CN209029230U - A kind of zero sequence current mutual inductor - Google Patents

Abstract

Originally practical to disclose a kind of zero sequence current mutual inductor with novel, including plastic casing, wind the iron core of type insulating wrapping strip and coil, shield assembly and conducting wire, the line end of conducting wire is connected with the end of a thread of coil, plastic casing side has the wire connecting portion outwardly protruded, several crossed beam trunkings are formed at the top of wire connecting portion, step is formed on the inside of wire connecting portion, the plug wire hole being arranged in a one-to-one correspondence with each crossed beam trunking is formed on step, short slot is formed on the inside of each plug wire hole, the bottom of short slot is higher than the bottom of plug wire hole, conducting wire penetrates plastic casing by crossed beam trunking, the line end of conducting wire is inserted into plug wire hole bottom, the end of a thread of coil protrudes into plug wire hole by short slot, it is connected with the line end of the conducting wire.The utility model it is structurally reasonable, the line end of conducting wire is constrained, the line end of conducting wire is avoided to contact with shield assembly and short circuit occurs；Zero sequence current mutual inductor be fixedly mounted in circuit breaker housing it is convenient and reliable, have good using effect.

Description

A kind of zero sequence current mutual inductor

Technical field

The utility model relates to a kind of zero sequence current mutual inductors, belong to mutual inductor field of structural design.

Background technique

In compressing field residual current action breaker, zero sequence current mutual inductor is as detection residual current (electric leakage letter Number) critical elements, zero sequence current mutual inductor electric system generate zero sequence earth current when with protective relaying device or signal It is used cooperatively, acts device element, realize protection or monitoring.It is disclosed in patent document CN206480496U a kind of for moulding The zero sequence current mutual inductor of case circuit breaker including insulating boot, the insulating cover being oppositely arranged with insulating boot, is successively set on insulating boot Lower shield assembly between insulating cover, shielding mutual inductance unit and upper shield assembly, the shielding mutual inductance unit include with absolutely Internal shield ring that edge cover is arranged concentrically, the iron core and external screen for being wound with coil being sequentially sleeved on internal shield ring from inside to outside Circle is covered, the internal shield ring, iron core are identical as the height of external shield circle, and the insulating boot is equipped with the terminals outwardly protruded, Wiring hole is offered on the terminals, the insulating cover is equipped with lead wire press head compatible with terminals.Above patent document In zero sequence current mutual inductor in actual use, the line end of conducting wire is protruded into insulating boot and is connect with the end of a thread of coil, however Due to not limited constraint to the line end of conducting wire, the line end of conducting wire is easy to be upturned (specific with shield assembly in turn It is external shield circle) contact, once and conducting wire contacts that it will cause short circuits with shield assembly；And zero-sequence current is mutual in the prior art General to be fixedly mounted by four fixed screws when sensor is fixed in circuit breaker housing, installation operation is relatively complicated.It is based on This, there is also places to be modified for the structure of existing zero sequence current mutual inductor.

Utility model content

In this regard, the utility model is intended to provide a kind of structurally reasonable zero sequence current mutual inductor, conducting wire can be effectively avoided Line end contacts with shield assembly and short circuit occurs, and reduces the number of components for constituting shield assembly, is conducive to assemble.

Realizing the technical solution of the utility model aim is:

A kind of zero sequence current mutual inductor, including plastic casing, iron core, shield assembly and conducting wire are wound on the iron core Coil and type insulating wrapping strip, the shield assembly are set to outside the iron core, and are loaded in the plastic casing, the line of the conducting wire End is connected with the end of a thread of the coil, the plastic casing side with the wire connecting portion that outwardly protrudes, the wire connecting portion top at Type has several crossed beam trunkings, and step is formed on the inside of the wire connecting portion, and the overhead height of the step is not higher than the crossed beam trunking Bottom level, form the plug wire hole being arranged in a one-to-one correspondence with each crossed beam trunking on the step, on the inside of each plug wire hole at Type has short slot, and the bottom of the short slot is higher than the bottom of the plug wire hole, and the line end of the conducting wire is inserted into the plug wire hole bottom, The conducting wire passes through the plastic casing by the crossed beam trunking, and the end of a thread of the coil protrudes into the plug wire by the short slot Hole；The shield assembly includes lower shielding piece, upper shielding piece, internal shield ring and external shield circle, the lower shielding piece, upper shielding An annular space is formed between piece, internal shield ring and external shield, the iron core is set in the annular space, the lower shielding Piece, the internal shield ring and the external shield circle are integrated punch forming, and the end of a thread of the coil is by the upper shielding piece and institute The gap stated between external shield circle passes through, and spacer material layer is arranged at the gap, and the spacer material layer is by the coil The end of a thread be isolated with the lower shielding piece and the external shield circle, the plastic casing bottom is equipped with platform, passes through on the platform It wears and is equipped with installation jack, be equipped with metal stator in the installation jack, described in the both ends of the metal stator are stretched out It perforates equipped with screw the part for installing jack.

In above-mentioned technical proposal, external shield circle position corresponding with the wire connecting portion is wound with insulating layer.

In above-mentioned technical proposal, the insulating layer and the spacer material layer are insulating tape.

In above-mentioned technical proposal, the iron core and the shield assembly are encapsulated in the plastic casing by insulating cement.

The utility model has the effect of positive: using the structure in the utility model, by the line of coil in assembling process Head connect with the line end of conducting wire after by conducting wire insertion plug wire hole, and the line end of conducting wire is made to reach the bottom (line of the plug wire hole The end of a thread of circle in short slot by passing through), and since the bottom of short slot is higher than the bottom of plug wire hole, the line end of conducting wire reaches plug wire Line end can be formed and be constrained behind the bottom of hole, so that the line end of conducting wire be avoided to deviate from, effectively avoid line end tilting and the external screen of conducting wire It covers circle contact and causes short circuit；, it is specified that screw is perforated across screw when furthermore current transformer being fixed in circuit breaker housing 18 are fixed with the screw hole cooperation in circuit breaker housing inner bottom wall, it is only necessary to which two fixed screws can be reliably fixed, and be compared Four fixed screw fixed current mutual inductors are used in the prior art, reduce two fixed screws, it is easier for installation.

Detailed description of the invention

Fig. 1 is the top view of zero sequence current mutual inductor in the utility model；

Fig. 2 is the cross-sectional view of the line A-A cutting along Fig. 1；

Fig. 3 is the perspective view of plastic casing in the utility model；

Fig. 4 is the top view of plastic casing shown in Fig. 3；

Fig. 5 is the cross-sectional view of this line B-B cutting along Fig. 4；

Fig. 6 is the structural schematic diagram of iron core in the utility model；

Fig. 7 is the front view of metal stator in the utility model.

Appended drawing reference as shown in the figure are as follows: 1- plastic casing；2- iron core；3- conducting wire；4- the end of a thread；5- wire connecting portion；6- crosses line Slot；7- step；8- plug wire hole；9- short slot；Piece is shielded under 10-；Piece is shielded on 11-；12- insulating layer；13- internal shield ring；14- External shield circle；15- platform；16- installs jack；17- metal stator；18- spacer material layer.

Specific embodiment

The specific structure in the utility model is done to illustrate with reference to the accompanying drawings of the specification:

A kind of zero sequence current mutual inductor, as shown in Figures 1 to 7 comprising plastic casing 1, iron core 2, shield assembly and lead Line 3 is wound with coil and type insulating wrapping strip on the iron core 2, and the shield assembly is set to outside the iron core 2, and loaded on described In plastic casing 1,1 side of plastic casing has the wire connecting portion 5 outwardly protruded, forms at the top of the wire connecting portion 5 several Crossed beam trunking 6, is formed with step 7 on the inside of the wire connecting portion 5, and the overhead height of the step 7 is not higher than the bottom of the crossed beam trunking 6 Portion's height, forms the plug wire hole 8 being arranged in a one-to-one correspondence with each crossed beam trunking 6 on the step 7, each 8 inside of plug wire hole at Type has short slot 9, and the bottom of the short slot 9 is higher than the bottom of the plug wire hole 8, and the line end of the conducting wire 3 is inserted into the plug wire hole 8 Bottom, the conducting wire 3 penetrate the insulation shell 1 by the crossed beam trunking 6, and the line end of the conducting wire 3 is inserted into 8 bottom of plug wire hole The end of a thread 4 in portion, the coil protrudes into the plug wire hole 8 by the short slot 9, and described the end of a thread 4 is connected with the line end；Institute Stating shield assembly includes lower shielding piece 10, upper shielding piece 11, internal shield ring 13 and external shield circle 14, the lower shielding piece 10, on An annular space is formed between shielding piece 11, internal shield ring 13 and external shield circle 14, the iron core 2 is set to the annular space Interior, the lower shielding piece 10, the internal shield ring 13 and the external shield circle 14 are integrated punch forming, the end of a thread of the coil 4 are passed through by the gap between the upper shielding piece 11 and the external shield circle 14, and spacer material layer is arranged at the gap 18, the spacer material layer 18 is isolated by the end of a thread 4 of the coil with the lower shielding piece 10 and the external shield circle 14, described 1 bottom of plastic casing is equipped with platform 15, and installation jack 16 is provided through on the platform 15, is worn in the installation jack 16 There is metal stator 17, the part that the installation jack 16 is stretched out at the both ends of the metal stator 17 is perforated equipped with screw. Using the structure in the present embodiment, conducting wire 3 is inserted into after connecting the end of a thread of coil 4 with the line end of conducting wire 3 in assembling process and is inserted In string holes 8, and the line end of conducting wire is made to reach the bottom (the end of a thread of coil in short slot 9 by passing through) of the plug wire hole, and due to lacking The bottom of slot 9 is higher than the bottom of plug wire hole 8, therefore can be formed and be constrained to line end behind line end arrival 8 bottom of plug wire hole of conducting wire 3, To avoid the line end of conducting wire from deviating from, effectively avoids the line end of conducting wire 3 from tilting and contacted with external shield circle 14 and cause short circuit, pass through The setting of spacer material layer 18 can be avoided the end of a thread and contact with lower shielding piece 10 and external shield circle 14, winding insulation outside coil Band avoids coil from contacting with shield assembly；When furthermore current transformer being fixed in circuit breaker housing, fixed screw is passed through Screw perforation is fixed with the screw hole cooperation in circuit breaker housing inner bottom wall, it is only necessary to which two fixed screws can reliably be consolidated It is fixed, four screws are set compared to the prior art on shell and are perforated, and use four fixed screw fixed current mutual inductor phases Than the scheme in the present embodiment reduces two fixed screws, easier for installation quick.

In the present embodiment, the upper shielding piece 11 is set as multilayered structure, to reinforce shield effectiveness.

In the present embodiment, the external shield circle 14 position corresponding with the wire connecting portion 5 is wound with insulating layer 12, by 14 corresponding site of external shield circle winding insulating layer 12 is not contacted with the line end for further ensuring that conducting wire with external shield circle 14.

In the present embodiment, the insulating layer 12 and the spacer material layer 18 are insulating tape, and spacer material layer is by line Corresponding site is wound on head.

In the present embodiment, the iron core 2 and the shield assembly are encapsulated in the plastic casing 1 by insulating cement, It, will be described by way of the encapsulating in plastic casing 1 after iron core 2 and shield assembly are packed into plastic casing 1 when assembling Iron core 2 and shield assembly encapsulation are fixed, and can save insulating cover in this way.

Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments Exhaustion.And the obvious changes or variations that these connotations for belonging to the utility model are extended out still fall within it is practical Novel protection scope.

Claims (3)

1. a kind of zero sequence current mutual inductor, including plastic casing (1), iron core (2), shield assembly and conducting wire (3), the iron core (2) coil and type insulating wrapping strip are wound on, it is external that the shield assembly is set to the iron core (2), and is loaded on the plastic casing (1) in, which is characterized in that plastic casing (1) side has the wire connecting portion (5) outwardly protruded, wire connecting portion (5) top Several crossed beam trunkings (6) are formed, are formed with step (7) on the inside of the wire connecting portion (5), the overhead height of the step (7) is not Higher than the bottom level of the crossed beam trunking (6), forms on the step (7) and inserted with what each crossed beam trunking (6) was arranged in a one-to-one correspondence String holes (8), each plug wire hole (8) inside form short slot (9), and the bottom of the short slot (9) is higher than the plug wire hole (8) Bottom, the conducting wire (3) are penetrated the plastic casing (1) by the crossed beam trunking (6), described in the line end insertion of the conducting wire (3) The end of a thread (4) of plug wire hole (8) bottom, the coil protrudes into the plug wire hole (8) by the short slot (9), with the conducting wire (3) line end is connected；The shield assembly includes lower shielding piece (10), upper shielding piece (11), internal shield ring (13) and external shield It encloses (14), forms an annular between the lower shielding piece (10), upper shielding piece (11), internal shield ring (13) and external shield circle (14) Space, the iron core (2) be set to the annular space in, the lower shielding piece (10), the internal shield ring (13) and it is described outside Shielding ring (14) is integrated punch forming, and the end of a thread (4) of the coil is by the upper shielding piece (11) and the external shield circle (14) gap between passes through, and spacer material layer (18) are arranged at the gap, and the spacer material layer (18) is by the line The end of a thread (4) of circle is isolated with the lower shielding piece (10) and the external shield circle (14), and plastic casing (1) bottom is equipped with flat Platform (15), is provided through installation jack (16) on the platform (15), and the installation jack (16) is interior to be equipped with metal and fix Piece (17), the part that installation jack (16) is stretched out at the both ends of the metal stator (17) are perforated equipped with screw.

2. zero sequence current mutual inductor according to claim 1, which is characterized in that the external shield circle (14) and the wiring The corresponding position in portion (5) is equipped with insulating layer (12).

3. zero sequence current mutual inductor according to claim 2, which is characterized in that the insulating layer (12) and the isolation material The bed of material (18) is insulating tape.