Circuit breaker pole part
By designing laterally open channels or pipes on the end surfaces of the circuit breaker electrode components and casings, natural convection cooling is achieved, and the problem of difficulty in cooling when high current is passed in the prior art is solved, thereby achieving efficient heat absorption and improving current load capacity.
Patent Information
- Application Number
- CN202411737615.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-29
- Filing Date
- 2024-11-29
- Publication Date
- 2025-05-30
AI Technical Summary
The existing circuit breaker pole components and casing are difficult to cool effectively when high current passes, resulting in failure at the connection and failing to meet the temperature rise requirements of IEC62271-100 standard.
A laterally open channel or duct is designed in the terminals and end faces of the circuit breaker pole components, allowing air to cool the terminals and sleeves through the natural convection. This design is achieved by drilling or groove planing, and the width and direction of the channels can be varied to enhance air turbulence and heat absorption.
Through natural convection cooling, heat from terminals and sleeves is effectively absorbed, the service life of the equipment is extended, cooling requirements under high current loads, and the overall size and dielectric performance of the circuit breaker are maintained.
Smart Images
Figure CN120072583A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a breaker pole component, a bushing for a breaker pole component, and a breaker system. Background Art
[0002] In low, medium, and high voltage applications, bushings are used to connect to the terminals of breaker pole components, and due to the current passing through these connections, the temperature will increase due to Joule heating, and at the joints where the bushings are connected to the terminals, due to the increased resistance associated with the connections, elevated temperatures will be generated.
[0003] This will ultimately lead to failure at the connections.
[0004] Moreover, the allowable temperature rise without forced cooling must meet the requirements of the IEC62271-100 standard.
[0005] This is difficult to achieve. Summary of the Invention
[0006] Therefore, it would be advantageous to have an improved ability to absorb heat energy from a switchgear breaker pole component, particularly at the joint between the terminal of the breaker pole component and the bushing connected to that terminal.
[0007] The object of the present invention is solved by the subject matter of the independent claims, with further embodiments incorporated in the dependent claims.
[0008] In a first aspect, there is provided a breaker pole component (10) comprising:
[0009] - a first terminal (20);
[0010] - a second terminal (30).
[0011] The breaker pole component includes a stationary contact and a moving contact. The first terminal is electrically connected to either the stationary contact or the moving contact. The second terminal is electrically connected to the stationary contact or the moving contact that is not electrically connected to the first terminal;
[0012] wherein the first terminal includes at least one duct or at least one channel (60); and
[0013] wherein the at least one duct or the at least one channel includes a first open end located at one end of the at least one duct or the at least one channel and a second open end located at the opposite end of the at least one duct or the at least one channel, such that air can enter the at least one duct or the at least one channel via the first open end, flow through the at least one duct or the at least one channel, and exit the at least one duct or the at least one channel via the second open end.
[0014] Thus, air can flow through or across the surface of the first terminal to cool it. When the at least one duct or the at least one channel is inclined at any angle from the horizontal direction, the air within one or more ducts / channels is heated, rises, and exits one or more ducts / channels at the upper end, such that cold air is drawn into the lower end of one or more ducts / channels, causing cold air to continuously flow into one or more ducts / channels, which is heated and exits one or more ducts / channels, thus absorbing heat from the first terminal to cool it. This is achieved via natural convection and does not require devices such as fans to move the air. Thus, the cooling of the first terminal of the circuit breaker pole component is achieved in a simple manner without moving parts.
[0015] Thus, a conventional circuit breaker pole component having a first terminal electrically connected to the stationary contact (e.g., of a vacuum circuit breaker) and a second terminal electrically connected to the moving contact of the circuit breaker has been modified to allow cooling of these terminals via natural convection.
[0016] In one example, the at least one duct or the at least one channel is at least one duct, and the at least one duct between the first open end and the second open end has a sidewall surface formed only by the first terminal.
[0017] In other words, the duct is a bounded hole passing through the first terminal, which can be drilled through the first terminal.
[0018] Thus, existing circuit breaker poles can be modified by drilling through the terminal(s) to provide air convection cooling.
[0019] In one example, the at least one duct or the at least one channel is at least one channel in the end face (40) of the first terminal.
[0020] In other words, the at least one channel is a laterally open channel in the end face of the first terminal. When a bushing is connected to the first terminal to provide electrical connection to the first terminal, the at least one boundary becomes at least one duct, one side of which is bounded by the first terminal and the other side is bounded by the bushing, but has open ends that allow cooling air to flow through the formed duct(s) and cool the first terminal as well as the bushing.
[0021] Channels can be machined in the terminal surface, for example, by slot planing, and existing circuit breaker poles can be modified for cooling.
[0022] In one example, between the first open end and the second open end of one or more channels in the at least one channel, the width of one or more channels in the at least one channel is variable.
[0023] In one example, between a first open end and a second open end of one or more channels in at least one channel, the direction of the one or more channels in the at least one channel varies.
[0024] In this way, the degree of interaction between the air flowing through the channel and the channel sidewalls is increased, thereby providing enhanced heat absorption. This is achieved by having the channel with a varying width and / or having bends in the channel, which results in a certain degree of air turbulence, and compared to a straight channel with straight and parallel sidewalls, the air interacts more with the channel, and the air leaving the channel has a greater temperature difference relative to the air entering the channel.
[0025] The width of the channel can be changed via, for example, a rabbet plane. The direction of the channel can be changed via, for example, a rabbet plane.
[0026] In one example, the sleeve (80) is configured to be connected to the first terminal, where the end face (90) of the sleeve contacts the end face of the first terminal. When the sleeve is connected to the first terminal, air can enter the at least one channel via the first open end, flow through the at least one channel, and leave the at least one channel via the second open end.
[0027] Thus, the laterally open channel becomes a duct with openings at both ends, enabling air to flow through it and cool the terminal and the sleeve.
[0028] In one example, the second terminal includes at least one duct or at least one channel (70). The at least one duct or at least one channel of the second terminal includes a first open end and a second open end such that air can enter the at least one duct or the at least one channel via the first open end of the at least one duct or at least one channel of the second terminal, flow through the at least one duct or the at least one channel, and leave the at least one duct or the at least one channel via the second open end of the at least one duct or at least one channel of the second terminal.
[0029] In one example, the at least one duct or at least one channel of the second terminal is the at least one duct of the second terminal, wherein the at least one duct of the second terminal between the first open end and the second open end has a sidewall surface formed only by the second terminal.
[0030] In one example, the at least one duct or at least one channel of the second terminal is the at least one channel of the second terminal in the end face (50) of the second terminal.
[0031] In one example, between a first open end and a second open end of one or more channels in the at least one channel of the second terminal, the width of the one or more channels in the at least one channel of the second terminal varies.
[0032] In one example, between a first open end and a second open end of one or more channels in at least one channel of the second terminal, the direction of one or more channels in at least one channel of the second terminal varies.
[0033] In one example, the bushing (80) is configured to be connected to the second terminal such that an end face (90) of the bushing contacts an end face of the second terminal (except for the location where at least one channel of the second terminal is located).
[0034] In one example, in use, the breaker pole component is configured to be positioned in a substantially vertical orientation.
[0035] In one example, in use, at least one duct or at least one channel in the first terminal is configured to be in a substantially vertical orientation.
[0036] In one example, in use, at least one duct or at least one channel in the second terminal is configured to be in a substantially vertical orientation.
[0037] In a second aspect, there is provided a bushing (80) for a breaker pole component (10). The breaker pole component includes a first terminal (20) and a second terminal (30). The breaker pole component further includes:
[0038] - a stationary contact; and
[0039] - a moving contact.
[0040] The first terminal is electrically connected to the stationary contact or the moving contact, and the second terminal is electrically connected to the stationary contact or the moving contact that is not electrically connected to the first terminal. The first terminal includes an end face (40), and the second terminal includes an end face (50). The bushing includes:
[0041] - at least one duct or at least one channel (100); and
[0042] - an end face (90).
[0043] At least one duct or at least one channel of the bushing includes a first open end located at one end of the at least one duct or the at least one channel and a second open end located at an opposite end of the at least one duct or the at least one channel, such that air can enter the at least one duct or at least one channel of the bushing via the first open end, flow through the at least one duct or at least one channel of the bushing, and exit the at least one duct or at least one channel of the bushing via the second open end. The end face (90) of the bushing is configured to be connected to the end face of the first terminal of the breaker pole component and / or the end face of the second terminal of the breaker pole component.
[0044] Accordingly, air can flow through or across the surface of the bushing to cool the bushing. When the at least one duct or the at least one channel is inclined at any degree from the horizontal direction, when the bushing is connected to the terminal of the breaker pole component, the air in one or more ducts / channels is heated, rises, and exits the one or more ducts / channels at the upper end, so that cold air is drawn into the lower end of the one or more ducts / channels, resulting in continuous inflow of cold air into the one or more ducts / channels, which is heated and exits the one or more ducts / channels, thus absorbing heat from the bushing to cool the bushing, and this also cools the first terminal. This is achieved via natural convection without the need for devices such as fans to move the air. Thus, the cooling of the first terminal of the breaker pole component is achieved in a simple manner without the need for moving parts.
[0045] In one example, the at least one duct or the at least one channel of the bushing is at least one duct, and the at least one duct of the bushing located between the first open end and the second open end has a sidewall surface formed only by the bushing.
[0046] In other words, the duct is a bounded hole through the bushing, which can be obtained by drilling through the bushing.
[0047] Therefore, existing bushings can be retrofitted by drilling through the bushings to provide air convection cooling.
[0048] In one example, the at least one duct or the at least one channel of the bushing is at least one channel in the end face (90) of the bushing.
[0049] In other words, the at least one channel is a laterally open channel in the end face of the bushing. When the bushing is connected to the terminal of the breaker pole to provide electrical connection to the terminal, the at least one boundary becomes at least one duct, one side of which is bounded by the terminal and the other side is bounded by the bushing, but has open ends that allow cooling air to flow through the formed duct and cool the bushing and the terminal.
[0050] The channels in the bushing surface can be formed, for example, by slot planing, and the bushing can be retrofitted for cooling.
[0051] In one example, between the first open end and the second open end of one or more channels in the at least one channel of the bushing, the width of one or more channels in the at least one channel of the bushing is variable.
[0052] In one example, between the first open end and the second open end of one or more channels in the at least one channel of the bushing, the direction of one or more channels in the at least one channel of the bushing is variable.
[0053] In this way, the degree of interaction between the air flowing through the channel and the side walls of the channel is increased, thereby providing enhanced heat absorption. This is achieved by making the channel have a varying width and / or having bends in the channel, which results in a certain degree of air turbulence, and compared with a straight channel having straight and parallel side walls, the air interacts with the channel to a greater extent, and the air leaving the channel has a greater temperature difference relative to the air entering the channel.
[0054] The width of the channel can be changed via, for example, a router plane. The direction of the channel can be changed via, for example, a router plane.
[0055] In one example, the end face of the bushing is configured to be connected to the end face of the first terminal, where the end face (90) of the bushing contacts the end face of the first terminal, and air can enter at least one channel of the bushing via the first open end, flow through at least one channel of the bushing, and leave at least one channel of the bushing via the second open end.
[0056] In one example, the end face of the bushing is configured to be connected to the end face of the second terminal, where the end face (90) of the bushing contacts the end face of the second terminal, and air can enter at least one channel of the bushing via the first open end, flow through at least one channel of the bushing, and leave at least one channel of the bushing via the second open end.
[0057] Therefore, since the surface of the first terminal closes the open side of the laterally open channel, the laterally open channel becomes a duct with openings at each end, enabling air to flow through it and cool the terminal(s) of the breaker pole component and also cool the bushing.
[0058] In one example, in use, at least one channel of the bushing is configured to be in a substantially vertical orientation.
[0059] In a third aspect, there is provided a circuit breaker system comprising:
[0060] - a breaker pole component (10); and
[0061] - a bushing (80).
[0062] The bushing is configured to be connected to the breaker pole component. The breaker pole component includes a first terminal (20) and a second terminal (30).
[0063] The breaker pole component includes a stationary contact and a moving contact.
[0064] The first terminal is electrically connected to the static contact or the moving contact, and the second terminal is electrically connected to the static contact or the moving contact that is not electrically connected to the first terminal. The first terminal includes an end face (40). The first terminal includes at least one channel (60) located in the end face of the first terminal. At least one channel of the first terminal includes a first open end at one end of the at least one channel and a second open end at the opposite end of the at least one channel, such that air can enter the at least one channel of the first terminal via the first open end, flow through the at least one channel of the first terminal, and leave the at least one channel of the first terminal via the second open end.
[0065] The bushing includes an end face (90). The bushing further includes at least one channel (100) in the end face of the bushing. At least one channel of the bushing includes a first open end at one end of the at least one channel and a second open end at the opposite end of the at least one channel, such that air can enter the at least one channel of the bushing via the first open end, flow through the at least one channel of the bushing, and leave the at least one channel of the bushing via the second open end. The end face of the bushing is configured to be connected to the end face of the first terminal. When the end face of the bushing is connected to the end face of the first terminal, air can flow through at least one channel of the bushing, and air can flow through at least one channel of the first terminal.
[0066] Thus, air can flow through or across the surface of the bushing to cool the bushing, and air can flow through or across the surface of the first terminal to cool it. When at least one duct or at least one channel of the first terminal and the bushing is inclined at any degree from the horizontal direction, when the bushing is connected to the terminal of the breaker pole component, the air in one or more ducts / channels is heated, rises, and leaves one or more ducts / channels at the upper end, so that cold air is sucked into the lower end of one or more ducts / channels, resulting in continuous inflow of cold air into one or more ducts / channels, which is heated and leaves one or more ducts / channels, thus absorbing heat from the first terminal and the bushing to cool them. This is achieved via natural convection without the need for devices such as fans to move the air. Thus, the cooling of the first terminal of the breaker pole component and the bushing connected thereto is achieved in a simple manner without moving parts.
[0067] When the surface of the first terminal has one or more channels and the surface of the sleeve has one or more channels, and these surfaces mate together when the sleeve is connected to the first terminal, the first terminal and the sleeve can be designed such that the channels are aligned - thereby forming ducts equal in number to half the total number of channels in the first terminal and the sleeve. This provides a design in which the ducts formed can be large, and good electrical conduction between the sleeve and the terminal is maintained due to the maximization of the amount of mating surfaces, while providing convective air cooling. However, the channels do not have to be aligned, for example, the ducts are formed by the channels on one side and the flat surfaces of the mating surfaces on the other side. Thus, the number of ducts formed can be equal to the total number of channels in the sleeve and the terminal. This provides a design in which cooling can be provided over the maximum surface area at the end of the sleeve and over the maximum surface area at the end of the terminal, thereby overall enhancing the cooling effect via natural air convection.
[0068] In one example, between a first open end and a second open end of one or more channels in at least one channel of the first terminal, the width of one or more channels in at least one channel of the first terminal varies.
[0069] In one example, between a first open end and a second open end of one or more channels in at least one channel of the first terminal, the direction of one or more channels in at least one channel of the first terminal varies.
[0070] In one example, between a first open end and a second open end of one or more channels in at least one channel of the sleeve, the width of one or more channels in at least one channel of the sleeve varies.
[0071] In one example, between a first open end and a second open end of one or more channels in at least one channel of the sleeve, the direction of one or more channels in at least one channel of the sleeve varies.
[0072] In one example, when the sleeve is connected to the breaker pole component, at least one channel of the sleeve is configured to be aligned with at least one channel of the first terminal.
[0073] In one example, the system includes a second sleeve. The second sleeve includes an end face (90). The second sleeve also includes at least one channel (100) located in the end face of the second sleeve. At least one channel of the second sleeve includes a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, such that air can enter the at least one channel of the second sleeve via the first open end, flow through the at least one channel of the second sleeve, and exit the at least one channel of the second sleeve via the second open end. The second terminal includes an end face (50). The second terminal also includes at least one channel (70) located in the end face of the second terminal. At least one channel of the second terminal includes a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, such that air can enter the at least one channel of the second terminal via the first open end, flow through the at least one channel of the second terminal, and exit the at least one channel of the second terminal via the second open end. The end face of the second sleeve is configured to be connected to the end face of the second terminal. When the end face of the second sleeve is connected to the end face of the second terminal, air can flow through at least one channel of the second sleeve and air can flow through at least one channel of the second terminal.
[0074] The second sleeve may be the same as the first sleeve (the "first sleeve" is referred to as the "sleeve" above).
[0075] In one example, when the second sleeve is connected to the breaker pole component, at least one channel of the second sleeve is configured to be aligned with at least one channel of the second terminal.
[0076] In one example, in use, the breaker pole component is configured to be positioned in a substantially vertical orientation.
[0077] In one example, in use, at least one channel of the first terminal is configured to be in a substantially vertical orientation.
[0078] In one example, in use, at least one channel of the second terminal is configured to be in a substantially vertical orientation.
[0079] In one example, in use, at least one channel of the sleeve is configured to be in a substantially vertical orientation.
[0080] In one example, in use, at least one channel of the second sleeve is configured to be in a substantially vertical orientation.
[0081] The above aspects and examples will become apparent and be elucidated with reference to the embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS
[0082] Exemplary embodiments will be described below with reference to the following drawings:
[0083] Figure 1 A schematic diagram showing an example of a breaker pole component;
[0084] Figure 2 Shows Figure 1 an isometric schematic diagram of the breaker pole component;
[0085] Figure 3 A schematic diagram showing an example of a bushing for a terminal that can be connected to a breaker pole;
[0086] Figure 4 Shows Figure 3 the isometric schematic diagram of the bushing; and
[0087] Figure 5 Shows an isometric schematic diagram of a breaker system having a breaker pole component as shown in Figure 1-2 and two bushings as shown in Figure 3-4 connected to two terminals. DETAILED DESCRIPTION
[0088] Figure 1-5 Relates to a novel breaker pole component, a novel bushing for a breaker pole component, and a novel breaker system.
[0089] It should be noted that in Figure 1-2 , the end faces 40, 50 of the terminals 20, 30 of the breaker pole component are shown to have channels 60, 70 in these surfaces. However, alternatively or additionally, conduits in other bounded holes can be provided behind those surfaces (e.g., already drilled).
[0090] It should be noted that in Figure 3-4 , the end face 90 of the bushing 80 is shown to have a channel 100 on the surface. However, alternatively or additionally, conduits in other bounded holes can be provided behind those surfaces (e.g., already drilled).
[0091] An exemplary novel breaker pole component 10 includes:
[0092] - A first terminal 20; and
[0093] - A second terminal 30.
[0094] The breaker pole component includes a stationary contact and a moving contact. A first terminal is electrically connected to either the stationary contact or the moving contact. A second terminal is electrically connected to the stationary contact or the moving contact that is the contact not electrically connected to the first terminal. The first terminal includes at least one duct or at least one passage 60. The at least one duct or the at least one passage includes a first open end located at one end of the at least one duct or the at least one passage and a second open end located at the other end of the at least one duct or the at least one passage, such that air can enter the at least one duct or the at least one passage via the first open end, flow through the at least one duct or the at least one passage, and leave the at least one duct or the at least one passage via the second open end.
[0095] Thus, air can flow through or across the surface of the first terminal to cool it. When the at least one duct or the at least one passage is inclined at any angle from the horizontal direction, the air in one or more ducts / passages is heated, rises, and leaves the one or more ducts / passages at the upper end, so that cold air is drawn into the lower end of the one or more ducts / passages, resulting in continuous inflow of cold air into the one or more ducts / passages, which is heated and leaves the one or more ducts / passages, thus absorbing heat from the first terminal to cool the first terminal. This is achieved via natural convection and does not require devices such as fans to move the air. Thus, the cooling of the first terminal of the breaker pole component is achieved in a simple manner without moving parts.
[0096] Therefore, a conventional breaker pole component having a first terminal electrically connected to the stationary contact (such as of a vacuum breaker) and a second terminal electrically connected to the moving contact of the breaker has been modified to allow cooling of these terminals via natural convection.
[0097] In one example, the at least one duct or the at least one passage is at least one duct, and the at least one duct between the first open end and the second open end has a sidewall surface formed only by the first terminal.
[0098] In other words, the duct is a bounded hole passing through the first terminal, which can be drilled through the first terminal.
[0099] Therefore, an existing breaker pole can be modified by drilling through the terminal(s) to provide air convection cooling.
[0100] In one example, the at least one duct or the at least one passage is at least one passage in the end face 40 of the first terminal.
[0101] In other words, the at least one channel is a laterally open channel in the end face of the first terminal. When the sleeve is connected to the first terminal to provide an electrical connection with the first terminal, the at least one boundary becomes at least one duct, one side of which is bounded by the first terminal and the other side by the sleeve, but having an open end that allows cooling air to flow through the formed duct (or ducts) and cool the first terminal and the sleeve.
[0102] The channels in the terminal surface can be machined, for example, via a slot planer, and existing breaker poles can be retrofitted for cooling.
[0103] In one example, between a first open end and a second open end of one or more of the at least one channel, the width of one or more of the at least one channel varies.
[0104] In one example, between a first open end and a second open end of one or more of the at least one channel, the direction of one or more of the at least one channel varies.
[0105] In this way, the degree of interaction between the air flowing through the channel and the channel sidewalls is increased, thereby providing enhanced heat absorption. This is achieved by having the channel with a varying width and / or having bends in the channel, which results in a certain degree of air turbulence, and compared to a straight channel with straight and parallel sidewalls, the air interacts more with the channel, and the air leaving the channel has a greater temperature difference relative to the air entering the channel.
[0106] The width of the channel can be changed, for example, via a slot planer. The direction of the channel can be changed, for example, via a slot planer.
[0107] In one example, the sleeve 80 is configured to be connected to the first terminal, where the end face 90 of the sleeve contacts the end face of the first terminal. When the sleeve is connected to the first terminal, air can enter the at least one channel via the first open end, flow through the at least one channel, and leave the at least one channel via the second open end.
[0108] Thus, the laterally open channel becomes a duct with openings at both ends, enabling air to flow through it and cool the terminal and the sleeve.
[0109] In one example, the second terminal includes at least one duct or at least one channel 70. The at least one duct or at least one channel of the second terminal includes a first open end and a second open end such that air can enter the at least one duct or the at least one channel via the first open end of the at least one duct or at least one channel of the second terminal, flow through the at least one duct or the at least one channel, and exit the at least one duct or the at least one channel via the second open end of the at least one duct or at least one channel of the second terminal.
[0110] In one example, the at least one duct or at least one channel of the second terminal is the at least one duct of the second terminal, wherein the at least one duct of the second terminal between the first open end and the second open end has a sidewall surface formed only by the second terminal.
[0111] In one example, the at least one duct or at least one channel of the second terminal is the at least one channel of the second terminal in the end face 50 of the second terminal.
[0112] In one example, the width of one or more channels in the at least one channel of the second terminal varies between the first open end and the second open end of the one or more channels in the at least one channel of the second terminal.
[0113] In one example, the direction of one or more channels in the at least one channel of the second terminal varies between the first open end and the second open end of the one or more channels in the at least one channel of the second terminal.
[0114] In one example, the sleeve 80 is configured to be connected to the second terminal such that the end face 90 of the sleeve contacts the end face of the second terminal (except for the location where the at least one channel of the second terminal is located).
[0115] In one example, in use, the circuit breaker pole component is configured to be positioned in a substantially vertical orientation.
[0116] In one example, in use, the at least one duct or at least one channel in the first terminal is configured to be in a substantially vertical orientation.
[0117] In one example, in use, the at least one duct or at least one channel in the second terminal is configured to be in a substantially vertical orientation.
[0118] Now, an exemplary novel bushing 80 for a circuit breaker pole component 10 is described. The circuit breaker pole component includes a first terminal 20 and a second terminal 30. The circuit breaker pole component further includes a stationary contact and a moving contact. The first terminal is electrically connected to either the stationary contact or the moving contact, and the second terminal is electrically connected to the stationary contact or the moving contact that is not electrically connected to the first terminal. The first terminal includes an end face 40, and the second terminal includes an end face 50. The bushing includes at least one duct or at least one passage 100 and an end face 90. The at least one duct or at least one passage of the bushing includes a first open end located at one end of the at least one duct or at least one passage and a second open end located at the opposite end of the at least one duct or at least one passage, such that air can enter the at least one duct or at least one passage of the bushing via the first open end, flow through the at least one duct or at least one passage of the bushing, and exit the at least one duct or at least one passage of the bushing via the second open end. The end face 90 of the bushing is configured to be connected to the end face of the first terminal of the circuit breaker pole component and / or the end face of the second terminal of the circuit breaker pole component.
[0119] Thus, air can flow through or across the surface of the bushing to cool the bushing. When the at least one duct or the at least one passage is inclined at any degree from the horizontal direction, when the bushing is connected to the terminals of the circuit breaker pole component, the air in one or more ducts / passages is heated, rises, and exits one or more ducts / passages at the upper end, so that cold air is drawn into the lower end of one or more ducts / passages, resulting in continuous inflow of cold air into one or more ducts / passages, which is heated and exits one or more ducts / passages, thus absorbing heat from the bushing to cool the bushing, and this also cools the first terminal. This is achieved via natural convection and does not require a device such as a fan to move the air. Thus, the cooling of the first terminal of the circuit breaker pole component is achieved in a simple manner without moving parts.
[0120] In one example, the at least one duct or at least one passage of the bushing is at least one duct, and the at least one duct of the bushing located between the first open end and the second open end has a side wall surface formed only by the bushing.
[0121] In other words, the duct is a bounded hole through the bushing, which can be obtained by drilling through the bushing.
[0122] Therefore, an existing bushing can be modified by drilling through the bushing to provide air convection cooling.
[0123] In one example, the at least one duct or at least one passage of the bushing is at least one passage in the bushing end face 90.
[0124] In other words, the at least one channel is a laterally open channel in the end face of the bushing. When the bushing is connected to the terminal of the breaker pole to provide electrical connection to the terminal, the at least one boundary becomes at least one duct, one side of which is bounded by the terminal and the other side by the bushing, but having open ends that allow cooling air to flow through the one or more ducts formed and cool the bushing and the terminal.
[0125] The channels in the bushing surface can be machined, for example, by slotting, and the bushing can be modified for cooling.
[0126] In one example, between the first and second open ends of one or more channels in at least one channel of the bushing, the width of one or more channels in at least one channel of the bushing varies.
[0127] In one example, between the first and second open ends of one or more channels in at least one channel of the bushing, the direction of one or more channels in at least one channel of the bushing varies.
[0128] In this way, the degree of interaction between the air flowing through the channel and the channel sidewalls is increased, thereby providing enhanced heat absorption. This is achieved by having channels with varying widths and / or having bends in the channels, which results in a certain degree of air turbulence and a greater degree of interaction between the air and the channels compared to straight channels with straight and parallel sidewalls, and the air leaving the channel has a greater temperature difference relative to the air entering the channel.
[0129] The width of the channel can be changed, for example, by slotting. The direction of the channel can be changed, for example, by slotting.
[0130] In one example, the end face of the bushing is configured to be connected to the end face of a first terminal, where the end face of the bushing contacts the end face of the first terminal at 90 degrees, and air can enter at least one channel of the bushing through the first open end, flow through at least one channel of the bushing, and leave at least one channel of the bushing through the second open end.
[0131] In one example, the end face of the bushing is configured to be connected to the end face of a second terminal, where the end face of the bushing contacts the end face of the second terminal at 90 degrees, and air can enter at least one channel of the bushing through the first open end, flow through at least one channel of the bushing, and leave at least one channel of the bushing through the second open end.
[0132] Thus, since the surface of the first terminal closes the open side of the laterally open channel, the laterally open channel becomes a duct with openings at each end, such that air can flow through the openings and cool the terminal(s) of the breaker pole component and also cool the bushing.
[0133] In one example, in use, at least one passage of the bushing is configured to be in a substantially vertical orientation.
[0134] An exemplary new circuit breaker system includes:
[0135] - a circuit breaker pole component 10; and
[0136] - a bushing 80.
[0137] The bushing is configured to be connected to the circuit breaker pole component. The circuit breaker pole component includes a first terminal 20 and a second terminal 30.
[0138] The circuit breaker pole component includes a stationary contact and a moving contact.
[0139] The first terminal is electrically connected to either the stationary contact or the moving contact, and the second terminal is electrically connected to the stationary contact or the moving contact that is not electrically connected to the first terminal. The first terminal includes an end face 40. The first terminal includes at least one passage 60 located in the end face of the first terminal. At least one passage of the first terminal includes a first open end at one end of the at least one passage and a second open end at the opposite end of the at least one passage, such that air can enter the at least one passage of the first terminal via the first open end, flow through the at least one passage of the first terminal, and exit the at least one passage of the first terminal via the second open end.
[0140] The bushing includes an end face 90. The bushing further includes at least one passage 100 in the end face of the bushing. At least one passage of the bushing includes a first open end at one end of the at least one passage and a second open end at the opposite end of the at least one passage, such that air can enter the at least one passage of the bushing via the first open end, flow through the at least one passage of the bushing, and exit the at least one passage of the bushing via the second open end. The end face of the bushing is configured to be connected to the end face of the first terminal. When the end face of the bushing is connected to the end face of the first terminal, air can flow through at least one passage of the bushing, and air can flow through at least one passage of the first terminal.
[0141] Thus, air can flow through or across the surface of the bushing to cool the bushing, and air can flow through or across the surface of the first terminal to cool it. When at least one duct or at least one channel of the first terminal and the bushing is inclined at any degree from the horizontal direction, when the bushing is connected to the terminal of the breaker pole component, the air in one or more ducts / channels is heated, rises, and exits one or more ducts / channels at the upper end, so that cold air is drawn into the lower end of one or more ducts / channels, resulting in continuous inflow of cold air into one or more ducts / channels, which is heated and exits one or more ducts / channels, thus absorbing heat from the first terminal and the bushing to cool them. This is achieved via natural convection without the need for devices such as fans to move the air. Thus, the cooling of the first terminal of the breaker pole component and the bushing connected thereto is achieved in a simple manner without moving parts.
[0142] When the surface of the first terminal has one or more channels and the surface of the bushing has one or more channels, and these surfaces mate together when the bushing is connected to the first terminal, the first terminal and the bushing can be designed such that the channels are aligned - thus forming ducts with a number equal to half of the total number of channels in the first terminal and the bushing. This provides a design in which the formed ducts can be large, and good electrical conduction between the bushing and the terminal is maintained due to the maximization of the amount of mating surfaces, while providing convective air cooling. However, the channels do not have to be aligned, for example, the ducts are formed by the channels on one side and the flat surfaces of the mating surfaces on the other side. Thus, the number of formed ducts can be equal to the total number of channels in the bushing and the terminal. This provides a design in which cooling can be provided on the maximum surface area at the end of the bushing and on the maximum surface area at the end of the terminal, thus overall enhancing the cooling effect via natural air convection.
[0143] In one example, between the first open end and the second open end of one or more channels in at least one channel of the first terminal, the width of one or more channels in at least one channel of the first terminal varies.
[0144] In one example, between the first open end and the second open end of one or more channels in at least one channel of the first terminal, the direction of one or more channels in at least one channel of the first terminal varies.
[0145] In one example, between the first open end and the second open end of one or more channels in at least one channel of the bushing, the width of one or more channels in at least one channel of the bushing varies.
[0146] In one example, between a first open end and a second open end of one or more channels in at least one channel of the bushing, the direction of one or more channels in at least one channel of the bushing varies.
[0147] In one example, when the bushing is connected to a breaker pole component, at least one channel of the bushing is configured to align with at least one channel of the first terminal.
[0148] In one example, the system includes a second bushing. The second bushing includes an end face 90. The second bushing further includes at least one channel 100 in the end face of the second bushing. At least one channel of the second bushing includes a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, such that air can enter at least one channel of the second bushing via the first open end, flow through at least one channel of the second bushing, and exit at least one channel of the second bushing via the second open end. The second terminal includes an end face 50. The second terminal further includes at least one channel 70 in the end face of the second terminal. At least one channel of the second terminal includes a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, such that air can enter at least one channel of the second terminal via the first open end, flow through at least one channel of the second terminal, and exit at least one channel of the second terminal via the second open end. The end face of the second bushing is configured to connect to the end face of the second terminal. When the end face of the second bushing is connected to the end face of the second terminal, air can flow through at least one channel of the second bushing and air can flow through at least one channel of the second terminal.
[0149] The second bushing may be the same as the first bushing (the "first bushing" is referred to as the "bushing" above).
[0150] In one example, when the second bushing is connected to a breaker pole component, at least one channel of the second bushing is configured to align with at least one channel of the second terminal.
[0151] In one example, in use, the breaker pole component is configured to be positioned in a substantially vertical orientation.
[0152] In one example, in use, at least one channel of the first terminal is configured to be in a substantially vertical orientation.
[0153] In one example, in use, at least one channel of the second terminal is configured to be in a substantially vertical orientation.
[0154] In one example, in use, at least one channel of the bushing is configured to be in a substantially vertical orientation.
[0155] In one example, in use, at least one channel of the second sleeve is configured to be in a substantially vertical orientation.
[0156] Accordingly, the inventors realized that it is actually possible to retrofit existing breaker pole components and the existing sleeves of the terminals connected to the breaker pole components to provide cooling at or near the connection point between the sleeve and the terminal connected thereto. This is achieved by providing laterally open channels in the end faces of the terminals of the pole components and / or the sleeves, enabling air to convect through the holes to provide cooling at the interface. Alternatively or additionally, holes can be drilled through the terminals and / or the sleeves - at a location close to where the connection is to be made - also enabling air to flow through the holes by convection to provide cooling.
[0157] The new design of the terminal / sleeve allows a large amount of fresh air to naturally flow through the connection area by convection, thus greatly contributing to the removal of the heat generated when a large current passes through.
[0158] The new terminal / sleeve design can increase the heat dissipation surface around the entire system, thus maintaining and ensuring the contact between the two surfaces through which the current passes.
[0159] The special channel (groove) geometry and vertical orientation (introduced on both surfaces) are conducive to the effectiveness of natural ventilation, which allows more heat to be removed in the same unit of time, thus improving the heat dissipation efficiency.
[0160] Therefore, for low-voltage, medium-voltage or high-voltage circuit breakers, the switching elements and their terminals are part of the main circuit and must be cooled due to the ohmic losses at the nominal current. This cooling makes it necessary to conduct the heat losses to the surrounding air. The new design of the terminals of the breaker pole components and the sleeves connected to these terminals allows cold air to flow through the connection area and absorb heat from the terminals.
[0161] The advantage of this new design is that the overall size of the circuit breaker will remain unchanged, it has no impact from a dielectric perspective, and it provides cooling, thus being able to meet the required standards and increase the current load to be utilized because improved cooling is provided.
[0162] In summary, the device improves the thermal performance of the pole components and the sleeves and achieves a higher level in a natural way.
[0163] Reference Numerals
[0164] 10 Breaker pole component
[0165] 20 First terminal of the breaker pole component
[0166] 30 Second terminal of the breaker pole component
[0167] 40 End face of the first terminal of the breaker pole component
[0168] End face of the second terminal of the 50 breaker pole component
[0169] Channel or duct in the first terminal of the 60 breaker pole component
[0170] Channel or duct in the second terminal of the 70 breaker pole component
[0171] 80 Bushing
[0172] End face of the 90 bushing
[0173] Channel or duct in the 100 bushing
[0174] Although the present invention has been illustrated and described in detail in the drawings and the foregoing description, such illustrations and descriptions shall be regarded as illustrative or exemplary and not restrictive. The present invention is not limited to the disclosed embodiments. Those skilled in the art, when practicing the claimed invention, can understand and realize other variations of the disclosed embodiments by studying the drawings, the disclosure, and the dependent claims.
Claims
1. A circuit breaker pole component (10), comprising: - a first terminal (20); - a second terminal (30); wherein the circuit breaker pole component comprises a stationary contact and a moving contact, wherein the first terminal is electrically connected to the stationary contact or the moving contact, and wherein the second terminal is electrically connected to the stationary contact or the moving contact as a contact not electrically connected to the first terminal; wherein the first terminal comprises at least one pipe or at least one channel (60); and Wherein, the at least one pipe or the at least one channel comprises a first open end located at one end of the at least one pipe or the at least one channel and a second open end located at the opposite end of the at least one pipe or the at least one channel, so that air can enter the at least one pipe or the at least one channel via the first open end, flow through the at least one pipe or the at least one channel, and leave the at least one pipe or the at least one channel via the second open end.
2. The circuit breaker pole member according to claim 1, wherein: The at least one pipe or the at least one channel is at least one pipe, and wherein the at least one pipe between the first open end and the second open end has a side wall surface formed only by the first terminal.
3. The circuit breaker pole member according to claim 1, wherein: The at least one conduit or at least one channel is at least one channel in an end face (40) of the first terminal.
4. The circuit breaker pole member according to claim 3, wherein: The width of the one or more channels in the at least one channel varies between a first open end and a second open end of the one or more channels in the at least one channel, and / or the direction of the one or more channels in the at least one channel varies between a first open end and a second open end of the one or more channels in the at least one channel.
5. A circuit breaker pole component according to any one of claims 3 to 4, wherein: The sleeve (80) is configured to be connected to the first terminal, wherein an end face (90) of the sleeve contacts an end face of the first terminal, and wherein in a connected state, air can enter the at least one channel via the first open end, flow through the at least one channel, and exit the at least one channel via the second open end.
6. A circuit breaker pole component according to any one of claims 1 to 5, wherein: The second terminal comprises at least one pipe or at least one channel (70); and wherein the at least one pipe or the at least one channel of the second terminal comprises a first open end and a second open end, so that air can enter the at least one pipe or the at least one channel via the first open end of the at least one pipe or the at least one channel of the second terminal, flow through the at least one pipe or the at least one channel, and leave the at least one pipe or the at least one channel via the second open end of the at least one pipe or the at least one channel of the second terminal.
7. A bushing (80) for a circuit breaker pole component (10), the circuit breaker pole component comprising a first terminal (20) and a second terminal (30), wherein: The circuit breaker pole component comprises a stationary contact and a moving contact, wherein the first terminal is electrically connected to the stationary contact or the moving contact, wherein the second terminal is electrically connected to the stationary contact or the moving contact as a contact not electrically connected to the first terminal; wherein the first terminal comprises an end surface (40), and wherein the second terminal comprises an end surface (50); and Wherein, the sleeve comprises: - at least one conduit or at least one channel (100); and - end face (90); wherein the at least one duct or the at least one channel comprises a first open end located at one end of the at least one duct or the at least one channel and a second open end located at an opposite end of the at least one duct or the at least one channel, such that air can enter the at least one duct or the at least one channel via the first open end, flow through the at least one duct or the at least one channel, and leave the at least one duct or the at least one channel via the second open end; and The end surface (90) of the bushing is configured to be connected to an end surface of a first terminal of the circuit breaker pole component and / or an end surface of a second terminal of the circuit breaker pole component.
8. The sleeve according to claim 7, wherein: The at least one duct or at least one channel is at least one duct, and wherein the at least one duct between the first open end and the second open end has a side wall surface formed only by the sleeve.
9. The sleeve according to claim 7, wherein: The at least one duct or the at least one channel is at least one channel in the end face (90) of the sleeve.
10. The sleeve according to claim 9, wherein: The width of the one or more of the at least one channel of the sleeve varies between a first open end and a second open end of the one or more of the at least one channel; and / or wherein the direction of the one or more of the at least one channel of the sleeve varies between a first open end and a second open end of the one or more of the at least one channel.
11. The sleeve according to any one of claims 9 to 10, wherein: The end face of the sleeve is configured to be connected to the end face of the first terminal, wherein the end face (90) of the sleeve contacts the end face of the first terminal, and wherein air can enter the at least one channel via the first open end, flow through the at least one channel, and leave the at least one channel via the second open end, and / or wherein the end face of the sleeve is configured to be connected to the end face of the second terminal, wherein the end face (90) of the sleeve contacts the end face of the second terminal, and wherein air can enter the at least one channel via the first open end, flow through the at least one channel, and leave the at least one channel via the second open end.
12. A circuit breaker system, comprising: - a circuit breaker pole part (10); and - a sleeve (80); wherein the bushing is configured to be connected to the circuit breaker pole component; Wherein, the circuit breaker pole component comprises a first terminal (20) and a second terminal (30); wherein the circuit breaker pole component comprises a stationary contact and a moving contact, wherein the first terminal is electrically connected to the stationary contact or the moving contact, and wherein the second terminal is electrically connected to the stationary contact or the moving contact as a contact not electrically connected to the first terminal; Wherein, the first terminal comprises an end surface (40); wherein the first terminal comprises at least one channel (60) located in an end surface of the first terminal; and wherein the at least one channel of the first terminal comprises a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, so that air can enter the at least one channel of the first terminal via the first open end, flow through the at least one channel of the first terminal, and leave the at least one channel of the first terminal via the second open end; Wherein, the sleeve comprises an end surface (90); wherein the sleeve comprises at least one channel (100) located in an end surface of the sleeve; wherein the at least one channel of the sleeve comprises a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, such that air can enter the at least one channel of the sleeve via the first open end, flow through the at least one channel of the sleeve, and leave the at least one channel of the sleeve via the second open end; and The end surface of the sleeve is configured to be connected to the end surface of the first terminal, wherein in a connected state, air can flow through the at least one channel of the sleeve, and wherein the air can flow through the at least one channel of the first terminal.
13. The circuit breaker system according to claim 12, wherein: In a state where the bushing is connected to the circuit breaker pole member, the at least one channel of the bushing is configured to align with the at least one channel of the first terminal.
14. The circuit breaker system according to any one of claims 12 to 13, wherein: The system includes a second casing, wherein the second sleeve comprises an end surface (90); wherein the second sleeve comprises at least one channel (100) located in an end surface of the second sleeve; wherein the at least one channel of the second sleeve comprises a first open end at one end of the at least one channel and a second open end at an opposite end of the at least one channel, such that air can enter the at least one channel of the second sleeve via the first open end, flow through the at least one channel of the second sleeve, and exit the at least one channel of the second sleeve via the second open end; Wherein, the second terminal comprises an end surface (50); wherein the second terminal comprises at least one channel (70) located in an end surface of the second terminal; and wherein the at least one channel of the second terminal comprises a first open end located at one end of the at least one channel and a second open end located at an opposite end of the at least one channel, so that air can enter the at least one channel of the second terminal via the first open end, flow through the at least one channel of the second terminal, and leave the at least one channel of the second terminal via the second open end; and wherein an end surface of the second sleeve is configured to be connected to an end surface of the second terminal, wherein in a connected state, air can flow through the at least one channel of the second sleeve, and wherein the air can flow through the at least one channel of the second terminal.
15. The circuit breaker system according to claim 14, wherein: In a state where the second bushing is connected to the circuit breaker pole member, the at least one channel of the second bushing is configured to align with the at least one channel of the second terminal.