CN105655092A

CN105655092A - Zero sequence current mutual inductor with good looseness prevention performance

Info

Publication number: CN105655092A
Application number: CN201610093471.0A
Authority: CN
Inventors: 胡小青
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-01-15
Filing date: 2016-01-15
Publication date: 2016-06-08

Abstract

The invention discloses a zero sequence current mutual inductor with the good looseness prevention performance. The zero sequence current mutual inductor comprises a pressing ring, a core tube, a core rod, a current transformer and a pressing jaw assembly. The pressing ring is rotationally arranged on the peripheral wall of the core tube. The pressing ring comprises a thorn ring with a plurality of slope grooves. A plurality of wedge-shaped anti-disengagement teeth are arranged in each slope groove. A plurality of radial guiding holes are formed in the tube wall of the core tube. The pressing jaw assembly comprises at least three pressing jaws and a reset spring. Each pressing jaw comprises a pressing plate portion and a radial sliding column. The outer side end of each radial sliding column is provided with wedge-shaped teeth. The pressing plate portion of each pressing jaw is located in a tube cavity of the core tube. Each radial sliding column penetrates through one radial guiding hole. Each wedge-shaped tooth is connected to one corresponding wedge-shaped anti-disengagement tooth in an abutting mode. The core rod is located in the tube cavity of the core tube. The core rod is provided with at least three arc-shaped clamping grooves. Each arc-shaped clamping groove and one corresponding arc-shaped groove are clamped to form a wire clamping hole. The current mutual inductor is provided with an annular base body. The wire clamping holes are located in a hole cavity of the annular base body. The zero sequence current mutual inductor has the good electrical performance.

Description

The zero sequence current mutual inductance device of a kind of anti-loosening better performances

Technical field

The invention belongs to technical field of electric power, it is specifically related to the zero sequence current mutual inductance device of a kind of anti-loosening better performances.

Background technology

The ultimate principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): the algebraic sum flowing into the telegram in reply stream of any node in circuit equals zero. In the normal situation of circuit and electric installation, the vector of each phase current equals zero, and therefore, the secondary side winding no signal of zero sequence current mutual inductance device exports, and power element is failure to actuate. When the vector of each phase current occurring to get an electric shock or during leak current fault is not zero, fault current makes to produce magnetic flux in the iron core of zero sequence current mutual inductance device, and the electric current that zero sequence current mutual inductance device produces is zero sequence electric current. When protection mechanism receives this zero sequence current signal, corresponding protection act can be taked according to electrical leakage quantity.

Mostly the installation mode of existing zero sequence current mutual inductance device is that employing flange is installed fixing or adopts bonding mode to fix, and it installs position it is generally required to reserve, therefore makes its application be subject to more restriction.

Summary of the invention

It is an object of the invention to provide the zero sequence current mutual inductance device of anti-loosening better performances a kind of be convenient to install location, there is better firmly degree, effectively prevent from loosening.

The technical scheme realizing the object of the invention is: the zero sequence current mutual inductance device of a kind of anti-loosening better performances, comprises pressure ring, core pipe, plug, current transformer and paw assembly; Pressure ring rotates and is arranged on core pipe periphery wall; Pressure ring comprises the spine ring that interior perisporium is provided with multiple slopes groove; Each slope groove is provided with the anti-de-tooth of multiple wedge shape; Core tube wall is provided with multiple radially-directed hole; Paw assembly comprises at least three paws and the return spring for each paw offer reseting elasticity; The radial sliding post that each paw comprises pressing plate portion and is arranged on pressing plate portion outer wall; The outboard end of the sliding post of each radial direction is provided with the chisel teeth preventing de-tooth adaptation with the wedge shape in the groove of spine ring slope; The pressing plate portion of each paw is arranged in core pipe pipe chamber, the corresponding radially-directed hole of the radial sliding post of each paw on core tube wall, under the elastic force effect of return spring, on the anti-de-tooth of the wedge shape that the wedge shape tooth top on the sliding post of each radial direction is connected in a corresponding slope groove; Plug is arranged in core pipe pipe chamber; The periphery wall of plug is provided with at least three arc clip slots, and the deep-slotted chip breaker on a corresponding paw inwall is just arranged by each arc clip slot; Each arc clip slot and corresponding deep-slotted chip breaker folder close and form a clamp hole; Current transformer is provided with annular matrix, and each clamp hole is all arranged in the vestibule of annular matrix.

The present invention is owing to having thread clamping mechanism, therefore is easy to install location; In addition the present invention by having wedge shape prevent that each paw is positioned by the slope groove of de-tooth, the technique effect preventing from falling back can be played, compare with by traditional bolt assembly clamping electric power cable, particularly excellent in anti-loosening effect, effectively ensure the reliability of long term operation.

Accompanying drawing explanation

Fig. 1 is a kind of perspective view of the first structure of the present invention;

The one that Fig. 2 is zero sequence current mutual inductance device shown in Fig. 1 partly cuts open structural representation;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is a kind of explosive view of zero sequence current mutual inductance device shown in Fig. 1;

Fig. 5 is a kind of perspective view that zero sequence current mutual inductance device shown in Fig. 1 moves core pipe;

The one that Fig. 6 is the present invention's the 2nd kind of structure partly cuts open structural representation;

Fig. 7 is a kind of perspective view of the core pipe of zero sequence current mutual inductance device shown in Fig. 6;

The one that Fig. 8 is figure the third structure of the present invention partly cuts open structural representation.

Embodiment

(embodiment 1)

The present embodiment is the zero sequence current mutual inductance device of a kind of anti-loosening better performances, sees shown in Fig. 1 to Fig. 5, comprises a pressure ring 1, core pipe, 2, four paw assemblies, 3, axial back-up ring, 4, plug 7 and a current transformer 8.

Pressure ring 1 comprises spine ring 11, two folders of separation spine ring both sides connect ring 12 and multiple connecting rivet 13, two folders connect ring clamping spine ring, connecting rivet axially runs through described spine ring along core pipe and two folders connect ring, thus spine ring and two folders is connect ring and is fixedly connected into an entirety. The interior perisporium of spine ring is provided with multiple slopes groove 111, is provided with the anti-de-tooth 112 of multiple wedge shape in the groove of each slope; In the present embodiment, the interior perisporium that the interior perisporium of spine ring and folder connect ring is coplanar, and the periphery wall that the periphery wall of spine ring and folder connect ring is coplanar; The periphery wall of pressure ring is provided with multiple binding groove 14 axially running through whole pressure ring along core pipe, and the operation of twisting of pressure ring adopts hook type spanner (be commonly called as and hook head spanner). In concrete practice, press from both sides the interior perisporium that the internal diameter connecing ring also can be slightly smaller than spine ring. Slope groove in the present embodiment refers to the groove that the groove degree of depth increases progressively gradually from one end to the other end.

The periphery wall of core pipe 2 is provided with the annular recesses 22 of outer convex annular gear platform 21 and indent, and core pipe is provided with multiple radially-directed hole 23 on the tube wall kept off in annular between platform and annular recesses; In the present embodiment, each radially-directed hole is along core caliber to running through core tube wall, each radially-directed hole comprises accommodating hole 231 and the sliding hole 232 of guiding of connection, accommodating hole and the sliding hole of guiding are arranged successively along direction from outside to inside, accommodating hole and the sliding Kong Jun of guiding are circular holes, the aperture of accommodating hole is greater than the aperture in the sliding hole of guiding, and the cross-sectional shape in each radially-directed hole is T-shaped. Axial back-up ring is arranged in the annular recesses of core pipe. Pressure ring rotates and is arranged on core pipe periphery wall, and the two side ends of pressure ring keeps off platform with annular respectively and axial back-up ring slides adjacent.

The mat 33 that paw assembly 3 comprises multiple paw 31, provides the return spring 32 of reseting elasticity for paw and be fixedly installed on each paw; The radial annular slot 313 slided post 312, be arranged on radial sliding post periphery wall that each paw comprises pressing plate portion 311, is arranged on pressing plate portion outer wall; Each radial direction is slided the guiding in post and radially-directed hole and is slided hole adaptation, and the sliding post of each radial direction is leading under the position-limiting action sliding hole along core caliber to reciprocal slip; The outboard end of the sliding post of each radial direction is provided with chisel teeth 34; The anti-de-tooth of wedge shape in each chisel teeth and spine ring slope groove is adaptive. Each mat is fixed in the annular slot of a corresponding radial sliding post, each return spring is set on a corresponding radial sliding post, each return spring is connected in a corresponding annular mat along core caliber outer end upwards, and return spring is connected on the diapire of accommodating hole along core caliber the inner upwards;

The pressing plate portion of each paw is arranged in core pipe pipe chamber, the corresponding radially-directed hole of the radial sliding post of each paw on core tube wall, under the elastic force effect of return spring, on the anti-de-tooth of the wedge shape that the wedge shape tooth top on the sliding post of each radial direction is connected in a corresponding slope groove of spine ring. Under the position-limiting action of slope groove and chisel teeth, the pressure ring in the present embodiment can only be twisted along a direction, has the technique effect that anti-retrogression is also namely anti-loosening.

The inwall in each paw pressing plate portion is provided with deep-slotted chip breaker 314.

Plug 7 is arranged in core pipe pipe chamber; The periphery wall of plug is provided with multiple arc clip slot 71, and each arc clip slot axially extends along core pipe, and the deep-slotted chip breaker on a corresponding paw inwall is just arranged by each arc clip slot; Each arc clip slot and corresponding deep-slotted chip breaker folder close and form a clamp hole 5; So the present embodiment can form four clamp holes, can be used for clamping four cables simultaneously.

The periphery wall of plug is provided with the convex plate 72 of four supporting and locations protruded along core pipe radial direction, the interior perisporium of core pipe is provided with four positioning runners 24, the outboard end of the convex plate of each supporting and location is embedded in a corresponding positioning runner, thus plug is positioned in the pipe chamber of the sliding pipe of matrix.

Current transformer comprises annular matrix 81 and intelligent control module 82; Annular matrix is fixedly installed on a folder and connects on ring; In the present embodiment, folder connects ring at the side end of adjacent spine ring and is provided with installation gap 121, and annular matrix is inlaid in this installation gap.

The present embodiment forms four clamp holes altogether, it may also be useful to time, wherein three clamp holes respectively clamp a phase line cable, and another one folder hole is as subsequent use. Owing to three electric power cables pass from the sliding pipe pipe chamber of matrix, three electric power cables can be carried out zero sequence current detecting by induction mode by this current transformer, for Timeliness coverage leakage current fault, and send real-time information to long-range main frame by wireless transmit/receive units, for electric power circuit intellectuality provides basic data.

The present embodiment is when operating, hook type spanner is adopted to twist pressure ring, pressure ring is made to drive the anti-de-tooth of the wedge shape in its slope groove to rotate, owing to each return spring can be out of shape shortening by power, the chisel teeth of the sliding post of each pressing plate radial direction is moved towards the side that groove depth in the groove of slope is more shallow, and then make the pressing plate portion of each paw along the radially-inwardly slippage of core pipe, thus clamping is arranged in the electric power cable in clamp hole.

In addition, the present embodiment by having wedge shape prevent that each paw is positioned by the slope groove of de-tooth, it is possible to play the technique effect preventing from falling back, with by traditional bolt assembly clamp electric power cable compare, in anti-loosening effect particularly excellent, effectively ensure the reliability of long term operation.

(embodiment 2)

The present embodiment is substantially identical with embodiment 1, and difference is: see shown in Fig. 6 and Fig. 7, and in addition, the periphery wall of core pipe is provided with settles groove 25, and intelligent control module is arranged on to be settled in groove; Intelligent control module can comprise wireless transmit/receive units; This kind of structure can make full use of space, is conducive to the small-sized and integrated of entirety.

(embodiment 3)

The present embodiment is substantially identical with embodiment 1, difference is: as shown in Figure 8, the present embodiment is no longer arranged on folder the annular matrix of voltage transformer and connects in ring, in the present embodiment, the annular matrix of voltage transformer is fixedly installed on core pipe periphery wall, this kind of scheme is also feasible, and structure is compacter and is easy to manufacture processing; As long as allowing in a word by folder electric power cable through annular matrix.

Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention. For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description. Here without the need to also cannot all enforcement modes be given exhaustive. And the apparent change that these connotations belonging to the present invention are extended out or variation still belong to protection scope of the present invention.

Claims

1. the zero sequence current mutual inductance device of an anti-loosening better performances, it is characterised in that: comprise pressure ring, core pipe, plug, current transformer and paw assembly; Pressure ring rotates and is arranged on core pipe periphery wall; Pressure ring comprises the spine ring that interior perisporium is provided with multiple slopes groove; Each slope groove is provided with the anti-de-tooth of multiple wedge shape; Core tube wall is provided with multiple radially-directed hole; Paw assembly comprises at least three paws and the return spring for each paw offer reseting elasticity; The radial sliding post that each paw comprises pressing plate portion and is arranged on pressing plate portion outer wall; The outboard end of the sliding post of each radial direction is provided with the chisel teeth preventing de-tooth adaptation with the wedge shape in the groove of spine ring slope; The pressing plate portion of each paw is arranged in core pipe pipe chamber, the corresponding radially-directed hole of the radial sliding post of each paw on core tube wall, under the elastic force effect of return spring, on the anti-de-tooth of the wedge shape that the wedge shape tooth top on the sliding post of each radial direction is connected in a corresponding slope groove; Plug is arranged in core pipe pipe chamber; The periphery wall of plug is provided with at least three arc clip slots, and the deep-slotted chip breaker on a corresponding paw inwall is just arranged by each arc clip slot; Each arc clip slot and corresponding deep-slotted chip breaker folder close and form a clamp hole; Current transformer is provided with annular matrix, and each clamp hole is all arranged in the vestibule of annular matrix.