JP2018196165A - Sealing oil control system for rotating electrical machines - Google Patents

Abstract

A sealing oil control system for a rotating electrical machine capable of setting a differential pressure between an enclosed gas pressure and a sealing oil pressure with a simple configuration and improving reliability and maintainability. In a sealing oil control system for a rotating electrical machine having a sealing oil supply circuit SC for supplying sealing oil to a sealer 3 of a shaft sealing part FS in a rotating electrical machine 1 in which hydrogen gas is sealed, rather than the shaft sealing part FS. Sealing oil is supplied to the sealer 3 of the shaft seal FS from the surge tank 17 provided above, and the hydrogen gas pressure in the rotating electrical machine 1 is sealed by utilizing the head pressure difference between the shaft seal FS and the surge tank 17. The differential pressure of the oil pressure was kept at a predetermined value. [Selection] Figure 1

Description

  The present invention relates to a seal oil control system for supplying seal oil to a shaft seal portion of a rotating electrical machine such as a hydrogen cooled turbine generator enclosing hydrogen gas.

In the conventional sealing oil control system, the sealing oil processing apparatus is equipped with an AC pump (ordinary sealing oil pump) and a DC pump (emergency sealing oil pump), and a sealing oil filter and differential pressure adjustment are provided in the sealing oil supply circuit. A valve is used. For this reason, when switching from the AC sealing oil pump to the DC sealing oil pump, there is a risk that hydrogen gas leaks due to a momentary decrease in the sealing oil pressure due to a delayed response of the valve.
Conventionally, the oil pressure fluctuation is relatively large with respect to the gas pressure fluctuation because the pressure difference is ensured by adjusting the amount of sealing oil with the differential pressure regulating valve.

JP 59-185136 (see FIG. 2)

  In the conventional sealing oil control system, the amount of sealing oil is adjusted by the differential pressure adjustment valve, and the differential pressure between the hydrogen gas pressure in the generator and the sealing oil pressure is secured. Hydraulic pressure fluctuation was large. Further, when the AC pump is switched to the DC pump, there is a risk that hydrogen gas leaks due to a momentary decrease in the sealing oil pressure due to a delay in response of the differential pressure regulating valve.

  The sealing oil control system for a rotating electrical machine according to the present invention is the sealing oil control system for a rotating electrical machine provided with a sealing oil supply circuit that supplies sealing oil to a sealer of a shaft seal portion in the rotating electrical machine in which the sealed gas is sealed. A surge tank containing sealing oil is provided above the shaft seal, and the sealing oil is supplied from the surge tank to the sealer.

  According to this invention, sealing oil is supplied from a surge tank provided above the shaft seal portion to the seal of the shaft seal portion, and the head pressure difference between the shaft seal portion and the surge tank is utilized to provide the inside of the rotating electrical machine. Since the differential pressure between the sealed gas pressure and the sealing oil pressure is maintained at a predetermined value, the differential pressure between the sealed gas pressure and the sealed oil pressure can be set with a simple configuration, and the reliability and maintainability are improved.

It is a systematic diagram which shows the sealing oil control system of the rotary electric machine in Embodiment 1 which concerns on this invention. It is a systematic diagram which shows the sealing oil control system of the rotary electric machine in Embodiment 2 which concerns on this invention. It is a systematic diagram which shows the sealing oil control system of the rotary electric machine in Embodiment 3 which concerns on this invention.

Embodiment 1 FIG.
Embodiment 1 according to the present invention will be described with reference to FIG. FIG. 1 is a system diagram showing a sealing oil control system for a rotating electrical machine in the first embodiment.
In FIG. 1, a rotating electrical machine (for example, a hydrogen-cooled turbine generator) 1 includes a rotating shaft 2 and a sealer 3 in which hydrogen gas is sealed. The sealing oil discharged from the sealer 3 is introduced into a loop seal tank 4 provided for temporary retention through a sealing oil drain pipe 6.

Sealing oil supplied from a main oil tank (not shown) is supplied to the sealing oil supply device 5 through a pipe 9. The sealing oil supply device 5 includes a sealing oil purification tank 7 provided with an oil level adjustment valve 8 for maintaining the oil level constant, and a normal AC sealing to which the sealing oil purified by the sealing oil purification tank 7 is supplied. An emergency DC sealing oil pump 13 provided in parallel with the oil pump 11 is provided.
Further, a check valve 10 for preventing back flow from occurring inside the sealing oil drain pipe 6, a pressure adjusting valve 12 for maintaining the outlet pressure of the AC sealing oil pump 11 constant, and an exhaust from the AC sealing oil pump 11. Check valve 14 for preventing the back flow of the sealed seal oil, check valve 15 for preventing the back flow of the seal oil discharged from the DC seal oil pump 13, and a filter for removing foreign matter from the seal oil 16 is provided.

  A surge tank 17 for securing a differential pressure between the hydrogen gas pressure and the sealing oil pressure is provided on the upper portion of the rotating electrical machine 1. The surge tank 17 is provided with an oil level adjustment valve 18 for maintaining the oil level of the sealing oil in the surge tank 17 constant, and the sealing oil that has passed through the filter 16 that removes foreign matter from the sealing oil circulates the sealing oil. It is supplied to the surge tank 17 via the pipe 19 in the route RC. The sealing oil exiting the surge tank 17 is supplied to the sealer 3 via the sealing oil supply pipe 20 in the sealing oil supply path SC. The rotating electrical machine 1 in which hydrogen gas is sealed and the gas phase portion 17 g of the surge tank 17 are connected by a connecting pipe 21. A pipe 22 for returning the sealing oil from the loop seal tank 4 to a main oil tank (not shown) of the rotating shaft lubricating oil, a vacuum pump 25 for evacuating the sealing oil purification tank 7, and an outdoor discharge pipe 26 are provided. ing.

  Next, the operation will be described. The hydrogen gas sealed in the gas filling portion GF inside the rotating electrical machine 1 is prevented from being discharged into the atmosphere at the shaft seal portion FS, and the discharge path to the atmosphere is supplied with sealing oil in the sealer 3. It is sealed by a sealing oil circulating in a sealing oil circuit including the path SC. The sealing oil is supplied from a main oil tank (not shown) of the rotating shaft lubricating oil to the sealing oil purification tank 7 of the sealing oil supply device 5. Further, the sealing oil pushed out by the AC sealing oil pump 11 is adjusted by the pressure adjusting valve 12 so as to be a constant value. The pressure-adjusted sealing oil is supplied to the surge tank 17 and the sealer 3 through the check valve 14 and the sealing oil filter 16, and is discharged through the loop seal tank 4. A DC sealing oil pump 13 is installed in the sealing oil circuit as a backup for the AC sealing oil pump 11.

  The sealing oil is supplied to the sealer 3 at a supply pressure that is a certain value higher than the hydrogen gas pressure. In the conventional sealing oil system, since a certain differential pressure is secured by installing a differential pressure regulating valve on the downstream side of each of the AC sealing oil pump and the DC sealing oil pump, the amount of sealing oil supplied to the sealer 3 The oil pressure fluctuation increases with respect to the gas pressure fluctuation. Further, when the AC sealing oil pump 11 is switched to the DC sealing oil pump 13, there is a risk that hydrogen gas leaks due to a momentary decrease in the sealing oil pressure due to a delayed response of the valve.

  On the other hand, in the sealing oil control system of the present invention, by applying the surge tank 17 provided above the rotating electrical machine 1, the sealing oil pressurized by the head pressure is always supplied to the sealer 3, The conventional differential pressure adjustment valve is not required. In addition to the sealing oil supply pipe 20, the surge tank 17 is connected to a connecting pipe 21 for detecting the pressure of the hydrogen gas sealed in the rotating electrical machine 1, and the sealing oil is interlocked with the change in the hydrogen gas pressure. The pressure also changes.

  By applying the surge tank 17 as described above, the differential pressure regulating valve can be omitted and the possibility of valve failure is reduced, so that the system reliability and maintainability are improved. Further, the installation of the surge tank 17 enables the sealing oil to be supplied without instantaneously reducing the sealing oil pressure when the AC sealing oil pump 11 is switched to the DC pump 13.

As shown in FIG. 1, the sealing oil control system for a rotating electrical machine according to Embodiment 1 of the present invention seals a shaft seal FS in a rotating electrical machine 1 such as a hydrogen-cooled turbine generator in which a sealed gas made of hydrogen gas is sealed. In the sealing oil control system for a rotating electrical machine provided with a sealing oil supply circuit SC for supplying sealing oil to the vessel 3, a surge tank 17 is provided above the shaft sealing portion FS of the rotating electrical machine 1, and the shaft sealing portion FS and the surge tank 17 are provided. The differential pressure between the hydrogen gas pressure and the sealing oil pressure in the rotating electrical machine is maintained at a constant predetermined value by utilizing the head pressure difference.
With this configuration, sealing oil is supplied from the surge tank 17 provided above the shaft seal portion FS to the sealer 3 of the shaft seal portion FS, and the head pressure difference between the shaft seal portion FS and the surge tank 17 is utilized. Since the differential pressure between the sealed gas pressure and the sealing oil pressure at the gas filling portion GF in the rotating electrical machine 1 is maintained at a predetermined value, the differential pressure between the sealed gas pressure and the sealing oil pressure is adjusted by adjusting the sealing oil pressure from the sealing oil pump. The differential pressure between the sealed gas pressure and the sealed oil pressure can be set with a simple configuration that eliminates the operating elements such as the differential pressure adjusting valve for setting the pressure, and the reliability and maintainability are improved.
That is, the installation of the surge tank 17 eliminates the need for a differential pressure adjustment valve that sets the differential pressure between the sealed gas pressure and the sealing oil pressure, and eliminates the risk of valve failure. improves. Further, when the DC pump is started, the sealing oil is supplied without instantaneously decreasing the sealing oil pressure.

The sealing oil control system for a rotating electrical machine according to Embodiment 1 of the present invention is configured so that, in the configuration of the previous section, the sealing oil that communicates with the bottom of the surge tank 17 and is accommodated in the surge tank 17 as shown in FIG. A supply path SC for supplying to the sealer 3 is provided, and a circulation path RC for circulating the seal oil discharged from the sealer 3 to the surge tank 17 is provided.
With this configuration, the differential pressure between the sealed gas pressure and the sealing oil pressure can be set with a simple configuration, improving the reliability and maintainability, and the sealing of the rotating electrical machine that can perform the sealing oil supply and circulation operations accurately. An oil control system can be obtained.

The sealing oil control system for a rotating electrical machine according to the first embodiment of the present invention is provided with a sealing oil purification tank 7 for purifying the sealing oil in the circulation path RC as shown in FIG. It is characterized by.
With this configuration, it is possible to set the differential pressure between the sealed gas pressure and the sealing oil pressure with a simple configuration, improving reliability and maintainability, accurately performing the sealing oil supply operation and the circulation operation, and sealing. It is possible to obtain a sealing oil control system for a rotating electrical machine that can reliably perform an oil purification action.

The sealing oil control system for a rotating electrical machine according to Embodiment 1 of the present invention is the height of the oil level of the sealing oil accommodated in the surge tank 17 as shown in FIG. An oil level adjusting valve 18 for adjusting the pressure is provided.
With this configuration, it is possible to obtain a sealing oil control system for a rotating electrical machine that can perform the differential pressure setting operation by the surge tank 17 more accurately.

The sealing oil control system for a rotating electrical machine according to Embodiment 1 of the present invention is the sealed gas comprising the gas phase portion 17g of the surge tank 17 and hydrogen gas as shown in FIG. It is characterized in that the sealed gas filling portion GF of the rotating electrical machine, which is sealed, is connected by a connecting pipe 21 to communicate with each other. That is, this is characterized in that the pressure of the sealed gas sealed in the rotating electric machine is detected.
With this configuration, it is possible to obtain a sealing oil control system for a rotating electrical machine that can more reliably perform the differential pressure setting operation by the surge tank 17.

Embodiment 2. FIG.
A second embodiment according to the present invention will be described with reference to FIG. FIG. 2 is a system diagram showing a sealing oil control system for a rotating electrical machine in the second embodiment.
In the second embodiment, a differential pressure correction adjusting valve 23 is installed between the surge tank 17 and the supply pipe 20. The differential pressure correcting adjustment valve 23 uses the head pressure difference between the shaft seal portion FS of the rotating electrical machine 1 and the surge tank 17 by the surge tank 17 provided above the shaft seal portion FS. In the apparatus in which the differential pressure between the hydrogen gas pressure and the sealing oil pressure is maintained at a predetermined value, an adjustment operation is performed to correct the differential pressure so as to better match the required value.
By setting it as such a structure, when switching from an AC sealing oil pump to a DC sealing oil pump, sealing oil can be continuously supplied without a hydraulic pressure fluctuation. In addition, since a constant sealing oil differential pressure can be ensured even when the power supply is lost, a safer and more reliable system than the first embodiment can be constructed.

The sealing oil control system for a rotating electrical machine according to the second embodiment of the present invention includes a shaft between the surge tank 17 and the shaft sealing portion FS as shown in FIG. A differential pressure correction adjusting valve 23 is provided that corrects the differential pressure set by the surge tank 17 provided above the sealing portion FS and adjusts the differential pressure to a required value.
With this configuration, it is possible to obtain a sealing oil control system for a rotating electrical machine that can perform the differential pressure setting operation by the surge tank 17 more accurately.

Embodiment 3 FIG.
A third embodiment according to the present invention will be described with reference to FIG. FIG. 3 is a system diagram showing a sealing oil control system for a rotating electrical machine in the third embodiment.
In this third embodiment, a surge is generated by installing a plurality of surge tank units 17A and 17B in parallel above the shaft seal portion FS in the rotating electrical machine 1 as equivalent to the surge tank 17 in the first embodiment. The function of the tank 17 is combined with the function of the sealed oil purification tank.

The sealing oil supplied from the main oil tank (not shown) through the supply pipe 9 is divided into left and right parts and supplied to the two surge tank units 17A and 17B. The surge tank units 17A and 17B are provided with solenoid valves 241 to 244, respectively, and perform the sealing oil supply operation to the rotating electrical machine 1 by controlling these solenoid valves 241 to 244.
The bottoms of the surge tank units 17A and 17B are communicated with the sealer 3 of the shaft seal FS so as to supply the sealing oil through the solenoid valves 241 and 244 through the sealing oil supply pipe 20 of the supply path SC. Further, the gas phase portion 17g of the surge tank units 17A and 17B and the gas filling portion GF of the rotating electrical machine 1 are connected by a connecting pipe 21 via electromagnetic valves 242 and 243. Then, the gas phase portion 17g of the surge tank units 17A and 17B and the outdoor discharge pipe 26 are communicated as necessary via the vacuum pump 25 by the electromagnetic valves 242 and 243.
Such a configuration eliminates the need for the sealing oil purification tank 7, the regular sealing oil pump 11, the pressure adjustment valve 12, and the like used in the first embodiment, thereby reducing costs.

  Here, the surge tank 17 is configured by installing a plurality of surge tank units 17A and 17B in parallel, and the surge tank units 17A and 17B are selectively operated. The operation modes of the surge tank units 17A and 17B are controlled by electromagnetic valves 241 to 244.

In the oil supply operation state of the surge tank unit 17A that supplies the sealing oil from the surge tank unit 17A to the sealer 3, the solenoid valve 241 seals the seal oil from the surge tank unit 17A through the seal oil supply pipe 20 of the supply path SC. The seal oil discharged from the sealer 3 is fed from the oil return pipe 22 to the main oil tank (not shown) via the seal oil drain pipe 6 and the loop seal tank 4. The The surge tank unit 17A is supplied with sealing oil from a main oil tank (not shown) through the supply pipe 9 and the oil level adjustment valve 18A. Further, the gas phase portion 17g of the surge tank unit 17A communicates with the gas filling portion GF of the rotating electrical machine 1 through the electromagnetic valve 243.
In the oil supply operation state of the surge tank unit 17A, the surge tank unit 17B is in the sealed oil purification state, and the gas phase portion 17g is communicated with the vacuum pump 25 via the electromagnetic valve 242, and the vaporized component of the sealed oil is released outdoors. The pipe 26 is diffused into the atmosphere and the sealing oil is purified.

On the other hand, in the oil supply operation state of the surge tank unit 17B that supplies the sealing oil from the surge tank unit 17B to the sealer 3, the solenoid valve 244 is connected to the sealing oil supply pipe 20 in the supply path SC from the surge tank unit 17B. The seal oil discharged from the sealer 3 is supplied from the oil return pipe 22 via the seal oil drain pipe 6 and the loop seal tank 4 to the main oil tank (not shown). To be sent to. The surge tank unit 17B is supplied with sealing oil from a main oil tank (not shown) through the supply pipe 9 and the oil level adjustment valve 18B. Further, the gas phase portion 17g of the surge tank unit 17B is communicated with the gas filling portion GF of the rotating electrical machine 1 through the electromagnetic valve 242.
In the oil supply operation state of the surge tank unit 17B, the surge tank unit 17A is in the sealed oil purification state, and the gas phase portion 17g is communicated with the vacuum pump 25 via the electromagnetic valve 243 so that the vaporized component of the sealed oil is discharged outdoors. The pipe 26 is diffused into the atmosphere and the sealing oil is purified.

The oil supply operation state of the surge tank unit 17A and the oil supply operation state of the surge tank unit 17B are switched to the oil supply operation state of the surge tank unit 17B after the oil supply operation state of the surge tank unit 17A continues for a predetermined time. The oil supply operation state is selectively switched between the surge tank unit 17A and the surge tank unit 17B so that the operation is switched to the oil supply operation state of the surge tank unit 17A after the oil supply operation state of 17B continues for a predetermined time.
Such selective switching operation of the refueling operation state between the surge tank unit 17A and the surge tank unit 17B is performed by switching the solenoid valves 241 to 244 by sequence control executed by a program as software in information processing means such as a microcomputer. It can be realized by controlling.

As shown in FIG. 3, the sealing oil control system for a rotating electrical machine in Embodiment 3 according to the present invention seals a shaft seal FS in a rotating electrical machine such as a hydrogen-cooled turbine generator in which a sealed gas composed of hydrogen gas is sealed. In the sealing oil control system for a rotating electrical machine having a sealing oil supply circuit SC for supplying sealing oil to the vessel 3, a surge tank 17 is provided above the shaft sealing portion FS of the rotating electrical machine, and the shaft sealing portion FS and the surge tank 17 are provided. The pressure difference between the hydrogen gas pressure in the rotating electrical machine and the sealing oil pressure is maintained at a constant predetermined value by using the head pressure difference of the plurality of surge tank units 17A, 17B is provided in parallel, and a plurality of the surge tank units 17A and 17B are selectively operated.
With this configuration, by selectively operating a plurality of surge tank units 17A and 17B, the surge tank units 17A and 17B can also function as a sealed oil purification tank, simplifying the configuration and reducing costs. A sealing oil control system for a rotating electric machine can be obtained.

The sealing oil control system for a rotating electrical machine according to Embodiment 3 of the present invention is accommodated in the first surge tank unit 17A of the plurality of surge tank units 17A, 17B as shown in FIG. The first valve device comprising an electromagnetic valve 241 for supplying the sealed oil to the sealer 3 is provided, and the gas phase portion 17g formed in the second surge tank unit 17B of the plurality of surge tank units 17A, 17B. Is provided in the first surge tank unit 17A of the plurality of surge tank units 17A, 17B. The second valve device is composed of an electromagnetic valve 242 communicating with the vacuum pump 25 for exhaust gas. Valve device comprising a solenoid valve 243 communicating the gas phase portion 17g with the vacuum pump 25 for exhausting And a fourth valve device comprising an electromagnetic valve 244 for supplying the sealing oil stored in the second surge tank unit 17B of the plurality of surge tank units 17A, 17B to the sealer 3. And
With this configuration, it is possible to obtain a sealing oil control system for a rotating electrical machine that can accurately perform selective operation in the plurality of surge tank units 17A and 17B.

In the sealing oil control system for a rotating electrical machine according to Embodiment 3 of the present invention, the first to fourth valve devices including the electromagnetic valves 241 to 244 are used as software in information processing means such as a microcomputer. It is operated by sequence control executed by the program.
With this configuration, it is possible to obtain a sealing oil control system for a rotating electrical machine capable of accurately performing switching between a sealing oil supply operation function and a purification function by sequence control.

In the sealing oil control system for a rotating electrical machine according to Embodiment 3 of the present invention, the sealing oil is supplied from the first surge tank unit configured by the surge tank unit 17A to the sealer 3 in any one of the configurations in the preceding three items. The oil supply operation state of the first surge tank unit to be supplied and the oil supply operation state of the second surge tank unit that supplies the seal oil from the second surge tank unit constituted by the surge tank unit 17B to the sealer 3 are: After the refueling operation state of the first surge tank unit composed of the surge tank unit 17A continues for a predetermined time, the refueling operation state of the second surge tank unit composed of the surge tank unit 17B is switched to the surge tank unit. The refueling operation state of the second surge tank unit comprised of 17B continues for a predetermined time After that, the oil supply operation state is selectively switched between the surge tank unit 17A and the surge tank unit 17B so as to be switched to the oil supply operation state of the first surge tank unit composed of the surge tank unit 17A. To do.
With this configuration, the oil supply operation state of the first surge tank unit composed of the surge tank unit 17A and the second surge tank unit composed of the surge tank unit 17B is alternately switched every predetermined period to seal the oil. Therefore, it is possible to obtain a sealing oil control system for a rotating electrical machine that can accurately perform a refueling operation function and a purification function.

In the sealing oil control system for a rotating electrical machine according to Embodiment 3 of the present invention, the second valve device 242 is the first surge in the third valve device 243 as shown in FIG. The gas phase portion 17g formed in the second surge tank unit 17B is replaced with the sealed gas filling portion of the rotating electrical machine in response to the operation of communicating the gas phase portion 17g formed in the tank unit 17A with the vacuum pump 25 for exhaust. The third valve device 243 communicates with the vacuum pump 25 for evacuating the gas phase portion 17g formed in the second surge tank unit 17B of the second valve device 242. The gas phase portion 17g formed in the first surge tank unit 17A is operated so as to communicate with the sealed gas filling portion GF of the rotating electric machine according to the operation to be performed. With this configuration, the sealing oil control system for a rotating electrical machine that can accurately perform selective operation including the communication action between the gas phase portion 17g of the plurality of surge tank units 17A and 17B with the sealed gas filling portion GF of the rotating electrical machine. Can be obtained.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

DESCRIPTION OF SYMBOLS 1 Rotary electric machine, 2 Rotating shaft, 3 Sealing device, 4 Loop seal tank, 5 Sealed oil processing device, 6 Sealed oil drainage pipe, 7 Sealed oil purification tank, 8 Oil level adjustment valve, 9 Supply piping from main oil tank, 10 Check Valve, 11 AC Sealed Oil Pump, 12 Pressure Regulating Valve, 13 DC Sealed Oil Pump, 14 Check Valve, 15 Check Valve, 16 Sealed Oil Filter, 17 Surge Tank, 17A, 17B Surge Tank Unit, 17g Surge Tank gas phase section, 18, 18A, 18B Oil level adjustment valve, 19 supply pipe, 20 sealed oil supply pipe, 21 connection pipe, 22 oil return pipe, 23 differential pressure correction adjustment valve, 24, 241 to 244 solenoid valve, 25 Vacuum pump, 26 Outdoor discharge tube.

Claims (9)

  In a sealing oil control system for a rotating electrical machine having a sealing oil supply circuit for supplying sealing oil to a sealer for a shaft sealing portion in a rotating electrical machine sealed with a sealed gas, a surge containing sealing oil above the shaft sealing portion A sealing oil control system for a rotating electric machine, wherein a tank is provided and sealing oil is supplied from the surge tank to the sealer.   A supply path that communicates with the bottom of the surge tank and supplies the sealing oil contained in the surge tank to the sealer and a circulation path that circulates the seal oil discharged from the sealer to the surge tank is provided. The sealing oil control system for a rotating electrical machine according to claim 1.   The sealing oil control system for a rotating electrical machine according to claim 2, wherein a sealing oil purification tank for purifying the sealing oil is provided in the circulation path.   4. The sealing oil control for a rotating electrical machine according to claim 1, further comprising an oil level adjustment valve that adjusts a height of an oil level of the sealing oil accommodated in the surge tank. 5. system.   5. The rotation according to claim 1, further comprising a communication pipe that communicates a gas phase portion of the surge tank and a sealed gas filling portion of the rotating electrical machine in which a sealed gas is sealed. Electric seal oil control system.   The sealing oil control system for a rotating electrical machine according to claim 1, wherein a differential pressure correction adjusting valve is provided between the surge tank and the shaft seal portion.   The sealing oil control system for a rotating electrical machine according to claim 1, wherein a plurality of surge tank units are provided in parallel as the surge tank, and the plurality of surge tank units are selectively operated.   A first valve device is provided for supplying the sealing oil contained in the first surge tank unit in the plurality of surge tank units to the sealer, and is formed in the second surge tank unit in the plurality of surge tank units. A gas phase portion formed in the first surge tank unit of the plurality of surge tank units, wherein a second valve device for communicating the gas phase portion with a vacuum pump for exhausting is provided. Is provided with a third valve device that communicates with a vacuum pump for exhausting, and a fourth valve device that supplies seal oil contained in the second surge tank unit of the plurality of surge tank units to the sealer The sealing oil control system for a rotating electrical machine according to claim 7, wherein:   The second valve device is formed in the second surge tank unit in response to an operation of communicating a gas phase portion formed in the first surge tank unit in the third valve device with a vacuum pump for exhaust. The third gas valve unit is operated so as to communicate with the sealed gas filling portion of the rotating electrical machine, and the third valve device is a gas phase unit formed in the second surge tank unit in the second valve device. 9. The gas phase portion formed in the first surge tank unit is operated so as to communicate with a sealed gas filling portion of the rotating electric machine in response to an operation communicating with a vacuum pump for exhaust. A sealing oil control system for a rotating electric machine according to claim 1.

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