Movable part travel measurement method of gas insulation switchgear, operation deterioration diagnostic method of gas insulation switchgear, and maintenance method of gas insulation switchgear

Abstract

To easily perform stroke measurement even for a disconnecting switch and a grounding switch, regardless of a newly delivered article and an already delivered article.SOLUTION: In a disconnecting switch 10 with an inspection window 12 by which travel of a movable part in a tank (cylindrical vessel) 11 with insulation gas encapsulated inside can be visually inspected, a photographing part 20 is installed by facing the inspection window 12, a slide pattern appearing in the movable part by rubbing against a current collector provided in a stationary part in the tank 11 is photographed by the photographing part 20 in the travel of the movable part in the tank 11, and the travel of the movable part is measured on the basis of the slide pattern photographed by the photographing part 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for measuring the moving amount of a movable part of a gas-insulated switchgear, a method for diagnosing the operation deterioration of a gas-insulated switchgear, and a maintenance method for a gas-insulated switchgear.

Background Art

[0002] A gas-insulated switchgear (GIS) is a facility installed in a substation, which is a relay point for delivering electricity generated at a power plant to homes, factories, etc. When an abnormal current flows through the power system due to lightning strikes or the like, this gas-insulated switchgear (GIS) instantaneously interrupts the current and quickly closes to supply power in order to protect facilities such as transformers in the substation.

[0003] The gas-insulated switchgear (GIS) is composed of devices such as a bus (BUS), a gas circuit breaker (GCB), a disconnector (DS), an earthing switch (ES), a current transformer (CT), a lightning arrester (LA), and a cable head (CH). The gas-insulated switchgear has an external configuration in which a plurality of cylindrical pressure vessels are connected. As the gas enclosed in this pressure vessel, for example, sulfur hexafluoride (SF6) is generally used. The gas-insulated switchgear varies in size depending on the rated voltage class. And circuit breakers, earthing switches, etc. are arranged at a corresponding height from the ground surface, and in order to miniaturize, their operating mechanisms are often arranged at high places.

[0004] Sulfur hexafluoride (SF6) is an inert gas with excellent insulation performance and harmlessness, and has excellent current arc extinguishing performance compared to other gases. However, since its global warming potential is as high as 24,000 times that of carbon dioxide (CO2), it is subject to gas leakage management. For this reason, regardless of whether the substation is manned or unmanned, the substation manager conducts patrol inspections to visually check the appearance of the device at a preset cycle and visually check the enclosed gas pressure with a pointer-type pressure gauge in the operating state of the gas-insulated switchgear.

[0005] In addition to the above patrol inspections, for the circuit breakers of gas-insulated switchgear, external general inspections, various measurement tests, and disassembly inspections of the mechanism parts are carried out. For example, Tables 2-3-7 to 10 in Volume 70, Issue 2 of "Enhanced Maintenance of Gas-Insulated Switchgear" of the Electric Power Cooperative Research show the maintenance status of users (domestic power companies). According to this document, it can be seen that the external general inspection of the operating mechanism of the circuit breaker is carried out once every 6 years or once every 12 years, the opening and closing time measurement is carried out once every 6 years or as needed, and the opening and closing stroke measurement is carried out as needed.

[0006] Also, the above document states that the disassembly inspection of the breaking part where the electrodes of the circuit breaker are housed is carried out as needed. Furthermore, the document states that the disassembly inspection of the mechanism part is also often carried out as needed.

[0007] Thus, the frequency of disassembly inspections of the circuit breakers of gas-insulated switchgear is considered to be low compared to other industrial machines that are normally operated. However, the stroke measurement during the opening and closing operation of the circuit breaker is important for judging the operating deterioration state of the circuit breaker.

[0008] As a conventional technique for measuring the opening and closing stroke of a circuit breaker, although the description of the document name is omitted, there is a method of attaching a rotary potentiometer to the rotating shaft of the operating mechanism, using the opening and closing command of the circuit breaker as a trigger for the waveform recorder to record the time history of the swinging angle of the rotating shaft, and converting it to the opening and closing stroke of the circuit breaker.

[0009] Also, as a conventional technique for measuring the opening and closing stroke of gas-insulated switchgear, for example, there is a portable motion measurement system and a motion measurement method described in Patent Document 1. Patent Document 1 discloses a technique that includes a high-speed camera for reading a two-dimensional image, an illumination device, and an image processing display device, attaches markers to the movable part and the fixed part of the opening and closing device, takes pictures of the movable marker and the fixed marker with the high-speed camera when the opening and closing device is in operation, and calculates the opening and closing stroke based on the position change of the movable marker relative to the fixed marker by the image processing display device.

[0010] As another prior art for measuring the opening and closing stroke of a gas circuit breaker, there is a position detection device described in Patent Document 2 and an opening and closing operation characteristic measurement device using the same. Patent Document 2 discloses a technique in which a reflecting plate is fixed to a main shaft (a linearly moving rod) that moves linearly in conjunction with the stroke of a movable electrode during the opening and closing operation of the circuit breaker, and an illumination and an optical system for illuminating the movable range of the reflecting plate are provided. The received optical system receives the light reflected by the reflecting plate and outputs a detected vibration based on the received light amount, which is then converted into an opening and closing stroke.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0012] Regarding the prior art in which the descriptions of the above-mentioned document names are omitted, for newly incorporated products of gas-insulated switchgear, a rotary potentiometer can be attached at the assembly stage of the circuit breaker, and the stroke can be measured without problems. On the other hand, for existing gas-insulated switchgear, there are problems such as the need for modification to fix the rotary potentiometer at the substation site, and the installation work is not easy because the circuit breaker is generally installed at a high place.

[0013] Even in the prior art described in Patent Document 1, if it is a newly incorporated product of gas-insulated switchgear, the stroke can be measured without problems. However, for movable parts inside a pressure vessel such as the movable electrode of the circuit breaker, there is a problem that the disassembly of the breaking part is required to attach a marker at the substation site.

[0014] Similarly, in the prior art described in Patent Document 2, there are also problems that the disassembly of the breaking part of the existing circuit breaker is required as described above, and the work of fixing the optical system into a pressure vessel filled with a specified pressure is required, so the installation work is not easy.

[0015] In the above, the prior art of stroke measurement has been described by taking a circuit breaker as an example. However, the stroke measurement of an earthing switch is the same as that of a circuit breaker.

[0016] The present invention has been made in view of the above points, and an object of the present invention is to provide a method for measuring the moving amount of a movable part of a gas-insulated switchgear that enables stroke measurement during opening and closing operations without stopping a circuit breaker (DS) or an earthing switch (ES).

[0017] Further, the present invention aims to provide an operation deterioration diagnosis method and a maintenance method of a gas-insulated switchgear using the measurement result by the method for measuring the moving amount of a movable part, and in particular, an operation deterioration diagnosis method and a maintenance method of a circuit breaker and an earthing switch of a gas-insulated switchgear.

Means for Solving the Problems

[0018] The method for measuring the moving amount of a movable part of a gas-insulated switchgear of the present invention for solving the above problems is as follows: In a circuit breaker or an earthing switch having a visual inspection window for the movement of a movable part inside a cylindrical container filled with an insulating gas, a photographing unit is installed facing the inspection window. When the movable part moves, a sliding pattern generated on the movable part by rubbing against a current collector provided on a fixed part inside the cylindrical container is photographed by the photographing unit, and the moving amount of the movable part is measured based on the photographed sliding pattern.

[0019] Also, the method for diagnosing operation deterioration of the gas-insulated switchgear of the present invention for solving the above problems is in a circuit breaker or earthing switch provided with a visual inspection window for the movement of a movable part inside a cylindrical container filled with an insulating gas, where a photographing unit is installed facing the inspection window. When the movable part moves, a sliding pattern generated on the movable part by rubbing against a current collector provided on a fixed part inside the cylindrical container is photographed by the photographing unit. Based on the photographed sliding pattern, the movement amount of the movable part is measured, and the opening / closing stroke, which is the measured movement amount, is compared with the opening / closing stroke during normal operation for each inspection of the circuit breaker or earthing switch, and the operation deterioration of the circuit breaker or earthing switch is diagnosed based on the comparison result.

[0020] Also, the maintenance method of the gas-insulated switchgear of the present invention for solving the above problems is in a circuit breaker or earthing switch provided with a visual inspection window for the movement of a movable part inside a cylindrical container filled with an insulating gas, where a photographing unit is installed facing the inspection window. The stationary state of the movable part is photographed by the photographing unit, and the replacement timing of the movable part is determined based on the photographed stationary state of the movable part.

Effect of the Invention

[0021] According to the present invention, without adding a marker or an optical system with the existing device configuration, the stroke, which is the movement amount of the movable part during the opening / closing operation of the circuit breaker or earthing switch, can be measured non-contact. Therefore, the stroke measurement can be easily performed on the circuit breaker or earthing switch regardless of whether it is a newly incorporated product (new product) or an already incorporated product.

[0022] Problems, configurations, and effects other than those described above will be clarified by the description of the mode for carrying out the following invention (hereinafter referred to as the embodiment).

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0024] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same function or configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0025] [Configuration Example of Gas Insulated Switchgear] FIG. 1 is a schematic configuration diagram schematically showing a configuration example of a gas insulated switchgear to which the technology of the present invention is applied. Here, an arrangement example of each component device of the gas insulated switchgear from a transformer in a substation to a transmission line is shown.

[0026] Note that the arrangement example of each component device of the gas insulated switchgear is not limited to the arrangement example shown in FIG. 1, and there are various other arrangement examples.

[0027] In FIG. 1, a circuit coming out of a transformer (not shown) is connected to the transformer-side buses (BUS) 101 and 102 of the gas insulated switchgear 100, and each component device of the gas insulated switchgear 100 is arranged between these buses 101 and 102 and the line side of the transmission line (not shown).

[0028] Specifically, pressure vessels 103 and 104 are arranged above the buses (BUS) 101 and 102, conductors (not shown) are arranged inside thereof, and circuit breakers (DS) 105 and 106 are installed above the pressure vessels 103 and 104. Further, an earthing switch (ES) 107 is provided adjacent to the pressure vessel 104. As the earthing switch 107, an electrically operated earthing switch can be exemplified.

[0029] A current transformer (CT) 108 is arranged adjacent to the pressure vessel 103, and a gas circuit breaker (CB) 109 is arranged adjacent to the current transformer 108. A pressure gauge (P) 110 is connected to the gas circuit breaker (CB) 109. Further, a pressure vessel 111 is arranged adjacent to the gas circuit breaker 109, and devices (not shown) are arranged up to the line side of the transmission line.

[0030] In the gas-insulated switchgear 100 according to this embodiment, the pressure vessel (tank) of the gas circuit breaker 109 extends in the vertical direction, but it may also be configured to extend in a direction orthogonal to the vertical direction (horizontal direction).

[0031] Depending on the rated voltage class of the gas-insulated switchgear 100, the sizes of the respective component devices such as the circuit breakers (DS) 105 and 106, the earthing switch (ES) 107, the current transformer (CT) 108, the gas circuit breaker (CB) 109, and the pressure vessel 111 are different. In the gas-insulated switchgear 100 having the above configuration, the circuit breakers (DS) 105 and 106 and the earthing switch (ES) 107 are generally arranged at positions higher than the head of the operator 200 shown in FIG. 1.

[0032] In the gas-insulated switchgear 100 aiming for miniaturization, since the electric operating mechanisms of the circuit breakers (DS) 105 and 106 and the earthing switch (ES) 107 are arranged in the vicinity of the breaking part and the earthing part, in order to access the operating mechanism for external inspection of the operating mechanism once every six years, a scaffold for high-place work or the like is required.

[0033] Subsequently, the technology of the present invention applied to the gas-insulated switchgear 100 having the above configuration, that is, the technology for measuring the stroke during the opening and closing operation of the circuit breaker and the earthing switch will be described.

[0034] [Example 1] Example 1 is an example of measuring the stroke during the opening and closing operation of a circuit breaker in a gas-insulated switchgear, and a schematic of its configuration is shown in FIG. 2. The stroke during the opening and closing operation of the circuit breaker is the amount of movement during the opening and closing operation of the movable part of the circuit breaker. The movable part of the circuit breaker is the movable-side electrode. In addition to the movable-side electrode, movable parts connected to the movable-side electrode can be used as the movable part.

[0035] FIG. 2 is a schematic configuration diagram schematically showing a configuration example around a circuit breaker to which the movable part movement amount measuring method according to Example 1 of the present invention is applied. The circuit breaker 10 shown in FIG. 2 corresponds to the circuit breakers (DS) 105 and 106 shown in FIG. 1.

[0036] As shown in FIG. 2, the circuit breaker 10 is composed of a cylindrical tank (cylindrical container) 11, an inspection window 12 provided on the outer peripheral portion thereof, and an operation box 13 in which an electric operation mechanism is housed. An insulating gas such as sulfur hexafluoride (SF6) is enclosed inside the cylindrical tank 11. The inspection window 12 is a window through which the movement of the movable part inside the tank (cylindrical container) 11 can be visually observed. Other devices 401, 402 other than the circuit breaker are connected to both ends of the cylindrical tank 11 via flanges 201, 202. In FIG. 2, the broken line X drawn on the side surface of the tank 11 indicates the location where the movable part inside the tank 11 is housed.

[0037] The gas-insulated switchgear according to Embodiment 1 includes a photographing unit 20 arranged to face the inspection window 12, an image processing unit 30 that processes the imaging signal obtained by the photographing unit 20, and a display unit 40 that displays the processing result of the image processing unit 30.

[0038] As the photographing unit 20, for example, a high-speed camera can be exemplified. A high-speed camera is a special video camera that can perform ultra-high-speed shooting of thousands or tens of thousands of frames per second, as opposed to a general video camera that shoots 30 frames per second.

[0039] The high-speed camera is installed at a predetermined distance from the inspection window 12 by fixing means such as a tripod (not shown) and is electrically connected to the image processing unit 30 by wiring 50. The image processing unit 30 includes a camera control unit (not shown) for controlling the high-speed camera. In general high-speed cameras, a separate lighting device is required when photographing the behavior of an object, so a lighting device (not shown) is also installed in this embodiment.

[0040] The image processing unit 30 is configured by, for example, a CPU (Central Processing Unit) or the like, and has a function of measuring the moving amount of the movable part in the tank 11 with a sliding pattern described later taken as a target, which is captured by the imaging unit 20. The display unit 40 displays the processing result in the image processing unit 30, for example, the measurement result of the moving amount of the movable part in the tank 11. Examples of the display unit 40 include a liquid crystal display and an organic EL display.

[0041] FIG. 3 is a diagram including a partial cross-section schematically showing the schematic configuration inside the tank 11 of the circuit breaker 10 in the gas-insulated switchgear 100 according to the first embodiment. In FIG. 3, (a) shows the closed state of the circuit breaker, and (b) shows the open state of the circuit breaker.

[0042] The circuit breaker 10 is composed of an operating mechanism 14, a motion conversion mechanism 15, a movable-side electrode 16, a fixed-side electrode 17, a movable-side electrode support portion 18, and the like. In this circuit breaker 10, the movable-side electrode 16 is the movable part in the tank 11. Examples of the movable part of the circuit breaker 10 can also include movable parts connected to the movable-side electrode 16, for example, the motion conversion mechanism 15. Also, the fixed-side electrode 17 is the fixed part in the tank 11.

[0043] In the circuit breaker 10 having the above configuration, the operating mechanism 14 is housed in the operating box 13 shown in FIG. 2. In the operating mechanism 14, a rotational motion is generated by a motor (not shown). The motion conversion mechanism 15 converts the rotational motion generated in the operating mechanism 14 into a linear motion (reciprocating motion / translational motion) and drives the movable-side electrode 16.

[0044] In the closed state of the circuit breaker 10 shown in Fig. 3(a), the movable-side electrode 16 has a structure in which one end is supported by the movable-side electrode support portion 18. In the fixed-side electrode 17 and the movable-side electrode support portion 18, current collectors 21 and 22 are arranged at the locations (parts) that actually contact the movable-side electrode 16. As these current collectors 21 and 22, as shown in Fig. 4, toroidal coil springs 24a and 24b are often fitted into grooves 23a and 23b formed in the circumferential direction on the inner walls of the fixed-side electrode 17 (movable-side electrode support portion 18). In addition to this, a structure made by connecting thin plates called louvers (not shown in the figure) in a toroidal shape is often used as the current collectors 21 and 22. Fig. 4 is a schematic perspective view including a partial cross-section schematically showing the configuration of the current collectors 21 and 22 provided on the fixed-side electrode 17 (movable-side electrode support portion 18) of the circuit breaker 10.

[0045] In Fig. 3, a configuration in which the current collectors 21 and 22 are provided at one location each on the fixed-side electrode 17 and the movable-side electrode support portion 18 is illustrated, but the configuration is not limited to this. For example, as shown in Fig. 4, a configuration in which a plurality of current collectors 21 and 22 (two locations in the example of Fig. 4) are arranged at one electrode may also be possible.

[0046] Fig. 5 is a view showing the surface state of the movable-side electrode 16 visible from the inspection window 12 in the assembled state of the circuit breaker 10 in the closed state of the circuit breaker 10. When the movable-side electrode 16 is new, the outer peripheral surface of the movable-side electrode 16 is clean and there are no scratches such as sliding marks. Also, although not shown in the figure, grease that can be visually confirmed is uniformly applied to the surface of the movable-side electrode 16.

[0047] In the gas-insulated switchgear, when opening and closing operations are performed several to several tens of times in the opening and closing test of the circuit breaker 10 before operation, the grease applied to the surface of the movable-side electrode 16 is scraped by the current collectors 21 and 22 due to the rubbing of the current collectors 21 and 22 against the movable-side electrode 16, and a linear sliding pattern appears on the surface of the movable-side electrode 16.

[0048] Therefore, in the method for measuring the movable part movement amount according to the first embodiment, the linear pattern that appears on the surface of the movable-side electrode 16 by the current collectors 21 and 22 scraping off the grease applied on the surface of the movable-side electrode 16 is photographed through the inspection window 12 by a photographing unit 20 such as a high-speed camera. Then, the movement amount of the movable-side electrode 16 is measured as the stroke during the opening and closing operation of the circuit breaker 10, using the sliding pattern photographed by the photographing unit 20 as the target for tracking the movement locus. In this way, by measuring the movement amount of the movable-side electrode 16 with the sliding pattern as the target for tracking the movement locus, since the sliding pattern appears as the movable-side electrode 16 moves, the movement amount of the movable-side electrode 16 can be measured more accurately.

[0049] In FIG. 5, points 301 and 302 are shown on the outer periphery of the movable-side electrode 16. The points 301 and 302 are points set on the image processing unit 30 for distance calibration in the photographed image, and are not points actually marked on the outer periphery of the movable-side electrode 16.

[0050] FIGS. 6 and 7 are diagrams (Part 1 and Part 2) showing a situation in which movement locus tracking is performed by photographing the sliding pattern on the surface of the movable electrode during the opening operation of the circuit breaker in the method for measuring the movable part movement amount according to the first embodiment. In FIGS. 6 and 7, in the left diagram, a representative image processed by the image processing unit 30 from a video photographed by the photographing unit 20 such as a high-speed camera and displayed on the display unit 40 is shown, and in the right diagram, a displacement time history waveform (displacement waveform) 300 obtained by tracking the locus of the feature point 304 is shown.

[0051] In FIG. 6, (a) shows the closed state of the circuit breaker 10 (that is, the state before the opening operation starts), and (b) shows an intermediate state 1 of the opening operation of the circuit breaker 10. In the photographing through the inspection window 12 by the photographing unit 20 such as a high-speed camera, the fixed-side electrode 17 cannot be seen because it does not enter the viewing angle of the photographing unit 20, but the fixed-side electrode 17 exists on the right side of the figure, and the tip of the movable-side electrode 16 is inserted. As shown in FIG. 6(a), a plurality of linear sliding patterns 303 appear on the surface of the movable-side electrode 16.

[0052] When there are a plurality of linear patterns appearing on the surface of the movable-side electrode 16, the image processing unit 30 can switch (change) the feature points for tracking the trajectories of the plurality of sliding patterns. As a result, even if the shape of the linear sliding pattern 303 changes due to multiple operations, by changing the feature points for trajectory tracking in the image processing unit 30, there is an advantage that the change in the sliding pattern does not affect the measurement accuracy of the opening and closing stroke.

[0053] Note that when replacing the movable-side electrode 16 or the like, by attaching a marker to the electrode surface, it is possible to measure the opening and closing stroke according to the prior art of Patent Document 1. However, in the case of the prior art of Patent Document 1, the marked surface of the marker may deteriorate due to rubbing of the marker against the current collectors 21 and 22 during multiple operations, which may adversely affect the measurement accuracy of the opening and closing stroke.

[0054] In this embodiment, in FIG. 6(a), the end points of the linear sliding pattern 303 are set as the feature points 304 for tracking the trajectory of the linear sliding pattern. By using the end points of the linear sliding pattern 303 as the feature points 304, the trajectory of the linear sliding pattern can be tracked more reliably. Note that the feature points 304 in the image processing in the image processing unit 30 are not limited to the end points of the linear sliding pattern 303, and may be a single sliding pattern or a plurality of sliding patterns.

[0055] Also, as shown in FIG. 8, after the circuit breaker 10 is in the open state (i.e., after interrupting the current), if the electrode surface of the movable-side electrode 16 is carbonized, a part of the carbonization pattern 305 appearing on the electrode surface may be used as a feature point. Thereby, after the circuit breaker 10 is in the open state, the movement amount of the movable-side electrode 16 can be measured based on the carbonization pattern 305 appearing on the electrode surface of the movable-side electrode 16.

[0056] When the opening operation of the circuit breaker 10 starts, the movable-side electrode 16 moves to the left side of the figure. The intermediate state of the opening operation is shown in FIG. 6B. As the movable-side electrode 16 moves, the position of the feature point 304 also moves in the displacement waveform shown on the right side of FIG. 6(b).

[0057] Furthermore, the situation where the opening operation of the circuit breaker 10 has advanced is shown in FIG. 7. In FIG. 7, (a) shows the intermediate state 2 of the opening operation of the circuit breaker 10, and (b) shows the intermediate state 3 of the opening operation of the circuit breaker 10. In FIG. 7(a), since the feature point 304 set above has moved outside the visual field of the imaging unit 20, the situation where the feature point 304 is changed to the feature point 304' is shown. Due to the change of the feature point (304→304'), the displacement waveform becomes discontinuous, but the distance between the feature points before and after the change can be grasped. Therefore, in the measurement (calculation) process of the moving amount of the movable-side electrode 16 in the image processing unit 30, a process of translating the displacement waveform may be performed.

[0058] Furthermore, when the opening operation of the circuit breaker 10 reaches the final stage, the tip 16a of the movable-side electrode 16 also moves outside the visual field, so the trajectory tracking ends. FIG. 7(b) shows an image in a time zone where the feature point 304' marked on the tip 16a of the movable-side electrode 16 is visible.

[0059] FIG. 9 is an image diagram of the stroke during the opening and closing operations of the circuit breaker 10 measured (calculated) by the movable part movement amount measurement method according to the first embodiment. It is a translation of the discontinuous displacement waveform according to the distance between the above two feature points 304 and 304', and this becomes the opening stroke 306. Note that for the two-dot chain line part that could not be photographed due to the relationship of the imaging angle from the inspection window 12, that is, for the stroke characteristic 307 that cannot be photographed, the calculation of the stroke is impossible. However, when obtaining the average speed as an evaluation index of the opening and closing characteristics, for example, it is sufficient to use the movement amount at 20% to 80% of the entire stroke.

[0060] FIG. 10 is an image diagram showing the normal state, the state with an operation delay, and the state where the operation stops halfway due to an abnormality of the opening stroke of the circuit breaker measured by the movable part movement amount measurement method according to the first embodiment.

[0061] In the image diagram of FIG. 10, waveform 308 is an open-circuit stroke in a normal state and reaches the arc extinction position at a predetermined time t1. In contrast, waveform 309 is an open-circuit stroke in a state where although there is an operation delay, it is possible to move to the arc extinction position, and it reaches the arc extinction position at a time t2 that is later than time t1. In the case of the open-circuit stroke of waveform 309, for example, as shown in FIG. 8, the grease disappears due to carbonization of the surface of the movable-side electrode 16 where the current was interrupted by the circuit breaker 10, and the sliding resistance between the movable-side electrode 16 and the current collectors 21 and 22 provided on the fixed-side electrode 17 and the movable-side electrode support portion 18 may be a factor in the operation delay.

[0062] Waveform 310 is an open-circuit stroke in a situation where the operation delay is further enlarged compared to waveform 309 and the time until reaching the open position is significantly delayed. In the case of the open-circuit stroke of waveform 310, in addition to the increase in the sliding resistance between the movable-side electrode 16 and the current collectors 21 and 22 described above, an increase in the sliding resistance and deformation of parts in the motion conversion mechanism 15 and the operation mechanism 14 shown in FIG. 3 are assumed. In this case, a notification to the effect that an inspection of the entire circuit breaker is necessary is separately transmitted from the image processing unit 30 to the command station of the gas switching device.

[0063] Note that in this embodiment, the abnormality of the open-circuit stroke has been described, but even in the case of a closed-circuit stroke, it is possible to diagnose the operation deterioration in the same manner as the open-circuit stroke.

[0064] In the movable part movement amount measurement method according to the first embodiment, for example, the image diagram of FIG. 10 is displayed on the display unit 40 as the movement amount (stroke) of the movable part of the circuit breaker. Then, the operator can grasp the movement amount (stroke) of the movable part from the image diagram of FIG. 10 displayed on the display unit 40.

[0065] As described above, in the method for measuring the moving amount of the movable part according to the first embodiment, the opening stroke can be calculated by grasping, by the image processing unit 30, the moving amount of the movable-side electrode 16 during the opening operation of the circuit breaker 10, with the endpoints of the linear sliding pattern manifested on the electrode surface as the characteristic points. Therefore, according to the method for measuring the moving amount of the movable part according to the first embodiment, it is not necessary to perform additional work on the circuit breaker body at the substation site, regardless of whether it is a newly incorporated product (new product) or an already incorporated product, and the moving amount (stroke) of the movable part of the circuit breaker 10 can be measured.

[0066] In this embodiment, only the opening operation has been described, but the closing stroke can also be measured (calculated) by the same method for the closing operation of inserting the movable-side electrode 16 into the fixed-side electrode 17.

[0067] [Second Embodiment] The second embodiment is an example of diagnosing the operation deterioration of a gas-insulated switchgear, particularly an example of diagnosing the operation deterioration over time of a circuit breaker in a gas-insulated switchgear. In the second embodiment, the operation deterioration over time of the circuit breaker is diagnosed using the method for measuring the moving amount of the movable part according to the first embodiment.

[0068] In the method for diagnosing the operation deterioration of the gas-insulated switchgear according to the second embodiment, the state of the operation deterioration of the movable part of the circuit breaker 10 is diagnosed from the measurement result of the method for measuring the moving amount of the movable part according to the first embodiment, for example, from the image diagram of FIG. 10 displayed on the display unit 40. For example, an operator can diagnose the state of the operation deterioration of the movable part of the circuit breaker 10 from the image diagram of FIG. 10 displayed on the display unit 40. Specifically, as an example, in the image diagram of FIG. 10 displayed on the display unit 40, in the case of the waveform 309, it is diagnosed that although the operation deterioration has progressed, it is within the allowable range, and in the case of the waveform 310, it is diagnosed that the operation deterioration has progressed and is outside the allowable range.

[0069] Here, it was assumed that the operator diagnoses the degree of operation deterioration by looking at the image diagram of FIG. 10. However, a predetermined threshold value can be set for the time t1 when the opening stroke in the normal state of the waveform 308 reaches the arc extinguishing position, and the state of operation deterioration of the movable part can be automatically diagnosed based on the threshold value. Regarding the threshold value, for example, it may be set in the time zone between the time t1 and the time t2.

[0070] As described above, in the operation deterioration diagnosis method of the gas-insulated switchgear according to the second embodiment, based on the measurement result of the movable part movement amount measurement method according to the first embodiment, that is, based on the image taken from the inspection window 12 of the circuit breaker 10, the stroke waveforms of normal operation and abnormal operation are compared, whereby the state of operation deterioration of the movable part of the circuit breaker 10 can be diagnosed. Therefore, according to the operation deterioration diagnosis method of the gas-insulated switchgear according to the second embodiment, the operation deterioration diagnosis of the circuit breaker 10 of the gas-insulated switchgear can be performed at the substation site without distinguishing between newly incorporated products (new products) and already incorporated products.

[0071] [Embodiment 3] Embodiment 3 is an example in which the stationary state of the movable part is photographed by the photographing unit, and the replacement timing of the movable part is determined based on the photographed state of the movable part. The maintenance method of the gas-insulated switchgear according to Embodiment 3 is a maintenance method for determining the replacement timing of the movable part based on the stationary state of the movable part imaged in the movable part movement amount measurement method according to Embodiment 1.

[0072] In the maintenance method of the gas-insulated switchgear according to Embodiment 3, in the movable part movement amount measurement method according to Embodiment 1, the carbonization pattern 305 (see FIG. 8) that appears when the circuit breaker 10 interrupts the current and the electrode surface of the movable-side electrode 16 is carbonized is photographed by the photographing unit 20 in the stationary state of the movable-side electrode 16 and displayed on, for example, the display unit 40. FIG. 11 shows an example of the display on the display unit 40. Then, the operator looks at the state of the carbonization pattern 305 on the electrode surface of the movable-side electrode 16 in the stationary state of the movable-side electrode 16 displayed on the display unit 40, and determines the replacement timing of the movable-side electrode 16 or the circuit breaker 10 including the movable-side electrode 16.

[0073] As described above, in the maintenance method of the gas-insulated switchgear according to Embodiment 3, the replacement timing of the movable part is determined based on the stationary state of the movable part imaged in the movable part movement amount measurement method according to Embodiment 1. Therefore, according to the maintenance method of the gas-insulated switchgear according to Embodiment 3, it is possible to determine the replacement timing of the circuit breaker 10 or the movable-side electrode 16 of the gas-insulated switchgear at the substation site without distinguishing between newly incorporated products (new products) and already incorporated products.

[0074] [Modification Example] Note that the present invention is not limited to the above-described embodiments, and includes various modification examples. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, or replace other configurations for a part of the configuration of each embodiment.

[0075] For example, in the above-described embodiment, the case where the movement amount of the movable part of the circuit breaker (DS) in the gas-insulated switchgear is measured as the stroke during the opening / closing operation has been described as an example. However, for the earthing switch (ES) having the same configuration as the circuit breaker (DS), that is, a configuration having a movable part including a movable-side electrode and a fixed part including a fixed-side electrode, similar to the circuit breaker (DS), it is possible to measure the movement amount of the movable part, diagnose operation deterioration, and perform maintenance.

[0076] Also, in FIG. 3, although the fixed-side electrode 17 is literally fixed, as a modification example, the fixed-side electrode 17 is not fixed, and a second movable-side electrode having a configuration that can move in the opposite direction relative to the movable-side electrode 16 is provided. It is also possible to adopt a configuration in which the movement amount of the movable-side electrode or the fixed-side electrode is measured using the sliding pattern generated on the second movable-side electrode (fixed-side electrode) as a target for tracking the movement locus. By adopting this configuration, since the relative movement speed between the movable-side electrode and the second movable-side electrode (fixed-side electrode) increases, it becomes possible to perform the movement amount measurement operation more quickly.

Explanation of Reference Numerals

[0077] 10… Circuit breaker, 11… Cylindrical tank (cylindrical container), 12… Inspection window, 13… Operation box, 14… Operating mechanism, 15… Motion conversion mechanism, 16… Moving side electrode, 17… Fixed side electrode, 18… Moving side electrode support part, 20… Photographing part (high-speed camera), 21, 22… Current collectors, 23a, 23b… Grooves, 24a, 24b… Toroidal coil springs, 30… Image processing part, 40… Display part, 100… Gas-insulated switchgear, 101, 102… Transformer side bus (BUS), 103, 104… Pressure vessels, 105, 106… Circuit breakers (DS), 107 Earthing switch (ES), 108… Current transformer (CT), 109… Gas circuit breaker (CB), 110… Pressure vessel, 201, 202… Flanges, 300… Displacement time history waveform obtained by tracking the locus of feature points, 301, 302… Points for performing distance calibration, 303… Linear sliding pattern, 304, 304’… Feature points for tracking the locus of the sliding pattern, 305… Carbonization pattern appearing on the electrode surface, 306… Opening stroke, 307… Stroke characteristics where photographing is impossible, 308… Opening stroke in the normal state, 309… Opening stroke when there is an operation delay, 310… Opening stroke when there is a greater operation delay, 401, 402… Equipment other than the circuit breaker

Claims

1. In a circuit breaker or earthing switch having a visual inspection window for visually observing the movement of a movable part inside a cylindrical container filled with an insulating gas, a photographing unit is installed facing the inspection window, when the movable part moves, a sliding pattern generated on the movable part by rubbing against a current collector provided on a fixed part inside the cylindrical container is photographed by the photographing unit, and the amount of movement of the movable part is measured based on the sliding pattern photographed by the photographing unit A method for measuring the amount of movement of a movable part of a gas-insulated switchgear, characterized by the above.

2. The sliding pattern generated on the movable part is a pattern in which a coating applied to the surface of the movable part is scraped off by rubbing between the movable part and the current collector A method for measuring the amount of movement of a movable part of a gas-insulated switchgear according to claim 1, characterized by the above.

3. In the circuit breaker or the earthing switch, the amount of movement of the movable part is measured based on a carbonized pattern generated on the surface of the movable part after it has entered the open state A method for measuring the amount of movement of a movable part of a gas-insulated switchgear according to claim 1 or 2, characterized by the above.

4. The fixed part includes a fixed-side electrode that can move relative to the movable-side electrode of the movable part in the opposite direction, and the amount of movement of the movable-side electrode or the fixed-side electrode is measured based on a sliding pattern generated on the movable-side electrode or the fixed-side electrode A method for measuring the amount of movement of a movable part of a gas-insulated switchgear according to claim 1, characterized by the above.

5. When the sliding pattern generated on the movable part is linear, the endpoints of the linear sliding pattern are used as feature points for locus tracking A method for measuring the amount of movement of a movable part of a gas-insulated switchgear according to claim 1 or 2, characterized by the above.

6. When there are a plurality of sliding patterns generated on the movable part, the feature points for locus tracking are switched for the plurality of sliding patterns A method for measuring the amount of movement of a movable part of a gas-insulated switchgear according to claim 5, characterized by the above.

7. In a circuit breaker or earthing switch having a visual inspection window for visually observing the movement of a movable part inside a cylindrical container filled with an insulating gas, a photographing unit is installed facing the inspection window, when the movable part moves, a sliding pattern generated on the movable part by rubbing against a current collector provided on a fixed part inside the cylindrical container is photographed by the photographing unit, and the amount of movement of the movable part is measured based on the sliding pattern photographed by the photographing unit, The measured amount of movement, which is the opening and closing stroke, is compared with the opening and closing stroke during normal operation for each inspection of the circuit breaker or the earthing switch, and based on the comparison result, the operation deterioration of the circuit breaker or the earthing switch is diagnosed. A method for diagnosing operation deterioration of a gas-insulated switchgear, characterized by the above.

8. In a circuit breaker or an earthing switch provided with an inspection window through which the movement of a movable part inside a cylindrical container filled with an insulating gas can be visually observed, a photographing unit is installed facing the inspection window, the stationary state of the movable part is photographed by the photographing unit, and based on the stationary state of the movable part photographed by the photographing unit, the replacement timing of the movable part is determined. A maintenance method for a gas-insulated switchgear, characterized by the above.

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