CN109167286B - Live replacement device for current transformer of power distribution network - Google Patents
Live replacement device for current transformer of power distribution network Download PDFInfo
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- CN109167286B CN109167286B CN201810873762.0A CN201810873762A CN109167286B CN 109167286 B CN109167286 B CN 109167286B CN 201810873762 A CN201810873762 A CN 201810873762A CN 109167286 B CN109167286 B CN 109167286B
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- linkage mechanism
- spring contact
- current transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
Abstract
The invention provides a live replacement device for a current transformer of a power distribution network, which comprises: the bus bar side linkage mechanism and the mutual inductor side linkage mechanism are arranged on two sides of the rotary linkage mechanism, the bus bar side linkage mechanism is connected with a primary current bus bar, and the mutual inductor side linkage mechanism is connected with a current mutual inductor; the rotary linkage mechanism rotates around the central axis to control the current transformer to be connected to or disconnected from the primary system; the busbar side linkage mechanism and the mutual inductor side linkage mechanism are connected with the support, and the support is further used for placing a current mutual inductor. Through the cooperation of each link gear of the electrified replacing device, the current transformer is connected and disconnected under the condition of no power failure, and the current transformer is replaced. Therefore, economic loss caused by power failure to users is avoided, the operation flow of replacing the current transformer in operation is greatly reduced, and the power supply quality is improved.
Description
Technical Field
The invention relates to the technical field of electric energy metering devices, in particular to a live replacement device for a current transformer of a power distribution network.
Background
Currently, the electric energy metering devices in the distribution network account for approximately 90% of the total electric energy metering devices. The metering accuracy of the electric energy metering device directly influences the fairness of electric energy trade settlement of the power distribution network and the economic benefits of both power supply and power utilization parties. According to the national verification regulations, the electric energy metering device should carry out error detection and calibration regularly, and the mutual inductor with the error exceeding the standard regulation should be replaced. At present, the current transformer of the power distribution network can only be replaced by a mode of power cut according to a plan, the power cut operation application flow is complex, the period is long, and the field safety measures are complex, so that the normal production plan of a user and the economic benefit of a power supply company are greatly influenced.
Distribution network current transformer installs in the measurement cabinet, and insulating distance is short, the place space is narrow and small, and the shared space of current electrified change device is great, and the structure is complicated, does not possess the demand of field application. When the current transformer is replaced in a charged mode, the operation is complex, the number of steps is large, and equipment accidents and personal safety accidents are easy to happen. And the time period for replacing the current transformer in a charged state is longer, and the advantages are not obvious compared with the replacement in a power failure state.
Disclosure of Invention
In view of the above, the invention provides a live replacement device for a current transformer of a power distribution network, and aims to solve the problem of rapidly replacing the current transformer in a live manner.
In one aspect, the present invention provides an apparatus for replacing a current transformer in a power distribution network with electricity, including: the bus bar side linkage mechanism and the mutual inductor side linkage mechanism are arranged on two sides of the rotary linkage mechanism, the bus bar side linkage mechanism is connected with a primary current bus bar, and the mutual inductor side linkage mechanism is connected with a current mutual inductor; the rotary linkage mechanism rotates around the central axis to control the current transformer to be connected to or disconnected from a primary system; female side link gear and mutual-inductor side link gear with the leg joint, the support still is used for placing current transformer.
Further, female side link gear, rotary link gear and mutual-inductor side link gear center run through a cylinder type connecting strut, rotary link gear winds connecting strut lateral wall rotates, the connecting strut axis with female side link gear, rotary link gear and mutual-inductor side link gear axis coincidence.
Furthermore, the rotary linkage mechanism comprises a cylindrical hollow second box body, two short-circuit conducting rods which are inserted into the second box body and arranged in parallel relatively, and two connecting conducting rods which are arranged in parallel relatively and penetrate through the second box body, and the connecting support columns penetrate through two bottom surfaces of the second box body; the short-circuit conducting rods, the connecting conducting rods and the connecting support are arranged in the same direction and are alternately and uniformly arranged along the circumferential direction of the connecting support; and the two short-circuit conducting rods are arranged at the short circuit of the end part in the second box body.
Furthermore, the busbar side linkage mechanism comprises a cylindrical hollow first box body, a plurality of first springs arranged in the first box body and two arc-shaped first spring contact plates arranged in the first box body, wherein one end of the connecting strut penetrates through the bottom surface of one side of the first box body opposite to the second box body and is inserted into the first box body; one end of each first spring is connected with the inner side wall of the first box body, the other end of each first spring is connected with the outer side wall of the connecting strut, and the first springs are uniformly arranged along the circumferential direction of the connecting strut; the two first spring contact pieces are oppositely arranged and fixedly connected with the first springs into a whole, and the first spring contact pieces are simultaneously or respectively contacted with the short-circuit conducting rod and the end part of the connecting conducting rod.
Furthermore, a first groove is formed in the middle of the first spring contact piece, and the first groove is used for enabling the end part of the short-circuit conducting rod or the connecting conducting rod to be inserted into the first groove.
Furthermore, the central angle of the arc length of the first spring contact piece is 120 degrees, and the central symmetry axis of the first spring contact piece forms an included angle of 60 degrees with the horizontal plane; the two first spring contact pieces are respectively connected with the input end and the output end of the primary current busbar.
Furthermore, the mutual inductor side linkage mechanism comprises a cylindrical hollow third box body, a plurality of second springs arranged in the third box body and two arc-shaped second spring contact plates arranged in the third box body, wherein one end of the connecting strut penetrates through the bottom surface of one side of the third box body opposite to the second box body and is inserted in the third box body; one end of each second spring is connected with the inner side wall of the third box body, the other end of each second spring is connected with the outer side wall of the connecting strut, and the second springs are uniformly arranged along the circumferential direction of the connecting strut; the two second spring contact pieces are oppositely arranged and are fixedly connected with the second springs into a whole, and the second spring contact pieces are contacted with the end parts of the connecting conductive rods.
Furthermore, two second grooves are formed in the second spring contact piece, the two second grooves are uniformly formed in two sides of the symmetry axis of the second spring contact piece, the central angle formed by the arc length between the two second grooves is 90 degrees, and the second grooves are used for enabling the end parts of the connecting conducting rods to be inserted into the second grooves.
Further, the first spring contact piece and the second spring contact piece are arranged oppositely, and the curvature radius and the length of the first spring contact piece and the second spring contact piece are the same.
Furthermore, the short-circuit conducting rod and the connecting conducting rod are positioned on the edge of the same circle, the circle takes the circle center of the connecting strut as the circle center, and the first spring contact piece and the second spring contact piece are superposed with the edge of the circle; the lengths of the first spring contact piece and the second spring contact piece are larger than the lengths of the adjacent arcs between the short-circuit conducting rod and the connecting conducting rod, and are smaller than the lengths of the arcs between the two short-circuit conducting rods or the two connecting conducting rods.
Furthermore, the central angle of the arc length of the second spring contact piece is 120 degrees, and the central symmetry axis of the second spring contact piece forms an included angle of 90 degrees with the horizontal plane; the second spring contact piece is connected with the current transformer.
Furthermore, a first bulge is arranged on the outer side wall of the first box body, a second bulge is arranged on the outer side wall of the third box body, and the first bulge and the second bulge are oppositely arranged; the first box body and the third box body are connected with the bracket through the first bulge and the second bulge.
Further, the first box body, the second box body, the third box body and the connecting support columns are made of insulating materials.
Further, the connecting struts are made of polytetrafluoroethylene.
Furthermore, a handle is arranged on the outer side wall of the second box body and used for driving the second box body to rotate.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the live replacement device is connected between the current transformer and the primary terminal, and the current transformer is connected and disconnected under the condition of no power failure through the cooperation of each linkage mechanism of the live replacement device, namely the current transformer is replaced. Therefore, economic loss caused by power failure to users is avoided, the operation flow of replacing the current transformer in operation is greatly reduced, and the power supply quality is further improved.
Furthermore, compared with the existing device for replacing the current transformer, the device for replacing the current transformer with electricity does not need to carry out complicated operation when the current transformer is replaced with electricity by adopting the electricity replacing device, the device only needs to rotate the rotary linkage mechanism when the current transformer is withdrawn, and the rotary linkage mechanism is rotated in the opposite direction again after the current transformer is connected, so that the replacing operation of the current transformer can be completed, and the replacing efficiency of the current transformer is greatly improved.
Furthermore, before the current transformer is connected in and withdrawn in an electrified mode, the short-circuit conducting rod in the rotary linkage mechanism can be used for short-circuit the current transformer in advance, so that the impact of instantaneous current on the current transformer when the current transformer is connected in and withdrawn from is avoided, and the safety performance is improved.
Furthermore, the invention adopts a pure mechanical structure, and has the advantages of stable structure, convenient operation and convenient production and application.
Furthermore, the live replacement device disclosed by the invention adopts a cylindrical linkage mechanism, and has the advantages of compact structure, smaller volume and stronger practicability.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram illustrating an overall structure of a live exchange device according to an embodiment of the present invention;
fig. 2 is an internal structural view of a charging device according to an embodiment of the present invention;
fig. 3 is a sectional view of a busbar-side linkage mechanism according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a transformer side linkage provided by an embodiment of the present invention;
fig. 5 is a schematic cross-sectional working view of a busbar-side linkage mechanism according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the present embodiment provides a distribution network current transformer live replacement device structure, including a support 9, a busbar side link mechanism 2, a rotary link mechanism 3, and a transformer side link mechanism 4, where the support 9 is fixed on a side wall of a metering cabinet to fix and support the busbar side link mechanism 2, the rotary link mechanism 3, and the transformer side link mechanism 4, and support a current transformer 6. The busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4 are located on the same central axis and are connected side by side, and preferably, the size and the shape of the busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4 are the same. The busbar side linkage mechanism 2 and the mutual inductor side linkage mechanism 4 are arranged on two sides of the rotary linkage mechanism 3, and the bottom surfaces of the busbar side linkage mechanism and the mutual inductor side linkage mechanism are respectively connected. The busbar side linkage mechanism 2 is connected with the primary current busbar 1, and the transformer side linkage mechanism 4 is connected with the current transformer 6; the rotary linkage mechanism 3 rotates around the central axis thereof, the central axis thereof is the same as the central axes of the busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4, and the internal circuits of the busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4 are short-circuited by rotating the rotary linkage mechanism 3, so that the current mutual inductor 6 is controlled to be connected into or withdrawn from a primary system to replace the current mutual inductor 6.
It can be understood that the live replacing device is connected between the mutual inductor and the primary terminal, and the current mutual inductor can be connected and disconnected under the condition of once power outage through the linkage mechanism of the live replacing device. The economic loss brought to the user by power failure is avoided, the operation flow of a power supply company for replacing the current transformer in operation is greatly reduced, and the method has important significance for further improving the power supply quality.
Specifically, the busbar side link mechanism 2 and the transformer side link mechanism 4 are connected with a support 9, and the support 9 is also used for placing the current transformer 6. A slide rail may be further provided on the bracket 6, and the current transformer 6 is provided on the slide rail, so that the transformer can be moved.
Specifically, the primary current busbar 1 is connected with a primary current copper bar of the metering cabinet.
Specifically, the center of the busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4 penetrates through a cylindrical connecting support column 10, the rotary linkage mechanism 3 rotates around the outer side wall of the connecting support column 10, and the central axis of the connecting support column 10 coincides with the central axes of the busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4.
Referring to fig. 2, specifically, the rotary linkage mechanism 3 includes a second cylindrical hollow box, two short-circuit conductive rods 32 inserted into the second cylindrical hollow box and arranged in parallel, and two connecting conductive rods 31 arranged in parallel and penetrating the second cylindrical hollow box. The connecting support columns 10 penetrate through the two bottom surfaces of the second box body, two through holes are formed in the center positions of the two bottom surfaces of the second box body oppositely, so that the connecting support columns 10 can pass through the through holes, the central axes of the through holes coincide with the central axes of the connecting support columns 10, and the central axes of the through holes coincide with the central axes of the second box body. The two bottom surfaces of the second box body can support and fix the connecting strut 10, and the second box body rotates around the connecting strut 10.
Specifically, the short-circuit conducting rods 32 and the connecting conducting rods 31 are arranged in the same direction as the connecting support column 10 and are alternately arranged along the circumferential direction of the connecting support column 10, that is, a circle is drawn at the center of the connecting support column 10, the short-circuit conducting rods 32 and the connecting conducting rods 31 are alternately arranged on the edge of the circle, the short-circuit conducting rods 32, the connecting conducting rods 31 and the connecting support column 10 are relatively arranged in parallel, that is, a cross line is drawn with the center of the connecting support column 10 as the middle point, the two short-circuit conducting rods 32 and the two connecting conducting rods 31 are respectively arranged on a straight line of the cross line, and the short-circuit conducting rods 32 and the connecting conducting rods 31 are adjacent to each other and form an included angle of 90 degrees.
Specifically, the two short-circuit conducting rods 32 are short-circuited at the end portion disposed in the second box body, that is, the end portions of the two short-circuit conducting rods 32 are disposed in the second box body and are short-circuited.
It can be understood that before the current transformer is connected in and withdrawn in a charged mode, the short-circuit conducting rod in the rotary linkage mechanism can be used for short-circuit the current transformer in advance, so that the impact of instantaneous current on the current transformer when the current transformer is connected in and withdrawn from the current transformer is avoided, and the safety performance is improved.
It is shown in combination with fig. 2 and fig. 3 particularly that female side link gear 2 includes that cylinder type hollow first box body, setting are in a plurality of first springs 22, the setting in the first box body are in the first spring contact 21 of two arcs in the first box body, the one end of connecting strut 10 pass first box body with the bottom surface of one side that the second box body is relative, insert and establish in first box body, seted up a through-hole on the bottom surface of first box body, a tip of connecting strut 10 passes the through-hole and inserts and establish first box body, through the bottom surface of first box body in order to make and fixed connection strut 10, the through-hole of first box body, first box body and the coincidence of the axis that connects strut 10.
Specifically, one end of the first spring 22 is connected to the inner sidewall of the first box body, and is fixed by welding or bolting, and the other end is connected to the outer sidewall of the connecting strut 10, and is fixed by welding or bolting, and each first spring 22 is arranged along the circumferential direction of the connecting strut uniformly, and the distance between each first spring 22 is the same, and each first spring 22 is arranged perpendicular to the connecting strut 10, and the inner sidewall of the first box body is arranged perpendicular to the inner sidewall.
Specifically, the two first spring contact pieces 21 are arranged oppositely, the two first spring contact pieces 21 are arranged symmetrically, and are connected and fixed with the first spring 22 into a whole, and the first spring contact pieces 21 and the first spring 22 are fixed into a whole by welding or bolts. The first spring contact 21 can be in contact with the end of the shorting pin 32 and the connecting pin 31 simultaneously or in contact with the end of the shorting pin 32 or the connecting pin 31, respectively. The number of the first springs 22 is preferably 4 or 6, and the number is not particularly limited, and it is only necessary to fix the first spring contact piece 21.
Specifically, the middle part of the first spring contact piece 21 is provided with a first groove 23, the first groove 23 is used for enabling the end part of the short-circuit conducting rod 32 or the connecting conducting rod 31 to be inserted therein, when the short-circuit conducting rod 32 or the connecting conducting rod 31 is in contact with the first spring contact piece 21, the short-circuit conducting rod 32 or the connecting conducting rod 31 is fixed and positioned, and when the rotary linkage mechanism 3 is placed, the rotary linkage mechanism 3 slides.
Specifically, the first spring contact piece 21 is connected to the input end and the output end of the primary current busbar 1, respectively.
As shown in fig. 2 and 4, specifically, mutual-inductor side link gear 4 includes that cylinder type hollow third box body, setting are in a plurality of second springs 42, the setting in the third box body are in two arc second spring contact 41 in the third box body, the one end of connecting strut 10 is passed the third box body with the bottom surface of one side that the second box body is relative, insert and establish in the third box body, a through-hole is seted up at the bottom surface middle part of third box body, and the tip of connecting strut 10 passes the through-hole is inserted and is established in the third box body, through the bottom surface of third box body with support and fixed connection pillar 10, the axis coincidence of connecting strut 10, third box body and through-hole.
Specifically, one end of each second spring 42 is connected to the inner side wall of the third box body and fixed by welding or bolting, and the other end is connected to the outer side wall of the connecting strut 10 and fixed by welding or bolting, the second springs 42 are uniformly arranged along the circumferential direction of the connecting strut 10, and the intervals between the second springs 42 are the same; each of the second springs 42 is vertically disposed with an outer sidewall of the connection pillar 10 and an inner sidewall of the third container, respectively.
Specifically, the two second spring contact pieces 41 are disposed opposite to each other, that is, the two second spring contact pieces 41 are symmetrically disposed and connected and fixed to the second spring 42, and the second spring contact pieces 41 are in contact with the end of the connecting conductive rod 31.
It can be understood that compared with the existing device for replacing the current transformer, the device for replacing the current transformer with electricity in the invention does not need to carry out complicated operation when the current transformer is replaced with electricity by adopting the device for replacing the current transformer with electricity in the invention, the device only needs to rotate the rotary linkage mechanism when the current transformer is withdrawn, and the rotary linkage mechanism is rotated to the opposite direction again after the current transformer is connected, so that the replacement operation of the current transformer can be completed, and the replacement efficiency of the current transformer is greatly improved.
Specifically, the second spring contact piece 41 is provided with two second grooves 43, the two second grooves are uniformly arranged on two sides of the symmetry axis of the second spring contact piece 41, the central angle subtended by the arc length between the two second grooves is 90 °, that is, the included angle between the two second grooves 43 is 90 ° and the second grooves 43 are used for enabling the end portion of the connecting conducting rod 31 to be inserted therein, so as to fix and position the connecting conducting rod 31.
In particular, the first spring contact 21 and the second spring contact 41 are arranged opposite to each other, i.e. symmetrically, and can be in contact with or not in contact with the connecting rod 31 at the same time. The first spring contact piece 21 and the second spring contact piece 41 have the same radius of curvature and length.
Specifically, the shorting conductor bar 32 and the connecting conductor bar 31 are located on the edge of the same circle, the circle is centered on the center of the connecting strut 10, and the first spring contact piece 21 and the second spring contact piece 41 are overlapped with the edge of the circle.
Specifically, the lengths of the first spring contact piece 21 and the second spring contact piece 41 are greater than the minimum arc length between the adjacent short-circuit conducting rod 32 and the connecting conducting rod 31, and less than the arc length between two short-circuit conducting rods 32 or two connecting conducting rods 31.
Specifically, the second spring contact 41 is connected to the current transformer 6.
Specifically, a first bulge 7 is arranged on the outer side wall of the first box body, a second bulge 8 is arranged on the outer side wall of the third box body, and the first bulge 7 and the second bulge 8 are arranged oppositely; the first box body and the third box body are connected with the bracket 9 through the first bulge 7 and the second bulge 8.
It can be understood that the invention adopts a pure mechanical structure, and has the advantages of stable structure, convenient operation and convenient production and application. Furthermore, the live replacement device disclosed by the invention adopts a cylindrical linkage mechanism, and has the advantages of compact structure, smaller volume and stronger practicability.
Specifically, the first container, the second container, the third container, and the connection strut 10 are made of an insulating material. In particular, the connecting strut 10 is made of polytetrafluoroethylene.
Specifically, a handle 33 is disposed on an outer side wall of the second box, and the handle 33 is used for driving the second box to rotate.
Specifically, the busbar side link mechanism 2, the rotary link mechanism 3 and the transformer side link mechanism 4 are penetrated through by a polytetrafluoroethylene pillar so as to connect the busbar side link mechanism 2, the rotary link mechanism 3 and the transformer side link mechanism 4 into a whole. The bottom surfaces of the busbar side linkage mechanism 2 and the mutual inductor side linkage mechanism 4 are fixedly connected with the polytetrafluoroethylene support. Six springs are fixedly arranged on the outer side walls of the polytetrafluoroethylene pillars in the busbar side linkage mechanism 2 and the mutual inductor side linkage mechanism 4 along the circumferential direction of the springs, and metal contact pieces are fixed on the springs.
Specifically, the busbar side linkage mechanism 2 and the mutual inductor side linkage mechanism 4 are respectively poured through polytetrafluoroethylene, the metal contact pieces are arc-shaped contact pieces, the metal contact pieces are arranged in parallel with the bottom surfaces of the busbar side linkage mechanism 2 and the mutual inductor side linkage mechanism 4, the central axes of the polytetrafluoroethylene support columns are symmetrically arranged, and the metal contact pieces have the same curvature radius; the middle part of the metal contact piece is provided with a groove; the metal contact inside the busbar side linkage mechanism 2 penetrates through the bottom surface of the busbar side linkage mechanism to be connected with a primary output current busbar 1; and a metal contact in the mutual inductor side linkage mechanism 2 penetrates through the bottom surface of the mutual inductor side linkage mechanism to be connected with the primary output end of the mutual inductor.
Specifically, a metal conducting rod penetrating through the bottom surfaces of the busbar side linkage mechanism 2, the rotary linkage mechanism 3 and the mutual inductor side linkage mechanism 4 is arranged in the live replacement device, another two metal conducting rods are additionally arranged between the busbar side linkage mechanism 2 and the rotary linkage mechanism 3, and the two additionally arranged metal conducting rods are connected in series and in short circuit in the rotary live replacement device.
Specifically, in order to ensure good contact between the spring contact and the metal conducting rod in the rotary linkage mechanism 3, springs with large elastic coefficients are adopted in the busbar side linkage mechanism 2 and the transformer side linkage mechanism 4.
Specifically, the diameters of grooves in spring contact pieces inside the busbar side link mechanism 2 and the mutual inductor side link mechanism 4 are slightly smaller than the diameter of the metal conducting rod, and under the contact pressure provided by the spring, the spring contact pieces are in good contact with the metal conducting rod and play a role in fixing the metal conducting rod when the metal conducting rod is in a static state.
Specifically, the central angle subtended by the arc length of the first spring contact piece 21 in the busbar side linkage mechanism 2 is 120 degrees, and the central symmetry axis of the first spring contact piece 21 forms an included angle of 60 degrees with the horizontal plane; the central angle of the arc length of the second spring contact piece 41 in the mutual inductor side linkage mechanism 4 is also 120 degrees, and the central symmetry axis of the second spring contact piece 41 forms an included angle of 90 degrees with the horizontal plane.
As shown in fig. 1 and 5, in a normal connection working state of the current transformer 6, the connection conducting rod 31 is connected to the primary current busbar 1 through the first spring contact 21, the other end of the connection conducting rod is connected to the current transformer 6 through the connection line 5, and the short-circuit conducting rod 32 and the first spring contact 21 are in a disconnected state, so that the current transformer 6 can be normally connected to a primary system. The specific live exit process is as follows:
step a, pulling a handle 33 of the rotary linkage mechanism 3 to enable a connecting conducting rod 31 and a short-circuit conducting rod 32 on the rotary linkage mechanism 3 to rotate along the connecting strut 10, wherein the connecting conducting rod 31 is not separated from the first spring contact piece 21 at the moment, and the current transformer is connected into a primary system according to 6;
step b, continuing to rotate the rotary linkage mechanism 3 in the same direction, and still connecting the current transformer 6 to a primary system when the short-circuit conducting rod 32 is not connected to the first spring contact piece 21;
and c, when the short-circuit conducting rod 32 is connected into the first spring contact piece 21, the connecting conducting rod 31 does not exit from the first spring contact piece 21. Since the short-circuit conducting rod 32 is short-circuited inside the rotary linkage mechanism 3, the current transformer 6 is short-circuited, but the primary system is not disconnected;
and d, when the connecting conducting rod 31 is separated from the first spring contact piece 21, the current transformer 6 is completely separated from the system. At this time, the current transformer 6 can be taken down from the bracket, and the live exit of the transformer is completed.
When the live wire is withdrawn, the connecting conductive rod 31 is always positioned between the second spring contact pieces 41 at the transformer-side linkage 4 side portion. In the whole live-line exit process, the action amplitude of the rotary linkage mechanism 3 is small (rotating by 90 degrees), the current transformer 6 is short-circuited firstly and then separated from a primary system, the current conduction of the primary system can be maintained on the premise of considering safety, and the live-line exit of the current transformer 6 is realized. When live-line connection is carried out, after the current transformer is connected into the transformer side linkage mechanism 4, the rotating linkage mechanism 3 is rotated in the opposite direction, and the current transformer 6 is still connected into a primary system when the short-circuit conducting rod 32 is not connected into the first spring contact piece 21.
In the above embodiment, the positions of the grooves on the first spring contact piece 21 and the second spring contact piece 41 are designed to be the same as the positions of the connecting conductive rod 31 or the short-circuit conductive rod 32 in the static working state in the live replacement process, so that the connecting conductive rod 31 or the short-circuit conductive rod 32 can have a sufficient contact area when being connected to a primary electrical system. And the design of the groove ensures that the connecting conducting rod 31 and/or the short-circuit conducting rod 32 can not shift in the working state, thereby ensuring the safety performance of the live replacement device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. The utility model provides a distribution network current transformer is electrified to be changed device which characterized in that includes: a bracket, and a busbar side linkage mechanism, a rotary linkage mechanism and a mutual inductor side linkage mechanism which are positioned on the same central axis and connected with each other,
the busbar side linkage mechanism and the mutual inductor side linkage mechanism are arranged on two sides of the rotary linkage mechanism, the busbar side linkage mechanism is connected with a primary current busbar, and the mutual inductor side linkage mechanism is connected with a current mutual inductor; the rotary linkage mechanism rotates around the central axis to control the current transformer to be connected to or disconnected from a primary system;
the busbar side linkage mechanism and the mutual inductor side linkage mechanism are connected with the bracket, and the bracket is also used for placing the current mutual inductor;
the center of the busbar side linkage mechanism, the rotary linkage mechanism and the mutual inductor side linkage mechanism penetrates through a cylindrical connecting support, the rotary linkage mechanism rotates around the outer side wall of the connecting support, and the central axis of the connecting support is superposed with the central axes of the busbar side linkage mechanism, the rotary linkage mechanism and the mutual inductor side linkage mechanism;
the rotary linkage mechanism comprises a cylindrical hollow second box body, two short-circuit conducting rods which are inserted into the second box body and arranged in parallel relatively, and two connecting conducting rods which are arranged in parallel relatively and penetrate through the second box body, and the connecting support columns penetrate through two bottom surfaces of the second box body;
the short-circuit conducting rods, the connecting conducting rods and the connecting support are arranged in the same direction and are alternately and uniformly arranged along the circumferential direction of the connecting support;
the two short-circuit conducting rods are arranged in the second box body and are in short circuit at the end parts;
the bus bar side linkage mechanism comprises a cylindrical hollow first box body, a plurality of first springs arranged in the first box body and two arc-shaped first spring contact plates arranged in the first box body, wherein one end of the connecting strut penetrates through the bottom surface of one side of the first box body opposite to the second box body and is inserted into the first box body;
one end of each first spring is connected with the inner side wall of the first box body, the other end of each first spring is connected with the outer side wall of the connecting strut, and the first springs are uniformly arranged along the circumferential direction of the connecting strut;
the two first spring contact pieces are oppositely arranged and are fixedly connected with the first springs into a whole, and the first spring contact pieces are simultaneously or respectively contacted with the short-circuit conducting rod and the end part of the connecting conducting rod;
the mutual inductor side linkage mechanism comprises a cylindrical hollow third box body, a plurality of second springs arranged in the third box body and two arc-shaped second spring contact plates arranged in the third box body, wherein one end of the connecting strut penetrates through the bottom surface of one side of the third box body, which is opposite to the second box body, and is inserted in the third box body;
one end of each second spring is connected with the inner side wall of the third box body, the other end of each second spring is connected with the outer side wall of the connecting strut, and the second springs are uniformly arranged along the circumferential direction of the connecting strut;
the two second spring contact pieces are oppositely arranged and are fixedly connected with the second springs into a whole, and the second spring contact pieces are contacted with the end parts of the connecting conductive rods.
2. The live replacement device for the current transformer of the power distribution network according to claim 1, wherein a first groove is formed in the middle of the first spring contact piece, and the first groove is used for inserting the end part of the short-circuit conducting rod or the connecting conducting rod into the first groove.
3. The live replacement device for distribution network current transformers according to claim 1,
the central angle of the arc length of the first spring contact piece is 120 degrees, and the central symmetry axis of the first spring contact piece forms an included angle of 60 degrees with the horizontal plane;
the two first spring contact pieces are respectively connected with the input end and the output end of the primary current busbar.
4. The live replacement device for the current transformer of the power distribution network according to claim 1, wherein the second spring contact is provided with two second grooves, the two second grooves are uniformly arranged on two sides of a symmetry axis of the second spring contact, a central angle subtended by an arc length between the two second grooves is 90 degrees, and the second grooves are used for enabling the end portions of the connecting conducting rods to be inserted into the second grooves.
5. The live exchange device for the distribution network current transformer according to claim 1, wherein the first spring contact piece and the second spring contact piece are oppositely arranged, and the curvature radius and the length of the first spring contact piece and the second spring contact piece are the same.
6. The live replacement device for the current transformer of the power distribution network of claim 5, wherein the short-circuit conducting rod and the connecting conducting rod are located on the edge of the same circle, the circle is centered at the center of the connecting strut, and the first spring contact piece and the second spring contact piece are overlapped with the edge of the circle;
the lengths of the first spring contact piece and the second spring contact piece are larger than the lengths of the adjacent arcs between the short-circuit conducting rod and the connecting conducting rod, and are smaller than the lengths of the arcs between the two short-circuit conducting rods or the two connecting conducting rods.
7. The live replacement device for distribution network current transformers according to claim 1,
the central angle of the arc length of the second spring contact piece is 120 degrees, and the central symmetry axis of the second spring contact piece forms an included angle of 90 degrees with the horizontal plane;
the second spring contact piece is connected with the current transformer.
8. The live replacement device for the current transformer of the power distribution network according to claim 1, wherein a first protrusion is arranged on the outer side wall of the first box body, a second protrusion is arranged on the outer side wall of the third box body, and the first protrusion and the second protrusion are arranged oppositely;
the first box body and the third box body are connected with the bracket through the first bulge and the second bulge.
9. The live replacement device for the current transformer of the power distribution network according to any one of claims 1 to 8, wherein the first box body, the second box body, the third box body and the connecting support are made of insulating materials.
10. The live replacement device for a current transformer in a power distribution network according to any one of claims 1 to 8, wherein the connecting strut is made of polytetrafluoroethylene.
11. The live replacement device for the current transformer of the power distribution network according to any one of claims 1 to 8, wherein a handle is arranged on an outer side wall of the second box body, and the handle is used for driving the second box body to rotate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810873762.0A CN109167286B (en) | 2018-08-02 | 2018-08-02 | Live replacement device for current transformer of power distribution network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810873762.0A CN109167286B (en) | 2018-08-02 | 2018-08-02 | Live replacement device for current transformer of power distribution network |
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| CN109167286A CN109167286A (en) | 2019-01-08 |
| CN109167286B true CN109167286B (en) | 2021-10-26 |
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| CN107340409A (en) * | 2017-06-09 | 2017-11-10 | 国网上海市电力公司 | A kind of fast-wiring fixture for high-voltage mutual inductor |
| CN110165593B (en) * | 2019-05-29 | 2023-03-24 | 中国电力科学研究院有限公司 | Live replacement device and method for current transformer for metering cabinet |
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| JP3676638B2 (en) * | 2000-01-07 | 2005-07-27 | 東芝三菱電機産業システム株式会社 | Power system switching device and switching method |
| CN100431064C (en) * | 2002-12-27 | 2008-11-05 | 章岷 | Changing current ratio of 10KV and higher high-voltage current transformer under live condition |
| JP5064293B2 (en) * | 2008-04-28 | 2012-10-31 | 株式会社三英社製作所 | Bypass cable hot-wire removal tool |
| CN106816813A (en) * | 2017-03-17 | 2017-06-09 | 中国电力科学研究院 | The method of power distribution network current transformer installing structure and charged for replacement current transformer |
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