JPH0255965A - Tester for circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for measuring operating characteristics of an operating mechanism of a circuit breaker.

[Prior Art] FIG. 5 is a schematic diagram showing a circuit breaker and a conventional circuit breaker tester attached to the circuit breaker. In the figure, a circuit breaker and a conventional circuit breaker tester will be explained.

The circuit breaker 13 is enclosed in a tank 6 filled with insulating gas. Pneumatic pressure or oil pressure is controlled by driving a solenoid valve (not shown), thereby moving the operating shaft 5 in the axial direction. This operating shaft 5 can be moved in a tank 6 sealed with insulating gas while keeping it airtight. A movable conductor 4 is connected to the end of the operating shaft 5 and is moved in the axial direction by the operation of the operating shaft 5. This movement causes
The tip portion of the movable conductor 4 separates from the contact 3-a, and therefore there is no electrical continuity between the other contact 3-b and the contact 3-a. Bushing conductors 2-a and 2-b, which are fixed to the tank 6 via insulating bushings I-a and 1-b, are connected to the respective contacts 3-a and 3-b.

Therefore, since there is no electrical continuity between the contacts 3-a and 3-b, there is no electrical continuity between the bushing conductors 2-a and 2-b. As described above, this circuit breaker is brought into a disconnected state.

Generally, circuit breakers require periodic inspection, such as once a year. For inspection, a detection unit 8 is installed in an operation mechanism box 7 that covers the operation shaft 5 and its operation mechanism, and measures the movement of the operation shaft 5. FIG. 6 is an enlarged schematic diagram showing a detection section 8 constituting a conventional circuit breaker tester.

The moving voltage detection unit 11 is composed of a current collecting brush fixed on the operating shaft 5, and is in contact with a resistor 9 formed by winding a resistance wire in a spiral shape at a constant pitch. - Power paper antibody 9
The detection unit 8 including the detection unit 8 is fixed to the operation mechanism box 7. Therefore, as the operating shaft 5 moves, the moving voltage detection section 11 slides on the resistor 9 while making contact with it. At this time, since the DC power supply lO is connected to both ends of the resistance wire of the resistor 9, a voltage directly proportional to the moving distance is applied to the moving voltage detecting section 11. This voltage is measured by the recorder 12
and recorded as a time-voltage correlation. In other words, this becomes the time-displacement (traveling distance of the operating axis) curve shown in FIG. Therefore, this curve represents the operating characteristics of the operating mechanism of the circuit breaker.

[Problems to be Solved by the Invention] In the conventional example shown in FIG. The problem is that the condition of the contacting surfaces not only causes fatigue due to the number of operations but also changes over time. For this reason, it has been impossible to leave the conventional circuit breaker tester attached to the operating mechanism and use it several times a year to measure the operating characteristics of the operating mechanism.

Therefore, during actual measurement, it was necessary to attach the detection section 8 and the moving voltage detection section U to the operating mechanism, and to remove them after measurement. When installing or removing the circuit breaker, it is necessary to turn off the power to the circuit breaker system to maintain a safe condition so that the circuit breaker cannot be operated by accident or other human effort. However, such power outages pose problems in terms of system operation.

Means for Solving the Problem] In the circuit breaker tester of the first invention, an optical marker is attached to the operating shaft that moves when the circuit breaker is operated, and a video camera and a strobe light source are further provided to photograph the marker. Then, convert the video camera's image output to analog
The image data is digitized by a digital converter (hereinafter referred to as an A/D converter), and the digitized image data is recorded on a digital video recorder. A digital video recorder is connected to a memory and a central processing unit (hereinafter referred to as CPU). This CPU sequentially performs calculations between a plurality of digitized images to calculate the moving distance (hereinafter referred to as displacement) of the marker. The results are stored in memory and the display accordingly displays the displacement of the marker for each time.

Further, in the second invention, in addition to the above configuration,
Regarding marker detection in digitized images, the above function is achieved by extracting the feature points of the marker shape, calculating the marker area, identifying the marker, and calculating the marker displacement accordingly. It is.

[Function] In the present invention, the movement of the marker on the operation axis is captured quantitatively as a displacement with respect to time by being photographed with a video camera, A/D converted, and then subjected to calculation and storage processing by the CPU. , this correlation is visually displayed on a display device in the form of a curve graph or the like.

[Example] An example of the circuit breaker tester according to the present invention will be described with reference to FIGS. 1, 2, 3, and 4.

FIG. 1 is a sectional view showing how an embodiment of the circuit breaker tester according to the present invention is installed.

In FIG. 1, the circuit breaker 13 is the same as that in FIG. 5, and the circuit breaker 13 is enclosed in a tank 6 filled with insulating gas. An insulating bushing 1-a is attached to the tank 6.

Bushing conductors 2-a and 2-b are fixed via 1-b, and contacts 3-a and 3-b are connected to the bushing conductors 2-a and 2-b, respectively. The movable conductor 4 has its tip inserted into the contactor 3-a, and its other end connected to the operating shaft 5. The operation axis 5 is
When the circuit breaker is operated, it moves in the axial direction by air or hydraulic pressure. This movement causes the movable conductor 4 to subsequently move,
The tip portion of the movable conductor 4 separates from the contact 3-a, and therefore the electrical continuity between the other contact 3-b and the contact 3-a is lost.

As described above, this circuit breaker is brought into a disconnected state.

On this operating shaft 5, a marker 14 of a triangular shape, for example, which is made of a mirror surface or a fluorescent tape material and has a geometric shape that is easy to identify in the digitized image, is pasted on the operating shaft 5, and has a different amount of light reflected from the background. ing.

Marker 1 is placed opposite the marker 14 installation part of the operation shaft 5.
A video camera 15 is installed so as to be able to photograph the movement of 4 through the opening of the operating mechanism box 7.

A strobe light 17 is also attached so that the marker 14 can be illuminated at regular intervals to photograph the moving state. A video camera 15 and a strobe light 17 are attached to a circuit breaker tester body 23.

FIG. 2 shows the electrical configuration of the circuit breaker tester 23. The circuit breaker tester 23 is controlled by a central processing unit (hereinafter referred to as CPU) 16. The CPU 16 includes a video camera 15, a strobe light 17, and an A/D converter! 8,
Digital video recorder 19 and display device 2
0 is connected via an input/output interface 21. The CPU 16 also calculates the displacement of the marker 14 by image calculation. Therefore, the memory 22 that stores the processing program and various data is the CPU.
16. The CPt 116 transmits the image signal of the video camera 15 to the A/D converter 18, and causes the digital video recorder 19 to record the digitized image data one image at a time.

be. When attempting to operate the operation shaft 5 of the circuit breaker (step 41), the video camera 15 starts recording and the flashing operation of the strobe 17 also starts (step 42).
~43). The flashing of the strobe 17 causes the video camera 1 to
The images taken by No. 5 become individual images corresponding to the time when the strobe light 17 was turned on.

The first image, the second image, the third image, and so on are recorded as the n-th image. When we perform subtraction processing between the data of two of these digitized image data, the two
The distance (displacement) of the marker moved during the time interval during which the two images were taken is calculated. Therefore, for example, such subtraction processing is performed for every two screens that are adjacent to each other in terms of time, and the displacement is stored in the memory 22 each time (steps 44 and 45). The process is repeated until the movement of the marker is completed (step 46). When the movement of the marker is completed, the time corresponding to the memorized marker displacement is displayed on the display device 2o (step 47). 4 shows another embodiment. In the example shown in FIG. 4, the operating shaft 5 is moved by pneumatic drive of the operating section 24.

A control current transmitter 26 is provided in the solenoid valve 25 that controls this air pressure, and it becomes possible to start measurement based on a signal from this transmitter. At this time, it is also possible to digitize the signal from the present transmitter and process it in the CPU 16 to display the current value over time together with the displacement data on the display device 2o.

As a result, a chart of the overall characteristics of the operating mechanism is obtained, including the delay time of the operation due to the air pressure of the operating mechanism from the time when the signal to start the operation is issued.

Furthermore, the display device 20 of the above embodiment is actually a CRT.
, printer, XY plotter, etc. are used.

In addition, in the flowchart shown in FIG. 6 showing the displacement calculation of the marker 14 in the above embodiment, between step 44 and the steering knob 45, calculation is performed to compare the area of the marker with the fact that the marker has three vertices. A step of identifying markers in the image data can be added. This double-check marker discrimination step makes it possible to perform highly reliable marker displacement calculations while preventing mistakes with dirt or the like.

Further, although the present invention has been described in the case of a circuit breaker tester, it can also be applied to a disconnector or a grounding switch for a pond, and the same effects as those of the above-mentioned embodiments can be obtained.

[Effects of the Invention] As described above, according to the first invention, since the marker attached to the operating shaft is measured from the outside of the operating mechanism box in a non-contact manner, a tester such as a video camera is used during measurement. It is sufficient to install the device outside the circuit breaker at a specified distance from the operating shaft, so there is no need to shut off the system when installing or removing the device, and the mechanical Since there is no target movement, highly reliable measurement is possible even after many movements.

Furthermore, in the second invention, since marker discrimination is performed at least by extracting feature points of the marker shape or by calculating the marker area, there is no possibility of misidentifying the marker due to dirt or scratches on the operating axis, and a more accurate marker can be obtained. It is possible to measure the displacement of

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a block diagram showing the electrical configuration of the circuit breaker tester, and Fig. 3 is a CP
Flowchart showing the calculation processing order of displacement and current value by U, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. 5 is a sectional view showing the installation situation of a circuit breaker and a conventional example of the present invention. FIG. 6 is an enlarged schematic configuration diagram of a detection section of a conventional example of the present invention,
FIG. 7 is a graph of time versus displacement (distance traveled by the operating axis) obtained by the conventional example of the present invention. In the figure, 13 is the circuit breaker, 23 is the circuit breaker tester body, 14
1 is a marker, 17 is a strobe light, 15 is a video camera, 1B is an analog/digital converter, 19 is a digital video recorder, 16 is a central processing unit, 22 is a memory, and 20 is a display device.

Claims (2)

[Claims] (1) An operating shaft of a circuit breaker operating mechanism that has a marker on its outer surface and moves when the circuit breaker is operated, a strobe light that illuminates the marker, and a marker that is illuminated by the strobe light when the circuit breaker is operated. a video camera that photographs the movement of the camera and outputs image output; an analog-to-digital converter that converts multiple image outputs sequentially output from the video camera into analog and digital; and multiple converters from the analog-to-digital converter. a digital video recorder for recording the digitized image output; a means for sequentially calculating the difference between the plurality of digitized image data; and storing data on the position of the marker over time obtained by the calculation. A circuit breaker tester comprising: a memory; means for outputting an output indicating the relationship between the passage of time and the position of the marker based on the data stored in the memory; and a display device for displaying the displacement output in a graph. (2) The means for sequentially computing the difference between the digitized image data includes at least a computing unit that discriminates the marker by either extracting feature points of the marker shape or calculating the area of the marker. (1) The circuit breaker tester described in (1).