JPH09128035A - Abnormality monitoring device of equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically, surely and early discover the occurrence of an equipment abnormality and to prevent the extension of the abnormal situation by a proper initial correspondence, by comparing an integrated value and the abnormality decision value of the equipment which is preliminarily set and deciding the presence or absence of the abnormality. SOLUTION: The video signals S2 of the plural portions of the equipment imaged by a camera 1 are reproduced and displayed on a video display device 3, successively being switched. These video signals S2 are inputted in a video processing means 8 and whether a change exists between two continuos images or not is detected. By the comparison of the integrated value from the video processing means 8 and the abnormality decision value of the equipment which is preliminarily set to a computer 7 for video processing, the presence or absence of an equipment abnormality is decided. Therefore, even if a worker does not normally visualize the video reproduced and displayed on the video display device 3, the presence or absence of the equipment abnormality is monitored with high frequency by utilizing the video signals S2 imaged by the camera 1 and the occurrence of the abnormality can be automatically, surely and quickly discovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equipment abnormality monitoring device, and more specifically, it constantly monitors important equipment such as a burner zone of a thermal power plant and a fuel tank yard, and leaks, smokes, and fires to the important equipment. When an abnormality such as
The present invention relates to an abnormality monitoring device for equipment that is installed and used to detect it early and prevent the expansion of abnormal situations.

[0002]

2. Description of the Related Art Taking a burner zone of a thermal power plant as an example of equipment abnormality monitoring means, conventionally, a plurality of video signals picked up by ITV surveillance cameras installed at a plurality of places in the burner zone are sequentially switched. While
The video signal is replayed and displayed on a video display device such as a CRT installed in a central control room, and the replayed video is visually checked to see if an abnormality has occurred or by a patrol by a worker. Means were generally adopted. Further, as a means of complementing the visual monitoring and patrol monitoring of images as described above, means for using a fire detector, a combustible gas detector, or the like together is also known.

[0003]

However, in the case of visual monitoring and patrol monitoring of images, it is not only necessary for a worker to have a constant monitoring system, but also abnormalities due to image oversight or the occurrence of abnormalities immediately after patrol. It is unavoidable that mistakes and delays will occur in discovering situations. As a result, there has been a problem in that an abnormal situation cannot be swiftly and appropriately dealt with in the initial stage, leading to the expansion of the abnormal situation.
Also, when using fire detectors and combustible gas detectors together, not only the equipment cost rises, but also frequent maintenance is required to maintain the operational reliability of those detectors and detectors. However, it also has the drawback of requiring more full-time staff.

Therefore, the present invention has been made in view of the above situation, and the invention according to claim 1 enables a video signal picked up by a surveillance camera to be effective even if a constant monitoring system by a worker is not adopted. It is an object of the present invention to provide an equipment abnormality monitoring device that can be used to automatically and surely detect the occurrence of equipment abnormality and to prevent the expansion of an abnormal situation by appropriate initial response.

In addition to the object of the invention according to claim 1, the inventions according to claim 2 and claim 3 eliminate the erroneous determination due to a transient disturbance or background change, and improve the reliability of abnormality monitoring. The purpose is to be able to further increase.

In addition to the object of the invention described in claim 1, 2 or 3, it is an object of the invention described in claim 4 to reduce the facility cost of the entire apparatus.

Further, in addition to the object of the invention described in claims 1 to 4, it is an object of the invention described in claim 5 to make it possible to arbitrarily verify the situation when an abnormality occurs.

[0008]

In order to achieve the above-mentioned object, an equipment abnormality monitoring apparatus according to the invention of claim 1 of the present invention comprises a camera for photographing a plurality of locations of the equipment, and An ITV control unit for sequentially switching control of a plurality of image signals to be picked up, a video display device for reproducing and displaying a video signal output by being controlled by the ITV control unit, and an image output from the ITV control unit. A signal is input to detect whether or not there is a change between two consecutive images, and when the detection result is a change, the subsequent image is input to calculate the absolute value of the change amount and A video processing means for integrating the values, a video processing computer for controlling the video processing means, comparing the integrated value with a preset abnormality judgment value of the equipment to judge the presence or absence of abnormality, and Video It is characterized by comprising an alarm display device for displaying an abnormal alarm that is transmitted when the result of judgment by the physical computer is abnormal, and video signals of a plurality of points of equipment imaged by a camera. While being sequentially switched, the video signal is reproduced and displayed on the video display device, and at the same time, it is detected whether or not there is a change between the continuous two images by inputting the above-mentioned video signal to the video processing means. If there is, the subsequent image is captured, the absolute value of the change amount is calculated, and the absolute value is integrated. Then, the presence or absence of equipment abnormality is determined by comparing the integrated value from the image processing means with the equipment abnormality determination value preset in the image processing computer, and when there is abnormality, the abnormality alarm is displayed on the alarm display device. Will be displayed. In this way, even if the operator does not constantly watch the video reproduced and displayed on the video display device, the video signal captured by the camera is used to frequently monitor the presence or absence of equipment abnormality to detect the occurrence of abnormality. It is possible to discover automatically and surely quickly.

Here, when there is a change in the detection result of the video processing means, by providing means for confirming the continuity thereof as described in claim 2, the change between two consecutive images can be changed, for example. In the case of a transient disturbance such as burner point / fire extinguishing in the burner zone of a thermal power plant or shaking of the device name display tag, the error caused by the transient disturbance is not transferred to the abnormality determination process described above. It is possible to eliminate the judgment, and when the detection result of the image processing means is unchanged, the continuous 2 is set as described in claim 3.
By providing a means for automatically setting the equipment abnormality judgment value based on the background of the input images for detecting the change between images, the illuminance and sensitivity of the imaging location of the camera and the background change from moment to moment. Even under such conditions, it is possible to automatically set the abnormality judgment value of the equipment to an appropriate value automatically in response to the change, and it is possible to accurately judge the equipment abnormality irrespective of changes in the background and the like. it can.

A display device for displaying an abnormality alarm transmitted from the video processing computer, according to claim 4.
As described above, by configuring the image display device for reproducing and displaying the image signal picked up by the camera as well, it is not necessary to additionally install a display device dedicated to the abnormality alarm, and the equipment of the entire device can be installed. The cost can be reduced, and the status of the equipment and the alarm display for the equipment abnormality can be centrally displayed on a single display device.

Further, a fifth aspect of the present invention is the facility abnormality monitoring apparatus according to the first to fourth aspects of the invention, in which an abnormal image storage means for storing an image when there is an abnormality is added. In this case, the image at the time of the occurrence of the abnormality can be taken out at a later date, and can be effectively utilized for verification of the situation at the time of the occurrence of the abnormality and investigation of the cause.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram when applied to a burner zone abnormality monitoring device of a thermal power plant as an equipment abnormality monitoring device according to the present invention. In FIG. 1, 1 ... Are installed at a plurality of places in the burner zone. A visible light camera, 2 is an ITV control unit, 3 is a CRT as an image display device installed in the central control room 4 at a position apart from the burner zone, and a plurality of image signals imaged by the cameras 1 ... Is sequentially switched at 20-30 second intervals by a control signal from the ITV control section 2, and the video signal is reproduced and displayed on the CRT 3. It is a thing.

Reference numeral 5 is a switcher, and 6 is a time base collector. The video signal output from the ITV control unit 2 is a video switching signal S from a video processing computer which will be described later.
Based on 1, the switcher 5 sequentially switches and the time base collector 6 synchronizes with the video signal output to the CRT 3. Reference numeral 7 denotes a video processing computer, which has a video processing means 8, an abnormal image storage means 9 and an input / output means 10, each built into a board,
Control of each of these means 8, 9 and 10 and abnormality determination described later are performed. Of these, the video processing means 8 is
A function of binarizing continuous two images (still images) of the video signal S2 output from the V control unit 2 and synchronized and input, and detecting whether there is a change between the two images, the detection result thereof When there is a change, means for checking the continuity by repeating the same detection operation a plurality of times within a predetermined time. When the continuity is confirmed, the subsequent image is input and the absolute value of the change amount is calculated. Means, means for filtering the absolute value and integrating it, and when the above detection result does not change, the burner zone abnormality described later based on the background of the image (illuminance, sensitivity, etc.) input for the detection It has means for automatically switching and setting the judgment threshold value.

Further, the video processing computer 7 is
The presence / absence and the type of abnormality are determined by comparing the integrated value in the image processing means 8 with the type-specific abnormality determination threshold value preset in the computer 7. It should be noted that, in the case of smoke, leakage, and fire among the abnormal phenomena peculiar to the burner zone, when the horizontal axis represents the brightness and the vertical axis represents the number of pixels, as shown in FIG. The different patterns are extracted through a smoke, leak filter, or fire filter, and the extracted patterns are integrated over a predetermined number of times to be compared with the abnormality determination threshold value for each type preset in the computer 7. The integrated value is decided.

Further, the image storage means 9 stores an image when the judgment result in the video processing computer 7 is abnormal, and the stored abnormal image can be arbitrarily retrieved later. Furthermore, the abnormality alarm S3 issued when the result of determination by the image processing computer 7 is abnormal is sent to the IT via the input / output means 10.
The CRT 3 is configured to be fed back to the V control unit 2 and displayed on the CRT 3 installed in the central control room 4 through, for example, characters. Therefore, the CRT 3 also serves as an abnormality alarm display means. A CRT or the like different from the CRT 3 may be provided as the display means for the abnormality alarm S3.

Next, an abnormality detection processing operation by the abnormality monitoring device in the burner zone of the thermal power plant constructed as described above will be briefly described with reference to the flowchart of FIG. A plurality of video signals picked up by a plurality of cameras 1 ...
The video signal is reproduced and displayed on the CRT 3 in the main control room 4 while being sequentially switched at intervals of ˜30 seconds, and at the same time, the video signal output from the ITV control unit 2 is built in the video processing computer 7. The switches are sequentially switched by the switcher 5 on the basis of the video switching signal S1 from the input / output means 10, and the CR is controlled by the time base collector 6.
It is input to the image processing means 8 of the image processing computer 7 in synchronism with the image signal output to T3, where the continuously input initial image and current image are binarized and between the two consecutive images. Is detected (steps S11 to S14).

Then, when there is no change between the two consecutive images, the initial image is updated until the predetermined time t1 elapses, and after the predetermined time t1 elapses, the initial image is input for the detection. By automatically switching and setting the abnormality determination threshold based on the background of the image, the illuminance and sensitivity of the imaged location by the camera 1 ... The abnormality determination threshold value is always properly and automatically set, and the video switching signal S1 is transmitted to the switcher 5 to switch the cameras 1 ... And the next detection operation is performed (steps S15 to S18). On the other hand, when there is a change between the two consecutive images, the same detection operation is repeated a plurality of times within the predetermined time t1 and there is no similar change, for example, the burner is turned on or extinguished, or the device name display tag is shaken. In the case of a transient disturbance, the initial image is updated (steps S19 to S20).

When a similar change continues for a plurality of times between the two consecutive images, the current image is taken into the video processing means 8 and the absolute value of the change amount is calculated (step S22). Subsequently, the absolute value of the calculated change amount is extracted by applying smoke, a leak filter and a fire filter,
The computer 7 compares the integrated value obtained by integrating it over a predetermined number of times N with an abnormality determination threshold value preset in the image processing computer 7 to determine the type and presence / absence of the abnormality, and determine whether there is an abnormality. In the case of, the abnormal alarm S3 is fed back to the ITV control unit 2 via the input / output means 10 and the CR installed in the central control room 4
For example, while being displayed on T3 via characters,
The abnormal image is recorded and saved in the image saving means 9 (steps S23A, 23B to S28), and when there is no abnormality (normal), it is judged that a person has passed and the cameras 1 ... Are switched to input the initial image (step S11). ) Return to.

As described above, the video signal S1 picked up by the cameras 1 ... and sequentially displayed on the CRT 3 in the main control room 4 is taken in, the change between two consecutive images is detected, and the continuity of the change is confirmed. By performing filtering processing and integration processing to monitor the type of abnormality such as smoke, leakage or fire in the burner zone and the presence / absence of abnormality at a high frequency, the worker can display the image displayed on the CRT 3 Even if you don't always see it
In addition, it is possible to discover it surely and quickly.

In the above-described embodiment, the abnormality monitoring target is applied to the burner zone of the thermal power plant. However, in addition to this, a monitoring system such as the fuel tank yard of the thermal power plant has been conventionally used only with the ITV. It can also be applied to the monitoring of important equipment in various industries where is adopted and for disaster prevention.

[0021]

As described above, according to the first aspect of the present invention, it is possible to monitor the presence or absence of equipment abnormality at a high frequency by effectively utilizing the video signal captured by the surveillance camera. Therefore, in terms of equipment, even if the existing ITV monitoring device has an economical structure in which a video processing computer having a built-in video processing means is added, it does not require a constant monitoring system by workers. It is possible to automatically and surely detect an equipment abnormality and prevent an abnormal situation from expanding by an appropriate initial response.

According to the invention described in claims 2 and 3, in addition to the effect of the invention described in claim 1, erroneous determination due to transient disturbance or background change is eliminated, This has an effect that the predetermined abnormality monitoring can be made highly reliable.

According to the invention of claim 4, in addition to the effect of the invention of claim 1, 2, or 3,
The dual use of the display device brings about an effect that the facility cost of the entire device can be further reduced.

Further, according to the invention described in claim 5,
In addition to the effects of the invention described in claims 1 to 4, there is an effect that it is possible to arbitrarily verify the situation and cause at the time of occurrence of an abnormality at a later date and contribute to the improvement of the safety of the equipment.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram when applied to an abnormality monitoring of a burner zone of a thermal power plant as an equipment abnormality monitoring device according to the present invention.

FIG. 2 is a flowchart showing an abnormality detection processing operation by the above abnormality monitoring device.

FIG. 3 is a graph showing a pattern example in the case of smoke or leakage and in the case of fire among abnormal phenomena peculiar to the burner zone.

[Explanation of symbols]

 1 Visible Light Camera 2 ITV Control Section 3 CRT (Also serves as an abnormal alarm display means) 7 Computer for video processing 8 Video processing means 9 Abnormal image storage means 10 Input / output means

Front Page Continuation (72) Inventor Shigeki Mitani 3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Koji Fukuda 3-14-40 Senrioka, Settsu City, Osaka Toko Seiki Co., Ltd. In-house (72) Inventor Seizaburo Murayama 3-14-40 Senrioka, Settsu-shi, Osaka Toko Seiki Co., Ltd. (72) Inventor Hideki Umekawa 3-14-40 Senri-oka, Settsu, Osaka Toko Seiki Co., Ltd. ( 72) Inventor Takushi Nakano 3-14-40 Senrioka, Settsu-shi, Osaka Toko Seiki Co., Ltd.

Claims (5)

[Claims] 1. A camera for imaging a plurality of locations of equipment, an ITV control unit for sequentially switching control of a plurality of video signals captured by the camera, and a video signal output under the switching control by the ITV control unit. A video display device for reproduction and display and a video signal output from the ITV control unit are input to detect whether there is a change between two consecutive images, and when the detection result is changed, the subsequent Image processing means for inputting an image to calculate the absolute value of the change amount and integrating the absolute value, and the image processing means for controlling the integrated value and the preset abnormality judgment value of the equipment. And an alarm display device for displaying an abnormal alarm that is transmitted when the result of determination by the image processing computer is abnormal. Abnormality monitoring apparatus amenities characterized Rukoto. 2. The equipment abnormality monitoring device according to claim 1, further comprising means for confirming continuity of the detection result of the image processing means when there is a change. 3. A means for automatically setting an abnormality determination value of equipment based on the background of an image input for the detection when the detection result of the video processing means is unchanged. The equipment abnormality monitoring device according to item 1 or 2. 4. A display device for displaying an abnormality alarm transmitted from the video processing computer is also used as a video display device for reproducing and displaying the video signal.
The equipment abnormality monitoring device according to any one of 2 and 3. 5. The equipment abnormality according to any one of claims 1, 2, 3 and 4, further comprising: abnormality image storage means for storing an image when a determination result by the video processing computer indicates abnormality. Monitoring equipment.