JP2009198178A - Position detecting device, and opening/closing motion characteristic measuring device and breaker using this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing motion characteristic device using a position detecting device which can be easily attached to an existing breaker. <P>SOLUTION: A reflecting plate 13 is fixed to a main shaft 6 which moves linearly in linkage with a stroke motion of a movable contact 5 at the time of an opening/closing motion of a breaker, and the sphere wherein the reflecting plate 13 can be moved linearly is illuminated by an illuminating optical system equipped with a light source radiating light in the shape of a cone. The light reflected by the reflecting plate is received by a light receiving optical system and a detection signal based on the amount of the received light is output therefrom. Moreover, a signal processing part outputs a position signal of the reflecting plate 13, based on the detection signal, and a monitoring part 15 measures an opening/closing motion characteristic, based on time-series data on the position signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a position detection device that measures the position of a main shaft of a circuit breaker that opens and closes a main circuit, and a switching operation characteristic measurement device and circuit breaker using the position detection device.

  The circuit breaker that opens and closes the main circuit includes a fixed contact and a movable contact fixed to the linearly movable main shaft, and is closed when the fixed contact and the movable contact come into contact with each other by the linear movement of the main shaft. The contact is opened when the fixed contact and the movable contact are separated. At that time, it is important to ensure the reliability of the circuit breaker that the position and moving speed of the movable contact are stably reproduced at and near the moment when the movable contact is opened and closed by the stroke operation. In addition, at the time of periodic inspection, or in some cases during normal operation, the opening / closing operation characteristics that are the stroke operation of the movable contact are measured.

  A conventional position detection device that detects the position of a main shaft is equipped with a mechanism that converts the amount of linear motion of the main shaft into a rotation amount on the main shaft to which a movable contact is fixed. First, the rotation amount is detected by a rotary encoder, and the rotation is detected. The position of the movable contact is measured by obtaining the amount of linear motion of the spindle from the amount. Further, the opening / closing operation characteristic measuring apparatus using the position detecting device measures the opening / closing operation characteristics by measuring the moving speed of the spindle from the position data measured by the position detecting device. (For example, refer to Patent Document 1).

JP 2001-145217 A (page 4, FIG. 1)

  Since the conventional position detection device and the switching operation characteristic measurement device using the same are configured as described above, a part of the circuit breaker is used to modify the main shaft that performs the piston motion when attaching to an existing circuit breaker. Since it is necessary to disassemble the circuit breaker and the circuit breaker is a high-voltage facility, when placing the linear motion rotation conversion mechanism adjacent to the circuit breaker body and the main shaft, the high voltage should be considered. Was necessary. Therefore, there is a problem that it is not easy to attach the conventional position detection device and the switching operation characteristic measuring device to the existing circuit breaker because it is necessary to perform work for remodeling the spindle and to arrange in consideration of high voltage. there were.

  The present invention has been made to solve the above-described problems, and provides a position detection device that can be easily attached to an existing circuit breaker and a switching operation characteristic measurement device using the position detection device. Objective.

  The position detection device according to the present invention is based on an illumination optical system including a light source that radiates light in a conical shape by fixing a reflecting plate to a main shaft that linearly moves in conjunction with a stroke operation of a movable contactor during an opening / closing operation of a circuit breaker. Based on the amount of light received by illuminating the linearly movable range of the reflector with the light from the light source, and receiving the light from the light source reflected by the reflector with a light receiving optical system on the detection surface of the image sensor. A detection signal is output. Further, the signal processing unit outputs a position signal of the reflecting plate based on the detection signal.

  In the opening / closing operation characteristic measuring apparatus using the position detection device according to the present invention, the monitoring unit measures the opening / closing operation characteristics based on the time-series data of the position signal output from the position detection device.

  According to the present invention, light is used for measuring the position of the main axis, the reflecting plate is fixed to the main axis, the range in which the reflecting plate can move directly is illuminated from the position separated by the illumination optical system, and separated by the light receiving optical system. The light reflected from the reflector is received from the position, the position of the spindle is measured by the signal processing unit based on the amount of received light, and the opening / closing operation characteristics are measured by the monitoring unit based on the measured position data. Therefore, it is not necessary to make any other modifications to the main shaft by simply attaching the reflector to the main shaft, and the body of the position detector other than the reflector is separated from the main body of the circuit breaker and the main shaft, which are high-voltage devices. Since it is possible to arrange at a position, it is not necessary to consider a high voltage when arranging the position detection device, so that it is possible to obtain an effect that it is very easy to attach to an existing circuit breaker.

  Hereinafter, the circuit breaker to which the switching operation characteristic measuring device using the position detection device according to the embodiment of the present invention is attached is a gas circuit breaker that opens and closes between the power source bus and the power transmission line for supplying power to the main circuit. A case will be described as an example.

  Note that the circuit breaker is not limited to the gas insulation system, and the switching operation characteristic measuring apparatus according to the present invention can be applied to other insulation systems such as vacuum insulation, oil insulation and air insulation. In addition, the circuit breaker is not limited to be opened and closed between the bus and the power transmission line, but may be, for example, between the power transmission line and the load.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a configuration in which Embodiment 1 of an opening / closing operation characteristic measuring device using a position detecting device according to the present invention is attached to a gas circuit breaker already provided in a power system facility or the like.

  As shown in FIG. 1, the gas circuit breaker opens and closes between a fixed contact 2 connected to the bus 1 and a fixed contact 4 connected to the power transmission line 3, and the movable contact 5 is stroked. The operation is performed to close the contact with the fixed contact 2 and the fixed contact 4, and the movable contact 5 is separated from the fixed contact 2 and the fixed contact 4 to open the contact.

  In order for the movable contact 5 to perform a stroke operation, the movable contact 5 is fixed to one end of the main shaft 6, and the main shaft 5 is indicated by an arrow 8 by the main shaft driving portion 7 provided at the other end of the main shaft 5. It is possible to move in the direction of.

  The fixed contact 2, the fixed contact 4, and the movable contact 5 are provided in a pressure vessel 9 that is a main body of the gas circuit breaker. The pressure vessel 9 is filled with an insulating gas such as sulfur hexafluoride. Has been. A shaft seal portion 10 is provided at a location where the main shaft 6 is introduced into the pressure vessel 9 so that the insulating gas does not leak from the pressure vessel 9 when the main shaft 6 moves linearly. The main shaft 6 and the main shaft driving unit 7 that drives the main shaft 6 are not sealed like the pressure vessel 9, but the gas circuit breaker itself is a high-voltage device, so that a distance from the outside can be secured. It is provided in the housing 11.

  Note that how the spindle 6 is driven is performed by the drive control unit 12 controlling the operation of the spindle drive unit 7.

  Next, the configuration of Embodiment 1 of the switching operation characteristic measuring apparatus according to the present invention attached to a gas circuit breaker will be described with reference to FIG.

  A reflecting plate 13 is fixed to the main shaft 6 that linearly moves in conjunction with the stroke operation of the movable contactor 5 during the opening / closing operation of the gas circuit breaker, and the reflecting plate corresponds to the stroke operation range of the movable contactor 5. 13 linear motion possible ranges are determined. In FIG. 1, the linearly movable range of the reflecting plate 13 is a width range indicated by an arrow 8.

  The reflection plate position measurement unit 14 measures the position of the reflection plate 13 using light, and the position signal of the reflection plate 13 output from the reflection plate position measurement unit 14 is sent to the monitoring unit 15, and this position Based on the time-series data of the signal, the switching operation characteristic of the gas circuit breaker is measured by the monitoring unit 15.

  Data on the switching operation characteristics of the gas circuit breaker obtained by the monitoring unit 15 is sent to the drive control unit 12, and the drive control unit 12 controls the spindle drive unit 7 based on this data. If there is an abnormality in the switching operation characteristics, the drive control unit 12 determines that a failure has occurred in the gas circuit breaker, and controls the drive control unit 12 to stop the opening / closing operation of the gas circuit breaker. I will inform you.

  FIG. 2 is a detailed configuration diagram for explaining in detail the configuration of the first embodiment of the switching operation characteristic measuring apparatus using the position detecting device according to the present invention, and is a main shaft in the gas circuit breaker shown in FIG. 6 and the reflection plate 13 and the reflection plate position measurement unit 14 in the opening / closing operation characteristic measurement apparatus shown in FIG. Also, the same reference numerals as those in FIG.

  In FIG. 2, a diffuse reflector 13a corresponds to the reflector 13 shown in FIG. 1, and diffuses and reflects the illuminated light. Accordingly, since the light reflected by the diffuse reflector 13a spreads and propagates over a wide range, the intensity of the light reflected significantly decreases as the distance from the diffuse reflector 13a increases.

  Further, in FIG. 2, the main shaft 6 moves linearly in both directions of the arrow 8, and the linearly movable range of the diffuse reflector 13a fixed to the main shaft 6 is the movable contact shown in FIG. Corresponding to the stroke operation range of the child 5, it is a range indicated by the width of the arrow 8.

  The illumination optical system 16a that illuminates the diffuse reflector 13a includes a light source 17 such as a lamp, an LED, or a semiconductor laser that emits light in a conical shape. Illuminates the linearly movable range 13a.

  The illumination optical system 16a illuminates the linearly movable range of the diffuse reflector 13a, and the light diffusely reflected by the diffuse reflector 13a is received by the light receiving optical system 18a. The light receiving optical system 18a receives the light from the lens 19a, which is an imaging optical element that condenses the light diffused and diffused by the diffuse reflector 13a, and the condensed diffuse reflector 13a, and receives the received light amount. And an imaging device 20 that outputs a detection signal based on the detection signal.

  The lens 19 a is arranged so that the light diffusely reflected by the diffuse reflector 13 a forms an image on the detection surface of the image sensor 20.

  In the above description, the imaging optical element is a lens. However, the imaging optical element is not limited to a lens as long as it has an imaging function. For example, a Fresnel zone plate or a concave mirror may be used. Needless to say.

  Even if the imaging optical element is a pinhole, it is possible to image the light diffusely reflected by the diffuse reflector 13a on the detection surface of the image sensor 20, but it is diffusely reflected by the diffuse reflector 13a. Since the intensity of reflected light significantly decreases as the distance from the diffuse reflector 13a increases, the detection signal output from the image sensor 20 becomes very weak when only the light that can pass through the pinhole is detected. Therefore, the opening / closing operation characteristics cannot be measured.

  Next, the detection signal output from the image sensor 20 is sent to the signal processing unit 21, and the signal processing unit 21 performs signal processing to obtain a position signal of the diffuse reflector 13a based on the detection signal, and is obtained. The position signal is sent to the monitoring unit 15 shown in FIG.

  The reflector position measuring unit 14 shown in FIG. 1 includes the irradiation optical system 16a, the light receiving optical system 18a, and the signal processing unit 21 shown in FIG.

  Next, the operation of the opening / closing operation characteristic measuring apparatus will be described in detail with reference to FIGS.

  The gas circuit breaker shown in FIG. 1 is closed when the movable contact 5 comes into contact with the fixed contact 2 and the fixed contact 4 by the stroke operation of the movable contact 5, and the movable contact 5 is fixed to the fixed contact 2 and fixed. When the contact 4 is separated, the contact is opened.

  In that case, the stroke operation of the movable contactor 5 at the moment when the gas circuit breaker is opened and closed and in the vicinity thereof is performed with high reproducibility as set in advance, thereby ensuring the performance and reliability of the gas circuit breaker. It is extremely important in the above, and if it becomes impossible to open and close with a predetermined stroke operation, there is a risk of causing a large switching surge or a failure of the gas circuit breaker.

  Therefore, the opening / closing operation characteristics that are the stroke operation of the movable contactor 5 are measured at the time of manufacturing the gas circuit breaker, at the periodic inspection, or in some cases at the time of the normal operation.

  For example, when the gas circuit breaker is in a closed state and it is necessary to inspect the power transmission line 3, the gas circuit breaker is opened. In this case, the contactor 5 is fixed. A stroke operation for pulling away from the contact 2 and the fixed contact 4 is performed.

  At that time, the main shaft 6 that linearly moves in conjunction with the stroke operation of the contact 5 is driven by the main shaft driving section 7 controlled by the drive control section 12, and the diffuse reflector 13a shown in FIG. It moves within the linearly movable range indicated by the width of the arrow 8.

  The illumination optical system 16a provided with the light source 17 that emits light in a conical shape illuminates the linearly movable range indicated by the width of the arrow 8, and the diffusive reflector 13a moves within the linearly movable range. The light from 17 is diffusely reflected.

  The light diffusely reflected by the diffuse reflector 13a is received by the light receiving optical system 18a. At that time, since the lens 19a is disposed so as to form an image on the detection surface of the image pickup device 20 such as a one-dimensional or two-dimensional CCD or photodiode array, the detection surface is moved along with the movement of the diffusive reflector 13a. The image of the diffuse reflector 13a moves on the top. The signal processing unit 21 performs signal processing on the detection signal output from the imaging element 20 reflecting the movement of the image, thereby obtaining a position signal indicating the position of the diffuse reflector 13a.

  FIG. 3 is a detection signal intensity distribution diagram in which the intensity of the detection signal output from the image sensor 20 which is a one-dimensional CCD as an example is plotted with the horizontal axis as the pixel position.

  In FIG. 3, the distribution waveform of the solid line that peaks at the position of the arrow 22 indicates a state in which the movable circuit 5 is in contact with the stationary contact 2 and the stationary contact 4 and the gas circuit breaker is closed. The broken line distribution waveform that is peaked at the position of the arrow 23 indicates a state in which the gas circuit breaker is open.

  When the gas circuit breaker performs the opening operation, the distribution waveform of the solid line that is peaked at the position of the arrow 22 in the closed state moves in the direction indicated by the arrow 24 along with the movement of the diffuse reflector 13a. Then, it reaches the position of the arrow 23 and is in an open state. Here, since the position of the peak of the distribution waveform and the position of the main axis 6 correspond one-to-one, the position of the diffuse reflector 13a can be obtained from this peak position.

  FIG. 4 is a position signal intensity time variation diagram in which the position of the peak of the distribution waveform of the detection signal intensity when the gas circuit breaker performs the opening operation is plotted with the horizontal axis as time.

  As shown in FIG. 4, when the gas circuit breaker performs the opening operation, the intensity of the position signal corresponding to the position of the diffuse reflector 13a corresponds to the position of the arrow 25 when the gas circuit breaker is closed. The value of the position signal corresponding to the position of the arrow 26 in the state where the gas circuit breaker is opened is shifted with time from the value of the position signal thus obtained.

  As described above, the position of the diffuse reflector 13 a fixed to the main shaft 6 can be obtained from the intensity of the position signal output from the signal processing unit 21.

  By the way, the movable contact 5 and the diffuse reflector 13a are both fixed to the main shaft 6, and the positions where they are fixed are different, but the positions of the movable contact 5 and the diffuse reflector 13a are different. One-to-one correspondence.

Therefore, in the monitoring unit 15 shown in FIG. 1, the opening / closing operation characteristics of the gas circuit breaker which is the stroke operation of the movable contact 5 are obtained from the position signal data output from the signal processing unit 21 and changing with time. measure. In other words, the position of the movable contact 5 and the moving speed at the position are measured from the time-series data of the position signal.

  As described above, Embodiment 1 of the opening / closing operation characteristic measuring apparatus using the position detecting device according to the present invention uses light for measuring the position of the main shaft 6, and the movable contact 5 during the opening / closing operation of the circuit breaker. A diffusive reflector 13a is fixed to the main shaft 6 that moves linearly in conjunction with the stroke operation, and an illuminating optical system 16a that includes a light source 17 that radiates light in a conical shape illuminates a linearly movable range of the diffusive reflector 13a. The light from the light source 17 reflected by the diffuse reflection plate 13a in the light receiving optical system 18a is imaged on the detection surface of the image sensor 20 by, for example, a lens 19a that is an imaging optical element, and the received light is received. A detection signal is output from the image sensor 20 based on the amount. Further, the monitoring unit 15 measures the opening / closing operation characteristics based on the detection signal.

  Since the first embodiment of the opening / closing operation characteristic measuring device using the position detecting device according to the present invention is configured as described above, the main shaft 6 is simply fixed to the main shaft 6 by simply fixing the diffuse reflector 13a. The main body of the switching operation characteristic measuring device other than the diffuse reflector 13a can be placed away from the main body of the gas circuit breaker and the main shaft 6 which are high voltage devices. Since it is not necessary to consider the high voltage in arranging the operation characteristic measuring device, there is an effect that it is very easy to attach to an existing gas circuit breaker.

  In the above description, the switching operation characteristic measuring device is attached to the existing gas circuit breaker. However, the switching operation characteristic measuring device is arranged even when it is attached to a gas circuit breaker newly installed in a power system facility or the like. Since there is no need to consider high voltage above, it is easy to install, and as a result, the gas circuit breaker itself can be easily designed.

Embodiment 2. FIG.
In the open / close operation characteristic measuring apparatus of the first embodiment, the diffuse reflector 13a is used as the reflector fixed to the main shaft 6. However, since the light diffusely reflected by the diffuse reflector 13a spreads and propagates, it is diffusely reflected. When the distance from the plate 13a to the light receiving optical system is increased, the intensity of the detection signal is remarkably lowered. At the same time, the intensity distribution of the detection signal with respect to the pixel position output from the image sensor 20 is extremely broad, and a peak position can be obtained. It becomes difficult. Therefore, it is necessary to form an image on the detection surface of the image sensor 20 using, for example, the lens 19a which is an imaging optical element that collects the spread light.

  Further, when it is necessary to dispose the main shaft 6 and the reflector position measuring unit 14 at a large distance due to restrictions on attachment to the gas circuit breaker, the diffuse reflector 13a fixed to the main shaft 6 and the reflection position measurement are required. Even if the distance from the light receiving optical system 18a constituting the unit 14 is increased, and the light that is reflected and spread by the diffuse reflector 13a is condensed by the lens 19a that is an imaging optical element, the lens In selecting the specification of 19a, there are restrictions determined by the numerical aperture, focal length, lens aperture, etc., and there is a limit to the ability to collect light, so that the detection signal output from the image sensor 20 is significantly reduced, and the gas circuit breaker It becomes difficult to measure the opening / closing operation characteristics of the.

  Therefore, when a retroreflector is used in place of the diffuse reflector 13a as the reflector 13 fixed to the main shaft 6, the light that is specularly reflected by the retroreflector travels straight without spreading and is received from the retroreflector. Even if the distance to the optical system is increased, the intensity reduction of the detection signal is significantly less than in the case of the diffuse reflector 13a.

  Accordingly, by using the retroreflecting plate, the intensity of the detection signal output from the image sensor 20 is not significantly reduced even if the detection surface of the retroreflector and the image sensor 20 are separated from each other. Since the intensity distribution of the detection signal with respect to is not significantly broad, it is not always necessary to use the imaging optical element, and the distance between the main shaft 6 and the reflecting plate position measuring unit 14 needs to be greatly separated. Even in this case, since the intensity of the detection signal does not significantly decrease, it is possible to measure the opening / closing operation characteristics.

  FIG. 5 is a structural cross-sectional view for explaining the structure of a bead element type retroreflector which is an example of a retroreflector.

  The bead element type retroreflector shown in FIG. 5 has a structure in which beads 27 formed of an optically transparent material such as glass are two-dimensionally arranged on a substrate 28 such as a resin film. . A reflection layer 29 is provided on half of the spherical surface of the bead 27, and light is reflected by the reflection layer 29. The entire surface of the bead 27 opposite to the reflective layer 29 is covered with a protective layer 30 so that the bead 27 is not damaged.

  When incident light 31, which is a plane wave, enters the bead element type retroreflector, the incident light 31 passes through the protective layer 30, enters the beads 27, and is reflected by the reflective layer 29. After being reflected by the reflective layer 29, it exits from the beads 27, passes through the protective layer 30, and exits. At this time, the exit angle of the outgoing light 32 emitted from the bead element type retroreflector is equal to the incident angle when the incident light 31 enters the bead element type retroreflector, and the propagation direction of the outgoing light 32 is incident. The direction in which the light 31 propagates is opposite.

  As described above, the bead element type retroreflecting plate has a feature that the reflected light 32 is specularly reflected in the same direction as the direction in which the incident light 31 is incident and in the opposite direction. Therefore, the reflected light 32 spreads straight and does not propagate. Accordingly, the reflected light 32 has a feature that the intensity per unit area does not significantly decrease even when the distance from the bead element type retroreflector is increased as compared with the case of the diffuse reflector. .

  FIG. 6 is a detailed configuration diagram for explaining in detail the configuration of the second embodiment of the opening / closing operation characteristic measurement device using the position detection device according to the present invention, using a retroreflection plate as the reflection plate, 1. The main shaft 6 in the gas circuit breaker shown in FIG. 1 and the reflecting plate 13 and the reflecting plate position measuring unit 14 in the switching operation characteristic measuring device shown in FIG. 1 are extracted. The same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, and thus the description thereof is omitted.

  In FIG. 6, the retroreflector 13b corresponds to the reflector 13 shown in FIG. 1, and more specifically, the bead element type retroreflector shown in FIG. As shown in FIG. 5, the retroreflecting plate 13b is specularly reflected in the same direction as the incident direction and in the opposite direction, so that the reflected light 32 spreads straight and does not propagate. Has characteristics.

  In FIG. 6, the illumination optical system 16b includes a light source 17 that radiates light in a conical shape and a half mirror 33. The light from the light source 17 is once reflected by the half mirror 33 and is reflected by the retroreflector 13b. Illuminate the linear motion range.

  The linearly movable range of the retroreflection plate 13b is illuminated by the illumination optical system 16b, and the light that is specularly reflected by the retroreflection plate 13b is received by the light receiving optical system 18b. The light receiving optical system 18b includes an image pickup device 20 that receives light that has been specularly reflected by the retroreflector 13b and travels straight.

  The light that is specularly reflected by the retroreflecting plate 13b travels straight and reaches the detection surface of the image sensor 20 without spreading, so that the intensity of the detection signal output from the image sensor 20 is sufficiently large, and further, The intensity distribution of the detection signal does not become so broad that the peak position cannot be obtained.

  Next, the detection signal output from the image sensor 20 is sent to the signal processing unit 21, and the signal processing unit 21 obtains the position signal of the retroreflector 13b based on this detection signal, as in the first embodiment. The signal processing is performed, and the obtained position signal is sent to the monitoring unit 15 shown in FIG. 1, and the switching operation characteristics of the gas circuit breaker are measured.

  Since the second embodiment of the switching operation characteristic measuring apparatus using the position detecting device according to the present invention is configured as described above, it is also attached to an existing gas circuit breaker as in the first embodiment. Is very easy.

Furthermore, in the second embodiment of the opening / closing operation characteristic measuring apparatus using the position detecting device according to the present invention, since the reflecting plate is the retroreflecting plate 13b, the reflected light travels straight without almost spreading and the imaging element 20 Even when the distance between the main shaft 6 and the reflecting plate position measuring unit 14 needs to be greatly separated due to restrictions on attachment to the gas circuit breaker, the image sensor 20 outputs the detection surface. Therefore, there is an effect that the open / close operation characteristics of the gas circuit breaker can be measured.

  In the above description, the retroreflector 13b is described as being of a bead element type, but needless to say, it may be a reflector having a retroreflective function such as a trihedral corner cube element type. .

Embodiment 3 FIG.
The light receiving optical system 18b according to the second embodiment includes only the image sensor 20. However, in order to reduce the background noise of the detection signal output from the image sensor 20, an imaging optical element may be further included. The distance between the main shaft 6 and the reflecting plate position measuring unit 14 can be further increased.

  FIG. 7 uses the position detection device according to the present invention using a light receiving optical system 18c including an imaging element 20 and a pinhole 19b as an imaging optical element instead of the light receiving optical system 18b of the second embodiment. It is a block diagram for demonstrating the structure of Embodiment 3 of an opening / closing operation characteristic measuring device, The main axis | shaft 6 in the gas circuit breaker shown in FIG. 1, and the reflecting plate 13 in the opening / closing operation characteristic measuring device shown in FIG. In addition, the reflector position measuring unit 14 is extracted. The same reference numerals as those in FIGS. 1 and 6 indicate the same or corresponding parts, and thus the description thereof is omitted.

  In FIG. 7, the pinhole 19b is provided at a position where the light radiated in a conical shape from the light source 17 of the illumination optical system 16b is reflected by the retroreflecting plate 13b and condensed. Therefore, the light that is illuminated by the illumination optical system 16b, is reflected by the retroreflecting plate 13b, and goes straight without spreading, passes through the pinhole 19b without being blocked, and reaches the detection surface of the image sensor 20. it can.

  On the other hand, of the light emitted from the light source 17 of the illumination optical system 16b, most of the light that is not specularly reflected by the retroreflector 13b illuminates the main shaft 6 or the inner wall of the housing 11 shown in FIG. Thus, a part of the light diffusely reflected by the main shaft 6 and the inner wall of the housing 11 returns to the reflector position measuring unit 14, and so-called stray light is generated. When the diffuse reflectance of the main shaft 6 and the inner wall of the housing 11 is high, a part of such stray light reaches the detection surface of the image sensor 20 to increase the background noise of the detection signal, and the opening / closing operation characteristic measuring device This will cause the measurement accuracy to decrease.

  For such stray light, the light receiving optical system 18c of the third embodiment includes the pinhole 19b. As described above, the pinhole 19b is emitted in a conical shape from the light source 17 of the illumination optical system 16b. Since the light is provided at a position where the light is specularly reflected by the retroreflecting plate 13b and collected, only a part of the stray light that is diffused and reflected by the main shaft 6 or the inner wall of the housing 11 and propagates is a pinhole. It cannot pass through 19b to reach the detection surface of the image sensor 20, and most of the stray light is blocked by the pinhole 19b.

  Therefore, in the third embodiment of the open / close operation characteristic measuring apparatus using the position detection apparatus according to the present invention, the background noise of the detection signal caused by stray light can be suppressed, compared to the case of the second embodiment. Thus, the distance between the main shaft 6 and the reflecting plate position measuring unit 14 can be further increased.

Embodiment 4 FIG.
In the third embodiment, the case where the pinhole 19b is used as the imaging optical element of the light receiving optical system 18c has been described. Even if a lens is used instead of the pinhole 19b, the background noise of the detection signal due to stray light is used. Can be suppressed.

  FIG. 8 shows an opening / closing operation using the position detection apparatus according to the present invention, in which a light receiving optical system 18d including an imaging element 20 and a lens 19c as an imaging optical element is used instead of the light receiving optical system 18c of the third embodiment. It is a block diagram for demonstrating the structure of Embodiment 4 of an operating characteristic measuring apparatus, Since the same code | symbol as FIG. 7 shows the same or equivalent part, description is abbreviate | omitted.

  In FIG. 8, the lens 19c is provided at a position where the light radiated in a conical shape from the light source 17 of the illumination optical system 16b is specularly reflected by the retroreflector 13b and condensed as in the third embodiment. Yes. Accordingly, the light that is illuminated by the illumination optical system 16b and is reflected by the retroreflector 13b and travels straight without spreading is condensed at the position where the lens 19c is provided, and passes straight through the lens 19c. And reaches the detection surface of the image sensor 20. In other words, the light trace of the light specularly reflected by the retroreflector 13b is substantially the same regardless of the presence or absence of the lens 19c.

  Further, the lens 19c has a focal length value set so that the light diffusely reflected by the retroreflector 13b is condensed on the detection surface of the image sensor 20. In other words, the real image of the retroreflection plate 13b is formed on the detection surface of the image sensor 20 by the lens 19c. Therefore, when the signal processing unit 21 obtains a position signal indicating the position of the retroreflector 13b from the detection signal output from the image sensor 20, the light received by the detection surface of the image sensor 20 is the retroreflector 13b. In addition to the light that has been specularly reflected and reached, the light diffused and reflected by the retroreflector 13b and imaged by the lens 19c is also added, so that the peak of the detection signal that reflects the position of the retroreflector 13b is added. The intensity of can be made larger than when the pinhole 19b is used as the imaging optical element of the third embodiment.

  On the other hand, a part of the light diffusely reflected by the main shaft 6 and the inner wall of the housing 11 returns to the reflector position measuring unit 14 and becomes so-called stray light. Since the distance to 19c and the distance between the retroreflector 13b and the lens 19c are greatly different, the light diffusely reflected by the inner wall or the like of the housing 11 forms an image on the detection surface of the image sensor 20 depending on the lens 19c. Since it is not performed, it is extremely broad with respect to the pixel position, and the background noise of the detection signal is increased only slightly.

  For light diffusely reflected by the main axis 6, the distance between the main axis 6 and the lens 19c and the distance between the retroreflector 13b and the lens 19c are substantially the same, and are illuminated by the illumination optical system 16b and diffused by the main axis 6. Part of the reflected light is imaged on the detection surface of the image sensor 20 by the lens 19c. However, when the surface of the main shaft 6 has a diffuse reflectance that is sufficiently smaller than the diffuse reflectance of the retroreflecting plate 13b, the light diffusely reflected by the main shaft 6 slightly reduces the background noise of the detection signal. It will only increase.

  As described above, by using the lens 19c as an imaging optical element, it is possible to suppress the influence of stray light caused by the light diffusely reflected by the inner wall of the housing, and the surface of the main axis is a retroreflector. Since the stray light caused by the light diffusely reflected by the main axis can be regarded as sufficiently small if the diffuse reflectance is sufficiently smaller than the diffuse reflectance of the present invention, the position detecting device according to the present invention is used. In the fourth embodiment of the open / close operation characteristic measuring apparatus, the background noise of the detection signal due to stray light can be suppressed, and compared with the case of the second embodiment, the main shaft 6 and the reflector position measuring unit 14. It becomes possible to arrange | position further far apart.

Embodiment 5 FIG.
In the illumination optical system 16a of the first embodiment, the light source 17 that emits light in a conical shape is used. However, a cylindrical lens is provided so that light emitted in a conical shape from the light source 17 is once linearly moved by the main shaft 6. If the light is condensed in a direction perpendicular to the direction and parallel to the surface of the diffuse reflector 13a, the intensity of the light illuminating the diffuse reflector 13a can be increased, and the inner wall of the housing 11 can be used. Since stray light generated by diffuse reflection can be reduced, the distance between the main shaft 6 and the reflecting plate position measuring unit 14 can be further increased as compared with the first embodiment.

  FIG. 9 is a cross-sectional view for explaining the light collecting function of the cylindrical lens 34, FIG. 9A is a cross-sectional view seen from the longitudinal direction of the cylindrical lens 34, and FIG. 9B is a cross-sectional view of FIG. It is sectional drawing seen from the side surface side. The same reference numerals as those in FIG. 2 denote the same or corresponding parts, and the description thereof will be omitted.

  The cylindrical lens 34 condenses the light emitted in a conical shape from the light source 17 only on the surface seen from the longitudinal direction of the cylindrical lens 34, as is apparent from FIG. 9A, and is apparent from FIG. 9B. In this way, the surface viewed from the side surface in FIG. 9A has a feature that the light is not collected, and the light emitted from the light source 17 in a conical shape has an elliptical cone shape.

  FIG. 10 shows an implementation of an opening / closing operation characteristic measuring apparatus using the position detection apparatus according to the present invention, in which an illumination optical system 16c including a light source 17 and a cylindrical lens 34 is used instead of the illumination optical system 16a of the first embodiment. 6 is a configuration diagram for explaining the configuration of the fifth embodiment, in which the main shaft 6 in the gas circuit breaker shown in FIG. 1 and the reflector 13 and the reflector position measuring unit 14 in the switching operation characteristic measuring device shown in FIG. Is extracted. The same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, and thus the description thereof is omitted.

  In FIG. 10, the cylindrical lens 34 is a direction in which light emitted conically from the light source 17 of the illumination optical system 16c is condensed in a direction perpendicular to the linear movement direction of the main shaft 6 and parallel to the surface of the diffuse reflector 13a. The light emitted in a conical shape from the light source 17 becomes an elliptical cone shape by the cylindrical lens 34.

  Therefore, the intensity of light illuminated by the illumination optical system 16c can be increased, and stray light generated by diffuse reflection at the inner wall of the housing 11 can be reduced. In comparison, the distance between the main shaft 6 and the reflector position measuring unit 14 can be further increased.

Embodiment 6 FIG.
The illumination optical system 16b of the second embodiment, the third embodiment, and the fourth embodiment is further provided with a cylindrical lens 34, so that the light emitted from the light source 17 in a conical shape is once linearly moved in the main axis 6. If the light is condensed in a direction that is perpendicular to the surface of the retroreflector 13b and parallel to the surface of the retroreflector 13b, the intensity of light that illuminates the retroreflector 13b can be increased, and the inner wall of the housing 11 can be Therefore, the distance between the main shaft 6 and the reflector position measuring unit 14 can be reduced as compared with the second embodiment, the third embodiment, and the fourth embodiment. It becomes possible to arrange them further apart.

  FIG. 11 shows an embodiment of an opening / closing operation characteristic measuring apparatus using the position detecting device according to the present invention, in which an illumination optical system 16c including a light source 17 and a cylindrical lens is used instead of the illumination optical system 16b of the fourth embodiment. It is a block diagram for demonstrating the structure of form 6, Comprising: The main axis | shaft 6 in the gas circuit breaker shown in FIG. 1, and the reflecting plate 13 and the reflecting plate position measuring part 14 in the switching operation characteristic measuring apparatus shown in FIG. It is extracted. The same reference numerals as those in FIGS. 1 and 7 indicate the same or corresponding parts, and thus the description thereof is omitted.

  In FIG. 11, the cylindrical lens 34 condenses the light emitted conically from the light source 17 of the illumination optical system 16c in a direction perpendicular to the linear movement direction of the main shaft 6 and parallel to the surface of the retroreflector 13b. It is arranged in the direction.

  Therefore, the intensity of light illuminated by the illumination optical system 16c can be increased, and stray light generated by diffuse reflection at the inner wall of the housing 11 can be reduced. In comparison, the distance between the main shaft 6 and the reflector position measuring unit 14 can be further increased.

  Although only the case where the illumination optical system 16b of the fourth embodiment is replaced with the illumination optical system 16c has been described above, the illumination optical system 16b of the second and third embodiments is replaced with the illumination optical system 16c. Needless to say, the same effect can be obtained in this case.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the structure which attached Embodiment 1 of the switching operation characteristic measuring apparatus using the position detection apparatus based on this invention to the gas circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a detailed configuration diagram for explaining in detail the configuration of a first embodiment of an opening / closing operation characteristic measurement device using a position detection device according to the present invention. It is the detection signal strength distribution diagram which plotted the intensity of the detection signal outputted from image sensor 20, with the horizontal axis as the pixel position. It is the position signal strength time change figure which plotted the position of the peak of the distribution waveform of the detection signal strength when the gas circuit breaker performs the opening operation, with the horizontal axis as time. It is structure sectional drawing for demonstrating the structure of a bead element type retroreflection board. It is a detailed block diagram for demonstrating in detail the structure of Embodiment 2 of the opening / closing operation characteristic measuring apparatus using the position detection apparatus based on this invention. It is a block diagram for demonstrating the structure of Embodiment 3 of the opening / closing operation characteristic measuring apparatus using the position detection apparatus based on this invention. It is a block diagram for demonstrating the structure of Embodiment 4 of the opening / closing operation characteristic measuring apparatus based on this invention. 4 is a cross-sectional view for explaining a light collecting function of the cylindrical lens 34. FIG. It is a block diagram for demonstrating the structure of Embodiment 5 of the opening / closing operation characteristic measuring apparatus using the position detection apparatus based on this invention. It is a block diagram for demonstrating the structure of Embodiment 6 of the opening / closing operation characteristic measuring device using the position detection apparatus based on this invention.

Explanation of symbols

5 Movable contact 6 Main shaft 13 Reflector 13a Diffuse reflector 13b Retroreflector 15 Monitoring unit 16a Illumination optical system 16b Illumination optical system 16c Illumination optical system 17 Light source 18a Light reception optical system 18b Light reception optical system 18c Light reception optical system 18d Light reception optical System 19a Lens 19b Pinhole 19c Lens 20 Image sensor 21 Signal processing unit 33 Half mirror 34 Cylindrical lens

Claims (11)

A reflector fixed to the main shaft that linearly moves in conjunction with the stroke operation of the movable contactor when the circuit breaker is opened and closed;
An illumination optical system that includes a light source that emits light in a conical shape, and that illuminates a linearly movable range of the reflector with the light from the light source;
A light receiving optical system that receives light from the light source reflected by the reflecting plate on a detection surface of an image sensor and outputs a detection signal based on the amount of received light;
A signal processing unit that outputs a position signal of the reflector based on the detection signal;
A position detection device comprising: The reflector is a diffuse reflector,
The position detecting device according to claim 1, wherein the light receiving optical system includes an imaging optical element that forms an image of light diffusely reflected by the diffuse reflector on a detection surface of the imaging element.   The irradiation optical system includes a cylindrical lens, and the cylindrical lens condenses light emitted in a conical shape from a light source in a direction perpendicular to the linear motion direction of the main axis and parallel to the surface of the diffuse reflector. The position detection device according to claim 2.   4. The position detecting device according to claim 2, wherein the imaging optical element is either a pinhole or a lens. The reflector is a retroreflector,
The illumination optical system includes a half mirror that reflects light once and illuminates the linearly movable range of the retroreflector,
The position detection device according to claim 1, wherein the light receiving optical system receives light transmitted through the half mirror after being specularly reflected by the retroreflecting plate.   The irradiation optical system includes a cylindrical lens, and the cylindrical lens condenses conical light emitted from the light source in a direction perpendicular to the linear motion direction of the main axis and parallel to the surface of the retroreflector, and has an elliptical cone shape. The position detection device according to claim 5, wherein   The light receiving optical system includes an imaging optical element, and the imaging optical element is provided at a position where light emitted in a conical shape from a light source is specularly reflected by a retroreflector and condensed. The position detection apparatus according to claim 5 or 6.   The position detection device according to claim 7, wherein the imaging optical element is a pinhole.   8. The position detecting device according to claim 7, wherein the imaging optical element is a lens that forms a real image of the retroreflecting plate on a detection surface of the imaging element. The opening / closing operation characteristic measuring apparatus according to claim 1, further comprising a monitoring unit that measures the opening / closing operation characteristics based on time-series data of the position signal. A circuit breaker comprising the open / close operation characteristic measuring device according to claim 10.

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