Breaker air blast arc extinguishing device and breaker

Abstract

The utility model discloses a breaker air blast arc extinguishing device and a breaker. The breaker air blast arc extinguishing device comprises a voltage regulation air supply device, an arc extinguishing switch device, a signal acquisition device and a master control device. The pressure regulating gas supply device is connected with the gas inlet end of the arc extinguishing switch device and is used for outputting arc extinguishing gas to the arc extinguishing switch device; the gas outlet end of the arc extinguishing switch device corresponds to a movable area between a moving contact and a static contact of the circuit breaker and is used for spraying the arc extinguishing gas to the movable area; the signal acquisition device is connected with a power supply circuit of the moving and static contacts and is used for acquiring a voltage signal and / or a current signal of the circuit breaker; and the main control device is connected with the signal acquisition device and the arc extinguishing switch device and is used for controlling the on-off state of the arc extinguishing switch device according to the voltage signal and / or the current signal sent by the signal acquisition device. According to the utility model, the air-blast arc extinguishing work can be realized, the arc extinguishing efficiency is high, and the reliability and the safety of the circuit breaker can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field especially relates to a circuit breaker gas blow arc extinguishing device and circuit breaker. BACKGROUND

[0002] In the power system, the circuit breaker is a key protection device, used to cut off the current in abnormal conditions, to protect the circuit and equipment. The traditional circuit breaker often accompanies the generation of arc when breaking large alternating current, which not only causes the loss of contact material, but also may cause electromagnetic interference and overvoltage problems.

[0003] The current circuit breaker includes a circuit breaker housing, a movable contact is arranged inside the circuit breaker housing, the upper end of the movable contact is connected with a static contact, the static contact is located inside an arc extinguishing chamber, the static contact is connected with a current transformer respectively, the current transformer is connected with an insulating sleeve respectively, and the circuit breaker housing is filled with circuit breaker oil. When the movable contact and the static contact of the circuit breaker are separated, an arc is generated. The high temperature of the arc causes the nearby circuit breaker oil to vaporize, decompose, form a gas and a bubble with strong arc extinguishing ability, and the arc is quickly extinguished. However, the arc extinguishing mode of the above-mentioned circuit breaker can only wait for the arc to be generated and the circuit breaker oil to be vaporized, and then the gas and the bubble generated by vaporization can realize arc extinguishing work, resulting in low arc extinguishing efficiency, possible damage to components in high temperature environment, and reduced reliability and safety of the circuit breaker. SUMMARY

[0004] The utility model solves the technical problem of providing a circuit breaker gas blow arc extinguishing device and a circuit breaker, which can realize gas blow arc extinguishing work, has high arc extinguishing efficiency, and can improve the reliability and safety of the circuit breaker.

[0005] In order to solve the above technical problems, the utility model provides a circuit breaker gas blow arc extinguishing device, which comprises a pressure regulating gas supply device, an arc extinguishing switch device, a signal acquisition device and a main control device; the pressure regulating gas supply device is connected with the gas inlet end of the arc extinguishing switch device, used to output arc extinguishing gas to the arc extinguishing switch device; the gas outlet end of the arc extinguishing switch device corresponds to the movable area between the movable and static contacts of the circuit breaker, used to spray the arc extinguishing gas to the movable area; the signal acquisition device is connected with the power supply circuit of the movable and static contacts, used to acquire the voltage signal and / or current signal of the circuit breaker; the main control device is connected with the signal acquisition device and the arc extinguishing switch device respectively, used to control the switching state of the arc extinguishing switch device according to the voltage signal and / or current signal sent by the signal acquisition device.

[0006] As the improvement of the above scheme, the voltage-regulating air supply device comprises a gas storage device and a voltage-regulating device, the gas storage device stores arc-extinguishing gas; and the voltage-regulating device is connected with the gas storage device and the arc-extinguishing switch device respectively, for adjusting the pressure of the arc-extinguishing gas and outputting the voltage-regulated arc-extinguishing gas to the arc-extinguishing switch device.

[0007] As the improvement of the above scheme, the voltage-regulating device comprises a pressure-reducing valve and a pressure controller, the pressure-reducing valve is connected with the gas storage device and the pressure controller respectively, for reducing the pressure of the arc-extinguishing gas output by the gas storage device and outputting the pressure-reduced arc-extinguishing gas to the pressure controller; and the pressure controller is connected with the arc-extinguishing switch device, for outputting the arc-extinguishing gas with stable pressure to the arc-extinguishing switch device.

[0008] As the improvement of the above scheme, the arc-extinguishing switch device is a high-frequency electromagnetic valve.

[0009] As the improvement of the above scheme, the signal collecting device comprises a current collecting sensor and / or a voltage collecting sensor.

[0010] As the improvement of the above scheme, the main control device comprises an MCU module.

[0011] As the improvement of the above scheme, the gas storage device is a high-pressure gas cylinder.

[0012] Correspondingly, the utility model also provides a circuit breaker, including circuit breaker body and above-mentioned circuit breaker gas blow arc extinguishing device, circuit breaker gas blow arc extinguishing device sets in circuit breaker body.

[0013] The utility model has the advantages that:

[0014] The utility model can collect circuit signal of circuit breaker in real time, and can control switch state of arc extinguishing switch device at best time point according to circuit zero-crossing point detection result, and spray out arc-extinguishing gas to movable area between moving contact and static contact of circuit breaker in time, and close arc extinguishing switch device after arc extinguishing, realize high-precision arc extinguishing work, can effectively improve arc extinguishing efficiency, reduce contact wear and tear and electromagnetic interference, thereby improve reliability and security of circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure diagram of circuit breaker gas blow arc extinguishing device of the utility model Figure One ;

[0016] Figure 2 It is the structure diagram of circuit breaker gas blow arc extinguishing device of the utility model Figure Two ;

[0017] Figure 3It is a structure schematic diagram of the circuit breaker. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described further in detail below with reference to the drawings. Only this statement, the up, down, left, right, front, back, inside, outside and other orientation words appearing or about to appear in the text of the utility model, only take the drawings of the utility model as the base, it is not the specific limitation of the utility model.

[0019] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0020] In the description of the utility model, it is necessary to explain that, unless otherwise specifically specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0021] As Figure 1 As shown in the utility model provides a kind of circuit breaker gas blowout arc device, including pressure regulating gas supply device 1, arc extinguishing switch device 2, signal acquisition device 3 and main control device 4;Pressure regulating gas supply device 1 is connected with the air inlet end of arc extinguishing switch device 2 by pipeline, for output arc extinguishing gas to arc extinguishing switch device 2;The air outlet end of arc extinguishing switch device 2 corresponds to the movable region 6 between circuit breaker's movable contact 5, for spraying the arc extinguishing gas to the movable region 6;Signal acquisition device 3 is connected with the power supply line of movable contact 5, for collecting the voltage signal or current signal of circuit breaker;The main control device 4 is connected with signal acquisition device 3 and arc extinguishing switch device 2 respectively, for controlling the switch state of arc extinguishing switch device 2 according to the voltage signal or current signal sent by signal acquisition device 3.

[0022] The utility model discloses a master control device 4 can carry out signal zero -cross detection processing according to the voltage signal or current signal of the circuit breaker, and can control the switch state of arc extinguishing switch device 2 at the best time point according to the circuit zero -cross detection result, and sends arc extinguishing control instruction to arc extinguishing switch device 2 in time, so that the arc extinguishing switch device 2 is opened at the best time, at this moment, the arc extinguishing gas blows to the movable area 6 between the moving contact and static contact 5 of circuit breaker, and the arc extinguishing gas is used to blow and extinguish the arc in movable area 6, and the arc extinguishing switch device is closed after arc extinguishing, realizes high -precision arc extinguishing work, can effectively improve arc extinguishing efficiency, reduces contact wear and tear and electromagnetic interference, thereby improves the reliability and safety of circuit breaker.

[0023] In other embodiments, voltage and current signals can be collected simultaneously, and arc extinguishing function is triggered by multiple detection trigger conditions, such as voltage and current signal zero -cross, and the master control device 4 controls the arc extinguishing switch device 2 to blow and extinguish arc, improving arc extinguishing control precision and efficiency.

[0024] It should be noted that other existing arc detection algorithms can also be used to detect arc conditions according to the collected circuit signals, so as to accurately control the arc extinguishing switch device 2 to blow and extinguish arc.

[0025] In order to avoid the influence of too high or too low pressure of arc extinguishing gas on the normal operation and safety of circuit breaker. Figure 2 As shown in the figure, the pressure regulating gas supply device 1 includes a gas storage device 11 and a pressure regulating device 12, the gas storage device 11 stores arc extinguishing gas with specified pressure; the two ends of the pressure regulating device 12 are connected with the gas storage device 11 and the arc extinguishing switch device 2 through pipelines respectively, for adjusting the pressure of the arc extinguishing gas and outputting the pressure-regulated arc extinguishing gas to the arc extinguishing switch device 2, to ensure that the pressure of the arc extinguishing gas in the circuit breaker will not be too high or too low, and ensure the normal operation and safety of the circuit breaker. If the pressure of the arc extinguishing gas is too high, it may cause excessive pressure in the circuit breaker, increasing the risk of mechanical wear and electrical breakdown; if the pressure of the arc extinguishing gas is too low, it may affect its arc extinguishing performance, and even cause the arc extinguishing function of the circuit breaker to fail.

[0026] The pressure regulating device 12 includes a pressure reducing valve 121 and a pressure controller 122, the two ends of the pressure reducing valve 121 are connected with the gas storage device 11 and the pressure controller 122 through pipelines respectively, the pressure reducing valve 121 is used for reducing the pressure of the arc extinguishing gas output by the gas storage device 11, and outputting the pressure-reduced arc extinguishing gas to the pressure controller 122; the pressure controller 122 is connected with the arc extinguishing switch device 2, for outputting arc extinguishing gas with stable pressure to the arc extinguishing switch device 2, which can better realize arc extinguishing work.

[0027] In the embodiment, the gas storage device 11 is set to have a gas storage pressure of 6 MPa, the pressure reducing valve 121 is used to reduce the arc extinguishing gas at 6 MPa to the arc extinguishing gas at 1.5 MPa, and the pressure controller 122 is used to stabilize the arc extinguishing gas at 1.5 MPa to the arc extinguishing gas at 0.5 MPa; when the arc extinguishing switch device 2 is opened, the arc extinguishing gas will blow to the moving area 6 between the moving and static contacts 5 due to the pressure difference, so as to extinguish the arc that may be generated in the moving area 6. It should be noted that the above-mentioned pressure values are not limited to this, and can be adjusted according to the actual design environment of the circuit breaker to ensure the normal operation and safety of the circuit breaker.

[0028] Preferably, the arc extinguishing switch device 2 is a high-frequency electromagnetic valve, so as to reduce the switch response time and improve the arc extinguishing efficiency. In the embodiment, the response time of the high-frequency electromagnetic valve is less than 3 ms, but is not limited to this.

[0029] Preferably, the signal acquisition device 3 comprises a current acquisition sensor 31 and / or a voltage acquisition sensor 32.

[0030] Preferably, the main control device 4 comprises an MCU module, and the MCU module is provided with a memory to store and process the acquired circuit signals.

[0031] Preferably, the gas storage device 11 is a high-pressure gas cylinder, but is not limited to this.

[0032] As shown in Figure 3 The utility model also provides a circuit breaker which comprises a circuit breaker body 7 and the circuit breaker gas blowing arc extinguishing device 8.

[0033] In conclusion, the utility model can acquire the circuit signals of the circuit breaker in real time, can control the switch state of the arc extinguishing switch device at the optimal time point according to the circuit zero-crossing detection result, can spray the arc extinguishing gas to the moving area between the moving and static contacts of the circuit breaker in time, and can close the arc extinguishing switch device after arc extinguishing, so as to realize high-precision arc extinguishing work, can effectively improve the arc extinguishing efficiency, can reduce the contact wear and electromagnetic interference, and can improve the reliability and safety of the circuit breaker.

[0034] Finally, it should be noted that: the above-described embodiments, only for the specific embodiments of the present application, to illustrate the technical solutions of the present application, rather than limit it, the scope of protection of the present application is not limited to this, although the foregoing detailed description of the present application is made by referring to the prior art, those skilled in the art should understand: any familiar with the technical field of the technical person within the scope of the present application disclosed by the technology, it still can be modified or easily thought of changes to the technical solutions recorded in the foregoing examples, or part of the technical features of the equivalent replacement; and these modifications, changes or replacement, and do not make the corresponding technical solutions of the essence of the present application out of the scope of the embodiments of the technical solutions, all should be covered in the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.

Claims

1. A circuit breaker gas blast arc extinguishing device, characterized by, The device comprises a pressure regulating air supply device, an arc extinguishing switch device, a signal acquisition device and a main control device. The pressure regulating air supply device is connected with the air inlet end of the arc extinguishing switch device, and is used for outputting arc extinguishing gas to the arc extinguishing switch device. The air outlet end of the arc extinguishing switch device corresponds to the moving area between the moving and static contacts of the circuit breaker, and is used for spraying the arc extinguishing gas to the moving area. The signal acquisition device is connected with the power supply circuit of the moving and static contacts, and is used for acquiring voltage signals and / or current signals of the circuit breaker. The main control device is connected with the signal acquisition device and the arc extinguishing switch device respectively, and is used for controlling the switch state of the arc extinguishing switch device according to the voltage signals and / or current signals sent by the signal acquisition device.

2. The circuit breaker blast-off arc extinguishing device of claim 1, wherein, The pressure regulating air supply device comprises a gas storage device and a pressure regulating device. The pressure regulating device is connected with the gas storage device and the arc extinguishing switch device respectively, and is used for adjusting the gas pressure of the arc extinguishing gas and outputting the pressure-regulated arc extinguishing gas to the arc extinguishing switch device.

3. The circuit breaker blast-off arc extinguishing device of claim 2, wherein, The pressure regulating device comprises a pressure reducing valve and a pressure controller. The pressure reducing valve is connected with the gas storage device and the pressure controller respectively, and is used for reducing the pressure of the arc extinguishing gas output by the gas storage device and outputting the pressure-reduced arc extinguishing gas to the pressure controller.

4. The circuit breaker blast-off arc extinguishing device according to any one of claims 1 to 3, characterized in that, The pressure controller is connected with the arc extinguishing switch device, and is used for outputting arc extinguishing gas with stable pressure to the arc extinguishing switch device.

5. The circuit breaker blast-off arc extinguishing device according to any one of claims 1 to 3, characterized in that, The arc extinguishing switch device is a high-frequency electromagnetic valve.

6. The circuit breaker blast-off arc extinguishing device according to any one of claims 1 to 3, characterized in that, The signal acquisition device comprises a current acquisition sensor and / or a voltage acquisition sensor.

7. The circuit breaker gas blast arc extinguishing device of any one of claims 2 to 3, wherein, The main control device comprises an MCU module.

8. A circuit breaker characterized by, The gas storage device is a high-pressure gas cylinder. The device comprises a circuit breaker body and the circuit breaker arc extinguishing device according to any one of claims 1 to 7, and the circuit breaker arc extinguishing device is arranged in the circuit breaker body.

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