JP2015142089A - emergency transformer cooling system and emergency transformer cooling method of underground substation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which allows for continuous operation of minimum necessary transformers, as first aid, when a secondary cooler has stopped.SOLUTION: A first underground substation emergency transformer cooling system 10A includes a primary cooler 22 for cooling the heat generated from a transformer 11 by the cooling water supplied from a cooling pump 21, and a secondary cooler 23 for cooling the hot water after passing through the primary cooler. The cooling system 10A is further provided with a flow path of an emergency cooling water supply system 14, first flow path switching means 41 for switching the destination of water sent from a water storage tank 33, second flow path switching means 42 for switching the destination of hot water sent from the primary cooler, and third flow path switching means 43 for switching the supply source of water supplied to the cooling water pump. When the cooling function of the secondary cooler is lost, flow path of the makeup water is switched, and the makeup water to be stored in the water storage tank can be supplied cyclically to the primary cooler as the cooling water.

Description

  The present invention relates to a cooling facility for a substation, and more particularly to an underground substation emergency transformer cooling system that enables operation of the minimum necessary transformer when an underground substation is damaged. The present invention relates to an emergency transformer cooling system and an emergency transformer cooling method for underground substations that continue to operate transformers in substations.

  In general, substations installed in urban areas are often installed in the underground part of buildings and are called underground substations. This underground substation is an important facility for power transmission and distribution in urban areas, and the largest is a 500 kV class facility. Such underground substations tend to close up as a social problem such as causing disruption of the urban area due to the supply of electric power to the major institutions in the urban area. Therefore, improving the reliability of underground substations is a major proposition.

  Because of the circumstances described above, not only high reliability is required for equipment (for example, transformers) that make up substations, but also high reliability is required for auxiliary equipment (for example, transformer cooling systems). Sex is required. For example, a transformer cooling system that forms an underground substation is required to have high reliability because the stop of the cooling system is directly connected to the stop of the transformer (self-damage due to heat).

  In addition to being installed in urban areas where electricity demand is high, underground substations are installed on the basement floor of buildings, so heat generated in large quantities by transformers is difficult to dissipate. It is necessary to forcibly release heat from the underground floor to the outside (above ground), and the cooling facilities of underground substations tend to be larger and more complex than substations installed outdoors.

  A general underground substation cooling facility system exchanges heat generated in a transformer in the process of chilled water becoming hot water in a primary cooler installed in the transformer, and then heat from the primary cooler (primary cooling). The cooling water after being heat exchanged in the cooler) is sent to the secondary cooler by a pump, and heat is exchanged in the process of warm water becoming cold water in the secondary cooler.

  In a substation with such a cooling facility, for example, when an underground substation is damaged by an earthquake or fire of an expected size or larger, there is a water channel from the primary cooler to the secondary cooler (cooling tower or dry cooler). There may be a situation in which the secondary cooler enters a stopped state due to breakage or the like. In particular, when a building collapses due to an earthquake, there is a high possibility that the water channel to the secondary cooler will break, and there is a concern that the secondary cooler will stop functioning in this case. Even in such a case, the time to secure a countermeasure time (minimum of half a day, preferably more than half a day) that can solve the problems occurring at the switching of substations and the supply side is an emergency treatment operation state. Even so, it is essential not to stop the operation.

  Considering the circumstances described above, for example, as described in Japanese Patent No. 5320147, when the secondary cooler is stopped, the transformer main body is managed even if it is in the first aid operation state. An emergency transformer cooling system for an underground substation has been proposed that secures an operation time that is equal to or longer than the time constant of the temperature rise leading to damage (usually about 1 to 2 hours) (see, for example, Patent Document 1). ).

Japanese Patent No. 5320147

  In the emergency transformer cooling system for an underground substation described in the above-mentioned cited document 1, the minimum necessary transformer for emergency measures that can avoid the temperature rise that causes damage to the transformer body, depending on the operating conditions. Can be continued for up to several days.

  However, the period of several days is not enough to take measures to prevent the underground substation from shutting down in the event of a major earthquake. Considering the situation of the Great East Japan Earthquake that occurred in March 2011, it took several days to restore the minimum infrastructure. If a large earthquake of the same scale occurred, the minimum infrastructure It must also be assumed that it will take several days or more to recover. Therefore, from the viewpoint of surely avoiding the stoppage of the underground substation, it is more certain that the period in which the transformer can be operated to the minimum necessary for emergency measures is further extended.

  The present invention has been made in consideration of such circumstances, and in the event that a secondary cooler stops due to a disaster such as an earthquake or fire, the minimum necessary transformer is required for emergency measures. It is an object of the present invention to provide an emergency transformer cooling system for an underground substation and its cooling method that enable continuous operation.

  An emergency transformer cooling system for an underground substation according to an embodiment of the present invention is a cooling system for a transformer installed in an underground substation in order to solve the above-described problem. A primary cooler that cools the primary cooler, and a secondary cooler that is installed at a position distant from the primary cooler and cools hot water that is cooling water after passing through the primary cooler, and the primary cooler And cooling the secondary cooler, storing the replenishing water for replenishing the cooling water partially lost due to evaporation, etc., and replenishing the replenishing water tank for replenishing the replenishing water for cooling A replenishment water system having a flow path for storing replenishing water for cooling and connecting a reserving tank equipped with a replenishing water pump and sending cooling replenishing water from the water storage tank to the replenishing water tank, and the primary cooling during normal operation And cool the secondary cooler As a flow path for supplying water, an input end of the primary cooler and an output end of a cooling water pump for supplying cooling water to the input end of the primary cooler are connected, and the output end of the primary cooler and the second end Cooling having a flow path formed so that the cooling water can be circulated by connecting the input end of the secondary cooler and connecting the output end of the secondary cooler and the input end of the cooling water pump. An emergency cooling water supply system having a flow path for connecting the water supply system to the primary cooler via the flow paths of the makeup water system and the cooling water supply system, and the water storage system. One input terminal connected to the tank, a first output terminal that can be opened and closed connected to the makeup water tank, and a second output terminal that can be opened and closed connected to the input terminal of the primary cooler. A plurality of output ends including cooling makeup water introduced from the water storage tank First flow path switching means for selectively switching the supply destination, one input end connected to the output end of the primary cooler, and an openable / closable first connected to the input end of the secondary cooler A plurality of output ends including a third output end and a fourth output end that is openable and closable different from the third output end, and selects a supply destination of the hot water introduced from the primary cooler And a second flow path switching means for switching automatically, and when the cooling function of the secondary cooler is stopped, the cooling water pump and the makeup water pump are stopped. In this state, the first output end and the third output end are closed, and the other end of the temporary pipe disposed so that the fluid discharged from one end flows into the water storage tank is connected to the fourth output end. The replenishment water pump is attached to the output end, and the second output end and the fourth output end are opened. The cooling replenishing water stored in the water storage tank is made to pass through the second output end, the primary cooler, the fourth output end, and the temporary pipe, by starting the storage tank. The cooling water is configured to be supplied to the primary cooler while being returned to the tank and circulated.

  An emergency transformer cooling method for an underground substation according to an embodiment of the present invention is a primary cooler for cooling generated heat of a transformer installed in an underground substation with cooling water in order to solve the above-described problem, A secondary cooler that is installed at a position apart from the primary cooler and cools hot water that is the coolant after passing through the primary cooler, the primary cooler and the secondary cooler Replenishing water tank for replenishing the replenishing water for cooling, replenishing the replenishing water for cooling, replenishing the replenishing water for cooling, or replenishing the cooling water partially lost due to evaporation, and the replenishing water for replenishing the replenishing water tank are stored A replenishment water system having a flow path for connecting the replenishing water pump to the replenishing water tank from the water storage tank, and the primary cooler and the secondary cooler during normal operation. As a flow path for supplying cooling water to The input end of the primary cooler and the output end of the cooling water pump that supplies cooling water to the input end of the primary cooler are connected, and the output end of the primary cooler and the input end of the secondary cooler are connected The output end of the secondary cooler and the input end of the cooling water pump are connected to connect a cooling water supply system having a flow path formed so that the cooling water can be circulated, and An emergency cooling water supply system having a flow path for supplying water from the water storage tank to the primary cooler through the flow paths of the makeup water system and the cooling water supply system, and one input connected to the water storage tank A plurality of output ends including a first output end that can be opened and closed connected to the replenishing water tank, and a second output end that can be opened and closed connected to the input end of the primary cooler. , Selectively switching the supply source of the cooling makeup water introduced from the water tank A first flow path switching means; one input end connected to the output end of the primary cooler; a third output end that can be opened and closed connected to the input end of the secondary cooler; A plurality of output ends including a fourth output end that is openable and closable different from the third output end, and a second flow for selectively switching a supply destination of the hot water introduced from the primary cooler A path switching means, a first input end that is openably and closably connected to an output end of the secondary cooler, a second input end that is openable and closable different from the first input end, and the cooling water pump And an output end connected to be openable and closable, and fluid introduced from one of the first input end and the second input end can be freely opened and closed with the input end of the cooling water pump. And a third flow path switching means for guiding to the output end connected to the cooling system. Is an emergency transformer cooling method for an underground substation using a substation, and when the cooling function of the secondary cooler is stopped, the cooling water pump and the makeup water pump are stopped, With the cooling water pump and the makeup water pump stopped, the first output end and the third output end are closed, and the fluid discharged from one end flows into the water storage tank. The other end of the temporary pipe is attached to the fourth output end, then the second output end and the fourth output end are opened, and the makeup water pump is activated to store water in the water storage tank. The cooling makeup water to be returned to the water storage tank through the second output end, the primary cooler, the fourth output end, and the temporary pipe, and the primary cooler and the water storage tank And supplying the cooling water as the cooling water to the primary cooler. A first stage step of cooling the primary cooler while consuming the cooling make-up water, and an emergency for returning the water to the water storage tank after exchanging heat from the primary cooler with respect to the cooling system; After the cooling facility is further provided, the second channel switching means switches to the circulation channel through which the cooling makeup water circulates between the water storage tank, the primary cooler, and the emergency cooling facility. The emergency cooling facility comprises a second stage step of cooling the cooling makeup water circulating between the water storage tank, the primary cooler, and the emergency cooling facility. To do.

  According to the present invention, when the secondary cooler stops due to a disaster such as an earthquake or a fire, the minimum necessary operation can be continuously performed.

1 is a system schematic diagram (during normal operation) schematically showing an emergency transformer cooling system for an underground substation and its cooling system according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The system schematic which showed roughly the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention, and its cooling system (the 1st stage at the time of emergency operation). BRIEF DESCRIPTION OF THE DRAWINGS The system schematic which showed roughly the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention, and its cooling system (2nd step | paragraph at the time of emergency operation). BRIEF DESCRIPTION OF THE DRAWINGS The system schematic which showed roughly the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention, and its cooling system (the 3rd step in emergency operation). It is the schematic which shows the modification of the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention, and the 1st flow-path switching means of the cooling system, (A) is two three-way The figure which shows the example which connected the valve in series and comprised the 1st flow-path switching means, (B) is connecting the 1 header provided with 3 ports, and the 1 three-way valve in series. The figure which shows the example which comprised the 1 flow-path switching means. Schematic which showed the example of a structure which constituted the water tank of the emergency transformer cooling system of the underground substation which concerns on embodiment of this invention into 2 systems. Explanatory drawing which was an example of the basic composition of the transformer cooling system of an underground substation, and showed the example of a structure by which a secondary cooler is installed outdoors. Explanatory drawing which was an example of the basic composition of the transformer cooling system of an underground substation, and showed the example of a structure by which a secondary cooler is installed indoors. The system schematic which showed roughly the 1st modification of the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention which has transfered to the 2nd step, and its cooling system. The system schematic which showed schematically the 2nd modification of the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention which has transfered to the 2nd step, and its cooling system. The system schematic which showed schematically the modification of the emergency transformer cooling system of the underground substation which concerns on the 1st Embodiment of this invention which has transfered to the 3rd step, and its cooling system. The system schematic diagram (at the time of normal operation) which showed roughly the emergency transformer cooling system of the underground substation concerning the 2nd Embodiment of the present invention, and its cooling system. The system schematic which showed roughly the emergency transformer cooling system of the underground substation which concerns on the 2nd Embodiment of this invention, and its cooling system (the 1st stage at the time of emergency operation). The system schematic which showed roughly the emergency transformer cooling system of the underground substation which concerns on the 2nd Embodiment of this invention, and its cooling system (2nd stage at the time of emergency operation). The system schematic which showed roughly the emergency transformer cooling system of the underground substation which concerns on the 2nd Embodiment of this invention, and its cooling system (the 3rd step in emergency operation).

  Hereinafter, an emergency transformer cooling system for an underground substation according to an embodiment of the present invention (hereinafter referred to as an “underground substation emergency transformer cooling system”) and an emergency transformer cooling method will be described with reference to the drawings. explain.

[First Embodiment]
1 to 4 show an underground substation emergency transformer cooling system (hereinafter referred to as “first underground substation”) which is an example of an underground transformer emergency transformer cooling system according to the first embodiment of the present invention. 10A is a system schematic diagram schematically showing 10A and its cooling system for each operation state.

  More specifically, FIG. 1 is during normal operation (other than emergency operation), FIG. 2 is the first stage during emergency operation (hereinafter simply referred to as “first stage”), and FIG. 3 is during emergency operation. The first substation in the second stage (hereinafter simply referred to as “secondary stage”) and FIG. 4 in the third stage during emergency operation (hereinafter simply referred to as “third stage”). An emergency transformer cooling system 10A and its cooling system are shown.

  The first underground substation emergency transformer cooling system 10A (FIG. 1) during normal operation can be broadly divided into a cooling water supply system 12 that plays a role of cooling the transformer 11 of the underground substation, and a cooling water The coolant water 13 that plays a role of appropriately replenishing the coolant when it decreases, the coolant supply system 12 and the makeup water system 13 are connected, and the coolant from the makeup water system 13 side to the coolant supply system 12 side. The emergency cooling water supply system 14 that enables the supply of water and three systems are provided.

  The systems 12, 13, and 14 of the first underground substation emergency transformer cooling system 10A will be described. In the cooling water supply system 12, the cooling water is carried to the primary cooler 22 by the cooling water pump 21, and the transformer 11 is cooled by heat exchange. Subsequently, the cooling water (hereinafter referred to as “hot water”) that has absorbed the heat generated by the transformer 11 by the primary cooler 22 is further conveyed to the secondary cooler 23, and heat exchange is performed on the hot water by the secondary cooler 23. Cool down. That is, the secondary cooler 23 dissipates the heat of the transformer 11 absorbed in the hot water in the process of exchanging the hot water to the outside, and uses the hot water as cold water. Subsequently, the cooling water that has become cold water in the secondary cooler 23 is returned to the cooling water pump 21.

  Since the replenishing water system 13 is reduced by evaporation or the like in the process of circulating the cooling water through the cooling water supply system 12, the replenishing water tank 31 and the cooling water supply system 12 are appropriately supplied with the replenishing water stored in the replenishing water tank 31, The cooling water supply system 12 is supplied through the connected expansion pipe 32. The replenishing water for cooling the replenishing water tank 31 is replenished by appropriately sending out the water in the water storage tank 33 that has been stored in advance by drawing water from a water source such as a water supply. When the replenishing water for cooling in the replenishing water tank 31 overflows, it is drained from the overflow pipe 35.

  The water storage tank 33 is configured by connecting a plurality of water tanks such as four water tanks 33-1 to 33-4 with a communication pipe 37, for example. The water storage tank 33 does not necessarily have a configuration in which a plurality of water tanks are connected by the communication pipe 37 and may be a single water tank, but is preferably configured by a plurality of water tanks. This is because, in the case of one water tank, depending on the embodiment to be implemented, it may be necessary to additionally install a partition (partition) in an emergency.

  The emergency cooling water supply system 14 is a cold water supply system that is not used during normal operation, and is used in an emergency such as the function of the secondary cooler 23 being stopped due to a disaster. The emergency cooling water supply system 14 has a flow path that connects the cooling water supply system 12 and the make-up water system 13, and supplies the make-up water stored in the water storage tank 33 in an emergency from the make-up water system 13 to the cooling water supply system. The role leading to 12.

  Further, in the first underground substation emergency transformer cooling system 10A, it is necessary to freely switch the flow path according to the operation stage in normal operation and emergency. Therefore, for example, first, second, and third flow path switching means 41A, 42, and 43 are provided as components for switching the flow paths.

  The first flow path switching unit 41A is a flow path switching unit including, for example, four ports (input end and output end). Three of the four ports of the first flow path switching means 41A are connected to the makeup water tank 31, the output end of the cooling water pump 21, and the water tank 33, respectively. Further, the remaining one port is connected to a temporary pipe 45 (FIG. 4) for supplying cooling makeup water to an emergency cooling facility 47 (FIG. 4) in a third stage to be described later. Among the ports of the first flow path switching means 41A, at least a port serving as an output end, that is, a port connected to the makeup water tank 31, a port connected to the output end of the cooling water pump 21, and a third described later. Any port to which the temporary pipe 45 is connected in the next stage is configured to be openable and closable.

  The first flow path switching means 41A is, for example, a header 411 having four ports in which at least three ports are configured to be openable and closable. By opening and closing the valves 412, 413, and 414, the water storage tank 33 is provided. The supply destination of the makeup water is switched to any one of the makeup water tank 31 (during normal operation), the primary cooler 22 (first and second stages), and the emergency cooling equipment 47 (third stage).

  The second flow path switching means 42 is a flow path switching means including, for example, three ports (input end and output end). Two of the three ports of the second flow path switching means 42 are connected to the output end of the primary cooler 22 and the input end of the secondary cooler 23, respectively. The remaining one port is closed as a spare during normal operation, and is used with a temporary pipe 45 (FIGS. 2 to 4) attached during emergency operation. Of the ports of the second flow path switching means 42, which is at least an output end port, that is, a port connected to the input end of the secondary cooler 23 and a port closed as a spare during normal operation, Is also configured to be openable and closable.

  The second flow path switching means 42 is, for example, a header 421 having three ports in which at least two ports are configured to be openable and closable. By opening and closing the valves 422 and 423, the second flow path switching means 42 is removed from the primary cooler 22. The hot water supply destination is switched between the secondary cooler 23 (during normal operation) and the valve 423 (during emergency operation). In order to make the transition to the second stage faster, the second flow path switching means 42 shown in FIGS. 1 to 4 is provided with a valve 423 that is closed as a spare during normal operation. The path is branched between the valve 423 and the header 421, and a valve 424 is further provided in the branched flow path.

  The third flow path switching means 43 is a flow path switching means including, for example, three ports (input end and output end). Two of the three ports of the third flow path switching unit 43 are connected to the output end of the secondary cooler 23 and the input end of the cooling water pump 21, respectively. The remaining one port is closed as a reserve under circumstances other than the third stage, and is used with a temporary pipe 45 (FIG. 4) attached to the third stage. Of the ports of the third flow path switching means 43, at least the ports serving as input ends, that is, the ports connected to the output end of the secondary cooler 23, and the ports closed as spares during normal operation or the like are Both are configured to be openable and closable.

  The third flow path switching unit 43 is, for example, a header 431 having three ports configured so that at least two ports can be freely opened and closed. By opening and closing the valves 432 and 433, the third flow path switching unit 43 is supplied to the cooling water pump 21. The supply source of the cooling water to be returned is switched between the secondary cooler 23 (during normal operation) and the valve 433 (third stage).

  The temporary tube 45 (FIGS. 2, 3, and 4) is a detachable flexible tube that is attached during emergency operation. For example, the temporary tube 45 is thermoplastic on both sides of a cylindrical fabric formed by weaving resin fibers in a cylindrical shape. A hose or the like covered with a coating material such as resin. As this hose, for example, Paljet (registered trademark) of Ashimori Industry Co., Ltd. or a similar product can be adopted. A hose made of such a cylindrical fabric has advantages such that it can be stored compactly during normal operation and has little deterioration during storage.

  The emergency cooling equipment 47 is a temporary cooling equipment that is additionally installed at the time of transition from the primary stage to the secondary stage, and plays the same role as the secondary cooler 23. The emergency cooling equipment 47 is, so to speak, the temporary secondary cooler 23, and includes a temporary cooling tower such as a dry cooling tower or an open cooling tower 471. The open type cooling tower 471 as a temporary cooling tower is installed in a stable place such as the ground surface.

  The dry cooling tower and the open type cooling tower 471 are more costly, carrying in and assembling, storing, and versatile than the case where other cooling towers such as the closed type cooling tower 473 (FIG. 11) are employed. It is superior to other cooling towers. Specifically, it is relatively inexpensive, relatively light and easy to carry in, out and assemble, and can be carried in by transport equipment such as trailers and helicopters from the viewpoint of weight and size, The advantage is that it can be stored in parts and that the cooling tower used in other facilities can be used.

  The first underground substation emergency transformer cooling system 10A shown in FIGS. 1 to 4 is an example, and is not limited to the illustrated configuration. For example, when the number of primary coolers 22 shown in FIG. 1 is different, in FIG. 1, when channels that are not multiplexed are multiplexed, or other than valves 412 to 414, 422 to 424, 432, and 433 This may be the case where the valve is added as appropriate. Further, the valves 412 to 414, 422 to 424, 432, and 433 can be arbitrarily selected regardless of whether they are manual valves or electric valves.

  Subsequently, some modifications of the first underground substation emergency transformer cooling system 10A (during normal operation: FIG. 1) will be described.

  FIG. 5 (FIG. 5 (A) and FIG. 5 (B)) is a schematic diagram showing a modification of the first flow path switching means 41A provided in the first underground substation emergency transformer cooling system 10A. FIG. 6 is a schematic diagram illustrating the configuration of the water storage tanks 33x and 33y, which is a configuration example in which the water storage tanks of the emergency transformer cooling system of the underground substation according to the embodiment of the present invention are divided into two systems. Note that the open / closed state of each port of the first flow path switching means 41A shown in FIG. 5 is a state during normal operation.

  The first flow path switching means 41A may be configured by connecting two three-way valves 415 and 416 in series in addition to the configuration illustrated in FIGS. 1 to 4 (FIG. 5A), 412, a T-shaped joint 418 in which one port is connected to the valve 412, and one of the two ports not opened / closed by the valve 412 of the T-shaped joint 418 and one port of the three-way valve 416. Can be configured in series (FIG. 5B).

  FIG. 5 shows a modified example of the first flow path switching means 41A, but the second and third flow path switching means 42 and 43, which are other flow path switching means, are also the first one. Similar to the flow path switching unit 41A, a configuration other than the configuration illustrated in FIGS. 1 to 4 (for example, one three-way valve, one T-shaped joint, and two valves (two-way valve) are connected. Can be adopted.

  On the other hand, the configuration of the water storage tank 33 is not limited to the example shown in FIGS. That is, the water storage tank 33 in the first underground substation emergency transformer cooling system 10A shown in FIGS. 1 to 4 is one system, but as illustrated in FIG. (Multiplexed) storage tanks 33x and 33y may be used.

  In the first underground substation emergency transformer cooling system 10A in which a plurality of systematic (multiplexed) water storage tanks 33x and 33y are installed, one of the makeup water pumps 34 is connected to the water storage tank 33x on the first system side. Even if it is in a situation where the temperature of the water in the water storage tank 33x rises and cannot be used as cooling water by disposing the other side of the makeup water pump 34 to the water storage tank 33y on the second system side, the water storage tank The transformer 11 can be cooled using the water of the water storage tank 33y which is a system different from 33x, and the water of the water storage tank 33x can be naturally cooled during that time.

  Subsequently, as the emergency transformer cooling method of the underground substation according to the first embodiment of the present invention, the cooling of the transformer 11 of the underground substation using the first underground substation emergency transformer cooling system 10A. A method (hereinafter, simply referred to as “first transformer cooling method”) will be described.

  In the case of the first underground substation emergency transformer cooling system 10A during normal operation (other than during emergency operation) (FIG. 1), the flow path of the emergency cooling water supply system 14 is closed, and the supply water tank 31 is replenished. The flow path of the makeup water system 13 for supplying water is open. That is, the valve 412 of the first flow path switching unit 41A is open and the valve 413 is closed. Note that the valve 414 is also closed during normal operation.

  In the cooling water supply system 12, the cooling water pump 21, the primary cooler 22, the second flow path switching means 42, the secondary cooler 23, the third flow path switching means 43, and the cooling water pump 21 are looped. A flow path through which cooling water flows is formed. In the normal operation, in the second flow path switching unit 42, the valve 422 is open and the valve 423 and the valve 424 are closed. In the third flow path switching unit 43, the valve 432 is open and the valve 433 is closed.

  Under this circumstance, in the cooling water supply system 12, the cooling water pump 21 operates and cooling water for cooling the transformer 11 is supplied from the cooling water pump 21. The cooling water supplied from the cooling water pump 21 is supplied from the cooling water pump 21 to the primary cooler 22, the second flow path switching means 42 (header 421 and valve 422), the secondary cooler 23, and the third flow path. It circulates in the flow path which returns to the cooling water pump 21 via the switching means 43 (the valve 432 and the header 431).

  Further, when the cooling water becomes insufficient in the circulation process of the cooling water, the cooling water is appropriately supplied to the cooling water supply system 12 from the makeup water tank 31 via the expansion pipe 32. When the makeup water in the makeup water tank 31 is insufficient, the makeup water pump 34 is operated intermittently, and the water in the water storage tank 33 is appropriately sent to the makeup water tank 31 via the flow path of the makeup water system 13. Refill with.

  On the other hand, when a situation such as a disaster such as an earthquake or a fire occurs and the function of the secondary cooler 23 is stopped (lost) (in the case of emergency operation: FIGS. 2, 3 and 4), In the first underground substation emergency transformer cooling system 10A, first, as an initial response, the operation proceeds to the first stage during emergency operation to cool the transformer 11. Thereafter, the transformer 11 is cooled by sequentially shifting to a second stage and a third stage where the transformer 11 can be cooled more stably (over a long period of time).

  The transition from the normal operation to the primary stage stops the cooling water pump 21 and the makeup water pump 34 as a first step. As a subsequent second step, the valves 412 and 422 that are open during normal operation are closed so that the flow path is switched so that the supply destination of the makeup water stored in the water storage tank 33 is the primary cooler 22. Furthermore, as a subsequent third step, one end of the temporary pipe 45 (FIG. 2) is attached to the valve 423, and the other end of the temporary pipe 45 is disposed so that water passing through the valve 423 flows into the water storage tank 33. .

  The position where the other end of the temporary pipe 45 is disposed is a tank different from the tank 33-1 where the makeup water pump 34 is installed (first underground substation shown in FIG. 2) from the viewpoint of delaying the temperature rise as much as possible. In the emergency transformer cooling system 10A, the water tanks 33-2, 33-3, 33-4) are preferable. A more preferable position at which the other end of the temporary pipe 45 is disposed is a water tank separated from the water tank 33-1 (in the first underground substation emergency transformer cooling system 10A shown in FIG. , 33-4), and the most preferable position is the tank located farthest from the first tank 33-1 (in the first underground substation emergency transformer cooling system 10A shown in FIG. 2, the tank 33). -4).

  As a subsequent fourth step, the valve 413 of the closed first flow path switching means 41A and the valve 423 of the second flow path switching means 42 are opened. That is, the flow path from the valve 412 to the supply water tank 31 side in the flow path of the makeup water system 13 and the flow path from the valve 422 to the secondary cooler 23 side in the flow path of the cooling water supply system 12 are closed, and emergency cooling is performed. By opening the flow path of the water supply system 14 and the valve 423, the water in the water storage tank 33 is switched to the circulation flow path that passes the water through the primary cooler 22 and returns it to the water storage tank 33.

  As a subsequent fifth step, the makeup water pump 34 is activated. Thus, the water in the water storage tank 33 flows into the flow path of the emergency cooling water supply system 14 via the first flow path switching means 41A (header 411 and valve 413), and the flow of the emergency cooling water supply system 14 It flows into the primary cooler 22 from the passage, and circulates in the circulation flow path that flows from the primary cooler 22 into the water storage tank 33 via the second flow path switching means 42 (header 421 and valve 423). When the first to fifth steps are completed, the first substation emergency transformer cooling system 10A completes the process of transitioning to the first stage (FIG. 2).

  In the first substation emergency transformer cooling system 10A (FIG. 2) that has shifted to the first stage, the water in the water storage tank 33 can be used even if the function of the secondary cooler 23 is lost. Can be supplied to the primary cooler 22, so that the heat of the transformer 11 can be absorbed by the water supplied from the water storage tank 33 and dissipated. Moreover, since the hot water after recovering the heat of the transformer 11 is returned to the water storage tank 33, the water required for cooling the transformer 11 can be circulated and reused. 11 can be cooled.

  Here, it supplements about an effect | action of 10 A of 1st underground substation emergency transformer cooling systems which can transfer to a 1st stage.

  In the first underground substation emergency transformer cooling system 10A, the water temperature on the inlet side (before cooling) of the primary cooler 22 of the transformer 11 is about 50 ° C. during normal operation, and the water temperature on the outlet side (after cooling). Is about 60 ° C., whereas the water in the water tank 33 supplied to the primary cooler 22 in the first and second stages is about 20 ° C. and the water temperature is lower than in normal operation because it is stored underground. Since a large cooling effect can be obtained, the amount of cooling water supplied to the primary cooler 22 can be reduced compared to that during normal operation.

  For example, even when the operation is performed with the same load as that during normal operation, the temperature difference increases from about 10 ° C. to about 40 ° C. Therefore, in order to obtain a cooling effect equivalent to that during normal operation, about 1/4. It can be done with the amount of water. This means that the cross-sectional area of the flow path of the emergency cooling water supply system 14 used in the first and second stages is about 1 with respect to the cross-sectional area of the flow path of the cooling water supply system 12 used during normal operation. This means that it can be set to / 4.

  Even if the water supply capacity of the make-up water pump 34 is less than ¼ of the water supply capacity of the cooling water pump 21, the make-up water pump 34 is usually made redundant (multiplexed). As shown in FIG. 4, since at least two units should be installed, it is possible to secure 1/4 of the water supply capacity of the cooling water pump 21 by operating the two units.

  Note that the emergency load is rarely 100% of the load during normal operation. For example, when it is 80%, the amount of heat generated is 64% load loss (theoretical value) and a slight amount. Since there is no load loss, the amount of cooling water can be further reduced. In most cases, it is not necessary to operate two make-up water pumps 34, and this requirement will be sufficiently satisfied with normal plant design specifications. Can do.

  However, in the state of the first stage described above, the temperature of the water in the water tank 33 rises as the heat of the transformer 11 is recovered, so that the transformer 11 cannot be cooled in about several days. End up. Therefore, it is preferable to shift to a stage (second and third stages described below) that can be continuously cooled over a longer period than the first stage.

  In consideration of such circumstances, in the first underground substation emergency transformer cooling system 10A and its cooling method, as soon as preparation is completed, cutting of existing pipes, addition of new pipes and valves, etc. Cooling can be continuously performed over a longer period by simple operations such as attaching and detaching (changing) the temporary pipe 45 and opening and closing the valves 412, 413, 422 to 424, etc., without making major modifications. It is possible to move to the second and third stages.

  The transition from the primary stage to the secondary stage requires at least preparation work for procurement and installation of the emergency cooling equipment 47. Further, when installing the emergency cooling equipment 47, it is stored in advance from the viewpoint of shortening the work time for shifting from the primary stage to the secondary stage, that is, the time for stopping the makeup water pump 34. Temporary pipes 45 (45-1, 45-2) are prepared, and the second flow path is switched to a temporary cooling tower (the example shown in FIGS. 3 and 4 is an open type cooling tower 471) as the emergency cooling equipment 47. Two pipes, a temporary pipe 45-1 that can be attached to the valve 423 (or valve 424) of the means 42 and a temporary pipe 45-2 that returns (inflows) water cooled by the open type cooling tower 471 to the water storage tank 33. It is better to work to attach one end of the temporary pipe 45 (45-1, 45-2). When this preparatory work is completed, it is possible to move from the primary stage to the secondary stage.

  The transition from the primary stage to the secondary stage stops the makeup water pump 34 as a first step. As a subsequent second step, the temporary pipe 45 (FIG. 2) attached to the valve 423 is removed, and the other end of the temporary pipe 45-1 attached to the input end of the open type cooling tower 471 is attached to the valve 423. At the same time, the output end of the open type cooling tower 471 and the other end of the temporary pipe 45-2 attached are arranged to flow into the water storage tank 33 (switching of the temporary pipe 45). As a subsequent third step, the makeup water pump 34 is activated. When the first to third steps are completed, the first underground substation emergency transformer cooling system 10A completes the transition from the primary stage (FIG. 2) to the secondary stage (FIG. 3).

  When the valve 424 is provided (FIGS. 1 to 4), the temporary tube 45 (FIG. 2) attached to the valve 423 is not removed and attached to the input end of the open cooling tower 471 as it is. The second step is performed by attaching the other end of the temporary pipe 45-1 (configured to be attachable to the valve 424) to the valve 424 and switching the open / close state of the valve 423 and the valve 424 thereafter. Can do. In this case, there is no need to change the temporary pipe 45 (FIG. 2) attached to the valve 423, so that the primary stage can be more quickly shifted to the secondary stage.

  In the first underground substation emergency transformer cooling system 10 </ b> A (FIG. 3) that has shifted to the second stage, the makeup water pump 34 is activated so that the water in the water storage tank 33 is supplied by the makeup water pump 34. It is pumped up and flows into the flow path of the emergency cooling water supply system 14 via the first flow path switching means 41A (header 411 and valve 413), and from the flow path of the emergency cooling water supply system 14 to the primary cooler 22 A circulating flow that flows into the open cooling tower 471 from the primary cooler 22 via the second flow path switching means 42 (header 421 and valve 424) and flows into the water storage tank 33 from the open cooling tower 471. Circulate the road.

  In this way, in the first underground substation emergency transformer cooling system 10A that has shifted to the second stage, the hot water that has passed through the primary cooler 22 is cooled by the open cooling tower 471 (heat exchange). ) Can be returned to the water storage tank 33, so that not only can the heat of the transformer 11 be dissipated, but the water returns to the water storage tank 33 at a temperature lower than that of the first stage. It can be kept low. Therefore, under the operating environment of the transformer 11 under the same conditions, the water in the water storage tank 33 can be prevented from being heated, and the transformer 11 is cooled in the first order even if the consumption due to evaporation is taken into consideration. It can continue for a longer period than the stage.

  Note that the valve 423 and the valve 424 may be used in reverse in the process of shifting from the normal operation to the primary stage and in the process of shifting from the primary stage to the secondary stage. That is, in the process of shifting from the normal operation to the first stage, one end of the temporary pipe 45 (FIG. 2) is attached to the valve 423, but can be attached to the valve 424 instead of the valve 423. In this case, in the process of shifting from the primary stage to the secondary stage, the input end of the open cooling tower 471 and the other end of the temporary pipe 45-1 attached (configured to be attachable to the valve 423). Is attached to valve 423 instead of valve 424.

  Subsequently, the transition from the second stage to the third stage is performed in the open cooling tower as the emergency cooling equipment 47 from the viewpoint of shortening the time for the transition, that is, the time for stopping the makeup water pump 34. It is preferable to prepare in advance to attach one end of the temporary pipe 45-3 to the makeup water input end for supplying makeup water to 471.

  The transition from the second stage to the third stage stops the makeup water pump 34 as the first step. As the subsequent second step, the other end of the temporary pipe 45-3 whose one end is attached to the makeup water input end of the open type cooling tower 471 is attached to the valve 414 of the first flow path switching means 41A, and the temporary pipe 45- 2 is attached to the valve 433 of the third flow path switching means 43. As a subsequent third step, the valve 413 is closed and the valve 414 and the valve 433 are opened.

  As a result, as in normal operation, from the water supply tank 33 via the valve 414, the system for supplying makeup water to the emergency cooling equipment 47 (open cooling tower 471), and the output end of the cooling water pump 21, The coolant pump 21 passes through the primary cooler 22, the valve 424 of the second flow path switching means 42, the emergency cooling equipment 47 (open cooling tower 471), and the valve 433 of the third flow path switching means 43. And a system for returning to the input terminal of each.

  As a subsequent fourth step, the cooling water pump 21 is started. When the cooling water pump 21 is started, the cooling water sent out from the cooling water pump 21 is supplied to the primary cooler 22, the valve 424 of the second flow path switching means 42, the emergency cooling equipment 47 (open cooling tower 471), And it circulates through the circulation channel which returns to the cooling water pump 21 via the valve 433 of the 3rd channel switching means 43. When the first to fourth steps are completed, the first substation emergency transformer cooling system 10A completes the transition from the second stage (FIG. 3) to the third stage (FIG. 4).

  In the first underground substation emergency transformer cooling system 10A (FIG. 4) that has shifted to the third stage, the valve 413 is closed and the valve 414 is opened so that the water in the water storage tank 33 is changed to the emergency cooling water. Instead of flowing into the flow path of the supply system 14, it is introduced into the open cooling tower 471 through the valve 414 and the temporary pipe 45-3. The makeup water pump 34 is activated when the makeup water needs to be replenished.

  In addition, by starting the cooling water pump 21, the cooling water sent from the cooling water pump 21 flows into the primary cooler 22 without flowing into the flow path of the emergency cooling water supply system 14, and the primary cooler 22. From the open type cooling tower 471 through the second flow path switching means 42 (header 421 and valve 424) and the third flow path switching means 43 (valve 433 and header 431). Is circulated through the circulation flow path that flows into the cooling water pump 21 via.

  In this way, in the first underground substation emergency transformer cooling system 10A that has shifted to the third stage, the cooling water pump 21 can cool the transformer 11 in the same manner as during normal operation. For example, the transformer 11 can be operated with a high load such as 100% load, which cannot be taken in the first and second stages using the water fed from the makeup water pump 34. Furthermore, if water can be supplied to the water storage tank 33 from other water sources (for example, water storage facilities such as fire prevention water tanks, lakes, dams, ponds, rivers, water supply vehicles such as tank trucks loaded with water, etc.) By replenishing the tank 33 with water, it is possible to operate for a longer period of time.

  The first underground substation emergency transformer cooling system 10A is not only a case of newly installing a transformer cooling system in an underground substation, but also a significant system compared to the transformer cooling system in an existing underground substation. It can be applied without changing or adding many devices. Next, an example in which the first underground substation emergency transformer cooling system 10A is applied to a transformer cooling system of an underground substation that is conventionally applied will be described.

  FIG. 7 is an explanatory diagram showing a configuration example in which the secondary cooler 23 is installed outdoors (rooftop) as an example of the basic configuration of the transformer cooling system of the underground substation, and FIG. 8 is the transformer cooling of the underground substation. It is explanatory drawing which showed the example of a structure by which the secondary cooler 23 is installed indoors as an example of the basic composition of a system.

  Conventionally applied transformer cooling systems for underground substations are roughly divided into two types as shown in FIGS. 7 and 8 depending on the location where the secondary cooler 23 is installed. The emergency transformer cooling system 10A can be applied to any of the above methods without significant system changes or significant addition of equipment. 7 and 8, a part of the configuration is omitted, but it is assumed that the water storage tank 33 and the makeup water pump 34 shown in FIG. In FIG. 8, it is assumed that the makeup water tank 31 shown in FIG. 1 is installed indoors.

  To configure the first underground substation emergency transformer cooling system 10A with respect to the conventional underground substation transformer cooling system as shown in FIG. Although it is necessary to add the first to third flow path switching means 41A, 42, 43, the flow path of the emergency cooling water supply system 14 needs only about a dozen meters [m] even if the scale of the substation equipment is large. The first to third flow path switching means 41A, 42, 43 are composed of headers 411, 421, 431 and valves 412 to 414, 422 to 424, 432, 433, so that the system change is slight, and The number of basic components that can be easily procured is small (about 10).

  On the other hand, in the transformer cooling system of the conventional underground substation as shown in FIG. 8, since the secondary cooler 23 is installed indoors, the transformer 11 radiated through the secondary cooler 23 It is necessary to exhaust heat to the outdoors. Therefore, cold air taken in from the intake duct is passed through the secondary cooler 23, and the air that has absorbed the heat of the transformer 11 is forcibly exhausted by the blower 49 via the secondary cooler 23.

  Even if the first underground substation emergency transformer cooling system 10A is configured for the transformer cooling system of the underground substation shown in FIG. 8, the case shown in FIG. Similarly, the system can be constructed, and the heat of the transformer 11 absorbed in the water supplied from the water storage tank 33 can be radiated to the outdoors.

  In the case of the transformer cooling system of the underground substation shown in FIG. 8, the building is as much as the distance between the primary cooler 22 and the secondary cooler 23 is shorter than that of the transformer cooling system of the underground substation shown in FIG. It seems that it is hard to assume the situation where the function of the secondary cooler 23 stops because it is strong against collapse. However, in the case of the transformer cooling system for an underground substation shown in FIG. 8, all vents in the floor including the intake duct and the exhaust duct may be closed due to the occurrence of a fire or the like. In such a situation, it is considered that the heat of the secondary cooler 23 cannot be dissipated and the function of the secondary cooler 23 is stopped. Therefore, the transformer cooling system of the underground substation shown in FIG. In contrast, the first underground substation emergency transformer cooling system 10A is a useful system.

  Thus, in the first underground substation emergency transformer cooling system 10A and the first transformer cooling method, the secondary cooler 23 has stopped functioning due to a disaster such as an earthquake or fire. Even in the case of an emergency, the water in the water storage tank 33 stored in the basement can be directly supplied to the primary cooler 22 as cooling water by using a makeup water pump 34 that usually sends makeup water to the makeup water tank 31. Even if there is no emergency cooling facility 47, the cooling of the transformer 11 can be continued without supplying water to the water tank 33 within a period of several days. 11 can be operated (first stage).

  Even if the emergency cooling facility 47 is not possible within a period of several days, the cooling of the transformer 11 can be continued for a longer period if water can be supplied to the water storage tank 33. . Therefore, after shifting to the first stage, the operation of the minimum required transformer 11 can be continued for a longer period of time by regularly continuing the water supply to the water storage tank 33.

  Further, in the first underground substation emergency transformer cooling system 10A and the first transformer cooling method, if the emergency cooling equipment 47 can be procured, temporary pipes 45 (45-1, 45-) serving as temporary flow paths are provided. 2) is attached to the emergency cooling equipment 47, the temporary pipe 45 already attached to the valve 423 is connected to the temporary pipe 45-1, or the temporary pipe 45-1 is attached to the valve 424, and then the valve 423 is installed. The warm water after passing through the primary cooler 22 is cooled (heat exchanged) by the open cooling tower 471 and then transferred to the water storage tank 33 by a simple operation without modification of the system such as closing and opening the valve 424. Can be returned (second stage).

  In the second stage, when the transformer 11 is operated under the same conditions, the amount of water in the water tank 33 can be reduced less than in the first stage, and the transformer 11 is cooled more than in the first stage. There is an advantage that it can be continued for a long time. If the first substation emergency transformer cooling system 10A and the first transformer cooling method are applied, the water to the water tank 33 can be supplied to the water tank 33 more than the first stage by a simple operation without system modification. It is possible to shift to the second stage having a long period during which the cooling of the transformer 11 can be continued without replenishment.

  Furthermore, the first underground substation emergency transformer cooling system 10A and the first transformer cooling method are provided for system installation such as installation of temporary pipes 45-2 and 45-3 and opening / closing operations of valves 413, 414 and 433. Through a simple operation that does not involve refurbishment, the transformer 11 can be cooled by the cooling water pump 21 as in normal operation (third stage).

  The first underground substation emergency transformer cooling system 10A, which has shifted to the third stage, has an emergency secondary cooler 23 compared to the first underground substation emergency transformer cooling system 10A during normal operation. Although there is a difference between the point being the cooling equipment 47 and the point that some of the pipes are the temporary pipes 45, there is no substantial difference in terms of the action and effects relating to the cooling of the transformer 11. That is, in the third stage, there is an advantage that the transformer 11 can be operated at a high load (for example, a load of 100% with respect to the load during normal operation) that cannot be performed in the first and second stages. .

  Therefore, if the first underground substation emergency transformer cooling system 10A and the first transformer cooling method are applied, the transformer can be transformed with a high load equivalent to that during normal operation by a simple operation without system modification. It is possible to shift to the third stage in which the vessel 11 can be operated.

  In addition, according to the first underground substation emergency transformer cooling system 10A and the first transformer cooling method, the temporary underground pipe 45 is used for connection to equipment that is not used during normal operation. In addition, it is possible to minimize the amount of work required when refurbishing from the transformer cooling system at the station, and to easily change the connection when the stage is shifted during emergency operation.

  Further, according to the first underground substation emergency transformer cooling system 10A and the first transformer cooling method, a small number (about 10 points) that is easy to procure compared to the conventional underground substation transformer cooling system. ) By changing the system to the first substation emergency transformer cooling system 10A by adding a minor system change, without requiring major system changes or adding a large amount of equipment. It is possible to modify (renovate) the conventional underground substation transformer cooling system to the first underground substation emergency transformer cooling system 10A.

  In addition, 10 A of 1st underground substation emergency transformer cooling systems shown by FIGS. 1-4 show an example, and are not necessarily limited to the structure shown in figure. For example, in the first underground substation emergency transformer cooling system 10A shown in FIG. 1 (during normal operation), the first flow path switching means 41A includes a port that can be opened and closed by a valve 414. The port can be omitted if it allows relatively minor refurbishment of the system, such as connecting or disconnecting piping or adding valves.

  Further, the configuration of the first underground substation emergency transformer cooling system 10A that has shifted to the second stage and the third stage is not limited to the configuration example shown in FIGS. An example can also be adopted.

  9 and 10 schematically show a modification of the first underground substation emergency transformer cooling system 10A using the open cooling tower 471 that has shifted to the second stage, and its cooling system. It is a system schematic diagram. FIG. 11 schematically shows a first underground substation emergency transformer cooling system 10A using a closed cooling tower 473 that has shifted to the third stage, and a modification of the cooling system. FIG. 9 to 11 are for emergency cooling among the components of the first underground substation emergency transformer cooling system 10A shown in FIGS. Some configurations such as a configuration that is not closely related to heat exchange in the equipment 47 are omitted.

  In the first underground substation emergency transformer cooling system 10A (second stage) shown in FIGS. 9 and 10, an emergency cooling facility configured by connecting an open cooling tower 471 and a heat exchanger. 47 is added. The heat exchanger is configured by a plate heat exchanger 472 suitable for liquid heat exchange, for example. In addition, an emergency cooling water pump 51 that pumps up the water flowing into the water tank 33-4 from the open type cooling tower 471 and sends it to the secondary side input end of the plate heat exchanger 472 is additionally provided.

  In the first underground substation emergency transformer cooling system 10A shown in FIG. 9, the valve 424 and the primary-side input end of the plate heat exchanger 472 are connected by a temporary pipe 45, and the plate heat exchanger The secondary side output end of 472 and the input end of the open type cooling tower 471 are connected by a temporary pipe 45-1, and the output end of the emergency cooling water pump 51 and the secondary side input of the plate heat exchanger 472 are connected. The ends are connected by a temporary pipe 45.

  In addition, a temporary pipe 45-2 is attached to the output end of the open type cooling tower 471, and a temporary pipe 45 is attached to the primary output end of the plate heat exchanger 472. Furthermore, the water flowing out from the temporary pipe 45-2 is caused to flow into the water tank 33-4 in which the emergency cooling water pump 51 is installed. Furthermore, the water tank 33-located farthest from the water tank 33-4 where the emergency cooling water pump 51 is installed flows out of the temporary pipe 45 attached to the primary output end of the plate heat exchanger 472. 1 to flow.

  Water flowing out from the temporary pipe 45 attached to the primary side output end of the plate heat exchanger 472 flows into the water tank 33-1 located farthest from the water tank 33-4 where the emergency cooling water pump 51 is installed. The reason is that the water exchanged by the plate heat exchanger 472 is heat-exchanged to be somewhat lower in temperature, but is relatively less than the cold water flowing into the water tank 33-4 cooled by the open cooling tower 471. This is because the temperature of the water flowing from the open type cooling tower 471 to the water tank 33-4 is prevented from rising and the heat exchange amount is kept high. Further, there is also a meaning of separating water that is somewhat dirty in the open cooling tower 471 and water that flows into the primary cooler 22 (not shown in FIG. 9).

  As described above, in the first underground substation emergency transformer cooling system 10A shown in FIG. 9, the hot water after passing through the primary cooler 22 is cooled (heat exchanged) by the open cooling tower 471, and then the stored water is stored. Since the heat can be returned to the tank 33 (water tank 33-4) and further radiated through the plate heat exchanger 472, the transformer is similar to the first underground substation emergency transformer cooling system 10A shown in FIG. 11 heat can be dissipated.

  In the first underground substation emergency transformer cooling system 10A shown in FIG. 10, the components of the emergency cooling facility 47 are compared to the first underground substation emergency transformer cooling system 10A shown in FIG. Although the communication pipe 37 is closed with the lid 53, the tank groups 33-1 and 33-2 and the emergency cooling water pump 51 communicating with the tank 33-1 in which the makeup water pump 34 is installed are provided. It flows out from the point which isolates the tank group 33-3 and 33-4 which communicates with the installed water tank 33-4, and the temporary pipe 45 attached to the output side of the primary side of the plate-type heat exchanger 472. It differs from the point where water flows in.

  In the first underground substation emergency transformer cooling system 10A shown in FIG. 10, a tank group 33-1, 33-2 communicating with a tank 33-1 in which a makeup water pump 34 is installed, and an emergency cooling water pump. The water tank groups 33-3 and 33-4 communicating with the water tank 33-4 in which 51 is installed are isolated. Further, the position flowing out from the temporary pipe 45 attached to the primary side output end of the plate heat exchanger 472 is a tank group 33-1, 33- communicating with the tank 33-1 in which the makeup water pump 34 is installed. 2 is the water tank 33-2 located farthest from the water tank 33-1 in which the makeup water pump 34 is installed.

  The water flowing out from the temporary pipe 45 attached to the primary output end of the plate heat exchanger 472 is connected to the water tank groups 33-1 and 33-2 in communication with the water tank 33-1 where the makeup water pump 34 is installed. Among them, the reason for flowing into the water tank 33-2 located farthest from the water tank 33-1 where the makeup water pump 34 is installed is that the speed at which the temperature of the water stored in the water storage tank 33 rises as slow as possible. It is to do.

  In this way, in the first underground substation emergency transformer cooling system 10A shown in FIG. 10, the hot water after passing through the primary cooler 22 (not shown in FIG. 10) is cooled by the open cooling tower 471 ( After heat exchange), the water can be returned to the water storage tank 33 (water tank 33-4) and further radiated through the plate heat exchanger 472.

  Further, in the first underground substation emergency transformer cooling system 10A shown in FIG. 10, the tank groups 33-1 and 33-2 communicating with the tank 33-1 in which the makeup water pump 34 is installed and the emergency cooling are provided. Since the water tank groups 33-3 and 33-4 communicating with the water tank 33-4 in which the water pump 51 is installed are isolated, the contamination mixed from the open type cooling tower 471 is removed from the primary cooler 22 (not shown in FIG. 10). ) Can be prevented from entering the cooling system, and the temperature difference between the primary side and the secondary side of the plate heat exchanger 472 can be reliably maintained.

  In the first underground substation emergency transformer cooling system 10 </ b> A (third stage) shown in FIG. 11, a sealed cooling tower 473 is installed as the emergency cooling equipment 47. The water supplied from the valve 474 via the make-up water pump 34 and the valve 414 is sprayed water of the sealed cooling tower 473, and a part of the sprayed water evaporates to cool the cooling water flowing in the sealed cooling pipe. To do. Further, since the sealed cooling tower 473 is not open to the atmosphere, in addition to the sealed cooling tower 473, a pressure adjusting means in the flow path for absorbing (adjusting) expansion and contraction due to temperature change is additionally provided. The

  In the example shown in FIG. 11, the pressure adjusting means in the flow path is composed of a pressure vessel 476 having a liquid level adjusting function and a valve 478, and the expansion of the cooling water flowing in the sealed cooling pipe of the sealed cooling tower 473 and Shrinkage is absorbed by fluctuations in the liquid level of the pressure vessel 476. The pressure vessel 476 may be an emergency replenishment water tank.

  The closed type cooling tower 473 is more expensive than the open type cooling tower 471 and has the disadvantages that it is heavy and has poor workability for carrying in and assembling. However, it does not exchange heat (cool) directly in contact with outside air. Therefore, there are advantages such as that the water quality is hardly deteriorated and the influence on the load side can be suppressed to a small degree, and that the built-in heat exchanger is less likely to cause corrosion and scale (scale).

[Second Embodiment]
12 to 15 show an underground substation emergency transformer cooling system (hereinafter referred to as “second underground substation”) which is an example of an underground substation emergency transformer cooling system according to the second embodiment of the present invention. It is a system schematic diagram schematically showing the emergency transformer cooling system) 10B and its cooling system, respectively, during normal operation (FIG. 12), the first stage (FIG. 13), and the second stage, respectively. FIG. 14 is a system schematic diagram of the second substation emergency transformer cooling system 10B and its cooling system in the third stage (FIG. 15).

  The second underground substation emergency transformer cooling system 10B is different from the first underground substation emergency transformer cooling system 10A in that the first channel switching means instead of the first channel switching means 41A. Although the point that 41B is provided, the point that the valve 61 is additionally provided, and the point that the flow path between the valve 413 and the valve 61 is configured by the valve 413 and the temporary pipe 45 that is detachable from the valve 61 are different. The other points are not substantially different. Therefore, in the present embodiment, the difference from the first underground substation emergency transformer cooling system 10A will be mainly described and substantially different from the components of the first underground substation emergency transformer cooling system 10A. Components that are not used are given the same reference numerals and description thereof is omitted.

  The second underground substation emergency transformer cooling system 10B (FIG. 12) during normal operation is the first in comparison with the first underground substation emergency transformer cooling system 10A (FIG. 1) during normal operation. Instead of the first channel switching unit 41A, a first channel switching unit 41B is provided.

  The first flow path switching means 41B is a flow path switching means having three ports (input end and output end), and has a configuration in which the valve 414 is omitted from the first flow path switching means 41A. . Accordingly, the first flow path switching unit 41B is, for example, a header 411 having three ports in which at least two ports are configured to be openable and closable. For example, by opening and closing the valves 412 and 413, The supply destination of makeup water in the tank 33 is switched to either the makeup water tank 31 (during normal operation), or the primary cooler 22 (first and second stages) and the emergency cooling equipment 47 (third stage). .

  Of the three ports of the first flow path switching means 41 </ b> B, the port that is not opened or closed is connected to the water storage tank 33. Further, for the remaining valves 412 and 413 that are two openable and closable ports, the valve 412 is connected to the makeup water tank 31, and the valve 413 is connected to the valve 61 via the temporary pipe 45 in the first and second stages. In the third stage, the emergency cooling equipment 47 (FIG. 15) is connected via the temporary pipe 45-3.

  The valve 61 is between the valve 413 and the input end of the primary cooler 22, and is more than the flow path of the coolant supply system 12 that connects the output end of the coolant pump 21 and the input end of the primary cooler 22. It is provided at a location near the valve 413 and opens and closes the flow path of the emergency cooling water supply system 14 that connects the flow path of the makeup water system 13 and the flow path of the cooling water supply system 12. The valve 61 is closed during normal operation and in the third stage, and is opened in the first and second stages.

  In the second underground substation emergency transformer cooling system 10B, in normal operation (FIG. 12), the valve 413 and the valve 61 are physically separated (there is no channel to be connected) In the primary stage (FIG. 13) and the secondary stage (FIG. 14), the valve 413 and the valve 61 are connected by a temporary pipe 45 and physically connected as a flow path of the emergency cooling water supply system 14. In the third stage (FIG. 15), the valve 413 and the valve 61 are physically separated again, the valve 413 is connected to the temporary pipe 45-3, and the valve 61 is closed.

  Subsequently, as the emergency transformer cooling method for the underground substation according to the second embodiment of the present invention, the cooling of the transformer 11 of the underground substation using the second underground substation emergency transformer cooling system 10B. A method (hereinafter, simply referred to as “second transformer cooling method”) will be described.

  In the second transformer cooling method, when the function of the secondary cooler 23 is stopped (lost) (in the case of emergency operation: FIGS. 13, 14, and 15), the first stage, the second stage The stage and the point where it is possible to move to the third stage are the same as those of the first transformer cooling method, but the detailed steps are different. Specifically, there is a difference between the step of transition from the normal operation (FIG. 12) to the first stage (FIG. 13) and the step of transition from the second stage (FIG. 14) to the third stage (FIG. 15). doing. Therefore, in the following description of the second transformer cooling method, the above differences will be mainly described, and description overlapping with the description of the first transformer cooling method will be omitted (or simplified).

  In the second transformer cooling method, since the second underground substation emergency transformer cooling system 10B does not have the flow path of the emergency cooling water supply system 14 during normal operation, the first stage from the normal operation time. When shifting to, the step of attaching the temporary pipe 45 for connecting the valve 413 and the valve 61 is required first (first step). Thereafter, the first to third steps of the first transformer cooling method are performed (second to fourth steps). As the fifth step, the valve 413 of the closed first flow path switching means 41A, the valve 61 and the valve 423 of the second flow path switching means 42 are opened.

  That is, the flow path from the valve 412 to the supply water tank 31 side in the flow path of the makeup water system 13 and the flow path from the valve 422 to the secondary cooler 23 side in the flow path of the cooling water supply system 12 are closed, and emergency cooling is performed. By opening the flow path of the water supply system 14 and the valve 423, the water in the water storage tank 33 is switched to the circulation flow path that passes the water through the primary cooler 22 and returns it to the water storage tank 33.

  As a subsequent sixth step, the makeup water pump 34 is activated. As a result, similarly to the first transformer cooling method, the water in the water storage tank 33 can be supplied to the circulation passage through the primary cooler 22 and returned to the water storage tank 33. In the second transformer cooling method, when the first to sixth steps are completed, the second underground substation emergency transformer cooling system 10B completes the transition to the first stage.

  In addition, the transition from the second stage to the third stage of the second underground substation emergency transformer cooling system 10B is the temporary pipe 45 connected to the valve 413 with respect to the first transformer cooling method. And the point of further comprising the step of closing the valve 61 and the attachment destination of the other end of the temporary pipe 45-3 in the second step of the first transformer cooling method. Although different, the other steps are similar.

  That is, in the second transformer cooling method, the makeup water pump 34 is stopped as the first step. As a subsequent second step, the valve 413 and the valve 61 of the first flow path switching unit 41B are closed, and the temporary pipe 45 attached to the valve 413 is removed. As the following third step, the other end of the temporary pipe 45-3, one end of which is attached to the makeup water input end of the open type cooling tower 471, is attached to the valve 413, and the other end of the temporary pipe 45-2 (water tank 33 side). Is attached to the valve 433 of the third flow path switching means 43.

  As a subsequent fourth step, the valve 413 and the valve 433 are opened. As a result, as in normal operation, from the water supply tank 33 via the valve 413 to the supply cooling water to the emergency cooling equipment 47 (open cooling tower 471), from the output end of the cooling water pump 21, The coolant pump 21 passes through the primary cooler 22, the valve 424 of the second flow path switching means 42, the emergency cooling equipment 47 (open cooling tower 471), and the valve 433 of the third flow path switching means 43. And a circulation system for returning to the input terminal of each.

  As a subsequent fifth step, the cooling water pump 21 is started. When the cooling water pump 21 is started, the cooling water sent out from the cooling water pump 21 is supplied to the primary cooler 22, the valve 424 of the second flow path switching means 42, the emergency cooling equipment 47 (open cooling tower 471), And it circulates through the circulation channel which returns to the cooling water pump 21 via the valve 433 of the 3rd channel switching means 43. When the amount of cooling water decreases due to evaporation from the open type cooling tower 471 or the like, the level of the spray water tank decreases, and the replenishing water pump 34 supplies the replenishing water for cooling the water storage tank 33. When the first to fifth steps are completed, the second underground substation emergency transformer cooling system 10B completes the transition from the second stage to the third stage.

  Thus, according to the second underground substation emergency transformer cooling system 10B and the second transformer cooling method, the first underground substation emergency transformer cooling system 10A and the first transformer cooling method. The same effect can be obtained.

  In addition, the second underground substation emergency transformer cooling system 10B is more suitable than the first underground substation emergency transformer cooling system 10A when renovating the conventional underground substation transformer cooling system. In the case of an emergency when the number of valves and pipes to be installed is small and the function of the secondary cooler 23 has stopped, it is possible to move to the first stage, the second stage, and the third stage in order. The substation emergency transformer cooling system can be modified more easily.

  As described above, according to the first and second underground substation emergency transformer cooling systems 10A and 10B and the first and second transformer cooling methods, the functions of the secondary cooler 23 are affected by disasters such as earthquakes and fires. Even in the case of an emergency where the water supply has stopped, the water in the water storage tank 33 stored in the basement by using the replenishing water pump 34 that sends the replenishing water to the replenishing water tank 31 is usually directly supplied to the primary cooler 22 as cooling water. Since it can be supplied, even if there is no emergency cooling facility 47, the cooling of the transformer 11 can be continued without supplying water to the water storage tank 33 within a period of several days. The transformer 11 can be operated at the minimum necessary level (first stage).

  Further, according to the first and second underground substation emergency transformer cooling systems 10A and 10B and the first and second transformer cooling methods, the temporary pipe 45 and the temporary pipe 45-1 already attached to the valve 423 are used. The primary cooler 22 is made to flow through a simple operation that does not involve modification of the system, such as changing the connection with the valve or attaching the temporary pipe 45-1 to the valve 424 and then closing the valve 423 and opening the valve 424. After the hot water is cooled (heat exchanged) by the open type cooling tower 471, it can be returned to the water storage tank 33 (second stage).

  Further, according to the first and second underground substation emergency transformer cooling systems 10A and 10B and the first and second transformer cooling methods, the installation of temporary pipes 45-2 and 45-3 and valves 413 and 414 The transformer 11 can be cooled by the cooling water pump 21 as in the normal operation by a simple operation that does not involve system modification such as opening / closing operation 433 (third stage). By shifting to the third stage, the transformer 11 can be operated at a high load that cannot be performed in the first and second stages (for example, 100% of the load during normal operation). Moreover, the transformer 11 can be operated for a longer period by replenishing water from the other water sources to the circulation path of the cooling water such as the water storage tank 33 in the second and third stages.

  Further, according to the first and second underground substation emergency transformer cooling systems 10A and 10B and the first and second transformer cooling methods, the conventional underground substation transformer cooling system is also procured. It is possible to change to the first and second underground substation emergency transformer cooling systems 10A and 10B by a minor system change that easily installs a small number of basic parts (about 10). The first and second underground substation emergency transformer cooling systems 10A and 10B are constructed by modifying (renovating) the conventional underground substation transformer cooling system without requiring modification or adding a large amount of equipment. Can do.

  The present invention is not limited to the above-described embodiment as it is, and can be carried out in various forms other than the above-described examples in the implementation stage, and various omissions can be made without departing from the gist of the invention. , Add, replace, change. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. For example, adding a valve 414 to the first flow path switching means 41B of the second underground substation emergency transformer cooling system 10B, that is, instead of the first flow path switching means 41B, the first flow An underground substation emergency transformer cooling system in which the path switching means 41A is provided can also be constructed.

10A First underground substation emergency transformer cooling system 10B Second underground substation emergency transformer cooling system 11 Transformer 12 Cooling water supply system 13 Makeup water system 14 Emergency cooling water supply system 21 Cooling water pump 22 Primary Cooler 23 Secondary cooler 31 Makeup water tank 32 Expansion pipes 33, 33x, 33y Water storage tanks 33-1 to 33-4 Water tank 34 Makeup water pump 35 Overflow pipe 37 Communication pipe 41A, 41B First flow path switching means 411 Header 412, 413, 414 valve (two-way valve)
415, 416 Three-way valve 418 T-shaped joint 42 Second flow path switching means 421 Header 422, 423, 424 Valve (two-way valve)
43 Third flow path switching means 431 Header 432, 433 Valve (two-way valve)
45 (45-1 to 45-3) Temporary pipe 47 Emergency cooling equipment 471 Open cooling tower 472 Plate heat exchanger 473 Sealed cooling tower 474, 477, 478 Valve 476 Pressure vessel 49 Blower 51 Emergency cooling water pump 53 Lid 61 Valve

Claims (12)

In the cooling system for transformers installed in underground substations,
A primary cooler that cools the generated heat of the transformer with cooling water, and a secondary cooling that is installed at a position away from the primary cooler and cools hot water that is cooling water after passing through the primary cooler Equipped with
Replenishing water tank for cooling the primary cooler and the secondary cooler, storing replenishing water for replenishing the cooling water partially lost by evaporation or the like, and replenishing the replenishing water for cooling, and A replenishment water system having a flow path for storing the replenishing water for replenishing to the replenishing water tank and connecting a water reserving tank having a replenishing water pump to the replenishing water tank and sending the replenishing water for cooling from the water storage tank to the replenishing water tank; As a flow path for supplying cooling water to the primary cooler and the secondary cooler during normal operation, an input end of the primary cooler and an output end of a cooling water pump for supplying cooling water to the input end of the primary cooler Are connected, the output end of the primary cooler and the input end of the secondary cooler are connected, and the output end of the secondary cooler and the input end of the cooling water pump are connected, A flow path in which the cooling water is circulated. And a cooling water supply system connected, the emergency cooling water supply system having a supply passage of water of the reservoir to the primary cooler side through the flow path of the makeup water system and the cooling water supply system to,
One input end connected to the water storage tank, a first openable output terminal connected to the makeup water tank, and a second openable output terminal connected to the input end of the primary cooler A first flow path switching means that selectively switches the supply destination of the cooling makeup water introduced from the water storage tank,
One input end connected to the output end of the primary cooler, a third output end that can be freely opened and closed connected to the input end of the secondary cooler, and an opening / closing different from the third output end A plurality of output ends including a fourth output end, and a second flow path switching means for selectively switching a supply destination of the hot water introduced from the primary cooler. Configured,
When the cooling function of the secondary cooler is stopped, the first output end and the third output end are closed with the cooling water pump and the makeup water pump stopped. The other end of the temporary pipe disposed so that the fluid discharged from one end flows into the water storage tank is attached to the fourth output end, and the second output end and the fourth output end are opened. Then, by activating the makeup water pump, the cooling makeup water stored in the water tank is supplied to the second output end, the primary cooler, the fourth output end, and the temporary pipe. An emergency transformer cooling system for an underground substation, wherein the cooling water is supplied to the primary cooler while circulating through the water storage tank.   A first input terminal that is openably and closably connected to an output terminal of the secondary cooler; a second input terminal that is openable and closable different from the first input terminal; and an input terminal of the cooling water pump that is openable and closable. An output end connected freely, and the fluid introduced from any one of the first input end and the second input end is openably and closably connected to the input end of the cooling water pump. The emergency transformer cooling system for an underground substation according to claim 1, further comprising third flow path switching means for guiding to the output end. It is between the second output end and the input end of the primary cooler and is closer to the second output end than a flow path connecting the output end of the cooling water pump and the input end of the primary cooler. Further provided with a first valve at the point,
3. The underground substation according to claim 1, wherein the flow path of the emergency cooling water supply system includes a temporary pipe that is detachably attached to the second output end and the first valve. 4. Emergency transformer cooling system. The first flow path switching unit includes an input terminal connected to the water storage tank, a header including the first output terminal and the second output terminal, and an input terminal connected to the water storage tank. The first output end and the second output end, and at least the first output end is closed and the second output end is open; and the first output end The emergency transformer cooling of an underground substation according to claim 3, characterized in that it is configured with one of three-way valves that can be switched between a state in which the second output end is closed and the second output end is closed. system. The second flow path switching means is an openable / closable output end different from the third output end and the fourth output end, and the cooling function of the secondary cooler is stopped. The water storage tank is further provided with an emergency cooling facility that later functions as the secondary cooler, and the hot water that is the cooling water after passing through the primary cooler to be introduced is cooled by the emergency cooling facility When switching to the flow path to return to the emergency cooling equipment, the emergency cooling equipment is arranged so that water from the other end of the temporary pipe whose one end is attached to the output end of the emergency cooling equipment flows into the water storage tank. An emergency transformer for an underground substation according to any one of claims 1 to 4, further comprising a seventh output end to which the other end of the temporary pipe whose one end is attached to the input end of the substation can be attached. Cooling system. The cooling water after passing through the primary cooler to be introduced by further providing an emergency cooling facility that plays the role of the secondary cooler after the cooling function of the secondary cooler is stopped When the hot water is cooled by the emergency cooling facility and then switched to a flow path that returns to the water tank,
A temporary pipe that can be attached to the fourth output end instead of the other end of the temporary pipe attached to the fourth output end is replaced with the fourth output end and the input end of the emergency cooling facility. Attach one end of the temporary pipe to the output end of the emergency cooling equipment, and arrange the other end of the temporary pipe so that the water from the emergency cooling equipment flows into the water storage tank through the attached temporary pipe By performing, it is comprised so that switching to the flow path which returns the said hot water to the said water tank after cooling with the said emergency cooling equipment is possible. Underground transformer substation emergency transformer cooling system. It is between the second output end and the input end of the primary cooler and is closer to the second output end than a flow path connecting the output end of the cooling water pump and the input end of the primary cooler. The first valve is further provided at the location, and the flow path of the emergency cooling water supply system is constituted by a temporary pipe that is detachable from the second output end and the first valve,
After the cooling function of the secondary cooler has stopped, a system for supplying the cooling makeup water from the water storage tank to the emergency cooling facility via the second output end, and 2 from the output end of the cooling water pump to the primary cooler, the fourth output end, the emergency cooling facility, and the system returning to the input end of the cooling water pump via the second input end When securing the independent system and restarting the operation of the cooling water pump,
A temporary pipe that connects the second input end and the emergency cooling facility is attached, and a temporary water input end that supplies the cooling makeup water to the emergency cooling facility and the second output end are connected temporarily. The emergency transformer cooling system for an underground substation according to claim 6, wherein the two independent systems can be secured by attaching a pipe and closing the first valve. . A primary cooler that cools the heat generated by a transformer installed in an underground substation with cooling water, and hot water that is installed at a position away from the primary cooler and that passes through the primary cooler. A secondary cooler that cools the primary cooler and the secondary cooler, and stores cooling makeup water that replenishes the cooling water that is partially lost due to evaporation or the like, and stores the cooling A replenishing water tank for replenishing the replenishing water, and a water storage tank for storing the replenishing water for replenishing the replenishing water tank and having a replenishing water pump, and connecting the replenishing water for cooling from the water storage tank to the replenishing water tank. As a flow path for supplying cooling water to the primary cooler and the secondary cooler during normal operation, and to the input end of the primary cooler and the input end of the primary cooler Connected to the output end of the cooling water pump that supplies cooling water. The output end of the primary cooler and the input end of the secondary cooler are connected, and the output end of the secondary cooler and the input end of the cooling water pump are connected, whereby the cooling water Is connected to a cooling water supply system having a flow path formed so as to be able to circulate, and the water in the water storage tank is supplied to the primary cooler side through the flow paths of the makeup water system and the cooling water supply system. An emergency cooling water supply system having a path, one input terminal connected to the water storage tank, a first openable / closable output terminal connected to the makeup water tank, and an input terminal of the primary cooler A plurality of output ends including a second output end that can be opened and closed, and a first flow path switching means that selectively switches the supply destination of the cooling makeup water introduced from the water storage tank; One input end connected to the output end of the primary cooler, and the secondary cooling A plurality of output terminals including a third output terminal that is openable and closable connected to the input terminal and a fourth output terminal that is openable and closable different from the third output terminal. Second flow path switching means for selectively switching a supply destination of the hot water introduced from the first input terminal, a first input terminal that is openably and closably connected to an output terminal of the secondary cooler, and the first input A second input end that is openable and closable different from the end, and an output end that is openably and closably connected to the input end of the cooling water pump, and any one of the first input end and the second input end And a third flow path switching means for guiding the fluid introduced from either one of the cooling water pumps to the output end connected to the input end of the cooling water pump so as to be openable and closable. Substation emergency transformer cooling method,
When the cooling function of the secondary cooler is stopped, the cooling water pump and the makeup water pump are stopped, and the cooling water pump and the makeup water pump are stopped, The first output end and the third output end are closed, and the other end of the temporary pipe disposed so that the fluid discharged from one end flows into the water storage tank is attached to the fourth output end. By opening the second output end and the fourth output end and starting the make-up water pump, the cooling make-up water stored in the water storage tank is changed to the second output end, Returning to the water storage tank via the primary cooler, the fourth output end, and the temporary pipe, supplying the cooling water as the cooling water to the primary cooler while circulating the primary cooler and the water storage tank, The primary cooler is cooled while consuming the cooling makeup water. A step of primary stage of,
After the cooling system is further provided with an emergency cooling facility for exchanging the hot water from the primary cooler and then returning to the water tank, the second flow path switching means is connected to the water tank and the primary. By switching to a circulation path through which the cooling make-up water circulates between a cooler and the emergency cooling facility, the emergency cooling facility is connected to the water storage tank, the primary cooler, and the emergency cooling facility. A secondary stage step of cooling the cooling make-up water circulating between the substation and the emergency transformer cooling method for an underground substation. When the water tank is configured by communicating a plurality of water tanks in series, and the emergency cooling facility is a cooling tower,
Of the plurality of water tanks, an emergency cooling water pump installed in a water tank different from the water tank where the makeup water pump is installed, and a heat exchanger from the fourth output end to the cooling tower The water tank located farthest from the water tank in which the emergency cooling water pump is installed after exchanging heat between the hot water heading for and the water pumped up by the emergency cooling water pump A step of cooling the hot water from the fourth output end to the emergency cooling facility by the heat exchanger and the cooling tower. An emergency transformer cooling method for an underground substation according to claim 8. When the water tank group communicating with the water tank where the replenishing water pump is installed and the water tank group communicating with the water tank where the emergency cooling water pump is installed are isolated by closing the communication pipe through which the water tank communicates,
In the step where the heat exchanger and the cooling tower cool the warm water from the fourth output end to the emergency cooling facility, the water tank into which the water after heat exchange with the warm water flows is replenished. The underground transformer substation emergency transformation according to claim 9, wherein the tank is located farthest from the tank in which the makeup water pump is installed among the tank group in communication with the tank in which the water pump is installed. Cooling method. The cooling system is further provided with a first valve provided between the second output end and the input end of the primary cooler, and the second output end and the first valve are connected to each other. When the flow path to be connected is composed of a temporary tube that is detachable from the second output end and the first valve,
A pipe that connects the second input end and the emergency cooling facility is attached, and a temporary pipe that connects a makeup water input end that supplies makeup water to the emergency cooling facility and the second output end is attached, By closing the first valve, a system for supplying the makeup water from the water storage tank to the emergency cooling facility via the second output end, and an output end of the cooling water pump, the primary A cooler, a fourth output end, the emergency cooling facility, and a system returning to the input end of the cooling water pump via the second input end, and securing the emergency cooling facility to the water storage The method further includes the step of operating without supplying the makeup water stored in the tank and shifting to the third stage in which the makeup water stored in the water storage tank is used as the makeup water of the emergency cooling facility. The features of claims 8 to 1 Any emergency transformer cooling method underground substation according to one of. When the first flow path switching means comprises three output ends, the first output end, the second output end, and the fifth output end,
A pipe that connects the second input end and the emergency cooling facility is attached, and a temporary pipe that connects a makeup water input end that supplies makeup water to the emergency cooling facility and the fifth output end is attached. By closing the second output end, a system for supplying the makeup water from the water storage tank to the emergency cooling facility via the fifth output end, and an output end of the cooling water pump, A primary cooler, the fourth output end, the emergency cooling facility, and a system that returns to the input end of the cooling water pump via the second input end are secured, and the emergency cooling facility is The method further includes a step of operating without supplying the makeup water stored in the water storage tank and shifting to a third stage in which the makeup water stored in the water storage tank is used as the makeup water of the emergency cooling facility. Or claim 8 characterized in that Emergency transformer cooling method underground substation according to any one of 10.

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