JP3482128B2 - Anomaly detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device for detecting an abnormal portion such as a ground fault or a short circuit inside a gas-insulated electric power device by using a gas sensor.

FIG. 15 shows the structure of an abnormality detecting device using a conventional gas sensor disclosed in, for example, Japanese Patent Laid-Open No. 8-271477 and the structure of a gas sensor used in this device. In FIG. 15, 1 is an insulating gas S
Gas sealed container in which F ₆ is enclosed, 2 is a spacer that divides each gas compartment 1a, 1b in the gas sealed container, 3 is a central conductor supported in the central part in the sealed container 1 by the spacer 2, and 4 is a central conductor A ground fault occurrence point where a ground fault accident occurred between the gas sealed container 1 and the gas sealed container 1, 11a and 11b are gas sensors for detecting SF ₆ gas sealed in the gas sealed container 1, and 16 is output from the sensors 11a and 11b. A sensor signal processing device for processing a signal.

Next, GIS (Gas Insulated Switchgear:
The operation of the gas sensor 11 will be described by taking as an example the detection of SF ₆ decomposed gas generated due to a ground fault of SF ₆ gas in the gas insulated switchgear). First, the GIS is divided into a plurality of gas sealed spaces by a plurality of spacers 2. High voltage and high current electricity is flowing through the central conductor 3, and the gas sealed container 1
The insulation performance is maintained by SF ₆ gas that is hermetically sealed in a and 1 b.

However, for example, when an abnormality 4 such as a ground fault occurs inside the gas sealed container 1a, an arc is generated between the central conductor 3 and the gas sealed container 1a to cause SF ₆ inside the gas sealed container 1a. The gas is decomposed, and the decomposed gas is generated near the ground fault occurrence point 4. The decomposed gas generated at this time diffuses in the hermetically sealed container 1a, and eventually reaches the sensor-containing portion 12a and is detected by the sensor 11a.

In this way, the gas sensor 11 is provided for each of the gas sealed spaces 1a and 1b in order to identify the internal abnormality occurrence section.
a and 11b are attached, and it is determined that an abnormality has occurred in the gas sealed space where the gas sensor has detected the SF ₆ decomposition gas.

[0006]

Since the conventional gas sensor is constructed as described above, each gas sensor reacts with a small amount of miscellaneous gas components other than SF ₆ originally contained in the sealed container, and the detection sensitivity of the sensor. Has a problem that it is not affected by this miscellaneous gas component and high-sensitivity detection cannot be performed.

[0007] In particular, when the concentration of miscellaneous gas is influenced by the condition of GIS, the surrounding environment, etc. and changes daily, and is not always the same for each gas sealed container, continuous measurement is not performed. However, there is a problem in that it is very difficult to grasp the sensor output amount based on the concentration of the miscellaneous gas, and it is possible to detect only the abnormal gas whose concentration greatly exceeds the expected miscellaneous gas concentration range.

This problem was solved in order to solve the above-mentioned problems, and SF in gas-insulated electric equipment is to be solved.
It is an object of the present invention to provide an abnormality detection device that removes the influence of miscellaneous gases contained in ₆ gases and detects decomposition gas generated due to abnormality with high sensitivity.

[0009]

[Means for Solving the Problems]

[0010] abnormality detecting apparatus according to the invention of this, in the abnormality detecting apparatus for detecting the gas sensor abnormality gas generated by the internal abnormality of the gas-insulated electrical equipment, gas space filled with insulating gas of the gas-insulated electrical equipment independent in the <br/> sealed on a container, comprising: a plurality of gas sensors were spaced along the propagation direction of the abnormal gas in the gas space, in the plurality of gas sensors, and a measuring means for measuring the output difference between the two gas sensor It is a thing.

[0011] abnormality detection device according to this invention are those in which a plurality of gas sensors to respective upper and lower sealed container.

[0012] abnormality detecting apparatus according to the invention of this is to a plurality of gas sensors were spaced arranged in the longitudinal direction of the sealed container.

[0013] abnormality detecting apparatus according to the invention of this is to be branched from the sealed container gas pipe which is a pipe, is obtained by spaced apart a gas sensor with a plurality of branched gas pipe.

[0014] abnormality detecting apparatus according to the invention of this is, with different length of the gas pipe which is plumbed to the gas sensor, in which varying the diffusion movement time of abnormal gas to one of the gas sensors.

The abnormality detection device according to this invention, the middle narrowed portion of the gas pipe which is plumbed to the gas sensors with different diameters are provided, in which varying the diffusion movement time of abnormal gas to one gas sensor .

The abnormality detection apparatus according to the invention of this is an on-off valve provided in the middle of the gas pipe which is plumbed to each gas sensor is to limit the spread of abnormal gas to one of the gas sensors.

The abnormality detection device according to this invention, branched from a sealed vessel with different diameter aperture portion provided in the middle of the pipe gas pipe, varying the diffusion movement time of abnormal gas to one gas sensor It is a thing.

The abnormality detection apparatus according to the invention of this is an on-off valve provided in the middle of the branches from the sealed container gas pipe which is a pipe, it is to limit the spread of abnormal gas to one of the gas sensors.

The abnormality detection apparatus according to the invention of this is that with arranging a plurality of gas sensors on the same sensor contained sections and these gas sensors arranged in each room where the gas inflow is provided with an opening portion of the different kind of diameter Is.

The abnormality detection apparatus according to the invention of this, in the abnormality detecting apparatus for detecting the gas sensor abnormality gas generated by the internal abnormality of the gas-insulated electrical equipment, gas adjacent sealed insulating gas in the gas-insulated electric device Space
A plurality of gas sensors, which are spaced apart along the diffusion direction of the abnormal gas, and a measuring means for measuring the output difference of two gas sensors among the plurality of gas sensors, in a continuous gas pipe connecting the sealed containers so as to be continuous. Is.

The abnormality detection apparatus according to the invention of this is a throttle portion for adjusting the gas flow rate in the middle of the communication gas pipe is provided, in which varying the diffusion movement time of abnormal gas to one of the gas sensors.

The abnormality detection apparatus according to the invention of this is an on-off valve provided in the middle of the communication gas pipe, it is to limit the spread of abnormal gas to one of the gas sensors.

The abnormality detection device according to this invention comprises a failure detecting means for detecting an abnormality occurring in the current path of the gas space installed gas sensor at a predetermined block unit, is installed in the pipe section by the signal of the failure detecting means And a control means for closing the on-off valve.

The abnormality detection device according to this invention comprises a failure detecting means for detecting an abnormality occurring in the current path of the gas space installed gas sensor at a predetermined block unit, to operate the instrument by a signal of the failure detecting means And a control means.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 1
a is a gas sealed container, 4 is a ground fault occurrence point, 11a is a gas sensor attached to the upper part of the gas sealed container 1a, and 11a '.
Is a gas sensor attached to the lower part of the gas sealed container 1a, and 12a and 12a 'are gas sensors 11a and 11a, respectively.
Reference numeral 17 denotes a sensor enclosing portion that encloses a ′ and gas is introduced from the sealed container 1, 17 is a differential amplifier in the sensor signal processing device 16, and 18 is a processing unit that processes an output signal of the differential amplifier 17. In FIG. 2, 30a and 30a 'are outputs of the gas sensors 11a and 11a', and 31 is an output difference of the gas sensors 11a and 11a 'output from the differential amplifier 17.

Next, regarding the operation of this embodiment, GI
The ground fault detection in S will be described as an example. In FIG. 1, G
Gas sensors 11a and 11a 'are attached to the upper and lower portions of each gas sealed container of the IS, and when a ground fault 4 occurs inside, a decomposed gas is generated, and the gas sensors 11a and 11a' respond to the decomposed gas. Then electrical signal 30
The outputs of a and 30a 'are shown.

In this state, when a ground fault occurs inside the gas-tight container, the arc causes a decomposed gas, and the decomposed gas generated at this time is initially in a high temperature state, and is decomposed by the convection effect or the like. First, it rises to the upper part in the hermetically sealed container 1a, and eventually diffuses naturally throughout the hermetically sealed container. The sensor outputs 30a and 30a 'output from the gas sensors 11a and 11a' show a slight response to the base miscellaneous gas before the accident as shown in FIG.
After the occurrence of the accident, the sensor output 30a of the gas sensor 11a first rises and the sensor output 3 of the gas sensor 11a 'rises with a delay as the decomposed gas generated by the above-described accident moves.
0a 'responds.

At this time, when an abnormality is detected by one gas sensor, the threshold value for the determination cannot be set to a value less than that because there are outputs of miscellaneous gas components that differ depending on the gas sealed container and environmental conditions. Although impossible, by mounting two gas sensors on one gas sealed container, the output due to the miscellaneous gas commonly present in the two sensor outputs 30a and 30a 'is canceled. As for the decomposed gas generated by the ground fault, the arrival time of the decomposed gas differs depending on the sensor mounting location, and therefore appears as a difference.

In this way, the gas sensors 11a, 11
The sensor outputs 30a and 30a ′ of a ′ are used as the signal processing device 16
If the sensor output difference 31 is taken by the differential amplifier 17 inside and a slight difference is found, it is possible to determine that the gas sealed container is abnormal.

Embodiment 2. In the first embodiment,
Utilizing the fact that the time during which gas diffuses and moves varies depending on the location of the sealed container, the gas sensor 1
1a and 11a 'were attached, and high-sensitivity detection was performed by observing the signal output difference between the gas sensors 11a and 11a'.
By making a difference in the mounting method of the gas sensor between the gas sealed container and the gas sealed container, it is possible to make a difference in the diffusion transfer time of the gas and obtain the same effect.

FIG. 3 shows the configuration of the abnormality detecting device according to the present embodiment. In the figure, 13a and 13a 'are gas pipes for introducing gas from the gas sealed container 1a to the sensor inclusions 12a and 12a', respectively.

The decomposed gas generated by the ground fault is the sealed container 1.
It becomes different depending on the shape of the hermetically sealed container 1a to make the inside uniform. In particular, when the gas pipes 13a, 13a 'are provided between the hermetically sealed containers 1a, 1a' and the sensor inclusions 12a, 12a ', the gas pipe diameter is reduced. Alternatively, by increasing the length, it is possible to delay the time when the decomposition gas diffuses and moves.

Here, taking the difference between the outputs of the two sensors,
Even if there is a change due to ordinary miscellaneous gases, the output difference is almost zero, so the output difference is almost zero, but when an abnormality occurs, the concentration in the sealed container 1a changes rapidly, and the decomposition gas in the gas pipe section changes. Diffusion shows different diffusion effects depending on the pipe diameter and pipe length in response to this rapid change. Due to this effect, a concentration difference is temporarily generated between the sensor inclusions 12a and 12a ', which is detected as a difference in sensor output, and it is possible to perform abnormality detection that does not depend on the concentration of miscellaneous gas.

Embodiment 3. In the second embodiment,
By utilizing the fact that the time during which gas diffuses and moves varies depending on the diameter and length of the gas pipe, a difference in the concentration of decomposed gas due to a ground fault is created in the sensor internal part, and the effect of miscellaneous gas concentration can be observed by observing the signal output difference Was removed, but by installing a throttle part with a locally narrowed diameter inside one gas pipe,
The same effect can be obtained.

FIG. 4 shows the configuration of the abnormality detection device according to this embodiment. In the figure, 14 is a gas pipe 13a '.
It is a diaphragm part attached to. The narrowed portion 14 prevents the decomposed gas generated at the time of the ground fault from diffusing into the sensor inner package portion 12a ′, and it takes time to reach the same concentration as that in the gas sealed container 1a than the sensor inner package portion 12a. I need
The output difference between the sensors 11a and 11a 'is detected.

In the second embodiment, the gas pipe 13
Although different pipe shapes were used for a and 13a ', the gas pipe 13a,
Even if the outer shape of 13a ′ is the same, a difference in concentration can be created when an abnormality occurs, and by taking the difference between the sensor outputs, it is possible to perform abnormality detection that does not depend on the concentration of miscellaneous gas.

Fourth Embodiment In the third embodiment,
A high-sensitivity detection was performed by providing a narrowed portion 14 in the gas pipe section and creating a difference in the concentration of decomposed gas due to a ground fault in the sensor inclusion section and looking at the signal output difference, but install a gas valve in the middle of one gas pipe. Can obtain the same effect.

FIG. 5 shows the configuration of the abnormality detection device according to this embodiment. In the figure, 15 is a gas pipe 13a '.
It is a gas valve installed in the middle of. The gas flow path inside the gas valve 15 is bent similarly to the throttle portion 14 described above, and is thinner than the piping. Therefore, the gas valve 15 prevents the decomposed gas generated at the time of the ground fault from diffusing into the sensor inner package portion 12a ', and it takes time for the decomposed gas to reach the same concentration as that in the gas sealed container 1a than the sensor inner package portion 12a. By taking the difference between the sensor outputs, it is possible to detect an abnormality that does not depend on the concentration of the miscellaneous gas. Of course, the same effect can be obtained by changing the number of gas valves 15 attached to the gas pipes between the gas pipes 13a and 13a '.

Embodiment 5. In the second embodiment,
By changing the diameter and length of the two gas pipes, the time required for gas diffusion was changed, and a difference in the decomposed gas concentration due to a ground fault was created in the sensor internal part. The same effect can be obtained simply by changing the mounting location.

FIG. 6 shows the configuration of the abnormality detecting device according to this embodiment. As shown in the figure, a gas pipe 13 is extended from the gas sealed container 1a, and gas sensors 11a and 11a 'are provided in the gas pipe 13 at a predetermined distance. At this time, the decomposed gas generated inside the gas hermetic container 1a first reaches the gas sensor 11a at a short distance from the gas hermetic container 1a, and then reaches the separated gas sensor 11a '. In this way, the difference in gas arrival time causes a temporary difference in the decomposed gas concentration, and by taking the difference in the sensor output with the differential amplifier 17, it is possible to perform abnormality detection independent of the miscellaneous gas concentration. In addition, a gas valve and a throttle part are provided in the middle of the gas pipe 13, and each gas sensor 11a, 11
You may widen the gas concentration difference between a '.

Sixth Embodiment In the above embodiments, the case where the gas space of the gas sealed container is independent has been described, but there are cases where a plurality of gas sealed containers are connected by gas pipes and the gas space is continuous. In this case, even if two gas-tight containers are not attached, one gas-tight space is attached to each gas-tight space, and the same output can be obtained by measuring the output difference of each sensor.

7 and 8 show the configuration of the abnormality detecting device according to this embodiment. In FIG. 7, 1a and 1b are gas sealed spaces, 11a and 11b 'are gas sensors attached to the gas sealed spaces, and 12a and 12b are gas sensors 11a and 11b.
b'includes a sensor containing portion, and 24 is a gas sealed container 1
It is a communication gas pipe that connects the gas spaces a and 1b. In FIG. 8, reference numerals 30a and 30b denote outputs of the sensors 11a and 11b when a ground fault occurs in the gas sealed container 1a, and 3
Reference numeral 1 is an output of the differential amplifier 17 when a ground fault occurs in the gas sealed container 1a. In the state where no abnormality such as an accident has occurred, the communication gas pipe 24 makes the concentration of the miscellaneous gas in the gas sealed container uniform by natural diffusion. For example, when a ground fault 4 occurs in the gas sealed container 1a, the decomposition gas generated at that time is first generated in the gas sealed container 1a.
It diffuses inside a, and eventually diffuses into the gas sealed container 1b through the communication gas pipe 24.

In this way, the difference in gas arrival time causes a temporary difference in the decomposed gas concentration in the sensor-containing portions 12a and 12b, and the sensor output difference 31 is detected by the differential amplifier 17 and does not depend on the miscellaneous gas concentration. Anomaly detection can be performed. Of course, conversely, when a ground fault occurs in the gas sealed container 1b, when the difference between the sensor signals in the sensor signal processing device 16 is detected by the differential amplifier 17, and when a ground fault occurs in 1a. A sensor output difference 31 of opposite sign is detected.

Embodiment 7. In the sixth embodiment,
When the gas-tight containers were in communication, the difference between the sensors attached to each container was taken to eliminate the effect of the concentration of miscellaneous gases. The effect can be obtained.

FIG. 9 shows the configuration of the abnormality detection device according to this embodiment. The sensor inclusions 12a, 12 are separated from the communication gas pipe 24 that communicates the two gas-tight containers 1a, 1b.
b is provided. The decomposition gas generated inside the gas sealing volume 1a diffuses into the adjacent gas sealing container 1b through the communication gas pipe 24. At this time, the decomposition gas reaches the sensor inclusion 12a provided in the communication gas pipe 24, Next, it arrives at the sensor inclusion 12b with a delay. The difference due to the gas concentration time at this time is detected by the differential amplifier 17 as the output difference of the gas sensors 11a and 11b ', and the abnormality detection independent of the miscellaneous gas concentration can be performed.

Embodiment 8. In the fifth and seventh embodiments, the sensor inclusions are separately attached to one communication gas pipe 24, and the difference between the sensor outputs is removed to eliminate the influence of the dust gas concentration. By providing a throttle part in the middle of the communication gas pipe 24 connecting the parts, as in the third embodiment, the diffusion and transfer time of gas from one sensor inclusion part to the other sensor inclusion part is lengthened, and the effect is further enhanced. be able to.

FIG. 10 shows the configuration of the abnormality detection device according to this embodiment. In the figure, 14 is a communication gas pipe 2
It is a diaphragm part attached to No. 4. With this throttle unit 14,
The decomposed gas generated at the time of the ground fault is prevented from diffusing into the sensor-containing section 12b, and the time during which the concentration difference with the sensor-containing section 12a is generated becomes longer, which makes it easier to detect an abnormality.

Ninth Embodiment In the eighth embodiment,
An attempt is made to perform a more reliable abnormality detection by providing a narrowed portion 14 in the middle of the communication gas pipe 24 connecting the two sensor inclusions and creating a difference in the decomposition gas concentration due to a ground fault in the sensor inclusions and observing the difference in the sensor outputs. However, a similar effect can be obtained by attaching a valve (open valve) instead of the throttle portion 14.

FIG. 11 shows the configuration of the abnormality detecting device according to the present embodiment. In the figure, 15 is a communication gas pipe 2
It is a gas valve attached to No. 4. This gas valve 15
As a result, the decomposed gas generated at the time of the ground fault causes the sensor inclusion 12
It is prevented from diffusing into b, and the time during which the concentration difference with the sensor inclusion portion 12a is generated becomes longer, and it becomes easier to detect an abnormality. The valve 15 is controlled to be closed by a detection signal from an abnormality detection unit (not shown).

Embodiment 10. In the above-described embodiments, one sensor is attached to one sensor inner package portion, but two sensors are provided in one inner package portion, and by adjusting the diffusion amount of gas respectively, It is possible to detect the concentration difference of the decomposed gas diffusion caused by the abnormality such as the ground fault by removing the concentration of the miscellaneous gas.

FIG. 12 shows the configuration of the abnormality detecting device according to this embodiment. In the figure, 11a and 11a 'are gas sensors, 12 is a sensor containing portion containing the gas sensors 11a and 11a', and 25a and 25a 'are gas sensors 11
a and a gas diffusion port provided in each of 11a '. At this time, if the diameter of the diffusion port 25a 'is made extremely smaller than the diameter of the diffusion port 25a, it is a gradual change with respect to the normal change of the concentration of the miscellaneous gas in the gas sealed container 1a.
The outputs of the two sensors change almost in the same way, but when the concentration of decomposed gas changes rapidly due to a ground fault, the gas sensor 1
The extreme gas diffusion to 1a 'is extremely disturbed by the diffusion port 25a', the gas sensor 11a responds first, and the gas sensor 11a 'shows a gradual sensor output with a delay.
In this way, the output difference between the gas sensors 11a and 11a 'is detected by the differential amplifier 17, and it is possible to detect an abnormality that does not depend on the concentration of the miscellaneous gas.

Eleventh Embodiment In the fourth and ninth embodiments, a gas valve is provided in the gas pipe section between one gas sensor and the gas sealed container for the two sensors attached to the gas sealed container to create a difference in concentration of decomposed gas at the time of a ground fault. ,
We have performed detection with the effect of the concentration of miscellaneous gases removed.
At this time, the gas valve is closed by the signal of the occurrence of the ground fault to prevent the decomposed gas from diffusing into the sensor inclusion portion 12b, so that the difference in the decomposed gas concentrations generated in the two sensor inclusion portions can be maintained for a long time. You can

FIG. 13 shows the configuration of the abnormality detecting device according to this embodiment. In the figure, 20 is a GIS accident detection signal. When a ground fault (or short circuit) accident occurs inside the GIS, there is a separate protection relay 20a that detects the presence or absence of the ground fault. This protection relay 20a
When there is an accident detection signal output 20 from, the opened gas valve 15 is automatically closed. Before the accident occurred, the sensor inclusions 12a and 12a 'had similar similar gas concentrations, but at the same time as the accident occurred, the sensor inclusions 12a' were completely blocked from spreading the decomposition gas due to a ground fault. The respective concentration differences are maintained for a long time. As a result, the density difference can be seen even when a certain amount of time has passed regardless of the detection timing.

Twelfth Embodiment In the eleventh embodiment, the accident detection signal from the GIS protection relay is applied to the valve operation signal, but by using this accident detection signal as a signal to turn on the power of the sensor signal processing device, measurement at the minimum necessary time is possible. Becomes

FIG. 14 shows the configuration of the abnormality detecting device according to this embodiment. In the figure, 20 is a GIS accident detection signal. When a ground fault (or short circuit) accident occurs inside the GIS, the sensor signal processing device 16 is powered on by the accident detection signal output 20 from the protection relay 20a that detects the ground fault accident, and measurement is started. As a result, it is not necessary to operate the sensor signal processing device 16 at all times, and it is possible to reliably detect when detection is necessary.

[0056]

Abnormality detection device according to this invention exhibits, in the abnormality detecting apparatus for detecting the gas sensor abnormality gas generated by the internal abnormality of the gas-insulated electrical equipment, gas space filled with insulating gas of the gas-insulated electric device A plurality of gas sensors which are independently arranged on a sealed container and are spaced apart from each other along the diffusion direction of the abnormal gas in the gas space; and a measuring means for measuring an output difference between the two gas sensors among the plurality of gas sensors. Since it is provided with the above, there is an effect that the generation of abnormal gas can be detected with high sensitivity regardless of the presence of miscellaneous gas in the sealed container.

[0057] abnormality detecting apparatus according to the invention of this is a plurality of gas sensors, by arranging the respective upper and lower sealed container can be detected effectively abnormal gas by convection effect of the abnormal gas sealed vessel There is an effect.

[0058] abnormality detecting apparatus according to the invention of this is a plurality of gas sensors, by spaced in the longitudinal direction of the sealed container, the density difference of the abnormal gas make the deviation of the gas diffusion travel times for each gas sensor There is an effect that the generation of abnormal gas can be detected remarkably and with high sensitivity.

[0059] abnormality detecting apparatus according to the invention of this is to be branched from the sealed container gas pipe which is a pipe, by spaced a gas sensor with a plurality of branched gas pipe,
Since a plurality of gas sensors can be installed with a single gas pipe from the sealed container, there is an effect that the piping work becomes easy.

[0060] abnormality detecting apparatus according to the invention of this is, with different length of the gas pipe which is plumbed to the gas sensors, by varying the diffusion movement time of abnormal gas to one of the gas sensor, the gas sensor with a simple structure There is an effect that the generation of abnormal gas can be detected with high sensitivity by making a difference in the inflow amount of abnormal gas between the two.

[0061] abnormality detecting apparatus according to the invention of this is the middle narrowed portion of the gas pipe which is plumbed to the gas sensors with different diameters is provided, by varying the diffusion movement time of abnormal gas to one of the gas sensor, There is an effect that the abnormal gas inflow amount is made different between the gas sensors with a simple configuration and the generation of the abnormal gas can be detected with high sensitivity.

[0062] abnormality detecting apparatus according to the invention of this is an on-off valve provided in the middle of the gas pipe which is plumbed to the gas sensors, by limiting the diffusion of the abnormal gas to one gas sensor, abnormal gas inlet between the gas sensor There is an effect that the difference in the amount can be increased and the generation of the abnormal gas can be detected with higher sensitivity, and the gas concentration difference between the gas sensors can be maintained for a long time by closing the on-off valve.

[0063] abnormality detection device according to this invention, branched from a sealed vessel with different diameter aperture portion provided in the middle of the pipe gas pipe, varying the diffusion movement time of abnormal gas to one gas sensor As a result, there is an effect that the abnormal gas inflow amount can be made different between the gas sensors with a simple configuration and the generation of the abnormal gas can be detected with high sensitivity.

[0064] abnormality detecting apparatus according to the invention of this is an on-off valve provided in the middle of the branches from the sealed container gas pipe which is a pipe, by limiting the diffusion of the abnormal gas to one gas sensor, between each gas sensor There is an effect that the difference in the inflow amount of the abnormal gas can be increased and the generation of the abnormal gas can be detected with higher sensitivity, and the gas concentration difference between the gas sensors can be maintained for a long time by closing the opening / closing valve.

[0065] abnormality detecting apparatus according to the invention of this is to place a plurality of gas sensors as well as arranged on the same sensor contained sections, these gas sensors in each room of the gas inflow is provided with an opening portion of the different kind of diameter Therefore, there is an effect that a difference in the inflow amount of the abnormal gas between the gas sensors can be made with a simpler configuration, and the generation of the abnormal gas can be detected with high sensitivity.

[0066] abnormality detecting apparatus according to the invention of this, in the abnormality detecting apparatus for detecting the gas sensor abnormality gas generated by the internal abnormality of the gas-insulated electrical equipment, gas adjacent sealed insulating gas in the gas-insulated electric device Space
By providing a plurality of gas sensors spaced apart along the diffusion direction of the abnormal gas and a measuring means for measuring the output difference of the two gas sensors among the plurality of gas sensors in the communication gas pipe connecting the sealed containers so as to be continuous The effect is that abnormal gas in each sealed container can be detected.

[0067] abnormality detecting apparatus according to the invention of this is a throttle portion for adjusting the gas flow rate in the middle of the communication gas pipe is provided, by varying the diffusion movement time of abnormal gas to one of the gas sensors, each with a simple structure There is an effect that the generation of abnormal gas can be detected with high sensitivity by making a difference in the abnormal gas inflow amount between the gas sensors.

[0068] abnormality detecting apparatus according to the invention of this is an on-off valve provided in the middle of the communication gas pipe, by limiting the diffusion of the abnormal gas to one gas sensor, increase the difference in abnormal gas inflow among the gas sensors However, there is an effect that the generation of abnormal gas can be detected with higher sensitivity and the difference in gas concentration between the gas sensors can be maintained for a long time by closing the on-off valve.

[0069] abnormality detection device according to this invention comprises a failure detecting means for detecting an abnormality occurring in the current path of the gas space installed gas sensor at a predetermined block unit, is installed in the pipe section by the signal of the failure detecting means Since the control means for closing the open / close valve is provided, it is possible to create a difference in concentration of abnormal gas between the sensors when a failure is detected and maintain the difference in concentration even after a predetermined time has elapsed.

[0070] abnormality detection device according to this invention comprises a failure detecting means for detecting an abnormality occurring in the current path of the gas space installed gas sensor at a predetermined block unit, to operate the instrument by a signal of the failure detecting means Since the control means is provided, there is an effect that the abnormal gas can be measured at the minimum required time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an abnormality detection device according to a first embodiment of the present invention.

FIG. 2 is an output characteristic of the sensor according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of an abnormality detection device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of an abnormality detection device according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of an abnormality detection device according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of an abnormality detection device according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of an abnormality detection device according to a sixth embodiment of the present invention.

FIG. 8 is an output characteristic of the sensor according to the sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of an abnormality detection device according to a seventh embodiment of the present invention.

FIG. 10 is a configuration diagram of an abnormality detecting device according to an eighth embodiment of the present invention.

FIG. 11 is a configuration diagram of an abnormality detection device according to a ninth embodiment of the present invention.

FIG. 12 is a configuration diagram of an abnormality detection device according to a tenth embodiment of the present invention.

FIG. 13 is a configuration diagram of an abnormality detection device according to an eleventh embodiment of the present invention.

FIG. 14 is a configuration diagram of an abnormality detection device according to a twelfth embodiment of the present invention.

FIG. 15 is a configuration diagram of an abnormality detection device of a conventional invention.

[Explanation of symbols]

1, 1a, 1b Gas sealed container, 2 Spacer, 3 Central conductor, 4 Ground fault occurrence point, 11a, 11b, 11a '
Sensor, 12a, 12b, 12a 'Sensor inclusion part, 13a, 13b, 13a' Gas pipe, 14
Throttle section, 15 valves, 16 sensor signal processing device, 1
7 differential amplifier, 18 processing unit, 20 accident detection signal, 24 communication gas pipe, 25a, 25a 'gas diffusion port, 30a, 30b, 30a' decomposition gas concentration,
31a, b Difference between sensor outputs.

Claims (17)

(57) [Claims] 1. A device for detecting abnormality detected by the gas sensor abnormality gas generated by the internal abnormality of the gas-insulated electric device, in the gas insulated electrical sealed on the container a gas space of the insulating gas sealed in the device independent, the gas An abnormality detection device comprising: a plurality of gas sensors spaced apart along the direction of diffusion of an abnormal gas in a space; and a measuring unit that measures an output difference between two gas sensors among the plurality of gas sensors. 2. The abnormality detection device according to claim 1, wherein a plurality of gas sensors are arranged above and below the sealed container. 3. The abnormality detection device according to claim 1, wherein a plurality of gas sensors are arranged separately in the longitudinal direction of the hermetically sealed container. 4. The abnormality detecting device according to claim 1, wherein a gas sensor is arranged at a distance from a gas pipe branched from a hermetically sealed container by a plurality of branched gas pipes. 5. The abnormality according to any one of claims 2 to 4, characterized in that the length of the gas pipes connected to each gas sensor is made different, and the diffusion transfer time of the abnormal gas to one gas sensor is made different. Detection device. 6. A gas pipe connected to each gas sensor is provided with a throttle part in the middle thereof to have a different diameter so that the time of diffusion and movement of the abnormal gas to one of the gas sensors is made different. The abnormality detection device according to any one of claims. 7. The abnormality detection according to claim 2, wherein an on-off valve is provided in the middle of the gas pipe connected to each gas sensor to limit the diffusion of the abnormal gas to one of the gas sensors. apparatus. 8. A gas pipe diverging from a hermetically sealed container is provided with a throttle part in the middle thereof to make the diameter different so that the diffusion time of the abnormal gas to one gas sensor is made different. The abnormality detection device described in. 9. The abnormality detection device according to claim 4, wherein an on-off valve is provided in the middle of the gas pipe branched from the sealed container to limit the diffusion of the abnormal gas to one of the gas sensors. 10. A plurality of gas sensors are arranged in the same sensor-containing portion, and these gas sensors are arranged in each room provided with openings having diameters such that the gas inflow amounts are different. 4. The abnormality detection device according to 4. 11. An abnormality detection device for detecting an abnormal gas generated by an internal abnormality of a gas-insulated electric device by a gas sensor, the sealed gas being filled with the insulating gas of the gas-insulated electric device so that adjacent gas spaces are continuous. In the communication gas pipe connecting the plurality of gas sensors spaced apart along the diffusion direction of the abnormal gas, among these gas sensors,
An abnormality detection device comprising a measuring means for measuring an output difference between two gas sensors. 12. A throttle part for adjusting a gas flow rate is provided in the middle of the communicating gas pipe, and the diffusion transfer time of the abnormal gas to one of the gas sensors is made different.
The abnormality detection device according to 1. 13. An on-off valve is provided in the middle of the communication gas pipe,
The abnormality detection device according to claim 11, wherein diffusion of the abnormal gas to one of the gas sensors is limited. 14. A failure detecting means for detecting an abnormality occurring in a predetermined block unit in a current path of a gas space in which a gas sensor is installed, and a control means for closing an on-off valve installed in a pipe part by a signal of the failure detecting means. The abnormality detection device according to any one of claims 7, 9 and 13, further comprising: 15. A fault detecting means for detecting an abnormality occurring in a current path of a gas space in which a gas sensor is installed in a predetermined block unit, and a control means for operating a measuring instrument in response to a signal from the fault detecting means. The abnormality detection device according to any one of claims 1 to 14, which is characterized in that. 16. The gas sensor is configured to measure the concentration of a specific gas.
Is detected, any one of claims 1 to 15 is characterized.
The abnormality detection device according to claim 1. 17. The gas sensor is sulfur hexafluoride gas.
Claim, characterized in that for detecting the concentration of the decomposition gas of 1
The abnormality detection device according to any one of claims 1 to 16.