A stable direct current circuit breaker oscillation characteristic measuring device

Abstract

The application discloses a stable direct-current circuit breaker oscillation characteristic measuring device, which comprises a main body composed of a shell, an operation panel arranged on one side of the shell and a measuring mechanism arranged in the shell, a wire passing support is movably connected to the side of the shell and close to the operation panel, and the wire passing support is arranged in one-to-one correspondence with the interfaces on the operation panel; the interfaces of the wire passing support and the operation panel are horizontally arranged, and the measuring cable between the interfaces of the wire passing support and the operation panel has a movement allowance. The stable direct-current circuit breaker oscillation characteristic measuring device with the above structure can make the wiring more stable and does not affect the normal use of the operation panel by arranging the wire passing support, winding a part of the measuring cable on the wire passing support and then inserting the remaining part into the corresponding interface position of the operation panel.

Description

Technical Field

[0001] This invention relates to the field of oscillation characteristic measurement technology, and in particular to a device for measuring the oscillation characteristics of a stable DC circuit breaker. Background Technology

[0002] As a crucial device in converter stations for converting DC current, the DC current conversion capability of DC circuit breakers is a vital factor in evaluating their performance. Since DC current has no zero-crossing point, DC circuit breakers need to "artificially cross" the DC current to achieve this conversion. The principle behind this is that an LC resonant circuit is connected in parallel with a conventional AC circuit breaker. During the opening and closing process, the LC resonant circuit generates an oscillating current that is applied across the circuit breaker terminals, forcing the current at both ends to cross zero, thus achieving the breaking purpose. Therefore, it is necessary to use a DC circuit breaker oscillation characteristic measurement device to detect the oscillation characteristics of the DC circuit breaker.

[0003] During the measurement process, multiple measurement cables need to be connected to the corresponding interface positions on the operation panel of the DC circuit breaker oscillation characteristic measurement device. Currently, due to the lack of cable positioning components, the cables are easily accidentally touched after being connected to the interface positions on the operation panel, resulting in unstable connections. At the same time, the messy cable connections affect further operation of the operation panel. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a stable DC circuit breaker oscillation characteristic measuring device. By setting a wire guide bracket, the remaining portion of the measuring cable after being wound onto the wire guide bracket can be inserted into the corresponding interface position on the operation panel, making the wiring more stable without affecting the normal use of the operation panel.

[0005] To achieve the above objectives, the present invention provides a stable DC circuit breaker oscillation characteristic measuring device, comprising a main body consisting of a housing, an operation panel disposed on one side of the housing, and a measuring mechanism disposed inside the housing. A wire guide is movably connected to the side of the housing near the operation panel, and the wire guide is configured to correspond one-to-one with the interfaces on the operation panel.

[0006] The interface between the cable guide bracket and the operation panel is set horizontally, and the measurement cable between the interface between the cable guide bracket and the operation panel has a certain amount of flexibility.

[0007] Preferably, a receiving groove is provided on the side of the outer casing and at the position corresponding to the cable guide bracket, and the cable guide bracket is rotatably connected to the receiving groove near the operation panel via a rotation positioning component;

[0008] Measurement cables are wound around the cable guide bracket.

[0009] Preferably, the cable guide bracket includes a mounting plate and two L-shaped support rods symmetrically arranged on the side of the mounting plate away from the housing, with measuring cables wound around the outer sides of the two L-shaped support rods.

[0010] Preferably, the L-shaped support rod includes a transverse rod connected to the mounting plate at one end and a longitudinal rod integrally formed with the other end of the transverse rod, and the transverse rod is slidably connected to the mounting plate via a tensioning assembly;

[0011] The two L-shaped support rods move in opposite directions under the action of the tensioning assembly.

[0012] Preferably, the tensioning assembly includes a radial guide groove corresponding to the transverse rod opened on the mounting plate, a tensioning block slidably disposed inside the radial guide groove, and a tensioning spring connected between the tensioning block and the inner wall of the radial guide groove;

[0013] The tensioning block is fixedly connected to the transverse rod;

[0014] The radial guide grooves of the two L-shaped support rods are located on the same straight line, and the tension springs of the two L-shaped support rods are arranged opposite each other.

[0015] Preferably, the rotating positioning assembly includes a rotating sleeve fixed to the side of the receiving groove near the operation panel, a rotating shaft rotatably disposed inside the rotating sleeve, a positioning groove is provided on the rotating shaft, one side of the locking connector is connected to the positioning groove via a positioning spring, the other side of the locking connector extends out of the positioning groove, and locking grooves are provided on the inner wall of the rotating sleeve corresponding to the positions of the receiving groove and the operation panel respectively, and the locking grooves are adapted to the locking connectors.

[0016] The two ends of the rotating shaft pass through the rotating sleeve and are fixedly connected to the mounting plate.

[0017] Preferably, the interfaces on the operation panel include DC high voltage output terminals, current measurement terminals, circuit breaker energy storage circuit wiring terminals, and circuit breaker opening and closing control circuit wiring terminals;

[0018] The DC high voltage output terminal is electrically connected to the energy storage component via a measuring cable. The energy storage component is also connected in parallel with the surge arrester and the circuit breaker under test, and the circuit breaker under test is connected in series with the Rogowski coil.

[0019] The circuit breaker under test is also electrically connected to the circuit breaker energy storage circuit terminals and the circuit breaker opening and closing control circuit terminals via measuring cables.

[0020] The Rogowski coil is also electrically connected to the current measuring terminal via a measuring cable;

[0021] Energy storage components include energy storage capacitors and energy storage inductors.

[0022] The present invention has the following beneficial effects:

[0023] 1. By setting up a cable guide bracket, after a portion of the measuring cable is wound onto the cable guide bracket, the remaining portion can be inserted into the corresponding interface position on the operation panel, making the wiring more stable without affecting the normal use of the operation panel.

[0024] 2. When not wiring, the cable guide bracket can be rotated to retract into the receiving slot on the side of the housing for easy storage.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a stable DC circuit breaker oscillation characteristic measuring device according to the present invention;

[0027] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0028] Figure 3 This is a schematic diagram of the line support structure of a stable DC circuit breaker oscillation characteristic measuring device according to the present invention;

[0029] Figure 4 This is an assembly diagram of the rotating shaft of a stable DC circuit breaker oscillation characteristic measuring device according to the present invention.

[0030] The components include: 1. Operation panel; 11. DC high voltage output terminal; 12. Current measurement terminal; 13. Circuit breaker opening and closing control circuit wiring terminal; 14. Circuit breaker energy storage circuit wiring terminal; 2. Cable guide bracket; 21. Mounting plate; 22. L-shaped support rod; 23. Rotating sleeve; 24. Rotating shaft; 25. Tensioning spring; 26. Tensioning block; 27. Clamping connector; 28. Positioning spring; 3. Circuit breaker under test; 4. Surge arrester; 5. Rogowski coil; 6. Measuring cable. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0032] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0033] Similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] like Figures 1-4 As shown, a stable DC circuit breaker oscillation characteristic measuring device includes a main body consisting of a housing, an operation panel 1 disposed on one side of the housing, and a measuring mechanism disposed inside the housing. A wire guide 2 is movably connected to the side of the housing near the operation panel 1. The wire guide 2 is arranged in a one-to-one correspondence with the interface on the operation panel 1. The interface between the wire guide 2 and the operation panel 1 is horizontally arranged, and the measuring cable 6 between the interface between the wire guide 2 and the operation panel 1 has a movable slack.

[0037] Preferably, a receiving groove is provided on the side of the outer casing and at the position corresponding to the wire guide bracket 2. The wire guide bracket 2 is rotatably connected to the receiving groove near the operation panel 1 via a rotation positioning component. A measuring cable 6 is wound on the wire guide bracket 2.

[0038] Preferably, the cable guide bracket 2 includes a mounting plate 21 and two L-shaped support rods 22 symmetrically arranged on the side of the mounting plate 21 away from the outer shell, with measuring cables 6 wound around the outer sides of the two L-shaped support rods 22.

[0039] Preferably, the L-shaped support rod 22 includes a transverse rod connected to the mounting plate 21 at one end and a longitudinal rod integrally formed with the other end of the transverse rod. The transverse rod is slidably connected to the mounting plate 21 via a tensioning assembly. The two L-shaped support rods 22 move in opposite directions under the action of the tensioning assembly, thereby tightening the measuring cable 6 wrapped around the two L-shaped support rods 22 to prevent it from coming off.

[0040] Preferably, the tensioning assembly includes a radial guide groove corresponding to the transverse rod on the mounting plate 21, a tensioning block 26 slidably disposed inside the radial guide groove, and a tensioning spring 25 connected between the tensioning block 26 and the inner wall of the radial guide groove; the tensioning block 26 is fixedly connected to the transverse rod; the radial guide grooves of the two L-shaped support rods 22 are located on the same straight line, and the tensioning springs 25 of the two L-shaped support rods 22 are arranged opposite to each other.

[0041] Preferably, the rotating positioning assembly includes a rotating sleeve 23 fixed to the side of the receiving groove near the operation panel 1, and a rotating shaft 24 rotatably disposed inside the rotating sleeve 23. The rotating shaft 24 has a positioning groove, and one side of the positioning groove is connected to the snap connector 27 via a positioning spring 28. The other side of the snap connector 27 extends out of the positioning groove. The inner wall of the rotating sleeve is provided with snap-fit ​​grooves corresponding to the positions of the receiving groove and the operation panel 1, and the snap-fit ​​grooves are adapted to the snap connector 27. The two ends of the rotating shaft 24 pass through the rotating sleeve 23 and are fixedly connected to the mounting plate 21.

[0042] Preferably, the interface on the operation panel 1 includes a DC high-voltage output terminal 11, a current measurement terminal 12, a circuit breaker energy storage circuit wiring terminal 14, and a circuit breaker opening and closing control circuit wiring terminal 13; the DC high-voltage output terminal 11 is electrically connected to the energy storage component via a measurement cable 6, and the energy storage component is also connected in parallel with the surge arrester 4 and the circuit breaker under test 3, respectively, and the circuit breaker under test 3 is connected in series with the Rogowski coil 5; the circuit breaker under test 3 is also electrically connected to the circuit breaker energy storage circuit wiring terminal 14 and the circuit breaker opening and closing control circuit wiring terminal 13 via the measurement cable 6, respectively; the Rogowski coil 5 is also electrically connected to the current measurement terminal 12 via the measurement cable 6; the energy storage component includes an energy storage capacitor and an energy storage inductor.

[0043] It should be noted that the circuit structure and working principle of the measuring mechanism itself are common knowledge in the field, and this application has not made any improvements to them, so they will not be described in detail here.

[0044] Usage procedure: When using, first rotate the cable guide bracket 2 so that the cable guide bracket 2 rotates out of the receiving slot and rotates to the plane where the operation panel 1 is located (that is, the mounting plate 21 of the cable guide bracket 2 and the operation panel 1 are on the same plane). Then, wrap the measuring cable 6 around the outside of the two L-shaped support rods 22 on the cable guide bracket 2, leave some slack, and then insert it into the corresponding interface on the operation panel 1.

[0045] After the measurement is completed, remove the measuring cable 6 from the interface position, wrap it around the cable guide bracket 2, and then rotate the cable guide bracket 2 in the opposite direction to store it in the receiving slot. The structure and operation method are simple and highly practical.

[0046] Therefore, the present invention adopts the above-mentioned stable DC circuit breaker oscillation characteristic measuring device. By setting the wire guide bracket, the remaining part of the measuring cable can be inserted into the corresponding interface position of the operation panel after a part of the measuring cable is wound onto the wire guide bracket, so that the wiring is more stable and does not affect the normal use of the operation panel.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for measuring the oscillation characteristics of a stable DC circuit breaker, comprising a main body consisting of a housing, an operation panel disposed on one side of the housing, and a measuring mechanism disposed inside the housing, characterized in that: A cable guide bracket is movably connected to the side of the outer casing near the control panel, and the cable guide bracket is set to correspond one by one with the interfaces on the control panel. The interface between the cable guide bracket and the operation panel is set horizontally, and the measurement cable between the interface between the cable guide bracket and the operation panel has a certain amount of flexibility. A receiving groove is provided on the side of the outer casing and at the position corresponding to the cable guide bracket. The cable guide bracket is rotatably connected to the receiving groove near the operation panel via a rotation positioning component. Measuring cables are wound around the cable guide bracket; The cable guide bracket includes a mounting plate and two L-shaped support rods symmetrically arranged on the side of the mounting plate away from the outer shell. Measurement cables are wound around the outer sides of the two L-shaped support rods. The L-shaped support rod includes a transverse rod connected to the mounting plate at one end and a longitudinal rod integrally formed with the other end of the transverse rod. The transverse rod is slidably connected to the mounting plate via a tensioning assembly. The two L-shaped support rods move in opposite directions under the action of the tensioning assembly; When using, first rotate the cable guide bracket so that it rotates out of the receiving slot and onto the plane of the operation panel, that is, the mounting plate of the cable guide bracket and the operation panel are on the same plane. Then, wrap the measuring cable around the outside of the two L-shaped support rods on the cable guide bracket, leaving some slack, and then insert it into the corresponding interface on the operation panel. After the measurement is completed, remove the measuring cable from the interface position, wind it out of the cable guide bracket, and then rotate the cable guide bracket in the opposite direction to store it in the receiving slot. The structure and operation method are simple and highly practical.

2. The device for measuring the oscillation characteristics of a stable DC circuit breaker according to claim 1, characterized in that: The tensioning assembly includes a radial guide groove corresponding to the transverse rod on the mounting plate, a tensioning block slidably disposed inside the radial guide groove, and a tensioning spring connecting the tensioning block and the inner wall of the radial guide groove; The tensioning block is fixedly connected to the transverse rod; The radial guide grooves of the two L-shaped support rods are located on the same straight line, and the tension springs of the two L-shaped support rods are arranged opposite each other.

3. The device for measuring the oscillation characteristics of a stable DC circuit breaker according to claim 1, characterized in that: The rotating positioning assembly includes a rotating sleeve fixed to the side of the receiving groove near the operation panel, and a rotating shaft rotatably disposed inside the rotating sleeve. A positioning groove is provided on the rotating shaft. One side of the locking connector is connected to the positioning groove via a positioning spring. The other side of the locking connector extends out of the positioning groove. The inner wall of the rotating sleeve is provided with locking grooves corresponding to the positions of the receiving groove and the operation panel, respectively. The locking grooves are adapted to the locking connectors. The two ends of the rotating shaft pass through the rotating sleeve and are fixedly connected to the mounting plate.

4. The device for measuring the oscillation characteristics of a stable DC circuit breaker according to claim 1, characterized in that: The interfaces on the control panel include DC high voltage output terminals, current measurement terminals, circuit breaker energy storage circuit wiring terminals, and circuit breaker opening and closing control circuit wiring terminals. The DC high voltage output terminal is electrically connected to the energy storage component via a measuring cable. The energy storage component is also connected in parallel with the surge arrester and the circuit breaker under test, and the circuit breaker under test is connected in series with the Rogowski coil. The circuit breaker under test is also electrically connected to the circuit breaker energy storage circuit terminals and the circuit breaker opening and closing control circuit terminals via measuring cables. The Rogowski coil is also electrically connected to the current measuring terminal via a measuring cable; Energy storage components include energy storage capacitors and energy storage inductors.

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