阅读说明：本技术 一种具备切负荷电流的跌落式熔断器及安装方法 (Drop-out fuse with load current cutting function and mounting method ) 是由 李冰 王飞鸣 李斌 赵义松 郎福成 吴晗序 刘钧迪 伊文龙 于 2021-07-31 设计创作，主要内容包括：本发明属于配电电力电器产品技术领域,尤其涉及一种具备切负荷电流的跌落式熔断器及安装方法。本发明包括熔断器底座、第一熔断器、第二熔断器及金属部件构成；其中,第一熔断器和第二熔断器并联连接运行,第一熔断器和第二熔断器的两端分别通过金属部件与熔断器底座相接。本发明熔断器具有结构简单,安装方便,易操作的特点,能够提升配电电器产品质量,降低安全隐患,保障作业人员人身安全。本发明熔断器可以通过辅助熄弧管将电弧熄灭,不会造成相间短路和作业人员的人身安全隐患,能够显著提高熔断器切断负载线路的成功率,同时使工作效率也得到显著的提高。(The invention belongs to the technical field of distribution power electrical products, and particularly relates to a drop-out fuse with load current cutting function and an installation method thereof. The fuse comprises a fuse base, a first fuse, a second fuse and a metal component; wherein, first fuse and second fuse parallel connection operation, the both ends of first fuse and second fuse meet through metal parts and fuse base respectively. The fuse has the characteristics of simple structure, convenience in installation and easiness in operation, and can improve the quality of distribution electric appliance products, reduce potential safety hazards and guarantee the personal safety of operating personnel. The fuse disclosed by the invention can extinguish electric arcs through the auxiliary arc extinguishing tube, so that interphase short circuit and the personal safety hidden danger of operators are avoided, the success rate of the fuse for cutting off a load circuit can be obviously improved, and the working efficiency is also obviously improved.)

1. A drop-out fuse with load current cutoff is characterized in that: the fuse comprises a fuse base (3), a first fuse (1), a second fuse (2) and a metal component; wherein, first fuse (1) and second fuse (2) parallel connection operation, the both ends of first fuse (1) and second fuse (2) are met with fuse base (3) through metal part respectively.

2. A drop-out fuse with load current cutoff as set forth in claim 1, wherein: the metal part is a triangular structure, and the metal part comprises: a metal part upper part (4) and a metal part lower part (5).

3. A drop-out fuse with load current cutoff as set forth in claim 1, wherein: two ends of the fuse base (3) are connected with galvanized iron pieces with screw holes, and the galvanized iron pieces and the porcelain insulators are integrally cast and molded; an iron piece at the upper end of the fuse base (3) is connected with the metal component (4) through a hexagon bolt through a fuse base wire inlet end (6); the iron piece at the lower end of the fuse base (3) is connected with the lower part (5) of the metal component through a fuse base outlet end (7).

4. A drop-out fuse with load current cutoff as set forth in claim 2, wherein: three corners of the metal part (4) are respectively connected with a first upper terminal (41), a second upper terminal (42) and a third upper terminal (43), the three terminals are all of a structure with screw holes, and the three terminals and the metal part are integrally cast and formed.

5. A drop-out fuse with load current cutoff as set forth in claim 2, wherein: the above-mentioned

A first upper terminal (41) on the metal component (4) is connected with a wire inlet end (6) of the fuse base, and a second upper terminal (42) and a third upper terminal (43) are respectively connected with upper conducting strips (8) on the first fuse (1) and the second fuse (2).

6. A drop-out fuse with load current cutoff as set forth in claim 2, wherein: the three corners of the lower part (5) of the metal component are respectively connected with a first lower terminal (51), a second lower terminal (52) and a third lower terminal (53), the three terminals are all of a structure with screw holes, and the three terminals and the lower part (5) of the metal component are integrally cast.

7. A drop-out fuse with load current cutoff as set forth in claim 2, wherein: the above-mentioned

The second lower terminal (52) and the third lower terminal (53) of the lower metal part (5) are respectively connected with the lower conducting strips (9) of the first fuse (1) and the second fuse (2), and the first lower terminal (51) is connected with the fuse base outlet end (7).

8. A drop-out fuse with load current cutoff as set forth in claim 1, wherein: the two ends of the first fuse (1) and the second fuse (2) are respectively connected with an upper conducting strip (8) and a lower conducting strip (9);

the upper conducting strip (8) comprises a supporting piece (81), a contact copper sheet (82), a limiting piece (83) and a spring (84), a screw hole is formed in the supporting piece (81), one end of the supporting piece (81) is bent upwards by 90 degrees, a zinc coating is arranged on the surface of the supporting piece (81), one end of the supporting piece (81) is connected with the contact copper sheet (82), and the lower part of the supporting piece (81) is connected with the spring (84) and the limiting piece (83); a screw hole is formed in the contact copper sheet (82), one end of the contact copper sheet (82) is bent upwards by 90 degrees, and a silver coating is arranged on the surface of the contact copper sheet (82);

the lower conducting strip (9) comprises a lower bending plate (91), a supporting piece (92), a trunnion (93) and an expansion pin (94), a screw hole is formed in the lower bending plate (91), a zinc coating is arranged on the surface of the lower bending plate (91), the lower bending plate (91) is connected with the supporting piece (92), and the trunnion (93) is connected with the expansion pin (94).

9. A method for mounting a drop-out fuse with load current shedding is characterized in that: the method comprises the following steps:

step 1, selecting a fuse wire of a fuse;

first fuse rated current I_1nSelecting a rated current of the fuse, wherein the rated current is less than 35% of the rated operation current of the high-voltage side of the transformer;

second fuse rated current I_2nThe rated current of the fuse is selected according to the requirements of the transformer operation regulations, namely: selecting a high-voltage side fuse of a transformer below 100kVA according to 2-3 times of the rated current value of the high-voltage side of the transformer; the high-voltage side fuse of the transformer with the voltage of 100kVA or above is selected according to the rated current value of the high-voltage side of the transformer which is 1.5 to 2 times;

step 2, installing a fuse;

will I_1nThe fuse wire is loaded into the fuse tube of the first fuse, and_2nthe fuse wire is arranged in a fuse tube of the second fuse and the first fuse and the second fuse are fixedly connected with the fuse base;

step 3, operation during load current cutting;

when the line needs to be cut off due to power failure maintenance or fault, the second fuse is pulled out; since the rated current of the fuse wire in the first fuse is smaller than the actual load current of the line, the fuse wire in the first fuse is blown in 10s, and the line is cut off.

10. A method of mounting a drop-out fuse with load shedding as set forth in claim 9, wherein: when the capacity of the transformer is 400kvar, the rated current I of the transformer is_n=23.09A，I_1nIs an 8A fuse, I_2nIs a 40A fuse.

Technical Field

The invention belongs to the technical field of distribution power electrical products, and particularly relates to a drop-out fuse with load current cutting function and an installation method thereof.

Background

The drop-out fuse is widely applied to a high-voltage side of a 10kV overhead distribution transformer or a branch line of a distribution line, has the advantages of simple structure, low manufacturing cost and wide application range, has an obvious disconnection point, has an isolation function, and is widely used at home at present.

The drop-out fuse is mainly used for short circuit and overload protection of the transformer and the line. Because a certain branch needs to be overhauled in a power failure mode, in order to reduce the power failure range as much as possible, the fuse is required to have the function of cutting load current. Although the existing fuse can cut off load current, because the contact of the existing fuse is exposed in the air, electric arcs are easily generated during opening and closing operations, interphase short circuits are easily caused, and unsafe hidden dangers are brought to the personal safety of operating personnel. Although some fuses are additionally provided with arc extinguishing shields, the arc extinguishing effect is not obvious due to the problems of the additionally arranged arc extinguishing shields in the aspects of materials, installation processes and the like, and the problems cannot be avoided.

Therefore, it is necessary to develop a fuse capable of solving the above problems, and it is a new problem that those skilled in the art are continuously developing.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a drop-out fuse with load current cutting function and an installation method thereof. The invention aims to improve the quality of distribution electrical products and guarantee the personal safety of operating personnel.

The technical scheme adopted by the invention for realizing the purpose is as follows:

a drop-out fuse with load current cutting function comprises a fuse base, a first fuse, a second fuse and a metal component; wherein, first fuse and second fuse parallel connection operation, the both ends of first fuse and second fuse meet through metal parts and fuse base respectively.

Further, the metal part is a triangular structure, and the metal part includes: metal parts up and metal parts down.

Furthermore, galvanized iron pieces with screw holes are connected to two ends of the fuse base and are integrally cast with the porcelain insulator; an iron piece at the upper end of the fuse base is connected with the metal component through a hexagon bolt through a wire inlet end of the fuse base; the iron piece at the lower end of the fuse base is connected with the metal component through the wire outlet end of the fuse base.

Furthermore, three bights on the metal parts are connected with first upper terminal, second upper terminal third upper terminal respectively, and three terminals are all to take the screw structure, and are the integrated into one piece with on the metal parts and pour the shaping.

Furthermore, the first upper terminal on the metal component is connected with the wire inlet end of the fuse base, and the second upper terminal and the third upper terminal are respectively connected with the upper conducting strips on the first fuse and the second fuse.

Furthermore, three bights under the metal part are connected with first lower terminal, second lower terminal and third lower terminal respectively, and three terminal is the structure of taking the screw, pours the shaping as an organic whole under with the metal part.

Furthermore, a second lower terminal and a third lower terminal below the metal component are respectively connected with lower conducting strips of the first fuse and the second fuse, and the first lower terminal is connected with a wire outlet end of the fuse base.

Furthermore, two ends of the first fuse and the second fuse are respectively connected with an upper conducting strip and a lower conducting strip;

the upper conducting strip comprises a supporting piece, a contact copper sheet, a limiting piece and a spring, a screw hole is formed in the supporting piece, one end of the supporting piece is bent upwards by 90 degrees, a zinc coating layer is arranged on the surface of the supporting piece, one end of the supporting piece is connected with the contact copper sheet, and the lower part of the supporting piece is connected with the spring and the limiting piece; a screw hole is formed in the contact copper sheet, one end of the contact copper sheet is bent upwards by 90 degrees, and a silver coating is arranged on the surface of the contact copper sheet;

the lower conducting strip comprises a lower bent plate, a supporting piece, a trunnion and an expansion pin, a screw hole is formed in the lower bent plate, a galvanized layer is arranged on the surface of the lower bent plate, the lower bent plate is connected with the supporting piece, and the trunnion is connected with the expansion pin.

A method for mounting a drop-out fuse having a load-shedding function, comprising the steps of:

step 1, selecting a fuse wire of a fuse;

first fuse rated current I_1nSelecting a rated current of the fuse, wherein the rated current is less than 35% of the rated operation current of the high-voltage side of the transformer;

second fuse rated current I_2nThe rated current of the fuse is selected according to the requirements of the transformer operation regulations, namely: selecting a high-voltage side fuse of a transformer below 100kVA according to 2-3 times of the rated current value of the high-voltage side of the transformer; the high-voltage side fuse of the transformer with the voltage of 100kVA or above is selected according to the rated current value of the high-voltage side of the transformer which is 1.5 to 2 times;

step 2, installing a fuse;

will I_1nThe fuse wire is loaded into the fuse tube of the first fuse, and_2nfuse wire installed in second fusingIn a fusion tube of the fuse box, a first fuse and a second fuse are fixedly connected with a fuse base;

step 3, operation during load current cutting;

when the line needs to be cut off due to power failure maintenance or fault, the second fuse is pulled out; since the rated current of the fuse wire in the first fuse is smaller than the actual load current of the line, the fuse wire in the first fuse is blown in 10s, and the line is cut off.

Further, when the capacity of the transformer is 400kvar, the rated current I of the transformer is_n=23.09A，I_1nIs an 8A fuse, I_2nIs a 40A fuse.

The invention has the following beneficial effects and advantages:

the fuse has the characteristics of simple structure, convenience in installation and easiness in operation, and can improve the quality of distribution electric appliance products, reduce potential safety hazards and guarantee the personal safety of operating personnel.

In specific implementation, because the load current is smaller, the fuse disclosed by the invention can extinguish the electric arc through the auxiliary arc extinguishing tube, and cannot cause interphase short circuit and personal safety hidden danger of operating personnel, so that the success rate of the fuse for cutting off a load circuit is greatly improved, and the working efficiency is obviously improved.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a structure on a metal part according to the present invention;

FIG. 3 is a schematic view of the structure under the metal part of the present invention;

FIG. 4 is a schematic view of the structure of the upper conductive sheet of the present invention;

fig. 5 is a schematic structural view of the lower conductive sheet of the present invention.

In the figure:

the fuse comprises a first fuse 1, a second fuse 2, a fuse base 3, a metal component upper 4, a metal component lower 5, a fuse base incoming line end 6, a fuse base outgoing line end 7, an upper conducting strip 8, a lower conducting strip 9, a first upper terminal 41, a second upper terminal 42, a third upper terminal 43, a first lower terminal 51, a second lower terminal 52, a third lower terminal 53, a supporting piece 81, a contact copper sheet 82, a limiting piece 83, a spring 84, a lower bent plate 91, a supporting piece 92, a trunnion 93 and an expansion pin 94.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The solution of some embodiments of the invention is described below with reference to fig. 1-5.

Example 1

The invention provides an embodiment, which is a drop-out fuse with load current cutting function, as shown in fig. 1, fig. 1 is a schematic structural diagram of the invention;

the fuse comprises a fuse base 3, a first fuse 1, a second fuse 2, an upper metal part 4 and a lower metal part 5. Wherein, first fuse 1 and the operation of 2 parallel connection of second fuse, both ends are connected through the bolt respectively through on the metal component 4 and metal component 5 down with the both ends of fuse base 3.

And the two ends of the fuse base 3 are connected with galvanized iron pieces with screw holes, and the galvanized iron pieces and the porcelain insulator are integrally cast and molded. The iron member of fuse base 3 upper end is connected 4 on through fuse base incoming line end 6 with hexagon bolt and the metal part, and the iron member of fuse base 3 lower extreme is connected fixedly through fuse base leading-out terminal 7 and metal part 5 down.

As shown in fig. 2 and 3, fig. 2 is a schematic view of the structure of the metal member of the present invention, and fig. 3 is a schematic view of the structure of the metal member of the present invention.

The upper metal part 4 and the lower metal part 5 are both triangular structures. The metal part of triangle-shaped structure is more stable, and twisting resistance is strong, can effectually avoid first fuse 1 and second fuse 2 to produce the emergence of not hard up problem in the operation process.

The metal member 4 is provided with a first upper terminal 41, a second upper terminal 42, and a third upper terminal 43 at three corners of a triangle. The three terminals are all structures with screw holes and are integrally cast and molded with the triangle.

The first upper terminal 41 of the metal component upper 4 is connected with the fuse base incoming line end 6 through a hexagon bolt, and the second upper terminal 42 and the third upper terminal 43 are respectively connected with the upper conducting strips 8 of the first fuse 1 and the second fuse 2 through hexagon bolts.

The metal member lower 5 is provided with a first lower terminal 51, a second lower terminal 52, and a third lower terminal 53 at three triangular corners, respectively. The three terminals are all structures with screw holes and are integrally cast and molded with the triangle.

The second lower terminal 52 and the third lower terminal 53 are respectively connected with the lower conducting strips 9 of the first fuse 1 and the second fuse 2 through hexagon bolts, and the first lower terminal 51 is connected with the fuse base outlet end 7 through hexagon bolts.

The two ends of the first fuse 1 and the second fuse 2 are respectively connected with an upper conducting plate 8 and a lower conducting plate 9. The first fuse 1 and the second fuse 2 are commercially available products. The upper conductive sheet 8 and the lower conductive sheet 9 can also be similar products with the same size sold in the market, and can be selected according to whether the later-stage products meet the standard requirements or not.

As shown in fig. 4, fig. 4 is a schematic structural view of the upper conductive sheet in the present invention.

The upper conductive sheet 8 includes a supporting member 81, a contact copper sheet 82, a limiting member 83 and a spring 84.

The support member 81 is provided with a screw hole, one end of the left side of the support member 81 is bent upwards by 90 degrees, and the surface of the support member 81 is provided with a zinc coating which is a zinc-plated support member. One end of the supporting member 81 is connected to the contact copper sheet 82. The lower portion of the support 81 connects the spring 84 and the stopper 83. The contact copper sheet 82 is provided with a screw hole, one end of the left end of the contact copper sheet 82 is bent upwards by 90 degrees, and the surface of the contact copper sheet 82 is provided with a silver coating which is a silver-coated contact copper sheet.

As shown in fig. 5, fig. 5 is a schematic structural view of the lower conductive sheet of the present invention.

The lower conductive sheet 9 includes: a lower bent plate 91, a support 92, a trunnion 93 and an expansion pin 94.

The lower bent plate 91 is provided with a screw hole, the surface of the lower bent plate 91 is provided with a zinc coating, and the lower bent plate 91 is a galvanized iron piece. The lower bent plate 91 is connected to a support 92, and the trunnion 93 is connected to an expansion pin 94.

In the invention, during specific connection, an iron piece at the upper end of the fuse base 3 is connected with a first upper terminal 41 on a metal component 4 through a fuse base wire inlet end 6; the iron member at the lower end of the fuse holder 3 is connected and fixed to the first lower terminal 51 of the lower metal member 5 through the fuse holder outlet 7.

The support 81 on the upper conductive plate 8 at one end of the fuse bushing of the first fuse 1 and the second fuse 2 and the left side upwardly bent portion of the contact copper sheet 82 are abutted and fixedly connected to the second upper terminal 42 and the third upper terminal 43 in the metal member 4 by hexagonal bolts, respectively. The upper end cap is compressed by the contact copper sheet 82 by the upper portion of the fuse bushing using a spring 84.

The lower fixing members of the fuse bushings of the first fuse 1 and the second fuse 2 are fixedly connected with the trunnion 93 through the expansion pin 94 on the lower conducting strip 9, and the protruding parts on two sides of the trunnion 93 are clamped in the clamping grooves of the supporting member 92. The lower bent plate 91 and the support 92 are fixed by a hexagonal bolt, and the other end of the lower bent plate 91 is connected and fixed to the second lower terminal 52 and the third lower terminal 53 in the lower metal part 5 by a hexagonal bolt.

Example 2

The invention also provides an embodiment, which is a method for installing the drop-out fuse with load current cutting function.

Taking a distribution transformer with a certain capacity of 400kvar as an example, a drop-out fuse is selected as a protective electrical appliance on a high-voltage side, and the following describes specific implementation steps of the invention with reference to fig. 1, and the specific implementation steps comprise:

and 1, selecting a fuse wire of the fuse.

400kvar capacity distribution transformer with rated current I_n=23.09A, therefore I_1nThe 8A fuse is selected.

Said I_1nThe rated current of the fuse wire of the first fuse is selected to be less than 35% of rated operation current of the high-voltage side of the transformer.

Said I_2nIndicating the fuse rated current, I, of the second fuse_2nThe 40A fuse is selected. And selecting normally according to the transformer operation regulation.

Namely: selecting a high-voltage side fuse of a transformer below 100kVA according to 2-3 times of the rated current value of the high-voltage side of the transformer;

the high-voltage side fuse of the transformer with the voltage of 100kVA or above is selected according to the rated current value of the high-voltage side of the transformer which is 1.5 to 2 times.

The rated current of the fuse has several common specifications of 6.3, 8, 10, 16, 20, 25 and the like, and the type of the fuse can be selected according to the capacity of the transformer.

And 2, installing the fuse.

The fuse tube of the first fuse is filled with the 8A fuse wire, the fuse tube of the second fuse 2 is filled with the 40A fuse wire, the first fuse 1 and the second fuse 2 are connected with the fuse base 3, and the bolts are fixed.

And 3, switching off the load current.

When the circuit needs to be cut off because of power failure maintenance or fault, the maintenance operation personnel utilize the insulator spindle to pull the second fuse 2 open. At this time, since the rated current of the fuse in the first fuse 1 is 8A and the actual line load current is about 20A, the fuse in the first fuse 1 is blown out at 10s according to the ampere-second characteristic curve of the fuse, and the line is cut off. According to the regulations of tables 11 and 12 in GB15166.3-2008, the fuse with normal rated current of 8A is passed with current of about 20A, and the fusing time is about 10S, according to the ampere-second characteristic curve provided by the fuse manufacturer. The specific time range can be determined according to an ampere-second characteristic curve provided by a manufacturer and the actual running current.

Because the load current is less, the fuse can extinguish the electric arc through the auxiliary arc extinguishing tube, and the interphase short circuit and the personal safety hidden danger of operators cannot be caused, so that the success rate of cutting off a load circuit by the fuse is greatly improved.

In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "connected" and "fixed" are to be construed broadly, e.g., "connected" may be a fixed connection, a removable connection, or an integral connection. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated devices or units must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.