JP2006017055A - Hydraulic power generating facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic power generating facility installed with ease and at low cost without lowering available head. <P>SOLUTION: This hydraulic power generating facility 1 is composed of an incline 6, a hoist 7, a hydraulic power generating unit 8, a water pipe 9, an exhaust pipe 12, and so on. The hydraulic power generating unit 8 is provided with a Francis turbine 21 and a hydraulic generator 22, and is formed watertightly by a case. The hydraulic power generating unit 8 is set on the incline 6, and the hoist 7 is set to the upper part of the incline 6. The wire 14 of the hoist 7 is connected to the hydraulic power generating unit 8, so that the hydraulic power generating unit 8 is elevatable. Water supplied from an arched dam 2 falls through the water pipe 9 and supplied to the Francis turbine in the hydraulic power generating unit 8, and electricity is generated by the hydraulic generator. Generated electric power is transmitted to a machine room 17 by a cable stored in the exhaust pipe 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hydroelectric power generation facility for generating electric power using water discharged from a water storage area using a hydroelectric power generation unit.

Conventionally, various hydroelectric power generation facilities using dams have been constructed. In such hydroelectric power generation facilities, concrete and steel structure power generation buildings have been constructed on the ground and underground to accommodate water turbines, generators, and various auxiliary equipment. In constructing such a power plant, an access road to the power plant, a tunnel, and a bridge tower were constructed in consideration of equipment installation and maintenance. For example, Patent Document 1 below discloses an underground power plant.
JP-A-9-177654

  However, in steep terrain, it is not always easy to secure a site for a power plant on the ground. For this reason, there are many cases where a power plant is constructed by excavating a cavity underground, but a large amount of cost is required. In addition, it is often necessary to construct an access road, a tunnel or a bridge, which further increases the construction cost. In addition, when trying to construct a power plant downstream of a dam, the power plant may be submerged due to discharge from the dam during a flood. In this case, it is common to build the power plant at a high place so that the power plant will not be submerged, but doing so will also reduce the head that can be used for hydropower generation and reduce the amount of power generated. is there.

  Therefore, an object of the present invention is to provide a hydroelectric power generation facility that can be installed simply and at low cost without causing a drop in available head.

  A hydroelectric power generation facility according to the present invention is a hydroelectric power generation facility that performs hydroelectric power generation using water discharged from a water storage area using a hydroelectric power generation unit including a hydroelectric generator inside a casing having a watertight structure, A water guide pipe that guides the water discharged from the water storage area from the water discharge section of the water storage area to the stationary part of the turbine power generation unit disposed at a position lower than the water discharge part, and a position that is higher than the stationary part and the stationary part. And elevating means for elevating between them.

  According to this hydroelectric power generation facility, the hydroelectric power generation unit is disposed on the stationary part by the lifting means, and the water discharged from the water storage area is guided to the water turbine power generation unit disposed on the stationary part through the water discharge part by the water conduit. be able to. Thereby, a hydroelectric power generation unit converts the kinetic energy of the water discharged from the water storage area into electric energy, and generates electric power. Here, since the casing of the hydroelectric power generation unit has a watertight structure, even if the hydroelectric power generation unit itself is submerged due to a rise in the surrounding water level due to flooding or the like, the hydroelectric generator can generate power without any problem. it can. Therefore, a sufficient drop for dropping water can be secured, and the drop is not lowered. Further, the hydroelectric power generation unit can be lifted from the stationary part by the lifting means, and can be maintained and inspected on the spot. Thus, the unitized hydroelectric power generation unit is easy to handle, the hydroelectric power generation facility can be easily installed, and maintenance and inspection can be easily performed.

  Further, the hydroelectric power generation unit, the water conduit, and the elevating means are installed on the discharge side of the dam that forms the water storage area, and the water conduit may guide the water stored in the water storage area by the dam to the turbine power generation unit. . By adopting such a configuration, the space on the discharge side of the dam can be utilized, and the height of the dam can be effectively utilized as the height of water fall, ensuring the power to be generated. It is valid.

  Further, the elevating means includes an ink line and a hoist installed on the discharge side of the dam, and the hydroelectric power generation unit is movably disposed in the ink line, and a wire is connected to the hydroelectric power generation unit. It is preferable that the hydroelectric power generation unit is moved up and down by winding and unwinding of the wire by the hoist, and the stationary portion is positioned at the lowermost end portion on the ink line. By configuring in this way, when installing the hydroelectric power generation unit, the hydroelectric power generation unit can be installed by lowering the hydroelectric power generation unit to the lowest end by unwinding the wire with a hoisting machine. it can. Further, during maintenance of the hydroelectric power generation unit, the hydroelectric power generation unit can be pulled up and maintained and inspected by winding the wire with a hoisting machine. In this way, installation, maintenance and inspection of the hydroelectric power generation unit can be easily performed.

  In addition, the hydroelectric power generation facility further includes a vent pipe that communicates the inside and outside of the casing of the hydroelectric power generation unit, and the vent pipe extends to a position where the hydroelectric power generation unit is not submerged when the hydroelectric power generation unit is guided to the stationary portion. It is preferable. By adopting such a configuration, the heat generated by the hydroelectric generator in the casing can be released outside the casing through the exhaust pipe.

  Further, the vent pipe may contain a power cable connected to an output terminal for taking out the power generated by the hydroelectric generator. With this configuration, the ventilation pipe can also be used as a conduit for accommodating the power cable, so that the space efficiency is good and the power cable is protected. Moreover, the electric power generated by the hydroelectric generator can be transmitted to the outside of the hydroelectric power generation unit without leakage by the electric power cable protected in a watertight manner by the ventilation pipe.

  According to the present invention, it can be installed easily and at low cost without causing a drop in the available head.

  Hereinafter, a preferred embodiment of a hydroelectric power generation facility according to the present invention will be described in detail with reference to the drawings.

[Composition of hydroelectric power generation facilities]
FIG. 1 is a schematic diagram of a hydroelectric power generation facility 1. As shown in FIG. 1, the hydroelectric power generation facility 1 is installed on the discharge side of an arch dam 2 constructed in a V-shaped valley (not shown). The arch dam 2 is provided with a spillway gate 4 that is opened at the time of flooding to adjust the water level of the reservoir 3, and on the discharge side of the arch dam 2, the arch dam 2 and the slope of the V-shaped valley The footing 5 is provided over several stages (four stages in FIG. 1). The hydroelectric power generation facility 1 includes an ink line 6, a hoisting machine 7, a hydroelectric power generation unit 8, a water guide pipe 9, an air supply pipe 11, an exhaust pipe 12, and the like.

  The ink line 6 is provided so as to be inclined along the footing 5 from the uppermost stage 5a of the footing 5 to a stationary part 15 described later at a position slightly above the lowest water level L1. There are four rails 16 to be described later supported by anchors 13 erected.

  The hoisting machine 7 is installed on the upper part of the ink line 6 and unwinds and winds the wire 14 connected to the hydroelectric power generation unit 8.

  The hydroelectric power generation unit 8 is a device that performs hydroelectric power generation by converting the kinetic energy of falling water into electrical energy. The hydroelectric power generation unit 8 can move along the rail 16 (see FIG. 2) of the ink line 6, and in FIG. The unit 8 is installed in a stationary part 15 where the unit 8 is regularly arranged. The hydraulic power generation unit 8 is moved up and down along the ink line 6 by driving the hoisting machine 7 to wind or unwind the wire 14.

  The water conduit 9 is a conduit for dropping the water stored by the arch dam 2 and supplying the water to the hydroelectric power generation unit 8, and has an L-shaped one end 9a and an L-shaped other end 9b. is doing. Further, the arch dam 2 is formed with a water discharge hole (water discharge part) 10 for discharging water from the water storage area 3, and the L-shaped one end 9 a of the water conduit 9 is formed as a water discharge hole (water discharge part) 10. The L-shaped other end portion 9 b is connected to the hydroelectric power generation unit 8 at the stationary portion 15. The water conduit 9 extends in parallel with the ink line 6 above the ink line 6.

  A machine room 17 is installed on the footing 5 at a position slightly higher than the design flood water level L3 on the discharge side of the arch type dam 2, and the air supply pipe extends from the machine room 17 to the stationary part 15. 11 and an exhaust pipe 12 are provided. The air supply pipe 11 and the exhaust pipe 12 are ventilation pipes in the present invention, and communicate with the inside and outside of a casing 19 described later, and ventilate the inside of the casing 19 to generate heat generated in the hydroelectric power generation unit 8. This is a pipeline for escaping into the atmosphere. Each of the supply pipe 11 and the exhaust pipe 12 is connected to the hydroelectric power generation unit 8 at one end, and the other end extends to a position that is higher than the design flood water level L3 and not submerged when the hydroelectric generation unit 8 is guided to the stationary portion 15. Exist. A blower (not shown) for supplying air toward the hydroelectric power generation unit 8 and a filter (not shown) for removing dust and the like in the air are provided at the air supply port of the air supply pipe 11 in the machine room 17. It is attached. Then, by driving the blower in the machine room 17, outside air is supplied into the hydroelectric power generation unit 8 through the air supply pipe 11, and the air in the hydroelectric power generation unit 8 is exhausted to the outside through the exhaust pipe 12. ing. Further, the exhaust pipe 12 accommodates the cable 18 so as to be protected. Thus, since the exhaust pipe 12 has a role as a conduit for accommodating the cable 18, the space efficiency is also good. The cable 18 includes a power cable for transmitting power and a control cable for transmitting an ON / OFF signal and a voltage control signal for the hydroelectric generator 22. The cable 18 may be a bundle of such power cables and control cables, or may be a multi-core wire. In the machine room 17, a transformer, a circuit breaker, and the like that receive and transform the electric power transmitted from the hydroelectric power generation unit 8 through the cable 18 (see FIG. 2) are installed. A controller for outputting 22 ON / OFF signals and voltage control signals is installed. With this controller, the hydroelectric generator 22 can be controlled and monitored. In addition, it is preferable that this machine room 17 is a tower-like building suitable for ventilation, for example, a ventilation tower.

  2 is a cross-sectional view of the hydroelectric power generation unit 8, and FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. As shown in FIGS. 2 and 3, the hydroelectric power generation unit 8 has a casing 19 having a watertight structure, and a Francis turbine 21 and a hydroelectric generator 22 are provided inside the casing 19. The casing 19 is fixed to a carriage 24 that includes a roller 23. The carriage 24 is arranged with an inclination along the ink line 6, and includes a movable portion 24 a to which the roller 23 is attached, and a protruding portion 24 b that protrudes substantially parallel to the flat surface portion 6 a of the stationary portion 15. The carriage 24 is stably placed so that the overhanging portion 24b contacts the flat portion 6a of the ink line 6 in the stationary portion 15.

  The Francis turbine 21 has a spiral casing 26, and its inflow side 26 a faces the water conduit 9 and is detachably connected to the water conduit 9 by an L-shaped joint tube 27. The spiral casing 26 and the joint pipe 27 are firmly connected to each other by bolting at the flange portions 26c and 27a. Similarly, the joint pipe 27 and the water guide pipe 9 are also connected by bolting through the packing P at the flange portions 27b and 9c. The joint pipe 27 is inserted into the housing 19 and fixed in a watertight manner.

  Further, a conical outflow pipe 28 is connected to the outflow side 26b of the spiral casing 26. Further, the outflow pipe 28 is a draft for discharging water that contributes to power generation through the Francis turbine 21 to the outside. A tube (a suction pipe) 29 is connected. The draft tube 29 extends substantially parallel to the ink line 6 and discharges water from the opening 29a. The outflow pipe 28 is inserted into the housing 19 and fixed in a watertight manner.

  Such a spiral casing 26 is fixed by a support member 31 installed in the housing 19.

  The Francis turbine 21 has a runner 33 that rotates around a rotation shaft 32 and a guide vane 34 that guides the water flowing in from the water conduit 9 from the periphery of the runner 33 toward the runner 33 in the spiral casing 26. is doing.

  The rotating shaft 32 is rotatably held by a pair of bearings 36 and 37, and the hydroelectric generator 22 is installed between the bearings 36 and 37. The hydroelectric generator 22 and the bearings 36 and 37 are fixed on a pedestal 38 installed on the lower inner surface 19 a in the housing 19.

  The exhaust pipe 12 is inserted into the housing 19 and fixed in a watertight manner, and a cable 18 for transmitting electric power to the machine room 17 is accommodated inside the exhaust pipe 12. 22 output terminals 39 are electrically connected. Although not shown, the exhaust pipe 12 is formed with a flange portion (not shown) in the vicinity of the housing 19 for connecting and disconnecting each other as necessary.

  The air supply pipe 11 is connected to the housing 19 via the joint pipe 41. In other words, the air supply pipe 11 and the joint pipe 41 are fixed by bolting via the packing P at the flange portions 11a and 41a, and the joint pipe 41 is inserted into the housing 19 to be watertight. It is fixed. A blower 42 is attached to a portion of the housing 19 to which the connecting pipe 41 is connected. By driving the blower 42, air is supplied to the hydroelectric generator 22 through the air supply pipe 11 to cool the hydroelectric generator 22. Then, the air in the hydroelectric power generation unit 8 warmed by the hydroelectric generator 22 is guided to the machine room 17 through the exhaust pipe 12 and discharged in the machine room 17. At this time, since the heat generated from the cable 18 is also released by the air flow in the exhaust pipe 12, the cable 18 is also cooled.

  A drainage pump 43 is disposed on the lower inner surface 19 a of the housing 19. The drainage pump 43 is provided to discharge slight water leakage from the gap between the rotating shaft 32 of the Francis turbine 21 and the spiral casing 26 to the outside.

[How to install hydroelectric power generation facilities]
Next, the installation method of the above hydroelectric power generation facilities 1 is demonstrated.

  First, the ink line 6 is installed so that a plurality of anchors 13 are driven to stand on the inclined footing 5 and supported by the anchors 13. At this time, four rails 16 are installed. Further, a hoisting machine 7 is installed on the upper part of the ink line 6.

  Subsequently, the hydroelectric power generation unit 8 is placed on the upper part of the ink line 6. At this time, the hydroelectric power generation unit 8 is placed so that the roller 23 of the hydroelectric power generation unit 8 rides on the rail 16 of the ink line 6. Furthermore, the wire 14 of the hoisting machine 7 is connected to the hydroelectric power generation unit 8, the hoisting machine 7 is driven to unwind the wire 14, and the wire 14 is sent out. Then, the hydroelectric power generation unit 8 is lowered on the ink line 6 until the protruding portion 24 b of the carriage 24 in the hydroelectric power generation unit 8 reaches the flat surface portion 6 a of the ink line 6 in the stationary portion 15.

  When the hydroelectric power generation unit 8 reaches the flat surface portion 6a of the stationary portion 15, the L-shaped one end portion 9a of the water conduit 9 is connected to the water discharge hole (water discharge portion) 10 formed in the arch type dam 2. The water conduit 9 extends in parallel with the ink line 6 above the ink line 6. Then, in the stationary part 15, the L-shaped other end 9 b of the water guide pipe 9 is connected to the joint pipe 27 and communicated with the inflow side 26 a of the spiral casing 26 in the hydroelectric power generation unit 8. Of course, when the water conduit 9 is connected to the arch dam 2, the water storage level in the arch dam 2 is sufficiently lowered.

  Further, one end of the air supply pipe 11 is connected to the joint pipe 41 of the hydroelectric power generation unit 8 so that the air supply pipe 11 communicates with the inside of the housing 19. Further, the other end of the air supply pipe 11 is disposed in the machine room 17.

  Further, one end of the exhaust pipe 12 is connected to the hydroelectric power generation unit 8 so as to communicate with the inside of the housing 19, and the other end is disposed in the machine room 17. Further, the cable 18 is inserted into the exhaust pipe 12, and one end of the cable 18 is electrically connected to the output terminal 39 of the hydroelectric generator 22. Thereby, the electric power generated by the hydroelectric generator 22 is transmitted to the machine room 17 by the cable 18.

  As described above, the hydroelectric power generation facility 1 according to the present embodiment is provided by installing the ink line 6 on the slope on the discharge side of the arch type dam 2 and arranging the hydroelectric power generation unit 8 on the ink line 6. However, access roads, tunnels, bridges, and the like that are necessary for constructing a conventional underground power plant are not particularly required for the installation of the hydroelectric power generation facility 1. Therefore, the development cost is reduced and the construction period can be shortened. In addition, the hydroelectric power generation facility 1 can be installed on steep terrain that could not be constructed by a conventional power plant. Furthermore, a sufficient drop for dropping water can be secured. In addition, the order of installation of the ink line 6, the water guide pipe 9, the air supply pipe 11, and the exhaust pipe 12 is not limited to the above order.

[Operation of hydroelectric power generation facilities]
Next, the operation of the hydroelectric power generation facility 1 will be described.

  When the hydroelectric power generation facility 1 is operated, the water is discharged by discharging water stored in the arch type dam 2 from the arch type dam 2 through the water conduit 9. In this case, the water that has reached the water discharge hole (water discharge part) 10 can be used for hydroelectric power generation by utilizing the maintenance discharge for the purpose of maintaining the downstream river environment. The water discharged from the water discharge hole (water discharge part) 10 falls in the water guide pipe 9 and is in the spiral casing 26 in the Francis turbine 21 of the hydroelectric power generation unit 8 located at a position lower than the water discharge hole (water discharge part) 10. Washed away. Then, the water is guided to the runner 33 by the guide vanes 34 and rotates the runner 33. Further, the water is discharged out of the draft tube 29 through the outflow pipe 28. Thus, since the runner 33 rotates and the rotating shaft 32 rotates, the hydroelectric generator 22 converts the rotary motion of the rotating shaft 32 into electric power and outputs it to the output terminal 39. The electric power output to the output terminal 39 is transmitted to the machine room 17 through the cable 18. In the machine room 17, the transmitted power is transformed by a transformer or the like. Then, the transformed power is transmitted from the machine room 17 to another power facility (not shown).

  During the operation of the hydroelectric power generation facility 1, in order to cool the hydroelectric generator 22, the blower or the blower 42 installed at the air supply port of the air supply pipe 11 is driven, and the inside of the casing 19 is supplied through the air supply pipe 11. The air is supplied to the air and the heat generated by the hydroelectric generator 22 is released into the atmosphere through the exhaust pipe 12. At this time, the cable 18 is also cooled. Thereby, the temperature rise in the housing | casing 19 can be suppressed and the normal driving | operation of the hydroelectric generator 22 can be maintained.

  Here, the hydroelectric power generation facility 1 utilizes the space on the discharge side of the arched dam 2 and can take a sufficiently large difference in height when water falls through the conduit 9. Yes. Therefore, sufficient kinetic energy can be imparted to the dropped water, which is effective in securing the power to be generated. Further, since the hydroelectric power generation unit 8 includes the hydraulic power generator 22 inside the watertight casing 19, even if the hydroelectric power generator 22 is submerged, the hydroelectric power generator 22 gets wet and interferes with power generation. Never come. That is, by discharging water from the spillway gate 4 of the arch type dam 2, the water level rises to the position of the water discharge level L2, and the water level rises to the design flood water level L3 assumed at the time of flooding, Even if the hydroelectric power generation unit 8 is submerged, the hydroelectric generator 22 can generate power without any trouble. In addition, since the machine room 17 is built in the position higher than the design flood water level L3, it will not be submerged.

[Maintenance of hydropower facilities]
Next, maintenance of the hydroelectric power generation facility 1 will be described. Maintenance of the hydroelectric power generation facility 1 is performed when the water level on the discharge side of the arch type dam 2 is the lowest water level L1.

  First, the hydroelectric power generation unit 8 is removed from the water conduit 9, the air supply pipe 11, and the exhaust pipe 12 to release bolt tightening of the flange portions 26 c, 27 a, 27 b, 9 c, 41 a, 11 a and the like. Then, the hoisting machine 7 is driven to wind the wire 14, and the hydraulic power generation unit 8 is pulled up along the ink line 6. When the hydroelectric power generation unit 8 reaches the upper part of the ink line 6, the hydroelectric power generation unit 8 can be moved on the spot or to another place to perform maintenance / inspection of the hydroelectric power generation unit 8. In addition, maintenance and inspection are also performed on the water conduit 9, the air supply pipe 11, the exhaust pipe 12, and the ink line 6.

  In this way, if the above-described removal work is performed during maintenance of the hydroelectric power generation facility 1, the hydroelectric power generation unit 8 is pulled up from the stationary portion 15 along the ink line 6 by winding the hoisting machine 7. Therefore, the hydroelectric power generation unit 8 can be easily maintained and inspected. In the case of a conventional power plant, for maintenance, it was necessary to close the road on the road and to perform work after deploying a large machine such as a large crane on the site. However, in the hydroelectric power generation facility 1, the maintenance can be performed very easily, and it is not necessary to perform a maintenance work with a number of workers getting down to the lowermost end (stationary portion) 15. Therefore, the maintenance cost can be reduced and the maintenance period can be shortened, and the safety of the maintenance work can be improved.

  As mentioned above, although preferred embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to the said embodiment.

  For example, in the said embodiment, although the water conduit 9 was connected to the water discharge hole (water discharge part) 10 formed in the arch type dam 2, it is not restricted to this, A water conduit with a siphon structure may be sufficient. Moreover, although the water conduit 9 was arrange | positioned along the ink line 6, you may arrange | position not only this but extending vertically, for example.

  Moreover, in the said embodiment, although the ink line 6 was installed in the footing 5 so that it might incline, not only this but you may install in the arch type dam 2, for example.

  Furthermore, although not shown, in the above embodiment, a hydraulic pipe used for changing the angle of the guide vane 34 of the Francis turbine 21 may be connected to the Francis turbine 21 from the machine chamber 17 through the exhaust pipe 12.

  Moreover, in the said embodiment, although the Francis turbine 21 was employ | adopted for the hydroelectric power generation unit 8, it is not restricted to this, For example, a Kaplan turbine, a diagonal flow turbine, etc. may be sufficient.

  Moreover, in the said embodiment, although the two blowers of the blower 42 in the hydroelectric power generation unit 8 and the blower attached to the air supply port of the air supply pipe 11 were provided, it is not necessary to provide both blowers, for example, Only one of them may be provided. Further, the air blowing direction for cooling the hydroelectric generator 22 and the cable 18 may be a direction opposite to the direction in the above embodiment, and in this case, the direction of the blower 42 and the like is reversed.

  In the above embodiment, the four rails 16 are provided in the ink line 6. However, the number of the rails 16 provided in the ink line 6 may be appropriately changed according to the width of the ink line 6.

  Further, when the hydroelectric power generation unit 8 is constantly submerged and operated, and when the hydroelectric generator 22 can be cooled by surrounding water, the air supply pipe 11 and the blower 42 are not particularly necessary. In this case, the casing 19 of the hydroelectric power generation unit 8 preferably has cooling fins inside.

It is the schematic which shows one Embodiment of the hydroelectric power generation facility which concerns on this invention. It is sectional drawing of the hydroelectric power generation unit shown in FIG. It is sectional drawing which follows the III-III line | wire shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Hydroelectric power generation facility, 2 ... Arch type dam, 3 ... Water storage area, 6 ... Incline, 7 ... Hoisting machine, 8 ... Hydroelectric power generation unit, 9 ... Water conduit, 10 ... Water discharge hole (water discharge part), 11 ... Air supply pipe, 12 ... exhaust pipe, 14 ... wire, 15 ... stationary part, 18 ... cable, 19 ... housing, 21 ... Francis turbine, 22 ... hydroelectric generator, 26 ... spiral casing, 32 ... rotating shaft.

Claims (5)

A hydroelectric power generation facility that performs hydroelectric power generation using water discharged from a water storage area using a hydroelectric power generation unit equipped with a hydroelectric generator inside a casing having a watertight structure,
A water conduit that guides water discharge from the water storage area from a water discharge part of the water storage area to a stationary part of the water turbine power generation unit disposed at a position lower than the water discharge part;
A hydroelectric power generation facility comprising elevating means for elevating and lowering the hydroelectric power generation unit between a position higher than the stationary part and the stationary part. The hydroelectric power generation unit, the water conduit, and the lifting means are installed on the discharge side of a dam that forms the water storage area,
The hydroelectric power generation facility according to claim 1, wherein the water guide pipe guides water stored in the water storage area by the dam to the hydroelectric power generation unit. The elevating means comprises an ink line and a hoist installed on the discharge side of the dam,
The hydroelectric power generation unit is movably disposed in the ink line, and a wire is connected to the hydroelectric power generation unit,
By the winding and unwinding of the wire by the hoisting machine, the hydroelectric power generation unit moves up and down,
The hydroelectric power generation facility according to claim 2, wherein the stationary portion is positioned at a lowermost end portion of the ink line. A vent pipe communicating between the inside and outside of the casing of the hydroelectric power generation unit;
The hydroelectric power generation facility according to any one of claims 1 to 3, wherein the vent pipe extends to a position where the hydroelectric power generation unit is not submerged when the hydroelectric power generation unit is guided to the stationary portion.   5. The hydroelectric power generation facility according to claim 4, wherein a power cable connected to an output terminal for taking out electric power generated by the hydroelectric generator is accommodated in the vent pipe.

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