CN211980530U

CN211980530U - Electrical insulation device for a current-carrying conductor and circuit breaker having such an insulation device

Info

Publication number: CN211980530U
Application number: CN202020021426.6U
Authority: CN
Inventors: 徐永富; 陆俊谦; 唐芳
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-11-20
Anticipated expiration: 2030-01-03

Abstract

An electrical insulating device for a current-carrying conductor, and a circuit breaker having the same, the electrical insulating device comprising an insulating sleeve for accommodating a plurality of current-carrying conductors, the insulating sleeve comprising a plurality of insulating cavities arranged around an axis, each insulating cavity being defined by an insulating plate in the insulating sleeve and a side wall of the insulating sleeve, the insulating plates of any two adjacent insulating cavities having different heights, a high creepage distance D1 being formed by a higher end surface of the insulating plate, a low creepage distance D3 being formed by a lower end surface of the insulating plate, and a middle creepage distance D2 being formed by the higher insulating plate toward a side surface of the lower insulating plate, the insulating plates of any two adjacent insulating cavities having different heights, the creepage distance between the two adjacent insulating cavities being increased, not only effectively improving the insulation between the insulating cavities, but also not requiring an increase in the thickness of the existing insulating plate, the volume of the existing insulating device is not required to be increased, and the insulating device has the characteristics of small volume and light weight.

Description

Electrical insulation device for a current-carrying conductor and circuit breaker having such an insulation device

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to an electrical insulation device of current-carrying conductor and have this insulating device's circuit breaker.

Background

Since the invention and use of electricity by humans, electricity brings much convenience to humans, and also brings some potential safety hazards to humans, which may burn out electrical appliances, cause fire, or cause electric shock to humans. In order to make people safely use electricity and avoid unnecessary loss, various protectors are produced, wherein one protector is called a circuit breaker with residual current protection, and the residual current protection circuit breaker is commonly called a leakage switch and is a protector used for preventing personal electric shock and electric fire when a circuit or electric appliance is damaged in insulation and short circuit occurs to the ground.

The residual current protection circuit breaker comprises a leakage detection element, a protected phase line and a protected neutral line penetrate through a ring-shaped iron core to form a primary coil N1 of a mutual inductor, a winding wound on the ring-shaped iron core forms a secondary coil N2 of the mutual inductor, when no leakage occurs, the sum of current vectors flowing through the phase line and the neutral line is equal to zero, and if the leakage occurs, the sum of the current vectors is not equal to zero, so that induced electromotive force is generated on a secondary coil N2.

Based on the principle that the phase lines and the neutral lines must penetrate through the annular iron core, the electrical insulation between the phase lines becomes the key of the residual current protection circuit breaker, and the reliable electrical insulation can effectively guarantee the stable operation of the residual current protection circuit breaker in each application occasion.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, insulating linear reliable electrical insulation device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an electric insulation apparatus of current-carrying conductor, it is including the insulating sleeve that holds a plurality of current-carrying conductors, insulating sleeve includes a plurality of insulating chambeies that set up around the axis, every insulating chamber is enclosed by the insulating board in the insulating sleeve and insulating sleeve's lateral wall respectively, the height of the insulating board of arbitrary two adjacent insulating chambeies is different, form high creepage distance D1 through higher insulating board top terminal surface, lower insulating board top terminal surface forms low creepage distance D3, and creep distance D2 in the middle of the side formation of lower insulating board through higher insulating board.

Preferably, each insulation cavity is defined by two insulation plates and the side wall of the insulation sleeve, one end of each insulation plate of the plurality of insulation cavities is located at the axial position of the insulation sleeve and connected with the axial position of the insulation sleeve, and the other end of each insulation plate of the plurality of insulation cavities is connected with the side wall of the insulation sleeve.

Preferably, the insulating sleeve comprises a first cavity, a second cavity, a third cavity and a fourth cavity which are sequentially arranged along the circumferential direction, the height of the insulating plate of the first cavity is higher than that of the insulating plates of the second cavity and the fourth cavity which are adjacent to each other on two sides respectively, the height of the insulating plate of the third cavity is also higher than that of the insulating plates of the second cavity and the fourth cavity which are adjacent to each other on two sides respectively, and the height of the insulating plate of the third cavity is lower than that of the insulating plate of the first cavity.

Preferably, the first cavity and the third cavity are arranged oppositely in the radial direction, the second cavity and the fourth cavity are arranged oppositely in the radial direction, the joint of the insulating plate of the third cavity and the insulating plate of the first cavity is positioned between the insulating plates of the second cavity and the fourth cavity which are arranged oppositely in the radial direction, and the heights of the insulating plates of the second cavity and the fourth cavity are equal.

Preferably, the axis of the insulating sleeve is provided with a cylindrical insulating rod, and the ends of the insulating plates, which are not connected with the insulating sleeve, are respectively connected with the side surfaces of the insulating rod.

Preferably, the insulation sleeve is of an annular structure and comprises four insulation cavities, the four insulation cavities are of fan-shaped structures, each insulation cavity contains one current-carrying conductor, and the outer side wall of the cambered surface of each insulation cavity is in common with the outer side wall of the insulation sleeve.

Preferably, the thickness of the insulating plates is 1.5 mm.

The circuit breaker comprises an electrical insulation device of the current-carrying conductors and four contact systems arranged side by side, wherein the four contact systems are respectively provided with the current-carrying conductors connected with different power lines, the current-carrying conductors of the four contact systems respectively penetrate through an iron core, and the electrical insulation device is arranged on the inner side of the iron core and used for insulation among the current-carrying conductors of the four contact systems.

Preferably, the circuit breaker comprises a housing and a support mounted in the housing, and the electrical insulating device is disposed on the support.

Preferably, the support includes the curb plate, electrical insulation device set up at the middle part of curb plate, the both ends of four contact system's current-carrying conductor are connected with the copper bar respectively, the curb plate corresponds and is equipped with the division board of forming the cambered surface shape in one side of electrical insulation device, when electrical insulation device passed the iron core, the division board was located one side of iron core, one side that the iron core was kept away from to the division board was equipped with the installation mechanism that is used for installing the circuit board, be equipped with at the opposite side of division board with copper bar complex protection machanism.

The utility model discloses an electrical insulation device of current-carrying conductor, the high difference of the insulation board in two arbitrary adjacent insulating chambeies, creepage distance D2 in the middle of the side formation through higher insulation board orientation lower insulation board, make creepage distance between two adjacent insulating chambeies increase, not only can effectively improve the insulating nature between the insulating chamber, need not increase current insulation plate thickness in addition, also need not increase current insulation device's volume, have characteristics small and light in weight

In addition, the heights of the insulating plates of the first cavity and the third cavity are higher than those of the insulating plates of the second cavity and the fourth cavity, but the height of the insulating plate of the third cavity is lower than that of the insulating plate of the first cavity, so that the intermediate creepage distance D2 can be formed between the insulating cavities which are adjacent in the circumferential direction or oppositely arranged in the radial direction, and the insulativity between the insulating cavities is ensured.

In addition, the insulating board height of second cavity and fourth cavity equals, not only can save material, reduces weight, but also can guarantee the biggest effect of the shortest creepage distance between arbitrary two insulating chambeies.

Drawings

Fig. 1 is a schematic structural view of an electrical insulating apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a bracket according to an embodiment of the present invention;

fig. 3 is a schematic view of the electrical insulator and current carrying conductor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 6 is a schematic diagram of the current-carrying conductor and the iron core according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a current-carrying conductor according to an embodiment of the present invention.

Detailed Description

Embodiments of the current-carrying conductor electrical insulation arrangement according to the invention are further described below with reference to the embodiments shown in fig. 1 to 7. The electrical insulation of the current-carrying conductor according to the invention is not limited to the description of the following embodiments.

As shown in fig. 1-3, the electrical insulating device of the present invention includes an insulating sleeve 110 for accommodating a plurality of current-carrying conductors 400, the insulating sleeve 110 includes a plurality of insulating cavities arranged around an axis, each insulating cavity is defined by insulating plates 120 in the insulating sleeve 110 and side walls of the insulating sleeve 110, the heights of the insulating plates 120 of any two adjacent insulating cavities are different, a high creepage distance D1 is formed through the top end surface of a higher insulating plate 120, a low creepage distance D3 is formed through the top end surface of a lower insulating plate 120, and a middle creepage distance D2 is formed through the side surface of the higher insulating plate 120 toward the lower insulating plate 120.

Air is the most common, reliable and cheap electrical insulation medium, and generally, for an air gap of 1mm, the insulation performance can be maintained under a voltage lower than 1200V, and the insulation performance of air is in direct proportion to the size of the air gap. However, after the voltage is increased to the effective value of 2900V, the air can not play an insulation role, a part of solid insulating material can be added in the path of the electric gap to increase the creepage distance, the creepage distance refers to the shortest distance between the two conductive parts along the surface of the insulating material, so that the path of the electric gap is prolonged, the prolonged path increases the electric strength performance, and the whole insulation performance is improved.

The utility model discloses an electrical insulation device, the insulation board 120's of two arbitrary adjacent insulation chambeies high difference, creepage distance D2 in the middle of the side formation of lower insulation board 120 is towards through higher insulation board 120, make creepage distance between two adjacent insulation chambeies increase, not only can effectively improve the insulating nature between the insulation chamber, and need not increase current insulation board 120's thickness (high creepage distance D1+ low creepage distance D3), also need not increase current insulation device's volume, have characteristics small and light in weight.

Preferably, each insulation cavity is respectively defined by two insulation plates 120 and a side wall of the insulation sleeve 110, one end of each insulation plate 120 of the plurality of insulation cavities is respectively located at an axial position of the insulation sleeve 110 and connected to the same, and the other end of each insulation plate 120 of the plurality of insulation cavities is respectively connected to the side wall of the insulation sleeve 110.

As shown in fig. 1-3, the insulating sleeve 110 of the preferred embodiment of the present invention includes four insulating cavities uniformly distributed around the axis of the insulating sleeve 110, and the insulating plates 120 of two circumferentially adjacent insulating cavities are connected, the insulating plates 120 are located in the insulating sleeve 110, and each insulating cavity contains one current-carrying conductor 400. It will be appreciated that the electrical isolation device of the present invention may also include two, three or more isolation chambers. In addition, each insulating cavity can also accommodate a plurality of current-carrying conductors 400, all falling within the scope of the present invention.

Specifically, the four insulation cavities are respectively a first cavity 310, a second cavity 320, a third cavity 330 and a fourth cavity 340 which are sequentially arranged clockwise along the circumferential direction; the height of the insulating plate 120 of the first cavity 310 is higher than that of the insulating plates 120 of the second cavity 320 and the fourth cavity 340 adjacent to both sides, respectively, and the height of the insulating plate 120 of the third cavity 330 is also higher than that of the insulating plates 120 of the second cavity 320 and the fourth cavity 340 adjacent to both sides, respectively, but the height of the insulating plate 120 of the third cavity 330 is lower than that of the insulating plate 120 of the first cavity 310.

One advantage of this embodiment is that the heights of the insulating plates 120 of the first and

third cavities

310 and 330 are higher than those of the insulating plates 120 of the second and

fourth cavities

320 and 340, but the height of the insulating plate 120 of the third cavity 330 is lower than that of the insulating plate 120 of the first cavity 310, so that the intermediate creepage distance D2 can be formed between the insulating cavities arranged adjacently in the circumferential direction or oppositely in the radial direction, and the insulation between the insulating cavities can be ensured.

It can be understood that the shape of the insulating cavity in this embodiment may be changed, the insulating sleeve 110 in this embodiment has a ring-shaped structure, the four insulating cavities are respectively in a sector structure of 90 degrees, and the outer side walls of the arc surfaces of the four insulating cavities are on the same side as the outer side wall of the insulating sleeve 110, but the four insulating cavities may also be in a triangular structure or a quadrilateral structure, or the four insulating cavities are different in shape. In addition, the quantity in insulating chamber of this embodiment also can be changed, for example two semicircular insulating chamber symmetry settings, or three 120 degrees fan-shaped structure's insulating chamber distributes along circumference, all belongs to the utility model discloses a scope of protection. Of course, the shape of the insulating cavities can be changed when the number of the insulating cavities is changed.

Further, the first cavity 310 and the third cavity 330 are arranged opposite to each other in the radial direction, the second cavity 320 and the fourth cavity 340 are arranged opposite to each other in the radial direction, a connection position of the insulating plate 120 of the third cavity 330 and the insulating plate 120 of the first cavity 310 is located between the insulating plates 120 of the second cavity 320 and the fourth cavity 340 which are arranged opposite to each other in the radial direction, and heights of the insulating plates 120 of the second cavity 320 and the fourth cavity 340 are equal. Another advantage of this embodiment is that the heights of the insulating plates 120 of the second cavity 320 and the fourth cavity 340 are equal, which not only saves materials and reduces weight, but also ensures the effect of maximizing the shortest creepage distance between any two insulating cavities.

Referring to fig. 1, the shortest creepage distance between the second cavity 320 and the fourth cavity 340 needs to pass through the top end surface (D1) of the joint of the two insulating plates 120 of the third cavity 330, the side surfaces (D2+ D2) of the two insulating plates 120 of the third cavity 330, and the top end surface (D3) of the joint of the two insulating plates 120 of the second cavity 320 and the fourth cavity 340, and if the heights of the insulating plates 120 of the second cavity 320 or the fourth cavity 340 are increased, one of the intermediate creepage distances D2 is decreased, resulting in the shortest creepage distance being decreased. Certainly, the heights of the insulating plates 120 of the second cavity 320 and the fourth cavity 340 may be different, and the shortest creepage distance between the second cavity 320 and the fourth cavity 340 may also be increased by reducing the height of the insulating plate 120 of the second cavity 320 or the fourth cavity 340 in order to ensure the insulation contact between the second cavity 320 and the fourth cavity 340.

Preferably, the height (D2) of the insulating plate 120 of the first cavity 310 is higher than the height (D2) of the insulating plate 120 of the third cavity 330 than the height (D2) of the insulating plate 120 of the second cavity 320 or the fourth cavity 340, that is, the height (2 xd 2) of the insulating plate 120 of the first cavity 310 is higher than the height (D2) of the insulating plate 120 of the second cavity 320 or the fourth cavity 340, is twice the height (D2) of the insulating plate 120 of the third cavity 330 than the height (D2) of the insulating plate 120 of the second cavity 320 or the fourth cavity 340, equal intermediate creepage distances D2 are formed between the third cavity 330 and the first cavity 310, the second cavity 320 and the fourth cavity 340, respectively, and twice intermediate creepage distances D2 are formed between the first cavity 310 and the second cavity 320 and the fourth cavity 340 on both sides, and between the opposite second cavity 320 and fourth cavity 340, respectively, on the basis of ensuring the shortest creepage distance between any two insulating cavities is the largest, the insulativity between each insulating cavity can be quantified. It is understood that the height of the insulating plate 120 of the first cavity 310 above the insulating plate 120 of the third cavity 330 is not a fixed multiple and can be adjusted within a reasonable range.

Further, the thicknesses of the insulating plates 120 of the four insulating cavities are equal, that is, the high creepage distance D1 is equal to the low creepage distance D3, so that the situation that the charges break through the air across the middle creepage distance D2 due to the smaller thickness of the insulating plates 120 is avoided. Preferably, the thickness of the insulating plate 120 of each of the four insulating cavities is 1.5 mm.

Further, the insulating rod 130 is disposed on the axis of the insulating sleeve 110 in a cylindrical structure, and the other ends of the plurality of insulating plates 120 connected to the insulating sleeve 110 are not directly connected, but are respectively connected to the side surfaces of the insulating rod 130. In this embodiment, the insulating rod 130 having a cylindrical structure is disposed on the axis of the insulating sleeve 110, and the end surface of the top end of the insulating rod 130 and the arc surface protruding from the circumference of the insulating rod 130 not only can further improve the insulation between the plurality of insulating cavities oppositely disposed in the radial direction, but also can improve the structural strength of the insulating plate 120, thereby further improving the reliability.

Specifically, the joint of the two insulating plates 120 of the first cavity 310 is connected to the side surface of one side of the insulating rod 130, the joint of the two insulating plates 120 of the third cavity 330 is connected to the side surface of the other side of the insulating rod 130, and the joints of the two insulating plates 120 of the second cavity 320 and the fourth cavity 340 are respectively connected to the side surfaces of the other two sides of the insulating rod 130. Referring to fig. 1, the shortest creepage distance between the first cavity 310 and the third cavity 330 can be increased whether passing through the end surface of the top end of the insulating rod 130 or passing through the arc surface on the circumference of the insulating rod 130, and the shortest creepage distance between the second cavity 320 and the fourth cavity 340 needs to pass through the arc surface on the circumference of the insulating rod 130, so that the insulation property can be improved. Of course, the insulating rod 130 may also be a rectangular or other polygonal structure, which falls within the scope of the present invention.

As shown in fig. 4-7, the present invention also provides a circuit breaker, including the present invention discloses an electrical insulation device and four contact systems that set up side by side, four contact systems are equipped with the current-carrying conductor 400 that inserts different power cords respectively, and the current-carrying conductor 400 of four contact systems passes iron core 201 respectively, the electrical insulation device set up and be used for insulating between the current-carrying conductor 400 of four contact systems at the inboard of iron core 201.

The utility model discloses a circuit breaker is insulating between four contact system's current-carrying conductor 400 through setting up at the inboard electric insulation device of iron core 201, and the distance is from the breakdown that draws near and lead to when can effectively avoid four contact system's current-carrying conductor 400 to pass iron core 201.

Further, the circuit breaker includes a housing 200 and a holder 202 installed in the housing, and the electrical insulating device is disposed on the holder 202. Specifically, the four contact systems are respectively and sequentially arranged as a neutral line contact system 210, an a contact system 220, a B contact system 230 and a C contact system 240, the iron core 201 is arranged above the a contact system 220 and the B contact system 230 which are arranged in the middle, current-carrying conductors 400 of the four contact systems respectively penetrate through the iron core 201 to form a primary coil N1, two ends of each of the four current-carrying conductors 400 are respectively connected with the corresponding contact system through a copper bar 203, a winding wound on the iron core 201 forms a secondary coil N2 of the transformer, when the circuit breaker works, current passes through the current-carrying conductors 400 of the four contact systems, if leakage occurs, the sum of current vectors is not equal to zero, so that induced electromotive force is generated on N2, and the release is driven to disconnect the four contact systems, thereby realizing leakage protection.

Further, support 202 includes the curb plate, electrical insulation device set up in the middle part of curb plate, the both ends of four contact system's current-carrying conductor 400 are connected with copper bar 203 respectively, the curb plate corresponds and is equipped with cambered surface's division board 204 in one side of electrical insulation device, when electrical insulation device passed iron core 201, division board 204 was located one side of iron core 201, division board 204 kept away from one side of iron core 201 and is equipped with installation mechanism 205 that is used for installing the circuit board, be equipped with at the opposite side of division board 204 with copper bar 203 complex protection machanism 206.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. An electrical insulation arrangement for a current carrying conductor (400), characterized by: including insulating sleeve (110) that holds a plurality of current-carrying conductors (400), insulating sleeve (110) include a plurality of insulating chambeies that set up around the axis, every insulating chamber is enclosed by insulating board (120) in insulating sleeve (110) and the lateral wall of insulating sleeve (110) respectively, the height of insulating board (120) of arbitrary two adjacent insulating chambers is different, form high creepage distance D1 through higher insulating board (120) top terminal surface, lower insulating board (120) top terminal surface forms low creepage distance D3, and form middle creepage distance D2 through higher insulating board (120) towards the side of lower insulating board (120).

2. An electrical insulation arrangement for a current carrying conductor (400) according to claim 1, characterized in that: each insulation cavity is defined by two insulation plates (120) and the side wall of the insulation sleeve (110), one end of each insulation plate (120) of the plurality of insulation cavities is located at the axial position of the insulation sleeve (110) and connected with the insulation sleeve, and the other end of each insulation plate (120) of the plurality of insulation cavities is connected with the side wall of the insulation sleeve (110).

3. An electrical insulation arrangement for a current carrying conductor (400) according to claim 1, characterized in that: the insulating sleeve (110) comprises a first cavity (310), a second cavity (320), a third cavity (330) and a fourth cavity (340) which are sequentially arranged along the circumferential direction, the height of an insulating plate (120) of the first cavity (310) is higher than that of insulating plates (120) of the second cavity (320) and the fourth cavity (340) which are adjacent to each other on two sides respectively, the height of the insulating plate (120) of the third cavity (330) is also higher than that of insulating plates (120) of the second cavity (320) and the fourth cavity (340) which are adjacent to each other on two sides respectively, and the height of the insulating plate (120) of the third cavity (330) is lower than that of the insulating plate (120) of the first cavity (310).

4. An electrical insulation arrangement for a current carrying conductor (400) according to claim 3, characterized in that: the first cavity (310) and the third cavity (330) are arranged oppositely in the radial direction, the second cavity (320) and the fourth cavity (340) are arranged oppositely in the radial direction, the connection position of the insulating plate (120) of the third cavity (330) and the insulating plate (120) of the first cavity (310) is positioned between the second cavity (320) and the insulating plate (120) of the fourth cavity (340) which are arranged oppositely in the radial direction, and the heights of the insulating plates (120) of the second cavity (320) and the fourth cavity (340) are equal.

5. An electrical insulation arrangement for a current carrying conductor (400) according to claim 1, characterized in that: the axis of insulating sleeve (110) is equipped with and is columniform insulating rod (130), and the one end that a plurality of insulating boards (120) are not connected with insulating sleeve (110) is connected with the side of insulating rod (130) respectively.

6. An electrical insulation arrangement for a current carrying conductor (400) according to claim 1, characterized in that: insulating sleeve (110) form annular structure, including four insulating chambeies, four insulating chambeies are the fan-shaped structure of (90) degree respectively, and every insulating chamber holds a current-carrying conductor (400), and the outside lateral wall of the cambered surface in four insulating chambeies shares the limit with the outside lateral wall of insulating sleeve (110).

7. An electrical insulation arrangement for a current carrying conductor (400) according to claim 1, characterized in that: the thickness of the insulating plates (120) is 1.5 mm.

8. A circuit breaker, characterized by: electrical insulation comprising a current-carrying conductor (400) according to any of claims 1-7 and four contact systems arranged side by side, the four contact systems being provided with current-carrying conductors (400) for connection to different power supply lines, and the current-carrying conductors (400) of the four contact systems each passing through the core (201), said electrical insulation being arranged inside the core (201) for insulation between the current-carrying conductors (400) of the four contact systems.

9. The circuit breaker of claim 8, wherein: the circuit breaker comprises a shell (200) and a bracket (202) arranged in the shell, wherein the electric insulation device is arranged on the bracket (202).

10. The circuit breaker of claim 9, wherein: support (202) include the curb plate, electrical insulation device set up the middle part at the curb plate, the both ends of four contact system's current-carrying conductor (400) are connected with copper bar (203) respectively, the curb plate corresponds and is equipped with cambered surface shape's division board (204) in one side of electrical insulation device, when electrical insulation device passed iron core (201), division board (204) are located one side of iron core (201), one side that iron core (201) were kept away from in division board (204) is equipped with installation mechanism (205) that are used for installing the circuit board, be equipped with at the opposite side of division board (204) with copper bar (203) complex protection machanism (206).