JPH08194878A - Method for detecting abnormality - Google Patents

Abstract

PURPOSE: To provide an abnormality detecting method capable of excluding the influence of disturbance and evading misinformation independently of practical changes in transparent gas concentration and non-transparent gas concentration to be respectively independently changed with the lapse of time due to abnormality occurance which is different in accordance with the sort of an electric apparatus installed in a space to be detected. CONSTITUTION: First sensors S1, S3 for detecting the concentration of transparent gas generated due to the occurance of abnormality and 2nd sensors S2, S4 for detecting the concentration of non-transparent gas are arranged independently on the inside and outside of a space 1 to be detected. Ranges of values to be detected by the 1st and 2nd sensors S1, S2 are respectively divided into plural areas and a normal or abnormal degree is discriminated based upon a state including the outputs of the 1st and 2nd sensors S1, S2 arranged in the space out of plural states obtained by combining respective areas and a difference between the output of the 1st sensor S1 or the 2nd sensor S2 arranged in the space 1 and the ouptut of the 1st sensor S3 or the 2nd sensor S4 arranged on the outside of the space 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a power panel of main equipment such as a power station and substation, various power panels such as a cubicle of a factory, a computer room, and a place where an electric appliance is used as a detection target space. A method for detecting anomalies caused by a fire in a detection target space,
The present invention relates to an abnormality detection method, which is provided with an abnormality detection sensor that detects a state that changes with the occurrence of an abnormality in the detection target space, and that determines an abnormality when the output of the abnormality detection sensor exceeds a set value.

[0002]

2. Description of the Related Art In a conventional abnormality detecting method of this type, an abnormality detecting sensor for detecting a state that changes with the occurrence of an abnormality in the detection target space is provided inside the detection target space. Some output an alarm when it determines that the output is abnormal when the output exceeds the set value. Here, the detection target space is, for example, a power panel, and as the abnormality detection sensor, a hot-wire semiconductor gas sensor that detects an odor generated from the covering material of the wire due to heating, or a light transmission that detects smoke caused by a fire. Type smoke sensors were used.

[0003]

However, according to the above-mentioned conventional abnormality detection method, when the output of the abnormality detection sensor installed inside the space to be detected exceeds the set value, it is immediately determined that there is an abnormality. Therefore, even if the abnormality detection sensor detects an abnormality occurring outside the detection target space, it is as if the detection target space detected an abnormality not inside the detection target space. There was an inconvenience that an alarm was issued as if it was an abnormality. Furthermore, even in normal use, electric devices installed in the detection target space generate a little heat, and in such a case, for example, if a odor is generated from the covering material of the electric wire, the hot wire semiconductor gas sensor. However, there is also the inconvenience that it may give an erroneous alarm in response to. An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[0004]

To achieve this object, the first characteristic configuration of the abnormality detecting method according to the present invention is that the abnormality detecting sensors are separately provided inside and outside the detection target space. Even if the output of the abnormality detection sensor provided inside the space is equal to or more than the set value, but is less than the output of the abnormality detection sensor provided outside the detection target space, it is determined to be normal. . The second characteristic configuration is, in the detection target space, a first sensor that detects the concentration of transparent gas generated due to the occurrence of an abnormality in the detection target space, and a non-transparent that occurs due to the occurrence of an abnormality in the detection target space. Provided with a second sensor for detecting the concentration of the gas, the range of possible values of the first sensor and the second sensor is divided into a plurality of regions, respectively, the output of the first sensor and the second sensor, each region The point is to determine the degree of normality or abnormality based on which of a plurality of states that are combined. The third characteristic configuration is a first sensor that detects the concentration of a transparent gas generated inside and outside the detection target space due to the occurrence of an abnormality in the detection target space, and occurs along with the occurrence of an abnormality in the detection target space. A second sensor for detecting the concentration of the non-transparent gas is separately provided, and the range of possible values of the first sensor and the second sensor is divided into a plurality of regions, respectively, and the second sensor is provided inside the detection target space. The output of the one sensor and the second sensor is included in any of a plurality of states in which each region is combined, and the output of the first sensor or the second sensor provided inside the detection target space, and The point is to determine the degree of normality or abnormality based on the magnitude relation of the outputs of the first sensor or the second sensor provided outside the detection target space.

[0005]

According to the first characteristic configuration, when the output of the abnormality detection sensor provided inside the detection target space is equal to or more than the set value, normally, it should be determined that the state is abnormal. If the output is below the output of the abnormality detection sensor provided outside the detection target space, it is determined that the abnormality detection sensor provided inside the detection target space has responded to the abnormality that occurred outside the detection target space. Then, it is determined that the detection target space is normal. According to the second characteristic configuration, the range of values that can be taken by the different types of sensors provided in the detection target space is divided into a plurality of regions, and the transparent gas concentration is changed independently with time from the occurrence of an abnormality. And no matter how the non-transparent gas concentration actually changes, the degree of normality or abnormality is accurately determined based on which of a plurality of states in which each region is combined is included. Of. According to the third characteristic configuration, in addition to the above-described second characteristic configuration, since different types of sensors are provided outside the detection target space, as described in the operation of the first characteristic configuration described above. Eliminate the effects of disturbance.

For example, when various electric parts provided in a switchboard or the like generate heat abnormally, not only flammable gases such as carbon monoxide (CO), hydrogen H ₂ , acetaldehyde and phenol but also non-transparent gases are used as transparent gases. Some smoke is generated. Therefore, by providing a semiconductor type gas sensor for detecting the odorous gas concentration such as burnt odor as the first sensor in the ventilation passage and a scattered light type smoke sensor for detecting the smoke concentration as the second sensor, The above-mentioned action is exhibited.

[0007]

According to the present invention, the abnormality that has occurred outside the detection target space, that is, the influence of disturbance, is eliminated, and the occurrence of an abnormality that differs depending on the type of electrical equipment installed in the detection target space can be independently elapsed from each other. It has become possible to provide an anomaly detection method capable of avoiding false alarms, no matter how the transparent gas concentration and the non-transparent gas concentration that change dynamically are actually changed.

[0008]

EXAMPLES Examples will be described below. As shown in FIG. 1, an abnormality detection device (not shown) such as a fire is attached to a switchboard 1 serving as a detection target space R installed in a control room 2 of a power plant. The switchboard 1 contains various electrical components (not shown) necessary for power distribution, and when an abnormality such as a fire occurs, not only smoke which is a non-transparent gas but also flammable odor gas which is a transparent gas, etc. Occurs. Therefore, a vertical air passage (not shown) is formed in the switchboard 1 and a first sensor S1 using a semiconductor gas sensor for detecting the concentration of odorous gas such as burnt odor is provided inside the air passage. A second sensor S2, which is a scattered light type smoke sensor for detecting the smoke concentration, is provided, while a first sensor S3 using a semiconductor gas sensor is similarly provided outside the switchboard 1 to detect the presence or absence of disturbance. A second sensor S4, which is a scattered light smoke sensor, is also provided.

The anomaly detecting device includes an alarm device having a warning lamp which is a visually recognizing warning device and an alarm which is an audibly recognizing warning device, and the values of the first and second sensors S1 and S2. It is configured by a computer-based abnormality detection circuit that activates the alarm device by determining that an abnormality has occurred in the switchboard 1 when an input value is greater than or equal to a predetermined value.

The first sensor S1 is a sensor which detects a change in electric conductivity due to gas adsorption on the surface of a metal oxide semiconductor in a state of being heated to 300 to 450 ° C., for example, a platinum wire. A hot-wire semiconductor gas sensor that applies a metal oxide semiconductor on a coil and sinters it to detect the change in electrical conductivity as a change in the combined resistance of the metal oxide semiconductor and the platinum wire has high sensitivity and good stability. Therefore, it is more preferable. The second sensor S2 includes a light emitting portion and a light receiving portion, and utilizes a scattering phenomenon that occurs when light from the light emitting portion hits smoke particles, and a photoelectric current change caused by the photoelectric element of the light receiving portion receiving scattered light. Is used to convert to smoke density.

The ventilation channel is installed in the casing covering the switchboard 1 through a plurality of ventilation slits formed on the surface of the casing so that the second sensor S2 malfunctions. While preventing the entry of harmful light, smoke or gas from the detection target space is made to flow in from the lower part of the ventilation channel by the ascending air current generated by the heat generation from the semiconductor gas sensor S1. Therefore, the sensors S1 to S4 detect the gas flowing through the switchboard 1 and convection in the control room 2.

A method of judging an abnormality by the abnormality detecting device will be described below. The abnormality detection device divides a range of values that can be taken by the first sensor S1 and the second sensor S2 provided inside the detection target space 1 into a plurality of regions, respectively. One sensor S1
And the output of the second sensor S2 is included in any of a plurality of states in which the respective regions are combined, and the output of the first sensor S1 or the second sensor S2 provided inside the detection target space 1. The degree of normality or abnormality is determined based on the magnitude relation of the outputs of the first sensor S3 or the second sensor S4 provided outside the detection target space 1. To elaborate,
As shown in FIG. 2, the anomaly detection device uses values a, b, and c that can be taken by the respective outputs of the odor sensor that is the first sensor S1 and the smoke sensor that is the second sensor S2.
And a ', b', c'divided into three stages, and the actually measured value was divided into four areas indicated by "0", "1", "2", "3" in the figure. Which area it belongs to is determined. Then, when the belonging region is specified, the first sensor S1 or the second sensor S2 provided inside the detection target space 1
And the output of the first sensor S3 or the second sensor S4 provided outside the detection target space 1, the magnitude relationship is determined,
As shown in FIG. 3, it is determined which of “normal”, “preliminary alarm”, “disturbance”, and “main alarm” corresponds based on the magnitude relationship preset for each area.
That is, the first sensor S provided inside the detection target space 1
If the output of either the first sensor S2 or the second sensor S2 is larger than the output of the first sensor S3 or the second sensor S4 provided outside the detection target space 1, the area "
"0" indicates "normal", area "1" indicates "preliminary warning", area "2" indicates "main warning", area "3"
In the case of, it is determined that the “main alarm”, and the outputs of both the first sensor S1 and the second sensor S2 provided inside the detection target space 1 are the first sensors provided outside the detection target space 1. When the output of both S3 or the second sensor S4 is less than or equal to the output of the area "0", "normal", area "1"
"Disturbance" in the case of, "Disturbance" in the area "2",
In the case of area "3", it is determined to be "main alarm". Here, "preliminary alarm" refers to the case where some symptom of abnormality can be seen but the urgency is not so high. Some abnormality has occurred outside, but since there is no abnormality inside the switchboard 1,
"Alarm" means a state in which neither an alarm nor a warning lamp is activated. "This alarm" indicates a state in which some abnormality has occurred and the degree of urgency is high, and the warning lamp blinks and an alarm is issued. When determining the above-mentioned region, as shown in FIGS. 4 and 5, the value of either the first sensor S1 or the second sensor S2 provided inside the detection target space 1 is set to the level a for 30 seconds or more. Hold, or 1
When the level b is maintained for 0 seconds or more, or when the level c is maintained for 4 seconds or more, it is determined that each level is updated, and if the sensor value decreases during each set time, the area is not updated and the area before that is updated. Continued.

Another embodiment will be described below. In the previous embodiment, the case where the detection target space is the switchboard 1 has been described.
The detection target space is not limited to this, and it can be applied to various power panels such as power panels for main equipment such as power plants and substations, cubicles in factories, etc., as well as places where computer rooms and other electrical equipment are used. Although the semiconductor gas sensor S1 for detecting odor has been described as the transparent gas sensor, the invention is not limited to this.
For example, a gas sensor of any type such as a catalytic combustion sensor can be used, and a carbon monoxide (CO) sensor or a hydrogen chloride (HCl) sensor may be used instead of the odor sensor. That is, as shown in FIG. 6 to FIG. 8, there is a difference in the time-dependent change in the concentration of the generated gas depending on the material used for the switchboard, etc., so that the sensor can be selected according to each characteristic. The types of the first sensor and the second sensor are not limited to one type, and it is possible to use a plurality of types of sensors at the same time. In the above embodiment, the threshold value a for discriminating the area,
The values of b, c, a ', b', and c'are not specified, but they can be set appropriately according to the characteristics of the gas to be detected. For example, as an insulator for electrical components. In order to detect the odor generated when the phenol resin used is heated, when a hot-wire semiconductor gas sensor is used, the measurement range is 0 to 100 ppm, the level a is 2 ppm in terms of ethanol, and the level b is 6 ppm, Level c
Can be used as a preferable value. Other,
In the smoke sensor, the measurement range is 0 to 15 mg / m ³ , the level a ′ is 2 mg / m ³ when the extinction rate is converted into dust, the level b ′ is 6 mg / m ³ , and the level c ′ is 10 mg / m ^3. It can be used as a preferable value. In the above embodiment, the value of each sensor is divided into three levels, and it is 0 "," 1 "," 2 "," 3 ".
Although the four areas shown by are considered, the number of divisions of the sensor value and the number of areas are not limited to this. Without performing area discrimination,
Even if the output of the abnormality detection sensor provided inside the detection target space 1 is equal to or more than a set value indicating abnormality by providing a single or a plurality of abnormality detection sensors inside and outside the detection target space 1, respectively. When the output is less than the output of the abnormality detection sensor provided outside the detection target space 1, it is possible to detect the influence of disturbance by determining that the output is normal. That is, when the output of the abnormality detection sensor provided inside the detection target space 1 is equal to or more than the set value, it is normally determined that the abnormality is detected, but it is provided outside the detection target space 1. If the output is less than or equal to the output of the abnormality detection sensor, it is determined that the abnormality detection sensor provided inside the detection target space 1 has responded to an abnormality occurring outside the detection target space 1, and the detection target space 1 is detected. In this case, it is determined to be normal. Even if no sensor is provided inside or outside the detection target space 1, the first sensor S1 that detects the concentration of the transparent gas generated in the detection target space 1 due to the occurrence of an abnormality in the detection target space 1, and the detection target space 1 And a second sensor S2 for detecting the concentration of the non-transparent gas generated due to the occurrence of the abnormality, and the range of values that can be taken by the first sensor S1 and the second sensor S2 is divided into a plurality of regions,
The degree of normality or abnormality may be determined based on which of a plurality of states in which the respective regions are combined, the outputs of the first sensor S1 and the second sensor S2. However, in this case, the influence of disturbance cannot be determined.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is a plan view of a main part

FIG. 2 is an explanatory diagram of area discrimination

FIG. 3 is an explanatory diagram of abnormal state determination

[Fig. 4] Flow chart

FIG. 5: Flow chart

FIG. 6 is a characteristic diagram of generated gas.

FIG. 7: Characteristic diagram of generated gas

FIG. 8: Characteristic diagram of generated gas

[Explanation of symbols]

 1 Detection target space S1, S3 First sensor S2, S4 Second sensor

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor ▲ Hiro ▼ and Masashi Masashi 2-5-4 Mitsuyanaka, Yodogawa-ku, Osaka City, Osaka Prefecture New Cosmos Electric Co., Ltd. (72) Nobuhiro Suzuki Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture 4-1, Egasaki-cho, Tokyo Electric Power Company, Inc. Energy and Environmental Research Laboratory (72) Inventor Hidetoshi Hanashima 3-3-3 Higashiueno, Taito-ku, Tokyo Toden Sekkei Inc. Ueno Center (72) Inventor Satoshi Takahashi Tokyo 3-3-3 Higashi-Ueno, Taito-ku, Tokyo Toden Design Co., Ltd. Ueno Center

Claims (3)

[Claims] 1. A detection target space (1) is provided with an abnormality detection sensor (S1) for detecting a state that changes with the occurrence of an abnormality in the detection target space (1), and the abnormality detection sensor (S1) An abnormality detection method for determining an abnormality when an output exceeds a set value, wherein the abnormality detection sensors (S1, S3) are separately provided inside and outside the detection target space (1) to detect the abnormality. Even if the output of the abnormality detection sensor (S1) provided inside the target space (1) is greater than or equal to the set value, it is less than or equal to the output of the abnormality detection sensor (S3) provided outside the detection target space (1). Anomaly detection method that determines normal in some cases. 2. A first sensor (S1) for detecting a concentration of transparent gas generated in the detection target space (1) when an abnormality occurs in the detection target space (1), and the detection target space (1). And a second sensor (S2) for detecting the concentration of the non-transparent gas generated due to the occurrence of the abnormality of the first sensor (S1) and the second sensor (S2). The first sensor (S1) divided into regions
And the output of the second sensor (S2) is included in a plurality of states in which the respective regions are combined,
Anomaly detection method that determines the degree of normality or abnormality. 3. A first sensor (S1, S3) for detecting the concentration of a transparent gas generated inside and outside the detection target space (1) when an abnormality occurs in the detection target space (1), and the detection target. A second sensor (S2, S4) for detecting the concentration of the non-transparent gas generated due to the occurrence of an abnormality in the space (1) is separately provided, and the first sensor (S1) and the second sensor (S) are provided.
The range of possible values of 2) is divided into multiple areas,
The first sensor (S provided inside the detection target space (1)
1) and which of the plurality of states in which the outputs of the second sensor (S2) are included in each region, and
The first sensor (S provided inside the detection target space (1)
Normal) or abnormal based on the magnitude relationship between the output of 1) or the second sensor (S2) and the output of the first sensor (S3) or the second sensor (S4) provided outside the detection target space (1). Anomaly detection method to determine the degree of.