position corresponding to the attaching surface, two ends of the shielding ring 34 are positioned at two sides of the attaching surface, and the diameter of the iron core winding 33 is larger than that of the shielding ring 34. The shielding ring 34 is used for homogenizing the electric field between the shell 1 and the sleeve, so that the phenomenon that an air gap exists between the shell 1 and the sleeve to cause a large partial discharge value is avoided. The insulating layer 32 includes an epoxy resin layer 321 and a silicon rubber layer 322 covering the epoxy resin layer 321, and the silicon rubber layer 322 is provided with a shed. Of course, in other embodiments, the silicone rubber layer segments may not be provided, and the insulating layer may be formed by epoxy resin layer segments.

The iron core winding of the circuit breaker is sleeved outside the conductive rod and forms a passive electronic current sensor together with the conductive rod, and the iron core winding is positioned outside the shell of the circuit breaker, namely the passive electronic current sensor is installed outside the shell, so that the power supply problem of the current sensor is solved, the precision of the current sensor is improved, meanwhile, the internal space of the shell is greatly released, the interior of the shell is enabled to be more spacious, the assembly of parts is more convenient, and the assembly efficiency is improved to a certain extent. The shielding ring is poured outside the conducting rod, so that the problem that the partial discharge value of the circuit breaker is large is effectively solved. The length of the conducting rod can be changed to adapt to more main loop connection modes, and the problem that the main loop connection mode in the existing circuit breaker is single is solved.

In the above embodiment 1, the core winding 33 is cast in the insulating layer 32. The core windings may be fixed in other ways than by casting. For example, in embodiment 2, as shown in fig. 3, the insulating layer includes an inner insulating layer 41 and an outer insulating layer 42, an inner conductive rod 43 is cast in the inner insulating layer 41, an outer conductive rod 44 is cast in the outer insulating layer 42, a stud 45 is welded to the housing 1, the inner and outer insulating layers are fixed to the housing 1 through the stud 45, an annular accommodating groove 46 is formed between the inner and outer insulating layers, and the core winding 33 is installed in the annular accommodating groove 46 and sealed by providing a sealing sleeve. During installation, the inner insulating layer 41 and the housing 1 are fixed relatively, then the first sealing sleeve 47 is sleeved on the inner insulating layer 41, then the iron core winding 33 is installed on the inner insulating layer 41 and sleeved with the second sealing sleeve 48, and finally the outer insulating layer 42 and the housing 1 are fixed relatively. After the installation, the core winding 33 is sealed in the insulating layer, and the inner conductive rod 43 and the outer conductive rod 44 are pressed and butted to realize the electrical connection.

In the above embodiment 1, the portion of the insulating layer located outside the housing is provided with the radial protruding ring, and the insulating layer is connected to the housing through the radial protruding ring, and the iron core winding is cast in the radial protruding ring. In other embodiments, the core windings may also be cast in the insulation layer at a position outside the radial bulge loop.

In the above embodiment 1, the conductive rod is cast in the insulating layer. In other embodiments, a radially outwardly protruding boss may be further disposed at one end of the conductive post located in the housing, the boss is in stop fit with one end of the insulating layer located in the housing, a clamping groove is disposed at a position of the conductive post extending out of the insulating layer away from the housing, the conductive post and the insulating layer are relatively fixed by a clamp spring installed in the clamping groove, or the conductive post and the insulating layer are relatively fixed by an end cover having an elastic inner boss, and the elastic inner boss is clamped in the clamping groove on the conductive post.

Claims

1. A circuit breaker comprises a shell, an arc extinguish chamber is arranged in the shell, a through hole is arranged on the corresponding side wall of the shell, a wall bushing is fixedly arranged in the through hole in a penetrating mode and comprises a conducting rod and an insulating layer surrounding the conducting rod, one end of the insulating layer is outwards suspended and extends towards the shell, the other end of the insulating layer is inwards suspended and extends towards the shell, so that the corresponding end of the conducting rod is electrically connected with the arc extinguish chamber, the circuit breaker is characterized in that an iron core winding is hermetically arranged on the part, located outside the shell, in the insulating layer, the iron core winding is sleeved outside the conducting rod to form a passive electronic current sensor, the insulating layer comprises an inner insulating layer and an outer insulating layer, the inner conducting rod is poured in the inner insulating layer, the outer conducting rod is poured in the outer insulating layer, a stud is welded on the shell, the inner insulating layer and the outer, install the iron core winding in the annular holding tank and seal through setting up the seal cover, during the installation, earlier internal insulation layer and casing relatively fixed, then suit first seal cover on the internal insulation layer, later install the iron core winding on the internal insulation layer and the cover establish the second seal cover, at last with external insulation layer and casing relatively fixed, after the installation, the iron core winding is sealed in the insulating layer, interior conducting rod compresses tightly the butt joint with external conducting rod and realizes the electricity and be connected.