阅读说明：本技术 真空断路器的动作感测装置以及包括其的真空断路器 (Action sensing device of vacuum circuit breaker and vacuum circuit breaker comprising same ) 是由 崔镕珍 于 2020-03-09 设计创作，主要内容包括：本发明涉及真空断路器的动作感测装置以及包括其的真空断路器。本发明的真空断路器设置有与真空灭弧室的可动电极结合并且使所述可动电极上升或下降的推杆组件,所述动作感测装置的特征在于,包括：传感器模块,与所述推杆组件隔开设置,配置为面向所述杆罩体的一侧；以及感测部,设置于所述推杆组件的一侧,配置为面向所述传感器模块；所述传感器模块感测所述感测部的移动。(The present invention relates to an action sensing device of a vacuum circuit breaker and a vacuum circuit breaker comprising the same. The vacuum circuit breaker of the present invention is provided with a push rod assembly combined with a movable electrode of a vacuum arc-extinguishing chamber and making the movable electrode ascend or descend, and the action sensing device is characterized by comprising: a sensor module disposed spaced apart from the push rod assembly and configured to face one side of the lever cover body; and a sensing part disposed at one side of the push rod assembly and configured to face the sensor module; the sensor module senses movement of the sensing part.)

1. A motion sensing apparatus of a vacuum circuit breaker provided with a push rod assembly combined with a movable electrode of a vacuum interrupter and ascending or descending the movable electrode, wherein the motion sensing apparatus comprises:

a sensor module disposed spaced apart from the push rod assembly and configured to face one side of the lever cover body; and

a sensing part disposed at one side of the push rod assembly and configured to face the sensor module;

the sensor module senses movement of the sensing part.

2. The motion sensing apparatus of the vacuum circuit breaker according to claim 1,

the sensing part includes:

a slit body coupled to one side of the lever cover body in a length direction;

the slit plate is formed by protruding from the outer plate surface of the slit main body along the length direction;

a plurality of sensing slits formed through the slit plate.

3. The motion sensing apparatus of the vacuum circuit breaker according to claim 2,

the sensing unit is disposed in a direction facing the plate surface of the slit plate.

4. The motion sensing apparatus of the vacuum circuit breaker according to claim 2,

the sensing slits are formed in plural at predetermined intervals along a longitudinal direction of the slit plate.

5. The motion sensing apparatus of the vacuum circuit breaker according to claim 2,

the slit main body has a curved surface shape having a curvature corresponding to a curvature of an outer peripheral surface of the lever cover body.

6. The motion sensing apparatus of the vacuum circuit breaker according to claim 5,

the slit main body is inserted into the inside of the lever cover body, and the slit plate protrudes toward the outside of the lever cover body in a state where the slit main body is inserted into the lever cover body.

7. The motion sensing apparatus of the vacuum circuit breaker according to claim 6,

the lever cover body comprises:

an insertion slit formed to penetrate one side of an outer circumferential surface of the lever cover body, one end side of the lever cover body being open and formed along a longitudinal direction of the lever cover body, the slit body being inserted into the insertion slit; and

and a slit hole cut along a length direction of the insertion slit, through which the slit plate is exposed.

8. The motion sensing apparatus of the vacuum circuit breaker according to claim 7,

the length of the insertion slit is greater than the length of the slit body.

9. The motion sensing apparatus of the vacuum circuit breaker according to claim 7,

the push rod component also comprises a fixed part,

the fixing part is coupled to one end of the lever cover body to close an open end of the insertion slit, and a hollow annular shape through which the push rod is inserted is formed.

10. The motion sensing apparatus of the vacuum circuit breaker according to claim 2,

the sensor module includes:

a light emitting section that is arranged in a direction facing the slit plate and emits light toward the slit plate;

a light receiving unit arranged in parallel with the light emitting unit and receiving light reflected from the slit plate; and

and a circuit unit coupled to the light emitting unit and the light receiving unit, and configured to output an output signal according to an amount of light received from the light receiving unit.

11. The motion sensing apparatus of the vacuum circuit breaker according to claim 1,

the sensing part includes:

a body disposed along a longitudinal direction at one side of the lever cover body, and coupled to an inner side of the lever cover body; and

and a plurality of protrusions formed on the outer circumferential surface of the body to protrude in a length direction.

12. The motion sensing apparatus of the vacuum circuit breaker according to claim 1,

the sensing part includes:

a body disposed along a longitudinal direction at one side of the lever cover body and coupled to an outer circumferential surface of the lever cover body;

and a plurality of protrusions formed on the outer circumferential surface of the body to protrude in a length direction.

13. The motion sensing apparatus of the vacuum circuit breaker according to claim 11 or 12, wherein,

the sensing portion is disposed in a direction facing the protrusion or a direction facing one side of the protrusion.

14. A vacuum interrupter, comprising:

a vacuum interrupter including a fixed electrode fixed in an insulating container and provided with a fixed contact at one end and a movable electrode provided with a movable contact at one end to be in contact with or separated from the fixed contact, the movable electrode being provided to be capable of ascending or descending in the insulating container;

a main circuit part provided with a cover body accommodating the vacuum arc-extinguishing chamber;

a push rod assembly provided with a push rod combined with the other end of the movable electrode and causing the movable electrode to ascend or descend, and a rod cover body accommodating one end of the push rod; and

a motion sensing device provided with a sensor module disposed spaced apart from the push rod assembly and configured to face one side of the lever cover body, and a sensing part disposed at one side of the push rod assembly and configured to face the sensor module, the sensor module sensing movement of the sensing part.

15. The vacuum interrupter of claim 14,

the sensing part includes:

a slit body coupled to one side of the lever cover body in a length direction;

the slit plate is formed by protruding from the outer plate surface of the slit main body along the length direction;

a plurality of sensing slits formed through the slit plate.

16. The vacuum interrupter of claim 15,

the sensor module includes:

a light emitting section that is arranged in a direction facing a plate surface of the slit plate and emits light toward the slit plate;

a light receiving unit arranged in parallel with the light emitting unit and receiving light reflected from the slit plate; and

and a circuit unit coupled to the light emitting unit and the light receiving unit, and configured to output an output signal according to an amount of light received from the light receiving unit.

17. The vacuum interrupter of claim 14,

the sensing part includes:

a body disposed along a longitudinal direction at one side of the lever cover body and coupled to an inner side or an outer circumferential surface of the lever cover body; and

and a plurality of protrusions formed on the outer circumferential surface of the body to protrude in a length direction.

18. The vacuum interrupter of claim 17,

the sensing portion is disposed in a direction facing the protrusion or a direction facing one side of the protrusion.

Technical Field

The present invention relates to an operation sensing device of a vacuum circuit breaker capable of sensing whether the vacuum circuit breaker is abnormal or not and performance degradation, and a vacuum circuit breaker including the same.

Background

A vacuum circuit breaker is an electrical protection device that protects load devices and lines from a fault current by using the dielectric strength of a vacuum when a fault such as a short circuit or a ground current occurs in a circuit.

The vacuum circuit breaker functions as a power transmission control and protects the power system. The vacuum circuit breaker has large breaking capacity and high reliability and safety. Furthermore, since the vacuum circuit breaker can be disposed in a small installation space, its application range is being expanded from a medium voltage to a high voltage.

Next, the structure of a general vacuum circuit breaker will be briefly described.

Fig. 1 is a partial sectional view showing a general vacuum circuit breaker.

As shown in fig. 1, a general vacuum circuit breaker 1 includes: a main circuit section 10 including a vacuum interrupter 10 a; a push rod assembly 30 and a main shaft 50 for transmitting power to the contact of the vacuum interrupter 10 a; and a mechanism assembly 70 generating a driving force and transmitting the driving force by being connected to the main shaft 50.

The vacuum interrupter 10a includes: a fixed electrode 14 fixed inside the insulating container 12; a movable electrode 16 that moves up and down inside the insulating container 12; and a fixed contact 14a and a movable contact 16a provided at the ends of the fixed electrode 14 and the movable electrode 16, respectively.

The movable contact 16a is brought into contact with the fixed contact 14a (on state) or separated from the fixed contact 14a (off state) by the movable electrode 16. The movable electrode 16 is raised and lowered by the push rod assembly 30.

The push rod assembly 30 pushes or separates the movable electrode 16. The push rod assembly 30 is elevated by the main shaft 50 transmitting power generated by the mechanism assembly 70. One end of the main shaft 50 is connected to the mechanism assembly 70 and the other end is rotated in one direction or the other to raise and lower the push rod assembly 30.

The vacuum circuit breaker 1 having the above-described structure measures the contact time or separation time of the movable contact 16a by attaching the rotation sensor 52 to the main shaft 50. By measuring whether or not the movable contact 16a operates within a predetermined time by the rotation sensor 52, the reliability of the operating characteristics of the vacuum circuit breaker can be maintained.

However, such a conventional rotation sensor has a predetermined mechanical life, and is very short compared to the mechanical life of the vacuum circuit breaker itself. Therefore, since the measurement of the contact time or the separation time by the rotation sensor depends on the mechanical life of the rotation sensor, there is a problem that it is difficult to ensure reliability when used for a long time.

Therefore, in order to ensure the reliability of the vacuum circuit breaker, it is necessary to develop a method capable of maintaining the reliability even in long-term use.

Disclosure of Invention

Problems to be solved by the invention

An object of the present invention is to provide an operation sensing device of a vacuum circuit breaker capable of sensing whether the vacuum circuit breaker is abnormal or not and performance degradation, and a vacuum circuit breaker including the same.

The object of the present invention is not limited to the above-mentioned object, and other objects and advantages of the present invention which are not mentioned can be clearly understood by those skilled in the art from the following description and can be further clearly understood by embodiments of the present invention. Further, the objects and advantages of the present invention can be easily achieved by the methods and combinations thereof as expressed in the claims.

Means for solving the problems

The present invention provides a motion sensing device for a vacuum circuit breaker provided with a push rod assembly coupled to a movable electrode of a vacuum interrupter and lifting the movable electrode, the motion sensing device including: a sensor module disposed spaced apart from the push rod assembly and configured to face one side of the lever cover body; and a sensing part disposed at one side of the push rod assembly and configured to face the sensor module; the sensor module senses movement of the sensing part.

The sensing part includes: a slit body coupled to one side of the lever cover in a length direction; a slit plate formed to protrude in a longitudinal direction from an outer plate surface of the slit body; and a plurality of sensing slits formed through the slit plate.

The sensor unit is disposed in a direction facing the plate surface of the slit plate.

The sensing slits are formed in plural at predetermined intervals along a longitudinal direction of the slit plate.

The slit body is characterized by having a curved surface shape having a curvature corresponding to a curvature of an outer peripheral surface of the lever cover body.

The slit body is inserted into the lever cover body, and the slit plate protrudes outward of the lever cover body in a state where the slit body is inserted into the lever cover body.

The lever cover body comprises: an insertion slit formed to penetrate one side of an outer circumferential surface of the lever cover body, one end side of the lever cover body being open and formed along a longitudinal direction of the lever cover body, the slit body being inserted into the insertion slit; and a slit hole cut along a length direction of the insertion slit, the slit plate being exposed through the slit hole.

The insertion slit is characterized by a length greater than the length of the slit body.

The push rod assembly further comprises a fixing part, the fixing part is combined with one end of the rod cover body to block the open end of the insertion slit, and a hollow ring shape for the push rod to penetrate through is formed.

The sensor module includes: a light emitting section arranged in a direction facing the slit plate and emitting light toward the slit plate; a light receiving unit arranged in parallel with the light emitting unit and receiving light reflected from the slit plate; and a circuit unit coupled to the light emitting unit and the light receiving unit, and configured to output an output signal according to an amount of light received from the light receiving unit.

The sensing part includes: a body disposed along a longitudinal direction at one side of the lever cover body, and coupled to an inner side of the lever cover body; and a plurality of protrusions formed on the outer circumferential surface of the body to protrude in a length direction.

The sensing part includes: a body disposed along a longitudinal direction at one side of the lever cover body and coupled to an outer circumferential surface of the lever cover body; and a plurality of protrusions formed on the outer circumferential surface of the body to protrude in a length direction.

The sensing part may be disposed in a direction facing the protrusion or a direction facing one side of the protrusion.

In addition, the present invention provides a vacuum circuit breaker, comprising: a vacuum interrupter including a fixed electrode fixed in an insulating container and having a fixed contact at one end and a movable electrode having a movable contact at one end, the movable contact being in contact with or separated from the fixed contact, the movable electrode being configured to be movable up and down in the insulating container; a main circuit part provided with a cover body accommodating the vacuum arc-extinguishing chamber; a push rod assembly provided with a push rod combined with the other end of the movable electrode and lifting the movable electrode, and a rod cover body accommodating one end of the push rod; and a motion sensing device provided with a sensor module disposed apart from the push rod assembly and configured to face one side of the lever cover body, and a sensing part disposed at one side of the push rod assembly and configured to face the sensor module, the sensor module sensing movement of the sensing part.

The sensing part includes: a slit body coupled to one side of the lever cover body in a length direction; the slit plate is formed by protruding from the outer plate surface of the slit main body along the length direction; and a plurality of sensing slits formed through the slit plate.

The sensor module includes: a light emitting section that is arranged in a direction facing a plate surface of the slit plate and emits light to the slit plate; a light receiving unit arranged in parallel with the light emitting unit and receiving light reflected from the slit plate; and a circuit unit coupled to the light emitting unit and the light receiving unit, and configured to output an output signal according to an amount of light received from the light receiving unit.

The sensing part includes: a body disposed along a longitudinal direction at one side of the lever cover body and coupled to an inner side or an outer circumferential surface of the lever cover body; and a plurality of protrusions formed on the outer circumferential surface of the body to protrude in a length direction.

The sensing portion is characterized by being arranged in a direction facing the protrusion or a direction facing one side of the protrusion.

ADVANTAGEOUS EFFECTS OF INVENTION

The action sensing device of the vacuum circuit breaker and the vacuum circuit breaker comprising the same can sense the action characteristic of the movable contact, so that the action abnormity or performance reduction of the vacuum circuit breaker can be sensed.

In the following description of the embodiments, the specific effects of the present invention will be described together with the above-described effects.

Drawings

The action sensing device of the vacuum circuit breaker and the vacuum circuit breaker comprising the same can sense the action characteristic of the movable contact, so that the action abnormity or performance reduction of the vacuum circuit breaker can be sensed.

Hereinafter, the specific embodiments will be described together with the above effects.

Detailed Description

The foregoing objects, features and advantages will be described in detail with reference to the accompanying drawings, whereby those skilled in the art can easily embody the technical idea of the present invention. In describing the present invention, when it is judged that a detailed description of the related known art may make the gist of the present invention unclear, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components.

In the present specification, the term "upper (or lower)" or "upper (or lower)" of a component in which an arbitrary component is disposed means that the arbitrary component is disposed in contact with not only the top surface (or bottom surface) of the component but also another component may be interposed between the component and the arbitrary component disposed above (or below) the component.

When a certain constituent element is described as being "connected", "coupled", or "connected" to another constituent element, it is to be understood that the constituent element may be directly connected or connected to the other constituent element, or other constituent elements may be interposed between the constituent elements, or each constituent element may be "connected", "coupled", or "connected" to another constituent element.

Fig. 2 is a partial sectional view showing a vacuum circuit breaker to which a motion sensing device of a first embodiment of the present invention is applied. Fig. 3 is an exploded perspective view illustrating the motion sensing apparatus shown in fig. 2. Fig. 4 is an enlarged perspective view illustrating a sensing part of the motion sensing device shown in fig. 3. Fig. 5 is an exploded perspective view illustrating the sensing part shown in fig. 4. Fig. 6 is a graph showing an output waveform of the motion sensing device shown in fig. 3 and a stroke waveform of the vacuum circuit breaker.

As shown in fig. 2, an operation sensing device 800 of a vacuum circuit breaker according to an embodiment of the present invention is installed at a position where a contact state of a vacuum circuit breaker a can be confirmed, and senses a contact operation characteristic.

Next, the main structure of the vacuum circuit breaker a will be briefly described (the structure of the vacuum circuit breaker will be described only as necessary to describe the present invention).

The vacuum circuit breaker a includes: a main circuit part 100 including a vacuum interrupter 130; a push rod assembly 200 and a main shaft 300 for transmitting power to a contact of the vacuum interrupter 130; and a mechanism assembly 400 connected to the main shaft 300 to transmit a driving force. The aforementioned vacuum circuit breaker a is constructed to be disposed on the rail assembly 700.

A vacuum interrupter 130 is provided inside the casing 110 of the main circuit unit 100. The vacuum interrupter 130 is provided with: an insulating container 132 forming an accommodating space; a fixed electrode 134 fixed to an upper inner portion of the insulating container 132; a fixed contact 134a provided at an end of the fixed electrode 134; a movable electrode 136 vertically movably provided at a lower portion inside the insulating container 132; the movable contact 136a is provided at an end of the movable electrode 136. An arc shield 132a for forming a vacuum is accommodated in the insulating container 132, and the arc shield 132a surrounds the fixed electrode 134 and the fixed contact 134a, and the movable electrode 136 and the movable contact 136 a. The movable contact 136a is brought into contact with the fixed contact 134a (on state) or separated from the fixed contact 134a (off state) by the movable electrode 136. The movable electrode 136 is elevated by the push rod assembly 200.

The push-rod assembly 200 pushes or separates the movable electrode 136. The putter assembly 200 includes: a movable rod 210 connected to the movable electrode 136; a push rod 230 connected with the main shaft 300; a lever cover 250, to the upper side of which the movable lever 210 is coupled and to the lower side of which the push rod 230 is coupled, of the lever cover 250; the push spring 270 is accommodated in the lever cover 250 and compressed or restored by the push rod 230. A main shaft 300 is connected to a lower end of the push rod 230.

The lever cover 250 has a substantially cylindrical appearance. The upper end of the lever cover 250 coupled to the movable lever 210 may have a diameter smaller than that of a portion receiving the push-in spring 270. The lever cover 250 has an open lower end, and a cylindrical accommodation space is formed inside the lever cover 250. The push-in spring 270 is inserted into the receiving space of the lever cover body 250. The push rod 230 supports the push spring 270 to prevent its detachment, and one end of the push rod 230 is fixed inside the receiving space.

The lever cover 250 may be provided with a coupling structure (to be described later) to which the sensing part 830 of the sensor module 810 is coupled.

The main shaft 300 is connected to the mechanism assembly 400 and transmits power generated by the mechanism assembly 400 to the push rod assembly 200. The spindle 300 may be in the shape of a plate (plate) having a predetermined area. One end of the main shaft 300 is rotatably coupled to a lower portion of the power transmission structure of the mechanism assembly 400. The other end of the main shaft 300 is coupled with the push rod 230. The main shaft 300 may have a shape that is smaller in size from one end coupled to the mechanism assembly 400 to the other end coupled to the push rod 230. That is, as shown in fig. 2, one side of the main shaft 300 may be in a shape similar to that of a water droplet having a larger diameter. One end of the spindle 300 on the mechanism assembly 400 side is defined as a first rotating part 310, and the other end is defined as a second rotating part 330.

The main shaft 300 is rotatably coupled to a drive link, not shown. The spindle 300 is disposed in a state of being exposed to the outside of the lower bracket 510 of the mechanism assembly 400. The first rotating part 310 of the main shaft 300 is rotated in the clockwise direction or the counterclockwise direction in the arrow direction B by the driving force from the mechanism assembly 400.

If the first rotation part 310 rotates counterclockwise, the second rotation part 330 ascends in the arrow direction C. If the push rod 230 ascends, the push spring 270 is compressed and the push rod 230 pushes the movable rod 210 to ascend. When the movable rod 210 is raised, the movable contact 136a is raised and brought into a pushed-in state in contact with the fixed contact 134 a.

In contrast, if the first rotation part 310 rotates in the clockwise direction, the second rotation part 330 descends in the arrow direction C. If the push rod 230 descends, the push spring 270 is restored and the push rod 230 descends to the home position. If the movable rod 210 is lowered, the movable contact 136a is lowered and becomes a disconnected state separated from the fixed contact 134 a.

As described above, if the movable rod 210 is lifted by the lifting of the push rod 230, the movable contact 136a is brought into contact with or separated from the fixed contact 134 a. The lever cover 250 ascends and descends together when the push lever 230 ascends and descends. The lever housing 250 is a relatively easy to access component compared to the push rod 230.

Therefore, in the present invention, the motion sensing device 800 is provided in the lever cover body 250 and a portion adjacent thereto, thereby sensing the motion state of the push rod 230. Thereby, the contact time or separation time of movable contact 136a can be sensed, and whether the operation is abnormal or the performance is degraded can be determined.

As shown in fig. 3 to 5, the motion sensing apparatus 800 includes: a sensor module 810 for sensing motion of the push rod 230; and a sensing part 830 formed on the lever cover 250 so that the sensor module 810 can sense the motion of the push rod 230. The motion sensing device 800 may be additionally provided with brackets 850 and 870 for installing the sensor module 810. The shape of the brackets 850 and 870 is not limited as long as the sensor module 810 can be coupled to the cover body 110 of the vacuum circuit breaker a.

The sensor module 810 includes: a light emitting portion 812 that emits light; a light receiving unit 814 that receives the light emitted from the light emitting unit 812; and a circuit unit 816 for controlling the light emitting unit 812 and the light receiving unit 814 and processing the signals.

The light emitting section 812 and the light receiving section 814 are arranged side by side on one surface of the circuit section 816. In addition, the sensor module 810 is disposed such that the light emitting portion 812 and the light emitting portion 814 face the lever cover body 250.

The sensor module 810 is a type of optical sensor, and the sensor module 810 emits light in the arrow direction D from the light emitting portion 812, the emitted light is reflected by the sensing portion 830 and returned, and the light receiving portion 814 senses the returned light. Therefore, as shown in fig. 4, the sensor module 810 needs to be disposed at a position where the light emitting portion 812 and the light receiving portion 814 face the push rod assembly 200 and can emit and reflect light to a sensing portion 830 (which will be described later).

Since a photocurrent proportional to the intensity of the light detected by the light receiving unit 814 flows through the circuit unit 816, the amount of current also changes according to the amount of light returned by reflection. The amount of current generated in the circuit portion 816 increases as the amount of returned light increases. The circuit portion 816 may process the photocurrent and output a current value signal or a voltage value signal converted from the current value to the outside.

Since the sensor module 810 senses the amount of incident light after the light emitted from the light emitting portion 812 is reflected, the amount of incident light to the light receiving portion 814 after the light is reflected decreases as the distance from the sensor module 810 increases. If the amount of light incident on the light receiving unit 814 decreases, the photocurrent is reduced, and thus the distance of the distance sensor module 810 can be sensed.

In addition, if no light is reflected and enters the light receiving unit 814, the photocurrent value is 0, and therefore the sensor module 810 can determine whether or not an object is present at the reflected position.

Thus, the sensing direction of the sensor module 810 is a direction in which light is emitted and reflected light is reflected. The sensor module 810 may sense displacement in the same direction as the sensing direction.

The sensor module 810 and the determination of the distance of the sensing object or the presence or absence of the sensing object may be implemented in another processing device (not shown). The processing device may be implemented by various devices that can analyze signals from the processing circuit 816, such as a separately provided controller, a user terminal, and an external server. The circuit portion 816 may transmit the processed current value to the processing device or may transmit the current value after converting it into a voltage value. Alternatively, the presence of the sensing object may be sensed by transmitting a current value from the circuit portion 816 and converting the current value into a voltage value in the processing device.

In the present embodiment, light is emitted from the light emitting portion 812 toward the sensing portion 830, and the emitted light is transmitted through the sensing portion 830 or reflected by the sensing portion 830 and enters the light receiving portion 814. That is, the sensor module 810 has the sensing unit 830 as a sensing object.

The sensing part 830 includes: a slit main body 832 provided on the outer peripheral surface of the lever cover 250; a slit plate 834 formed on the slit main body 832; and a plurality of sensing slits 834a formed on the slit plate 834. The slot body 832 may be removably coupled or secured to the lever housing 250. The sensing unit 830 reflects light emitted from the sensor module 810. Therefore, as shown in fig. 4, the sensing part 830 should be disposed at a portion facing the light emitting part 812 and the light receiving part 814 of the sensor module 810. More specifically, the light emitting part 812 and the light receiving part 814 of the sensor module 810 are arranged to face the plate surface of the slit plate 834.

The slit body 832 has a plate (plate) shape having a prescribed thickness and length, and is inserted into the lever cover body 250. A slit plate 834 is formed to protrude from one side of the slit main body 832, and a sensing slit 834a is formed in the slit plate 834. That is, the connecting shape of the slit main body 832 and the slit plate 834 has a substantially "T" shape. Therefore, in a state where the slit main body 832 and the lever cover body 250 are coupled, only the slit plate 834 protrudes outward of the lever cover body 250.

To this end, the slit main body 832 may be a curved surface shape curved to have a curvature corresponding to that of the lever cover body 250. That is, the cross-section of the slit body 832 may be streamlined and the inner and outer circumferential surfaces thereof have a curvature corresponding to that of the lever cover body 250.

Since the slit main body 832 has a thickness, the lever cover 250 has a thickness that enables the slit main body 832 to be sufficiently inserted. A slit plate 834 is formed on the outer circumferential surface of the slit main body 832 to protrude in the longitudinal direction.

The slit plate 834 has a bar shape protruding outward in a vertical direction from an outer circumferential surface of the slit main body 832. A plurality of sensing slits 834a formed to penetrate in the longitudinal direction are formed on the plate surface of the slit plate 834.

Referring to fig. 5, the sensing slit 834a is provided with a plurality of horizontal slits. The sensing slits 834a are formed through the slit plate 834 at the same intervals. In the present embodiment, the interval between the sensing slits 834a (the longitudinal interval of the slit plate) may be larger than the width of the sensing slits 834a (the longitudinal width of the slit plate).

The light emitted from the light emitting part 812 is reflected by the slit plate 834 and then enters the light receiving part 814, and passes through the sensing slit 834a if it encounters the sensing slit 834 a. Therefore, the signals generated in the circuit portion 816 are different (this will be described later).

On the other hand, a coupling structure for coupling the sensing part 830 is formed at the lever cover body 250.

As shown in fig. 5, the insertion slit 252 is formed by cutting a portion (hereinafter, referred to as a spring housing portion) of the lever cover body 250 in which a housing space is formed, and the slit main body 832 of the sensing portion 830 is inserted into the insertion slit 252. In a state where the slit main body 832 is inserted into the insertion slit 252, the push-in spring 270 and the push rod 230 are coupled. In a state where the slit main body 832, the push-in spring 270, and the push rod 230 are coupled to the lever cover 250, the coupling fixing part 290 prevents the slit main body 832 from being detached.

The insertion slit 252 is formed on the wall surface of the lever cover 250 so as to penetrate in the longitudinal direction of the push rod 230. That is, the insertion slit 252 is formed between the inner circumferential surface and the outer circumferential surface of the lever cover body 250 forming the spring housing portion 250 a. The insertion slit 252 has a shape and a size corresponding to the shape of the slit main body 832 so that the slit main body 832 can be inserted.

One end of the insertion slit 252 is connected to the open end of the spring housing portion 250a and is in an open state. The other end of the insertion slit 252 is in contact with one side of the slit main body 832, thereby preventing movement of the slit main body 832.

Further, a slit hole 252a is formed by cutting the insertion slit 252 so that the slit plate 834 can be exposed to the outside of the lever cover body 250. The slit hole 252a is formed to have a length enough to expose the slit plate 834.

With the above-described structure, the slit main body 832 is inserted upward in the longitudinal direction from the open end side of the insertion slit 252 and then fixed by the fixing portion 290. At this time, the slit plate 834 is exposed to the outside of the slit hole 252 a.

After the push-in spring 270 and the push rod 230 are coupled in a state where the slit body 832 is inserted into the insertion slit 252, the fixing portion 290 is inserted into and fixed to the lever cover 250. The fixing portion 290 has a plug shape in which a ring shape is formed to penetrate through the center thereof and a part of the body is protruded to be inserted into the spring receiving portion 250 a. Preferably, the hollow has a size that does not impede the movement of the push rod 230. The fixing portion 290 is coupled to the lever cover 250 to prevent the slit body 832 from being removed to the outside of the insertion slit 252.

The protruding portion of the fixing portion 290 has a predetermined thickness and may have an outer diameter corresponding to the inner diameter of the lever cover body 250.

Hereinafter, a method for sensing and monitoring the contact operation characteristic by the operation sensing device of the vacuum circuit breaker according to the embodiment of the present invention having the above-described configuration will be described in detail.

When the push rod 230 is raised toward the upper side of fig. 2 by the driving of the main shaft 300, the sensor module 810 indirectly senses the position of the push rod 230 by sensing the position of the sensing part 830 mounted to the lever cover body 250.

Although light is continuously emitted from the light emitting portion 812 of the sensor module 810, the sensing portion 830 located in the sensing direction of the emitted light has a sensing slit 834a, and thus reflects or transmits the light.

When the lever cover 250 is moved up by the movement of the push rod 230, light sequentially reaches the sensing slit 834a disposed at the upper end of the slit plate 834. The light is transmitted through the sensing slits 834a, and the slit plates 834 between the sensing slits 834a are in a closed state, so that the light is reflected by the slit plates 834. Therefore, while the lever cover 250 is being raised, the light emitted from the light emitting portion 812 is transmitted and blocked repeatedly in this order, and thus a curve as shown in fig. 6 is derived.

As shown in fig. 6, when the light emitted from the light emitting portion 812 is blocked by the plate surface of the slit plate 834, the light is reflected and enters the light receiving portion 814 of the sensor module 810. Therefore, the output voltage of the sensor module 810 maintains a predetermined value while the light is reflected. If the light emitted from the light emitting portion 812 reaches the sensing slit 834a via the plate surface of the slit plate 834, the light passes through the sensing slit 834 a. Therefore, no light is reflected and enters the light receiving unit 814, and the output voltage of the sensor module 810 becomes 0. During the light pass, the output voltage of the sensor module 810 continues to be 0.

Since the sensing slits 834a are formed at the slit plate 834 at predetermined intervals, a section in which the output voltage is a predetermined value and a section in which the output voltage is zero are repeated. Therefore, the output voltage of the sensor module 810 takes the form of a curve on the upper side of fig. 6.

The push rod 230 is operated by the spindle 300, and the movable electrode 136 is driven by the push rod 230. Since the end of the movable electrode 136 is provided with the movable contact 136a, the operation of the spindle 300 is interlocked with the operation of the movable electrode 136. Therefore, the stroke curve of the movable contact 136a (lower curve in fig. 6) can be obtained from the output voltage waveform curve of the sensor module 810 by the interval (distance) of the sensing slit 834 a. The stroke of the movable contact 136a refers to the speed at which the movable contact 136a strikes the fixed contact 134 a.

In this way, since the operating characteristics of movable contact 136a can be monitored in the normal operating state, if a curve different from the normal operating state is derived, the controller or the user can determine that a problem situation such as a contact abnormality has occurred.

When an abnormality or a performance degradation occurs in the operation of the spindle 300, the plunger 230, or the movable contact 136a, the output voltage waveform interval per unit time of the sensor module 810 or the inclination of the stroke curve of the movable contact 136a changes. Therefore, the motion sensing device 800 of the present invention can sense the abnormal motion or the performance degradation of the spindle 300, the push rod 230, and the movable contact 136 a.

The sensor module 810 may continuously monitor the operation of the sensing part 830, or may operate only when the contacts are contacted.

In the above-described embodiment, the configuration in which the light emitting portion 812 and the light receiving portion 814 of the sensor module 810 are both provided on the circuit portion 816 and provided so as to face the sensing portion 830 has been described. However, the light emitting portion 812 and the light receiving portion 814 may be arranged to face each other with the sensing portion 830 interposed therebetween.

In the above embodiment, the case where the sensing portion is in the form of a slit is described. However, the sensing portion may be implemented in other forms (hereinafter, the description about the same constitution as the foregoing embodiment will be omitted).

Fig. 7 is an exploded perspective view showing a motion sensing device of a second embodiment of the present invention. Fig. 8 is an exploded perspective view showing a motion sensing device of a third embodiment of the present invention. Fig. 9 is a graph showing an output waveform of the motion sensing device shown in fig. 7 and 8 and a stroke waveform of the vacuum circuit breaker.

As shown in fig. 7, a motion sensing apparatus 800 according to a second embodiment of the present invention includes a sensor module 810 and a sensing portion 830 'that are the same as those of the first embodiment, and the sensing portion 830' is constituted by a main body 832 'and a protrusion 834'.

The main body 832' has the same shape as the slit main body 832 of the first embodiment, and has a plate shape having the same curvature as the curvature of the outer circumferential surface of the lever cover body 250. A plurality of protrusions 834 'formed along the longitudinal direction of the slit hole 252a are formed on the outer circumferential surface of the body 832' in a protruding manner.

The protrusion 834 'may protrude from the plate surface of the main body 832' in the shape of a rectangular parallelepiped or a regular hexahedron. The projections 834' have a predetermined size and are arranged in plural at predetermined intervals.

As in the first embodiment, the body 832 'is inserted into the slit hole 252a of the insertion slit and the protrusion 834' protrudes outside the slit hole 252 a.

Alternatively, as shown in fig. 8, the main body 832 ″ may be formed long so as to surround the outer circumferential surface of the lever cover 250. In this case, the main body 832 ″ is not inserted into the insertion slit 252 of the lever cover 250 but coupled to the outer circumferential surface of the lever cover 250. Therefore, the lever cover body 250 is in a form without the insertion slit 252. At this time, the shape of the protrusion 834 ″ may be the same as that of the second embodiment.

The sensing parts 830 of the second and third embodiments of the present invention may also be configured such that the sensor module 810 faces the sensing parts 830 ', 830 "and faces the sides of the protrusions 834', 834" as shown in fig. 4.

In the sensing parts 830 ', 830 "of the second and third embodiments of the present invention, the gap portions of the protrusions 834 ', 834" transmit light, and the protrusions 834 ', 834 "are in a closed state to reflect light. Therefore, while the lever cover 250 is being raised, the light emitted from the light emitting portion 812 passes through and blocks the light in order, and thus the curve shown in fig. 9 is derived.

Therefore, similarly to the first embodiment, the motion sensing devices of the second and third embodiments can sense the abnormal motion or performance degradation of the spindle 300, the push rod 230, and the movable contact 136 a.

Alternatively, although not shown, the sensing parts 830 of the second and third embodiments of the present invention may be configured such that the sensor module 810 faces the sensing parts 830 ', 830 ″ and faces the front surfaces of the protrusions 834', 834 ″. At this time, there is a difference between a sensing value sensed by the sensor module 810 based on the distance from the protrusions 834 ', 834 ″ and a sensing value sensed based on the distance from a site between the protrusions 834', 834 ″. That is, since the distance from the sensor module 810 to the protrusions 834 ', 834 "is smaller than the distance to the protrusions 834', 834", the sensing value of the positions of the protrusions 834 ', 834 "may be greater than the sensing value of the portions between the protrusions 834', 834". Therefore, similarly to the first embodiment, the motion sensing devices of the second and third embodiments can sense the abnormal motion or performance degradation of the spindle 300, the push rod 230, and the movable contact 136 a.

It will be apparent to those skilled in the art that various substitutions, modifications and changes may be made to the present invention without departing from the scope of the technical spirit of the present invention, and therefore, the present invention is not limited to the foregoing embodiments and drawings.