Contact monitoring device for vacuum circuit breaker and correction method of the contact monitoring device

Abstract

The present invention relates to a contact monitoring device for a vacuum circuit breaker capable of compensating for a deviation of a sensor for monitoring contact wear caused by temperature and a correction method for the contact monitoring device. According to the present invention, the characteristic value of the optical sensor that changes according to the operating temperature is corrected in consideration of the temperature characteristics of the optical sensor, thereby enabling accurate contact wear to be sensed.

Description

Technical Field

[0001] The present invention relates to a contact monitoring device for a vacuum circuit breaker capable of compensating for deviations caused by temperature in a sensor for monitoring the amount of contact wear, and a correction method for the contact monitoring device. Background Art

[0002] A vacuum circuit breaker is an electrical device that uses the dielectric strength of a vacuum to protect load equipment and lines from fault currents in the event of an accident such as a short circuit or grounding in a circuit.

[0003] The vacuum circuit breaker plays a role in power transmission control and protection of the power system. The vacuum circuit breaker has a large breaking capacity and high reliability and safety. In addition, the vacuum circuit breaker can be placed in a space with a small installation space, so its application range is expanding from medium voltage to high voltage.

[0004] The vacuum circuit breaker includes a vacuum interrupter as a core component for interrupting current, a power transmission device for transmitting power to the vacuum interrupter, a push rod that reciprocates up and down through the power transmission device to bring the contacts in the vacuum interrupter into contact or separation, and the like. As an example of the vacuum interrupter as a core component of the vacuum circuit breaker, Korean Patent No. 10-1860348 (announcement date: May 16, 2018) is disclosed (hereinafter, the reference numerals appearing in the description of the prior art vacuum interrupter are only for the description of the prior art).

[0005] The existing vacuum interrupter 100 disclosed in the aforementioned prior art document includes an insulating container 190, a fixed electrode 110, a movable electrode 150, and an arc shield 210. Fixed contacts 130 and movable contacts 170 are respectively provided on the fixed electrode 110 and the movable electrode 150. According to the up and down movement of the movable electrode 150, the movable contact 170 is brought into contact with or separated from the fixed contact 130.

[0006] Regarding the fixed contact 130 and the movable contact 170, there is a problem that the contacts are worn due to repeated current interruption operations. If the wear of the contacts reaches a level above a specified level, repair or replacement is required. If the repair or replacement of the contacts is not timely, it will cause a decrease in the short-term performance, short-circuit performance, and current-carrying performance of the vacuum interrupter. Therefore, it is necessary to sense the accurate contact wear state.

[0007] In addition, even if a sensor is used to sense the wear state of the contacts, the characteristics of the sensor change according to the operating temperature. Therefore, a correction method for accurately correcting it to derive a reliable sensing result is also required. Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] An object of the present invention is to provide a contact monitoring device for a vacuum circuit breaker that can compensate for deviations caused by temperature in a sensor for monitoring the amount of contact wear, and a correction method for the contact monitoring device.

[0010] The object of the present invention is not limited to the above-mentioned object. Those skilled in the art can clearly understand other objects and advantages of the present invention that are not mentioned through the following description, and can further clearly understand them through the embodiments of the present invention. In addition, the objects and advantages of the present invention can be easily achieved through the methods and their combinations represented by the claims.

[0011] Means for solving the problem

[0012] The present invention provides a contact monitoring device for a vacuum circuit breaker. The vacuum circuit breaker is provided with a movable electrode coupled to a vacuum interrupter and a push rod assembly for raising and lowering the movable electrode. The contact monitoring device includes: an identification sticker attached to the outer peripheral surface of the push rod assembly, composed of a plurality of regions arranged along the moving direction of the push rod assembly and having a gradually changing reflectivity; a light sensor module provided with a light emitting unit, a light receiving unit, and a circuit unit. The light emitting unit is arranged in the direction facing the identification sticker and emits light toward the identification sticker. The light receiving unit is arranged in the direction facing the identification sticker and receives the light reflected from the identification sticker. The circuit unit is coupled to the light emitting unit and the light receiving unit, and measures and processes the current amount corresponding to the intensity of the reflected light by processing the signal of the light receiving unit; and a data processing device communicating with the light sensor module, judging the moving amount of the push rod assembly according to the current amount sensed by the light sensor module, thereby calculating the amount of contact wear.

[0013] The identification sticker is characterized in that the boundary region where the reflectivity changes has a gradual change form.

[0014] At this time, the contact monitoring device for a vacuum circuit breaker of the present invention further includes a temperature sensor disposed adjacent to the light sensor module and measuring temperature. The data processing device communicates with the temperature sensor, judges the moving amount of the push rod assembly according to the output signal output from the light sensor module, thereby calculating the amount of contact wear, and corrects the contact wear amount judgment reference according to the measurement result of the temperature sensor.

[0015] In addition, the present invention provides a correction method for a contact monitoring device for a vacuum circuit breaker. The contact monitoring device for the vacuum circuit breaker monitors the contact state by using the voltage output value output from the optical sensor module. Wherein, the correction method includes: Step S200, determining whether the contact state of the vacuum circuit breaker has changed; Step S300, if it is determined in Step S200 that the contact state of the vacuum circuit breaker has changed, then determining whether the vacuum circuit breaker has changed to a contact closed state; Step S400, if it is determined in Step S300 that it is in the contact closed state, then determining the position of the push rod assembly of the vacuum circuit breaker through the voltage output value output from the optical sensor module; Step S500, if the position of the push rod assembly is determined in Step S400, then determining whether the contact state is normal and whether the contact wear amount is below the set value according to the contact wear amount judgment criterion in the contact closed state; and Step S600, storing the processing result of Step S500.

[0016] At this time, in one embodiment, it further includes: Step S210, if it is determined in Step S200 that the contact state of the vacuum circuit breaker has not changed, then determining whether the preset period has been reached; Step S310, if it is determined in Step S210 that the preset period has been reached, then determining whether the vacuum circuit breaker is in the open state; Step S330 and Step S350, if it is determined in Step S310 that the vacuum circuit breaker is in the open state, then in Step S330, measuring the off position of the push rod assembly of the vacuum circuit breaker through the voltage output value output from the optical sensor module, and if it is determined in Step S310 that the vacuum circuit breaker is not in the open state, then in Step S350, measuring the on position of the push rod assembly of the vacuum circuit breaker through the voltage output value output from the optical sensor module; Step S370, determining whether it is necessary to correct the contact wear amount judgment criterion of the optical sensor module according to the off position or on position of the push rod assembly measured in Step S330 or Step S350, and correcting the contact wear amount judgment criterion.

[0017] In Step S330, Step S350, and Step S400, the position of the push rod assembly, the off position of the push rod assembly, and the on position are measured according to the current value of the photocurrent generated by the optical sensor module receiving the light reflected from the identification sticker after the optical sensor module emits light to the outer peripheral surface of the rod housing of the push rod assembly or the voltage output value obtained by converting the current value.

[0018] The identification sticker is characterized by being composed of a plurality of regions arranged along the moving direction of the push rod assembly and having a periodically changing reflectivity.

[0019] The identification sticker is characterized in that the boundary region where the reflectivity changes has a gradual change form.

[0020] The optical sensor module includes: a light emitting part arranged in the direction facing the identification sticker to emit light to the identification sticker; a light receiving part arranged in the direction facing the identification sticker to receive the light reflected from the identification sticker; and a circuit part combined with the light emitting part and the light receiving part to measure and process the current value according to the intensity of the reflected light by processing the signal of the light receiving part.

[0021] The step S600 is executed after the step S370.

[0022] If, in the step S370, the voltage output value output from the optical sensor module changes while the contact state of the vacuum circuit breaker remains unchanged, it is determined that the external temperature has changed, and the contact wear amount judgment criterion is changed.

[0023] In the S370, the change in the voltage output value output from the optical sensor module is judged by comparing the voltage output value output from the optical sensor module measured in the preset period and the voltage output value output from the optical sensor module measured before the preset period.

[0024] In addition, in another embodiment, it further includes: step S210 of judging whether the preset period is reached if the contact state of the vacuum circuit breaker does not change in the step S200; step S230 of judging whether the temperature has changed based on the measured value of the temperature sensor if the preset period is reached in the step S210; and step S250 of changing the contact wear amount judgment criterion if it is judged in the step S230 that the temperature has changed.

[0025] The step S600 is executed after the step S250.

[0026] If it is judged in the step S250 that the temperature rises or falls, the contact wear amount judgment criterion is changed to a contact wear amount judgment criterion corrected corresponding to the rising or falling temperature.

[0027] The step S230 is characterized by monitoring the measured value of the temperature sensor in real time or periodically.

[0028] Effects of the invention

[0029] The contact monitoring device for a vacuum circuit breaker of the present invention and the correction method based on the same correct the characteristic value of the optical sensor according to the operating temperature in consideration of the temperature characteristics of the optical sensor, thereby enabling accurate sensing of the contact wear amount.

[0030] In addition, the contact monitoring device for a vacuum circuit breaker of the present invention and the correction method based on the same correct the characteristic value of the optical sensor by using a temperature sensor, thereby enabling accurate sensing of the contact wear amount even when the sensing result of the optical sensor changes according to the operating temperature.

[0031] When specifically describing the embodiments below, the specific effects of the present invention will be described together with the above effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. is a partial cross-sectional view of a vacuum circuit breaker using the contact monitoring device according to the first or second embodiment of the present invention.

[0033] Figure 2 FIG. is a perspective view showing the installation state of the contact monitoring device according to the first embodiment of the present invention.

[0034] Figure 3 FIG. is an exploded perspective view of the optical sensor of the contact monitoring device according to the first embodiment of the present invention.

[0035] Figure 4 FIG. is a schematic view of the identification sticker of the contact monitoring device according to the first embodiment of the present invention.

[0036] Figure 5 FIG. is a perspective view showing the operating state of the contact monitoring device according to the first embodiment of the present invention.

[0037] Figure 6 FIG. is a curve showing an example of the output characteristics that change according to the distance of the contact monitoring device according to the first or second embodiment of the present invention.

[0038] Figure 7 FIG. is a curve showing an example of the temperature characteristics of the contact monitoring device according to the first or second embodiment of the present invention.

[0039] Figure 8 FIG. is a flowchart showing the correction method of the contact monitoring device according to the first embodiment of the present invention.

[0040] Figure 9 FIG. is a curve showing the voltage output according to the distance of the contact monitoring device according to the first or second embodiment of the present invention due to temperature.

[0041] Figure 10It is a perspective view showing the setting state of the contact monitoring device according to the second embodiment of the present invention.

[0042] Figure 11 It is an exploded perspective view showing the optical sensor of the contact monitoring device according to the second embodiment of the present invention.

[0043] Figure 12 It is a schematic view showing the identification sticker of the contact monitoring device according to the second embodiment of the present invention.

[0044] Figure 13 It is a perspective view showing the operation state of the contact monitoring device according to the second embodiment of the present invention.

[0045] Figure 14 It is a flowchart showing the correction method of the contact monitoring device according to the second embodiment of the present invention. Detailed Description of the Invention

[0046] Hereinafter, the foregoing objects, features, and advantages will be described in detail with reference to the accompanying drawings, so that those of ordinary skill in the art can easily implement the technical idea of the present invention. In the process of describing the present invention, when it is determined that the specific description of related well-known technologies may make the gist of the present invention unclear, the detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar components.

[0047] Hereinafter, the configuration of any component "above (or below)" or "on (or under)" a component not only means that the any component is disposed in contact with the top surface (or bottom surface) of the component, but also means that other components may be interposed between the component and the any component disposed above (or below) the component.

[0048] In addition, when it is described that a certain component is "connected", "coupled", or "joined" to another component, it should be understood that the above components can be directly connected or joined, but other components may also be interposed between the components, and each component can also be "connected", "coupled", or "joined" through other components.

[0049] Figure 1 It is a partial cross-sectional view showing a vacuum circuit breaker using the contact monitoring device according to the first or second embodiment of the present invention.

[0050] As Figure 1As shown in the figure, the contact monitoring device B for the vacuum circuit breaker according to the first or second embodiment of the present invention is disposed below the main circuit portion 100 of the vacuum circuit breaker A and monitors the contact wear of the vacuum interrupter 130. The contact monitoring device B is connected and communicates with a data processing device 800 disposed outside the vacuum circuit breaker A in a wired or wireless manner.

[0051] Next, a brief description of the main components of the vacuum circuit breaker A is given as follows (only the components required for the present invention in the configuration of the vacuum circuit breaker are briefly described).

[0052] The vacuum circuit breaker A includes: a main circuit portion 100 including a vacuum interrupter 130; a push rod assembly 200 and a main shaft 300 for transmitting power to the contacts of the vacuum interrupter 130; and a mechanism assembly 400 that generates a driving force and transmits the driving force by connecting to the main shaft 300.

[0053] Inside the housing 110 of the main circuit portion 100, a vacuum interrupter 130 is provided. The vacuum interrupter 130 is provided with: an insulating container 132 forming an accommodation space; a fixed electrode 134 fixed to the upper inner side of the insulating container 132; a fixed contact 134a provided at the end of the fixed electrode 134; a movable electrode 136 movably provided at the lower inner side of the insulating container 132; and a movable contact 136a provided at the end of the movable electrode 136. Inside the insulating container 132, an arc shield 132a forming a vacuum is accommodated, and the arc shield 132a surrounds the peripheries of the fixed electrode 134, the fixed contact 134a, the movable electrode 136, and the movable contact 136a. The movable contact 136a contacts (pushed-in state) or separates from (open state) the fixed contact 134a through the movable electrode 136. The movable electrode 136 is lifted and lowered by the push rod 230 of the push rod assembly 200.

[0054] The push rod assembly 200 pushes the movable electrode 136 in or separates it. The push rod assembly 200 is composed of a plurality of shafts and springs that transmit the power of the main shaft 300 to the movable electrode 136. A part of the configuration of the contact monitoring device B described later is provided on the rod housing 210 of the push rod assembly 200. The main shaft 300 is connected to the lower end of the push rod assembly 200.

[0055] The main shaft 300 is connected to the mechanism assembly 400 and transmits the power generated by the mechanism assembly 400 to the push rod assembly 200.

[0056] Figure 2 It is a perspective view showing the installation state of the contact monitoring device according to the first embodiment of the present invention. Figure 3 It is an exploded perspective view showing the optical sensor of the contact monitoring device according to the first embodiment of the present invention. Figure 4It is a schematic diagram of the identification sticker of the contact monitoring device according to the first embodiment of the present invention. Figure 5 It is a perspective view showing the operation state of the contact monitoring device according to the first embodiment of the present invention.

[0057] As Figure 2 and Figure 3 shown, the contact monitoring device B according to the first embodiment of the present invention includes: a sensor assembly 500 disposed on the lower side of the main circuit portion 100; an identification sticker 700 attached to the outer peripheral surface of the rod housing 210; and a data processing device 800 for overall control and judgment.

[0058] The sensor assembly 500 includes: a light sensor module 510 for sensing the position of the identification sticker 700; a sensor holder 530 for accommodating the light sensor module 510; and a sensor bracket 550 for coupling the sensor holder 530 to the lower side of the main circuit portion 100.

[0059] The light sensor module 510 includes a light emitting portion 512, a light receiving portion 514, and a circuit portion 516 for processing signals of the light emitting portion 512 and the light receiving portion 514. The light emitting portion 512 and the light receiving portion 514 are arranged side by side on one side of the circuit portion 516. The light sensor module 510 is arranged such that the light emitting portion 512 and the light receiving portion 514 face the rod housing 210 of the push rod assembly 200. The setting direction of the light sensor module 510 will be described later.

[0060] The light sensor module 510 is a kind of light sensor that emits light from the light emitting portion 512, and the emitted light is reflected on the surface of the identification sticker 700, and the amount of light reflected and returned is sensed by the light receiving portion 514.

[0061] Therefore, a photocurrent proportional to the intensity of the light sensed by the light receiving portion 514 flows in the circuit portion 516, and the greater the amount of light reflected and returned, the greater the amount of current generated. The circuit portion 516 converts the photocurrent value into a voltage value and transmits the converted voltage value to the data processing device 800. However, according to the setting or need, the current value can also be directly transmitted to the data processing device 800 and used as a judgment reference. Since the light sensor module 510 senses the amount of light that is emitted from the light emitting portion 512 and then enters after reflection, the farther away from the light sensor module 510, the less the amount of light that enters the light receiving portion 514 after reflection. If the amount of light entering decreases, the photocurrent weakens, resulting in a smaller voltage value. Therefore, based on this, the distance from the light sensor module 510 to the sensing object can be known.

[0062] Therefore, in the light sensor module 510, the direction of the reflected light after emitting light becomes the sensing direction. The light sensor module 510 can sense displacement in the same direction as the sensing direction.

[0063] The circuit unit 516 can process the photocurrent and output a signal to the outside. The output signal becomes smaller or larger according to the detected light amount, and the light amount changes according to the displacement. Therefore, if the signal output from the circuit unit 516 is processed, the displacement can be finally calculated. The signal output from the circuit unit 516 can be transmitted to a mobile terminal of a manager (not shown) or a data processing device 800 described later.

[0064] The sensor holder 530 houses the optical sensor module 510. The sensor holder 530 can be in the shape of a box open on one side. The light emitting part 512 and the light receiving part 514 of the optical sensor module 510 are exposed to the open side of the sensor holder 530. A coupling part 532 for coupling with the sensor bracket 550 can be provided on the sensor holder 530, and the coupling part 532 can be provided on the other side or the side surface of the sensor holder 530 opposite to the open side. The coupling part 532 can be provided in the shape of a hole for inserting a bolt.

[0065] The sensor holder 530 can also be or a frame shape such as, as long as the optical sensor module 510 can be inserted and prevented from coming off.

[0066] The sensor bracket 550 is installed on the lower side of the outer shell 110 forming the appearance of the main circuit unit 100. The shape of the sensor bracket 550 is not limited as long as it can support the sensor holder 530. However, in the present invention, the installation position of the optical sensor module 510 needs to face the rod outer shell 210. Therefore, the sensor bracket 550 has a shape that is mirrored, and the sensor holder 530 is coupled to the surface of the sensor bracket 550 that extends downward to the lower side of the outer shell 110 of the main circuit unit 100. A plurality of fastening holes for fastening the sensor holder 530 and a plurality of fastening holes for fastening to the outer shell 110 can be formed on the plate surface of the sensor bracket 550. The sensor bracket 550 can be coupled to the sensor holder 530 and the outer shell 110 by means of bolting or the like.

[0067] In the foregoing embodiment, the case where the sensor holder 530 and the sensor bracket 550 are provided separately has been described as an example. However, a single fixing unit can also be used as long as it can house the optical sensor module 510 and be coupled to the outer shell 110 of the main circuit unit 100. The optical sensor module 510 thus provided is used to measure the displacement in a direction different from the sensing direction by recognizing the sticker 700.

[0068] As Figure 4As shown, the identification sticker 700 is a sticker attached to the outer peripheral surface of the rod housing 210. The identification sticker 700 is in a quadrilateral shape with a prescribed size. The identification sticker 700 is attached in the direction facing the light sensor module 510. Taking Figure 4 as a reference, the identification sticker 700 can be formed in a shape that gradually changes from black to white as it approaches the lower end from the upper end along the vertical direction. Conversely, the identification sticker 700 can also be formed in a shape that gradually changes from black to white as it approaches the upper end from the lower end. That is, the identification sticker 700 is formed such that the reflectance of a prescribed area differs from that of another area, enabling the light sensor module 510 to distinguish and sense it.

[0069] The identification sticker 700 has a plurality of regions where the color (or light and shade) changes gradually from white via gray to black, or from black via gray to white. In this way, the regions with different colors or light and shade in the identification sticker 700 exhibit different reflectances respectively.

[0070] The white and black regions of the identification sticker 700 can be arranged along the vertical direction. The uppermost end of the identification sticker 700 is black and the lowermost end is white in order to clearly define the boundary with the peripheral part where the identification sticker 700 is attached and avoid being affected by the surrounding colors. Black and white regions can be formed at approximately 10% of the uppermost end and the lowermost end of the identification sticker 700, and the remaining regions can be formed in a gradient shape. However, the identification sticker 700 can also be formed in a gradient shape for the entire region including the uppermost end and the lowermost end (in this case, sensing can be performed without being affected by the surrounding colors by adjusting the initial sensing position or the attachment position). The attachment position of the identification sticker 700 is adjusted such that the sensing region of the light sensor module 510 exists within the gradient region of the identification sticker 700 other than black and white.

[0071] As described above, in the case where the identification sticker 700 is formed in a gradient shape, the current value of the reflected light gradually changes as it passes through the boundary of each region.

[0072] The identification sticker 700 is used to identify the amount of contact wear, which is the displacement perpendicular to the sensing direction of the light sensor module 510.

[0073] In the present invention, the identification sticker 700 is used to identify whether the rising height of the push rod 230 changes when the fixed contact 134a and the movable contact 136a are worn to more than a prescribed amount (in the present invention, the term "amount of contact wear" is defined as the displacement of the push rod rising due to the wear of the fixed contact and the movable contact caused by contact. Since it is difficult to measure the rising displacement of the push rod, the displacement of the push rod is indirectly measured by attaching the identification paper to the rod housing).

[0074] In a state where the contacts are separated, the open position in the sticker 700 is set as the area that reflects the light emitted from the optical sensor module 510. Additionally, in a state where the contacts are in contact, the light emitted from the optical sensor module 510 can be reflected at the close position (refer to Figure 2 ) of the sticker 700. The area in the sticker 700 that reflects the light emitted from the optical sensor module 510 is set at the Figure 5 open position, the contact position, and in an area adjacent to the contact position. Figure 4

[0075] On the other hand, the current values corresponding to the open position and the close position of the sticker 700 measured by the optical sensor module 510 are transmitted to the data processing device 800. As shown in Figure 2 and Figure 5 , the data processing device 800 is provided outside the vacuum circuit breaker A and communicates with the optical sensor module 510. The data processing device 800 grasps the position of the push rod assembly 200 based on the data measured by the optical sensor module 510. Additionally, the data processing device 800 determines the contact wear amount based on the position of the push rod assembly 200 and decides whether to warn the user. The data processing device 800 sets a contact wear amount judgment criterion required for judging the contact wear amount and also functions to correct this judgment criterion due to temperature. The detailed functions of the data processing device 800 will be described later.

[0076] Next, a method for the contact monitoring device according to the first embodiment of the present invention having the aforementioned configuration to sense the contact wear amount using the optical sensor module will be described in detail.

[0077] The push rod assembly 200 moves in the vertical direction, which is the Figure 2 up-and-down direction, and thus always maintains the same position (open position) in the contact separation state. In the first contact state, the push rod assembly 200 exhibits a specified amount of vertical displacement (close position). After the first contact, the contact state is maintained until the contacts are disconnected due to a fault current or for maintenance, etc. Therefore, no contact wear occurs.

[0078] However, if contact wear occurs due to repeated contact after multiple contact separations, the push rod assembly 200 rises in the vertical direction corresponding to the wear amount. That is, the vertical displacement of the push rod assembly 200 becomes the contact wear amount.

[0079] ​In order to measure the movement amount of the push rod assembly 200, it is necessary to sense the vertical displacement of the push rod assembly 200. For this purpose, it is preferable to provide a sensor capable of sensing the vertical displacement on the lower side of the push rod assembly 200. However, since the main shaft 300 is coupled to the lower side of the push rod assembly 200 and there is a lower member of the vacuum circuit breaker A, it is difficult to ensure sufficient space for setting the sensor.

[0080] Therefore, the optical sensor module 510 of the present invention is disposed adjacent to the outer peripheral surface of the rod housing 210 and is disposed on one side parallel to the vertical movement direction of the push rod assembly 200. At this time, the sensing direction of the optical sensor module 510 is a direction perpendicular to the vertical movement direction of the push rod assembly 200. In addition, in order to minimize interference with the peripheral portion, the optical sensor module 510 is disposed at a portion closer to the outside at the lower end of the housing 110 of the main circuit unit 100.

[0081] The push rod assembly 200 has only a vertical displacement and does not move in the horizontal direction. Therefore, even if the optical sensor module 510 is provided on one side, the vertical displacement of the push rod assembly 200 cannot be sensed. To solve this problem, in this embodiment, an identification sticker 700 is used to produce the same effect as converting the vertical displacement of the push rod assembly 200 into a horizontal displacement, so that the optical sensor module 510 can be used.

[0082] As Figure 2 shown, the identification sticker 700 is attached to the outer peripheral surface of the rod housing 210 on the side facing the optical sensor module 510. At this time, in the contact separation state, the position where the light emission and light reception of the optical sensor module 510 are formed (hereinafter referred to as the sensing position) corresponds to the off position (open position) of the identification sticker 700. In the contact separation state, the positions where the light emission and light reception are formed are always the same. In addition, in the contact state, the initial positions where the light emission and light reception of the optical sensor module 510 are formed correspond to the on position (close position) of the identification sticker 700. The sensing position of the optical sensor module 510 is the same until the contact wear amount appears.

[0083] If the rod housing 210 rises as the contact wear amount increases, the sensing position of the optical sensor module 510 gradually changes. Since the identification sticker 700 has a gradient form, if the light emission and light reception positions change, the current value of the reflected light based thereon also changes.

[0084] If the contact wear amount increases with repeated contact, then as Figure 5As shown, the rod housing 210 gradually rises. The identification sticker 700 rises together with the rise of the rod housing 210. Since the positions of the light emitting part 512 and the light receiving part 514 of the light sensor module 510 are fixed, the sensing position gradually descends as the identification sticker 700 rises (descends compared with the Figure 5 close position).

[0085] If viewed with reference to the identification sticker 700 of Figure 4 , since the sensing position faces the white area of the identification sticker 700, the current value of the reflected light gradually increases as the contact wear amount increases. Since black is a light-absorbing color, the amount of reflected light increases as it gets closer to the white side, resulting in an increase in the current amount. Therefore, the voltage value converted from the current value also gradually increases, so that the data processing device 800 can grasp the vertical displacement of the rod housing 210 based on this.

[0086] If the voltage value or current value measured by the light sensor module 510 reaches the threshold value, the data processing device 800 can determine that the contact wear amount has reached the threshold value and inform the user. In addition, the data processing device 800 can correct the contact wear amount due to temperature changes (which will be described later).

[0087] The light sensor module 510 cannot directly sense the vertical displacement, but the reflectance that changes based on the light and dark changes of the identification sticker 700 has the effect of converting the vertical displacement into a horizontal displacement. Therefore, the light sensor module 510 can be used to indirectly monitor and sense the contact wear amount.

[0088] The contact wear amount monitored based on the light sensor module 510 can be monitored in real time or at a preset time period. The output value of the light sensor module 510 is transmitted to the data processing device 800 and processed and analyzed. Therefore, the contact wear amount can be judged before it reaches the threshold value, so that the appropriate maintenance time point can be known. In addition, the reliability and performance of the vacuum circuit breaker can be improved.

[0089] Figure 6 is a curve showing an example of the output characteristics that change according to the distance of the contact monitoring device according to the first embodiment or the second embodiment of the present invention.

[0090] As Figure 6 shown, there is an interval where the output value (relative collector current) that changes according to the distance between the light sensor module 510 and the reflecting surface that reflects the light emitted by it is linear. For example, the output value of the light sensor module 510 can be linear when the reflecting surface is at a distance of 1.0 to 2.0 (PU).

[0091] However, as described above, the present invention uses the optical sensor module 510 to measure the displacement in the vertical direction, rather than the horizontal direction. Therefore, the linear range of the output value of the optical sensor module 510 can be applied to identify the sticker 700, and the light-emitting position, light-receiving position, and on-position of the optical sensor module 510 can be set. That is, the position of the identification sticker 700 can be set so that the sensing position and on-position of the optical sensor module 510 do not deviate from the linear range of the output value of the optical sensor module 510.

[0092] In the contact monitoring device of the present invention having the foregoing configuration, the operating characteristics of the optical sensor module used to sense the contact wear amount may change according to the ambient temperature.

[0093] Figure 7 It is a curve showing an example of the temperature characteristics of the contact monitoring device according to the first or second embodiment of the present invention.

[0094] Although the optical sensor module 510 varies depending on the type, it generally has Figure 7 such temperature characteristics. Since the optical sensor module 510 is a sensor that measures displacement by emitting and receiving light, the magnitude of the photocurrent changes according to the amount of received light. The relative current conversion rate of such an optical sensor module 510 due to temperature gradually increases from minus 20 degrees Celsius to plus 40 degrees Celsius but decreases again above plus 40 degrees.

[0095] In the actual field, the temperature conditions of the working environment of the vacuum circuit breaker A are in a wider range than the range from minus 5 degrees Celsius to plus 40 degrees Celsius. However, as Figure 7 shown, at temperature conditions of minus 20 degrees Celsius and plus 40 degrees Celsius, the output of the optical sensor module 510 may deviate by more than 10%. Since the optical sensor module 510 also operates within the working environment temperature range of the field, an error of up to more than 10% may occur due to temperature changes.

[0096] Therefore, if the output characteristics of the optical sensor module 510 due to temperature characteristics are not considered, even if the monitoring position is the same, the output value of the optical sensor module 510 will vary due to the ambient temperature. If there is no appropriate correction for temperature and the output value of the optical sensor module 510 is used to monitor the contact wear amount, inaccurate results will be obtained.

[0097] To solve this problem, the output value can be corrected by periodically measuring the output value of the optical sensor module 510 and reflecting the characteristics due to temperature, thereby obtaining an accurate contact wear amount.

[0098] Next, a correction method for a contact monitoring device for a vacuum circuit breaker that can compensate for output value deviations of an optical sensor module due to operating temperature will be described in detail (hereinafter, unless otherwise specified, the control subject of each step is a data processing device. In addition, although a case where the data processing device controls based on a signal obtained by converting the current value of the reflected light sensed by the optical sensor module into a voltage value is described, this is only an example, and the current value may also be used as a control reference).

[0099] Figure 8 It is a flowchart showing the correction method of the contact monitoring device according to the first embodiment of the present invention. Figure 9 It is a curve showing the voltage output by the contact monitoring device according to the temperature and distance in the first or second embodiment of the present invention.

[0100] As Figure 8 shown, the data processing device 800 determines whether the contact state of the vacuum circuit breaker A has changed (S200) in the measurement standby state (S100) of the optical sensor module 510. A change in the contact state of the vacuum circuit breaker A means a change from the open state, which is the contact separation state, to the contact state or from the contact state to the open state. If the contact state changes, the voltage value output from the optical sensor module 510 changes. However, when the contact does not change, since the sensing position of the optical sensor module 510 is the same, there should be no change in the voltage value even if measurements are periodically performed. Therefore, the data processing device 800 first determines whether the contact state of the vacuum circuit breaker A has changed.

[0101] If it is determined in step S200 that the contact state of the vacuum circuit breaker A has changed, the data processing device 800 determines whether it has changed to the contact state in which the movable contact 136a of the vacuum circuit breaker A is in contact with the fixed contact 134a (S300). Since contact wear does not occur in the contact separation state and only occurs in the contact state, it is determined in step S300 whether it has changed to the contact state.

[0102] If it is determined in step S300 that it is in the contact state, the position of the push rod assembly 200 is determined by the voltage output value output from the optical sensor module 510 (S400). That is, as described above, the circuit unit 516 of the optical sensor module 510 converts the current amount that changes according to the amount of light reflected from the identification sticker 700 attached to the rod housing 210 into a voltage value, and the data processing device 800 analyzes this voltage value and grasps the position of the push rod 230 through position measurement (grasps the position of the push rod by grasping the position of the rod housing 210 of the push rod assembly).

[0103] If the rod housing 210 moves from the disconnected position to the initial contact position, the light emitted from the light emitting unit 512 moves from the open position to the close position of the identification sticker 700 at the position where the light is reflected by the identification paper sticker. Since the identification sticker 700 has a gradient form, the light amounts at the open position and the close position are different, and the voltage value changes according to the photocurrent value. Thus, the displacement of the rod housing 210 can be understood through the output voltage value output from the light sensor module 510, and the displacement of the push rod 230 that actually drives the movable contact 136a can be calculated through the displacement of the rod housing 210.

[0104] If the position of the push rod 230 is determined in step S400, the data processing device 800 determines whether the contact state is normal and whether the contact wear amount is below the set value during contact (S500). The data processing device 800 determines the contact state and determines whether the contact wear amount is below the set value based on the pre-stored contact wear amount determination reference. The contact wear amount determination reference can be in Figure 9 the form of a curve or data in a form that can derive Figure 9 the curve and is stored in the data processing device 800.

[0105] After that, the foregoing signal processing results and calculation results are stored (S600), and then the same process is repeated.

[0106] If the contact state of the vacuum circuit breaker A does not change in the foregoing step S200, it is determined whether the preset period has been reached (S210). If the preset period has been reached, the data processing device 800 determines whether the vacuum circuit breaker A is in the disconnected state (S310).

[0107] If the vacuum circuit breaker A is in the disconnected state in step S310, the off position of the push rod 230 is measured through the voltage output value output from the light sensor module 510 (S330). If it is determined in step S310 that the vacuum circuit breaker A is not in the disconnected state, the on position of the push rod 230 is measured through the voltage output value output from the light sensor module 510 (S350).

[0108] When measuring the off position and the on position at the first contact, a voltage output value curve with a specified inclination A as shown in Figure 9 can be derived. The voltage output value of the light sensor module 510 that changes according to the moving distance of the rod housing 210 is in the form of a straight line curve. The x-axis of the curve is the moving distance of the identification sticker 700 when moving from the disconnected state to the contact state. The y-axis is the voltage output value output from the light sensor module 510 at the measurement time point.

[0109] Based on the off position and on position of the push rod 230 measured in step S330 or step S350, it is determined whether it is necessary to correct the contact wear amount judgment reference based on temperature. If a temperature change has occurred, the contact wear amount judgment reference is corrected (S370). If the contact wear amount judgment reference is corrected, step S600 is executed.

[0110] It is possible to determine whether it is necessary to correct the contact wear amount judgment reference in the following manner.

[0111] If after manufacturing the vacuum circuit breaker A, under test conditions, the voltage output value of the optical sensor module 510 is measured at the open position which is the initial off state, and the voltage output value of the optical sensor module 510 is measured at the close position which is the initial contact state, then the voltage output value curve of the optical sensor module 510 at the test temperature can be obtained. For example, if the test condition is 20 degrees Celsius, since the x-axis value and y-axis value are known, the curve of b1 can be derived by the linear equation ax + b = y. Figure 9 Similarly, if the test condition is 15 degrees Celsius, the b2 curve can be derived, and if the test condition is 30 degrees Celsius, the b3 curve can be derived.

[0112] In this way, pre-tests can be carried out under various temperature conditions in advance, and the voltage output value data of the optical sensor module 510 can be pre-stored in the data processing device 800 according to the operating temperature of the vacuum circuit breaker A. Alternatively, the voltage output value data of the optical sensor module 510 derived under one temperature condition can be stored in the data processing device 800, and then new curves can be derived by the data processing device 800 as needed to be used as the reference for judging the contact wear amount.

[0113] More specifically, since the voltage output value curve represents the contact state, if the state of the contact does not change, the voltage output value will not change. Therefore, due to the change in temperature conditions, a curve with the same slope as b1 or b2 can be used as the reference for judging the state of the optical sensor module 510.

[0114] That is, if the voltage output value output from the optical sensor module 510 still changes although the state of the contact does not change, it is determined that the external temperature has changed, and thus the voltage output value curve used as the reference is changed.

[0115] After the vacuum circuit breaker A is set on-site, the voltage output value of the optical sensor module 510 is measured at the open position which is in the off state. Since the push rod 230 does not move in the off state, the rod housing 210 and the identification sticker 700 also do not move. After that, if contact occurs while the temperature on-site remains unchanged, the voltage output value of the optical sensor module 510 is measured at the close position which is in the contact state. Based on the sensed values measured in this way, a curve corresponding to the temperature on-site can be derived.

[0116] For example, it can be assumed that the reference curve derived based on the voltage output value of the optical sensor module 510 on-site is b1. If, according to the aforementioned steps S210, S310, and S350, the result of measuring the voltage output value of the optical sensor module 510 when the contacts of the vacuum circuit breaker A do not change to the close state is C1, then the contact wear amount x1 corresponding to the voltage output value C1 is the same as the contact wear amount at the close position. Therefore, the data processing device 800 can determine that the temperature on-site has not changed. In this case, the b1 curve is continuously used as the judgment reference for the contact wear amount.

[0117] If the voltage output value of the optical sensor module 510 is measured at a preset period but the contact state has not changed and the measured voltage output value is C2, the data processing device 800 can determine that the temperature on-site has risen. In this case, if the temperature has not changed, C2 should be in the same position as C1. Thus, it is the temperature rise that causes the voltage output value to be C2. At this time, if the voltage output value measured as C2 is used as the reference of the b1 curve to judge the contact wear amount, the contact wear amount is shown as x2. Therefore, even when the contact wear amount does not exceed the threshold value (Max), it will be judged as exceeding the threshold value. Thus, the data processing device 800 cannot use the b1 curve as the judgment reference for the contact wear amount, but instead moves the curve by the y-intercept value corresponding to the change from C1 to C2, and uses the curve b3 as the judgment reference for the contact wear amount.

[0118] On the contrary, if the voltage output value of the optical sensor module 510 is measured while the contact state has not changed and the measured value is C3, the data processing device 800 can determine that the temperature on-site has dropped. In this case, if the temperature has not changed, C3 should be in the same position as C1. Thus, it is the temperature drop that causes the voltage output value to be C3. At this time, if the voltage output value measured as C3 is used as the reference of the b1 curve to judge the contact wear amount, the contact wear amount is shown as x3. Therefore, the contact wear amount is misjudged. Thus, the data processing device 800 cannot use the b1 curve as the judgment reference for the contact wear amount, but instead moves the curve by the y-intercept value corresponding to the change from C1 to C3, and uses the curve b2 as the judgment reference for the contact wear amount.

[0119] However, if the amount of contact wear increases due to repeated contact of the contacts without a temperature change, the voltage output value will change. In this case, since the temperature has not changed, the contact wear amount judgment criterion is not corrected.

[0120] Contact wear occurs only when the contacts are in contact, and the contacts are always in a separated state before contact. Since the position of the push rod 230 is always the same in the contact separated state, the voltage value does not change and remains the same. Therefore, in the contact separated state, the reference curve is set by measuring the voltage value of the optical sensor assembly 510. If contact occurs and contact wear occurs, the amount of contact wear based on the voltage output value can be directly judged by comparing with the reference curve in the previous contact separated state.

[0121] As described above, if the contact wear amount judgment criterion due to temperature is not corrected, even if the amount of contact wear reaches above the preset maximum value, it cannot be accurately judged. On the contrary, it may also occur that when the amount of contact wear does not reach the preset maximum value, it is judged to have reached the maximum value.

[0122] Therefore, to prevent this problem, the voltage output value of the optical sensor module 510 can be periodically confirmed. When it is judged that a temperature change has occurred, the judgment criterion for the amount of contact wear is determined by correcting the reference curve.

[0123] The difference between the distance value corresponding to the voltage output value of the optical sensor module 510 measured when contacting once and the distance value corresponding to the voltage output value of the optical sensor module 510 measured when contacting twice becomes the amount of contact wear. The data processing device 800 can be set to output a warning message to the user if the amount of contact wear reaches the maximum value. Alternatively, the data processing device 800 can also be set to output a warning message to the user before the amount of contact wear reaches the maximum value.

[0124] For example, it can be set that when the maximum value of the amount of contact wear is set to 5 mm, a warning message is output to the user when the amount of contact wear reaches 5 mm or 4.8 mm.

[0125] Figure 10 It is a perspective view showing the installation state of the contact monitoring device according to the second embodiment of the present invention. Figure 11 It is an exploded perspective view showing the optical sensor of the contact monitoring device according to the second embodiment of the present invention. Figure 12 It is a schematic view showing the identification sticker of the contact monitoring device according to the second embodiment of the present invention. Figure 13 It is a perspective view showing the operation state of the contact monitoring device according to the second embodiment of the present invention.

[0126] As Figure 10 and Figure 11 shown, the contact monitoring device B of the second embodiment of the present invention includes: a sensor assembly 500 disposed on the lower side of the main circuit portion 100; an identification sticker 700 attached to the outer peripheral surface of the rod housing 210; and a data processing device 800 for overall control and judgment. Hereinafter, the contact monitoring device of the second embodiment of the present invention will be described centering on the differences from the contact monitoring device of the first embodiment of the present invention.

[0127] In the contact monitoring device B of the second embodiment of the present invention, the sensor assembly 500 further includes a temperature sensor 520 for measuring the temperature around the optical sensor module 510.

[0128] The temperature sensor 520 is disposed adjacent to the optical sensor module 510. The temperature sensor 520 is used to correct the characteristics of the optical sensor module 510 due to temperature. Therefore, it is preferable to dispose the temperature sensor 520 as adjacent to the optical sensor module 510 as possible. The temperature sensor 520 can be disposed in a state of being mounted on an additional holder (not shown) for coupling with a sensor bracket 550 described later.

[0129] The temperature sensor 520 is supported by the sensor bracket 550. The temperature sensor 520 can be coupled to the back surface of the plate surface of the sensor bracket 550 to which the sensor holder 530 is coupled or the lower side of the surface of the sensor bracket 550 coupled to the housing 110. The temperature sensor 520 can be directly coupled to the sensor bracket 550 by fastening members such as bolts (not shown), or can be coupled to an additional holder and mounted on the sensor bracket 550.

[0130] As Figure 12 shown, in the contact separation state, the off (open) position in the identification sticker 700 Figure 10 is set as the region (sensing position) for reflecting the light emitted from the optical sensor module 510.

[0131] After that, each time the contact is formed, the contact wears, and the push rod assembly 200 gradually rises, so the identification sticker 700 also gradually rises. As a result, the sensing position of the optical sensor module 510 moves toward the lower end side of the identification sticker 700. When the displacement of the push rod assembly 200 generated due to the increase in the number of contact contacts is within the preset contact wear amount, the sensing position of the optical sensor module 510 is Figure 13 between the off position and the maximum on position (on position).

[0132] When the push rod assembly 200 rises above a preset contact wear amount, the sensing position of the optical sensor module 510 corresponding to the maximum value of the preset contact wear amount is defined as the Maxclose position (refer to Figure 10 and Figure 13 ). It can be determined in advance before the contact monitoring device is set on site which part of the identification sticker 700 is the sensing position of the optical sensor module 510 and the position with the largest contact wear amount.

[0133] On the other hand, according to the output signal of the sensing result within the range from the off position to the Maxclose position of the identification sticker 700 measured by the optical sensor module 510, and the sensing result of the temperature sensor 520 are transmitted to the data processing device 800. As Figure 10 and Figure 13 shown, the data processing device 800 is arranged outside the vacuum circuit breaker A and communicates with the optical sensor module 510 and the temperature sensor 520. The data processing device 800 grasps the position of the push rod assembly 200 by analyzing the output signal of the optical sensor module 510. In addition, the data processing device 800 determines the contact wear amount based on the position of the push rod assembly 200 and decides whether to warn the user. The data processing device 800 sets a contact wear amount judgment criterion required for judging the contact wear amount and also plays a role in correcting it due to temperature. At this time, the correction of the characteristic value of the optical sensor module 510 due to temperature performed in the data processing device 800 is based on the sensed value of the temperature sensor 520.

[0134] Figure 14 is a flowchart showing a correction method of the contact monitoring device according to the second embodiment of the present invention.

[0135] As Figure 14 shown, in the measurement standby state (S100) of the optical sensor module 510, the data processing device 800 determines whether the contact state of the vacuum circuit breaker A has changed (S200).

[0136] If the contact state of the vacuum circuit breaker A has changed in step S200, the data processing device 800 determines whether the moving contact 136a of the vacuum circuit breaker A is in a contact state where it is in contact with the fixed contact 134a (S300).

[0137] If it becomes a contact state in step S300, the position of the push rod assembly 200 is determined by the voltage output value output from the optical sensor module 510 (S400).

[0138] If the position of the push rod 230 is determined in step S400, the data processing device 800 determines whether the contact state is normal at the time of contact and whether the contact wear amount is below the set value (S500).

[0139] After that, the foregoing signal processing results and calculation results are stored (S600), and then the same process is repeated.

[0140] In the foregoing step S200, if the contact state of the vacuum circuit breaker A does not change during operation, the data processing device 800 determines whether a preset cycle has been reached (S210). After determining whether a preset cycle has been reached (S210), if a preset cycle has been reached, the data processing device 800 confirms the temperature around the optical sensor module 510 by confirming the output signal of the temperature sensor 520.

[0141] The temperature is measured in real time, and the sensed value of the temperature sensor 520 is transmitted to the data processing device 800 in real time or periodically (S230). The data processing device 800 receives the sensed value of the temperature sensor 520 in real time or periodically as needed, or processes the sensed value received in real time according to the required cycle. Therefore, if there is a temperature change, the data processing device 800 corrects the contact wear amount judgment reference (S250). If the contact wear amount judgment reference is corrected, step S600 is executed.

[0142] With Figure 9 the b1 curve as the reference value, the vacuum circuit breaker A is set on site, and then the open position is measured in the open state. Since the push rod 230 does not move in the open state, the rod housing 210 and the identification sticker 700 do not move either. Therefore, it has the same open position as the position under the test conditions. After that, the voltage output value of the optical sensor module 510 is sensed at the close position as the contact state. Based on the sensed value sensed in this way, a curve corresponding to the temperature on site can be derived.

[0143] However, since the characteristics of the optical sensor module 510 change with temperature, if the temperature on site and the test temperature change, the voltage output value of the optical sensor module 510 changes. That is, the temperature around the optical sensor module 510 is sensed in real time or periodically, and if a change occurs, the data processing device 800 can determine that the temperature of the optical sensor module 510 has changed.

[0144] For example, in a state where the b1 curve is set as the reference for judging the contact wear amount, if the measured temperature of the temperature sensor 520 rises above the existing sensed value, the data processing device 800 can determine that the temperature around the vacuum circuit breaker A has risen above the test conditions. In this case, due to the temperature rise, the curve serving as the reference for judging the contact wear amount changes from b1 to b3.

[0145] Alternatively, if the measured temperature of the temperature sensor 520 drops below the existing sensed value, the data processing device 800 can determine that the temperature around the vacuum circuit breaker A has dropped below the test conditions. In this case, due to the temperature drop, the curve serving as the reference for judging the contact wear amount changes from b1 to b2.

[0146] In the case where the reference value needs to change from b1 to b2 or b3 due to temperature changes, if the contact wear amount is judged without changing the reference value, the contact wear amount cannot be accurately judged. In this case, even if the contact wear amount reaches above the pre-set maximum value, it cannot be accurately judged.

[0147] For example, the voltage output value of the optical sensor module 510 when taking the b1 curve as the reference can be C1, and the voltage output value when the temperature rises can be C2. At this time, if the reference is not changed to curve b3 according to the rising temperature, the contact wear amount corresponding to C2 with the b1 curve as the reference becomes x2, thus showing that it exceeds the threshold of the pre-set contact wear amount. Therefore, although the contact wear amount does not reach the threshold, it is erroneously judged to have exceeded the threshold.

[0148] In addition, if the voltage output value when the temperature drops is C3, the reference curve needs to be changed to b2 according to the dropping temperature. If the reference curve is not changed to b2, the contact wear amount corresponding to C3 with the b1 curve as the reference becomes x3, so the contact wear amount is erroneously judged.

[0149] Therefore, to prevent such problems, if the state of the contact does not change, the temperature in the open state or contact state is sensed in real time or periodically. If the temperature changes, the reference for judging the contact wear amount is changed to match the temperature.

[0150] If the reference for judging the contact wear amount changes, the reference for judging the contact wear amount in the contact state also follows the changed reference.

[0151] Those of ordinary skill in the art can make various substitutions, deformations, and changes without departing from the technical idea of the present invention. Therefore, the present invention is not limited to the foregoing embodiments and drawings.

Claims

1. A contact monitoring device for a vacuum circuit breaker, the vacuum circuit breaker being provided with a movable electrode combined with a vacuum interrupter chamber and a push rod assembly for lifting and lowering the movable electrode, wherein, the contact monitoring device includes: An identification sticker attached to the outer peripheral surface of the push rod assembly, composed of a plurality of regions arranged along the vertical movement direction of the push rod assembly and having a periodically changing reflectivity; A light sensor module provided with a light emitting part, a light receiving part and a circuit part. The light emitting part is arranged in the direction facing the identification sticker and emits light towards the identification sticker. The light receiving part is arranged in the direction facing the identification sticker and receives the light reflected from the identification sticker. The circuit part is combined with the light emitting part and the light receiving part, and measures and processes the current amount corresponding to the intensity of the reflected light by processing the signal of the light receiving part; and A data processing device communicating with the light sensor module, judging the movement amount of the push rod assembly according to the current amount sensed by the light sensor module, thereby calculating the contact wear amount, and judging whether the contact wear amount is below a set value according to a pre-stored contact wear amount judgment criterion, The data processing device judges whether it is necessary to correct the contact wear amount judgment criterion based on temperature according to the off position and on position of the push rod assembly, and corrects the contact wear amount judgment criterion.

2. The contact monitoring device for a vacuum circuit breaker according to claim 1, wherein, The boundary region where the reflectivity changes in the identification sticker has a gradual change form.

3. The contact monitoring device for a vacuum circuit breaker according to claim 1, wherein, It further includes a temperature sensor arranged adjacent to the light sensor module and measuring temperature, The data processing device communicates with the temperature sensor, judges the movement amount of the push rod assembly according to the output signal output from the light sensor module, thereby calculates the contact wear amount, and corrects the contact wear amount judgment criterion according to the measurement result of the temperature sensor.

4. A correction method for a contact monitoring device for a vacuum circuit breaker, the contact monitoring device for a vacuum circuit breaker monitoring the contact state by using a voltage output value output from a light sensor module, wherein, the contact monitoring device includes: An identification sticker attached to the outer peripheral surface of the push rod assembly, composed of a plurality of regions arranged along the vertical movement direction of the push rod assembly and having a periodically changing reflectivity; A light sensor module provided with a light emitting part, a light receiving part and a circuit part. The light emitting part is arranged in the direction facing the identification sticker and emits light towards the identification sticker. The light receiving part is arranged in the direction facing the identification sticker and receives the light reflected from the identification sticker. The circuit part is combined with the light emitting part and the light receiving part, and measures and processes the current amount corresponding to the intensity of the reflected light by processing the signal of the light receiving part, and converts the current amount into a voltage output value, the correction method includes: Step S200, judging whether the contact state of the vacuum circuit breaker has changed; Step S300, if it is determined in the step S200 that the contact state of the vacuum circuit breaker has changed, then determine whether the vacuum circuit breaker has changed to the contact closed state; Step S400, if it is determined in the step S300 that it is in the contact closed state, then determine the position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the optical sensor module; Step S500, if the position of the push rod assembly is determined in the step S400, then determine whether the contact state is normal and whether the contact wear amount is below the set value according to the reference for judging the contact wear amount; and Step S600, store the processing result of the step S500.

5. The correction method of the contact monitoring device for a vacuum circuit breaker according to claim 4, wherein, further comprising: Step S210, if it is determined in the step S200 that the contact state of the vacuum circuit breaker has not changed, then determine whether the preset period has been reached; Step S310, if it is determined in the step S210 that the preset period has been reached, then determine whether the vacuum circuit breaker is in the open state; Steps S330 and S350, if it is determined in the step S310 that the vacuum circuit breaker is in the open state, then in the step S330, measure the off position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the optical sensor module, if it is determined in the step S310 that the vacuum circuit breaker is not in the open state, then in the step S350, measure the on position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the optical sensor module; Step S370, determine whether it is necessary to correct the reference for judging the contact wear amount of the optical sensor module based on the off position or on position of the push rod assembly measured in the step S330 or the step S350, and correct the reference for judging the contact wear amount.

6. The correction method of the contact monitoring device for a vacuum circuit breaker according to claim 5, wherein, in the step S330, the step S350 and the step S400, the position of the push rod assembly, the off position and the on position of the push rod assembly are measured based on the current value of the photocurrent generated by the optical sensor module receiving the light reflected from the identification sticker after the optical sensor module emits light to the identification sticker attached to the outer peripheral surface of the rod housing of the push rod assembly or the voltage output value obtained by converting the current value.

7. The correction method of the contact monitoring device for a vacuum circuit breaker according to claim 6, wherein, the boundary region where the reflectivity changes in the identification sticker is in a gradient form.

8. The correction method of the contact monitoring device for a vacuum circuit breaker according to claim 5, wherein, the step S600 is executed after the step S370.

9. The correction method of the contact monitoring device for a vacuum circuit breaker according to claim 5, wherein, If, in step S370, the voltage output value output from the optical sensor module changes while the contact state of the vacuum circuit breaker remains unchanged, it is determined that the external temperature has changed, and the contact wear amount determination reference is changed.

10. The correction method for the contact monitoring device for a vacuum circuit breaker according to claim 4, wherein, further comprising: step S210, if the contact state of the vacuum circuit breaker does not change in step S200, it is determined whether a preset period has been reached; step S230, if the preset period is reached in step S210, it is determined whether the temperature has changed based on the measured value of the temperature sensor; and step S250, if it is determined in step S230 that the temperature has changed, the contact wear amount determination reference is changed.

11. The correction method for the contact monitoring device for a vacuum circuit breaker according to claim 10, wherein, step S600 is executed after step S250.

12. The correction method for the contact monitoring device for a vacuum circuit breaker according to claim 11, wherein, if it is determined in step S250 that the temperature has risen or fallen, the contact wear amount determination reference is changed to a contact wear amount determination reference corrected corresponding to the rising or falling temperature.

13. The correction method for the contact monitoring device for a vacuum circuit breaker according to claim 12, wherein, in step S230, the measured value of the temperature sensor is monitored in real time or periodically.

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