阅读说明：本技术 一种电流互感器新型二次短接线 (Novel secondary short-circuit wire of current transformer ) 是由 陈青松 廖翼 代康为 汤卫 伍拥军 龙黔 姜玉文 孙伟 田山 杨颐 熊文 石炳 于 2020-09-30 设计创作，主要内容包括：本发明公开了一种电流互感器新型二次短接线,包括连接盒、短接线与接线头,连接盒包括盒体、绝缘座、接线座、固定螺丝、连接螺丝、连接板、上固定板、固定扣、上固定槽、下固定板、下固定槽、接线孔与螺丝孔,绝缘座固定安装在盒体的背板上,接线座固定安装在绝缘座上,接线孔开设在接线座的中部,螺丝孔垂直于接线孔开设在接线座上,连接螺丝与螺丝孔螺纹连接,连接板通过连接螺丝与螺丝孔固定连接,下固定板固定安装在绝缘座的下方,下固定槽开设在下固定板上,上固定板通过固定扣与下固定板固定安装,本发明解决了短接线存在误碰造成开路风险且端子短接片设置不灵活的问题。(The invention discloses a novel secondary short-circuit wire of a current transformer, which comprises a connecting box, a short-circuit wire and a wire connector, wherein the connecting box comprises a box body, an insulating seat, a wire connector seat, a fixing screw, a connecting screw and a connecting plate, the short-circuit connection structure comprises an upper fixed plate, a fixed buckle, an upper fixed groove, a lower fixed plate, a lower fixed groove, a wiring hole and a screw hole, wherein the insulating base is fixedly installed on a back plate of a box body, the wiring base is fixedly installed on the insulating base, the wiring hole is formed in the middle of the wiring base, the screw hole is formed in the wiring base perpendicular to the wiring hole, the connecting screw is in threaded connection with the screw hole, the connecting plate is fixedly connected with the screw hole through the connecting screw, the lower fixed plate is fixedly installed below the insulating base, the lower fixed groove is formed in the lower fixed plate, and the upper fixed plate is fixedly installed with the lower fixed plate through the fixed buckle.)

1. The utility model provides a novel secondary short-circuit line of current transformer, includes connecting box (1), short-circuit line (2) and connector lug (3), its characterized in that: the connection box (1) comprises a box body (9), an insulation seat (10), a wire holder (11), a fixing screw (12), a connection screw (13), a connection plate (14), an upper fixing plate (15), a fixing buckle (16), an upper fixing groove (17), a lower fixing plate (18), a lower fixing groove (19), a wiring hole (20) and a screw hole (21), wherein the insulation seat (10) is fixedly arranged on a back plate of the box body (9), the wire holder (11) is fixedly arranged on the insulation seat (10), the wiring hole (20) is formed in the middle of the wire holder (11), the screw hole (21) is formed in the wiring seat (11) in a mode of being perpendicular to the wiring hole (20), the connection screw (12) is in threaded connection with the screw hole (21), the connection plate (14) is fixedly connected with the screw hole (21) through the connection screw (13), and the lower fixing plate (18) is fixedly arranged below the insulation seat (10), the lower fixing groove (19) is arranged on the lower fixing plate (18), the upper fixing plate (15) is fixedly installed with the lower fixing plate (18) through the fixing buckle (16), and the upper fixing groove (17) is arranged on the upper fixing plate (15);

the bottom of the connecting box (1) is fixedly installed with one end of the short-circuit wire (2);

the short-circuit wire (2) comprises a metal wire (22), a fire-resistant layer (23), an insulating layer (24), a filler (25), a sheath layer (26), an acid and alkali resistant layer (27) and a wear-resistant layer (28), wherein the fire-resistant layer (23) is wrapped outside the metal wire (22), the insulating layer (24) is wrapped outside the fire-resistant layer (23), the filler (25) is wrapped outside the insulating layer (24), the sheath layer (26) is wrapped outside the filler (25), the acid and alkali resistant layer (27) is wrapped outside the sheath layer (26), and the wear-resistant layer (28) is wrapped outside the acid and alkali resistant layer (27); the other end of the short connecting wire (2) is fixedly installed with the connector lug (3).

2. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the connector lug (3) is including solid fixed ring (4), screw up nut (5), expansion groove (6), fixed foot (7) and be connected copper sheet (8), gu fixed ring (4) and the one end fixed mounting of shorting stub (2), screw up nut (5) and fixed foot (7) threaded connection, the top and solid fixed ring (4) fixed connection of fixed foot (7), expansion groove (6) are seted up between fixed foot (7), connect the inside fixed mounting of copper sheet (8) and fixed foot (7).

3. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the side section of each fixing foot (7) is a right trapezoid with a small upper part and a large lower part, the number of the fixing feet (7) is a plurality, and an expansion groove (6) is arranged between every two adjacent fixing feet (7).

4. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the quantity of wire holder (11) is four, and four wiring holes (20) have all been seted up in every wire holder (11), and connecting plate (14) are through connecting screw (13) and screw hole (21) and four wire holders (11) fixed mounting.

5. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the insulating seat (10) is made of high-alumina porcelain containing alumina.

6. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the fire-resistant layer (23) is a chloroprene rubber layer formed by polymerizing chloroprene serving as monomer emulsion.

7. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the insulating layer (24) is an ethylene propylene rubber layer with good electrical insulation, and the filler (25) is made of soft silica gel.

8. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the sheath layer (26) is a thermoplastic polyurethane elastomer rubber material layer.

9. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the acid and alkali resistant layer (27) is an organic elastic fluorine rubber layer formed by copolymerizing fluorine-containing monomers.

10. The novel secondary short-circuiting wire of current transformer according to claim 1, wherein: the wear-resistant layer (28) is a polyurethane rubber layer formed by polymerizing polyester or polyether and diisocyanate compounds.

Technical Field

The invention relates to the technical field of current transformers, in particular to a novel secondary short-circuit wire of a current transformer.

Background

The current transformer is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. The current transformer is composed of a closed iron core and a winding. The primary side winding of the transformer has few turns and is connected in a circuit of the current to be measured. Therefore, all current of a line always flows through the current transformer, the number of turns of the secondary side winding is large, the secondary side winding is connected in series in the measuring instrument and the protection loop, and the secondary side loop of the current transformer is always closed when the current transformer works, so that the impedance of the series coil of the measuring instrument and the protection loop is small, and the working state of the current transformer is close to a short circuit. The current transformer is used for measuring large current on a primary side by converting the large current on the secondary side into small current on the secondary side, the secondary side can not be opened, and the secondary side of the current transformer is required to be reliably short-circuited to prevent secondary opening to cause high voltage to endanger working personnel and damage related instruments and devices when power failure or uninterrupted operation of the current transformer and regular inspection and test of plant equipment protection devices, safety devices, automation devices, metering devices and the like are carried out according to related national standards and industrial regulations of the current transformer.

However, the existing safety measures are usually simpler and mainly two. Firstly, with the end-to-end short circuit of 3 experimental shorting stub with secondary side A, B, C, N, although this method is simple, there is the mistake and bumps the secondary risk of opening a way that causes current transformer, and extravagant material, do not possess economic nature, security, reliability requirement. And secondly, the short circuit is realized by using a terminal short circuit piece, although the short circuit is reliable, the number of the terminal short circuit terminals is not flexibly arranged, and the defects of reutilization, incapability of meeting actual field requirements and the like are overcome.

Disclosure of Invention

The invention aims to provide a novel secondary short circuit wire of a current transformer, which achieves the purposes of improving the short circuit reliability, reducing unnecessary material waste and simplifying short circuit operation.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a novel secondary shorting stub of current transformer, is including connecting box, shorting stub and connector lug, the connecting box includes box body, insulating seat, connection terminal, fixed screw, connecting plate, an upper fixed plate, fixed knot, goes up fixed slot, bottom plate, lower fixed slot, wiring hole and screw hole, insulating seat fixed mounting is on the backplate of box body, and connection terminal fixed mounting is on insulating seat, and the wiring hole is seted up at the middle part of connection terminal, and screw hole perpendicular to wiring hole is seted up on the connection terminal, connecting screw and screw hole threaded connection, and the connecting plate passes through connecting screw and screw hole fixed connection, and bottom plate fixed mounting is in the below of insulating seat, and the lower fixed slot is seted up on the bottom plate, and an upper fixed plate passes through fixed knot and bottom plate fixed mounting, and the upper fixed slot is seted up on the upper fixed plate.

The bottom of the connecting box is fixedly installed with one end of the short-circuit wire.

The shorting stub includes metal wire, flame retardant coating, insulating layer, filler, restrictive coating, acid and alkali resistant layer and wearing layer, the flame retardant coating parcel is in the outside of metal wire, and the insulating layer parcel is in the outside of flame retardant coating, and the filler parcel is in the outside of insulating layer, and restrictive coating parcel is in the outside of filler, and acid and alkali resistant layer parcel is in the outside of restrictive coating, and the wearing layer parcel is in the outside on acid and alkali resistant layer, the other end and the connector lug fixed mounting of shorting stub.

Particularly, the connector lug includes solid fixed ring, screws up the nut, expansion groove, fixed foot and is connected the copper sheet, gu fixed ring and the one end fixed mounting of shorting stub, screw up nut and fixed foot threaded connection, the top and the solid fixed ring fixed connection of fixed foot, the expansion groove is seted up between the fixed foot, connects the inside fixed mounting of copper sheet and fixed foot.

Particularly, the side section of each fixing foot is a right trapezoid with a small upper part and a large lower part, the number of the fixing feet is several, and an expansion groove is formed between every two adjacent fixing feet.

Particularly, the number of the wire holders is four, each wire holder is provided with four wire connecting holes, and the connecting plate is fixedly installed with the four wire holders through connecting screws and screw holes.

Particularly, the material of the insulating seat is high-alumina porcelain containing alumina.

Particularly, the flame retardant coating uses a chloroprene rubber layer formed by emulsion polymerization of chloroprene as a monomer.

Particularly, the insulating layer uses an ethylene propylene rubber layer with good electrical insulation, and the filler is made of soft silica gel.

In particular, the sheath layer is a thermoplastic polyurethane elastomer rubber material layer.

In particular, the acid and alkali resistant layer is an organic elastic fluororubber layer formed by copolymerizing fluorine-containing monomers.

In particular, the wear-resistant layer uses a polyurethane rubber layer formed by polymerizing polyester or polyether and diisocyanate compounds.

The invention provides a novel secondary short-circuit wire of a current transformer. The method has the following beneficial effects:

(1) according to the invention, the metal wire in the short connection wire is inserted into the wire connection hole through the wire connection seat fixed by the screw, the short connection wire can be fixed only by screwing the fixing screw, the connecting plate is fixedly installed with the screw hole on the wire connection seat through the connecting screw, the four wire connection seats are electrically connected, the short connection wire is connected with the wire connection head and the wiring terminal on the secondary side of the current transformer, so that a secondary side loop of the current transformer is closed, and the upper fixing plate and the lower fixing plate in the connecting box fixedly install one end of the short connection wire in the connecting box through the upper fixing groove and the lower fixing groove.

(2) According to the invention, the metal wire in the short connecting wire is electrically connected with the connecting copper sheet in the connector lug, the connector lug is sleeved on the terminal post on the secondary side of the current transformer, the fastening nut in external thread connection with the fixing pin is screwed downwards through the gradually thickened fixing pin, so that the fixing pin is contracted inwards and tightly clamped with the terminal post, the connector lug is prevented from falling off, and the expansion groove formed between the adjacent fixing pins can ensure that the fixing pin has a large amount of contraction space, so that the connector lug can be suitable for the terminal posts with different diameters.

(3) The sheath layer made of the thermoplastic polyurethane elastomer rubber material is arranged in the short-circuit wire to protect the metal wire and the filler inside the short-circuit wire, the thermoplastic polyurethane rubber material is high in strength and good in elasticity, the sheath layer and the filler can weaken the collision when the short-circuit wire collides, the damage to the short-circuit wire is reduced, meanwhile, the acid-base resistant layer made of the organic elastic fluororubber has excellent acid-base resistance, electrical insulation, mechanical property, chemical corrosion resistance and aging resistance, and the service life of the short-circuit wire is prolonged.

(4) According to the invention, the metal wire in the short-circuit wire is wrapped with the flame retardant coating made of chloroprene rubber and the insulating layer made of ethylene propylene rubber, so that the fireproof performance and the insulating performance of the short-circuit wire are greatly improved, the chloroprene rubber used by the flame retardant coating is not flammable and can be automatically extinguished even after the short-circuit wire is ignited, so that the short-circuit wire cannot cause fire even if short-circuit occurs, the soft short-circuit wire has good fireproof performance, the excellent electrical insulating performance of the ethylene propylene rubber can ensure that short-circuit does not occur between adjacent short-circuit wires, and the arranged soft silica gel filler can further improve the insulating performance and ensure the flexibility of the whole short-circuit wire.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:

FIG. 1 is a front view of the present invention;

FIG. 2 is a block diagram of the junction box of the present invention;

FIG. 3 is a top view of the retaining plate of the present invention;

FIG. 4 is a side cross-sectional view of the wire holder of the present invention;

FIG. 5 is a schematic diagram of the shorting stub of the present invention;

fig. 6 is a structural view of the connector lug of the present invention.

In the figure: the novel copper-clad plate comprises a connecting box 1, a shorting bar 2, a wiring head 3, a fixing ring 4, a screwing nut 5, an expansion groove 6, a fixing pin 7, a connecting copper sheet 8, a box body 9, an insulation seat 10, a wiring seat 11, a fixing screw 12, a connecting screw 13, a connecting plate 14, an upper fixing plate 15, a fixing buckle 16, an upper fixing groove 17, a lower fixing plate 18, a lower fixing groove 19, a wiring hole 20, a screw hole 21, a metal wire 22, a flame retardant coating 23, an insulating layer 24, a filler 25, a sheath layer 26, an acid and alkali resistant layer 27 and a wear-resistant layer 28.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 4, the novel secondary short-circuit wire of the current transformer comprises a connection box 1, a short-circuit wire 2 and a connector lug 3, wherein the connection box 1 comprises a box body 9, an insulation seat 10, a connector lug 11, a fixing screw 12, a connecting screw 13, a connecting plate 14, an upper fixing plate 15, a fixing buckle 16, an upper fixing groove 17, a lower fixing plate 18, a lower fixing groove 19, a connector lug 20 and a screw hole 21, the insulation seat 10 is fixedly installed on a back plate of the box body 9, the insulation seat 10 is made of high-alumina porcelain containing alumina, the insulation seat 10 made of the high-alumina porcelain has higher insulation resistance, compared with the prior art that the connector lug 11 is directly installed on the box body 9, the insulation performance is greatly improved, the connector lug 11 is fixedly installed on the insulation seat 10, the number of the connector lug 11 is four, each connector lug 11 is provided with four connector lugs 20, and the provided multiple connector lugs 20 can be connected with different wires, so that the secondary short-circuit wire can be connected with a plurality of measuring instruments, the connecting plate 14 is fixedly arranged with the four wire holders 11 through the connecting screws 13 and the screw holes 21, the connecting plate 14 is a copper plate, the secondary side short circuit of the current transformer is achieved through the connecting plate 14, the wiring hole 20 is formed in the middle of the wiring base 11, the screw hole 21 is perpendicular to the wiring hole 20 and is formed in the wiring base 11, the connecting screw 12 is in threaded connection with the screw hole 21, the connecting plate 14 is fixedly connected with the screw hole 21 through the connecting screw 13, the lower fixing plate 18 is fixedly installed below the insulating base 10, the lower fixing groove 19 is formed in the lower fixing plate 18, the upper fixing plate 15 is fixedly installed with the lower fixing plate 18 through the fixing buckle 16, the upper fixing groove 17 is formed in the upper fixing plate 15, the upper fixing plate 15 and the lower fixing plate 18 in the connecting box 1 slide through the upper fixing groove 17 and the lower fixing groove 19 to enable one end of the short wiring line 2 to be fixedly installed in.

The bottom of the connecting box 1 is fixedly arranged with one end of the short-circuit wire 2.

As shown in fig. 5, the shorting bar 2 includes a metal wire 22, a fire-resistant layer 23, an insulating layer 24, a filler 25, a sheath layer 26, an acid and alkali resistant layer 27 and a wear-resistant layer 28, the fire-resistant layer 23 is wrapped outside the metal wire 22, the fire-resistant layer 23 is made of chloroprene rubber polymerized by monomer emulsion of chloroprene, the neoprene rubber used in the fire-resistant layer 23 is not flammable but is not flammable, and can be extinguished by itself even after firing, so that fire can not be caused even if the shorting bar 2 is shorted, the shorting bar 2 has good fire-resistant performance, the neoprene rubber has good softness and can not break when being bent, the practicality of the shorting bar 2 is increased, the insulating layer 24 is wrapped outside the fire-resistant layer 23, the filler 25 is wrapped outside the insulating layer 24, the insulating layer 24 is made of ethylene propylene rubber with good electrical insulation, the filler 25 is made of soft silica gel, and the ethylene propylene rubber has good electrical insulation, the insulating layer 24 made of the ethylene propylene rubber can ensure that the short circuit between the adjacent short-circuit wires 2 can not occur, the ethylene propylene rubber used by the insulating layer 24 has high filling property, so the use cost of the ethylene propylene rubber can be reduced, the defect of high price of the ethylene propylene rubber is overcome, the production cost of the short-circuit wires 2 is further reduced, the soft silica gel has good electrical insulation property, the dielectric loss, the voltage resistance, the electric arc resistance, the corona resistance, the volume resistivity, the surface resistivity and the like of the soft silica gel are listed as pioneers in the insulating material, and the electric properties of the soft silica gel are slightly influenced by the temperature and the frequency, so the filler 25 made of the soft silica gel also has excellent electrical insulation property, the sheath layer 26 is wrapped outside the filler 25, the sheath layer 26 is made of thermoplastic polyurethane elastomer rubber material, and the sheath layer 26 made of the thermoplastic polyurethane rubber material has high strength, and the elasticity is also good, sheath layer 26 can weaken and absorb the collision when the collision happens, reduce the damage of the collision to short-circuit wire 2, and greatly prolong the service life of short-circuit wire 2, acid and alkali resistant layer 27 wraps the outside of sheath layer 26, acid and alkali resistant layer 27 is organic elastic fluororubber copolymerized by fluorine-containing monomers, the acid and alkali resistance of fluororubber is the best among oil resistant rubbers, so that acid and alkali resistant layer 27 is made of fluororubber, short-circuit wire 2 has excellent alkali resistance and acid resistance, and the fluororubber used also has good elasticity, can adapt to the service environment of short-circuit wire 2, and ensure that the short-circuit wire 2 cannot crack when in use, wear resistant layer 28 wraps the outside of acid and alkali resistant layer 27, wear resistant layer 28 is made of polyurethane rubber polymerized by polyester or polyether and diisocyanate compounds, the polyurethane rubber used for making wear resistant layer 28 has the highest wear resistance among all rubbers, laboratory test results show that the wear resistance is three to five times that of natural rubber, and is often about ten times as high in practical application, so that the wear-resistant layer 28 can well protect all structures inside the short-circuit wire 2.

The other end of the short-circuit wire 2 is fixedly arranged with the connector lug 3.

As shown in fig. 6, the connector lug 3 comprises a fixing ring 4, a tightening nut 5, an expansion groove 6, a fixing pin 7 and a connecting copper sheet 8, the fixing ring 4 is fixedly installed at one end of the shorting bar 2, the tightening nut 5 is in threaded connection with the fixing pin 7, the top of the fixing pin 7 is fixedly connected with the fixing ring 4, the side section of the fixing pin 7 is a right trapezoid with a small upper part and a large lower part, the number of the fixing pins 7 is several, the expansion groove 6 is arranged between the adjacent fixing pins 7, the expansion groove 6 is arranged between the fixing pins 7, the connecting copper sheet 8 is fixedly installed with the inside of the fixing pin 7, the metal wire 22 in the shorting bar 2 is electrically connected with the connecting copper sheet 8 in the connector lug 3, the connector lug 3 is sleeved on a terminal on the secondary side of the current transformer, the tightening nut 5 in external thread connection with the fixing pin 7 through gradually thickening the fixing pin 7 is screwed downwards, so that the fixing pin 7 is shrunk inwards and tightly clamped with the, prevent that connector lug 3 from dropping, and the expansion groove 6 of seting up between adjacent fixed foot 7 can guarantee that fixed foot 7 possess a large amount of shrink spaces for connector lug 3 can be suitable for the terminal of different diameters.

When in use, one end of the short connecting wire 2 is fixedly arranged in the connecting box 1 by sliding the upper fixing plate 15 and the lower fixing plate 18 in the connecting box 1 through the upper fixing groove 17 and the lower fixing groove 19, metal wires 22 in the four short connecting wires 2 are respectively connected with the four wire holders 11, the wire holders 11 are short-circuited through the connecting plates 14, the wire connector 3 is fixedly arranged with a binding post on the secondary side of the current transformer, the wire connector 3 is sleeved on the binding post on the secondary side of the current transformer, the fixing pin 7 is screwed downwards through the screwing nut 5 which is in threaded connection with the fixing pin 7 and is gradually thickened, so that the fixing pin 7 is contracted inwards and clamped with the binding post, the wire connector 3 is prevented from falling off, the metal wires 22 can conduct electricity, the fire-fighting layer 23 can prevent fire, the insulating layer 24 can prevent the metal wires 22 from short-circuiting, and meanwhile, the filler 25 also has excellent electric insulation property, and filler 25 can also protect metal wire 22, restrictive coating 26 has good elasticity, still has very high intensity, when stub 2 bumps or sharp object puncture, restrictive coating 26 can protect stub 2, prevent stub 2 damage, acid and alkali resistant layer 27 prevents stub 2 from suffering the corruption of strong acid and alkali, improves the life of stub 2, wearing layer 7 can prevent that stub 2 from taking place wearing and tearing in installation and use.

In conclusion, the invention can fix the metal wire 22 in the short connecting wire 2 and the inserted connecting wire hole 20 by screwing the fixing screw 12 through the wire holder 11 fixed by screws, the connecting plate 14 is fixedly installed with the screw hole 12 on the wire holder 11 through the connecting screw 13, the four wire holders 11 are electrically connected, the short connecting wire 2 is connected with the wire connector 3 and the post terminal on the secondary side of the current transformer, so that the secondary side loop of the current transformer is closed, the upper fixing plate 15 and the lower fixing plate 18 in the connecting box 1 fixedly install one end of the short connecting wire 2 in the connecting box 1 through the upper fixing groove 17 and the lower fixing groove 19, the metal wire 22 in the short connecting wire 2 is electrically connected with the connecting copper sheet 8 in the wire connector 3, the wire connector 3 is sleeved on the post terminal on the secondary side of the current transformer, the screwing nut 5 connected with the external thread of the fixing pin 7 through the gradually thickened fixing pin 7 is screwed downwards, make fixed foot 7 contract inwards and with the terminal chucking, prevent that connector lug 3 from dropping, and the expansion groove 6 of seting up between the adjacent fixed foot 7 can guarantee that fixed foot 7 possess a large amount of contraction spaces, make connector lug 3 can be suitable for the terminal of different diameters, protect metal wire 22 and filler 25 inside the shorting stub 2 through the restrictive coating 26 that sets up thermoplastic polyurethane elastomer rubber material and make in shorting stub 2, thermoplastic polyurethane rubber material not only intensity is high, and elasticity is also very good, restrictive coating 26 and filler 25 can weaken the collision when bumping into, reduce the injury to shorting stub 2, simultaneously, acid and alkali resistant layer 27 that uses organic elastic fluororubber to make, have excellent acid and alkali resistance, electric insulation, mechanical properties, chemical corrosion resistance, ageing resistance is also very good, increase the life of shorting stub 2, through wrap up flame retardant coating 23 and the ethylene propylene rubber that chloroprene rubber made on the metal wire 22 in the shorting stub 2 and make insulating layer 24, make the fire behavior of shorting stub 2 and the great promotion of insulating properties, the chloroprene rubber that flame retardant coating 23 used is not nevertheless incombustible, also can extinguish by oneself even catch fire, so even shorting stub 2 takes place the short circuit and can not arouse the conflagration, make shorting stub 2 possess good fire behavior, the good electrical insulation of ethylene propylene rubber can guarantee can not take place the short circuit between the adjacent shorting stub 2, and the soft silica gel filler 25 that sets up more can further promote insulating properties, and guarantee the compliance of whole shorting stub 2.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.