JPH02173897A - Abnormality monitoring system for unmanned substation or the like - Google Patents

Abstract

PURPOSE:To immediately confirm status in the neighborhood of a monitor point at the monitor point by specifying a point where abnormality occurs by computing the output signal of a microphone when the abnormality occurs, and automatically displaying a part where the abnormality occurs directing a television camera toward the point where the abnormality occurs. CONSTITUTION:Non-directional microphones 2 to detect an abnormal tone are arranged at three or more points inside a large outdoor site 1 like an unmanned transformer station, etc., directing toward the inside, respectively. The output signal of each microphone 2 is inputted to a computer 3, and a system is started up by detecting a large tone occurring as in a flashover accident, etc., as the abnormal tone when it occurs, and the specification of the point where the abnormality occurs is performed based on time difference in each microphone 2 when receiving the abnormal tone. And computed position information with respect to the point where the abnormality occurs is sent to a controller 4, and the television camera 5 in the site 1 is automatically scanned in its direction. In such a way, the status of the spot can immediately be recognized at the monitor point.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention automatically detects when an accident such as a breakdown or fire occurs in a large unmanned site such as an unmanned substation or tank yard. The present invention relates to an abnormality monitoring system for unmanned substations, etc., which enables prompt and appropriate countermeasures to be taken at a monitoring station.

(Conventional technology) When an abnormality such as a breakdown or fire occurs at an unmanned substation or unmanned power plant, workers have traditionally rushed to the site from a monitoring station where they learned of the abnormality through abnormal current sensors, fire alarms, etc. After confirming the location of the abnormality, countermeasures were taken. As a result, it took time to restore power and caused social unrest, such as prolonged power outages. In addition, many unmanned substations are equipped with ITV (industrial television) cameras, but when an abnormality occurs, it takes a lot of time to scan the TV camera at the monitoring station and find the location of the abnormality. There is a risk of losing the timing to take measures, and
In order to always display the entire venue on a monitor screen, an extremely large number of television cameras had to be installed, and the same number of monitor screens were also required, which led to the problem of high equipment costs.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and when an abnormality occurs, it is possible to automatically display the location of the abnormality on the monitor screen of the monitoring station. It was developed for the purpose of an abnormality monitoring system for unmanned substations, etc., which enables prompt and appropriate countermeasures and keeps equipment costs relatively low.

(Means for Solving the Problems) The present invention, which was completed in order to solve the above problems, installs omnidirectional microphones for detecting abnormal sounds at three or more points inside an unmanned substation, etc. When an abnormal sound is detected, the output signal of each microphone is calculated to identify the point of occurrence, and the TV camera is automatically pointed at the point where the abnormal sound is generated and the location is displayed on the monitor screen at the monitoring station. It is characterized by depicting the situation.

(Examples) The present invention will be described in more detail below with reference to illustrated examples.

In the figure, (1) indicates an unmanned site with a vast outdoor area, such as an unmanned substation, etc.. Microphones (2) are each installed facing inward. The output signal of each microphone (2) is manually input to the computer (3), and although it does not operate at the noise level normally generated by wind, etc., it does not operate at the noise level generated by wind etc.
When a loud sound such as an explosion occurs, it is interpreted as an abnormal sound, the system is activated, and each microphone (2
) identifies the location of the abnormal sound based on the time difference when the abnormal sound is received.

That is, as shown in Figure 2, the distance from the abnormal sound generation point to each microphone (2), and the distance between each microphone (2)
Since the time for abnormal sound to reach is proportional to It should be on a perpendicular line drawn from the dividing point. Also, the microphones B and C and the
, A can be said to be similar, so it can be seen that an abnormality has occurred near the intersection of these three perpendicular lines.

In the present invention, the positional information regarding the abnormal sound generation point calculated in this way is sent to the controller (4),
An ITV television camera (5) placed at an appropriate position within the premises (1) is automatically scanned in that direction. The image is then displayed on a monitor screen inside the observation post.
This means that you can immediately know the situation at the observation post. In addition, in consideration of the case where an abnormality occurs at night, it is preferable to attach an illumination light (6) to the television camera (5) so that the illumination is turned on at the same time as an abnormality is detected. Further, it is assumed that various output devices such as a printer (7), a CRT (8), and a storage device (9) are connected to the computer (3).

As mentioned above, the system of the present invention is designed to automatically start up when a sound exceeds a certain level, but the system is activated in addition to fire alarms, landslide sensors, intruder sensors, and equipment monitoring panels. This can also be done using signals from devices that detect abnormalities such as. Furthermore,
The system can also be started up using equipment that determines the location of a fault, such as a fault section detector that automatically detects abnormal locations in a current circuit. However, in this case, since the failure point is known, the TV camera (5)
All you have to do is scan it.

The number of microphones (2) used in the present invention is three or more, but as the number increases, calculations require more time, so three is basically sufficient. However, it is preferable to additionally install a microphone in a location where it is difficult for sound to reach, in order to improve the detection accuracy. In addition, in order to detect three-dimensionally, microphones are installed near the ground at each of the three points or one of them and at a high place, and by detecting the time difference, it is possible to detect the failure point three-dimensionally. Become.

In the present invention, if an omnidirectional microphone is used, abnormalities occurring around the substation can be detected.
It can be used to take preventive measures. Furthermore, if an optical microphone is used, stable detection can be expected over a long period of time without being affected by electromagnetic induction or electrostatic induction. moreover,
A method for detecting the location of a sound source using a microphone will be explained in detail. There is a known method of measuring the arrival time from the sound source to each microphone and estimating the point of occurrence from that, but this method requires other sensors to accurately detect the moment the sound is generated. The present invention is a method that can be used without detecting the moment when this occurs. Figure 3 shows one of the sound pressure level waveforms captured by each microphone.
In the example, the waveform of each microphone is constantly monitored, and the waveform of each microphone is constantly monitored to detect sounds above a certain level. At the time of pressure, the waveform of each microphone is memorized for a certain period of time,
The generation of the sound source can be determined by determining the peak, or by holding the peak value within a certain time when the sound pressure is above a certain level, and finding the time difference between points a, b, and c when each microphone reaches its peak. Points can be detected.

In addition to this, it is also possible to perform frequency analysis of the sound, extract a specific frequency, detect the same frequency with other microphones, and detect the point of occurrence from the time difference using the same method as above.

In actual sites, errors tend to occur due to reflections from buildings and tanks, but it is also possible to use fuzzy theory to process ambiguous data and perform accurate detection. It is also possible to estimate the type of accident by storing sounds from various accidents and comparing them with sounds from abnormal occurrences. In this case, the storage device connected to the CPU (3) Various sounds are memorized by performing ferry conversion, etc.

As described above, the present invention is suitable for monitoring abnormalities inside unmanned substations, unmanned power plants, chemical plants, tank yards, etc., but it can also monitor for fires, intrusions, terrorist activities, etc. It can also be used to take preventive measures against. It goes without saying that it can also be used to monitor people's equipment.

(Effects of the Invention) As explained above, the present invention calculates the output signal of the microphone when an abnormality occurs, pinpoints the point where the abnormal sound occurs, automatically directs the television camera to the point where the abnormal sound occurs, and immediately sends it to the monitoring station. Since the location where the abnormality occurs can be automatically displayed on the monitor screen, the situation in the vicinity can be immediately known at the monitoring station, and appropriate countermeasures can be taken quickly. In addition, with the present invention, there is no need to manually operate the television camera, so you can concentrate on taking countermeasures. Since there is no need to keep it in place, equipment costs can be reduced.

Therefore, the present invention greatly contributes to the development of industry as an abnormality monitoring system for unmanned substations, etc., which eliminates the problems of the conventional system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the system of the present invention, Fig. 2 is a principle diagram explaining the principle of identifying the point where an abnormal sound occurs, and Fig. 3 is a block diagram showing the system of the present invention.
The figure is a graph showing changes in the sound pressure level detected by each microphone when abnormal sound occurs. (2): Microphone, (4): Television camera.

Claims (1)

[Claims] Omnidirectional microphones for detecting abnormal sounds are installed at three or more points inside an unmanned substation, etc., and when abnormal sounds are detected, the output signals of each microphone are calculated to locate the point of occurrence. An abnormality monitoring system for unmanned substations, etc., which is characterized by identifying the abnormal sound, and automatically pointing a television camera at the point where the abnormal sound is generated, and displaying the situation on the monitor screen of the monitoring station.