Anti-tripping circuit of circuit breaker and circuit breaker comprising same

Abstract

The utility model relates to an anti-tripping circuit for a circuit breaker and the circuit breaker comprising the same. An anti-tripping circuit for a circuit breaker includes: a first input terminal and a second input terminal configured to receive a voltage input; a non-electronic closing coil connected between the first input terminal and the second input terminal and configured to control opening and closing of the circuit breaker; the voltage dividing resistor is connected with the non-electronic closing coil in series; and a circuit conversion unit connected between the first input terminal and the second input terminal, and configured to control whether the divider resistor is bypassed. Therefore, according to the embodiment of the utility model, in the anti-tripping mode, the non-electronic closing coil can enter a low-voltage holding state and can be electrified for a long time, and meanwhile, the non-electronic closing coil is ensured not to be burnt out.

Description

Technical Field

[0001] This utility model relates to the field of power products, and more specifically, to an anti-pumping circuit for a circuit breaker and a circuit breaker including the anti-pumping circuit. Background Technology

[0002] Currently, the closing and opening functions of circuit breakers are achieved through closing and opening devices (such as push buttons) or by triggering the trip coil via electrical closing and opening signals. Anti-pumping is a very common requirement for circuit breakers. "Anti-pumping" in circuit breakers means that, using mechanical or electrical interlocking devices, a closing command can only close the circuit breaker once, regardless of its duration. If the circuit breaker needs to be closed a second time, a new closing command must be sent after the previous closing command has expired.

[0003] Common anti-pumping functions include electrical anti-pumping and mechanical anti-pumping. Electrical anti-pumping solutions are relatively mature. However, in the case of mechanical anti-pumping, since non-electronic coils generally cannot be energized for extended periods, achieving reliable mechanical anti-pumping is a challenge when the circuit breaker is equipped with a non-electronic coil.

[0004] Therefore, a reliable mechanical anti-jump solution is needed to protect non-electronic coils. Utility Model Content

[0005] This utility model relates to an anti-pumping circuit for a circuit breaker, characterized in that it includes: a first input terminal and a second input terminal configured to receive voltage input; a non-electronic closing coil connected between the first input terminal and the second input terminal and configured to control the opening and closing of the circuit breaker; a voltage dividing resistor connected in series with the non-electronic closing coil; and a circuit switching unit connected between the first input terminal and the second input terminal and configured to control whether the voltage dividing resistor is bypassed.

[0006] In one example, the circuit switching unit includes: a first circuit switching auxiliary contact connected between a first input terminal and a relay; a second circuit switching auxiliary contact connected in parallel with a voltage divider resistor; and a relay connected in series with the first circuit switching auxiliary contact and connected to a second input terminal, and configured to control the closing and opening of the first and second circuit switching auxiliary contacts.

[0007] In one example, the anti-pumping circuit further includes: a first energy storage state contact connected between the first input terminal and the non-electronic closing coil; and a second energy storage state contact connected between the first energy storage state contact and the relay.

[0008] In one example, when the circuit breaker receives a closing command, voltage input is provided to the first input terminal and the second input terminal. When the circuit breaker completes energy storage, the first energy storage state contact closes, and the second energy storage state contact opens after a predetermined period of time.

[0009] In one example, during a predetermined time period, the first energy storage state contact closes and the second energy storage state contact closes, energizing the relay.

[0010] In one example, a relay controls the first circuit switching auxiliary contact to close, and a relay controls the second circuit switching auxiliary contact to open, so as to connect the voltage divider resistor in series with the non-electronic closing coil.

[0011] In one example, the anti-pumping circuit further includes: a closing / opening state auxiliary switch, connected in series between the first energy storage state contact and the non-electronic closing coil, and configured to open when the circuit breaker completes closing and close when the circuit breaker completes opening.

[0012] In one example, the first energy storage state contact is a normally open contact, the second energy storage state contact is a normally closed contact, the first circuit switching auxiliary contact is a normally open contact, and the second circuit switching auxiliary contact is a normally closed contact.

[0013] In one example, when the circuit breaker completes closing, the first energy storage state contact is reset to the normally open state, and the second energy storage state contact is reset to the normally closed state.

[0014] This utility model also relates to a circuit breaker, characterized in that it includes the anti-pumping circuit as described above.

[0015] Therefore, according to the embodiments of this utility model, in the anti-pumping mode, the non-electronic closing coil can enter a low-voltage holding state and be energized for a long time, while ensuring that the non-electronic closing coil is not burned out. Attached Figure Description

[0016] The above and other aspects, features, and advantages of specific embodiments of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 This is a schematic diagram illustrating the mechanical anti-pumping structure of a circuit breaker according to an embodiment of the present invention;

[0018] Figure 2 A schematic diagram showing the normal closing state of the circuit breaker according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram illustrating a situation where a circuit breaker according to an embodiment of the present invention receives a closing command but fails to close;

[0020] Figure 4 A schematic diagram showing the situation where the mechanical anti-jump mechanism is unlocked;

[0021] Figure 5 A schematic block diagram of a mechanical anti-pumping circuit for a circuit breaker according to an embodiment of the present invention is shown;

[0022] Figure 6 A schematic circuit diagram of a more detailed mechanical anti-pumping circuit for a circuit breaker according to an embodiment of the present invention is shown; and

[0023] Figure 7 A schematic circuit diagram of a mechanical anti-bounce circuit according to an embodiment of the present invention is shown in anti-bounce mode. Detailed Implementation

[0024] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used throughout this invention. The terms “comprising” and “including” and their derivatives mean, but are not limited to, any of the following. The term “controller” or “control unit” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and / or firmware. For example, a controller may include, for instance, an application-specific integrated circuit (ASIC), a general-purpose or special-purpose central processing unit (CPU), a digital signal processor (DSP), and programmable logic devices such as a field-programmable gate array (FPGA). A controller may be manufactured as a single printed circuit board (PCB) or distributed across several interconnected PCBs. A controller may include other processing circuitry; for example, a controller may include two processing circuits such as an FPGA and a CPU interconnected on a PCB. The functionality associated with any particular controller may be centralized or distributed, either local or remote. The phrase “at least one,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and perhaps only one item from the list is required. For example, "at least one of A, B, and C" includes any one of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C. Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance or order. In embodiments of this disclosure, unless otherwise expressly stated, "connection" does not necessarily mean "direct connection" or "direct contact," but only requires electrical connection.

[0025] Definitions of other specific words and phrases are provided throughout this invention. Those skilled in the art will understand that, in many, if not most, cases, such definitions apply to the prior and future use of the words and phrases thus defined.

[0026] The various embodiments of the present invention described below with reference to the accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of the present invention in any way. Those skilled in the art will understand that the principles of the present invention can be implemented in any suitably arranged system or device. In some cases, the actions described in the present invention can be performed in different orders and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired result. In certain embodiments, multitasking and parallel processing may be advantageous.

[0027] The text and accompanying drawings are provided by way of example only to aid in understanding the present invention. They should not be construed as limiting the scope of the appended claims in any way. Although certain embodiments and examples have been provided, it will be clear to those skilled in the art, based on the content of the present invention, that changes can be made to the illustrated embodiments and examples without departing from the scope of the present invention.

[0028] Figure 1 This is a schematic diagram illustrating the mechanical anti-pumping structure 100 of a circuit breaker according to an embodiment of the present invention.

[0029] like Figure 1 As shown, the mechanical anti-jump structure 100 may include a non-electronic closing coil 1, a closing coil pin 2, a closing drive board 3, a slider reset spring 4, a slider 5, a mechanical state transmission crank arm 6, a half-shaft bearing 7, a closing trip half-shaft 8, and a closing coil mounting plate 9.

[0030] Below, we will refer to Figures 2 to 4 Describe the process of mechanical anti-jump operation.

[0031] Figure 2 A schematic diagram showing the normal closing state of a circuit breaker according to an embodiment of the present invention is provided. Figure 3 This diagram illustrates a scenario where a circuit breaker according to an embodiment of the present invention receives a closing command but fails to close. Figure 4 This diagram illustrates the situation where the mechanical anti-skid mechanism is unlocked.

[0032] like Figure 2 As shown, when the circuit breaker receives a closing command, the non-electronic closing coil 3 is energized and energy storage is completed. The closing coil pin 2 is pushed out, causing the closing drive plate 3 to press the slider 5. This drives the closing trip half-shaft 8 to rotate through the linkage mechanism and clutch mechanism, so that the circuit breaker can close normally.

[0033] However, if the closing command remains active, and after the circuit breaker completes closing, it trips due to a fault or other circumstances, energizing the closing coil again. At this point, energy storage is not yet complete. Figure 3As shown, the closing coil pin 2 is pushed out, and the closing drive plate 3 is facing downwards. However, due to the gap between the closing drive plate 3 and the slider 5, the closing drive plate 3 will not contact the slider 5, thus preventing the closing trip half-shaft 8 from rotating. In this situation, the circuit breaker will not close again. That is to say, in this case, although the closing command still exists, the circuit breaker will not close, thereby achieving the mechanical anti-pumping function.

[0034] However, if the closing command is not revoked and persists, the closing coil pin 2 may remain extended, continuously energizing the non-electronic closing coil 3, potentially causing it to burn out. Therefore, protection for the non-electronic closing coil 3 is necessary.

[0035] like Figure 4 As shown, when the closing command disappears, the non-electronic closing coil 3 is de-energized, and the closing coil pin 2 retracts, thereby unlocking the mechanical anti-pumping function.

[0036] Figure 5 A schematic block diagram of a mechanical anti-pumping circuit 500 for a circuit breaker according to an embodiment of the present invention is shown.

[0037] like Figure 5 As shown, the mechanical anti-pumping circuit 500 may include: a first input terminal 4 and a second input terminal 14, configured to receive a voltage input; a non-electronic closing coil XF, connected between the first input terminal 4 and the second input terminal 14, and configured to control the opening and closing of the circuit breaker; a voltage dividing resistor R, connected in series with the non-electronic closing coil XF; and a circuit switching unit, connected between the first input terminal 4 and the second input terminal 14, and configured to control whether the voltage dividing resistor R is bypassed.

[0038] Therefore, according to the present invention, after the non-electronic closing coil XF is energized, the voltage divider resistor R can be connected in series with the non-electronic closing coil XF through the circuit conversion unit control, so that the non-electronic closing coil XF can enter a low voltage holding state and be energized for a long time, ensuring that the closing coil pin 2 is continuously pushed out, while ensuring that the non-electronic closing coil XF is not burned out.

[0039] Figure 6 A schematic circuit diagram of a more detailed mechanical anti-pumping circuit 600 for a circuit breaker according to an embodiment of the present invention is shown.

[0040] like Figure 6 As shown, the circuit conversion unit may include: a first circuit conversion auxiliary contact J-1, a second circuit conversion auxiliary contact J-2, and a relay J.

[0041] The first circuit switching auxiliary contact J-1 can be connected between the first input terminal 4 and the relay J. The second circuit switching auxiliary contact J-2 can be connected in parallel with the voltage divider resistor R. The relay J can be connected in series with the first circuit switching auxiliary contact J-1 and connected to the second input terminal 14. It is configured to control the closing and opening of the first circuit switching auxiliary contact J-1 and the second circuit switching auxiliary contact J-2.

[0042] In one example, the mechanical anti-jump circuit 600 may further include: a first energy storage state contact S2-b and a second energy storage state contact S2-a.

[0043] The first energy storage state contact S2-b can be connected between the first input terminal 4 and the non-electronic closing coil XF, and the second energy storage state contact S2-a can be connected between the first energy storage state contact S2-b and the relay J.

[0044] When the circuit breaker completes energy storage, the first energy storage state contact S2-b closes and the second energy storage state contact S2-a opens.

[0045] The closing of the first energy storage state contact S2-b and the opening of the second energy storage state contact S2-a do not necessarily occur simultaneously. That is, the second energy storage state contact S2-a can switch its on / off state after a predetermined period of time following the switching of the first energy storage state contact S2-b. The predetermined period of time could be, for example, 100ms. However, this embodiment of the invention is not limited to this.

[0046] Therefore, during the predetermined time period, both the first energy storage state contact S2-b and the second energy storage state contact S2-a can be closed.

[0047] In one example, the first energy storage state contact S2-b is a normally open contact, the second energy storage state contact S2-a is a normally closed contact, the first circuit switching auxiliary contact J-1 is a normally open contact, and the second circuit switching auxiliary contact J-2 is a normally closed contact.

[0048] During the normal closing operation of the circuit breaker, in the initial state, the circuit breaker is in the open, un-energized state. The closing / opening auxiliary switch S11 is closed, the first energy storage state contact S2-b is open, and the second energy storage state contact S2-a is closed. Figure 6 As shown in the image.

[0049] During normal energy storage, after energy storage is complete, the first energy storage state contact S2-b changes from a normally open contact to a closed contact, and the second energy storage state contact S2-a changes from a normally closed contact to an open contact. When the circuit breaker receives a closing command, the first input terminal 4 and the second input terminal 14 are energized. At this time, the relay J is not conducting because the circuit is open, and the voltage divider resistor R is bypassed by the second circuit conversion auxiliary contact J-2.

[0050] Current flows from the first input terminal 4 to the second input terminal 14 via the first energy storage state contact S2-b, the closing / opening state auxiliary switch S11, the non-electronic closing coil XF, and the second circuit conversion auxiliary contact J-2. When the non-electronic closing coil XF is energized, the closing coil pin 2 is pushed out normally, thus the circuit breaker closes normally.

[0051] After the circuit breaker is closed, the auxiliary switch S11 for closing and opening states is opened, the non-electronic closing coil XF is de-energized, and the closing coil pin 2 is reset. At this time, the first energy storage state contact S2-b is reset to a normally open contact, and the second energy storage state contact S2-a is reset to a normally closed contact.

[0052] After the closing command is removed, the first input terminal 4 and the second input terminal 14 are de-energized. After the circuit breaker has re-energized, the first energy storage state contact S2-b changes from normally open to closed, and the second energy storage state contact S2-a changes from normally closed to open. At this time, even if the circuit breaker trips and the closing / tripping auxiliary switch S11 closes again, the non-electronic closing coil XF will not close again because the first input terminal 4 and the second input terminal 14 are de-energized, waiting for the next closing command.

[0053] Figure 7 A schematic circuit diagram of the mechanical anti-bounce circuit 600 according to an embodiment of the present invention is shown in anti-bounce mode.

[0054] In some cases, the circuit breaker may receive the closing command before the circuit breaker's energy storage is completed.

[0055] like Figure 7 As shown, when the circuit breaker receives a closing command, the first input terminal 4 and the second input terminal 14 are supplied with voltage input and energized.

[0056] When the circuit breaker completes energy storage, the first energy storage state contact S2-b closes, and after a predetermined period of time (e.g., 100ms), the second energy storage state contact S2-a opens. In other words, when the circuit breaker completes energy storage, the first energy storage state contact S2-b switches from a normally open position to a closed position, and after a predetermined period of time (e.g., 100ms), the second energy storage state contact S2-a switches from a normally closed position to an open position.

[0057] During the predetermined time period, the first energy storage state contact S2-b closes and the second energy storage state contact S2-a closes, energizing relay J. After relay J is energized, it controls the first circuit switching auxiliary contact J-1 to close and the second circuit switching auxiliary contact J-2 to open, so as to connect the voltage divider resistor R in series with the non-electronic closing coil XF.

[0058] According to this embodiment of the invention, when relay J is energized, the second circuit switching auxiliary contact J-2 opens, and current flows from the first input terminal 4 to the second input terminal 14 via the first energy storage state contact S2-b, the closing / opening state auxiliary switch S11, the non-electronic closing coil XF, and the voltage divider resistor R. The non-electronic closing coil XF is energized, and the closing coil pin 2 is normally ejected, allowing the non-electronic closing coil XF to enter a low-voltage self-holding state and be continuously energized. This ensures that the non-electronic closing coil XF is not burned out while maintaining the continuous ejection of the closing coil pin 2.

[0059] On the other hand, when relay J is energized, relay J controls the first circuit switching auxiliary contact J-1 to switch from normally open to closed, so that current flows from the first input terminal 4 to the second input terminal 14 through the first circuit switching auxiliary contact J-1 and relay J, ensuring that relay J is continuously energized and realizing the electrical self-locking of relay J. During the electrical self-locking period of relay J, the second circuit switching auxiliary contact J-2 remains open, thereby ensuring that the non-electronic closing coil XF is in a low-voltage self-holding state and can be energized for a long time.

[0060] Therefore, according to the embodiment of this utility model, based on the energy storage state of the circuit breaker, by utilizing the switching sequence of the first energy storage state contact S2-b and the second energy storage state contact S2-a, a voltage divider resistor can be connected in series after the non-electronic closing coil has been activated, so that the non-electronic closing coil enters a low voltage holding state and maintains the coil in the ejected state to achieve mechanical anti-pumping.

[0061] In one example, such as Figure 6 and Figure 7 As shown, the auxiliary switch S11 for closing and opening states can be connected in series between the first energy storage state contact S2-b and the non-electronic closing coil XF, and is configured to open when the circuit breaker completes closing and close when the circuit breaker completes opening.

[0062] Therefore, when the circuit breaker can close normally, even if the relay J is energized, the second circuit switching auxiliary contact J-2 will open and the voltage divider resistor R will be connected in series with the non-electronic closing coil XF. However, because the closing and opening status auxiliary switch S11 is opened when the circuit breaker completes closing, no voltage is supplied between the first input terminal 4 and the second input terminal 14, so the non-electronic closing coil XF is de-energized and will not affect the normal operation of the circuit breaker.

[0063] In one example, when the circuit breaker completes closing, the first energy storage state contact S2-b is reset to the normally open state, and the second energy storage state contact S2-a is reset to the normally closed state.

[0064] According to an embodiment of the present invention, a circuit breaker (not shown) may include the anti-pumping circuit as described above.

[0065] Although the present invention has been described with reference to exemplary embodiments, various changes and modifications may be suggested to those skilled in the art. The present invention is intended to cover such changes and modifications that fall within the scope of the appended claims.

[0066] Any description in this invention should not be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined only by the claims.

Claims

1. An anti-pumping circuit for a circuit breaker, characterized in that, include: The first and second input terminals are configured to receive voltage input. A non-electronic closing coil is connected between the first input terminal and the second input terminal and is configured to control the opening and closing of the circuit breaker; A voltage divider resistor is connected in series with the non-electronic closing coil; as well as The circuit conversion unit is connected between the first input terminal and the second input terminal and is configured to control whether the voltage divider resistor is bypassed.

2. The anti-bounce circuit according to claim 1, characterized in that, The circuit conversion unit includes: The first circuit conversion auxiliary contact is connected between the first input terminal and the relay; The second circuit conversion auxiliary contact is connected in parallel with the voltage divider resistor; A relay, connected in series with a first circuit switching auxiliary contact and connected to a second input terminal, is configured to control the closing and opening of the first circuit switching auxiliary contact and the second circuit switching auxiliary contact.

3. The anti-bounce circuit according to claim 2, characterized in that, Also includes: The first energy storage state contact is connected between the first input terminal and the non-electronic closing coil; as well as The second energy storage state contact is connected between the first energy storage state contact and the relay.

4. The anti-bounce circuit according to claim 3, characterized in that, When the circuit breaker receives a closing command, voltage input is provided to the first and second input terminals. When the circuit breaker completes energy storage, the first energy storage state contact closes, and the second energy storage state contact opens after a predetermined period of time.

5. The anti-bounce circuit according to claim 4, characterized in that, During the predetermined time period, the first energy storage state contact closes and the second energy storage state contact closes, energizing the relay.

6. The anti-bounce circuit according to claim 5, characterized in that, The relay controls the first circuit to switch the auxiliary contact to close, and The relay controls the second circuit to open the auxiliary contact, so that the voltage divider resistor is connected in series with the non-electronic closing coil.

7. The anti-bounce circuit according to claim 6, characterized in that, Also includes: The closing / opening auxiliary switch is connected in series between the first energy storage state contact and the non-electronic closing coil, and is configured to open when the circuit breaker completes closing and close when the circuit breaker completes opening.

8. The anti-bounce circuit according to claim 6, characterized in that, The first energy storage state contact is a normally open contact, the second energy storage state contact is a normally closed contact, the first circuit switching auxiliary contact is a normally open contact, and the second circuit switching auxiliary contact is a normally closed contact.

9. The anti-bounce circuit according to claim 8, characterized in that, When the circuit breaker completes closing, the first energy storage state contact is reset to the normally open state, and the second energy storage state contact is reset to the normally closed state.

10. A circuit breaker, characterized in that, Includes the anti-bounce circuit as described in any one of claims 1 to 9.

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