WO2008004400A1

WO2008004400A1 - Position detector, open/closure operation characteristic measuring device, and breaker

Info

Publication number: WO2008004400A1
Application number: PCT/JP2007/061574
Authority: WO
Inventors: Akihide Shiratsuki; Masahiro Shikai; Toshiro Nakashima; Kazuo Takashima
Original assignee: Mitsubishi Electric Corporation
Priority date: 2006-06-09
Filing date: 2007-06-07
Publication date: 2008-01-10
Also published as: JP2009198178A

Abstract

A reflecting plate (13a) is secured to the main shaft (6) movable linearly along with the stroke of a movable contact (5) when a breaker opens or breaks. The linear movement area of the reflecting plate (13a) is illuminated by an illumination optical system having a light source emitting a cone beam of light. A part of light reflected from the reflecting plate is received by a light-receiving system. According to the intensity of light received, a detection signal is outputted. A signal processing section outputs a position signal of the reflecting plate (13a) according to the detection signal. A monitoring section (15) measures the open/closure operation characteristic according to the time-series data on the position signal. Thus, an open/closure operation characteristic measuring device using a position detector easily attachable to an existing breaker is provided.

Description

Specification

Position detecting device, switching operation characteristic measuring device and circuit breaker using the same

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.

Background art

[0002] A circuit breaker that opens and closes a main circuit includes a fixed contact and a movable contact fixed to a linearly movable main shaft, and the fixed contact and the movable contact are in contact with each other by a linear movement of the main shaft. The contact is closed and 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 regular inspections, and in some cases during normal operations, the opening / closing operation characteristics, which are the stroke operations of the movable contact, are measured.

[0003] A conventional position detection device for detecting the position of a main shaft is equipped with a mechanism for converting the amount of linear motion of the main shaft into a rotation amount on the main shaft to which a movable contact is fixed, and the rotation amount is detected by a rotary encoder. Then, the position of the movable contact was measured by determining the amount of linear motion of the spindle from the amount of rotation. In addition, an open / close operation characteristic measuring device using this position detection device measures the spindle movement speed from the position data measured by this position detection device to measure the open / close operation characteristics! And Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2001-145217 (page 4, FIG. 1)

Disclosure of the invention

Problems to be solved by the invention

[0005] The conventional position detection device and the open / close operation characteristic measurement device using the same are configured as described above. Therefore, in order to install this on an existing circuit breaker, the main shaft that performs the piston motion is modified. It was necessary to disassemble a part of the circuit breaker. In addition, since the breaker is a high-voltage facility, it was necessary to consider the high voltage when placing the linear motion rotation conversion mechanism adjacent to the breaker body and the main shaft. Thus, with the prior art Since it is necessary to perform work for remodeling the spindle and to arrange it in consideration of high voltage, it is not easy to attach the conventional position detection device and switching operation characteristic measurement device to the existing circuit breaker. There was a problem!

[0006] The present invention has been made to solve the above-described problems. A position detection device that can be easily attached to an existing circuit breaker, a switching operation characteristic measuring device using the position detection device, and a breaker. The purpose is to provide a vessel.

Means for solving the problem

[0007] A position detection device according to the present invention includes a reflector fixed to a main shaft and a light source that radiates light in a conical shape, and illuminates a linearly movable range of the reflector with the light from the light source. An optical system, a light receiving optical system that receives light from the light source reflected by the reflecting plate by a detection surface of an image sensor and outputs a detection signal based on the amount of received light, and the reflection based on the detection signal And a signal processing unit that outputs a position signal of the plate.

[0008] 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 time-series data of the position signal output from the position detection device. did.

The invention's effect

[0009] According to the present invention, light is used for measuring the position of the main shaft, the reflecting plate is fixed to the main shaft, and the linearly movable range of the reflecting plate is illuminated from a position distant by the illuminating optical system. Receives the light reflected from the reflector from a position distant from the system, measures the position of the spindle with the signal processing unit based on the amount of received light, and opens and closes with the monitoring unit based on the measured position data Since the operating characteristics are measured, the reflector is simply fixed to the spindle, and no other modifications to the spindle are required. In addition, the position detector other than the reflector is a high-voltage device. Since it is possible to dispose it at a position away from the main body and main shaft of the breaker, there is no need to consider high voltage when placing the position detection device. The effect of being can be obtained.

Brief Description of Drawings

FIG. 1 shows an implementation of an opening / closing operation characteristic measuring apparatus using the position detecting apparatus according to the present invention. It is a block diagram which shows the structure which attached Form 1 to the gas circuit breaker.

FIG. 2 is a detailed configuration diagram for explaining in detail the configuration of the first embodiment of the opening / closing operation characteristic measurement device using the position detection device according to the present invention.

[FIG. 3] FIG. 3 is a detection signal intensity distribution chart in which the intensity of the detection signal output from the image sensor is plotted with the horizontal axis as the pixel position.

4] Fig. 4 is a graph showing the position signal intensity as a function of time, plotted with the horizontal axis representing the peak position of the distribution waveform of the detected signal intensity when the gas circuit breaker performs the opening operation.

[FIG. 5] FIG. 5 is a structural cross-sectional view for explaining the structure of a bead element type retroreflector. 6] FIG. 6 shows an open / close operation characteristic measuring device using the position detecting device according to the present invention. FIG. 6 is a detailed configuration diagram for explaining in detail the configuration of the second embodiment.

FIG. 7 is a detailed configuration diagram for explaining in detail another configuration of the second embodiment of the opening / closing operation characteristic measuring device using the position detection device according to the present invention.

FIG. 8 is a configuration diagram for explaining the configuration of the third embodiment of the switching operation characteristic measuring device using the position detecting device according to the present invention.

9] FIG. 9 is a configuration diagram for explaining the configuration of the embodiment 4 of the switching characteristic measurement apparatus according to the present invention.

FIG. 10 is a cross-sectional view for explaining the condensing function of the cylindrical lens. 11] FIG. 11 is a configuration diagram for explaining the configuration of the embodiment 5 of the opening / closing operation characteristic measuring device using the position detecting device according to the present invention.

12] FIG. 12 is a configuration diagram for explaining the configuration of the sixth embodiment of the opening / closing operation characteristic measuring device using the position detecting device according to the present invention.

13] FIG. 13 is a diagram for comparing and explaining the condensing characteristics of the cylindrical lens and the toroidal lens.

14] FIG. 14 is a configuration diagram for explaining the configuration of the seventh embodiment of the opening / closing operation characteristic measuring device using the position detecting device according to the present invention.

15] FIG. 15 is a configuration diagram for explaining the configuration of the eighth embodiment of the opening / closing operation characteristic measuring device using the position detecting device according to the present invention. FIG. 16 is a configuration diagram for explaining the configuration of an embodiment 9 of the switching operation characteristic measuring apparatus using the position detecting device according to the present invention.

FIG. 17 is a configuration diagram for explaining a configuration in which a folding mirror is arranged between a half mirror and an image sensor in an open / close operation characteristic measuring device using the position detection device according to the present invention. It is.

Explanation of symbols

1 bus

2 Fixed contact

3 Transmission line

4 Fixed contact

5 Movable contact

6 Spindle

13 Reflector

13a Diffuse reflector

13b Retroreflector

15 Monitoring Department

16a Illumination optics

16b Illumination optics

16c Illumination optics

16d illumination optics

16e Illumination optics

17 Light source

18a Receiving optical system

18b Receiving optical system

18c Receiving optical system

18d optical receiving system

19a lens

19b Pinhonore 19c lens

20 Image sensor

21 Signal processor

33 half mirror

101 toroidal lens

104 substrate

105 Folding mirror

106 substrates

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a position detection device, an opening / closing operation characteristic measurement device and a circuit breaker using the same according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

[0013] Hereinafter, a circuit breaker to which a switching operation characteristic measuring device using a position detection device according to an embodiment of the present invention is mounted opens and closes between a power source bus and a power transmission line for supplying power to the main circuit. A case where the gas circuit breaker is used will be described as an example.

[0014] The circuit breaker is not limited to the gas insulation system, and for example, the switching operation characteristic measurement according to the present invention is possible even if the circuit breaker is of another insulation system such as vacuum insulation, oil insulation or air insulation. The device is applicable. In addition, the circuit breaker is not necessarily opened and closed between the bus and the transmission line. For example, it may be between the transmission line and the load.

[0015] Embodiment 1.

FIG. 1 is a configuration diagram showing a configuration in which Embodiment 1 of an open / close operation characteristic measuring device using a position detection 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 the fixed contact 2 connected to the bus 1 and the fixed contact 4 connected to the power transmission line 3. The child 5 performs a stroke operation and closes when it comes into contact with the fixed contact 2 and the fixed contact 4, so that the movable contact 5 opens when it moves away from the fixed contact 2 and the fixed contact 4. It has become. [0017] 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 moved to the arrow 8 by the main shaft drive unit 7 provided at the other end of the main shaft 5. It is possible to move in both directions indicated by.

[0018] 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 insulated with sulfur hexafluoride or the like. Gas is sealed. 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. In addition, the main shaft 6 and the main shaft drive section 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 it is necessary to secure a distance from the outside. It is provided in the housing 11.

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

[0020] Next, the configuration of the switching operation characteristic measuring apparatus according to the first embodiment of the present invention attached to a gas circuit breaker will be described with reference to FIG.

[0021] A reflecting plate 13 is fixed to the spindle 6 that moves linearly in conjunction with the stroke operation of the movable contactor 5 when the gas circuit breaker is opened and closed, and corresponds to the stroke operation range of the movable contactor 5. Thus, the range in which the reflector 13 can be linearly moved is determined. In FIG. 1, the range in which the reflector 13 can be linearly moved is the range indicated by the arrow 8.

The reflector position measurement unit 14 measures the position of the reflector 13 using light, and the position signal of the reflector 13 output from the reflector position measurement unit 14 is sent to the monitoring unit 15.

Based on the time-series data of this position signal, the switching circuit operating characteristics of the gas circuit breaker are measured by the monitoring unit 15.

[0023] The 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 open / close operation characteristics, the drive control unit 12 assumes that a failure has occurred in the gas circuit breaker, and controls the drive control unit 12 to stop the open / close operation of the gas circuit breaker and generate a failure. I will inform you.

[0024] FIG. 2 shows an implementation of an opening / closing operation characteristic measurement device using the position detection device according to the present invention. FIG. 2 is a detailed configuration diagram for explaining the configuration of Form 1 in detail, in which the main shaft 6 in the gas circuit breaker shown in FIG. 1 and the reflector 13 and the reflector position measurement in the switching operation characteristic measuring device shown in FIG. 1 are measured. Part 14 is extracted. The same reference numerals as those in FIG. 1 denote the same or corresponding parts, and the description thereof is omitted.

In FIG. 2, the diffuse reflector 13a corresponds to the reflector 13 shown in FIG. 1, and diffuses and reflects the illuminated light. Therefore, 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 13 a fixed to the main shaft 6 is described in FIG. Corresponding to the stroke operation range of the movable contact 5 of FIG.

[0027] 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 movable range of the diffuse reflector 13a.

[0028] The illumination optical system 16a illuminates the linearly movable range of the diffuse reflector 13a. 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 reflected by the diffuse reflector 13a, and the condensed diffuse reflector 13a, and receives the received light amount. And an image pickup device 20 for outputting a detection signal based on the detection signal.

[0029] The lens 19a is arranged so that the light diffusely reflected by the diffuse reflector 13a 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 pinhole, a Fresnel zone plate or a concave surface is used. Needless to say, even a mirror is good.

[0031] 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. The position signal is sent to the monitoring unit 15 shown in FIG.

Note that the reflector position measurement unit 14 shown in FIG. 1 includes the irradiation optical system 16a and the light receiving optical system shown in FIG. 18a and a signal processing unit 21.

Next, the operation of this open / close operation characteristic measuring apparatus will be described in detail with reference to FIGS. 1 and 2.

[0034] 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. 2 and fixed contact 4 and away from contact.

[0035] At this time, 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. This is extremely important for ensuring reliability. If the switch cannot be opened or closed with a specified stroke, it may cause a large switching surge or a gas circuit breaker.

[0036] Therefore, the opening / closing operation characteristics as 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 during the operation at the normal operation.

[0037] Now, for example, when the gas circuit breaker is in a closed state and the transmission line 3 needs to be inspected, the force that will open the gas circuit breaker. Stroke operation is performed to separate the contact from the fixed contact 2 and fixed contact 4.

At this time, the main shaft 6 that moves linearly in conjunction with the stroke operation of the contact 5 is driven by the main shaft driving unit 7 controlled by the drive control unit 12 and is fixed to the main shaft 6 as shown in FIG. The reflecting plate 13a moves within the linearly movable range indicated by the width of the arrow 8.

[0039] The illumination optical system 16a including 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 diffuse reflector 13a moves within the linearly movable range. The light from the light source 17 is always diffusely reflected.

[0040] The light diffusely reflected by the diffuse reflector 13a is received by the light receiving optical system 18a. At that time, the lens 19a is arranged 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, so that the detection is performed as the diffuse reflector 13a moves. The image of the diffuse reflector 13a moves on the surface. The signal processing unit 21 performs signal processing on the detection signal output from the image sensor 20 reflecting the movement of the image, thereby obtaining a position signal indicating the position of the diffuse reflector 13a.

[0041] FIG. 3 shows the intensity of the detection signal output from the image sensor 20, which is a one-dimensional CCD as an example. Is a detected signal intensity distribution diagram plotted with the horizontal axis as the pixel position.

[0042] In FIG. 3, the distribution waveform of the solid line that peaks at the position of the arrow 22 shows a state where 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 peaks at the position of the arrow 23 indicates that the gas circuit breaker is open!

[0043] When the gas circuit breaker performs the opening operation, the distribution wave force S of the solid line that peaks at the position of the arrow 22 that was in the closed state, the arrow 24 along with the movement of the diffuse reflector 13a It moves in the direction shown, reaches the position of arrow 23 and enters the open state. Here, since the position of the peak of the distribution waveform and the position of the main axis 6 have a one-to-one correspondence, the force S for obtaining the position of the diffuse reflector 13a from this peak position is divided.

[0044] Fig. 4 is a position signal intensity variation diagram with time plotted with the horizontal axis representing the peak position of the distribution waveform of the detected signal intensity when the gas circuit breaker performs the opening operation.

[0045] 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 is indicated by the arrow 25 in the state where the gas circuit breaker is closed. The position signal value corresponding to the position moves over time from the position signal value corresponding to the position of the arrow 26 in the state where the gas circuit breaker is open.

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

[0047] By the way, both the movable contact 5 and the diffuse reflector 13a are fixed to the main shaft 6, and the positions where the fixed contacts are different are the positions of the movable contact 5 and the diffuse reflector 13a. The positions correspond one-to-one.

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

[0049] As described above, Embodiment 1 of the opening / closing operation characteristic measuring apparatus using the position detection apparatus according to the present invention uses light for measuring the position of the spindle 6, and at the time of the opening / closing operation of the circuit breaker. Movable contact A diffuse reflector 13a is fixed to the main shaft 6 that moves linearly in conjunction with the stroke movement of the 5 The illumination optical system 16a including the light source 17 that emits light in a conical shape illuminates a linearly movable range of the diffuse reflector 13a, and the light from the light source 17 reflected by the diffuse reflector 13a is received by the light receiving optical system 18a. An image is formed on the detection surface of the image sensor 20 by an imaging optical element, for example, a lens 19a, and a detection signal is output from the image sensor 20 based on the amount of received light of the imaged light! . Further, the monitoring unit 15 measures the opening / closing operation characteristics based on the detection signal.

[0050] 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 diffusing reflector 13a is simply fixed to the main shaft 6 and the others. There is no need to modify the main shaft 6 of the switch, and 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, which is a high-voltage device, and the main shaft 6. Since it is possible, there is no need to consider high voltage when installing the switching operation characteristic measuring device, and it is very easy to install on existing gas circuit breakers.

[0051] In the above description, the switch operating characteristic measuring device is attached to an existing gas circuit breaker. However, the switch operating characteristic is also applied to a gas circuit breaker newly installed in a power system facility. Since there is no need to consider high voltage when placing the measuring device, it is easy to install and as a result, the design of the gas circuit breaker itself is facilitated.

[0052] Embodiment 2.

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, the light diffusely reflected by the diffuse reflector 13a spreads and propagates. 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 to obtain the peak position. 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.

[0053] Furthermore, 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 is used. When If the distance from the light receiving optical system 18a constituting the reflection position measuring unit 14 is increased, the light that is reflected by the diffusing reflector 13a and spreads and propagates is condensed by the lens 19a that is an imaging optical element. However, when selecting the specifications of the lens 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 the detection signal output from the image sensor 20 is significantly reduced. Therefore, it becomes difficult to measure the switching characteristics of the gas circuit breaker.

[0054] Therefore, when a retroreflector is used instead 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 recursively reacts. Even if the distance from the launch plate to the light receiving optical system is increased, the intensity of the detection signal is greatly reduced compared to the case of the diffuse reflector 13a.

Therefore, by using the retroreflecting plate, the intensity of the detection signal output from the image sensor 20 does not significantly decrease even if the retroreflector and the detection surface of the image sensor 20 are separated. Further, since the intensity distribution of the detection signal with respect to the pixel position does not become significantly broad, it is not always necessary to use the imaging optical element, and the distance between the spindle 6 and the reflector position measurement unit 14 is greatly increased. Even if there is a need to place it, the intensity of the detection signal does not drop significantly, so it is possible to accurately measure the switching 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.

[0057] 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. It is. 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, the light exits from the beads 27 and passes through the protective layer 30 to be emitted. At this time, the outgoing angle of the outgoing light 32 emitted from the bead element type retroreflector is the same as the incident angle when the incident light 31 enters the bead element type retroreflector. Is incident light 31 This is the opposite of the propagation direction.

[0059] As described above, the bead element type retroreflector has the characteristic 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. Since it is not diffusely reflected like a reflector, the reflected light 32 spreads straight and does not propagate. Therefore, the reflected light 32 does not significantly decrease the intensity per unit area even when the distance from the bead element type retroreflector is large as compared with the case of the diffuse reflector. Has features!

FIG. 6 is a detailed configuration diagram for explaining in detail the configuration of the second embodiment of the opening / closing operation characteristic measuring device using the position detecting device according to the present invention using a retroreflecting plate as the reflecting plate. 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. Further, 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 retroreflector 13b is specularly reflected in the same direction as the incident direction and in the opposite direction, so that the reflected light 32 spreads and propagates straight without propagating. Have a special feature! /,

In FIG. 6, the illumination optical system 16 b includes a light source 17 that emits light in a conical shape and a half mirror 33, and the light from the light source 17 is reflected once by the half mirror 33 and recursively counteracted. Illuminate the direct-movable range of the firing plate 13b.

The illumination optical system 16b illuminates the linearly movable range of the retroreflector 13b, and the light specularly reflected by the retroreflector 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.

[0064] The light that is specularly reflected by the retroreflector 13b goes straight without reaching the detection surface of the image sensor 20, so that the intensity of the detection signal output from the image sensor 20 is sufficiently large. The intensity distribution of the detection signal with respect to the pixel position is not 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. The same 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.

[0066] 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, the present invention is not limited to the existing gas circuit breaker as in the first embodiment. Even if it has the effect that attachment is very easy.

[0067] Further, in Embodiment 2 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. Therefore, even if the distance between the main shaft 6 and the reflector position measurement unit 14 needs to be greatly separated from the restriction on the attachment to the gas circuit breaker, it reaches the detection surface of the image sensor 20. There is an effect that the switching operation characteristics of the gas circuit breaker can be accurately measured without the detection signal output from the image sensor 20 being significantly lowered.

[0068] Note that, in the above description, it is sufficient that the retroreflector 13b is a reflector having a retroreflective function such as the trihedral corner cube element type described as a bead element type. Not too long.

[0069] Further, in the above, the force S described for the configuration in which the radiation light of the light source 17 is reflected by the noise mirror 33 and the light transmitted through the half mirror 33 is received by the image sensor 20, as shown in FIG. The same effect can be obtained even if the light emitted from the light source 17 is transmitted through the half mirror 33 and the image element 20 receives the light reflected by the half mirror 33.

[0070] Embodiment 3.

The light receiving optical system 18b according to the second embodiment further includes an imaging optical element in order to reduce the background noise of the detection signal output from the force S including only the image sensor 20 and the image sensor 20 force. By doing so, the distance between the main shaft 6 and the reflector position measuring unit 14 can be further increased.

FIG. 8 shows a 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. Configuration diagram for explaining the configuration of the third embodiment of the open / close operation characteristic measuring apparatus using a device 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 6 denote the same or corresponding parts, and thus the description thereof is omitted.

In FIG. 8, 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 retroreflector 13b and condensed. Therefore, the light that is illuminated by the illumination optical system 16b, specularly reflected by the retroreflector 13b, and travels straight without spreading is passed through the pinhole 19b unobstructed and reaches the detection surface of the image sensor 20. You can reach.

[0073] 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 is mainly the main shaft 6 or the inner wall of the housing 11 shown in FIG. Etc., and a part of the light diffusely reflected by the main shaft 6 and the inner wall of the casing 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 this stray light reaches the detection surface of the image sensor 20, increasing the background noise of the detection signal and opening / closing operation characteristics. This may cause the measurement accuracy of the measuring device to decrease.

[0074] With respect to such stray light, the light receiving optical system 18c of Embodiment 3 includes a pinhole 19b. As described above, the pinhole 19b has a conical shape from the light source 17 of the illumination optical system 16b. The stray light that is diffused and reflected by the main shaft 6 and the inner wall of the housing 11 is spread extremely. Thus, only a part of the light can pass through the pinhole 19b and 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 device using the position detection device according to the present invention, it is possible to suppress the background noise of the detection signal caused by stray light. Compared to the case, the distance between the main shaft 6 and the reflector position measuring unit 14 can be further increased.

Embodiment 4.

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, but even if a lens is used instead of the pinhole 19b, it is caused by stray light. It is possible to suppress the background noise of the detection signal.

FIG. 9 shows a position detection device according to the present invention using a light receiving optical system 18d including an imaging element 20 and a lens 19c that is an imaging optical element instead of the light receiving optical system 18c of the third embodiment. FIG. 7 is a configuration diagram for explaining the configuration of the embodiment 4 of the open / close operation characteristic measuring device used, and the same reference numerals as those in FIG.

In FIG. 9, as in the third embodiment, the lens 19c is a position where light emitted in a conical shape from the light source 17 of the illumination optical system 16b is specularly reflected by the retroreflector 13b and condensed. It is installed in. Therefore, the light that is illuminated by the illumination optical system 16b, reflected by the retroreflector 13b, and travels straight without spreading is condensed at the position where the lens 19c is provided and passes through the lens 19c as it is. And go straight to reach the detection surface of the image sensor 20. In other words, the light trace of the mirror-reflected light by the retroreflector 13b is almost the same regardless of the presence of the lens 19c.

| BJ

Furthermore, the focal length of the lens 19c is set so that the light diffusely reflected by the retroreflecting plate 13b is collected on the detection surface of the image sensor 20. In other words, the real image of the retroreflector 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 recursive. Reflecting the position of the retroreflector 13b because not only the light that has been specularly reflected by the reflector 13b but also the light diffused and reflected by the retroreflector 13b and imaged by the lens 19c is added. The intensity of the peak of the detection signal 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 casing 11 1 returns to the reflector position measuring unit 14, and the force that becomes so-called stray light of the casing 11 1 Since the distance between the inner wall and the lens 19c and the distance between the retroreflector 13b and the lens 19c are greatly different, the light diffusely reflected by the inner wall of the housing 11 or the like depends on the lens 19c. Since it is not imaged on the detection surface, it is extremely broad with respect to the pixel position, and only increases the power without affecting the background noise of the detection signal.

[0081] Regarding the light diffusely reflected by the main axis 6, the distance between the main axis 6 and the lens 19c and recursion The distance between the reflector 13b and the lens 19c is substantially the same, and a part of the light illuminated by the illumination optical system 16b and diffusely reflected by the main axis 6 is imaged on the detection surface of the image sensor 20 by the lens 19c. Become. However, when the surface of the main shaft 6 has a diffuse reflectance that is sufficiently smaller than the diffuse reflectance of the retroreflector 13b, the light diffusely reflected by the main shaft 6 shows back-round noise of the detection signal. Only the power is increased.

[0082] As described above, by using the lens 19c as the imaging optical element, it is possible to suppress the influence of stray light caused by light diffusely reflected by the inner wall or the like of the housing, and the surface of the main axis is recursive. If it is sufficiently smaller than the diffuse reflectance of the reflective reflector! /, And has a diffuse reflectance! /, The stray light caused by the light diffusely reflected by the main axis can be regarded as sufficiently small. In the fourth embodiment of the opening / closing operation characteristic measuring apparatus using the position detecting device according to the present invention, the background noise of the detection signal caused by stray light can be suppressed, compared with the case of the second embodiment. The distance S between the main shaft 6 and the reflector position measuring unit 14 is further increased.

[0083] Embodiment 5.

In the illumination optical system 16a of the first embodiment, a force S using a light source 17 that emits light in a conical shape is used, and a cylindrical lens is provided so that light emitted from the light source 17 in a conical shape is temporarily By irradiating in the direction perpendicular to the linear motion 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, etc. As a result, the stray light that is diffused and reflected by the light can be reduced, so that the distance between the spindle 6 and the reflector position measuring unit 14 can be further increased compared to the case of the first embodiment. .

FIG. 10 is a cross-sectional view for explaining the condensing function of the cylindrical lens 34. FIG. 10 (a) is a cross-sectional view of the cylindrical lens 34 viewed from the longitudinal direction, and FIG. FIG. 10 is a cross-sectional view as viewed from the side of (a).

The cylindrical lens 34 condenses the light emitted in a conical shape from the light source 17 only on the surface viewed from the longitudinal direction of the cylindrical lens 34, as is apparent from FIG. 9 (a). As is clear from b), the surface viewed from the side in Fig. 9 (a) has the characteristic of not condensing light, and the light emitted from the light source 17 in a conical shape has an elliptical cone shape. FIG. 11 shows an opening / closing operation using the position detection device 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. FIG. 6 is a configuration diagram for explaining a configuration of a characteristic measurement device according to a fifth embodiment, in which the main shaft 6 in the gas circuit breaker shown in FIG. 1 and the reflector 13 and the reflection in the switching operation characteristic measurement device shown in FIG. The plate position measuring unit 14 is extracted. The same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, and the description thereof is omitted.

In FIG. 11, the cylindrical lens 34 is configured so that the light emitted conically from the light source 17 of the illumination optical system 16c is perpendicular to the linear movement direction of the main axis 6 and parallel to the surface of the diffuse reflector 13a. The light emitted from the light source 17 in a conical shape is arranged in a condensing direction, and is formed into 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 on the inner wall of the housing 11 can be reduced. Compared to the case, the distance S between the main shaft 6 and the reflector position measuring unit 14 is further increased.

[0089] Embodiment 6.

The illumination optical system 16b of the second embodiment, the third embodiment, or the fourth embodiment is further provided with a cylindrical lens 34, so that light emitted in a conical shape from the light source 17 is once set in the linear motion direction of the main shaft 6. If light is condensed in a direction that is vertical and parallel to the surface of the retroreflector 13b, the intensity of the light that illuminates the retroreflector 13b can be increased, and the inner wall of the housing 11 can be increased. Since stray light generated by diffuse reflection can be reduced, the distance between the spindle 6 and the reflector position measurement unit 14 is further increased compared to the case of the second embodiment, the third embodiment, and the fourth embodiment. It is possible to place them apart.

FIG. 12 shows an opening / closing operation characteristic measurement device using the position detection device according to the present invention, which uses an illumination optical system 16c including a light source 17 and a cylindrical lens instead of the illumination optical system 16b of the fourth embodiment. FIG. 6 is a configuration diagram for explaining the configuration of the sixth embodiment of the present invention, in which the main shaft 6 in the gas circuit breaker shown in FIG. 1 and the reflecting plate 13 and the reflecting plate in the switching operation characteristic measuring device shown in FIG. The position measuring unit 14 is extracted. The same reference numerals as those in FIGS. 1 and 6 denote the same or corresponding parts, and the description thereof will be omitted. In FIG. 12, the cylindrical lens 34 is configured so that the light emitted conically from the light source 17 of the illumination optical system 16c is perpendicular to the linear motion direction of the main axis 6 and parallel to the surface of the retroreflector 13b. It is arranged in the direction to collect light.

Therefore, the intensity of light illuminated by the illumination optical system 16c can be increased, and stray light that is diffusely reflected by the inner wall of the housing 11 can be reduced, so that the fourth embodiment can be reduced. Compared to the case, the distance S between the main shaft 6 and the reflector position measuring unit 14 is further increased.

[0093] Although only the case where the illumination optical system 16b of Embodiment 4 is replaced with the illumination optical system 16c has been described above, the illumination optical system 16b of Embodiments 2 and 3 is replaced with the illumination optical system. Needless to say, the same effect can be obtained even when 16c is used.

[0094] Embodiment 7.

In the illumination optical system 16c of Embodiment 5, a cylindrical lens 34 is used to condense the emitted light from the light source 17 in a direction perpendicular to the linear motion direction of the main axis 6 and parallel to the surface of the diffuse reflector 13a. If the cylindrical lens 34 is replaced with a toroidal lens having a center of rotation in a plane perpendicular to the linear motion direction of the main shaft 6 and normal to the diffuse reflector 13a, The intensity of the light that illuminates the reflector 13a can be increased, and stray light that is diffusely reflected by the inner wall of the housing 11 can be reduced. The distance between 6 and the reflector position measurement unit 14 can be further increased.

FIG. 13 is a diagram for comparing and explaining the condensing characteristics of the cylindrical lens 34 and the toroidal lens 101. FIG. 13 (a) is a perspective view showing the condensing characteristics of the cylindrical lens 34. FIG. (b) is a cross-sectional view of the cylindrical lens 34 viewed from the direction of the cylindrical rotation axis and the direction perpendicular to the light traveling direction, and FIG. 13 (c) is a diagram in which the cylindrical lens 34 in FIG. FIG. 13D is a diagram in which the cylindrical lens 34 in FIG. 13A is replaced with a toroidal lens 101. In Fig. 13 (a), as in Fig. 10, the light emitted from the light source 17 is not condensed in the longitudinal direction of the cylindrical lens 34, but spreads and travels in the longitudinal direction. As shown in the irradiation distribution 102, the irradiation distribution is a light distribution condensed in the direction perpendicular to the longitudinal direction of the lens 34. Siri Light that travels in the direction toward the center of the cylindrical lens 34 is collected by the cylindrical lens 34 Light that travels to the periphery of the cylindrical lens 34 from the light source 17 is more cylindrical than light that travels to the center. Since the reach distance to the lens 34 becomes longer, the light collecting ability decreases. Therefore, the irradiation distribution 102 does not have an oval shape, but has a shape in which the width of the central portion where the light collection efficiency is high is away from the central portion where the width is narrow, and thus a wide shape. The power density of the light is reduced at the spots.

By using 01, an elliptical irradiation distribution 103 can be obtained. The toroidal lens 101 is a lens having a curved surface obtained by rotating the cylindrical side surface of the cylindrical lens 34 around a straight line perpendicular to the rotation axis of the cylindrical side surface. The use of the toroidal lens 101 reduces the difference between the distance traveled by the light reaching the center of the toroidal lens 101 from the light source 17 and the distance traveled by the light reaching the periphery of the toroidal lens 101. The light condensing properties of are almost equal. Therefore, when the toroidal lens 101 is used, the irradiation distribution 103 has an approximately oval shape, and it is possible to suppress the decrease in power density around the irradiation distribution 103.

FIG. 14 shows measurement of opening / closing operation characteristics using the position detection device according to the present invention, in which an illumination optical system 16d including a light source 17 and a toroidal lens 101 is used instead of the illumination optical system 16c of the fifth embodiment. FIG. 7 is a configuration diagram for explaining the configuration of a device according to a seventh embodiment of the present invention, in which the main shaft 6 in the gas circuit breaker shown in FIG. 1 and the reflector 13 and the reflection in the switching operation characteristic measuring device shown in FIG. The plate position measuring unit 14 is extracted. The same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, and the description thereof will be omitted.

In FIG. 14, a toroidal lens 101 collects light emitted conically from the light source 17 of the illumination optical system 16d in a direction perpendicular to the linear motion direction of the main axis 6 and parallel to the surface of the diffuse reflector 13a. The light emitted from the light source 17 in a conical shape is formed into a rectangular shape by the toroidal lens 101.

Accordingly, the intensity of light illuminated by the illumination optical system 16d can be increased, and stray light generated by diffuse reflection on the inner wall of the housing 11 can be reduced. Compared to the case of, the distance between the spindle 6 and the reflector position measurement unit 14 is further increased. The power to do is S kurakura.

[0100] Embodiment 8.

The illumination optical system 16b of the second embodiment, the third embodiment, and the fourth embodiment is further provided with a toroidal lens 101 so that light emitted in a conical shape from the light source 17 is once perpendicular to the linear motion direction of the main shaft 6. In addition, if the light is condensed in a direction parallel to the surface of the retroreflector 13b, the intensity of the light illuminating the retroreflector 13b can be increased, and the inner wall of the casing 11 etc. Therefore, the distance between the spindle 6 and the reflector position measurement unit 14 can be further increased compared to the case of the second embodiment, the third embodiment, and the fourth embodiment. It becomes possible to arrange | position largely apart.

[0101] FIG. 15 is a diagram illustrating opening / closing operation characteristic measurement using the position detection device according to the present invention, in which an illumination optical system 16e including a light source 17 and a toroidal lens 101 is used instead of the illumination optical system 16b of the fourth embodiment. FIG. 9 is a configuration diagram for explaining the configuration of Embodiment 8 of the device, including a main shaft 6 in the gas circuit breaker shown in FIG. 1 and a reflector 13 and a reflection in the switching operation characteristic measuring device shown in FIG. The plate position measuring unit 14 is extracted. The same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, and the description thereof will be omitted.

[0102] In Fig. 15, the toroidal lens 101 has a direction in which the light emitted conically from the light source 17 of the illumination optical system 16e is perpendicular to the linear motion direction of the main axis 6 and parallel to the surface of the retroreflector 13b. It is arranged in the direction that condenses light.

Accordingly, the intensity of light illuminated by the illumination optical system 16e can be increased, and stray light that is diffusely reflected by the inner wall of the housing 11 can be reduced. Compared with the case of 4, the distance S between the main shaft 6 and the reflector position measuring unit 14 is further increased.

[0104] Although only the case where the illumination optical system 16b of Embodiment 4 is replaced with the illumination optical system 16e has been described above, the illumination optical system 16b of Embodiments 2 and 3 is replaced with the illumination optical system. The same effect can be obtained even when 16e is used.

[0105] Embodiment 9.

If the light source 17 and the image sensor 20 of Embodiments 1 to 8 are mounted on the same substrate, the substrate manufacturing process can be reduced, the number of parts of the reflector position measurement unit 14 can be reduced, and the reflector position can be measured. The production process of the fixed part 14 can be reduced and the effects can be obtained, and the cost of the reflector position measuring part 14 can be reduced.

In FIG. 16, the light source 17 and the image sensor 20 of the first embodiment are mounted on a substrate 104. In the first embodiment, the light source 17 and the image pickup device 20 are individually arranged, and each substrate needs to be manufactured and mounted. However, by mounting on the same substrate, the substrate manufacturing and the process can be reduced, and the reflecting plate is reduced. It is possible to reduce the manufacturing cost of the position measurement unit 14.

[0107] Note that, in the above, the force described for the light source 17 and the image sensor 20 of the first embodiment. Even if the light source 17 and the image sensor 20 of the second to eighth embodiments are mounted on the same substrate, the same effect can be obtained. It is done.

Furthermore, as shown in FIG. 17, a folding mirror 105 is provided between the half mirror 33 of Embodiment 2 shown in FIG. 7 and the image sensor 20, and the light source 17 and the image sensor 20 are placed on the same substrate 106. May be implemented. Here, the light source 17 and the image sensor 20 based on the configuration of the second embodiment shown in FIG. 7 and the force described on the method of mounting on the same substrate, the third, fourth, sixth, or eighth embodiment are also described. Alternatively, a folding mirror 105 may be provided between the half mirror 33 and the image pickup device 20 so that the light source 17 and the image pickup device 20 are mounted on the same substrate.

Industrial applicability

As described above, the position detection device according to the present invention and the switching operation characteristic measurement device using the same are useful when applied to a circuit breaker that opens and closes a main circuit.

Claims

The scope of the claims

[1] a reflector fixed to the main shaft;

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 light received;

And a signal processing unit that outputs a position signal of the reflecting plate based on the detection signal.

[2] The reflector is a diffuse reflector,

2. The position detection 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 diffusive reflecting plate on a detection surface of the imaging element.

[3] The irradiation optical system includes a cylindrical lens, and the cylindrical lens condenses light emitted in a cone shape 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] An irradiating optical system with a colloidal lens is provided, and the toroidal lens condenses the light emitted conically from the light source in a direction perpendicular to the linear movement direction of the main axis and parallel to the surface of the diffuse reflector. The position detection device according to claim 3, wherein

5. The imaging optical element is any one of a pinhole and a lens.

The position detection device according to any one of 2 to 4.

[6] The reflector is a retroreflector,

The illumination optical system includes a half mirror that reflects light once and illuminates a linearly movable range of the retroreflector.

2. The position detection apparatus 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.

[7] The reflector is a retroreflector,

The illumination optical system includes a half mirror that transmits light once and illuminates the linearly movable range of the retroreflector,

After the light receiving optical system is specularly reflected by the retroreflecting plate, the half mirror is The position detecting device according to claim 1, wherein the reflected light is received.

[8] The irradiation optical system includes a cylindrical lens, and the cylindrical lens collects the conical light emitted from the light source force in a direction perpendicular to the linear motion direction of the main axis and parallel to the surface of the retroreflector. The position detection device according to claim 6 or 7, wherein:

[9] An irradiating optical system colloidal lens is provided, and the toroidal lens condenses the light emitted in a conical shape from the light source in a direction perpendicular to the linear movement direction of the main axis and parallel to the surface of the diffuse reflector. The position detection device according to claim 6 or 7, wherein:

[10] The light receiving optical system includes an imaging optical element, and the imaging optical element is provided at a position where the light emitted in a conical shape from the light source is specularly reflected by the retroreflector and condensed. The position detection device according to claim 6.

11. The position detection device according to claim 10, wherein the imaging optical element is a pinhole.

12. The position detection device according to claim 10, 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.

13. The position detection apparatus according to claim 1, wherein the light source and the image sensor are on the same substrate.

[14] Place a mirror between the half mirror and the image sensor,

7. The position detection apparatus according to claim 6, wherein a real image of the retroreflecting plate is formed on the image sensor via a mirror.

[15] The position detection device according to any one of claims;! To 14, and

A monitoring unit that measures the opening and closing operation characteristics based on time-series data of the position signal of the position detection device;

An opening / closing operation characteristic measuring device comprising:

[16] A circuit breaker comprising the switching operation characteristic measuring device according to claim 15.