KR102169247B1 - Easy protective relay to pull out - Google Patents

Abstract

The present invention relates to a contact monitoring device for a vacuum circuit breaker capable of compensating for a deviation according to a temperature of a sensor for monitoring a contact wear amount, and a correction method according thereto.
According to the present invention, it is possible to detect an accurate contact wear amount by correcting the characteristic value of the photo sensor according to the operating temperature in consideration of the temperature characteristic of the photo sensor.

Description

Contact monitoring device for vacuum breaker and correction method according thereto{Easy protective relay to pull out}

The present invention relates to a contact monitoring device for a vacuum circuit breaker capable of compensating for a deviation according to a temperature of a sensor for monitoring a contact wear amount, and a correction method according thereto.

A vacuum circuit breaker is an electrical protector that protects load devices and lines from accidental currents in case of accidents such as short circuits or ground faults occurring in electric circuits using the dielectric strength of vacuum.

The vacuum circuit breaker controls power transport and protects the power system. The vacuum circuit breaker has a large breaking capacity and high reliability and safety. In addition, since it can be mounted in a small installation space, its application range is expanding from medium voltage to high voltage.

The vacuum circuit breaker includes a vacuum interrupter, which is a key component that blocks current, a power transmission device that transmits power to the vacuum interrupter, and a push rod that inputs or blocks a contact in the vacuum interrupter by making vertical reciprocation by the power transmission device. . An example of a vacuum interrupter, which is a core part of a vacuum breaker, is disclosed in Korean Patent Registration No. 10-1860348 (Registration Date May 16, 2018) (hereinafter, reference numerals cited in the description of the conventional vacuum interrupter are applied only to the description of the prior art. Sign).

The conventional vacuum interrupter 100 disclosed in the above-described prior document includes an insulating container 190, a fixed electrode 110, a movable electrode 150, and an arcing shield 210. The fixed electrode 110 and the movable electrode 150 have a fixed contact 130 and a movable contact 170, respectively. According to the vertical movement of the movable electrode 150, the movable contact 170 contacts or separates the fixed contact 130.

The fixed contact 130 and the movable contact 170 have a problem in that contact wear occurs as the current blocking operation is repeated. If the contact is worn over a certain period, it needs to be repaired or replaced. If the contact is not repaired or replaced in an appropriate time, it may cause the short-time performance, short-circuit performance, and energization performance of the vacuum interrupter to deteriorate. Therefore, it is necessary to accurately detect the wear condition of the contact point.

In addition, even if a sensor is used to detect the wear condition of the contact point, since the characteristics of the sensor may vary depending on the operating temperature, a correction method that can accurately correct it to derive a reliable detection result is also required.

An object of the present invention is to provide a contact monitoring device for a vacuum circuit breaker capable of compensating for a deviation according to the temperature of a sensor for monitoring a contact wear amount and a correction method according thereto.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not mentioned can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

The present invention is a contact monitoring device for a vacuum circuit breaker having a push rod assembly that is coupled to a movable electrode of a vacuum interrupter to raise or lower the movable electrode, and is attached to an outer circumferential surface of the push rod assembly, and the push rod assembly moves A discrimination sticker comprising a plurality of areas disposed along a direction and having a stepwise reflectance; A light-emitting unit disposed in a direction facing the discrimination sticker and emitting light toward the discrimination sticker; a light-receiving unit disposed in a direction facing the discrimination sticker and receiving light reflected from the discrimination sticker; and A photo sensor module coupled to the light receiving unit and having a circuit unit configured to process a signal from the light receiving unit to measure and process an amount of current according to the intensity of reflected light; And a data processing device that communicates with the photo sensor module and determines the amount of movement of the push rod assembly according to the amount of current sensed by the photo sensor module to calculate a contact wear amount. .

The discrimination sticker is characterized in that the boundary area in which the reflectance is different has a gradation shape.

In addition, the present invention provides a method for calibrating a contact monitoring device for an empty circuit breaker for monitoring a contact state using a voltage output value output from a photo sensor module, the method comprising: determining whether the contact state of the vacuum circuit breaker is changed (S200); If the contact state of the vacuum breaker is changed in the step S200, determining whether the vacuum breaker is changed to the contact closing state (S300); Determining the position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the photo sensor module when the contact is made in the step S300 (S400); When the position of the push rod assembly is determined in step S400, determining whether the contact state is normal when the contact is inserted and whether the contact wear amount is less than or equal to a set value according to the contact wear amount determination criterion (S500); And storing the processing result of the step S500 (S600). It provides a method of calibrating a contact monitoring device for a vacuum circuit breaker comprising a.

If the contact state of the vacuum breaker has not changed in step S200, determining whether a preset period has been reached (S210); Determining whether the vacuum circuit breaker is in an open state when the preset period is reached in step S210 (S310); When the vacuum breaker is in an open state in step S310, the open position of the push rod assembly of the vacuum breaker is measured through the voltage output value output from the photo sensor module (S330), and the vacuum breaker is opened in step S310. Measuring the closed position of the push rod assembly of the vacuum circuit breaker through the voltage output value output from the photo sensor module (S350); Compensating the contact wear amount determination standard by determining whether correction of the contact wear amount determination standard of the photosensor module is necessary according to the open position or the closed position of the push rod assembly measured in step S330 or S350 (S370); Include more.

In the steps S330, S350, and S400, the position of the push rod assembly, the open position and the closed position of the push rod assembly are determined by the photosensor module on a discrimination sticker attached to the outer peripheral surface of the rod housing of the push rod assembly. Then, it is reflected on the discrimination sticker and measured according to the current value of the photocurrent received by the photosensor module.

The discrimination sticker is disposed along a moving direction of the push rod assembly, and includes a plurality of regions whose reflectance is changed step by step.

The discrimination sticker is characterized in that the boundary area in which the reflectance is different has a gradation shape.

The photo sensor module includes a light emitting unit disposed in a direction facing the discrimination sticker and emitting light toward the discrimination sticker, a light receiving unit disposed in a direction facing the discrimination sticker and receiving light reflected from the discrimination sticker, and And a circuit unit coupled to the light emitting unit and the light receiving unit and processing a signal from the light receiving unit to measure and process a current value according to the intensity of reflected light.

It characterized in that the step S600 proceeds after the step S370.

In the step S370, if the voltage output value output from the photo sensor module is changed while the contact state of the vacuum circuit breaker is not changed, it is determined that there is a change in the external temperature, and the criteria for determining the amount of contact wear are changed.

The change in the voltage output value output from the photosensor module in step S370 is the output of the voltage output value output from the photosensor module measured in the preset period from the photosensor module measured before the preset period It is characterized in that it is determined by comparing the voltage output value.

The contact monitoring device for a vacuum circuit breaker according to the present invention and a correction method according thereto may detect the exact contact wear amount by correcting the characteristic value of the photo sensor according to the operating temperature in consideration of the temperature characteristic of the photo sensor.

In addition to the above-described effects, specific effects of the present invention will be described together while describing specific details for carrying out the present invention.

1 is a partial cross-sectional view showing a vacuum circuit breaker to which a contact monitoring device according to an embodiment of the present invention is applied.
2 is a perspective view showing an installation state of the contact monitoring device according to FIG. 1.
3 is an exploded perspective view illustrating a photo sensor of the contact monitoring device according to FIG. 1.
4 is a schematic diagram showing a discrimination sticker of the contact monitoring device according to FIG. 1.
5 is a perspective view showing an operating state of the contact monitoring device according to FIG. 1.
6 is a graph showing an example of an output characteristic according to a distance of a contact monitoring device according to the present invention.
7 is a graph showing an example of temperature characteristics of the contact monitoring device according to the present invention.
8 is a flow chart illustrating a method of calibrating a contact monitoring device according to the present invention.
9 is a graph showing the output voltage for each distance according to the temperature of the contact monitoring device according to the present invention.

The above-described objects, features, and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, one of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description 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 indicate the same or similar elements.

Hereinafter, it means that an arbitrary component is disposed on the "top (or lower)" of the component or the "top (or lower)" of the component, the arbitrary component is arranged in contact with the top (or bottom) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

1 is a partial cross-sectional view showing a vacuum circuit breaker to which a contact monitoring device according to a first embodiment of the present invention is applied. 2 is a perspective view showing an installation state of the contact monitoring device according to FIG. 1. 3 is an exploded perspective view illustrating a photo sensor of the contact monitoring device according to FIG. 1. 4 is a schematic diagram showing a discrimination sticker of the contact monitoring device according to FIG. 1. 5 is a perspective view showing an operating state of the contact monitoring device according to FIG. 1.

As shown in Figure 1, the vacuum breaker contact monitoring device (B) according to an embodiment of the present invention is installed under the main circuit portion 100 of the vacuum breaker (A) to prevent contact wear of the vacuum interrupter (130). Watch. The contact monitoring device B communicates by wired or wireless connection with the data processing device 800 installed outside the vacuum breaker A.

A brief description of the main configuration of the vacuum circuit breaker A is as follows (the configuration of the vacuum circuit breaker will be briefly described only for the configuration necessary for the description of the present invention).

The vacuum circuit breaker (A) includes a main circuit unit 100 including a vacuum interrupter 130, a push rod assembly 200 and a main shaft 300 for transmitting power to a contact point of the vacuum interrupter 130, and a driving force. It generates and is connected to the main shaft 300 and includes a mechanism assembly 400 for transmitting a driving force.

The main circuit unit 100 has a vacuum interrupter 130 installed inside the housing 110. The vacuum interrupter 130 includes an insulating container 132 forming an accommodation space, a fixed electrode 134 fixed on the inner upper portion of the insulating container 132, and a fixed contact 134a provided at an end of the fixed electrode 134. ), and a movable electrode 136 installed to be movable up and down in the inner lower part of the insulating container 132, and a movable contact 136a provided at an 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 includes the fixed electrode 134 and the fixed contact 134a, the movable electrode 136 and the movable contact 136a. Wrap around The movable contact 136a is in contact with the fixed contact 134a by the movable electrode 136 (in the inserted state) or separated from the fixed contact 134a (in the cut-off state). The movable electrode 136 is raised or lowered by the push rod 230 of the push rod assembly 200.

The push rod assembly 200 inserts or blocks the movable electrode 136. The push rod assembly 200 is composed of several shafts and springs that transmit the power of the main shaft 300 to the movable electrode 136. A partial configuration of a contact monitoring device B, which will be described later, is installed 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.

The main shaft 300 is connected to the mechanism assembly 400 to transmit power generated from the mechanism assembly 400 to the push rod assembly 200.

2 and 3, the contact monitoring device (B) according to an embodiment of the present invention includes a sensor assembly 500 installed under the main circuit unit 100 and an outer peripheral surface of the rod housing 210 A discrimination sticker 700 attached to the device includes a data processing device 800 for overall control and determination.

The sensor assembly 500 includes a photo sensor module 510 for detecting the position of the identification sticker 700, a sensor holder 530 accommodating the photo sensor module 510, and the sensor holder 530 as a main circuit unit 100 ) And a sensor bracket 550 coupled to the lower side.

The photosensor module 510 includes a light emitting unit 512 and a light receiving unit 514, and a circuit unit 516 processing signals from the light emitting unit 512 and the light receiving unit 514. The light emitting part 512 and the light receiving part 514 are installed side by side on one surface of the circuit part 516. The photo sensor module 510 is installed so that the light emitting part 512 and the light receiving part 514 face the rod housing 210 of the push rod assembly 200. The meaning of the installation direction of the photo sensor module 510 will be described later.

The photo sensor module 510 is a type of optical sensor that emits light from the light emitting unit 512 and senses the amount of light returned by the emitted light reflected on the surface of the discrimination sticker 700 by the light receiving unit 514.

Therefore, since the photocurrent proportional to the intensity of light flows, the amount of current generated increases as the amount of reflected and returned light increases. The circuit unit 516 converts the photocurrent value into a voltage value and transmits the changed voltage value to the data processing device 800. However, depending on settings or necessity, the current value may be transferred to the data processing apparatus 800 as it is and used as a criterion for determination. Since the photo sensor module 510 detects the amount of light emitted from the light emitting unit 512 is reflected and incident, the amount of light reflected and incident to the light receiving unit 514 decreases as the distance from the photo sensor module 510 increases. As the amount of incident light decreases, the photocurrent decreases, so the voltage value decreases. Therefore, based on this, the distance from the photo sensor module 510 to the object to be detected can be known.

The sensor holder 530 accommodates the photo sensor module 510. The sensor holder 530 may have a box shape with one side open. The light emitting part 512 and the light receiving part 514 of the photo sensor module 510 are exposed to the open side of the sensor holder 530. The sensor holder 530 may be provided with a coupling portion 532 coupled to the sensor bracket 550 on the open side and the other side or side portions of the opposite side. The coupling part 532 may be provided in the form of a hole into which a bolt is inserted.

The sensor holder 530 may have a frame shape such as a'b' shape, a'b' shape, and a'c' shape instead of a box shape if the photo sensor module 510 is inserted and not separated.

The sensor bracket 550 is mounted on a lower side of the housing 110 forming the exterior of the main circuit part 100. The sensor bracket 550 is not limited to its shape as long as it can support the sensor holder 530. However, in the present invention, the installation position of the photo sensor module 510 must face the rod housing 210. Therefore, the sensor bracket 550 has an inverted'L' shape, and the sensor holder 530 is coupled to a surface extending downward from the housing 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 housing 110 may be formed on the plate surface of the sensor bracket 550. The sensor bracket 550 may be coupled to the sensor holder 530 and the housing 110 by bolting or the like.

In the above-described embodiment, the sensor holder 530 and the sensor bracket 550 are separately provided as an example. However, as long as the photo sensor module 510 can be accommodated and coupled to the housing 110 of the main circuit unit 100, one fixing means may be used.

As shown in FIG. 4, the discrimination sticker 700 is a sticker attached to the outer peripheral surface of the rod housing 210. The discrimination sticker 700 has a rectangular shape having a predetermined size. The discrimination sticker 700 is attached in a direction toward the photo sensor module 510. The discrimination sticker 700 may be formed in a gradation form from black to white from top to bottom along a vertical direction with reference to FIG. 4. Conversely, the discrimination sticker 700 may be formed in a gradation form from black to white from the bottom to the top. That is, the discrimination sticker 700 is formed so that the reflectance in a certain area is different from that in other areas so that the photo sensor module 510 can distinguish and sense it.

The reason that the uppermost end of the discrimination sticker 700 is black and the lowermost end of the discrimination sticker 700 is white is to clarify the boundary between the periphery to which the discrimination sticker 700 is attached so as not to be affected by the surrounding color. Black and white regions may be formed at about 10% of the uppermost and lowermost regions of the discrimination sticker 700, and the remaining regions may be formed in a gradient. However, in the discrimination sticker 700, the entire area including both the top and bottom ends may be formed as a gradation (in this case, the initial detection position or the attachment position is adjusted so that the detection is made within a range not affected by the surrounding color. Can). The attachment position of the identification sticker 700 is adjusted so that the detection area of the photo sensor module 510 exists in the gradation area excluding black and white of the identification sticker 700.

In this way, when the discrimination sticker 700 is configured in a gradation form, the current value of the reflected light gradually changes when passing the boundary of each region.

In the present invention, the discrimination sticker 700 is a sticker for discriminating whether the fixed contact 134a and the movable contact 136a are worn by a certain amount or more and the elevation height of the push rod 230 is changed (in the present invention, the'contact wear amount The term'is defined as the displacement at which the push rod rises due to the wear of the fixed contact and the movable contact by input. It is difficult to directly measure the lift displacement of the push rod. do).

The discrimination sticker 700 is set as a region where the open position of FIG. 2 reflects light emitted from the photo sensor module 510 in a contact blocking state. In addition, light emitted from the photo sensor module 510 may be reflected at a close position (refer to FIG. 5) of the discrimination sticker 700 in the contact input state. An area reflecting light emitted from the photo sensor module 510 on the discrimination sticker 700 is set in an open position, an input position, and an area adjacent to the input position of FIG. 4.

Meanwhile, current values corresponding to the open and closed positions of the discrimination sticker 700 measured by the photosensor module 510 are transmitted to the data processing apparatus 800. 2 and 5, the data processing device 800 is installed outside the vacuum circuit breaker A to communicate with the photo sensor module 510. The data processing device 800 determines the position of the push rod assembly 200 through data measured by the photosensor module 510. In addition, the data processing device 800 determines the amount of contact wear through the position of the push rod assembly 200 and determines whether to warn a user. The data processing device 800 also serves to set a criterion for determining the amount of contact wear necessary for determining the amount of contact wear and correct it according to the temperature. Detailed functions of the data processing device 800 will be described later.

In the contact monitoring apparatus according to an embodiment of the present invention having the above-described configuration, a method of detecting a contact wear amount using a photo sensor module will be described in detail as follows.

Since the push rod assembly 200 is operated in the vertical direction, which is the vertical direction of FIG. 2, it always maintains the same position in the contact blocking state (open position). In the first input state, the push rod assembly 200 exhibits a certain amount of vertical displacement (close position). After the first input, the closed state is maintained until an accident current occurs or the contact is cut off for inspection. Therefore, contact wear does not occur.

However, when the contact is worn a plurality of times after the contact is blocked and reinserted, the push rod assembly 200 rises along the vertical direction by the amount of wear. That is, the vertical displacement of the push rod assembly 200 becomes the contact wear amount.

In order to measure the amount of movement of the push rod assembly 200, the vertical displacement of the push rod assembly 200 must be sensed. To this end, it is preferable to install a sensor capable of detecting a vertical displacement under the push rod assembly 200. However, since the main shaft 300 is coupled to the lower side of the push rod assembly 200 and the lower components of the vacuum breaker A exist, it is difficult to secure a sufficient space for installing the sensor.

Therefore, the photosensor module 510 of the present invention is installed adjacent to the outer circumferential surface of the rod housing 210 and is installed on one side parallel to the vertical movement direction of the push rod assembly 200. In addition, in order to minimize interference with the peripheral portion, the photosensor module 510 is installed in a portion close to the outside from the lower end of the housing 110 of the main circuit portion 100.

Since the push rod assembly 200 has only displacement in the vertical direction and does not move in the horizontal direction, the vertical displacement of the push rod assembly 200 cannot be detected even if the photo sensor module 510 is installed on one side. In order to solve this problem, in this embodiment, the photo sensor module 510 can be used by generating the same effect as converting the vertical displacement of the push rod assembly 200 into a horizontal displacement by applying the discrimination sticker 700. To be.

As shown in FIG. 2, the discrimination sticker 700 is attached on the outer circumferential surface of the rod housing 210 facing the photo sensor module 510. In this case, a position at which light emission and light reception of the photo sensor module 510 is performed (hereinafter, a sensing position) in the contact blocking state corresponds to an open position (open position) of the identification sticker 700. In the contact cut-off state, the positions where light emission and light are received are always the same. In addition, the initial position at which light emission and light reception of the photo sensor module 510 is performed in the contact input state corresponds to a close position of the identification sticker 700. The sensing position of the photo sensor module 510 is the same until the amount of contact wear occurs.

As the amount of contact wear increases, when the load housing 210 rises, the sensing position of the photo sensor module 510 gradually changes. Since the discrimination sticker 700 is in the form of a gradation, when the positions of light emission and light reception are different, the current value of the reflected light also changes.

As the contact wear amount increases as the input is repeated, the rod housing 210 gradually rises, as shown in FIG. 5. As the rod housing 210 rises, the discrimination sticker 700 also rises. Since the positions of the light-emitting unit 512 and the light-receiving unit 514 of the photo sensor module 510 are fixed, the sensing position gradually decreases as the discrimination sticker 700 rises (it is lowered than the close position in FIG. 5). . Referring to the discrimination sticker 700 of FIG. 4, since the sensing position is toward the white area of the discrimination sticker 700, the current value of the reflected light gradually increases as the amount of contact wear increases. Since black is a color that absorbs light, the amount of reflected light increases as it goes toward white, and the amount of current increases. Accordingly, since the voltage value converted from the current value also gradually increases, the vertical displacement of the load housing 210 in the data processing apparatus 800 can be determined based on this.

If the voltage value or the current value measured by the photosensor module 510 reaches the threshold value, the data processing device 800 may determine that the contact wear amount has reached the threshold value and inform the user of this. In addition, the data processing device 800 may correct the contact wear amount according to the temperature change (this will be described later).

The photo sensor module 510 cannot directly detect vertical displacement, but a change in reflectance according to a change in contrast of the discrimination sticker 700 exhibits an effect of converting vertical displacement into horizontal displacement. Therefore, by applying the photo sensor module 510, it is possible to indirectly monitor and detect the amount of contact wear.

The contact wear amount monitored by the photo sensor module 510 may be monitored in real time or at a preset time period. The output value of the photosensor module 510 is transmitted to the data processing device 800 to be processed and analyzed. Accordingly, it is possible to determine the amount of wear of the contact before the amount of wear of the contact exceeds the threshold value, so that an appropriate maintenance time can be known. In addition, it is possible to improve the reliability and performance of the vacuum circuit breaker.

6 is a graph showing an example of an output characteristic according to a distance of a contact monitoring device according to the present invention.

As shown in FIG. 6, there is a section in which an output value (relative collector current) linearly appears according to a distance from a reflective surface on which light emitted from the photo sensor module 510 is reflected. For example, when there is a reflective surface within a distance of 1.0 to 2.0 (PU) of the photosensor module 510, the output value may appear linearly.

However, in the present invention, the photo sensor module 510 is used to measure the displacement in the vertical direction as described above, not to measure the moving displacement in the horizontal direction. Accordingly, a section in which the output value of the photo sensor module 510 indicates linearity is applied to the discrimination sticker 700 to set the light emission and light reception positions and the close position of the photo sensor module 510. That is, the position of the discrimination sticker 700 may be set so that the detection position and the close position of the photo sensor module 510 do not deviate from a section in which the output value of the photo sensor module 510 indicates linearity.

In the contact monitoring device of the present invention having the above-described configuration, the photo sensor module used to detect the contact wear amount may have different operating characteristics depending on the ambient temperature.

7 is a graph showing an example of temperature characteristics of the contact monitoring device according to the present invention.

In the case of the photo sensor module 510, although there is a difference according to the type, in general, it has a temperature characteristic as shown in FIG. 7. Since the photo sensor module 510 is a sensor that measures displacement by emitting and receiving light, the size of the photocurrent varies according to the amount of received light. The relative current conversion rate according to the temperature of the photo sensor module 510 gradually increases from -20 degrees Celsius to 40 degrees Celsius, and then decreases again at 40 degrees or more.

The temperature conditions according to the operating environment of the vacuum circuit breaker (A) in the actual field range from minus 5 degrees Celsius to 40 degrees Celsius. However, as shown in FIG. 6, at a temperature of -20 degrees Celsius and 40 degrees Celsius, the output of the photo sensor module 510 may have a deviation of 10% or more. Since the photo sensor module 510 is also operated within the operating environment temperature range of the site, an error of up to 10% or more may occur according to temperature changes.

Therefore, if the output characteristic of the photo sensor module 510 according to the temperature characteristic is not considered, even if the monitoring position is the same, a difference occurs in the output value of the photo sensor module 510 according to the ambient temperature. If the contact wear amount is monitored using the output value of the photo sensor module 510 without proper correction according to temperature, an inaccurate result is obtained.

In order to solve this problem, the output value of the photo sensor module 510 is periodically measured, and the output value is corrected by reflecting the characteristic according to the temperature, thereby obtaining an accurate contact wear amount.

Hereinafter, a method of calibrating the contact monitoring device for a vacuum circuit breaker capable of compensating for the deviation of the output value of the photo sensor module according to the operating temperature will be described in detail (hereinafter, the controlling entity of each step is the data processing device In addition, it has been described that the data processing device controls based on a signal obtained by changing the current value of the reflected light detected by the photo sensor module into a voltage value, but this is only an example, and the current value is used as a control standard. Sanya is okay.).

8 is a flow chart illustrating a method of calibrating a contact monitoring device according to the present invention. 9 is a graph showing the output voltage for each distance according to the temperature of the contact monitoring device according to the present invention.

As shown in FIG. 8, the data processing apparatus 800 determines whether the contact state of the vacuum circuit breaker A is changed in the measurement standby state (S100) of the photo sensor module 510 (S200 ). The meaning that the contact state of the vacuum circuit breaker (A) has changed means when there is a change from an open state, which is a contact breaking state, to a contact closing state, or a change from the closing state to an open state. When the contact state is changed, the voltage value output from the photo sensor module 510 is changed. However, when there is no change in contact point, since the sensing position of the photo sensor module 510 is the same, there should be no change in voltage value even if the measurement is performed periodically. Therefore, the data processing apparatus 800 first determines whether the contact state of the vacuum circuit breaker A is changed.

If the contact state of the vacuum circuit breaker (A) is changed in step S200, the data processing device 800 determines whether the movable contact point (136a) of the vacuum circuit breaker (A) has changed to the contact input state in contact with the fixed contact (134a). Do (S300). Since contact wear does not occur in the contact blocking state and contact wear occurs only in the contact closing state, it is determined whether or not it has been changed to the contact closing state in step S300.

If the contact is made in step S300, the position of the push rod assembly 200 is determined through the voltage output value output from the photo sensor module 510 (S400). That is, as described above, the amount of current that varies depending on the amount of light reflected from the discrimination sticker 700 attached to the load housing 210 is changed to a voltage value in the circuit unit 516 of the photo sensor module 510, and this is The position of the push rod 230 is determined by analyzing and measuring the position in the processing device 800 (locating the position of the push rod by determining the position of the rod housing 210 of the push rod assembly).

When the rod housing 210 is moved from the open position to the initial input position, the position where the light emitted from the light emitting unit 512 is reflected is moved from the open position of the discrimination sticker 700 to the close position. Since the discrimination sticker 700 has a gradation shape, the amount of light in the open position and the close position is different, and the voltage value according to the photocurrent value is different. Therefore, the displacement of the rod housing 210 can be known through the output voltage value output from the photo sensor module 510, and the push rod 230 that drives the actual movable contact 136a through the displacement of the rod housing 210 You can calculate the displacement of

When 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 wear amount of the contact is less than the set value (S500). The determination of the contact state and whether the contact wear amount is less than or equal to the set value in the data processing device 800 is based on a pre-stored contact wear amount determination criterion. The criterion for determining the amount of contact wear may be stored in the data processing apparatus 800 in the form of a graph of FIG. 9 or a data form capable of deriving the graph of FIG. 9.

Thereafter, the above-described signal processing result and calculation result are stored (S600), and the same process is repeated.

If the contact state of the vacuum circuit breaker A has not changed in the above-described step S200, it is determined whether a preset period has been reached (S210). When the preset period is reached, the data processing apparatus 800 determines whether the vacuum circuit breaker A is in an open state (S310).

If the vacuum circuit breaker A is open in step S310, the open position of the push rod 230 is measured through the voltage output value output from the photo sensor module 510 (S330). In step S310, if the vacuum circuit breaker A is not in an open state, the closed position of the push rod 230 is measured through a voltage output value output from the photo sensor module 510 (S350).

When measuring the open position and the close position at the time of the first input, a voltage output value graph having a certain slope (a) can be derived as shown in FIG. 9. The voltage output value of the photosensor module 510 according to the moving distance of the rod housing 210 is shown as a graph in the form of a straight line. The x-axis of the graph is the moving distance of the discrimination sticker 700 when moving from the open state to the closed state. The y-axis is a voltage output value output from the photo sensor module 510 at the time of measurement.

According to the open position and the closed position of the push rod 230 measured in step S330 or S350, it is determined whether correction is necessary for the determination criterion for the amount of contact wear by temperature, and if there is a temperature change, the criterion for determining the amount of contact wear is corrected (S370). If the criterion for determining the amount of contact wear has been corrected, step S600 is performed.

Whether or not correction is required for the criterion for determining the amount of contact wear can be determined as follows.

If the voltage output value of the photo sensor module 510 is measured in the open position, which is the first open state, and the voltage output value of the photo sensor module 510, is measured in the close position, which is the initial closed state under test conditions after manufacturing the vacuum circuit breaker (A). , A graph of the voltage output value of the photo sensor module 510 at the test temperature can be obtained. For example, if the test condition is 20 degrees Celsius, since the x-axis and y-axis values are known, the b1 graph of FIG. 9 can be derived through a linear equation of ax+b=y. Similarly, if the test condition is 15 degrees Celsius, the b2 graph can be derived, and if the test condition is 30 degrees Celsius, the b3 graph can be derived.

In this way, the voltage output value data of the photo sensor module 510 for each operating temperature of the vacuum circuit breaker A may be pre-stored in the data processing device 800 after testing in advance under various temperature conditions. Alternatively, the data processing device 800 stores the voltage output value data of the photo sensor module 510 derived under one temperature condition, and if necessary, a new graph is derived from the data processing device 800 as a standard for determining the amount of contact wear. I can take it.

In more detail, since the voltage output value graph represents the contact state, the voltage output value does not change unless the state of the contact is changed. Therefore, according to a change in temperature condition, a graph having the same slope, such as b1 or b2, may be used as a criterion for determining the state of the photo sensor module 510.

That is, if the voltage output value output from the photosensor module 510 is changed even though the state of the contact has not changed, it is determined that there is a change in the external temperature and the graph of the reference voltage output value is changed.

After installing the vacuum circuit breaker (A) on the site, the voltage output value of the photo sensor module 510 is measured in the open position. In the open state, since the push rod 230 does not move, the rod housing 210 and the identification sticker 700 also do not move. After that, when the contact is closed while the temperature of the site is not changed, the voltage output value of the photo sensor module 510 is measured at the close position, which is the closed state. Based on the measured values, a graph corresponding to the temperature of the site can be derived.

For example, it may be assumed that the reference graph derived based on the voltage output value of the photosensor module 510 in the field is b1. If the contact point of the vacuum circuit breaker (A) is not changed to the close state according to steps S210, S310, and S350 described above, and the result of measuring the voltage output value of the photo sensor module 510 is C1, the contact corresponding to the voltage output value C1 Since the wear amount x1 is the same as the contact wear amount at the close position, the data processing device 800 may determine that the temperature of the site has not changed. In this case, keep the b1 graph as a criterion for determining the amount of contact wear.

If the voltage output value of the photo sensor module 510 is measured at a preset period and the contact state has not changed and the voltage output value is measured as C2, the data processing device 800 may determine that the temperature of the site has increased. In this case, if there was no temperature change, C2 should be at the same position as C1, but this is because the voltage output value appeared as C2 due to the temperature increase. At this time, I measured C2?? If the output value is determined based on the b1 graph, the contact wear amount appears as x2, so it is erroneously judged that the contact wear amount has exceeded the threshold value even though the contact wear amount did not exceed the threshold value (Max). Therefore, the data processing apparatus 800 does not use the b1 graph as a criterion for determining the contact wear amount, but moves the graph again by the y-intercept value changed from C1 to C2, and uses the graph b3 as a criterion for determining the contact wear amount.

Conversely, if the contact state has not changed and the voltage output value of the photo sensor module 510 is measured as C3, the data processing device 800 may determine that the temperature of the site has decreased. In this case, if there was no temperature change, C3 should be at the same position as C1, but this is because the voltage output value appeared as C3 due to a temperature drop. At this time, if the voltage output value measured by C3 is determined based on the b1 graph, the contact wear amount appears as x3, so the contact wear amount is incorrectly judged. Therefore, the data processing apparatus 800 does not use the b1 graph as a criterion for determining the contact wear amount, but moves the graph again by the y-intercept value changed from C1 to C3, and uses the graph b2 as the determination criterion for the contact wear amount.

However, even if there is no temperature change, the voltage output value will be different if the contact wear amount increases due to the contact injection occurring several times. In this case, since the temperature has not changed, the criteria for determining the amount of contact wear are not corrected.

The wear of the contact occurs only when the contact is closed, and the contact is always opened before the contact is closed. Since the position of the push rod 230 is always the same in the contact open state, the voltage value does not change and always appears the same. Therefore, a reference graph is set by measuring the voltage value of the photo sensor assembly 510 in the contact open state, and when contact wear occurs due to contact input, the contact wear amount according to the voltage output value is compared with the reference graph at the immediately previous contact open state. I can judge.

As described above, if the criterion for determining the amount of wear of the contact point according to the temperature is not corrected, even if the amount of wear of the contact point exceeds the preset maximum, it may not be accurately determined. Conversely, it can be determined that the contact wear amount has reached the maximum value even though the preset maximum value has not been reached.

Therefore, in order to prevent such a problem, if it is determined that a temperature change has occurred by periodically checking the voltage output value of the photosensor module 510, a criterion for determining the amount of contact wear may be determined by correcting the reference graph.

The difference between the distance value corresponding to the voltage output value of the photo sensor module 510 measured when inputting once and the distance value corresponding to the voltage output value of the photo sensor module 510 measured when inputting twice becomes the contact wear amount. When the contact wear amount reaches the maximum value, the data processing device 800 may be set to output a warning message to the user. Alternatively, before the contact wear amount reaches the maximum value, the data processing device 800 may be set to output a warning message to the user.

For example, when the maximum value of the contact wear amount is set to 5mm, it may be set to output a warning message to the user when the contact wear amount becomes 5mm or 4.8mm.

The above-described present invention is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those of ordinary skill in the technical field to which the present invention belongs. Is not limited by

A: Vacuum circuit breaker
100: main circuit unit 110: housing
130: vacuum interrupter 134: fixed electrode
136: movable electrode 200: push rod assembly
210: rod housing 300: main shaft
B: contact monitoring device
500: sensor assembly 510: photo sensor module
512: light emitting unit 514: light receiving unit
516: circuit part 700: discrimination sticker
800: data processing unit

Claims (10)

In the contact monitoring device for a vacuum circuit breaker having a push rod assembly coupled to the movable electrode of the vacuum interrupter to raise or lower the movable electrode,
A discrimination sticker attached to an outer circumferential surface of the push rod assembly, disposed along a moving direction of the push rod assembly, and configured of a plurality of regions whose reflectance is changed stepwise;
A light-emitting unit disposed in a direction facing the discrimination sticker and emitting light toward the discrimination sticker; a light-receiving unit disposed in a direction facing the discrimination sticker and receiving light reflected from the discrimination sticker; and A photo sensor module coupled to the light receiving unit and having a circuit unit configured to process a signal from the light receiving unit to measure and process an amount of current according to the intensity of reflected light; And
Communicates with the photo sensor module, calculates the amount of contact wear by determining the amount of movement of the push rod assembly according to the amount of current detected by the photo sensor module, and determines whether the amount of contact wear is less than the set value according to the pre-stored contact amount determination criteria A data processing device;
Including,
The data processing device
According to the position of the push rod assembly, the contact wear amount determination criterion is determined by determining whether correction is necessary to correct the contact wear amount determination criterion.
Contact monitoring device for vacuum breaker.
The method of claim 1,
The above differentiation sticker
Characterized in that the boundary region in which the reflectance is different is in a gradation
Contact monitoring device for vacuum breaker.
In the correction method of a contact monitoring device for a vacuum circuit breaker that monitors a contact state using a voltage output value output from a photo sensor module,
Determining whether to change the contact state of the vacuum breaker (S200);
If the contact state of the vacuum breaker is changed in the step S200, determining whether the vacuum breaker is changed to the contact closing state (S300);
Determining the position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the photo sensor module when the contact is made in the step S300 (S400);
When the position of the push rod assembly is determined in step S400, determining whether the contact state is normal when the contact is inserted and whether the contact wear amount is less than or equal to a set value according to the contact wear amount determination criterion (S500); And
Storing the processing result of the step S500 (S600);
Including
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 3,
If the contact state of the vacuum breaker has not changed in step S200, determining whether a preset period has been reached (S210);
Determining whether the vacuum circuit breaker is in an open state when the preset period is reached in step S210 (S310);
When the vacuum breaker is in an open state in step S310, the open position of the push rod assembly of the vacuum breaker is measured through the voltage output value output from the photo sensor module (S330), and the vacuum breaker is opened in step S310. Measuring the closed position of the push rod assembly of the vacuum circuit breaker through the voltage output value output from the photo sensor module (S350);
Correcting the contact wear amount determination criterion by determining whether correction of the contact wear amount determination criterion of the photosensor module is necessary according to the open position or the close position of the push rod assembly measured in step S330 or S350 (S370);
Further comprising
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 4,
In the steps S330, S350, and S400, the position of the push rod assembly, the open position and the closed position of the push rod assembly are determined by the photosensor module on a discrimination sticker attached to the outer peripheral surface of the rod housing of the push rod assembly Then, it is measured according to a current value of a photocurrent reflected by the identification sticker and received by the photosensor module or a voltage output value obtained by converting the current value.
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 5,
The above differentiation sticker
It is arranged along the moving direction of the push rod assembly, characterized in that consisting of a plurality of regions whose reflectance varies step by step
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 6,
The above differentiation sticker
Characterized in that the boundary region in which the reflectance is different is in a gradation
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 5,
The photo sensor module
A light-emitting unit disposed in a direction facing the discrimination sticker and emitting light toward the discrimination sticker; a light-receiving unit disposed in a direction facing the discrimination sticker and receiving light reflected from the discrimination sticker; and And a circuit unit coupled to the light receiving unit and processing a signal from the light receiving unit to measure and process a current value according to the intensity of reflected light
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 4,
Characterized in that the step S600 proceeds after the step S370
Calibration method of contact monitoring device for vacuum circuit breaker.
The method of claim 4,
In step S370
If the voltage output value output from the photo sensor module is changed while the contact state of the vacuum breaker is not changed, it is determined that there is a change in the external temperature and the criteria for determining the amount of contact wear are changed.
Calibration method of contact monitoring device for vacuum circuit breaker.

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