Gas Pressure Control Device

Abstract

The gas pressure control device (100) has a control unit (30) that opens a first electronic valve (21) when the amount of gas lacking in a first gas compartment chamber (51a), in which the gas pressure of the enclosed insulating gas is less than a minimum guaranteed gas pressure, is equal to or greater than the amount of gas that can be supplied from a second gas compartment chamber (52a), in which the gas pressure of the enclosed insulating gas is different from that of the first gas compartment chamber (51a) and is equal to or greater than the minimum guaranteed gas pressure, and when the gas pressure of the second gas compartment chamber (52a) is equal to or greater than the gas pressure of the first gas compartment chamber (51a), closes the first electronic valve (21) before the gas pressure of the second gas compartment chamber (52a) becomes equal to or greater than the minimum guaranteed gas pressure of the second gas compartment chamber (52a).

Description

[Technical field]

[0001] The present disclosure relates to a gas pressure control device. [Background technology]

[0002] Conventionally, there is a gas pressure control device that is connected to a plurality of gas compartments and replenishes gas in the plurality of gas compartments so that the pressure in the plurality of gas compartments is constant. The gas compartment separation device described in Patent Document 1 is connected to the first gas compartment chamber and the second gas compartment chamber via a connection path. The gas compartment separation device communicates the first gas compartment chamber and the second gas compartment chamber when the pressure difference between the first gas compartment chamber and the second gas compartment chamber is relatively small. Gas flows between the first gas compartment chamber and the second gas compartment chamber through the gas compartment separation device. This makes the pressure in the first gas compartment chamber and the pressure in the second gas compartment chamber approximately the same. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 52-45020 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, the minimum gas pressure required in the multiple gas compartment chambers (hereinafter referred to as "minimum guaranteed gas pressure") may differ. For example, the minimum guaranteed gas pressure may differ depending on the equipment installed in the gas compartment chamber. For example, a busbar and a circuit breaker may be installed in the first gas compartment chamber. In this case, the minimum guaranteed gas pressure is 0.5 MPa (rated gas pressure is 0.6 MPa). Also, there is a case where only a busbar is installed in the second gas compartment chamber, and a circuit breaker is not installed. In this case, the minimum guaranteed gas pressure is 0.4 MPa (rated gas pressure is 0.5 MPa). In this case, the gas compartment separation device described in Patent Document 1 is used to communicate the two gas compartment chambers, and gas is caused to flow from the gas compartment chamber with the higher gas pressure to the gas compartment chamber with the lower gas pressure, so that the gas pressure in the gas compartment chamber with the higher minimum guaranteed gas pressure may become equal to or lower than the minimum guaranteed gas pressure of the gas compartment chamber.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a gas pressure control device that can maintain an appropriate gas pressure in each gas compartment, even if there are multiple gas compartments with different minimum guaranteed gas pressures. [Means for solving the problem]

[0006] The gas pressure control device according to the present disclosure includes a first gas pressure sensor that measures a first gas pressure, which is the pressure of an insulating gas sealed in a first gas chamber, a second gas pressure sensor that measures a second gas pressure, which is the pressure of an insulating gas sealed in a second gas chamber that is separated from the first gas chamber by a first partition member having an insulating member, a first electronic valve that is connected to the first gas chamber and the second gas chamber, a control unit that controls the opening and closing of the first electronic valve, and a second gas pressure sensor that measures a second gas pressure, which is the pressure of an insulating gas sealed in a second gas chamber that is separated from the first gas chamber by a first partition member having an insulating member. a memory unit that stores a first volume which is the volume of the gas chamber, a second volume which is the volume of the second gas chamber, a first minimum guaranteed gas pressure which is the lowest gas pressure to be filled in the first gas chamber, and a second minimum guaranteed gas pressure which is the lowest gas pressure to be filled in the second gas chamber and is different from the first minimum guaranteed gas pressure; and a control unit that acquires the first gas pressure from the first gas pressure sensor and the second gas pressure from the second gas pressure sensor and stores the first gas pressure and the second gas pressure in the memory unit. a first volume, a second volume, a first minimum guaranteed gas pressure, and a second minimum guaranteed gas pressure are acquired, a first differential pressure is calculated which is a difference between the first gas pressure and the first minimum guaranteed gas pressure, a second differential pressure is calculated which is a difference between the second gas pressure and the second minimum guaranteed gas pressure, and when the first differential pressure is less than 0 and the second differential pressure is 0 or more, a first gas shortage indicator is calculated using the first differential pressure and the first volume, the first gas shortage indicator being an indicator showing an amount of gas that is shortage in the first gas compartment. a first supplyable gas index which is an index showing the amount of gas that can be supplied from the second gas chamber to the first gas chamber, the first supplyable gas index being calculated using the second differential pressure and the second volume; if the sum of the first gas shortage index and the first supplyable gas index is 0 or more and the second gas pressure is 0 or more, the first electronic valve is opened; and if the first differential pressure becomes 0 or more after the first electronic valve is opened, the first electronic valve is closed before the second differential pressure becomes less than 0. Effect of the Invention

[0007] The gas pressure control device of the present disclosure supplies gas that can be supplied from a gas compartment chamber whose gas pressure is equal to or higher than the minimum guaranteed gas pressure and is full of gas when there are multiple gas compartment chambers with different minimum guaranteed gas pressures and when there is a gas compartment chamber whose gas pressure is below the minimum guaranteed gas pressure and is short of gas. This makes it possible to provide a gas pressure control device that can maintain an appropriate gas pressure in each gas compartment chamber even when there are multiple gas compartment chambers with different minimum guaranteed gas pressures. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a gas pressure control device according to a first embodiment. [Diagram 2] 4 is a table showing an example of pressure etc. of each gas chamber according to the first embodiment. [Diagram 3] 4 is a process flow of gas pressure control according to the first embodiment. [Figure 4] FIG. 11 is a cross-sectional view of a gas pressure control device according to a second embodiment. [Diagram 5] 13 is a table showing an example of pressure etc. of each gas compartment according to the second embodiment. [Figure 6] 11 is a process flow of gas pressure control according to the second embodiment. [Figure 7] FIG. 11 is a cross-sectional view of a gas pressure control device according to a third embodiment. [Figure 8] 13 is a table showing an example of pressure etc. of each gas compartment according to the third embodiment. [Figure 9] 13 is a process flow of gas pressure control according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Embodiment 1 The gas pressure control device in the first embodiment will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a cross-sectional view of the gas pressure control device according to the first embodiment. The gas pressure control device 100 includes a first gas pressure sensor 11, a second gas pressure sensor 12, a first electronic valve 21, a control unit 30, and a storage unit 40. The first gas pressure sensor 11, the second gas pressure sensor 12, and the first electronic valve 21, together with a first tank 51, a second tank 52, a third tank 53, a fourth tank 54, a first insulating spacer 61, a second insulating spacer 62, a third insulating spacer 63, a first busbar 71, a second busbar 72, and a first circuit breaker 81, constitute a part of a gas insulation device 200.

[0010] A first gas chamber 51a is formed in the internal space of the first tank 51. An insulating gas such as SF6 is sealed in the first gas chamber 51a (hereinafter, insulating gas is referred to as "gas"). A second gas chamber 52a is formed in the internal space of the second tank 52. Gas is sealed in the second gas chamber 52a. The first tank 51 and the second tank 52 are connected to a first insulating spacer 61. The first tank 51 and the second tank 52 are fixed with bolts in a manner that sandwiches the first insulating spacer 61. The first insulating spacer 61 serves as a first partition member that separates the first gas chamber 51a and the second gas chamber 52a.

[0011] The first tank 51 is connected to the third insulating spacer 63 together with the fourth tank 54 on the side opposite to the first insulating spacer 61. The first tank 51 and the fourth tank 54 are fixed with bolts in a manner sandwiching the third insulating spacer 63. The first insulating spacer 61 and the third insulating spacer 63 are connected to the first busbar 71 by conductive members provided in the center of each spacer.

[0012] The second tank 52 is connected to the second insulating spacer 62 together with the third tank 53 on the side opposite to the first insulating spacer 61. The second tank 52, the third tank 53, and the third insulating spacer 63 are fixed by bolts in a sandwiched manner. The first insulating spacer 61 and the second insulating spacer 62 are conductive members provided in the center of each, and hold the second busbar 72. The second busbar 72 is composed of multiple busbars with the first circuit breaker 81 in between.

[0013] A first pipe 110 is provided from the inner wall to the outer wall of the first tank 51. The first pipe 110 is connected to a first gas pressure sensor 11. The first gas pressure sensor 11 measures the gas pressure in the first gas compartment chamber 51a (hereinafter referred to as the "first gas pressure") through the first pipe 110. The first pipe 110 is also connected to a first electronic valve 21 by branching. A second pipe 120 is provided from the inner wall to the outer wall of the second tank 52. The second pipe 120 is connected to a second gas pressure sensor 12. The second gas pressure sensor 12 measures the gas pressure in the second gas compartment chamber 52 (hereinafter referred to as the "second gas pressure") through the second pipe 120. The second pipe 120 is also connected to the first electronic valve 21 by branching. Therefore, the first electronic valve 21 is connected via the first pipe 110 and the second pipe 120 to the first gas chamber 51a and the second gas chamber 52a.

[0014] The first electronic valve 21 has an internal valve that can be opened and closed, and a driving force such as a motor (not shown). The first electronic valve 21 activates the driving force in response to a signal from the control unit 30, and can open and close the valve.

[0015] The control unit 30 includes an arithmetic circuit such as a CPU (Central Processing Unit). The control unit 30 is connected to the first gas pressure sensor 11, the second gas pressure sensor 12, the first electronic valve 21, and the memory unit 40 via wired or wireless communication means such as a LAN cable. The control unit 30 and the memory unit 40 may be housed in an operation panel (not shown) of the gas insulated device 200 (not shown), or the gas insulated device 200 may be provided in a PC in a monitoring room.

[0016] The control unit 30 obtains a first gas pressure from the first gas pressure sensor 11. The control unit 30 obtains a second gas pressure from the second gas pressure sensor 12. The control unit 30 controls the opening and closing of the first electronic valve 21 based on the first gas pressure and the second gas pressure. When the first electronic valve 21 is opened, gas flows between the first gas chamber 51a and the second gas chamber 52a.

[0017] The storage unit 40 includes storage media such as a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, etc. The storage unit 40 stores the capacity of the first gas chamber (hereinafter referred to as the "first capacity"), the capacity of the second gas chamber (hereinafter referred to as the "second capacity"), the minimum gas pressure to be filled in the first gas chamber (hereinafter referred to as the "first minimum guaranteed gas pressure"), the minimum gas pressure to be filled in the second gas chamber (hereinafter referred to as the "second minimum guaranteed gas pressure"), and other information.

[0018] Next, an example of the pressure etc. of each gas chamber according to embodiment 1 will be shown. Fig. 2 is a table showing an example of the pressure etc. of each gas chamber according to embodiment 1.

[0019] As described above, the first busbar 71 is housed in the first gas chamber 51a. The first minimum guaranteed gas pressure is 0.4 MPa. The first capacity is 500 L (liters). The first gas pressure is 0.35 MPa. In this case, the first gas pressure - the first minimum guaranteed gas pressure = -0.05 MPa (hereinafter, the differential pressure between the first gas pressure and the first minimum guaranteed gas pressure is referred to as the "first differential pressure"). Since the first differential pressure is less than 0, the first gas pressure in the first gas chamber 51a does not reach the first minimum guaranteed gas pressure. Therefore, there is a shortage of gas in the first gas chamber 51a.

[0020] As described above, the second gas compartment chamber 52a houses the second busbar 72 and the first circuit breaker 81. The second minimum guaranteed gas pressure is 0.5 MPa. The second capacity is 400 L. The second gas pressure is 0.6 MPa. In this case, the second gas pressure - the second minimum guaranteed gas pressure = 0.1 MPa (hereinafter, the pressure difference between the second gas pressure and the second minimum guaranteed gas pressure is referred to as the "second differential pressure"). Since the second differential pressure is 0 or more, the second gas pressure in the second gas compartment chamber 52a is equal to or higher than the second minimum guaranteed gas pressure. Therefore, the second gas compartment chamber 52a is full of gas. Therefore, the subordinate gas can be supplied from the second gas compartment chamber 52a to the first gas compartment chamber 51a.

[0021] In the first gas chamber 51a and the second gas chamber 52a, the amount of gas that is insufficient or excessive is calculated based on the minimum guaranteed gas pressure of each chamber. Hereinafter, the amount of gas that is insufficient or excessive in a certain gas chamber is referred to as the "gas index." For a gas chamber whose gas index is less than 0, the amount of gas in that gas chamber is insufficient. In this case, the amount of gas that is insufficient to meet the minimum guaranteed gas pressure is referred to as the "gas index deficiency." On the other hand, for a gas chamber whose gas index is 0 or more, the amount of gas in that gas chamber is sufficient. In this case, the amount of gas that is sufficient for the minimum guaranteed gas pressure is referred to as the "gas index available for supply." In addition, when atmospheric pressure is used to calculate the gas index, the atmospheric pressure is assumed to be 0.1 MPa.

[0022] The gas index of the first gas chamber 51a is the capacity (L) of the first gas chamber × the first pressure difference (MPa) / atmospheric pressure (MPa) = -250L. Since it is a value less than 0, 250L of gas is insufficient in the first gas chamber 51a to achieve the first minimum guaranteed gas pressure. The amount of gas insufficient in the first gas chamber 51a is referred to as the "first gas shortage index". On the other hand, the gas index of the second gas chamber 52a is the capacity (L) of the second gas chamber × the second pressure difference (MPa) / atmospheric pressure (MPa) = 400L. Since it is a value equal to or greater than 0, 250L of gas is available to be supplied from the second gas chamber 52a to the other gas chamber (the first gas chamber 51a) for the second minimum guaranteed gas pressure. The gas index that can be supplied from the second gas chamber 52a is referred to as the "first supplyable gas index".

[0023] The second gas pressure is equal to or higher than the first gas pressure. Therefore, by opening the first electronic valve 21, it is possible to supply gas from the second gas chamber 52a to the first gas chamber 51a. In addition, the sum of the first gas shortage index and the first gas supply index is 150L, ​​which is equal to or higher than 0. Therefore, by flowing gas from the second gas chamber 52a to the first gas chamber 51a, it is possible for the first gas pressure to satisfy the minimum guaranteed gas pressure. When the first gas pressure satisfies the minimum guaranteed gas pressure, it is possible to maintain the first gas pressure and the second gas pressure at or higher than their respective minimum guaranteed gas pressures by closing the first electronic valve 21.

[0024] Next, a process in which the control unit 30 of the gas pressure control device 100 according to the first embodiment controls the opening and closing of the first electronic valve 21 will be described. Fig. 3 shows a process flow of gas pressure control performed by the control unit 30 according to the first embodiment. For ease of explanation, the flow is based on the assumption that the amount of gas in the first gas chamber 51a is insufficient and the amount of gas in the second gas chamber 52a is available, as in the example shown in Fig. 2. The process flow will also be explained using the values ​​of the example shown in Fig. 2 as appropriate.

[0025] The control unit 30 performs a process of acquiring the first gas pressure and the second gas pressure (step S101). That is, the control unit 30 acquires the first gas pressure via the first gas pressure sensor 11. Then, the control unit 30 acquires the second gas pressure via the second gas pressure sensor 12. In the example shown in Fig. 2, the first gas pressure is 0.35 MPa, and the second gas pressure is 0.6 MPa.

[0026] Next, the control unit 30 calculates the first differential pressure and the second differential pressure (step S102). Specifically, the control unit 30 acquires the first minimum guaranteed gas pressure and the second minimum guaranteed gas pressure from the memory unit 40. Then, the control unit 30 calculates the first differential pressure using the first gas pressure and the first minimum guaranteed gas pressure. Also, the control unit 30 calculates the second differential pressure using the second gas pressure and the second minimum guaranteed gas pressure. In the example shown in FIG. 2, the first minimum guaranteed gas pressure is 0.4 MPa, the second minimum guaranteed gas pressure is 0.5 MPa, the first differential pressure is -0.05 MPa, and the second differential pressure is 0.1 MPa.

[0027] Next, the control unit 30 judges whether or not there is an abnormality in either the first gas pressure or the second gas pressure using the first differential pressure or the second differential pressure (step S103). Specifically, if the first differential pressure is 0 or more, the control unit 30 judges that the first gas pressure is normal. That is, the gas in the first gas chamber 51a is sufficient for the first minimum guaranteed gas pressure. On the other hand, if the first differential pressure is less than 0, the control unit judges that there is an abnormality in the first gas pressure. That is, the gas in the first gas chamber 51a is insufficient for the first minimum guaranteed gas pressure. Similarly, if the second gas pressure is equal to or greater than the second minimum guaranteed gas pressure, the control unit 30 judges that there is no abnormality in the second gas pressure. That is, the gas in the second gas chamber 52a is sufficient for the second minimum guaranteed gas pressure. On the other hand, if the second gas pressure is less than the second minimum guaranteed gas pressure, the control unit determines that the second gas pressure is abnormal, i.e., that the gas in the second gas chamber 52a is insufficient for the second minimum guaranteed gas pressure.

[0028] If an abnormality occurs in either the first gas pressure or the second gas pressure, the process of step S103 is YES, and in other cases (either both are normal or both are abnormal), the process of step S103 is NO. In the example shown in FIG. 2, the first differential pressure is -0.05 MPa, and since the first differential pressure is less than 0, it is determined that the first gas pressure is abnormal and the gas in the first gas chamber 51a is insufficient. Also, the second differential pressure is 0.1 MPa, and since it is equal to or greater than 0, it is determined that the second gas pressure is normal and the gas in the second gas chamber 52a is sufficient. Therefore, in this case, the process of step S103 is YES.

[0029] Next, the case where the control unit 30 judges that one of the first gas pressure or the second gas pressure is abnormal in the judgment process of step S103 (step S103: YES) will be described. For convenience of explanation, the explanation will be given on the premise that the first differential pressure is less than 0 and gas is insufficient in the first gas compartment 51a, as in the example shown in FIG. 2. The control unit 30 calculates the first gas shortage index and the first supplyable gas index (step S104). Specifically, the control unit 30 acquires the first capacity and the second capacity from the storage unit 40. Then, the control unit 30 calculates the first gas shortage index and the first supplyable gas index using the first differential pressure, the first capacity, the second differential pressure, and the second capacity. In the example shown in FIG. 2, the first capacity is 500L, the second capacity is 400L, the first gas shortage index is −250L, and the first supplyable gas index is 400L.

[0030] Next, the control unit 30 judges whether the sum of the first gas shortage index and the first gas supply index is equal to or greater than 0 (step S105). This judges whether the second gas pressure is equal to or greater than the second minimum guaranteed gas pressure even if the second gas chamber 52a, which can supply gas, supplies the first gas chamber 51a, which is short of gas, with the amount of gas that makes up for the shortage when the first electronic valve 21 is opened. In the example shown in FIG. 2, the sum of the first gas shortage index and the first gas supply index is 150 L, which is equal to or greater than 0 (step S105: YES).

[0031] Next, when the control unit 30 judges in the process of step S105 that the sum of the first gas shortage index and the first gas supply index is equal to or greater than 0 (step S105: YES), it judges whether the gas pressure of the gas chamber to which gas can be supplied is equal to or greater than the gas pressure of the gas chamber in which gas is insufficient. That is, it judges whether the second gas pressure is equal to or greater than the first gas pressure (step S106). This judges whether gas can flow from the second gas chamber 52a to the first gas chamber 51a when the first electronic valve 21 is opened. According to the example shown in FIG. 2, the first gas pressure is 0.35 MPa, and the second gas pressure is 0.5 MPa. Therefore, in this case, the second gas pressure is equal to or greater than the first gas pressure (step S106: YES).

[0032] Next, when the control unit 30 determines in the process of step S106 that the second gas pressure is equal to or higher than the first gas pressure (step S106: YES), it opens the first electronic valve (step S107). After the valve is opened, gas flows from the second gas chamber 52a, which can supply gas, to the first gas chamber 51a, which is short of gas. If the first gas pressure becomes equal to or higher than the first minimum guaranteed gas pressure, the first gas pressure becomes appropriate. In other words, the first gas chamber 51a is filled with gas.

[0033] Next, when the first differential pressure is equal to or greater than 0, the control unit 30 closes the first electronic valve 21 before the second differential pressure becomes less than 0 (step S108). When the first differential pressure is equal to or greater than 0, that is, when the first gas pressure becomes equal to or greater than the first minimum guaranteed gas pressure, the first gas chamber 51a is filled with gas. In addition, before the second differential pressure becomes less than 0, that is, before the second gas pressure becomes less than the second minimum guaranteed gas pressure, the supply of gas from the second gas chamber 52a to the first gas chamber 51a is stopped, thereby preventing a situation in which gas is insufficient in the second gas chamber 52a. Thus, both the first gas pressure and the second gas pressure become equal to or greater than the minimum guaranteed gas pressure. Thus, appropriate gas pressures can be maintained in the multiple gas chambers (the first gas chamber 51a and the second gas chamber 52a) having different minimum guaranteed gas pressures.

[0034] When the control unit 30 determines that there is no abnormality in both the first gas pressure and the second gas pressure in the determination process of step S103 (step S103: NO), the control unit 30 ends the process because there is no abnormality in both the first gas chamber 51a and the second gas chamber 52a, and there is no need to open the first electronic valve 21.

[0035] Moreover, when the control unit 30 judges in the judgment process of step S105 that the sum of the first gas shortage index and the first gas supply index is less than 0 (step S105: NO), the control unit 30 ends the process. This is because, even if the first electronic valve 21 is opened, the amount of gas for making the first gas pressure equal to or greater than the first minimum guaranteed gas pressure cannot be supplied from the second gas chamber 52a to the first gas chamber 51a. Moreover, when the control unit 30 judges in the judgment process of step S106 that the first gas pressure is higher than the second gas pressure (step S106: NO), the control unit 30 ends the process. This is because, even if the first electronic valve 21 is opened, gas does not flow from the second gas chamber 52a to the first gas chamber 51a. In these cases, a notification unit such as a display or a buzzer (not shown) may notify the manager of the gas insulation device 200 that inspection and maintenance are required.

[0036] As described above, the gas pressure control device 100 according to the first embodiment opens the first electronic valve 21 if the sum of the first gas shortage index and the first supplyable gas index is 0 or more and the second gas pressure is the first gas pressure or more. Then, if the first differential pressure becomes 0 or more after the first electronic valve 21 is opened, the first electronic valve 21 is closed before the second differential pressure becomes less than 0. This makes it possible to maintain an appropriate gas pressure in each gas compartment even if the minimum guaranteed gas pressures are different in the multiple gas compartments.

[0037] In the first embodiment, when the first electronic valve 21 is opened in the process of step S107 to allow gas to flow from the second gas chamber 52a to the first gas chamber 51a, the first gas pressure and the second gas pressure may become the same before the first pressure difference becomes 0 or more, and gas may not flow from the second gas chamber 52a to the first gas chamber 51a. In this case, a notification unit such as a display or a buzzer (not shown) may notify the manager of the gas insulation apparatus 200.

[0038] In the first embodiment, one gas chamber is provided for each gas chamber, but the present invention is not limited to this, and multiple gas chambers may be formed by dividing one gas chamber with multiple insulating spacers.

[0039] In the first embodiment, the volume (L) of the gas shortage is shown as the gas index. However, the gas index may be another index such as volume (L) × pressure difference (MPa) that does not use atmospheric pressure.

[0040] Embodiment 2 A gas pressure control device 100 in the second embodiment will be described with reference to Figs. 4 to 6. In Figs. 4 to 6, the same reference numerals as in Figs. 1 to 3 indicate the same or corresponding parts. In the gas pressure control in the first embodiment, the gas that is insufficient in the first gas compartment chamber 51a is obtained from the adjacent second gas compartment chamber 52a. In contrast, in the gas pressure control device in the second embodiment, when the amount of gas that is insufficient in the first gas compartment chamber 51a cannot be covered only by the amount of gas that can be supplied from the adjacent second gas compartment chamber 52a, the amount of gas that can be supplied from the third gas compartment chamber 53a that is adjacent to the second gas compartment chamber 52a, in addition to the first gas compartment chamber 51a, is also covered.

[0041] 4 is a cross-sectional view of a gas pressure control device according to embodiment 2. The gas pressure control device 100 according to embodiment 2 further includes a third gas pressure sensor 13 and a second electronic valve 22. The third gas pressure sensor 13 and the second electronic valve 22, together with a third bus 73 and a second circuit breaker 82, constitute a part of a gas insulation device 200.

[0042] A third gas chamber 53a is formed in the internal space of the third tank 53. Gas is sealed in the third gas chamber 53a. The third tank 53 is connected to the other tanks and other insulating spacers on the opposite side to the second insulating spacer 62. The third tank 53, the other tanks, and the other insulating spacers are fixed by bolts in a sandwiched manner. The second insulating spacer 62 and the other insulating spacer each have a conductive member provided in the center thereof, which holds the third busbar 73.

[0043] The third busbar 73 is composed of a plurality of busbars sandwiching the second circuit breaker 82. The second insulating spacer 62 serves as a second partition member that separates the second gas compartment chamber 52a and the third gas compartment chamber 53a.

[0044] The second pipe 120 is branched to be connected to the second electronic valve 22 in addition to the first electronic valve 21. A third pipe 130 is provided from the inner wall to the outer wall of the third tank 53. The third pipe 130 is connected to the third gas pressure sensor 13. The third gas pressure sensor 13 measures the gas pressure in the third gas compartment chamber 53a (hereinafter referred to as the "third gas pressure") through the third pipe 130. The third pipe 130 is also branched to be connected to the second electronic valve 22. Therefore, the second electronic valve 22 is communicated with the second gas compartment chamber 52a and the third gas compartment chamber 53a through the second pipe 120 and the third pipe 130.

[0045] The second electronic valve 22 has an internal valve that can be opened and closed and a driving force such as a motor (not shown), similar to the first electronic valve 21. The second electronic valve 22 is driven by a signal from the control unit 30 to open and close the valve.

[0046] The control unit 30 is also connected to the third gas pressure sensor 13 and the second electronic valve 22 via wired or wireless communication means such as a LAN cable.

[0047] The control unit 30 acquires the third gas pressure from the third gas pressure sensor 13. The control unit 30 controls the opening and closing of the second electronic valve 22 based on the second gas pressure and the third gas pressure. When the second electronic valve 22 is opened, gas flows between the second gas chamber 52a and the third gas chamber 53a.

[0048] The memory unit 40 stores the volume of the third gas chamber (hereinafter referred to as the "third volume"), the minimum gas pressure to be sealed in the third gas chamber (hereinafter referred to as the "third minimum guaranteed gas pressure"), and other information.

[0049] Next, an example of the pressure etc. of each gas chamber according to embodiment 2 will be shown. Fig. 5 is a table showing an example of the pressure etc. of each gas chamber according to embodiment 2.

[0050] In the second embodiment, a case is described in which the gas shortage in the first gas chamber 51a cannot be met by the gas supply amount of the adjacent second gas chamber 52a alone. Therefore, a case is described in which the gas shortage amount in the first gas chamber 51a in the second embodiment is greater than the gas shortage amount in the first gas chamber 51a in the first embodiment. Specifically, the first gas chamber 51a is different from the first embodiment in that the first gas pressure is 0.2 MPa, the first differential pressure is −0.2 MPa, and the first gas shortage index is −1000 L. The second gas chamber 52a is different from the first embodiment in that the second gas pressure is 0.55 MPa, the first differential pressure is 0.05 MPa, and the first gas supply index is 200 L. In this case, the sum of the first gas shortage index and the first gas supply index is −300 L, which is less than 0. Therefore, even when the first electronic valve 21 is opened and gas is supplied from the second gas chamber 52a to the first gas chamber 51a, the first gas pressure does not become equal to or higher than the first minimum guaranteed gas pressure.

[0051] As described above, the third gas chamber 53a houses the third busbar 73 and the second circuit breaker 82. In the example shown in FIG. 5, the third minimum guaranteed gas pressure is 0.5 MPa. The third capacity is 700 L. The third gas pressure is 0.6 MPa. In this case, the third gas pressure - the third minimum guaranteed gas pressure = 0.1 MPa (hereinafter, the pressure difference between the third gas pressure and the third minimum guaranteed gas pressure is referred to as the "third pressure difference"). Since the third pressure difference is 0 or more, the third gas chamber 53a is filled with gas and can be supplied to the second gas chamber 52a.

[0052] Next, the amount of gas that can be supplied to the second gas chamber 52a in the third gas chamber 53a is calculated based on the third minimum guaranteed gas pressure (referred to as the "second supplyable gas index"). The second supplyable gas amount is calculated as the capacity of the third gas chamber (L) x the third pressure difference (MPa) / atmospheric pressure (MPa) = 700L.

[0053] The third gas pressure is equal to or higher than the second gas pressure. Therefore, by opening the second electronic valve 22, it is possible to supply gas from the third gas chamber 53a to the second gas chamber 52a. Also, the second gas pressure is equal to or higher than the first gas pressure. Therefore, by opening the first electronic valve 21, it is possible to supply gas from the second gas chamber 52a to the first gas chamber 51a. Also, the sum of the first gas shortage index, the first gas supply index, and the second gas supply index is 400L, which is equal to or higher than 0. Thus, after the second electronic valve 22 is opened and gas is caused to flow from the third gas chamber 53a to the second gas chamber 52a, the second electronic valve 22 is closed before the third differential pressure becomes less than 0. Thereafter, the first electronic valve 21 is opened to allow gas to flow from the second gas chamber 52a to the first gas chamber 31a, and then the first electronic valve 21 is closed before the second gas pressure falls below the second minimum guaranteed gas pressure. This makes it possible for the first gas pressure, the second gas pressure, and the fourth gas pressure to be maintained at or above their respective minimum guaranteed gas pressures.

[0054] Next, the process of controlling the gas pressure by controlling the opening and closing of the first electronic valve 21 and the second electronic valve 22 by the control unit 30 of the gas pressure control device 100 according to the second embodiment will be described. FIG. 6 shows a process flow of the gas pressure control performed by the control unit 30 according to the first embodiment. For convenience of explanation, the flow assumes a case where the gas in the first gas compartment chamber 51a is insufficient, the gas in the second gas compartment chamber 52a and the gas in the third gas compartment chamber 53a can be supplied, and the gas insufficient in the first gas compartment chamber 51a cannot be covered by the amount of gas that can be supplied by the second gas compartment chamber 52a alone, as in the example shown in FIG. 5. The process flow will be described using the values ​​of the example shown in FIG. 5 as appropriate.

[0055] In the process of step S105, if the sum of the first gas shortage index and the first supplyable gas index is less than 0 (step S105: NO), or in the process of step S106, if the first gas pressure is higher than the second gas pressure (step S106: NO), the control unit 30 performs a process of acquiring a third gas pressure (step S201). That is, the control unit 30 acquires the third gas pressure via the third gas pressure sensor 13. In the example shown in FIG. 5, the third gas pressure is 0.6 MPa.

[0056] Next, the control unit 30 calculates the third differential pressure (step S202). Specifically, the control unit 30 acquires the third minimum guaranteed gas pressure from the storage unit 40. Then, the control unit 30 calculates the third differential pressure using the third gas pressure and the third minimum guaranteed gas pressure. In the example shown in FIG. 5, the third minimum guaranteed gas pressure is 0.5 MPa, and the third differential pressure is 0.1 MPa.

[0057] Next, the control unit 30 judges whether or not there is an abnormality in the third gas pressure by using the third differential pressure (step S203). Specifically, if the third differential pressure is 0 or more, the control unit 30 judges that the third gas pressure is normal (step S203: YES). That is, it judges that the gas in the third gas chamber 53a is sufficient. On the other hand, if the third differential pressure is less than 0, the control unit judges that the third gas pressure is abnormal (step S203: NO). That is, it judges that the gas in the third gas chamber 53a is insufficient. In the example shown in FIG. 5, the third differential pressure is 0.1 MPa, and since the third differential pressure is 0 or more, it is judged that the third gas pressure is normal and that the gas in the third gas chamber 53a is sufficient. Therefore, in this case, the process of step S203 is YES.

[0058] Next, when the control unit 30 determines that the third gas pressure is normal (step S203: YES), it calculates a second supplyable gas index (step S204). Specifically, the control unit 30 acquires the third capacity from the storage unit 40. Then, the control unit 30 calculates the second supplyable gas index using the third differential pressure and the third capacity. In the example shown in FIG. 5, the third capacity is 700L, and the second supplyable gas index is 700L.

[0059] Next, the control unit 30 judges whether the sum of the first gas shortage index, the first gas supply index, and the second gas supply index is 0 or more (step S205). As a result, in the process of step S105, when the sum of the first gas shortage index and the first gas supply index is less than 0 (step S105: NO), that is, when the gas that is insufficient in the first gas compartment chamber 51a cannot be covered only by the amount of gas that can be supplied from the second gas compartment chamber 52a, the gas can be replenished in the first gas compartment chamber 51a by supplying gas from the third gas compartment chamber 53a via the second gas compartment chamber 52a. In the example shown in FIG. 5, the sum of the first gas shortage index, the first gas supply index, and the second gas supply index is 400L, which is 0 or more (step S205: YES).

[0060] Next, when the control unit 30 judges that the sum of the first gas shortage index, the first gas supply index, and the second gas supply index is equal to or greater than 0 (step S205: YES), it judges whether the third gas pressure is equal to or greater than the second gas pressure (step S206). This allows it to judge whether gas can flow from the third gas chamber 53a to the second gas chamber 52a when the second electronic valve 22 is opened. According to the example shown in FIG. 5, the second gas pressure is 0.55 MPa, and the third gas pressure is 0.6 MPa. Therefore, the third gas pressure is equal to or greater than the second gas pressure (step S206: YES).

[0061] Next, when the control unit 30 determines that the third gas pressure is equal to or higher than the second gas pressure (step S206: YES), it opens the second electronic valve (step S207). After opening the valve, gas flows from the third gas chamber 53a to the second gas chamber 52a.

[0062] Next, the control unit 30 performs the process of step S105, and by supplying gas from the third gas chamber 53a to the second gas chamber 52a, determines whether the sum of the first gas shortage index and the first supply gas index is equal to or greater than 0. After opening the valve, if the sum of the first gas shortage index and the first supply gas index is equal to or greater than 0 (S105: YES), the control unit 30 performs the process of step S106.

[0063] In the process of step S106, if the second gas pressure is equal to or higher than the first gas pressure (step S106: YES), the control unit 30 closes the second electronic valve 22 before the third differential pressure becomes less than 0 (step S208). Before the third differential pressure becomes less than 0, that is, before the third gas pressure becomes less than the third minimum guaranteed gas pressure, the supply of gas from the third gas chamber 53a to the second gas chamber 52a is stopped to prevent a situation in which gas is insufficient in the second gas chamber 53a. Thereafter, the control unit 30 performs the processes of steps S107 and S108 to supply gas from the second gas chamber 52a to the first gas chamber 51a.

[0064] The control unit 30 ends the process when it judges that the third differential pressure is abnormal (step S203: NO) or when it judges that the sum of the first gas shortage index, the first supplyable gas index, and the second supplyable gas index is less than 0 (step S205: NO). This is because, even if the first electronic valve 21 and the second electronic valve 22 are opened, the second gas chamber 52a and the third gas chamber 53a cannot supply the first gas chamber 51a with an amount of gas that makes the first gas pressure equal to or greater than the first minimum guaranteed gas pressure. Moreover, the control unit 30 ends the process when it judges that the third gas pressure is less than the second gas pressure (step S206: NO). This is because, even if the second electronic valve 22 is opened, gas does not flow from the third gas chamber 53a to the second gas chamber 52a. In these cases, a notification unit such as a display or buzzer (not shown) may be used to notify the manager of the gas insulation apparatus 200 that inspection or maintenance is required.

[0065] As described above, the gas pressure control device 100 according to the second embodiment opens the second electronic valve 22 when the sum of the first gas shortage index, the first gas supply index, and the second gas supply index is equal to or greater than 0 and the third gas pressure is equal to or greater than the second gas pressure. After opening the second electronic valve 22, the second electronic valve 22 is closed when the sum of the first gas supply amount and the first gas shortage index becomes equal to or greater than 0 and before the third pressure difference becomes less than 0. Thereafter, gas is supplied from the second gas chamber 52a to the first gas chamber 51a in the same manner as in the first embodiment.

[0066] As described above, before the gas is supplied from the third gas chamber 53a to the second gas chamber 52a, the amount of gas that is insufficient in the first gas chamber 51a cannot be covered by only supplying gas from the second gas chamber 52a to the first gas chamber 51a. That is, the first differential pressure cannot be made equal to or greater than 0 (the first gas pressure cannot be equal to or greater than the first minimum guaranteed gas pressure). However, by supplying gas from the third gas chamber 53a to the second gas chamber 52a, the amount of gas that makes the first differential pressure equal to or greater than 0 can be supplied from the second gas chamber 52a to the first gas chamber 31a. Therefore, even if the first minimum guaranteed gas pressure and the second minimum guaranteed gas pressure are different, the first gas pressure, the second gas pressure, and the third gas pressure can be maintained at a gas pressure equal to or greater than the respective minimum guaranteed gas pressures.

[0067] In the second embodiment, in the process of step S207, when the second electronic valve 22 is opened and gas flows from the third gas chamber 53a to the second gas chamber 52a, the second gas pressure and the third gas pressure may become the same before the sum of the first gas shortage index and the first gas supply index becomes 0, and gas may not flow from the third gas chamber 53a to the second gas chamber 52a. In this case, a notification unit such as a display or a buzzer (not shown) may notify the manager of the gas insulation device 200. In addition, when the second gas pressure and the third gas pressure become the same, if the second gas pressure is higher than the first gas pressure, that is, gas flows from the second gas chamber 52a to the first gas chamber 51a, the second electronic valve 22 is temporarily closed. Then, the first electronic valve 21 is opened to supply gas from the second gas chamber 52a to the first gas chamber 51a, thereby lowering the gas pressure in the second gas chamber 52a.Then, the first electronic valve 21 is closed and the second electronic valve 22 is opened again to supply gas from the third gas chamber 53a to the second gas chamber 52a.

[0068] The present invention provides an appropriate gas pressure in a plurality of gas compartments having different minimum guaranteed gas pressures. Therefore, it is sufficient that the first minimum guaranteed gas pressure and the second minimum guaranteed gas pressure are different values. Therefore, the third minimum guaranteed gas pressure may be the same value as the first minimum guaranteed gas pressure or the second minimum guaranteed gas pressure.

[0069] Embodiment 3 A gas pressure control device 100 in the third embodiment will be described with reference to Figs. 7 to 9. In Figs. 7 to 9, the same reference numerals as those in Figs. 1 to 3 indicate the same or corresponding parts. In the gas pressure control in the first embodiment, the gas that is insufficient in the first gas compartment chamber 51a is obtained from the adjacent second gas compartment chamber 52a. In contrast, in the gas pressure control device in the third embodiment, when the amount of gas that is insufficient in the first gas compartment chamber 51a cannot be covered only by the amount of gas that can be supplied from the adjacent second gas compartment chamber 52a, the amount of gas that can be supplied from the amount of gas that can be supplied from the fourth gas compartment chamber 54a that is adjacent to the first gas compartment chamber 51a, in addition to the second gas compartment chamber 52a, is also covered.

[0070] 7 is a cross-sectional view of a gas pressure control device according to embodiment 3. The gas pressure control device 100 according to embodiment 3 further includes a fourth gas pressure sensor 14 and a third electronic valve 23. The fourth gas pressure sensor 14 and the third electronic valve 23, together with the third insulating spacer 63, the fourth bus bar 74, and the third circuit breaker 83, constitute a part of a gas insulation device 200.

[0071] A fourth gas compartment 54a is formed in the internal space of the fourth tank 54. Gas is sealed in the third gas compartment 54a. The fourth tank 54 is connected to the other tanks and other insulating spacers on the opposite side to the third insulating spacer 63. The fourth tank 54, the other tanks, and the other insulating spacers are fixed by bolts in a sandwiched manner. The third insulating spacer 63 and the other insulating spacers are conductive members provided in the center of each spacer, and hold the fourth busbar 74. The fourth busbar 74 is composed of multiple busbars with the third circuit breaker 83 in between.

[0072] The fourth busbar 74 is composed of a plurality of busbars sandwiching the third circuit breaker 83. The third insulating spacer 63 serves as a third partition member that separates the first gas chamber 51a and the fourth gas chamber 54a.

[0073] The first pipe 110 is branched to be connected to the third electronic valve 23 in addition to the first electronic valve 21. A fourth pipe 140 is provided from the inner wall to the outer wall of the fourth tank 54. The fourth pipe 140 is connected to the fourth gas pressure sensor 14. The fourth gas pressure sensor 14 measures the gas pressure in the fourth gas compartment chamber 54a (hereinafter referred to as the "fourth gas pressure") through the fourth pipe 140. The fourth pipe 140 is also branched to be connected to the third electronic valve 23. Therefore, the third electronic valve 23 is communicated with the first gas compartment chamber 51a and the fourth gas compartment chamber 54a through the first pipe 110 and the fourth pipe 140.

[0074] The third electronic valve 23 has an internal valve that can be opened and closed and a driving force such as a motor (not shown), similar to the first electronic valve 21. The third electronic valve 23 is driven by a signal from the control unit 30 to open and close the valve.

[0075] The control unit 30 is also connected to the fourth gas pressure sensor 14 and the third electronic valve 23 via wired or wireless communication means such as a LAN cable.

[0076] The control unit 30 acquires the fourth gas pressure from the fourth gas pressure sensor 14. The control unit 30 controls the opening and closing of the third electronic valve 23 based on the first gas pressure and the fourth gas pressure. When the third electronic valve 23 is opened, gas flows between the first gas chamber 51a and the fourth gas chamber 54a.

[0077] The memory unit 40 stores the volume of the fourth gas chamber (hereinafter referred to as the "fourth volume"), the minimum gas pressure to be sealed in the fourth gas chamber (hereinafter referred to as the "fourth minimum guaranteed gas pressure"), and other information.

[0078] Next, an example of the pressure etc. of each gas chamber according to embodiment 3 will be shown. Fig. 8 is a table showing an example of the pressure etc. of each gas chamber according to embodiment 3.

[0079] In the third embodiment, as in the second embodiment, a case is described in which the gas shortage in the first gas chamber 51a cannot be met by the amount of gas available in the adjacent second gas chamber 52a alone. As in the second embodiment, a case is described in which the amount of gas available in the first gas chamber 51a in the third embodiment is greater than the amount of gas available in the first gas chamber 51a in the first embodiment. Specifically, the first gas chamber 51a is different from the first embodiment in that the first gas pressure is 0.2 MPa, the first differential pressure is −0.2 MPa, and the first gas shortage index is −1000 L. The first gas supply index is 400 L, as in the first embodiment, so the sum of the first gas shortage index and the first gas supply index is −600 L, which is less than 0. Therefore, even when the first electronic valve 21 is opened and gas is supplied from the second gas chamber 52a to the first gas chamber 51a, the first gas pressure does not become equal to or higher than the first minimum guaranteed gas pressure.

[0080] As described above, the fourth busbar 74 and the third circuit breaker 83 are housed in the fourth gas compartment chamber 54a. In the example shown in FIG. 8, the fourth minimum guaranteed gas pressure is 0.5 MPa. The fourth capacity is 700 L. The third gas pressure is 0.4 MPa. In this case, the fourth gas pressure - the fourth minimum guaranteed gas pressure = 0.1 MPa (hereinafter, the differential pressure between the fourth gas pressure and the fourth minimum guaranteed gas pressure is referred to as the "fourth differential pressure"). Since the fourth differential pressure is 0 or more, the fourth gas compartment chamber 54a is filled with gas and can be supplied to the first gas compartment chamber 51a.

[0081] Next, the amount of gas that can be supplied to the first gas chamber 51a in the fourth gas chamber 54a is calculated based on the fourth minimum guaranteed gas pressure (referred to as the "third supplyable gas index"). The third supplyable gas amount is calculated as the capacity of the fourth gas chamber (L) x the fourth pressure difference (MPa) / atmospheric pressure (MPa) = 700L.

[0082] The fourth gas pressure is equal to or higher than the first gas pressure. Therefore, by opening the third electronic valve 23, it is possible to supply gas from the fourth gas chamber 54a to the first gas chamber 51a. The second gas pressure is equal to or higher than the first gas pressure. Therefore, by opening the first electronic valve 21, it is possible to supply gas from the second gas chamber 52a to the first gas chamber 51a. Furthermore, the sum of the first gas shortage index, the first gas supply index, and the second gas supply index is 100L, which is equal to or higher than 0. Thus, after the third electronic valve 23 is opened and gas is caused to flow from the fourth gas chamber 54a to the first gas chamber 51a, the third electronic valve 23 is closed before the fourth differential pressure becomes less than 0. Thereafter, the first electronic valve 21 is opened to allow gas to flow from the second gas chamber 52a to the first gas chamber 51a, and then the first electronic valve 21 is closed before the second differential pressure becomes less than 0. This makes it possible for the first gas pressure, the second gas pressure, and the fourth gas pressure to be maintained at or above their respective minimum guaranteed gas pressures.

[0083] Next, the process of controlling the gas pressure by controlling the opening and closing of the first electronic valve 21 and the third electronic valve 23 by the control unit 30 of the gas pressure control device 100 according to the third embodiment will be described. FIG. 9 shows a process flow of the gas pressure control performed by the control unit 30 according to the first embodiment. For convenience of explanation, the flow assumes a case where the gas in the first gas compartment chamber 51a is insufficient, the gas in the second gas compartment chamber 52a and the gas in the fourth gas compartment chamber 54a can be supplied, and the gas insufficient in the first gas compartment chamber 51a cannot be covered by the amount of gas that can be supplied by the second gas compartment chamber 52a alone, as in the example shown in FIG. 8. The process flow will be described using the values ​​of the example shown in FIG. 8 as appropriate.

[0084] In the process of step S105, if the sum of the first shortage gas index and the first supplyable gas index is less than 0 (step S105: NO), or in the process of step S106, if the first gas pressure is higher than the second gas pressure (step S106: NO), the control unit 30 performs a process of acquiring a fourth gas pressure (step S301). That is, the control unit 30 acquires the fourth gas pressure via the fourth gas pressure sensor 14. In the example shown in FIG. 8, the fourth gas pressure is 0.6 MPa.

[0085] Next, the control unit 30 calculates the fourth differential pressure (step S302). Specifically, the control unit 30 acquires the fourth minimum guaranteed gas pressure from the storage unit 40. Then, the control unit 30 calculates the fourth differential pressure using the fourth gas pressure and the fourth minimum guaranteed gas pressure. In the example shown in FIG. 8, the fourth minimum guaranteed gas pressure is 0.5 MPa, and the fourth differential pressure is 0.1 MPa.

[0086] Next, the control unit 30 uses the fourth differential pressure to determine whether or not there is an abnormality in the fourth gas pressure (step S303). Specifically, if the fourth differential pressure is 0 or more, the control unit 30 determines that the fourth gas pressure is normal (step S303: YES). That is, it determines that the gas in the fourth gas chamber 54a is sufficient. On the other hand, if the fourth differential pressure is less than 0, the control unit determines that the fourth gas pressure is abnormal (step S303: NO). That is, it determines that the gas in the fourth gas chamber 54a is insufficient. In the example shown in FIG. 8, the fourth differential pressure is 0.1 MPa, and since the fourth differential pressure is 0 or more, it is determined that the fourth gas pressure is normal and the gas in the fourth gas chamber 54a is sufficient. Therefore, in this case, the process in step S303 is YES.

[0087] Next, when the control unit 30 determines that the fourth gas pressure is normal (step S303: YES), it calculates a third supplyable gas index (step S304). Specifically, the control unit 30 acquires the fourth capacity from the storage unit 40. Then, the control unit 30 calculates the third supplyable gas index using the fourth differential pressure and the fourth capacity. In the example shown in FIG. 8, the fourth capacity is 700L, and the third supplyable gas index is 700L.

[0088] Next, the control unit 30 judges whether the sum of the first gas shortage index, the first gas supply index, and the third gas supply index is 0 or more (step S305). As a result, in the process of step S105, when the sum of the first gas shortage index and the first gas supply index is less than 0 (step S305: NO), that is, when the gas that is insufficient in the first gas chamber 51a cannot be covered only by the amount of gas that can be supplied from the second gas chamber 52a, the gas can be replenished by supplying gas from the fourth gas chamber 54a to the first gas chamber 51a. In the example shown in FIG. 8, the sum of the first gas shortage index, the first gas supply index, and the third gas supply index is 100L, which is 0 or more (step S305: YES).

[0089] Next, when the control unit 30 judges that the sum of the first gas shortage index, the first gas supply index, and the third gas supply index is equal to or greater than 0 (step S305: YES), it judges whether the fourth gas pressure is equal to or greater than the first gas pressure (step S306). This allows the control unit 30 to judge whether gas can flow from the fourth gas chamber 54a to the first gas chamber 51a when the third electronic valve 23 is opened. According to the example shown in FIG. 8, the fourth gas pressure is 0.6 MPa, and the first gas pressure is 0.2 Pa. Therefore, in this case, the fourth gas pressure is equal to or greater than the first gas pressure (step S306: YES).

[0090] Next, when the control unit 30 determines that the fourth gas pressure is equal to or higher than the first gas pressure (step S306: YES), it opens the third electronic valve 23 (step S307). After opening the valve, gas flows from the fourth gas chamber 54a to the first gas chamber 51a.

[0091] Next, the control unit 30 performs the process of step S105, and by supplying gas from the third gas chamber 53a to the second gas chamber 52a, determines whether the sum of the first gas shortage index and the first supply gas index is equal to or greater than 0. After opening the valve, if the sum of the first gas shortage index and the first supply gas index is equal to or greater than 0 (S105: YES), the control unit 30 performs the process of step S106.

[0092] In the process of step S106, if the second gas pressure is equal to or higher than the first gas pressure (step S106: YES), the control unit 30 closes the third electronic valve 23 before the fourth differential pressure becomes less than 0 (step S308). Before the fourth differential pressure becomes less than 0, that is, before the fourth gas pressure becomes less than the fourth minimum guaranteed gas pressure, the supply of gas from the fourth gas chamber 54a to the first gas chamber 51a is stopped, thereby preventing a situation in which gas is insufficient in the fourth gas chamber 54a. Thereafter, the control unit 30 performs the processes of steps S107 and S108, and supplies gas from the second gas chamber 52a to the first gas chamber 51a.

[0093] The control unit 30 ends the process when it judges that the fourth differential pressure is abnormal (step S303: NO) or when it judges that the sum of the first gas shortage index and the first supplyable gas index is less than 0 (step S305: NO). This is because, even if the first electronic valve 21 and the third electronic valve 23 are opened, the second gas chamber 52a and the fourth gas chamber 54a cannot supply the first gas chamber 51a with an amount of gas that makes the first gas pressure equal to or greater than the first minimum guaranteed gas pressure. Moreover, the control unit 30 ends the process when it judges that the fourth gas pressure is less than the first gas pressure (step S306: NO). This is because, even if the third electronic valve 23 is opened, gas does not flow from the fourth gas chamber 54a to the first gas chamber 51a. In these cases, a notification unit such as a display or buzzer (not shown) may be used to notify the manager of the gas insulation apparatus 200 that inspection or maintenance is required.

[0094] As described above, the gas pressure control device 100 according to the third embodiment opens the third electronic valve 23 if the sum of the first gas shortage index, the first gas supply index, and the third gas supply index is 0 or more and the fourth gas pressure is the first gas pressure or more. After opening the third electronic valve 23, the second electronic valve 22 that closes the second electronic valve is closed before the fourth pressure difference becomes less than 0 after the sum of the first gas supply amount and the first gas shortage index becomes 0 or more. Thereafter, gas is supplied from the second gas chamber 52a to the first gas chamber 51a in the same manner as in the first embodiment.

[0095] As described above, before the gas is supplied from the fourth gas chamber 54a to the first gas chamber 51a, the amount of gas that is insufficient in the first gas chamber 51a cannot be made up by only supplying gas from the second gas chamber 52a to the first gas chamber 51a. That is, the first differential pressure cannot be 0 or more (the first gas pressure cannot be equal to or higher than the first minimum guaranteed gas pressure). However, when gas is supplied from the fourth gas chamber 54a to the first gas chamber 51a, the first gas pressure becomes equal to or higher than the first minimum guaranteed gas pressure. Therefore, even if the first minimum guaranteed gas pressure and the second minimum guaranteed gas pressure are different, the first gas pressure, the second gas pressure, and the fourth gas pressure can be maintained at a gas pressure equal to or higher than each of the minimum guaranteed gas pressures.

[0096] In the third embodiment, in the process of step S307, when the third electronic valve 23 is opened and gas flows from the fourth gas chamber 54a to the first gas chamber 51a, the fourth gas pressure and the first gas pressure may become the same before the sum of the first gas shortage index and the first gas supply index becomes 0, and gas may not flow from the fourth gas chamber 54a to the first gas chamber 51a. In this case, a notification unit such as a display or a buzzer (not shown) may be used to notify the manager of the gas insulation device 200. In addition, when the fourth gas pressure and the first gas pressure become the same, if the second gas pressure is higher than the first gas pressure, that is, if the first electronic valve 21 is opened, the first differential pressure becomes 0 or more from the second gas chamber 52a to the first gas chamber 51a, and gas flows, the second electronic valve 22 is closed. Then, the first electronic valve 21 may be opened to supply gas from the second gas chamber 52a to the first gas chamber 51a.

[0097] The present invention provides an appropriate gas pressure in a plurality of gas compartments having different minimum guaranteed gas pressures. Therefore, it is sufficient that the first minimum guaranteed gas pressure and the second minimum guaranteed gas pressure are different values. Therefore, the third minimum guaranteed gas pressure may be the same value as the first minimum guaranteed gas pressure or the second minimum guaranteed gas pressure. [Explanation of symbols]

[0098] 11 First gas pressure sensor 12 Second gas pressure sensor 13 Third gas pressure sensor 14 4th Gas Pressure Sensor 21 First electronic valve 22 Second electronic valve 23 Third electronic valve 30 Control section 40 Storage section 51 First Tank 51a First gas compartment 52 Second Tank 52a Second gas compartment 53 Third Tank 53a Third Gas Compartment 54 The Fourth Tank 54a Fourth Gas Compartment 61 First insulating spacer (first partition member) 62 second insulating spacer (second partition member) 63 Third insulating spacer (third partition member) 71 First busbar 72 Second busbar 73 Third busbar 74 4th busbar 81 First Circuit Breaker 82 Second Circuit Breaker 83 Third Circuit Breaker 100 Gas pressure control device 110 First Pipe 120 Second Pipe 130 Third Pipe 140 Fourth Pipe 200 Gas insulated equipment

Claims

1. a first gas pressure sensor for measuring a first gas pressure, which is a pressure of an insulating gas sealed in the first gas chamber; a second gas pressure sensor for measuring a second gas pressure, which is a pressure of an insulating gas sealed in a second gas chamber separated from the first gas chamber by a first partition member having an insulating member; a first electronic valve communicating with the first gas compartment and the second gas compartment; A control unit that controls opening and closing of the first electronic valve; a storage unit that stores a first volume which is the volume of the first gas chamber, a second volume which is the volume of the second gas chamber, a first minimum guaranteed gas pressure which is the lowest gas pressure to be filled in the first gas chamber, and a second minimum guaranteed gas pressure which is the lowest gas pressure to be filled in the second gas chamber and is different from the first minimum guaranteed gas pressure; having The first electronic valve is opened and closed in response to a signal from the control unit, The control unit is acquiring the first gas pressure from the first gas pressure sensor and the second gas pressure from the second gas pressure sensor; acquiring the first capacity, the second capacity, the first minimum guaranteed gas pressure, and the second minimum guaranteed gas pressure from the storage unit; Calculating a first differential pressure between the first gas pressure and the first minimum guaranteed gas pressure; Calculating a second differential pressure between the second gas pressure and the second minimum guaranteed gas pressure; When the first differential pressure is less than 0 and the second differential pressure is equal to or greater than 0, calculating a first gas deficiency index, which is an index indicating an amount of gas that is deficient in the first gas chamber, calculated using the first pressure difference and the first volume; and a first supplyable gas index, which is an index indicating an amount of gas that can be supplied from the second gas chamber to the first gas chamber, calculated using the second pressure difference and the second volume; opening the first electronic valve when the sum of the first gas shortage index and the first supplyable gas index is equal to or greater than 0 and the second gas pressure is equal to or greater than the first gas pressure; If the first differential pressure becomes equal to or greater than 0 after the first electronic valve is opened, the first electronic valve is closed before the second differential pressure becomes less than 0. Gas pressure control device.

2. a third gas pressure sensor that measures a third gas pressure, which is a pressure of an insulating gas sealed in a third gas chamber that is separated from the second gas chamber by a second partition member having an insulating member; a second electronic valve communicating with the second gas compartment and the third gas compartment; and the storage unit stores a third volume, which is a volume of the third gas chamber, and a third minimum guaranteed gas pressure, which is a minimum gas pressure to be sealed in the third gas chamber; The second electronic valve is opened and closed in response to a signal from the control unit, The control unit is Controlling the opening and closing of the second electronic valve; acquiring the third gas pressure from the third gas pressure sensor; acquiring the third capacity and the third minimum guaranteed gas pressure from the storage unit; Calculating a third differential pressure between the third gas pressure and the third minimum guaranteed gas pressure; If the sum of the first supplyable gas indicator and the first shortage gas indicator is less than 0 and the third differential pressure is equal to or greater than 0, calculating a second supplyable gas index, which is an index indicating an amount of gas that can be supplied from the third gas chamber to the second gas chamber, calculated from the third pressure difference and the third volume; opening the second electronic valve when a sum of the first supplyable gas index, the second supplyable gas index, and the first shortage gas index is equal to or greater than 0 and the third gas pressure is equal to or greater than the second gas pressure; After the second electronic valve is opened, if the sum of the first supplyable gas amount and the first gas shortage index becomes 0 or more, the second electronic valve is closed before the third differential pressure becomes less than 0.

2. The gas pressure control device according to claim 1.

3. a fourth gas pressure sensor that measures a fourth gas pressure, which is a pressure of an insulating gas sealed in a fourth gas chamber that is separated from the first gas chamber by a third partition member having an insulating member; a third electronic valve communicating with the first gas compartment and the fourth gas compartment; and the storage unit stores a fourth volume, which is a volume of the fourth gas chamber, and a fourth minimum guaranteed gas pressure, which is a minimum gas pressure to be sealed in the fourth gas chamber; the third electronic valve is opened and closed in response to a signal from the control unit, The control unit is Controlling the opening and closing of the third electronic valve; acquiring the fourth gas pressure from the fourth gas pressure sensor; acquiring the fourth capacity and the fourth minimum guaranteed gas pressure from the storage unit; Calculating a fourth differential pressure between the fourth gas pressure and the fourth minimum guaranteed gas pressure; If the sum of the first supplyable gas indicator and the first shortage gas indicator is less than 0 and the fourth differential pressure is equal to or greater than 0, calculating a third supplyable gas index, which is an index indicating an amount of gas that can be supplied from the fourth gas chamber to the first gas chamber, calculated from the fourth pressure difference and the fourth volume; opening the third electronic valve when a sum of the first supplyable gas index, the third supplyable gas index, and the first shortage gas index is equal to or greater than 0 and the fourth gas pressure is equal to or greater than the first gas pressure; After the third electronic valve is opened, if the sum of the first supplyable gas amount and the first gas shortage index becomes 0 or more, the second electronic valve is closed before the fourth differential pressure becomes less than 0.

3. The gas pressure control device according to claim 1 or 2.