CN212209395U - Tripping system for molded case circuit breaker - Google Patents

Abstract

The utility model provides a tripping system for a molded case circuit breaker, which comprises an actuating mechanism for pressing down a tripping button on a molded case circuit breaker panel, and a measurement and control device for collecting fault information on the load side of the molded case circuit breaker and controlling the actuating mechanism; the measurement and control device collects fault information of a load side of the molded case circuit breaker, and after the fault information is analyzed and processed by the measurement and control device, when the fault information collected by the measurement and control device meets a preset tripping condition, the control execution mechanism presses down a tripping button of the molded case circuit breaker, so that the molded case circuit breaker trips. The advantages are that: the common molded case circuit breaker without the tripping control function such as the leakage protection tripping function can be transformed into the circuit breaker with the leakage protection tripping function, and the method is simple to implement, low in cost and easy to popularize.

Description

Tripping system for molded case circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus protects technical field, concretely relates to tripping operation protection system of moulded case circuit breaker.

Background

The common molded case circuit breaker does not have a tripping control function, such as a leakage protection tripping function, and needs to be replaced by the common molded case circuit breaker without the leakage protection tripping function to solve the problem of safe power utilization of a low-voltage line, particularly the problem of personal electric shock.

Most ordinary moulded case circuit breakers are tripolar, and earth leakage circuit breaker is the quadrupole, consequently changes the ordinary moulded case circuit breaker on-the-spot into the earth leakage circuit breaker of quadrupole very difficult, need change female arranging, will change whole block terminal (cabinet) even, and the cost is very high, and will change moulded case circuit breaker into the circuit breaker that has the separating brake function, if the circuit breaker outside installs the electricity behaviour mechanism additional, then with high costs, bulky, and trip response time is long.

Therefore, it is a significant matter to modify a general molded case circuit breaker into a circuit breaker having a trip control function, such as a circuit breaker having an earth leakage protection trip function, with a simple and low-cost scheme.

Disclosure of Invention

In order to achieve the above object, the present invention provides a trip system for a molded case circuit breaker, comprising an actuating mechanism for pressing down a trip button on a panel of the molded case circuit breaker, and a measurement and control device for controlling the actuating mechanism;

furthermore, the measurement and control device comprises a main processing unit, a power supply unit and a control interface, wherein the main processing unit is connected with the power supply unit and the control interface, the control interface is connected with an actuating mechanism, and the main processing unit controls the actuating mechanism to press down a tripping button of the molded case circuit breaker.

Optionally, the measurement and control device further comprises a current sampling unit and a current transformer, wherein the current sampling unit is connected with the main processing unit and a secondary line of the current transformer to collect current fault information of a load side of the molded case circuit breaker.

Further, the actuating mechanism is installed on a panel of the molded case circuit breaker.

Further, the actuating mechanism comprises a power element, and when the fault information acquired by the measurement and control device meets a preset tripping condition, the power element of the actuating mechanism is controlled, so that the actuating mechanism presses down a tripping button of the molded case circuit breaker.

Furthermore, the power element of the actuating mechanism is an electromagnetic pull rod, an electromagnetic push rod or a motor.

The utility model has the advantages that: through setting up measurement and control device and actuating mechanism to ordinary moulded case circuit breaker, can reform transform the ordinary moulded case circuit breaker who does not possess the tripping operation function into the circuit breaker that has the tripping operation function of control, and implement simply, with low costs, easily popularization.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1: the utility model provides a measurement and control device principle schematic diagram suitable for this system.

FIG. 2: the utility model provides an actuating mechanism principle sketch map one suitable for this system.

FIG. 3: the utility model provides an outside schematic diagram suitable for actuating mechanism of this system.

FIG. 4: the utility model provides a power component action principle sketch map suitable for this system's actuating mechanism.

FIG. 5: the utility model provides an actuating mechanism principle schematic diagram two suitable for this system.

FIG. 6: the utility model provides an installation schematic diagram one suitable for actuating mechanism and moulded case circuit breaker of this system.

FIG. 7: the utility model provides an installation schematic diagram two suitable for actuating mechanism and moulded case circuit breaker of this system.

FIG. 8: the utility model provides a measurement and control device suitable for this system is to actuating mechanism's power component control principle schematic diagram.

FIG. 9: the utility model provides a use of measurement and control device, actuating mechanism and circuit breaker suitable for this system indicates.

Description of the reference numerals

1. The device comprises a measurement and control device, 1-1 current transformer, 1-2 current sampling unit, 1-3 main processing unit, 1-4 power supply unit, 1-5 control interface, 2 actuator, 2-1 power element, 2-1-1 permanent magnet, 2-1-2 coil, 2-1-3 movable iron core, 2-1-4 motor, 2-1-5 conversion module, 2-1-6 screw, 2-1-7 screw sleeve, 2-1-8 connecting piece, 2-2 power output connecting rod, 2-3 transmission element, 2-4 transmission element fixed rotating shaft, 2-5 press element, 2-6 manual button, 2-7 control connecting wire, 2-8 parts of a protective shell, 2-8-1 parts of a fixing screw, 3 parts of a molded case circuit breaker and 3-1 parts of a tripping button.

Detailed Description

The objects, features and advantages of the present invention will be realized and attained by the means of the instrumentalities and methods particularly pointed out in the appended claims. It should be noted that, in the embodiment of the present invention, all directional indicators are as follows: "up", "down", "left" and "right" are used only to explain the relative positional relationship between the respective components, the movement, and the like in a certain posture (as shown in the drawing), and if the certain posture is changed, the directional indication is changed accordingly. In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; "coupled" may be mechanical or electrical, and may be directly coupled or indirectly coupled through intervening elements, and may be internal to or interactive with respect to the two elements. Unless otherwise specifically limited, the specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

The utility model provides a pair of a tripping operation system for moulded case circuit breaker, refer to fig. 9, contain actuating mechanism 2 that is used for going on pushing down to the trip button on the moulded case circuit breaker panel, have the current acquisition to moulded case circuit breaker load side and carry out the measuring and control device 1 that controls to actuating mechanism.

Referring to fig. 1, the measurement and control device 1 includes: the device comprises a current transformer 1-1, a current sampling unit 1-2, a main processing unit 1-3, a power supply unit 1-4 and a control interface 1-5.

The connection relationship is as follows:

the secondary side of the current transformer 1-1 is connected with the current sampling unit 1-2, the current sampling unit 1-2 is connected with the main processing unit 1-3, the main processing unit 1-3 analyzes data collected by the current sampling unit 1-2, the power supply unit 1-4 supplies power to the main processing unit 1-3, and the main processing unit 1-3 controls output signals of the control interface 1-5.

Referring to fig. 9, a phase line a, a phase line B, a phase line C of the outlet end of the molded case circuit breaker 3 and a zero line N forming a loop with the phase line C pass through the current transformer 1-1 together, so that the current sampling of the circuit breaker by the measurement and control device 1 can be completed. In the present embodiment, the current refers to the leakage current for the convenience of understanding of the embodiment.

Referring to fig. 2 and 3, the actuator 2 includes: the device comprises a power element 2-1, a power output connecting rod 2-2, a transmission element 2-3, a transmission element fixing rotating shaft 2-4, a pressing element 2-5, a manual button 2-6, a control connecting line 2-7 and a protective shell 2-8; the transmission element fixing rotating shaft 2-4 is fixed on the protective shell 2-8, so that the transmission element 2-3 performs power conversion in a lever mode; one end of the transmission element 2-3 is in contact relation with the power output connecting rod 2-2, and the other end of the transmission element 2-3 is provided with a pressing element 2-5; the manual buttons 2-6 are provided on the protective housing.

The implementation process of the actuating mechanism 2 is as follows:

first, in this implementation, a mechanism of an electromagnetic pull rod is used as a power output element of the actuator.

After the actuating mechanism 2 obtains a control signal through the control connecting wire 2-7, the power element 2-1 pulls the power output connecting rod 2-2 to move towards the power element 2-1 under the action of electromagnetic force, and in the moving process, one end of the transmission element 2-3 is driven to move upwards, and the lever principle shows that when one end of the transmission element 2-3 moves upwards, the other end of the transmission element necessarily moves downwards, so that the downward movement of the pressing element 2-5 can be realized.

When the manual button 2-6 is pressed down by an external force, the downward movement of the pressing member 2-5 can be also driven.

Referring to fig. 4, the power element 2-1 is composed of a permanent magnet 2-1-1, a coil 2-1-2 and a movable iron core 2-1-3, and when a current flows through the coil 2-1-2, the movable iron core 2-1-3 can be changed into an electromagnet, and by changing the direction of the current, the electromagnetic polarity of the movable iron core 2-1-3 can be changed.

When the T1 end of the coil is connected with the negative V-of the power supply and the T2 end of the coil is connected with the positive V + of the power supply, the current flows from the T2 to the T1, the left end of the movable iron core is the S pole, the right end of the movable iron core is the N pole, the movable iron core can be attracted with the permanent magnet according to the opposite attraction principle, and the movable iron core moves towards the left end.

On the contrary, when the end T1 of the coil 2-1-2 is connected to the positive electrode V + of the power supply and the end T2 of the coil 2-1-2 is connected to the negative electrode V-of the power supply, the current flows from T1 to T2, the left end of the movable iron core is the N pole and the right end is the S pole, and the movable iron core is separated from the permanent magnet according to the principle that like poles repel each other, that is, the movable iron core moves to the right end.

The power output of the power element 2-1 is realized through the movement of the movable iron core 2-1-3, when the movable iron core 2-1-3 moves towards the left end, the power output state of the power element 2-1 is realized, and by combining with the figure 2, the power element 2-1 pulls the power output connecting rod 2-2 to move leftwards, so that the downward movement of the pressing element 2-5 is realized; conversely, when the movable iron core 2-1-3 moves to the right end, the power element 2-1 pushes the power output connecting rod 2-2 to move to the right, so that the pressing element 2-5 moves upwards

Here, referring to fig. 5, the present invention provides another implementation manner of a power element, in which a power element 2-1 mainly includes two parts, one part is a motor 2-1-4, a screw rod 2-1-6 is fixed on a rotating shaft of the motor 2-1-4, the other part is a conversion module 2-1-5, the conversion module 2-1-5 includes a threaded sleeve 2-1-7 and a connecting member 2-1-8, the threaded sleeve 2-1-7 is connected to the screw rod 2-1-6, the threaded sleeve 2-1-7 is fixedly connected to the connecting member 2-1-8, the connecting member 2-1-8 is fixedly connected to a power output connecting rod 2-2, when the rotating shaft of the motor 2-1-4 rotates, the screw sleeve 2-1-7 is driven to do linear motion, so that the linear motion of the power output connecting rod 2-2 is realized.

As is known, the rotation of the motor is realized by means of electromagnetic force, and different rotation directions of the motor can be realized by changing the polarity of an electromagnetic field, that is, the motor rotates forwards and backwards, and the same control principle is used to enable the control connecting line 2-7 to obtain different control signals so as to realize the forward rotation and the backward rotation of the motor by combining with the implementation principle that the power element 2-1 adopts an electromagnetic pull rod mode, and then the motion is converted by the conversion module 2-1-5 so that the power output connecting rod 2-2 realizes the linear repeated motion; when the power output connecting rod 2-2 moves leftwards, one end of the transmission element 2-3 is driven to move upwards in the movement process, and the lever principle shows that when one end of the transmission element 2-3 moves upwards, the other end of the transmission element necessarily moves downwards, and then the downward movement of the pressing element 2-5 can be realized.

The connection relationship between the measurement and control device 1 and the actuating mechanism 2 is as follows: the control interface 1-5 of the measurement and control device 1 is connected with the control connecting line 2-7 of the actuating mechanism; the control of the measurement and control device 1 on the actuating mechanism 2 is realized.

As shown in fig. 6 and 7, it should be noted that fig. 6 is a schematic view showing the actual installation of the actuator 2; fig. 7 is a schematic diagram formed by removing the protective housings 2 to 8 for convenience of describing the installation state and implementation process of the actuator 2.

Referring to fig. 7, the actuator 2 is mounted on a panel of the molded case circuit breaker 3, and the push-down member 2-5 is aligned with the trip button 3-1 of the molded case circuit breaker 3.

Referring to fig. 6, the protective housing 2-8 is fixed to the circuit breaker by the fixing screw 2-8-1, that is, the actuating mechanism 2 is fixedly connected to the molded case circuit breaker 3. In fig. 6, 4 fixing screws are used for fixing, but in actual installation, the number of the fixing screws is arbitrary but at least two as long as the fixing requirements can be met.

Referring to fig. 8, two output ends of the current transformer convert a current signal into a voltage signal through a series resistor R35, and are respectively connected to a pin LAN and a pin LAP of a sampling chip U12 to perform current collection, a pin TX of the sampling chip U12 is connected to a pin PB10 of a CPU, a pin RX of the sampling chip U12 is connected to a pin PB11 of the CPU, and the collected current is sent to the CPU; a pin PA10 of the CPU is connected with a B pole of a triode Q1, a pin PA11, a B pole of a triode Q2, a pin PA12, a B pole of a triode Q3 and a pin PA13, and a B pole of a triode Q4; the C pole of the triode Q1 and the C pole of the triode Q2 are connected to the end of the coil T1 of the power element, and the C pole of the triode Q3 and the C pole of the triode Q4 are connected to the end of the coil T2 of the power element; the E pole of the triode Q1 and the E pole of the triode Q3 are connected with the positive pole V + of the power supply; the E pole of the transistor Q2 and the E pole of the transistor Q4 are connected to the negative V-pole of the power supply.

Referring to fig. 4, the CPU pin PA12 and the pin PA11 control the transistors Q3 and Q2 to conduct simultaneously, so that current flows from the T2 end to the T1 end of the coil, and the power element pulls the power output link to move leftwards.

The CPU pin PA10 and the pin PA13 control the conduction of the transistors Q1 and Q4 at the same time, so that the current flows from the T1 end to the T2 end of the coil, and the power element pushes the power output connecting rod to move rightwards.

Thereby realizing the power output conversion of the power element 2-1.

Specifically, referring to fig. 9, an outgoing line phase line a, a phase line B, a phase line C of the molded case circuit breaker 3 and a zero line N forming a loop therewith pass through the current transformer 1-1 together.

The actuating mechanism 2 is arranged on a circuit breaker, and a power supply connecting wire 2-7 of the actuating mechanism 2 is connected with a control interface 1-5 of the measurement and control device 1.

When the current amplitude acquired by the measurement and control device 1 meets the preset tripping condition, a corresponding control signal is output to the control connecting line 2-7, so that the power element 2-1 of the actuating mechanism 2 outputs required actuating power, the power transmission connecting rod 2-2 is pulled to move leftwards, and the downward pressing element 2-5 is enabled to press the tripping button 3-1 of the molded case circuit breaker 3 through the internal power conversion of the actuating mechanism, and finally the leakage tripping of the molded case circuit breaker 3 is realized.

After the electric leakage tripping is realized, opposite control signals can be output to the control connecting line 2-7, so that the power element 2-1 pushes the power transmission connecting rod 2-2 to move rightwards, and the downward pressing element 2-5 is separated from the tripping button 3-1 of the molded case circuit breaker 3 through the internal power conversion of the executing mechanism, thereby facilitating the switching-on of the molded case circuit breaker.

Of course, the utility model provides a technical scheme not only is applicable to the earth leakage tripping operation protection who solves moulded case circuit breaker, still is applicable to the other fault protection of circuit breaker equally, if gather fault information such as voltage, zero line electric current, can solve moulded case circuit breaker's overvoltage protection, zero line overcurrent protection tripping operation equally.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, so as to better explain the principles and practical applications of the present invention, and thereby to enable those skilled in the art to better understand and utilize the present invention. The invention is not limited to the scope of the invention, and all the equivalent structural changes made by the contents of the specification and the drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (5)

1. A trip system for a molded case circuit breaker, characterized by: the device comprises an actuating mechanism and a measurement and control device, wherein the actuating mechanism is used for pressing a tripping button on a molded case circuit breaker panel; the measurement and control device comprises a main processing unit, a power supply unit and a control interface, wherein the main processing unit is connected with the power supply unit and the control interface, and the control interface is connected with an actuating mechanism, so that the measurement and control device controls the actuating mechanism to press down a tripping button of the molded case circuit breaker.

2. The trip system of claim 1, wherein the measurement and control device further comprises a current sampling unit and a current transformer, the current sampling unit is connected to the main processing unit and a secondary line of the current transformer for collecting the current fault information of the load side of the molded case circuit breaker.

3. The trip system for a molded case circuit breaker according to claim 1, wherein the actuator is mounted on a faceplate of the molded case circuit breaker.

4. The trip system of claim 1, wherein the actuator comprises a power element, and when the fault information collected by the measurement and control device satisfies a predetermined trip condition, the power element of the actuator is controlled such that the actuator pushes down a trip button of the molded case circuit breaker.

5. The trip system for molded case circuit breakers of claim 4, wherein the power element of the actuator is an electromagnetic pull rod, or an electromagnetic push rod, or a motor.

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