JP3140917B2 - Gas leak monitoring device for closed containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas in a closed container, for example, in a gas-insulated electric device using a closed container filled with an insulating gas, for monitoring a gas leak in the closed container and issuing a warning of the gas leak. The present invention relates to a leak monitoring device.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional gas-insulated electric device for monitoring gas leakage of a closed container filled with an insulating gas. In FIG. 4, 1 is SF6 inside.
A sealed container filled with an insulating gas such as (sulfur hexafluoride) gas and containing a bus bar and / or a switchgear 2 to which a high voltage is applied. The sealed container 1 is a gas leakage monitoring target. is there.

A bellows 3 has one end communicating with the closed container 1 and expands and contracts in response to the gas pressure in the closed container 1.
Is another auxiliary closed container arranged in the vicinity of the closed container 1, and is filled with a gas of the same type as the gas filled in the closed container 1. 5 is a bellows whose one end communicates with the another closed container 4 and which expands and contracts in response to the gas pressure in the another closed container 4, 6 connects the free ends of the both bellows 3 and 5, A connecting rod 7 which moves in response to the expansion and contraction of the bellows 3, 5 is a position detecting means for outputting an output signal 7A when the moving amount of the connecting rod 6 becomes a predetermined value or more. The position of the connecting rod 6 is detected by a microswitch or a position sensor. Also, 8
Is a support frame for supporting the bellows 3, 5 and the position detecting means 7, and the bellows 3, 5; the connecting rod 6, the position detecting means 7, and the support frame 8 make the pressure difference responding means 9 It is configured.

Reference numeral 10 denotes a contact for closing a circuit in response to the output signal 7A, and reference numeral 11 denotes a control power supply 1 via the contact 10.
Alarm means connected to 2A and 12B.

Next, the operation of the above conventional device will be described. In a so-called steady state in which no gas leak occurs in the closed container 1 or there is a gas leak but the gas leak is equal to or less than a predetermined amount, since there is no or small pressure difference between the two closed containers 1 and 4, both bellows 3 and 5 and the articulation bar 6 are kept in the range of the stationary position. Accordingly, since the moving amount of the connecting rod 6 is equal to or less than the predetermined value, the output signal 7A is not output, so that the contact 10 is not closed and the alarm means 11 does not operate.

In an abnormal state in which a gas leak of a predetermined amount or more has occurred in the closed container 1, the pressure in the closed container 1 becomes lower than the pressure in another closed container 4. A pressure difference is generated, and the bellows 3, 5 expand and contract in response to the pressure difference, and the connecting rod 6 moves in the direction of the bellows 3 communicating with the closed container 1. When the moving amount of the connecting rod 6 becomes equal to or more than a predetermined value, the output signal 7A is output, the contact 10 is closed, and the control power supplies 12A and 12B are supplied.
The alarm means 11 operates to output an alarm for gas leakage.

For example, when the gas leak monitoring device is applied to a gas insulated electric device, an abnormal state in which a gas leak has occurred in the closed container 1 will be described. The condition under which a gas leak occurs in the closed container 1 and the alarm means 11 is activated is generally that when the gas in the closed container 1 leaks by 10% and the gas pressure in the closed container 1 decreases by 10%. It has been set. In addition, since the rated gas pressure of the gas-insulated electrical equipment is generally 0.5 MPa (megapascal, the same applies hereinafter), 10% of the gas in the closed container 1 leaks and the gas pressure in the closed container 1 is reduced. Is reduced by 10%, the pressure difference between the two closed containers 1 and 4 becomes 0.05 MPa. At this time, the bellows 3 and 5 expand and contract in response to a pressure difference of 0.05 MPa between the closed containers 1 and 4, and further, the connecting rod 6 becomes 0.05M.
It moves in the direction of the bellows 3 communicating with the closed container 1 by an amount corresponding to Pa. Therefore, the moving amount of the connecting rod 6 is 0.05
When the pressure becomes equal to or higher than MPa, the output signal 7A is output by the pressure difference responding means 9, the contacts 10 are closed, the control power supplies 12A and 12B are supplied, and the alarm means 11 is activated to output an alarm for gas leakage. You.

[0008]

The conventional gas leak monitoring device is constructed as described above, so that both closed containers 1 and 2 are used.
When the temperature difference occurred in the sample No. 4, there were the following problems. For example, if the temperature of only the other closed container 4 rises due to an increase in the temperature around the two closed containers 1 and 4 or irradiation of direct sunlight, the pressure in the other closed container 4 increases. Therefore, the connecting rod 6 moves in the direction of the bellows 3 communicating with the closed container 1 in the same manner as when a pressure difference is generated between the two closed containers 1 and 4 and a gas leak occurs in the closed container 1. I do. At this time, if the moving amount of the connecting rod 6 exceeds a predetermined value, the output signal 7A is output from the pressure difference responding means 9, so that the warning means 11 operates erroneously and a gas leak warning is issued. There was a problem that was output.

For example, in the gas-insulated electric equipment, the condition that the alarm means 11 operates is that 10% of the gas in the closed container 1 leaks and the pressure difference between the two closed containers 1 and 4 becomes 0. It is set when it becomes 05 MPa. Therefore, even when there is no gas leakage, when the temperature difference between the two closed containers 1 and 4 becomes about 20 ° C., the pressure difference between the two closed containers 1 and 4 becomes 0.05 MPa.
There is a problem that the alarm 1 is output erroneously and a gas leak alarm is output.

[0010] If the another closed container 4 can be installed inside the closed container 1 or adjacent to the closed container 1, the problem that a temperature difference occurs between the two closed containers 1 and 4 does not occur. However, it is necessary to install the pressure difference responding means 9 at a position of 1 to 2 m from the ground surface for maintenance and inspection, and it is not necessary to process the closed vessel 1 to install it inside the closed vessel 1. Therefore, it is necessary to install the closed container 1 at a position slightly away from the closed container 1 because it is difficult from the viewpoint of reliability. In this case, the temperature inside the small closed container 4 having a small volume easily rises due to an increase in the ambient temperature of the two closed containers 1 and 4 or irradiation of direct sunlight, but the large closed container 1 has a large volume.
The temperature rise rate in the inside becomes slow. Therefore, there is a problem that a pressure difference occurs between the two sealed containers 1 and 4 due to a temperature difference between the two sealed containers 1 and 4, and the alarm means 11 is erroneously operated to output a gas leak alarm. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a difference occurs between the temperature in a closed vessel for monitoring gas leakage and the temperature in another auxiliary closed vessel. An object of the present invention is to provide a gas leak monitoring device for a sealed container which can prevent an erroneous gas leak alarm from being output even when the gas leak occurs.

[0012]

According to the present invention, there is provided an apparatus for monitoring gas leakage of a closed container, comprising: an alarm device which is activated when a pressure difference responding device responds to a pressure difference between two closed containers; A temperature difference responsive means for disabling the operation of the alarm means in response to a temperature difference in the inside is provided.

Further, the pressure difference responding means which responds to the pressure difference between the two closed containers is responsive to the first and second pressure differences, and the first and second pressure difference responding means are respectively operated at the time of the first and second pressure difference response. A first alarm means and a second alarm means, and a temperature difference responding means for disabling the operation of the first alarm means in response to a temperature difference between the two sealed containers are provided.

Further, the temperature in the closed container is measured at a plurality of locations, and the average value is used as the temperature in the closed container.

[0015]

According to the gas leak monitoring device for a closed container according to the present invention, the temperature difference responsive means is actuated when the temperature difference between the two closed containers is equal to or more than a predetermined value, and an alarm is issued when the temperature difference responsive means is actuated. The operation of the means was invalidated to prevent false alarms from being output.

In addition, the operation of the first alarm means of the first alarm means and the second alarm means responsive to the pressure difference between the two sealed containers is invalidated when the temperature difference responsive means is activated, thereby causing an erroneous operation. Not to output the alarm
The alarm means outputs an alarm even when the temperature difference between the two closed containers is large.

Further, by measuring the temperature in the closed vessel at a plurality of locations and setting the average value as the temperature in the closed vessel, more accurate monitoring of gas leakage in the closed vessel can be realized.

[0018]

【Example】

Embodiment 1 FIG. FIG. 1 is a configuration diagram showing an embodiment of a gas leak monitoring device for a closed container according to the present invention. In FIG.
Reference numerals 1 to 11, 7A, 12A, and 12B are the same as those of the above-described conventional device, and a description thereof will be omitted. 1A is a closed container 1
Temperature sensor for measuring the temperature in the inside, 4A is a temperature sensor for measuring the temperature in another auxiliary closed container 4, and 13 is a temperature difference obtained from the temperatures measured by both temperature sensors 1A and 4A. The temperature difference responsive means 14 for outputting the output signal 13A when the above is reached is a contact for opening the circuit in response to the output signal 13A, and is connected in series with the contact 10.

In FIG. 1, when there is no temperature difference between the two sealed containers 1, 4, the temperature difference responding means 13 outputs the output signal 13A.
Is not output, and the contact 14 remains closed. Therefore, in a so-called steady state in which no gas leak has occurred in the closed container 1 or there is a gas leak which is equal to or less than a predetermined amount, the output signal 7A is not output as in the conventional device, and the contact 10 is closed. The alarm means 11 does not operate.
Conversely, in an abnormal state in which a gas leak of a predetermined amount or more has occurred in the sealed container 1, an output signal 7A is output in the same manner as in the conventional device, so that the contact 10 is closed and the alarm means 11 is activated to alarm the gas leak. Is output.

Next, when a temperature difference occurs between the closed containers 1 and 4, the temperature in the closed containers 1 and 4 is increased by, for example, an increase in the temperature around the closed containers 1 and 4 or irradiation of direct sunlight. When the pressure difference caused by the difference becomes equal to or more than a predetermined value at which the alarm means 11 is activated due to gas leakage of the sealed container 1, the output signal 7A is output, so that the contact 10 is closed and the alarm means 11 is activated. And However, at this time, the temperature difference responding means 13 outputs the output signal 13A in response to the temperature difference between the two closed containers 1 and 4, and the contact 14 is opened in response to the output signal 13A. 10
Alarm means 11 is controlled by control power supplies 12A, 12B
Not connected to That is, the operation of the alarm means 11 is invalidated in response to the temperature difference between the two sealed containers 1 and 4, so that an erroneous alarm of gas leakage due to the temperature difference is not issued.

For example, in the gas insulated electric equipment, the condition under which the pressure difference responding means 9 responds is that 10% of the gas in the closed vessel 1 leaks and the pressure difference between the two closed vessels 1, 4 becomes It is set when it becomes 0.05 MPa. Therefore, even when there is no gas leak in the closed container 1, when the temperature difference between the two closed containers 1 and 4 becomes about 20 ° C., the pressure difference between the two closed containers 1 and 4 becomes 0.05 MPa. The pressure difference responding means 9 responds to output the output signal 7A and the contact 10 is closed. At this time, before the temperature difference between the two closed containers 1 and 4 becomes about 20 ° C. and the pressure difference responding means 9 responds and the contact 10 is closed, the temperature difference responding means 13
Responds to the temperature difference between the two closed containers 1 and 4 to open the contact 14 and invalidate the operation of the alarm means 11, so that an erroneous gas leak alarm due to the temperature difference is not output.

Embodiment 2 FIG. As described above, according to the first embodiment, a malfunction due to a temperature difference can be prevented. However, even if a gas leak of a predetermined value or more in the closed container 1 and a temperature difference of a predetermined value or more in the two closed containers 1 and 4 overlap each other, a warning is issued even though it is a rare case to output a warning. A new problem arises that cannot output. FIG. 2 is a block diagram showing a second embodiment according to the present invention for solving this new problem. The pressure difference responding means 9 outputs an output signal 7A responding to a first pressure difference.
Apart from this, an output signal 7B responding to the second pressure difference larger than this is output, and the output signal 7A responding to the first pressure difference is output by a temperature-compensated alarm means as in the first embodiment. 11 is used to control the operation circuit. Reference numeral 15 denotes a contact for closing a circuit in response to the output signal 7B in response to the second pressure difference, and reference numeral 16 denotes second alarm means connected to the control power supplies 12A and 12B via the contact 15.

As in the first embodiment, for example, in the gas insulated electric equipment, the condition that the pressure difference responding means 9 responds is that 10% of the gas in the container leaks from the closed container 1, It is set when the pressure difference in 4 becomes 0.05 MPa. Therefore, even when there is no gas leakage, when the temperature difference between the two sealed containers 1 and 4 becomes about 20 ° C., the pressure difference between the two sealed containers 1 and 4 becomes 0.05 MPa. In response to the means 9, the output signal 7A
Is output and the contact 10 is closed. However, since the temperature difference between the two closed vessels 1 and 4 is about 20 degrees, before the contact 10 is closed by the reaction of the pressure difference responding means 9, the temperature difference responsive means 13 is closed by the two closed vessels 1 and 4. In response to the temperature difference in the container 4, an output signal 13A is output, and the contact 14 is opened to invalidate the operation of the alarm means 11. Will not be issued.

Assuming that 10% of the gas leaks from the closed containers 1 and 4 with no temperature difference between the closed containers 1 and 4, the pressure difference between the closed containers 1 and 4 becomes 0.05 MPa and the output signal 7A Since the contact 10 is closed and there is no temperature difference between the two closed containers 1 and 4, the contact 14 is not opened, so that the first alarm means 11 is activated, for example, to issue a gas supply command. Next, assume that a large amount of gas leakage occurs. For example, assuming that 20% of the gas leaks from the closed container 1, both closed containers 1
The pressure difference in 4 becomes 0.1 MPa, and the pressure difference responding means 9 outputs the output signal 7B to close the contact 15. This contact 1
The closing of 5 activates the second alarm means 16 and issues a command to lock the operation of the switchgear 2, for example. The operation of the opening and closing device 2 is locked in order to suppress the occurrence of a serious accident such as inability to shut off the operation of the opening and closing device 2 when the gas leakage from the closed container 1 is large.

It is conceivable that the second alarm means 16 malfunctions due to the temperature difference between the two closed containers 1 and 4, but the pressure difference of 0.1 MPa between the two closed containers 1 and 4 is converted into a temperature difference of 40 ° C. This situation is considerable, and there is no problem because the appearance of this situation due to an increase in the temperature around the two closed containers 1 and 4 or irradiation with direct sunlight is not considered. In other words, the second alarm means 16 can always monitor gas leaks in the sealed container 1 irrespective of temperature conditions, as a critical alarm that locks the operation of the switchgear 2 and the like. Furthermore, even if there is a temperature difference between the two closed containers 1 and 4, a highly safe closed container gas leak monitoring device capable of always monitoring gas leak of the closed container 1 can be obtained.

Embodiment 3 FIG. FIG. 3 is a block diagram showing a third embodiment according to the present invention. The temperature in the closed vessel 1 is measured by a plurality of temperature sensors 1A and 1B provided at distant locations, and the average value is measured for the closed section. The temperature in the container 1 is set. The temperature difference responsive means 13 outputs an output signal 13A and outputs an erroneous gas leak alarm when the temperature difference between the average value and the temperature in another auxiliary closed container 4 becomes a predetermined value or more. Do not let it.

According to the third embodiment, the measurement error of the temperature inside the closed container 1 due to the irradiation of the closed container 1 with direct sunlight or the difference in the ambient temperature at the place where the closed container 1 is installed is reduced.
Although the temperature difference between the two closed containers 1 and 4 is equal to or less than a predetermined value, the temperature difference responding means 13 responds to the temperature difference between the two closed containers 1 and 4 to open the contact 14 and open the alarm means 11. Can be prevented from being invalidated, and a gas leak alarm is not output.

In the third embodiment, the temperature sensor 1A,
Although the number of the temperature sensors 1A and 1B for measuring the temperature in the closed container 1 is increased to two or more, the measurement error of the temperature in the closed container 1 can be further reduced. Needless to say.

Further, in each of the above embodiments, the case where the present invention is applied to the gas insulated electric device in which the insulating gas is filled in the closed container 1 has been described. However, the present invention is not limited to this application. The same effects as those of the above-described embodiments can be obtained even when the present invention is applied to a gas leak monitoring device for a sealed container filled with any gas including air without selecting a gas to be performed.

In each of the above embodiments, the main closed container 1 and the secondary closed container 4 have been described. However, both of the closed containers 1 and 4 are used as the main closed containers, and gas leakage is performed. May be used as an airtight container, and the same effects as in the above embodiments can be obtained.

[0031]

As described above, according to the present invention, there is provided a temperature difference responding means for responding to a temperature difference between two closed containers,
Since the operation of the alarm means is invalidated by the output, it is possible to prevent an erroneous alarm from being output due to a temperature difference between the two sealed containers.

Further, according to the present invention, the pressure difference responding means which responds to the pressure difference between the two sealed containers responds to the first and second pressure differences, and the first and second pressure difference responding means are provided. The first and second alarm means which are activated at the time are provided, and the operation of the first alarm means is invalidated when the temperature difference response means responds. When the pressure is not output and the pressure difference between the two closed containers is large, the second alarm means can be activated regardless of the temperature difference.

Further, according to the present invention, the temperature in the closed vessel is measured at a plurality of locations, and the average value is taken as the temperature in the closed vessel, so that the temperature difference between the two closed vessels can be measured more accurately. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a gas leak monitoring device for a sealed container according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a configuration diagram showing still another embodiment of the present invention.

FIG. 4 is a configuration diagram showing a conventional gas leak monitoring device for a closed container.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Closed container, 1A, 1B temperature sensor, 3 bellows, 4 another closed container, 4A temperature sensor, 5 bellows, 7 position detecting means, 9 pressure difference responding means, 10 contacts, 11 first alarm means, 12A, 12B Control power supply, 13 Temperature difference responding means, 14, 15 contacts, 16
Second alarm means.

Claims (3)

(57) [Claims] 1. An airtight container disposed in the vicinity of a gas-filled airtight container, a pressure difference responsive means responsive to a pressure difference between the two closed containers, and an alarm activated when the pressure differential responsive means is responsive. Means, and a temperature difference responsive means responsive to a temperature difference between the two closed containers, wherein the operation of the alarm means is invalidated when the temperature difference responsive means responds. Leak monitoring device. 2. A closed container arranged in the vicinity of a gas-filled closed container, pressure difference responsive means for responding to first and second pressure differences between the two closed containers, and pressure difference responsive means. First alarm means that is activated when the first pressure difference responds,
A second alarm means operable at the time of the second pressure differential response of the pressure differential responsive means; and a temperature differential responsive means responsive to a temperature difference between the two closed vessels, wherein the second element is activated when the temperature differential responsive means responds. A gas leak monitoring device for a sealed container, wherein the operation of the alarm means is invalidated. 3. The temperature in the closed vessel is measured at a plurality of locations,
The gas leak monitoring device for a closed container according to claim 1 or 2, wherein the average value of the temperatures at the plurality of locations is set as the temperature in the closed container.