Anti-tripping system for circuit breaker of gas-insulated switchgear

Abstract

The utility model provides a gas-insulated switchgear breaker anti-tripping system, which comprises a closing loop, an anti-tripping loop and a microcomputer protector, one end of the closing loop is connected with the positive pole of a power supply, the other end of the closing loop is connected with one end of the microcomputer protector, and the other end of the microcomputer protector is connected with the negative pole of the power supply; wherein one end of the anti-tripping loop is connected with one end of the closing loop connected with the anode of the power supply, and the other end is connected with the other end of the microcomputer protection and the cathode of the power supply. According to the utility model, by adjusting the nodes of the anti-tripping loop, the anti-tripping loop is independent of the closing loop, and the closing permissible node cannot disconnect the anti-tripping loop, so that the normal operation of the anti-tripping function is ensured, and the safety performance of equipment during operation is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical control technology, specifically to an anti-pumping system for gas-insulated switchgear circuit breakers. Background Technology

[0002] The current relay protection device's operating box is equipped with a closing holding relay in the closing holding circuit, and the circuit breaker's structural anti-pumping circuit is equipped with a mechanism anti-pumping relay. The closing holding circuit and the closing coil circuit are electrically connected. Only when a complete circuit is formed between the closing holding relay and the mechanism anti-pumping relay can the circuit breaker close normally.

[0003] Because the original market circuit breaker anti-pumping circuit adopts the design principle of being connected in parallel with the closing circuit, the anti-pumping failure phenomenon occurs in projects with closing permission logic hard nodes in the closing circuit, causing the circuit breaker to reclose due to faults, which in severe cases threatens the safety of equipment operation and personal safety. Utility Model Content

[0004] The purpose of this invention is to provide an anti-pumping system for gas-insulated switchgear circuit breakers. This invention adjusts the anti-pumping circuit node to make it independent of the closing circuit, so that the closing allow node cannot disconnect the anti-pumping circuit, ensuring the normal operation of the anti-pumping function and improving the safety performance of the equipment during operation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An anti-pumping system for a gas-insulated switchgear includes a closing circuit, an anti-pumping circuit, and a microprocessor protection system. One end of the closing circuit is connected to the positive terminal of the power supply, and the other end is connected to one end of the microprocessor protection system. The other end of the microprocessor protection system is connected to the negative terminal of the power supply.

[0007] One end of the anti-pumping circuit is connected to one end of the closing circuit and the positive terminal of the power supply, while the other end is connected to the other end of the microprocessor protection and the negative terminal of the power supply.

[0008] Furthermore, the anti-pumping system also includes a closing button 1SB, one end of which is connected to the positive terminal of the power supply, and the other end of which is connected to the closing circuit and the anti-pumping circuit respectively.

[0009] Furthermore, in some preferred embodiments, the closing circuit includes an anti-pumping relay FT, a circuit breaker opening position FW, and an energy storage circuit breaker CN. The normally closed contact of the anti-pumping relay FT, the circuit breaker opening position FW, and the energy storage circuit breaker CN are connected in sequence, and the other end of the energy storage circuit breaker CN is connected to one end of the microprocessor protection.

[0010] Furthermore, in some preferred embodiments, the anti-pumping circuit includes an anti-pumping coil, a circuit breaker closing position HW, an anti-pumping relay FT normally open contact connected to one end of the anti-pumping coil, the other end of the anti-pumping coil connected to the microprocessor protection and the negative terminal of the power supply, the anti-pumping relay FT normally open contact linked with the normally closed contact of the anti-pumping relay FT, one end of the circuit breaker closing position HW connected to one end of the normally open and normally closed contacts of the anti-pumping relay FT, and the other end connected to the other end of the normally open contact of the anti-pumping relay FT and the anti-pumping coil.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In practical use, this invention connects one end of the closing circuit to the positive terminal of the power supply and the other end to one end of the microprocessor protection system, while the other end of the microprocessor protection system is connected to the negative terminal of the power supply. One end of the anti-pumping circuit is connected to the end of the closing circuit connected to the positive terminal of the power supply, and the other end is connected to the other end of the microprocessor protection system and the negative terminal of the power supply. Existing market electrical designs, after incorporating the microprocessor-based closing allowance logic, cannot guarantee the normal function of the anti-pumping relay, potentially leading to equipment and personal safety hazards. By optimizing the anti-pumping relay output and adjusting the anti-pumping circuit points, the normal function of the anti-pumping relay is guaranteed, ensuring the safety of equipment operation and maintenance. This invention adjusts the anti-pumping circuit node to make it independent of the closing circuit; its closing allowance node cannot disconnect the anti-pumping circuit, ensuring the normal operation of the anti-pumping function and improving the safety performance of the equipment during operation. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 To optimize the state diagram before instantaneous closing.

[0015] Figure 2 To optimize the state diagram after instantaneous closing.

[0016] Figure 3 This is a diagram showing the state of the circuit breaker before closing when the 1SB closing button is stuck together.

[0017] Figure 4 This is a diagram showing the state of the circuit breaker after closing when the 1SB closing button is stuck together.

[0018] Figure 5 This is a diagram showing the state of the circuit breaker when the 1SB closing button is stuck and the circuit breaker trips due to a fault.

[0019] Figure 6 This is a diagram showing the state of the 1SB closing button of this utility model before closing the circuit breaker when it is not stuck together.

[0020] Figure 7 This is a diagram showing the state of the 1SB closing button of this utility model after closing the circuit breaker momentarily when it is not adhered.

[0021] Figure 8 This is a diagram showing the state of the circuit breaker before closing when the 1SB closing button of this utility model is stuck together.

[0022] Figure 9 This is a diagram showing the state of the 1SB closing button of the present invention after the circuit breaker is closed.

[0023] Figure 10 This is a diagram showing the state of the 1SB closing button of the present invention after the circuit breaker trips due to a fault.

[0024] Figure 11 This diagram shows the circuit breaker in the open position when it trips due to a fault. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model 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 limitations on the embodiments of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0029] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0031] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] Example 1

[0033] This embodiment discloses an anti-pumping system for a gas-insulated switchgear circuit breaker, including a closing circuit, an anti-pumping circuit, and a microprocessor protection. One end of the closing circuit is connected to the positive terminal of the power supply, and the other end is connected to one end of the microprocessor protection. The other end of the microprocessor protection is connected to the negative terminal of the power supply.

[0034] One end of the anti-pumping circuit is connected to one end of the closing circuit and the positive terminal of the power supply, while the other end is connected to the other end of the microprocessor protection and the negative terminal of the power supply.

[0035] Furthermore, in this embodiment, the anti-pumping system also includes a closing button 1SB, one end of which is connected to the positive terminal of the power supply, and the other end of which is connected to the closing circuit and the anti-pumping circuit respectively.

[0036] Furthermore, in this embodiment, the closing circuit includes an anti-pumping relay FT, a circuit breaker opening position FW, and an energy storage circuit breaker CN. The normally closed contact of the anti-pumping relay FT, the circuit breaker opening position FW, and the energy storage circuit breaker CN are connected in sequence, and the other end of the energy storage circuit breaker CN is connected to one end of the microprocessor protection.

[0037] Furthermore, in this embodiment, the anti-pumping circuit includes an anti-pumping coil, a circuit breaker closing position HW, an anti-pumping relay FT normally open contact connected to one end of the anti-pumping coil, the other end of the anti-pumping coil connected to the microprocessor protection and the negative terminal of the power supply, the anti-pumping relay FT normally open contact linked with the normally closed contact of the anti-pumping relay FT, one end of the circuit breaker closing position HW connected to one end of the normally open and normally closed contacts of the anti-pumping relay FT, and the other end connected to the other end of the normally open contact of the anti-pumping relay FT and the anti-pumping coil.

[0038] In practical use, this invention connects one end of the closing circuit to the positive terminal of the power supply and the other end to one end of the microprocessor protection system, while the other end of the microprocessor protection system is connected to the negative terminal of the power supply. One end of the anti-pumping circuit is connected to the end of the closing circuit connected to the positive terminal of the power supply, and the other end is connected to the other end of the microprocessor protection system and the negative terminal of the power supply. Existing market electrical designs, after incorporating the microprocessor-based closing allowance logic, cannot guarantee the normal function of the anti-pumping relay, potentially leading to equipment and personal safety hazards. By optimizing the anti-pumping relay output and adjusting the anti-pumping circuit points, the normal function of the anti-pumping relay is guaranteed, ensuring the safety of equipment operation and maintenance. This invention adjusts the anti-pumping circuit node to make it independent of the closing circuit; its closing allowance node cannot disconnect the anti-pumping circuit, ensuring the normal operation of the anti-pumping function and improving the safety performance of the equipment during operation.

[0039] To facilitate a better understanding of this invention by those skilled in the art, the following detailed description is provided in conjunction with specific implementation examples.

[0040] Before optimization:

[0041] 1. Normal 1:

[0042] The 1SB closing button is not attached; this is the state before the circuit breaker is closed. (See attached image.) Figure 1 , Figure 1 To optimize the state before instantaneous closing. At this time, the circuit breaker is in the open position FW (closed point), HW (open point), and the spring is energized CN (closed point). The microprocessor protection meets the closing conditions (circuit breaker open position + spring energized) (closed point); the 1SB closing button is activated instantaneously (instantly changes from open point to closed point and then returns to open point), so that the HQ closing coil is energized instantaneously to close the circuit breaker.

[0043] 2. Normal 2: The 1SB closing button is not stuck, and the circuit breaker is in the following state after closing;

[0044] See Figure 2 The circuit breaker is in the closed position (FW, open), HW, closed, and the spring is charged (CN, open). The microprocessor protection does not meet the closing conditions (circuit breaker closed + spring not charged) (open).

[0045] 3. Abnormality 1: The 1SB closing button is stuck, which is the state before the circuit breaker is closed;

[0046] See Figure 3 Fault 1SB closing button stuck (closed): The circuit breaker is in the open position FW (closed), HW (open), and the spring is charged CN (closed). The microprocessor protection meets the closing conditions (circuit breaker open + spring charged) (closed). Because the 1SB closing button is stuck (closed), the HQ closing coil is energized to close the circuit breaker.

[0047] 4. Abnormality 2: The 1SB closing button is stuck, which is the status after the circuit breaker is closed;

[0048] See Figure 4 Fault 1SB closing button stuck (closed): The circuit breaker is in the closed position FW (open), HW (closed), and the spring is not charged CN (open). The microprocessor protection does not meet the closing conditions (circuit breaker closed + spring not charged) (open).

[0049] 5. Abnormality 3: 1SB closing button stuck together. After the circuit breaker closes and CN energy storage is completed, the circuit breaker trips due to a fault.

[0050] See Figure 5 Fault 1SB closing button stuck (closed): The circuit breaker is in the open position (FW, closed), HW (open), and the spring is charged (CN, closed). The microprocessor protection meets the closing conditions (circuit breaker open + spring charged) (closed), causing the circuit breaker to close again. Because the FT relay was not energized and operated during the entire series of faults 1-3, the anti-pumping function failed, and the circuit breaker repeatedly operated under faults 1-3, opening and closing an unlimited number of times, threatening the safety of equipment operation and personal safety.

[0051] After optimization using this application:

[0052] 1. Normal 1: 1SB closing button is not stuck, state before circuit breaker closing;

[0053] The electrical design was optimized and modified, and the anti-pumping circuit node was adjusted to make it independent of the closing circuit. The microprocessor protection closing permission node cannot disconnect the anti-pumping circuit, ensuring the normal operation of the anti-pumping function.

[0054] See Figure 6 ,exist Figure 6In the middle, the state before instantaneous closing is: the circuit breaker is in the open position FW (closed point) or HW (open point), the spring is energized CN (closed point), and the microprocessor protection meets the closing conditions (circuit breaker in open position + spring energized) (closed point); the 1SB closing button is activated instantaneously (instantly the open point becomes the closed point and then returns to the open point), so that the HQ closing coil is energized instantaneously to close the circuit breaker.

[0055] 2. Normal 2: The 1SB closing button is not stuck, and the circuit breaker is in the following state after closing;

[0056] See Figure 7 The state after instantaneous closing is as follows: the circuit breaker is in the closed position FW (open), HW (closed), and the spring is energized CN (open). The microprocessor protection does not meet the closing conditions (circuit breaker closed + spring not energized) (open).

[0057] 3. Abnormality 1: The 1SB closing button is stuck, which is the state before the circuit breaker is closed.

[0058] See Figure 8 Fault 1SB closing button stuck (closed): The circuit breaker is in the open position FW (closed), HW (open), and the spring is charged CN (closed). The microprocessor protection meets the closing conditions (circuit breaker open + spring charged) (closed). Because the 1SB closing button is stuck (closed), the HQ closing coil is energized to close the circuit breaker.

[0059] 4. Abnormality 2: The 1SB closing button is stuck, which is the status after the circuit breaker is closed;

[0060] See Figure 9 The fault is that the 1SB closing button is stuck (closed): the circuit breaker is in the closed position FW (open), HW (closed), the spring is not charged CN (open), and the microprocessor protection does not meet the closing conditions (circuit breaker closed + spring not charged) (open).

[0061] 5. Abnormality 3: The 1SB closing button is stuck. After the circuit breaker is closed, the spring stores energy. Because the FT relay is energized through the 1SB closing button (closed point) and the circuit breaker closed position (closed point), the FT relay is energized.

[0062] See Figure 10 The diagram shows the stuck state of the 1SB closing button (closed point): the circuit breaker is in the closed position FW (open point), HW (closed point), and the spring energy storage CN (closed point). The microprocessor protection does not meet the closing conditions (circuit breaker closed + spring energy storage) (open point). Because the FT relay is energized, the FT open point of the anti-pumping circuit becomes the closed point, the FT closed point of the closing circuit becomes the open point, the closing circuit is disconnected, the HQ closing coil is not energized, the anti-pumping function is activated and self-holding.

[0063] 6. Abnormality 4: The 1SB closing button is stuck. After the circuit breaker is closed, the spring stores energy. Because the FT relay is energized via the 1SB closing button (closed point) and the circuit breaker in the closed position (closed point), the anti-pumping circuit is activated. At this time, if a fault occurs in the circuit breaker, it will trip and the circuit breaker will be in the open position.

[0064] See Figure 11 Fault 1SB closing button stuck (closed): The circuit breaker is in the open position FW (closed), HW (open), and spring energy storage CN (closed). The microprocessor protection meets the closing conditions (circuit breaker open + spring energy storage) (closed). Because the FT relay is energized, the anti-pumping circuit FT open point becomes closed, the closing circuit FT closed point becomes open, the closing circuit is disconnected, the HQ closing coil is not energized, the anti-pumping function is activated and self-holding.

[0065] As mentioned above, in existing market electrical design schemes, the introduction of microprocessor-based closing permission point logic cannot guarantee the normal function of the anti-pumping relay, potentially leading to equipment and personal safety hazards. By optimizing the anti-pumping relay output and adjusting the anti-pumping circuit points, the normal function of the anti-pumping relay is guaranteed, ensuring the safety of equipment operation and maintenance.

[0066] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas-insulated switchgear circuit breaker anti-pumping system, comprising a closing circuit, an anti-pumping circuit, and a microprocessor-based protection system, characterized in that: One end of the closing circuit is connected to the positive terminal of the power supply, and the other end is connected to one end of the microprocessor protection. The other end of the microprocessor protection is connected to the negative terminal of the power supply. One end of the anti-pumping circuit is connected to one end of the closing circuit and the positive terminal of the power supply, while the other end is connected to the other end of the microprocessor protection and the negative terminal of the power supply.

2. The anti-pumping system for a gas-insulated switchgear according to claim 1, characterized in that: The anti-pumping system also includes a closing button 1SB. One end of the closing button 1SB is connected to the positive terminal of the power supply, and the other end of the closing button 1SB is connected to the closing circuit and the anti-pumping circuit respectively.

3. The anti-pumping system for a gas-insulated switchgear according to claim 1, characterized in that: The closing circuit includes an anti-pumping relay FT, a circuit breaker open position FW, and an energy storage circuit breaker CN. The normally closed contact of the anti-pumping relay FT, the circuit breaker open position FW, and the energy storage circuit breaker CN are connected in sequence. The other end of the energy storage circuit breaker CN is connected to one end of the microprocessor protection system.

4. The anti-pumping system for a gas-insulated switchgear according to claim 3, characterized in that: The anti-pumping circuit includes an anti-pumping coil, a circuit breaker closing position HW, an anti-pumping relay FT whose normally open contact is connected to one end of the anti-pumping coil, and the other end of the anti-pumping coil is connected to the microprocessor protection and the negative terminal of the power supply. The normally open contact of the anti-pumping relay FT is linked with the normally closed contact of the anti-pumping relay FT. One end of the circuit breaker closing position HW is connected to one end of the normally open and normally closed contacts of the anti-pumping relay FT, and the other end is connected to the other end of the normally open contact of the anti-pumping relay FT and the anti-pumping coil.

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