JP2622043B2 - Turbine generator cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a turbine generator, and more particularly, to optimally controlling the temperature in a stator frame and the output of the turbine generator when the cooling device fails and becomes unusable. The present invention relates to a cooling device for a turbine generator.

[0002]

2. Description of the Related Art As a means for effectively cooling the inside of a turbine generator, air or hydrogen gas is used as a cooling medium, and the heat taken by the air or hydrogen gas is contained in a stator frame of the turbine generator. Air or hydrogen gas cooler.

FIG. 3 shows an example of the structure of such a turbine generator. 3, a stator core 2 on which a stator winding 3 is wound is mounted on an inner surface of a stator frame 1 with a predetermined gap. In this case, the stator frame 1 has a welded structure having mechanical strength in order to hold heavy objects of the stator core 2 and the stator winding 3.

[0004] In the gap between the stator frame 1 and the stator core 2,
A plurality of partition plates 4 for forming a cooling air passage in the turbine generator in the circumferential direction and dividing the cooling air passage into a suction portion and a discharge portion are arranged at appropriate intervals in the axial direction. Further, in order to make the temperature of each part in the machine uniform, a plurality of ventilation pipes 5 are arranged in the axial direction through the peripheral surface of each partition plate 4.

On the other hand, fans 7 are attached to both ends of a shaft of a rotor 6 provided in a hollow portion of the stator core 2, and the air or hydrogen gas as a cooling medium in the machine is removed by the fans 7. The iron core 2, the stator winding 3 and the rotor 6 are circulated. At the four corners of the stator frame 1, vertical air or hydrogen gas coolers 8 are arranged to cool the air or hydrogen gas from which heat generated from the stator core 2, the stator windings 3 and the rotor 6 has been removed. Thus, circulation in a closed loop is continuously performed. In this case, the air or hydrogen gas cooler 8 exchanges heat with the cooling water.

In the turbine generator having such a configuration, the air or hydrogen gas coolers 8 are arranged at the four corners of the stator frame 1 and formed so that the temperature of each part in the machine becomes uniform in the cooling air passage. If one of the four sets of air or hydrogen gas coolers 8 leaks due to a broken tube or the like and becomes unusable, the temperature at this corner will rise, Temperature of each part becomes uneven. For this reason,
While monitoring the temperature of each part in the machine as well as the temperature of each part in the machine and the vibration of the rotor 6 as well as the temperature of the unusable part, the turbine generator is controlled so that the temperature of each part in the machine is equal to or less than a specified value and is uniform. The operator has manually lowered the output.

[0007]

As described above, in the conventional cooling structure of a turbine generator, one set of air or hydrogen gas coolers 8 is arranged at each of the four corners of the stator frame 1. If the air or hydrogen gas cooler 8 becomes unusable, the temperature inside the machine becomes uneven, and the temperature at the corner where the air becomes unusable exceeds the specified value. While monitoring the temperature of each part and the vibration of the rotor 6, there is not only the inconvenience that the output of the turbine generator must be reduced so that the temperature of each part in the machine is equal to or less than a specified value and is even. There is a disadvantage that complicated and difficult operations have to be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to measure the temperature of each part by using a temperature sensor provided at each part in the machine, and it is impossible to use one of a plurality of coolers arranged in a stator frame. The present invention provides a cooling device for a turbine generator that has a function of controlling the reduction of the output of the turbine generator to a minimum in a case where the load on the operator is greatly reduced. .

[0009]

According to the present invention, a cooling medium such as air or hydrogen gas is supplied to a ventilation passage formed in a stator frame, a stator and a rotor in a machine by using a cooling medium as a rotating shaft. In a cooling device for a turbine generator, a plurality of coolers for circulating by a fan attached thereto and cooling the cooling medium facing the ventilation path in the stator frame are arranged. Temperature sensors provided at the inlet and outlet of the cooler, and temperature difference calculation means for receiving the temperature detection signals detected by the temperature sensors and obtaining the temperature difference between the inlet and outlet of each cooler, Determining means for determining whether or not the cooler has a defect based on the temperature difference obtained by the calculating means; a determination signal is input from the determining means; That there is A configuration that includes a display unit for displaying.

In addition, a cooling medium such as air or hydrogen gas is circulated through ventilation passages formed in a stator frame, a stator and a rotor in the machine by a fan mounted on a rotating shaft, and is circulated in the stator frame. In a cooling device for a turbine generator comprising a plurality of sets of coolers for cooling the cooling medium facing the ventilation path, a temperature sensor provided at an inlet and an outlet of each of the coolers, Temperature detection signals detected by the temperature sensors are respectively inputted, and a temperature difference calculating means for calculating a temperature difference between an inlet and an outlet of each cooler, and the cooler based on the temperature difference obtained by the temperature difference calculating means. Determining means for determining whether or not there is a defect; comparing means for receiving a temperature detection signal detected by each of the temperature detection sensors and comparing the detected temperature value with a specified value; Display means for displaying the result of the comparison inputted from the comparing means, while displaying the result of the comparison by the comparing means, Governor control means for providing an input throttle signal to the governor of the prime mover that drives the turbine generator when it is determined that the value is equal to or more than the prescribed value.

[0011]

In the cooling device for a turbine generator having such a configuration, the temperature at the inlet and the outlet of each cooler is detected by a temperature sensor, and the temperature difference is obtained by a temperature difference calculating means. It is determined whether or not the cooler has a defect based on the temperature difference, and if there is no defect, a normal condition is displayed. The operating state of the cooler can be monitored, and the defective cooler can be easily identified.

The comparing means compares the detected temperature value detected by each temperature detecting sensor with a specified value, and displays a judgment signal inputted from the judging means and a comparison result inputted from the comparing means on a display means. At the same time, when it is determined by the comparison means that the detected temperature value is equal to or greater than the specified value, an input throttle signal is given to the governor control means to the governor of the prime mover that drives the turbine generator, and the output of the turbine generator becomes within the specified value. As a result, the temperature of each part in the machine can be reduced to a specified value or less, and the temperature can be made uniform.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show an example of the configuration of a cooling device for a turbine generator according to the present invention, wherein FIG. 1A is a cross-sectional view of the upper portion of the turbine generator, and FIG. FIG. 3 is a development view mainly showing a ventilation path of a cooling medium of air or hydrogen gas when developed. In FIG. 1, FIG.
The same components as those described above are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1, an air or hydrogen gas cooler 8 is arranged at each of the four corners of the stator frame 1, and a cooling medium of the air or hydrogen gas is formed by a fan 7 by each partition plate 4 and a ventilation pipe 5. Each part is circulated through the ventilation path.

A temperature sensor 9 is attached to each of the inlet (high temperature side) and outlet (low temperature side) of the air or hydrogen gas cooler 8 provided facing such a ventilation path, and the temperature detection signal is controlled by a control (not shown). It is input to the device to monitor the operating state of the air or hydrogen gas cooler 8 and monitor the temperature.

FIG. 2 shows an example of the configuration of a control device for processing a temperature detection signal input from a temperature sensor 9 attached to each section in the turbine generator. In FIG. 2, a temperature detection signal detected by a temperature sensor 9 of each section in the machine is input to a converter 101, where it is converted into a level required for signal processing and input to a temperature difference calculator 102. The temperature difference calculation unit 102 obtains the temperature difference between the inlet (high temperature side) and the outlet (low temperature side) of each cooler, and gives the calculation result to the first determination unit 103. This first determination unit 103
Then, it is determined whether or not the temperature difference between the inlet and outlet of each cooler is zero.If the temperature difference is zero, the corresponding cooler is determined to be defective.If not, it is determined that the cooler is normal. It is displayed on the display unit 104.

Further, the temperature detection signals at the inlet and outlet of each cooler from the converter 101 are input to the comparator 105. The comparison unit 105 compares the temperature of the cooler of each unit with a specified value. If the detected temperature value is smaller than the specified value, the comparison unit 105 determines that the temperature is normal, and if the detected temperature value is larger than the specified value, the governor control unit 106 In addition to the case where the cooler has a defect in the above-described determination unit 103, a determination signal is given to the governor of the prime mover that drives the turbine generator in order to provide an input throttle signal.

Next, the operation of the cooling device for a turbine generator provided with the control device having such a configuration will be described. Now
When the turbine generator is in operation, the air or hydrogen gas as a cooling medium in the machine is passed by the fan 7 through the ventilation path formed by the partition plates 4 and the ventilation pipes 5, and the stator core 2, the stator It flows to each part of the winding 3 and the rotor 6,
The cooling medium from which heat has been taken is cooled and circulated by air or hydrogen gas coolers 8 arranged at the four corners of the stator frame 1. At this time, each air or hydrogen gas cooler 8 is
Is taken into the control device shown in FIG.

In this control apparatus, first, a temperature detection signal detected by the temperature sensor 9 of each section is converted into a level required for signal processing by a converter 101, and a temperature difference calculation section 102
And the comparison unit 105 is entered. The temperature difference calculation unit 102 calculates the temperature difference between the inlet and the outlet of each cooler 8 and determines the result.
Give to 03. The determination unit 103 determines whether or not the temperature difference is zero. If the temperature difference is zero, the corresponding cooler is determined to be defective and the fact is displayed on the display 104. Also,
If the determination unit 103 determines that the temperature difference is not zero, it determines that the temperature difference is normal and displays the fact on the display unit 104.

On the other hand, when the temperature detection signals at the inlet and the outlet of each cooler 8 are input to the comparing section 105, these temperature detected values are compared with a specified value. Is normal and the display 104
To be displayed. When the detected temperature value is larger than the specified value, the determination unit 103 determines that the cooler has a defect, and in addition to the governor control unit 106, inputs an input throttle signal to the governor of the prime mover of the turbine generator. Is given in order to give As a result, the input of the prime mover is reduced, so that the temperature of each part of the turbine generator decreases.
In this case, in the case of a large heat capacity such as a turbine generator, the time constant is large, and even if the input reduction signal of the prime mover is sent to the governor 106 to reduce the output, the temperature of each part in the machine detected by the temperature sensor 9 changes. It takes time to do so. Therefore, the comparator 105 sends a determination signal to the governor control unit 106 so as to provide the input reduction signal of the prime mover to the governor control unit 106 until the detected temperature value of each part in the machine becomes equal to or less than the specified value.

As described above, in this embodiment, the temperature sensors 9 for detecting the inlet and outlet temperatures of the air or hydrogen gas cooler 8 are provided at each of the four corners of the stator frame 1 in the turbine generator. A temperature detection signal detected by the temperature sensor 9 is input to the control device, and a temperature difference calculation unit 102 obtains a temperature difference between the inlet and the outlet of each cooler 8, and a determination unit 103 determines that the temperature difference is zero. Is determined, and if it is determined to be zero, the corresponding cooler is determined to be defective and the display unit 104
Is displayed, the operating state of each cooler can be monitored, and it is possible to easily determine which cooler has become unusable. The temperature detection signal of each part in the machine detected by the temperature sensor 9 is compared with a specified value by a comparing unit 105. If the detected temperature value is equal to or larger than the specified value, the governor control unit 106 narrows down the input to the governor of the prime mover. Since a judgment signal is sent to give a signal, the input of the prime mover is narrowed and the output of the turbine generator is reduced, the temperature of each part in the machine can be kept below the specified value and even, and the operation can be performed as before It is possible to omit a complicated operation based on a member's judgment.

[0023]

As described above, according to the present invention, the temperature of each part is measured by a temperature sensor provided in each part in the machine,
When even one of a plurality of sets of coolers arranged in the stator frame becomes unusable, control can be performed so as to minimize the reduction in the output of the turbine generator. And a cooling device for the turbine generator, which can greatly reduce the temperature.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of a cooling device for a turbine generator according to the present invention.

FIG. 2 is a block circuit diagram of a control device in the embodiment.

FIG. 3 is a partially cutaway perspective view for explaining a schematic configuration of the entire turbine generator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator frame, 2 ... Stator iron core, 3 ... Stator winding, 4 ... Partition plate, 5 ... Ventilation tube, 6 ... Rotor, 7 ...
... Fan, 8 ... Cooler, 9 ... Temperature sensor, 101 ...
.. Converter 102, temperature difference calculation unit 105, comparison unit 106, governor.

Claims (2)

(57) [Claims] 1. A cooling medium such as air or hydrogen gas is circulated through ventilation passages formed in a stator frame, a stator, and a rotor in a machine by a fan attached to a rotating shaft, and is circulated in the stator frame. In a cooling device for a turbine generator comprising a plurality of sets of coolers for cooling the cooling medium facing the ventilation path, a temperature sensor provided at an inlet and an outlet of each of the coolers, Temperature detection signals detected by the temperature sensors are respectively inputted, and a temperature difference calculating means for calculating a temperature difference between an inlet and an outlet of each cooler, and the cooler based on the temperature difference obtained by the temperature difference calculating means. A cooling device for a turbine generator, comprising: determination means for determining whether or not there is a defect; and display means for receiving a determination signal from the determination means and displaying the presence or absence of a defect in each cooler. . 2. A cooling medium such as air or hydrogen gas is circulated through ventilation passages formed in a stator frame, a stator, and a rotor in the machine by a fan attached to a rotating shaft, and is circulated in the stator frame. In a cooling device for a turbine generator comprising a plurality of sets of coolers for cooling the cooling medium facing the ventilation path, a temperature sensor provided at an inlet and an outlet of each of the coolers, Temperature detection signals detected by the temperature sensors are respectively inputted, and a temperature difference calculating means for calculating a temperature difference between an inlet and an outlet of each cooler, and the cooler based on the temperature difference obtained by the temperature difference calculating means. Determining means for determining whether or not there is a defect; temperature detecting signals detected by the respective temperature detecting sensors are input, and comparing means for comparing the detected temperature value with a specified value;
A display means for displaying the presence or absence of a defect of each cooler according to the determination signal input from the determination means, and a comparison result input from the comparison means, and a temperature detection value by the comparison means of not less than a specified value. A governor control means for providing an input throttle signal to a governor of the prime mover which drives the turbine generator when it is determined that the turbine generator is present, a cooling device for the turbine generator.