CN217719273U - Traction transformer protection device - Google Patents
Traction transformer protection device Download PDFInfo
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- CN217719273U CN217719273U CN202221332225.3U CN202221332225U CN217719273U CN 217719273 U CN217719273 U CN 217719273U CN 202221332225 U CN202221332225 U CN 202221332225U CN 217719273 U CN217719273 U CN 217719273U
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- conductive column
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Abstract
The utility model provides a traction transformer protection device, include: an external excitation connector; an isolation pulse transformer; and the high-speed breaker comprises an insulating shell, a first electric conductor, a second electric conductor, a breaking piece, a conductive column, an initiating explosive device, a breaking grid piece and an arc extinguish chamber, wherein the uniform ends of the first electric conductor and the second electric conductor extend into the insulating shell and are oppositely arranged, one end of the first electric conductor extending into the insulating shell is connected with the breaking piece, one end of the second electric conductor extending into the insulating shell is connected with one end of the conductive column, the other end of the conductive column is connected with the breaking piece, and the initiating explosive device is connected with an isolation pulse transformer. The utility model has the advantages that: when abnormal conditions occur, the control system sends out an excitation signal, the excitation signal triggers the high-speed breaker to break through the isolation pulse transformer, the breaker forms a fracture to quickly complete current breaking, direct current is prevented from passing through, and the primary winding of the traction transformer is prevented from being burnt by the heat caused by the direct current flowing through the long-time switch.
Description
Technical Field
The utility model relates to a circuit protection device technical field especially relates to a traction transformer protection device.
Background
The traction transformer protection device is connected in series in the alternating current high-voltage system and is positioned at the lower end of the traction transformer. When the external power grid is ready to be switched to direct current, the change-over switch should be communicated to the direct current side position firstly, the alternating current loop is disconnected, and the primary winding of the traction transformer cannot be electrified. However, if the switch is not switched to the dc side due to an abnormal reason and is connected to the traction transformer on the ac side, the primary winding of the traction transformer is overheated and burned out due to long-term dc current, and thus, in order to improve the safety of the circuit system, the traction transformer needs to be protected by a traction transformer protection device.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problem that the primary winding of the traction transformer is burnt out due to overheating caused by long-term direct current flowing, an embodiment of the present invention provides a protection device for a traction transformer.
An embodiment of the utility model provides a traction transformer protection device, include:
an external excitation connector for receiving an external excitation signal;
an isolation pulse transformer connected to the external excitation connector;
the high-speed breaker comprises an insulating shell, a first electric conductor, a second electric conductor, a breaking piece, a conductive column, an initiating explosive device, a breaking grid piece and an arc extinguish chamber, wherein one end of the first electric conductor and one end of the second electric conductor extend into the insulating shell and are oppositely arranged, the other end of the first electric conductor and the other end of the second electric conductor extend out of the insulating shell, one end of the first electric conductor extending into the insulating shell is connected with the breaking piece, one end of the second electric conductor extending into the insulating shell is connected with one end of the conductive column, the other end of the conductive column is connected with the breaking piece, the breaking grid piece and the initiating explosive device are sequentially arranged on one side, away from the conductive column, of the breaking piece, the initiating explosive device is connected with the isolation pulse transformer, and the arc extinguish chamber is arranged on the outer side, away from one end of the conductive column, away from the breaking piece;
the isolation pulse transformer is used for responding to the excitation signal and triggering the initiating explosive device, and the initiating explosive device is used for driving the breaking grid piece to cut off the breakable piece so as to break the first conductor and the second conductor.
Further, still include one fixed set up in spacing ring in the insulating casing, the spacing ring encircles break bars piece bottom and with break bars piece separation sets up, the inner wall of spacing ring is equipped with the conical surface, break bars piece top is equipped with the oblique angle, the conical surface can block break bars piece cuts off continue the motion behind the easy-to-break piece.
Furthermore, the insulating shell is located above and below the breakable piece and is provided with an upper annular cavity and a lower annular cavity respectively, wherein the breakable grid piece is of a sleeve structure with an opening at the lower end and is arranged in the upper annular cavity, the conductive column is arranged in the lower annular cavity, and the axes of the breakable grid piece and the conductive column are overlapped.
Furthermore, a melamine sleeve is embedded in the surface of the breaking grid piece, and an epoxy lining is arranged on the inner wall of the upper annular cavity.
Furthermore, a steel inner sleeve is arranged on the inner wall of the end part of the upper annular cavity, a piston is arranged between the initiating explosive device and the top of the breaking grid piece, the piston is arranged in the steel inner sleeve and abuts against the top of the breaking grid piece, and the output end of the initiating explosive device penetrates through the steel inner sleeve and abuts against the piston.
Furthermore, the first conductor and the second conductor are both L-shaped copper bars, and the conductive columns are copper columns.
Furthermore, one end of the first conductor extending into the insulating shell is provided with a breaking hole, the breakable piece is arranged under the breaking hole, the edge of the breaking hole is in contact connection with the edge of the breakable piece, one end of the conductive column is fixedly connected with one end of the second conductor extending into the insulating shell, and the other end of the conductive column extends to the breakable piece and is in contact connection with the breakable piece.
Furthermore, the breakable piece is a round silver piece, and a plurality of breakable holes which are uniformly distributed around the circle center of the breakable piece are formed in the middle of the breakable piece.
The device further comprises an indicator, wherein a trigger rod of the indicator is arranged on a moving path of the breaking grid piece and can be triggered when the breaking grid piece moves.
Furthermore, a steel wire mesh is arranged in the arc extinguish chamber.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the utility model discloses a traction transformer protection device, when normal work, alternating current flows through from high-speed breaker, and high-speed breaker is used for undertaking the through-flow task under normal operating condition, can bear the impact of specific surge current in the alternating current electric network and not damage; and an abnormal condition occurs, the control system sends out an excitation signal, the excitation signal triggers the high-speed breaker to break through the isolation pulse transformer, the breaker forms a fracture to quickly complete current breaking, direct current is prevented from passing through, and the primary winding of the traction transformer is prevented from being burnt by the heat caused by the flowing of the direct current for a long time.
Drawings
Fig. 1 is a schematic diagram of a traction transformer protection device of the present invention;
fig. 2 is a front view of a traction transformer protector of the present invention;
fig. 3 is a bottom view of the traction transformer protector of the present invention;
fig. 4 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A in fig. 3.
In the figure: 1-isolation pulse transformer, 2-high-speed breaker, 201-first conductor, 202-second conductor, 203-conductive column, 204-breakable piece, 205-breaking grid piece, 206-arc extinguish chamber, 207-outer shell, 208-left inner shell, 209-middle inner shell, 210-right inner shell, 211-piston, 212-initiating explosive device, 213-limit ring, 214-epoxy bush, 215-melamine sleeve, 216-steel inner sleeve, 217-melamine inner sleeve and 301-trigger rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings. The following description is of the preferred embodiment of the present invention and is provided to enable a person of ordinary skill in the art to make and use the invention and is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a traction transformer protection device, which is mainly applied to a main circuit topology structure, specifically located at a lower end of the traction transformer, and mainly includes an external excitation connector, an isolation pulse transformer 1 and a high-speed breaker 2.
Specifically, the external excitation connector is used for receiving an external excitation signal, and the external excitation signal is externally sent out when the circuit is abnormal, that is, when a direct current is input to a primary side of the traction transformer in a high-voltage system, the external excitation signal is externally sent out. The isolation pulse transformer 1 is connected with the external excitation connector, and the isolation pulse transformer 1 triggers the high-speed breaker 2 after receiving the excitation signal.
As shown in fig. 2, 3 and 4, the high-speed circuit breaker 2 includes an insulating housing, a first conductor 201, a second conductor 202, a breakable piece 204, a conductive column 203, a initiating explosive device 212, a breaking grid piece 205 and an arc extinguishing chamber 206.
Specifically, the insulating housing is made of an insulating material, and includes an outer housing 207, and a left inner housing 208, a middle inner housing 209, and a right inner housing 210, which are sequentially disposed inside the outer housing 207 from left to right. An upper annular cavity and a lower annular cavity with coincident axes are respectively arranged in the insulating shell, wherein the upper annular cavity is arranged in the left inner shell 208, and the lower annular cavity is arranged in the middle inner shell 209.
One end of the first conductor 201 and the other end of the second conductor 202 extend into the insulating shell and are arranged oppositely, and the other end extends out of the insulating shell. Specifically, the first conductor 201 and the second conductor 202 are both L-shaped copper bars, one side of each of the first conductor 201 and the second conductor 202 is horizontally arranged, and the end of each of the first conductor 201 and the second conductor 202 extends out of the insulating casing, and the other side of each of the first conductor 201 and the second conductor 202 is vertically arranged, and the end of each of the other sides of each of the first conductor and the second conductor extends into the insulating casing. The first conductor 201 is clamped and fixed by the left inner housing 208 and the middle inner housing 209, and the second conductor 202 is clamped and fixed by the middle inner housing 209 and the right inner housing 210. In this way, the end portions of the vertical sides of the first and second conductive bodies 201 and 22 extend into the insulating housing and are located at two ends of the lower annular cavity respectively.
As shown in fig. 4, the first conductive body 201 extends into the insulating housing and is connected to the break 204 at one end. Specifically, a breaking hole is formed in one end of the first conductor 201 extending into the insulating housing, the breakable piece is disposed right below the breaking hole, and an edge of the breaking hole is in contact connection with an edge of the breakable piece 204. The easy-breaking piece 204 is a round silver piece and has excellent conductivity, a plurality of easy-breaking holes uniformly distributed around the circle center of the easy-breaking piece 204 are formed in the middle of the easy-breaking piece 204, and the easy-breaking holes are arranged to form a weak ring easy to cut off and can be easily cut off.
The second conductive body 202 extends into the insulating housing, one end of the second conductive body is connected to one end of the conductive column 203, and the other end of the conductive column 203 is connected to the breakable portion 204. The conductive column 203 is a copper column, and the conductive column 203 is disposed in the lower annular cavity and maintains a gap with the inner wall of the lower annular cavity. The conductive column 203 has one end fixedly connected to one end of the second conductive body 202 extending into the insulating housing, and the other end extending to the breakable portion 204 and connected to the middle contact thereof, where the end of the conductive column 203 should be within the range surrounded by the breakable holes of the breakable portion 204.
Continuing as shown in fig. 4, the breaking grid plate 205 and the initiating explosive device 212 are sequentially disposed on a side of the breaking plate 204 departing from the conductive pillar 203, wherein the breaking grid plate 212 is a sleeve structure with an opening at a lower end and disposed in the upper annular cavity, the axis of the breaking grid plate coincides with the axis of the conductive pillar, and the inner hole diameter of the breaking grid plate 212 is greater than the diameter 203 of the conductive pillar. The output end of the initiating explosive device 212 is connected with the breaking grid piece 205, the initiating explosive device 212 is connected with the isolation pulse transformer 1, the isolation pulse transformer 1 can ignite the initiating explosive device to trigger the initiating explosive device, and the breaking grid piece 205 is driven to move to cut off the breaking-prone piece 204.
Preferably, a steel inner sleeve 216 is arranged on the inner wall of the end portion of the upper annular cavity, a piston 211 is arranged between the initiating explosive device 212 and the top of the breaking grid piece 205, the piston 211 is arranged in the steel inner sleeve 216 and abuts against the top of the breaking grid piece 205, the output end of the initiating explosive device 212 penetrates through the steel inner sleeve 216 and abuts against the piston 211, the steel inner sleeve 216 can improve the structural strength of the upper inner shell 208, the upper inner shell 208 is prevented from being damaged when the initiating explosive device 212 is triggered, the piston 211 can better transmit the acting force of the initiating explosive device 212 to the breaking grid piece 205, and the breaking grid piece 205 can stably move to break the breaking grid piece 204.
In order to ensure the insulation effect of the break-off gate 205 after the break-off gate 204 is cut off, a step concave surface is arranged on the surface of the break-off gate 205, a melamine sleeve 215 is embedded in the step concave surface, an epoxy bushing 214 is arranged on the inner wall of the upper annular cavity, and the epoxy bushing 214 surrounds the break-off gate 205. The inner wall of the lower annular cavity is provided with a melamine inner sleeve 217, and the melamine inner sleeve 217 surrounds the conductive post 203.
In addition, a limiting ring 213 is further disposed in the insulating housing to limit the movement of the breaking gate 205 after the breaking gate is cut off. The limiting ring 213 is made of an epoxy material, surrounds the bottom of the break-off gate 205, and is specifically fixed to the bottom of the inner wall of the upper annular cavity, and before the break-off gate 205 does not cut off the breakable piece 204, the limiting ring 213 is not in contact with or separated from the break-off gate 205. The inner wall of the limiting ring 213 is provided with a tapered surface, the top of the break gate 205 is provided with an oblique angle, and after the break gate 205 does not cut off the break-off sheet 204, the break gate 205 enters the lower annular cavity and moves along the lower annular cavity until the tapered surface blocks the break gate 205 to continue moving, so as to prevent the break gate 205 from continuing moving and impacting the conductive post 203 to damage the break gate 205 or cause the conductive post 203 to deform.
The explosion chamber 206 sets up it deviates from to lead electrical pillar 203 the outside of easy-breaking piece 204 one end, the explosion chamber 206 specifically set up in the right side inner shell 210, be equipped with the wire net in the explosion chamber 206, the wire net absorbs the arcing energy that divides the breaking process in-process and produce.
In addition, the traction transformer protection device further comprises an indicator 3, the trigger rod 301 of the indicator 3 is arranged on the moving path of the trip gate piece 205 and is abutted against the outer wall of the epoxy bushing 214, and when the trip gate piece 205 moves, the epoxy bushing 214 is squeezed to push the trigger rod 301, so that the indicator 3 is triggered. The indicator 3 reflects the opening of the high-speed disconnector 2, i.e. for feeding back the operating state of the traction transformer protection.
As shown in fig. 1 and 4, the working principle of the traction transformer protection device is as follows: the first conductor 201 and the second conductor 202 are connected in series to the main circuit at the lower end of the traction transformer, and the external excitation connector is connected to an external control system. When alternating current flows through the main circuit, the current directly flows between the first conductor 201 and the second conductor 201 of the high-speed breaker 2, and the traction transformer protection device bears the current flowing task in the normal working state. When the main circuit passes through direct current, an external control system sends an excitation signal to the external excitation connector, the external excitation connector processes the excitation signal and transmits the excitation signal to the isolation pulse transformer 1, so that the isolation pulse transformer 1 triggers the initiating explosive device 212, the initiating explosive device 212 drives the breaking grid piece 205 to move and cut off the breakable piece 204 until the breakable piece moves into the lower annular cavity, the arc extinguishing chamber 206 absorbs arc energy generated in the breaking process and cuts off direct current between the first conductor 201 and the second conductor 202, the direct current is prevented from passing through, and the primary winding of the traction transformer is prevented from being burnt by the heat caused by the long-time direct current flowing through.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It should be understood that they are relative concepts, which may be varied in relation to their use and placement, and that the use of directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A traction transformer protection device is characterized in that: the method comprises the following steps:
an external excitation connector for receiving an external excitation signal;
an isolation pulse transformer connected to the external excitation connector;
the high-speed breaker comprises an insulating shell, a first electric conductor, a second electric conductor, a breaking piece, a conductive column, an initiating explosive device, a breaking grid piece and an arc extinguish chamber, wherein one end of the first electric conductor and one end of the second electric conductor extend into the insulating shell and are oppositely arranged, the other end of the first electric conductor and the other end of the second electric conductor extend out of the insulating shell, one end of the first electric conductor extending into the insulating shell is connected with the breaking piece, one end of the second electric conductor extending into the insulating shell is connected with one end of the conductive column, the other end of the conductive column is connected with the breaking piece, the breaking grid piece and the initiating explosive device are sequentially arranged on one side, away from the conductive column, of the breaking piece, the initiating explosive device is connected with the isolation pulse transformer, and the arc extinguish chamber is arranged on the outer side, away from one end of the conductive column, away from the breaking piece;
the isolation pulse transformer is used for responding to the excitation signal and triggering the initiating explosive device, and the initiating explosive device is used for driving the breaking grid piece to cut off the breaking piece so as to break the first conductor and the second conductor.
2. A traction transformer protector as claimed in claim 1 in which: still include one fixed set up in spacing ring in the insulating casing, the spacing ring encircle break bars piece bottom and with break bars piece separation sets up, the inner wall of spacing ring is equipped with the conical surface, break bars piece top is equipped with the oblique angle, the conical surface can block break bars piece cuts off continue the motion behind the easy-breaking piece.
3. A traction transformer protector as claimed in claim 1 in which: the insulating shell is located above and below the breakable piece and is provided with an upper annular cavity and a lower annular cavity respectively, wherein the breakable grid piece is of a sleeve structure with an opening at the lower end and is arranged in the upper annular cavity, the conductive column is arranged in the lower annular cavity, and the axis of the breakable grid piece coincides with the axis of the conductive column.
4. A traction transformer protector as claimed in claim 3 in which: the surface of the break-off grid piece is embedded with a melamine sleeve, and the inner wall of the upper annular cavity is provided with an epoxy lining.
5. A traction transformer protector as claimed in claim 3 in which: the inner wall of the end part of the upper annular cavity is provided with a steel inner sleeve, a piston is arranged between the initiating explosive device and the top of the breaking grid piece, the piston is arranged in the steel inner sleeve and is abutted against the top of the breaking grid piece, and the output end of the initiating explosive device penetrates through the steel inner sleeve and is abutted against the piston.
6. A traction transformer protector as claimed in claim 1 in which: the first conductor and the second conductor are both L-shaped copper bars, and the conductive columns are copper columns.
7. A traction transformer protector as claimed in claim 6 in which: the first conductor extends to one end in the insulating shell and is provided with a breaking hole, the breakable piece is arranged under the breaking hole, the edge of the breaking hole is in contact connection with the edge of the breakable piece, one end of the conductive column is fixedly connected with one end of the second conductor extending into the insulating shell, and the other end of the conductive column extends to the breakable piece and is in contact connection with the breakable piece.
8. A traction transformer protector as claimed in claim 7 in which: the easy-breaking piece is a round silver piece, and a plurality of easy-breaking holes which are uniformly distributed around the circle center of the easy-breaking piece are formed in the middle of the easy-breaking piece.
9. A traction transformer protector as claimed in claim 1 in which: the device also comprises an indicator, wherein a trigger rod of the indicator is arranged on a movement path of the breaking grid piece and can be triggered when the breaking grid piece moves.
10. A traction transformer protector as claimed in claim 1 in which: and a steel wire mesh is arranged in the arc extinguish chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221332225.3U CN217719273U (en) | 2022-05-30 | 2022-05-30 | Traction transformer protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221332225.3U CN217719273U (en) | 2022-05-30 | 2022-05-30 | Traction transformer protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217719273U true CN217719273U (en) | 2022-11-01 |
Family
ID=83796085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221332225.3U Active CN217719273U (en) | 2022-05-30 | 2022-05-30 | Traction transformer protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217719273U (en) |
-
2022
- 2022-05-30 CN CN202221332225.3U patent/CN217719273U/en active Active
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