JPS60204241A - Coolant supplying device of rotary electric machine - Google Patents

Abstract

PURPOSE:To perform energy-saving and to reduce an abrupt variation in the temperature in a rotary electric machine by providing a flow rate detector for measuring coolant flow rate in the course of a coolant supply system, and controlling the rotating speed of a coolant pump on the basis of the detected value. CONSTITUTION:A coolant circulating system from a water storage tank 4 through a coolant pump 5, a cooling mechanism having a cooler 7 and a filter 11 to a rotary electric machine 1 is formed. A flow rate detector 24 is mounted in a pipe 15 of the side to which the coolant is flowed to the machine 1, an inverter 27 is so controlled that the detected amount becomes equal to the flow rate set in advance by a control output setter 26, thereby controlling the rotating speed of a drive motor 6 of the coolant pump 5. A temperature detector 22 may be mounted in the pipe 15 to eliminate an abrupt cooling by heating by a heater 20 if the temperature of the coolant is excessively low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cooling water supply device for a rotating electric machine that circulates cooling water to cool a heating element of a 1!21 converter such as a turbine generator.

[Technical background of the invention and its problems]

For general 62 large-capacity rotating magnetic machines ≦ 2, the great storm flow (=
Due to the generated Joule heat, the temperature of the entire rotating electrical machine increases, causing various adverse effects. Therefore, various cooling devices have been devised to prevent the temperature of rotating electric machines from rising. For example, a cooling system for directly water-cooling or oil-cooling the stator windings of a turbine generator includes a water tank, a cooling water pump, a cooler as a water adjustment device, and a valve that automatically controls the amount of water used in the cooler. The head is the main groove part.

In general (= such equipment), the amount of cooling water supplied to the turbine generator is determined by adjusting the pressure of the supplied cooling water to a predetermined value (
Normally, the resistance of the supply and I pipes is adjusted to a constant value at 1.6 to 2.0 mm (9A'd-) (2 sides are set. The amount of cooling water should be adjusted based on the pressure so that the required amount of cooling water at the rated load of the c'-turbine generator can be obtained. The pump is operated at a constant speed, and the amount of cooling water circulating to the fixed winding remains constant regardless of increases or decreases in the operating load of the turbine generator (9), and the pump is operated at a constant capacity.

In addition, when the turbine generator is turning or stopped, for example, temporary stoppage inspection of the turbine generator on weekends, inspection of other generator-related equipment (2), or load I, ll maintenance maintenance plant, etc. Turbine generator load adjustment operation (periodic outage period (in both cases))
To maintain the purity of the cooling water system and to maintain the state in which the turbine generator can resume operation (2. To maintain the purity of the cooling water system and to maintain a state where it can be restarted (2. There is.

In this way, even when the 12 turbine generators are in all-load adjustment operation, no-load operation, or stopped (-), the cooling water circulation system is in 100% operating state, and the auxiliary power is always 100%. The above-mentioned cooling system also has disadvantages in terms of maintenance. In places where the outside air temperature is extremely low, such as in cold regions or highlands, the temperature of the cooling water drops, causing the inside of the turbine generator to cool down rapidly.

Furthermore, there was a problem in that condensation of the gas (hydrogen, air, etc.) inside the aircraft had a negative effect on the coil insulation and internal parts.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling water supply system for a rotating electrical machine that reduces energy waste and temperature changes.

[Summary of the invention]

The cooling water supply device for a rotating electrical machine according to the present invention is provided with a flow rate detection transmitter that measures the flow rate of the cooling water midway through the cooling water supply system, and rotates the drive motor of the cooling water pump in response to the detected flow rate. It is characterized by being configured to control the speed.

[Embodiments of the invention]

The present invention will be explained below with reference to each of the embodiments shown in the drawings. 2
A hollow conductor is used to form the cooling water pipe 3. A cooling water supply system for this cooling water pipe line 3 includes a water storage tank 4, a cooling water pump 5, a cooler 7, and a filter 11.
8. A temperature control valve for adjusting the amount of cooling water used in this system. A shutoff valve 18 and a shutoff valve 19 are provided. In addition, an ion exchange tower 17 is provided to convert the cooling water into highly purified water.

When the pump 5 is operated in this cooling water supply system (-), the cooling water in the water storage tank 4 is
Cooled at temperature? The A regulating valve 8 mixes it with the high-temperature cooling water that does not go through the cooler 2-7 to a predetermined temperature (Ninal).It then passes through the filter 11 to the supply pipe 15 to generate turbine power generation a1≦
Two are introduced. The cooling water, which has increased in temperature due to the heat of the stator winding 2, passes through the RF pipe 16 and returns to the water storage 114.

On the other hand, part of the cooling water that has exited the filter 11 is transferred to the stator winding 2.
The water is not supplied to the ion exchanger 17, but is returned to the water storage 4114 as highly purified water.

In this way, the cooling water cools the stator winding 2 by continuous circulation. The temperature of the cooling water is detected at step 10, a temperature detection signal corresponding to this temperature is generated, and the temperature adjustment valve 8 is controlled by this signal C2 (secondly, the temperature of the cooling water is adjusted).

However, in the present invention (2), a discharge amount control mechanism 50 is provided which controls the discharge amount of the cooling water pump 5 (=downstream of the shutoff valve 18 provided in the middle of the supply pipe 15. That is, the supply pipe In the middle of step 15 (2), a flow rate detection device array is provided that detects the amount of supplied cooling water and outputs a detection signal, this detection signal is converted into a control signal by a detection signal converter 5, and this control signal is input. The inverter device
The rotational speed of the drive motor 6 of the cooling water pump 5 is increased or decreased by changing the frequency of the cooling water pump 5. The control output setting device inputs a control signal corresponding to the detected flow rate (2) in the supply pipe 15, and sets the signal value corresponding to the stator winding 2 (-2 of the cooling water amount to be supplied) of the turbine generator 1 in advance. is set, and the deviation between this set value and the input value is canceled to obtain the set value (2), and a control output signal is generated by performing two control calculations.

In addition, in the present invention (2), a heating device is provided in the middle of the supply pipe 15 (= the upstream and downstream of the Arai 19). It has a bypass pipe 21 and a heater 20 around this pipe 21.
The temperature of the cooling water at the inlet of the cooling water pipe 3 of the stator winding 2 is detected by a temperature detector n, and this detection signal is inputted to a switch for switching control.

Next (The cooling water supply operation of the cooling water supply device according to the present invention (2) will be explained in detail. During normal operation of the turbine generator 1 (
= is the required amount of cooling water at the rated load of the turbine generator 1 (
2) Set the corresponding signal value in the control output setting device (
Second, the electric motor 6 and pump 5 are maintained at their rated operating conditions, and the cooling water supply device operates in the same manner as before. At this time, the new well is in an open state, and cooling water is flowing through the supply pipe line 15 and the heating bypass pipe line 21.

When turning generator 2 is turning or stopped,
Closing the cooling well 19 (=Yoshi, Ri, - Fixed pre-winding of the bin power generation i1 // The amount of cooling water supplied to the cooling water pipe 342 of it 2 is all sent to the bypass circuit 21 and heated by the heating device. The temperature of the cooling water decreases and the turbine generator 1 is cooled in a harmonious manner so that the inside of the turbine generator 1 is not cooled down rapidly.On the other hand, some of the cooling water is heated as in normal operation. After leaving the 4-nifilter 11, the water passes through the ion exchange tower 17, becomes highly pure water, and is directly returned to the water storage 44.

Therefore, the purity of the cooling water in the storage water system is maintained within a predetermined range, and the purity of the cooling water in the cooling water system is also maintained within a predetermined range. range (2 maintained).

Next (2. Decrease in outside air temperature) When the temperature of the circulating cooling water decreases (=, the temperature detection signal from the temperature detector n is sent to the switching device n, and the heating device can be turned on and cooled. Increase the temperature of the water. Therefore, even if there is a large change in the outside air temperature (2), the temperature of the cooling water supplied to the turbine generator 1 (= constant (-) or higher than the predetermined value C2 with respect to the dew point temperature of the cabin gas It can be supplied in circulation while being maintained.

During no-load operation of the turbine generator 1 (2), the required discharge amount of the pump 5 is determined by the minimum flow rate required for ion exchange to maintain the purity of the cooling water, the required flow rate for heating the heating device (2), and the minimum flow rate required for ion exchange (2). During the rated operation of the turbine generator 1, the discharge flow rate of the pump 5 is extremely small (2%), and its value is generally (2% or less) sufficient. The set value is changed so that the amount of supplied cooling water is reduced to a predetermined value (==reduced), and the rotational speed of the drive motor 6 of the pump 5 is controlled to reduce the pump discharge amount and the pump is operated.

General (= Such a cooling water supply device (- The pump 5 used is a centrifugal pump.
increases or decreases in proportion to the square of the number per pump cycle. An example of such a pump characteristic curve is shown in Figure 2. and LIO indicate the P-Q characteristics and pump shaft power characteristics at the pump's rated rotation, and the dotted lines P-Q2 and L9 indicate the P-Q characteristics and pump shaft power characteristics when the pump rotation speed is decreased. .

The curve 0-A shows a flow resistance curve for the cooling water amount fluctuation C2 in the cooling water circulation circuit of the turbine power generation +Bx.

Here, the discharge pressure of the pump 5 is always operated in equilibrium with the flowing water resistance of the cooling water circulation circuit. Therefore, during rated operation, the P-Q1 curve shown by the solid line and the flowing water resistance curve of the pipe line two - When operating at the values of the discharge flow iQo and the discharge pressure P at the intersection point P0 of A, the rotational speed of the electric pump MA6 for driving the pump is decreased (the second case is p indicated by the dotted line).
The pump is operated by reducing the pump operating capacity to the value of the discharge flow rate Q1 and the discharge pressure P1 at the intersection P1 of the -Q2 curve and the water flow resistance curve 0-A. Further, the shaft power of the pump 5 decreases in proportion to the cube of the rotational speed C2, from LO to Ll. Therefore, the operating energy is saved by Lo−Ll (
Two.

In another embodiment shown in Figure 3, a humidity detector unit is provided to detect the internal humidity of the turbine generator 1, and the detection signal of the humidity detector unit and the cooling water supply pipe described above are The cooling water temperature detection signal of the temperature sensor n in the controller 29 (
= input, and the controller 29 compares and calculates the humidity detection signal and the temperature detection signal (=Yes, the turbine generator 10
Calculate the control signal that controls the capacity of the heating device and send this control signal to the switching device (2) so that the cooling water supply temperature can be maintained higher than the cabin humidity above a predetermined value (2). The cooling water temperature supplied to the turbine generator 1 is adjusted by controlling the capacity of the heating device.

Further, another embodiment shown in FIG. 4(2) is a turbine generator 1(
In cases where there is no possibility of a problem in which the cooling water temperature for the two turbines decreases, the heating device can be omitted, and the turbine generator
This is an energy-saving system that operates by adjusting the amount of cooling water according to the load (2).

Furthermore, other embodiments shown in FIGS.
= A pressure detection signal that measures the pressure of the supplied cooling water, and this pressure detection signal is used to control the rotational speed of the pump drive electric motor A6 via the pressure converter (equipment), control setting unit, and inverter unit Hn, and It is configured to control the pressure of cooling water supplied to the generator 1 at a predetermined value.

〔Effect of the invention〕

As described above (according to the second aspect of the present invention), a flow rate detection and transmitting device for measuring the flow rate of the cooling water (-) is provided in the middle of the cooling water supply system of the rotating electrical machine, and this detected flow rate (=corresponding to the drive motor of the cooling water pump) By controlling the rotational speed of the machine, it is possible to control the discharge amount of the pump corresponding to the load of the rotating electric machine (2), which prevents the occurrence of thermal stress due to sudden temperature changes inside the machine. 2. The pump can be operated effectively ≦ 2 energy-saving (2).

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of a cooling water supply device for a rotating electric machine according to the present invention, Fig. 2 is a characteristic diagram showing the characteristics of a cooling water pump used in the present invention (= Fig. 3). 4 and 5 are system diagrams showing other different embodiments of the present invention. l... Rotating electric machine 2... Stator winding 3... Cooling water pipe line 4... Water tank 5... Cooling water pump 6... Pump drive motor 7.
...Cooler 8...Temperature control valve 9...Temperature control valve 1o...Positioner 11...Filter 15
．． 16...Cooling water pipe 17...Ion exchange tower 19
...Sharai rib...Heating device Ru...Switching device n...Temperature detector For...Flow rate detector δ...Detection signal converter Le...Output setting device 27 ...Inverter A...Humidity detector 29...Pressure detector Cabinet...
・Discharge rate control mechanism (8733) Agent: Yoshiaki Inomata, patent attorney

Claims (2)

[Claims] (1) Heat generating part (rotating electric machine that uses water cooling for one pair =
The system is equipped with a water storage tank, a cooling water pump, a cooler for adjusting the cooling water temperature, and a cooling water supply system whose main component is a valve head that automatically controls the amount of cooling water used. In the middle of the supply system, a flow rate detector is installed to measure the amount of cooling water in the system, and furthermore, the flow rate in the system is set to a predetermined value (=(2) corresponding to the detected flow rate of this flow rate detector). 1. A cooling water supply device for a rotating electrical machine, characterized in that it is provided with a discharge amount control mechanism that controls the discharge amount of a cooling water pump. (2) A pressure detector is installed in the middle of the cooling water supply system (2) to measure the cooling water pressure in the system, and the detection pressure of this pressure detector is correspondingly increased. A cooling water supply device for a rotating electric machine according to claim 1, characterized in that a discharge amount control mechanism is provided for controlling the discharge amount of the cooling water pump to a predetermined value (2). A heating device is installed to guide the cooling water depending on the bypass pipe area in the middle (= required port), and the heating capacity of the heating device is adjusted so that the temperature of the cooling water becomes a predetermined value (= 2 cooling water temperatures). A cooling water supply device for a rotating electric machine according to claim 1, characterized in that a heater control mechanism is provided for controlling the rotating electric machine.4. cooling water supply for a rotating electrical machine according to claim 3, characterized in that the heater control mechanism is configured to control the heater control mechanism so that the temperature of the cooling water becomes a predetermined value; Device.