CN209880524U - Switch of asymmetric current source and asymmetric current source - Google Patents
Switch of asymmetric current source and asymmetric current source Download PDFInfo
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- CN209880524U CN209880524U CN201921055979.7U CN201921055979U CN209880524U CN 209880524 U CN209880524 U CN 209880524U CN 201921055979 U CN201921055979 U CN 201921055979U CN 209880524 U CN209880524 U CN 209880524U
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Abstract
The utility model discloses a switch of asymmetric current source, including the first conductor block that links to each other with high-pressure inlet wire end and the second conductor block that links to each other with the leading-out terminal, be provided with between first conductor block and second conductor block and revolve the conductor block, make when revolving the conductor block rotatory between first conductor block and the second conductor block become on-state then become insulating state again by insulating state. The device can realize that the non-fault phase is switched on in a short enough time, thereby generating characteristic current, not bringing negative influence to the line, and simultaneously, the manufacturing cost is lower. The utility model also discloses an asymmetric current source.
Description
Technical Field
The utility model relates to a detect single-phase ground connection's of electric power system high voltage line device, concretely relates to asymmetric current source's switch and the asymmetric current source of preparation from this.
Background
At present, most power distribution networks in China adopt systems with central points not directly grounded, the power distribution systems have many and complex branches, and when single-phase ground faults occur in the systems, the fault points are very difficult to search due to small fault current and complex fault characteristics; a large amount of manpower, material resources and time are consumed for finding out a specific fault position, fault judgment generally depends on the experience of people or the investigation of fault line patrol personnel, the power failure operation time of equipment maintenance is long, and the power failure range is large. The utility model patent CN201859161U discloses an asymmetric current source, including secondary control part, electron PT, relay operation case and interchange high pressure vacuum contactor, the input of secondary control part is inserted to electron PT secondary side, and the output of secondary control part connects the relay operation case, and relay operation case control exchanges high pressure vacuum contactor's coil, and interchange high pressure vacuum contactor has threely, and the arbitrary double-phase of A, B, C three-phase is connected respectively to the side once, and the opposite side is established ties and is connect high voltage diode and current limiting resistor, and another termination ground of current limiting resistor. If a single-phase ground fault of the high-voltage line occurs, the ground phase-to-ground voltage is reduced, the non-fault phase-to-ground voltage is increased, the asymmetric current source supplies power to a fault indicator on the high-voltage line by enabling the non-fault phase to artificially form a closed loop with the ground, and the fault indicator emits light to indicate the fault line. Utility model CN202815149U has further optimized above-mentioned patent, only uses two interchange high pressure vacuum contactor just can realize above-mentioned function. Utility model CN20533704U further discloses a double-phase asymmetric current source of the adjustable type of resistance, can the ground connection characteristic current size of automatic adjustment to guarantee that earth fault can both make fault indicator luminous in order to instruct the trouble route at every turn. However, when the ac high-voltage vacuum contactor is used to control the on-off of the non-fault phase high-voltage line, the non-fault phase high-voltage line cannot be immediately switched off (for example, the time is shorter than 10 milliseconds) after the line is switched on, so that the time for artificially grounding the non-fault phase is too long (hundreds of milliseconds), and other accidents are easily caused, which becomes an important bottleneck limiting the popularization and application of the asymmetric current source. And the vacuum contactor that above-mentioned asymmetric current source used often the cost is comparatively expensive, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a switch of asymmetric current source, it can realize that non-trouble looks switch on in enough short time to can produce characteristic current, not bring negative effects to the circuit again, its cost is comparatively cheap simultaneously.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a switch of an asymmetric current source comprises a first conductor block connected with a high-voltage wire inlet end and a second conductor block connected with a wire outlet end, wherein a rotary conductor block is arranged between the first conductor block and the second conductor block, and when the rotary conductor block rotates, the first conductor block and the second conductor block are changed from an insulation state to a conduction state and then to an insulation state.
Preferably, the end portions of the first conductor block and the second conductor block are concave arc surfaces, the two ends of the spin conductor block are convex arc surfaces, the spin conductor block rotates around a central axis of the spin conductor block, the central axis is also the central axis of the first cylindrical surface and the central axis of the second cylindrical surface, the concave arc surfaces of the first conductor block and the second conductor block are located on the first cylindrical surface, the convex arc surfaces of the two ends of the spin conductor block are located on the second cylindrical surface, and the two sides of the spin conductor block are wrapped by the insulating sheaths.
Preferably, the first conductor block, the second conductor block and the spinning conductor block are rectangular blocks, and the spinning conductor block rotates around the central axis of the spinning conductor block.
Preferably, the ends of the first conductor block, the second conductor block and the spinning conductor block are triangular, and the spinning conductor block rotates around the central axis of the spinning conductor block.
Preferably, the first and second conductor blocks are supported on the elastic member, and ends of the first conductor block protrude to form first contact terminals, ends of the second conductor block protrude to form second contact terminals, and ends of the rotary conductor block protrude to form pressing ends, which press the first and second contact terminals when the rotary conductor block is rotated.
Further, the first conductor block and the second conductor block are supported on the elastic member, the rotary conductor block is located on one diameter of the disk, the disk is made of an insulating material except for the rotary conductor block, and the insulating material or the rotary conductor block is in contact with the first conductor block and the second conductor block when the disk rotates.
Preferably, the rotary conductor block is driven to rotate by a stepping motor or a spring energy storage system.
Another object of the present invention is to provide an asymmetric current source, which adopts the following technical solution:
the asymmetric current source comprises a box body, wherein the wire inlet ends of three-phase high-voltage wires penetrate through the box body and are respectively connected with three switches, the switches are the switches of the asymmetric current source, the wire inlet ends of the three-phase high-voltage wires are respectively connected with a first conductor block of each switch, and the wire outlet end of a second conductor block of each switch is connected with the ground.
Or the following technical scheme is adopted:
the asymmetric current source comprises a box body, wherein two phase incoming line ends in a three-phase high-voltage line penetrate through the box body and are respectively connected with two switches, the switches are the switches of the asymmetric current source, the two phase incoming line ends in the three-phase high-voltage line are respectively connected with a first conductor block of each switch, and an outgoing line end of a second conductor block of each switch is connected with the ground.
SF6 gas is filled in the box body.
In the utility model, the rotation of the rotary conductor block is controlled by the stepping motor, the state change from insulation to conduction to insulation between the first conductor block and the second conductor block can be realized, the rotary conductor block in the initial state is transverse, the two ends of the rotary conductor block are far away from the first conductor block and the second conductor block, at the moment, the first conductor block and the second conductor block are in the insulation state, when the action is needed, the stepping motor drives the rotary conductor block to rotate by 180 degrees, the rotary conductor block is still in the transverse insulation state after the rotation, but in the rotating process, the distance between the rotary conductor block and the first conductor block and the second conductor block is from far to near, the insulation state between the first conductor block and the second conductor block can be destroyed, so that the characteristic current is generated by conduction, then along with the rotation, the distance between the rotary conductor block and the first conductor block and the second conductor block is from near to far, so that the insulation state is recovered, the conduction time between the first conductor block and the second conductor block can be controlled by the rotation speed of the stepping motor and the thicknesses of the rotating conductor block and the first conductor block and the second conductor block, and can be easily controlled within less than 10 milliseconds, such as the conduction lasts for only 5 milliseconds. When a certain phase ground fault occurs, the stepping motor on the non-ground phase can be started to rotate 180, and the non-ground phase can generate instantaneous ground and further form a loop with the fault, so that characteristic current is generated and the fault is indicated. The asymmetric current source may be provided with two or three of the above-described switches. The characteristic current generated by the asymmetric current source corresponds to the switch-on time, has obvious characteristics, is very easy to locate faults, has low manufacturing cost and is suitable for popularization and use. The preset time is set to be about 5 milliseconds, so that the influence on a high-voltage line is avoided, and the defect that the time for non-fault grounding of the conventional asymmetric current source is too long is overcome. The design can omit a current-limiting resistor and a diode, so that the whole device has a simple and reliable structure.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention (the rotary conductor block is located at a horizontal position);
fig. 2 is a schematic structural view of embodiment 1 of the present invention (the rotating conductor block is located at a vertical position, and is turned on at this time);
FIG. 3 is a schematic diagram of the three-phase asymmetric current source of the present invention;
fig. 4 is a schematic diagram of the two-phase asymmetric current source of the present invention;
fig. 5 is a schematic structural diagram of embodiment 2 of the switch of the present invention;
fig. 6 is a schematic structural diagram of embodiment 3 of the switch of the present invention;
fig. 7 is a schematic structural diagram of a preferred embodiment of a switch of example 3 of the present invention;
fig. 8 is a schematic structural diagram of another preferred embodiment of the switch of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples:
fig. 1 and fig. 2 are schematic structural diagrams of the first embodiment of the present invention, the switch of the asymmetric current source is located in the box 1, the first conductor block 2 is connected to the incoming line end 201 of the high voltage line (generally 10 KV), the box 1 is provided with the wall bushing 3 for insulation between the high voltage line and the box, and the second conductor block 4 is connected to the outgoing line end 401. A rotary conductor block 5 is arranged between the first conductor block and the second conductor block, the rotary conductor block 5 is connected with an output shaft of a stepping motor 6, and the output shaft of the stepping motor is positioned on the central axis of the rotary conductor block 5. The ends of the first conductor block and the second conductor block are concave arc surfaces, the two concave arc surfaces are positioned on the same first cylindrical surface, the two ends of the rotary conductor block 5 are convex arc surfaces, the two convex arc surfaces are positioned on the same second cylindrical surface, the cross section diameter of the first cylindrical surface is larger than or basically equal to that of the second cylindrical surface, and the central axes of the first cylindrical surface and the second cylindrical surface are the same as the central axis of the rotary conductor block 5. Thus, when the rotary conductor block 5 rotates between the first conductor block and the second conductor block, both ends of the rotary conductor block substantially contact the concave arc surfaces of both ends of the first conductor block and the second conductor block, or have a certain gap, but the conduction between the first conductor block and the second conductor block can be ensured under a given high pressure, in order to reduce the arc light generated during the contact, the rotary conductor block can be wrapped with an insulating sheath on both sides, but both ends contacting the first conductor block and the second conductor block cannot have insulating materials.
The initial position of the rotary conductor block 5 is set in the transverse direction (fig. 1), which enables the first conductor block and the second conductor block to be kept in an insulating state under a given high pressure, the rotary conductor block 5 can be rotated 180 degrees at a set speed under the driving of the stepping motor 6, the first conductor block and the second conductor block are conducted and maintained for a certain time (such as 5 milliseconds, 10 milliseconds and the like) in the process of rotating to approach the first conductor block and the second conductor block (fig. 2), then the two ends of the rotary conductor block are far away from the two ends of the first conductor block and the second conductor block, and the first conductor block and the second conductor block are enabled to be restored to the insulating state. The conduction time can be controlled and adjusted by controlling the rotation speed of the rotary conductor block, the transverse widths of the first conductor block, the second conductor block and the rotary conductor block, and the like, and the conduction can be ensured in the short time.
When manufacturing asymmetric current source, three switches are selected to be installed in the box body, and SF is charged in the box body6The first conductor blocks of the three switches are respectively connected with the wire inlet end of the three-phase high-voltage wire, the second conductor blocks are connected with the wire outlet end, and the wire outlet end is connected with the ground. Because the conduction time is short, the current can be generated in a large time without causing damage, and a diode, a current limiting resistor and the like are not required to be connected. Of course, a secondary control part can be added to the asymmetric current source, so that the earth fault can be automatically monitored, and the action of the stepping motor is controlled to generate the characteristic current (figure 3).
Or only two of the three-phase high-voltage wires can be connected to the asymmetric current source, at this time, two switches are arranged in the box body, the incoming wire is connected with the first conductor block, the second conductor block is connected with the wire outlet end, and the wire outlet end is directly connected with the ground (figure 4). Reference may be made to utility model CN202815149U for specific principles.
Figures 5 and 6 show two further embodiments of the invention, namely the case where the first conductor block 2, the second conductor block 4 and the selection conductor block 5 are rectangular and the case where the three end portions are triangular, both embodiments being provided to ensure that the first conductor block and the second conductor block are insulated from each other when the selection conductor block is in a lateral position and to ensure that the first conductor block and the second conductor block are conductive for a certain period of time (typically a few milliseconds) when both end portions approach the first conductor block and the second conductor block during a 180 degree turn. The ends of the first conductor block, the second conductor block and the spin conductor block may be trapezoidal or have other shapes, but they must be insulated in the lateral direction and must be conducted for a certain period of time when rotated 180 degrees.
Fig. 7 shows an optimized embodiment, in order to reduce the arc, the first conductor block can be mounted on the compression spring 801, the second conductor block can be mounted on the compression spring 802 (of course, the first conductor block and the second conductor block can be mounted on the transverse elastic rod respectively), and the end parts of the first conductor block and the second conductor block are protruded to form an arc shape or a triangular shape as the first contact end 803 and the second contact end 804 respectively, the two ends of the rotating conductor block 5 are protruded to form a triangular shape or an arc shape as the pressing end 805, and when the rotating conductor block passes between the first conductor block and the second conductor block, the two pressing ends respectively contact and press the first contact end and the second contact end, so that the arc can be reduced and the service life can be prolonged.
In the above embodiment, a spring energy storage system may be provided to drive the rotary conductor block to rotate.
Fig. 8 shows another preferred embodiment of the present invention, in order to ensure that the rotary conductor block 5 can smoothly contact with the first conductor block 2 and the second conductor block 4 during the rotation, the insulating material is added on both sides by taking the rotary conductor block 5 as a diameter to form a disc 9, the disc 9 rotates around the center of the circle, the first conductor block and the second conductor block are not connected when the insulating material on both sides contacts with the first conductor block and the second conductor block during the rotation, and the first conductor block and the second conductor block are connected when the rotary conductor just rotates to the position between the first conductor block and the second conductor block.
The above embodiments are only a few descriptions of the concept and implementation of the present invention, and are not intended to limit the same, and the technical solutions without substantial changes are still within the protection scope under the concept of the present invention.
Claims (10)
1. A switch of an asymmetric current source comprises a first conductor block connected with a high-voltage wire inlet end and a second conductor block connected with a wire outlet end, wherein a rotary conductor block is arranged between the first conductor block and the second conductor block, and when the rotary conductor block rotates, the first conductor block and the second conductor block are changed from an insulation state to a conduction state and then to an insulation state.
2. The asymmetric-current-source switch of claim 1, wherein the ends of the first and second conductor blocks are concave arc surfaces, the ends of the spin conductor block are convex arc surfaces, the spin conductor block rotates around its central axis, the central axis is the central axis of the first and second cylindrical surfaces, the concave arc surfaces of the first and second conductor blocks are located on the first cylindrical surface, the convex arc surfaces of the spin conductor block are located on the second cylindrical surface, and the spin conductor block is wrapped with an insulating sheath on both sides.
3. The asymmetric-current-source switch of claim 1, wherein the first conductor block, the second conductor block, and the spinning conductor block are rectangular blocks, and the spinning conductor block rotates about its central axis.
4. The asymmetric-current-source switch of claim 1, wherein the first conductor block, the second conductor block, and the spinning conductor block are triangular in shape, and the spinning conductor block rotates about its central axis.
5. The asymmetric current source switch of claim 1, wherein the first and second conductor blocks are supported on a spring member and wherein the ends of the first conductor block project to form first contact terminals and the ends of the second conductor block project to form second contact terminals, and wherein the ends of the rotary conductor block project to form compression ends that compress the first and second contact terminals as the rotary conductor block rotates.
6. The switch of claim 1, wherein the first and second conductor blocks are supported on a resilient member, the rotating conductor block being located on a diameter of a disk, the disk being an insulating material except for the rotating conductor block, the insulating material or the rotating conductor block contacting the first and second conductor blocks as the disk rotates.
7. The switch for an asymmetric current source according to any one of claims 1 to 6, wherein the rotary transducer block is driven in rotation by a stepper motor or a spring energy storage system.
8. An asymmetric current source, comprising a box body, the incoming line ends of three-phase high voltage wires pass through the box body and are respectively connected with three switches, characterized in that the switches are the switches of the asymmetric current source as claimed in claim 7, the incoming line ends of the three-phase high voltage wires are respectively connected with a first conductor block of the switches, and the outgoing line end of a second conductor block of the switches is connected with the ground.
9. An asymmetric current source, comprising a box body, wherein the incoming line ends of two phases in a three-phase high-voltage wire are respectively connected with two switches through the box body, the switch is the switch of the asymmetric current source according to claim 7, the incoming line ends of two phases in the three-phase high-voltage wire are respectively connected with a first conductor block of the switch, and the outgoing line end of a second conductor block of the switch is connected with the ground.
10. The asymmetric current source of claim 9, wherein said tank is filled with SF6A gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921055979.7U CN209880524U (en) | 2019-07-08 | 2019-07-08 | Switch of asymmetric current source and asymmetric current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921055979.7U CN209880524U (en) | 2019-07-08 | 2019-07-08 | Switch of asymmetric current source and asymmetric current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209880524U true CN209880524U (en) | 2019-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921055979.7U Active CN209880524U (en) | 2019-07-08 | 2019-07-08 | Switch of asymmetric current source and asymmetric current source |
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| Country | Link |
|---|---|
| CN (1) | CN209880524U (en) |
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2019
- 2019-07-08 CN CN201921055979.7U patent/CN209880524U/en active Active
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