JPH06253421A - Monitoring system for power transmission and distribution equipment - Google Patents

Abstract

PURPOSE:To provided a power transmission and distribution facility monitoring system which utilizes a pyroelectric infrared-ray sensor having strong points such as low cost, small size, high sensitivity, etc. CONSTITUTION:This is a power transmission and distribution facility monitoring system equipped with a pyroelectric infrared-ray detector, which is provided in the shape of a plurality of arrays, being directed toward power transmission and distribution facility 220, a chopping means, which intermittently interrupts the infrared rays incident on the detector, and a signal processing means 250, which recognizes the abnormal condition being obtained from the temperature of the power transmission and distribution facilities 220, based on the detection signal from the detector 210.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission and distribution facility monitoring system using a pyroelectric infrared sensor.

[0002]

2. Description of the Related Art Conventionally, there are two types of devices for measuring the temperature distribution in space using infrared rays. One of them is a method of obtaining a temperature distribution using a two-dimensional quantum solid-state imaging infrared sensor. The other is a method of obtaining a spatial temperature distribution using a pyroelectric sensor, which is disclosed in, for example, Japanese Patent Laid-Open No. 64-8839.
1, JP-A-57-185695, JP-A-2-18375
2. As described in JP-A-2-196932 and the like, a single pyroelectric sensor is used to mechanically scan in the vertical and horizontal directions to detect the input energy in each direction and obtain the temperature distribution. Is the way.

[0003]

By the way, in the case of the former quantum type solid-state imaging infrared sensor, the measurement temperature accuracy and the resolution are high, but since the sensor part needs to be cooled, it becomes expensive, and it is not suitable for monitoring equipment. There is a problem that it is not suitable for use.

On the other hand, the latter one using the pyroelectric sensor is
Due to the problem of low sensor sensitivity, the complexity of the mechanism, and the complexity of signal processing, there is a problem of low spatial resolution and temperature resolution.

On the other hand, for example, in order to find an abnormality in a transformer, an abnormality in the current or voltage flowing in the transformer is found by using a current detector, a voltage detector, or the like. It cannot be said that abnormalities are accurately detected by disturbances such as electric current (“Application of sensor technology to electric power equipment”, Sensor Technology Application Special Committee, Electric Cooperative Research Group, Volume 46,
See No. 4).

In consideration of the problems of the conventional sensor and the problem of the transformer abnormality detection method, the present invention uses a pyroelectric infrared sensor having advantages such as low cost, small size, and high sensitivity. It is intended to provide a distribution monitoring system.

[0007]

According to the present invention, a plurality of pyroelectric infrared detectors, which are provided in a predetermined power transmission / distribution facility or its surroundings, are provided in an array, and are incident on the detectors. Power transmission and distribution equipment monitoring including chopping means for intermittently blocking infrared rays and signal processing means for recognizing a predetermined state obtained from abnormal temperature information of the power transmission and distribution equipment based on a detection signal from the detection unit System.

[0008]

In the present invention, since the chopping section for intermittently blocking the infrared rays incident on the infrared detecting section and the rotating section for continuously rotating the infrared detecting section are provided, the temperature measurement can be realized with higher sensitivity. , It is possible to accurately monitor the abnormality of power distribution equipment by non-contact method.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a temperature distribution measuring apparatus used in an embodiment of the present invention. A pyroelectric infrared array sensor 1 having a plurality of light receiving portions arranged in a line.
1 and an infrared lens 12 for condensing infrared rays on the pyroelectric sensor array 11 on the front surface of the array sensor 11, a photocoupler 13 for detecting a chopping state is provided on a sensor rotating portion 10. There is. The photocoupler 13 is composed of a photodiode, a light emitting element such as a phototransistor, and a light receiving element.

On the other hand, the sensor rotating unit 10 is mechanically connected to the rotation starting unit 30 via the transmission 31. Further, a cylindrical chopper 40 having a chopper window portion 41 for intermittently blocking the infrared rays incident on the infrared lens 12 is provided. The chopper 40 is also the rotation starter 3
Mechanically connected to 0. The chopper 40 is provided with a reflecting plate 42 for reflecting the light emitted from the light emitting element of the photocoupler 13 to the light receiving element. Each of the mechanical units 30, 3
1, 40, 10 and the like are sensor supports 2 having a window portion 21.
Supported by 0. Further, the sensor support 20 is provided with a light receiving element 22 for detecting the rotation direction of the sensor rotating portion 10.

FIG. 2 is an external view of the chopper 40 and a view in which the cylindrical portion is opened. The chopper shown in the figure opens and closes three times in one rotation, but if the opening is set to N,
It enables the chopper N times. Chopper 40
In addition to the chopper window portion 41, a reflection plate 42 is provided at the same interval as the chopper window portion so that the timing at which the chopper window portion crosses the front surface of the sensor rotating portion reflects the light emitted from the light emitting element of the photocoupler 13. The light is reflected by the plate 42 and received by the light receiving element which is a constituent element of the photocoupler 13, thereby enabling detection.

FIG. 3 is a partially cutaway perspective view of a measuring device having a structure similar to that of the temperature distribution measuring device shown in FIG. 1 and shows a schematic structure thereof.

Now, when the rotation starter 30 is driven in a state where the infrared sensor 11 is in the form of an array and its major axis direction is set in the vertical direction, the chopper 40 continuously rotates,
Since the infrared rays incident on the infrared lens 12 are intermittently blocked, the distribution of radiant heat in the column in the direction facing the lens 12, that is, the temperature distribution can be measured. The measurable spatial range depends on the angle of view of the lens 12 and the sensor size.

At the same time, the transmission 31 causes the sensor rotating portion 1 to move.
0 is also continuously rotated at a constant rotation angular velocity. That is, the sensor rotation unit is rotated forward to scan the direction in which the sensor and the lens are facing, while driving the chopper to measure the temperature distribution on the next surface. After the measurement, by connecting the vertical temperature distributions in each direction by electrical signal processing, a two-dimensional inversion temperature distribution of space is obtained.

After the measurement of the final body surface direction is completed, the motor is rotated in the reverse direction to return to the initial body surface direction, and a standby state for the next measurement is created.

The device shown in the above example was mounted on the upper wall of a room of about 6 × 6 m, and the temperature distribution in the whole room was measured.
Note that the number of sensor light-receiving units was 10, and the number of left and right rotation steps was 30. The spatial temperature distribution at this time is 10
X30 matrix S00, 01, S00, 02, ---, S00, 10 S01, 01, S01, 02, ---, S01, 10 ----- --- --- --- --- It can be expressed by S30, 01, S30, 02, --- S30, 10. That is, if the number of sensor light receiving portions is n and the angle at which the sensor portion rotates in one open / close chopper is θ degrees, the data addresses are, for example, S01, S02,
---, S0n, data is stored for each step, the measurement is performed by rotating the direction forwards m times, and the data addresses at that time are Sm1, Sm2, ---, Smn. Therefore, it was possible to detect the presence or absence of persons in the room and the number of persons in the room by determining the distribution state of each measured temperature of 30 ° C. or higher. Here, it is difficult to discriminate between the case where there is one person near the measuring device and the case where there are a plurality of persons at one place in the distance, but it is difficult to distinguish with one measurement temperature distribution. Therefore, it was possible to determine empirically. Furthermore, the amount of activity of the occupants was able to be qualitatively determined.

By introducing the fuzzy reasoning using the membership function for the above judgment, more accurate judgment was possible.

FIG. 4 is a block diagram showing a power transmission and distribution monitoring system of the present invention in which the temperature distribution measuring device as described above is installed not in a room but in a cubicle accommodating power transmission and distribution equipment. In the figure, two transformers 220 are arranged inside the cubicle 200, and
From the cubicle to the outside of the cubicle.
On the other hand, the temperature distribution measuring device 210 is attached to the corner of the ceiling of the cubicle 200.

As shown in the figure, this temperature measuring distribution measuring apparatus 210 has two transformers 220 with a spread of an angle θ.
And infrared rays emitted from the connection line 230 can be measured.

The signal processing means 250 is means for inputting a signal output from the temperature distribution measuring device 210 and making an abnormality diagnosis.

FIG. 5 is a basic flow chart showing the operation of this embodiment.

That is, the temperature distribution measuring device 210 regularly measures the temperature distribution inside the cubicle 200 in a non-contact manner (step S1). Thereby, the transformer 22
0, the temperature of the connecting wire 230, etc. is measured. Next, the signal processing means 250 determines the occurrence of an abnormality, the type of the failure, etc., from the detected temperature signal (step S2). Alternatively, even if there is no abnormality, power consumption is predicted from the temperature information. Furthermore, from the result,
Perform maintenance and predict deterioration (step S
3).

Since the equipment in the cubicle 200 can be monitored, it is not necessary to open the cubicle 200 one by one and visually check it, as is conventionally done.

The present invention is not limited to such equipment in the cubicle, but can be applied to outdoor power transmission equipment, power distribution equipment and the like.

Further, instead of detecting the temperature of the power transmission / distribution equipment itself, the temperature in the surrounding exclusion zone may be detected. That is, by detecting the spatial temperature distribution of the exclusion zone, when a person enters, it can be immediately detected by the human body temperature of the person, so that a warning can be given.

Further, the infrared detecting section is not limited to a rotating one, but may be another type such as a fixed one.

[0028]

As is apparent from the above description,
The present invention is directed to a predetermined power transmission / distribution facility or its surroundings, and is provided with a plurality of arrayed pyroelectric infrared detection units, and chopping means for intermittently blocking infrared rays incident on the detection units. And a signal processing means for recognizing a predetermined state obtained from temperature information such as abnormality of power transmission and distribution equipment based on a detection signal from the detection unit, so that abnormality such as power transmission and distribution equipment and intrusion of people can be performed with high sensitivity. Can be detected.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a temperature distribution measuring device used in an embodiment of the present invention.

FIG. 2 is a diagram showing a chopper of a temperature distribution measuring device used in an embodiment of the present invention.

FIG. 3 is a schematic perspective view of a temperature distribution measuring device used in an embodiment of the present invention.

FIG. 4 is a configuration diagram of a power transmission and distribution monitoring system according to an embodiment of the present invention.

FIG. 5 is a basic flowchart showing the operation of the embodiment.

[Explanation of symbols]

 10 Sensor Rotating Section 11 Infrared Sensor 12 Infrared Lens 13 Photocoupler 20 Support 21 Support Window Window 22 Photoreceptor 30 Rotation Starting Section 31 Transmission 40 Chopper 41 Chopper Window 42 Reflector 200 Cubicle 210 Temperature Distribution Measuring Device 220 Transformer 230 connection line 250 signal processing means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02B 5/00

Claims (3)

[Claims] 1. A pyroelectric infrared detection unit provided in a plurality of arrays, which is directed to a predetermined power transmission / distribution facility or its periphery, and chopping for intermittently blocking infrared rays incident on the detection unit. A power transmission and distribution facility monitoring system comprising: means and signal processing means for recognizing a predetermined state obtained from abnormal temperature information of the power transmission and distribution facility based on a detection signal from the detection unit. 2. The power transmission / distribution equipment monitoring system according to claim 1, wherein the power transmission / distribution equipment is a transformer or a wiring connection portion provided in the cubicle. 3. The power transmission and distribution facility monitoring system, wherein the detection unit is directed to a restricted area of the power transmission and distribution facility.