JPH06276667A - Abnormality sensor for mist-cooled type electric apparatus - Google Patents

Abstract

PURPOSE:To sense an abnormality of an atomization from the outside of a tank regardless of the positions or number of atmizers provided in the tank, in a,mist-cooled type electric apparatus. CONSTITUTION:An atomizer 1 which atomizes a cooling medium 8 by the application of the ultrasonic vibration given from a piezoelectric element is provided. Further, a flow-rate monitoring part 14 which monitors the electric quantity fed to the piezoelectric element of the atomizer 1 comprises a flow-rate sensor 11 which transduces the flow rate of the cooling medium 8 fed to the atomizer 1 into an electric signal IIS and outputs it, a flow-rate deciding part 12 which outputs an informative signal 12S when the output level of the output signal 115 of the flow-rate sensor 11 deviates from a preset range, and a flow-rate- abnormality displaying part 13 which displays the abnormality of the flow rate of the cooling medium 8 by receiving the output signal 12S of the flow-rate deciding part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting an abnormality of an electric device cooled by a mist-like cooling medium by abnormal spray of a sprayer.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing the structure of a conventional abnormality detecting device for a mist cooling type electric device. A main body 2 of an electric device such as a transformer or a semiconductor converter, which is a heating element, is housed in a sealed tank 3, and an insulating gas 5 such as SF ₆ gas is sealed in the tank 3. A liquid reservoir 7 for storing a liquefied cooling medium 8 is arranged at the bottom of the tank 3. Further, a liquid delivery pipe 10 for guiding the cooling medium 8 accumulated in the liquid reservoir 7 to the sprayer 1 by a pump 9 provided midway is arranged outside the tank 3. The sprayer 1 is arranged in the internal space of the tank 3 and sprays a cooling medium 8 with a mist 2
Then, it is sprayed onto the electric device body 2. Further, on the left side surface of the tank 3, a condenser 4 that communicates with the internal space of the tank 3 is arranged.

In FIG. 6, the electric device body 6 is a sprayer 1.
It is cooled by the cooling medium 8 sprayed from. That is, when the cooling medium 8 approaches or comes into contact with the heat generating portion of the electric device body 6, the cooling medium 8 in that part is heated and evaporates, thereby depriving the electric device body 6 of evaporation latent heat. The evaporated cooling medium 8 becomes a flow 8A by natural convection together with the insulating gas 5 and moves to the condenser 4. The cooling medium 8 is liquefied by the condenser 4, and becomes a flow 8B by gravity, and enters the liquid reservoir 7. The cooling medium 8 in the liquid reservoir 7 is sent to the sprayer 1 again via the liquid sending pipe 10 by the pump 9.
Such a cooling system is called a mist cooling system, and the atomizing of the liquid cooling medium 8 allows the cooling medium 8 to penetrate into the fine gaps in the electric device body 6.
Since the insulating gas 5 has a poor cooling characteristic, it is cooled by a liquid cooling medium 8. There is also a method in which the entire electric device body 6 is immersed in a liquid cooling medium 8 to cool it, but this method requires a large amount of cooling medium 8 and is therefore limited to the case where the cooling medium 8 is inexpensive. A nonflammable liquid such as fluorocarbon (C ₈ F ₁₈ ) is used as the cooling medium 8 when it is desired to make the electric device body 6 nonflammable. However, since the fluorocarbon is very expensive, the mist cooling method is adopted.

As shown in FIG. 6, a sprayer 1 is used in a mist cooling type electric device, but since the sprayer 1 is covered with a tank 3, the sprayer 1 is damaged from the outside and the spray nozzle is clogged. In order to detect a spray abnormality of the cooling medium 8 or the like, a viewing window (not shown) is provided on the front side surface of the tank 3 so that the range of the alternate long and short dash line 28 can be visually observed. If the cooling medium 8 is not sprayed normally, the electric device body 6 will generate heat, leading to a serious accident. Therefore, it is very important to monitor the sprayed state of the cooling medium 8.

[0005]

However, while the conventional device as described above detects the spray abnormality of the sprayer by visual inspection through the viewing window, some devices include a plurality of sprayers. In that case, depending on the position of the sprayer, it may not be visible because it is behind the structure of the electric device. When trying to monitor the spray condition of all sprayers,
A large restriction is placed on the setting location of the sprayer, and effective cooling performance cannot be obtained.

An object of the present invention is to provide an abnormality detecting device for a mist cooling type electric device which can detect the abnormality of the spray from the outside of the tank regardless of the position or the number of the atomizer in the tank. It is in.

[0007]

To achieve the above object, according to the present invention, a tank accommodating a main body of an electric device together with an insulating gas, an atomizer for spraying a liquid cooling medium into the tank, and an electric machine A condenser that liquefies the cooling medium that is vaporized by the heat of the equipment body, a liquid reservoir that is placed at the bottom of the tank that stores the liquefied cooling medium, and a sprayer that is equipped with the cooling medium that has accumulated in this liquid reservoir on the way. A device for detecting an abnormality of an electric device composed of a liquid feed pipe for guiding to a sprayer by means of a spraying abnormality of a sprayer, and a flow rate monitoring unit for a cooling medium sent to the sprayer is provided in the middle of the liquid feed pipe for cooling. A flow rate sensor that converts the flow rate of the medium per unit time into an electric signal and outputs the flow rate sensor, and a flow rate determination unit that outputs a notification signal when the output signal level of the flow rate sensor is out of the set range, The flow rate of the received cooling medium an output signal to the flow determination unit is assumed to have been composed of a flow rate abnormality display unit for displaying an abnormal.

[0008] Further, a tank accommodating the electric equipment main body together with the insulating gas, a sprayer for spraying a liquid cooling medium into the tank, a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment main body, and a tank An abnormality of the electric device composed of a liquid reservoir arranged at the bottom for storing the liquefied cooling medium and a liquid delivery pipe for guiding the cooling medium accumulated in the liquid reservoir to the atomizer by a pump interposed in the middle of the atomizer A device for detecting an abnormality in spraying, which comprises a piezoelectric element for generating ultrasonic vibration by applying a high-frequency voltage to the sprayer from outside the tank through a power supply lead,
This is to atomize the cooling medium by applying ultrasonic vibrations from the piezoelectric element to the cooling medium, and an electricity amount monitoring unit for monitoring the amount of electricity sent to the piezoelectric element of the sprayer is provided in the middle of the power supply lead. Sensor that detects either the current flowing through the piezoelectric element, the voltage applied to the piezoelectric element, or the power consumed by the piezoelectric element, and a notification signal when the output signal level of this sensor is below the set level. It is assumed that it is configured by an electric quantity determination unit that outputs a signal and an electric abnormality display unit that receives an output signal of the electric quantity determination unit and displays that the voltage applied to the piezoelectric element is insufficient.

Further, a tank for accommodating the electric equipment main body together with an insulating gas, a sprayer for spraying a liquid cooling medium into the tank, a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment main body, and a tank An abnormality of the electric device composed of a liquid reservoir arranged at the bottom for storing the liquefied cooling medium and a liquid delivery pipe for guiding the cooling medium accumulated in the liquid reservoir to the atomizer by a pump interposed in the middle of the atomizer A device for detecting by abnormal spraying, wherein the sprayer is provided with a piezoelectric element that generates ultrasonic vibrations by applying a high-frequency voltage introduced from the outside of the tank through a power supply lead, and the ultrasonic vibrations from this piezoelectric element are used as a cooling medium. Is added to the atomizer to atomize the cooling medium, and a vibration amount monitor that monitors the magnitude of vibration caused by the piezoelectric element of the atomizer is attached to the atomizer. And an ultrasonic sensor that converts the magnitude of ultrasonic vibration into an electric signal and outputs the electric signal; a vibration amount determination unit that outputs a notification signal when the output signal level of the ultrasonic sensor is below a set level; A vibration amount abnormality display unit that indicates that the magnitude of vibration generated by the piezoelectric element is insufficient in response to an output signal to the amount determination unit.

In such a configuration, a flow rate monitoring unit for the cooling medium to be sent to the sprayer is provided in the middle of the liquid feeding pipe, and a flow rate sensor for converting the flow rate of the cooling medium per unit time into an electric signal and outputting the electric signal. A flow rate determination unit that outputs a notification signal when the output signal level of the flow rate sensor deviates from the set range, and a flow rate abnormality display unit that receives the output signal of this flow rate determination unit and displays that the flow rate of the cooling medium is abnormal. It is assumed to be configured by.

[0011]

According to the structure of the present invention, since the flow rate monitoring unit for the cooling medium sent to the sprayer is provided, the cooling medium of the set amount can be supplied from the sprayer regardless of the position of the sprayer in the tank. Is normally sprayed, and therefore abnormal spraying of the sprayer can be detected from the outside of the tank, and it can be determined that the electrical equipment is abnormal.

Further, when the atomizer has a piezoelectric element built therein and the cooling medium is atomized by ultrasonic vibration of the piezoelectric element, an electricity amount monitoring device for monitoring the electricity amount sent to the piezoelectric element from the power supply lead. However, or because the vibration amount monitoring unit that monitors the magnitude of vibration caused by the piezoelectric element of the sprayer is provided, the value set in the piezoelectric element of the value set in the piezoelectric element is displayed regardless of the position of the sprayer in the tank. A high-frequency voltage is applied, and the vibration of the magnitude necessary for atomizing the cooling medium is occurring. Also, the vibration of the magnitude set for atomizing the cooling medium is actually occurring. This can be detected from outside the tank. In such a configuration, in addition to the vibration amount detection of the piezoelectric element, the flow rate monitor of the cooling medium sent to the sprayer is provided,
The number of sensing items is increased, and the spray state of the sprayer can be reliably detected from outside the tank.

[0013]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a cross-sectional view showing the structure of an abnormality detecting device for a mist cooling type electric device according to an embodiment of the present invention, in which a flow rate monitoring unit 14 is provided instead of a viewing window. The flow rate monitoring unit 14 includes a flow rate sensor 11, a flow rate determination unit 12, and a flow rate abnormality display unit 13, and other configurations are the same as those of the conventional device shown in FIG. The same parts are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, the flow rate sensor 11 is a liquid delivery pipe 1
The flow rate of the cooling medium 8 per unit time, which is inserted in the middle of 0 and is sent to the sprayer 1, is converted into an electric signal 11S proportional to its size and output. The flow rate determination unit 12 receives the output signal 11S of the flow rate sensor 11 and outputs a notification signal 12S when the level of the signal 11S is out of the set range. The flow rate abnormality display unit 13 receives the output signal 12S from the flow rate determination unit 12 and displays that the flow rate of the cooling medium 8 is abnormal. A commercially available liquid sensor is used as the flow rate sensor 11, and the flow rate abnormality display unit 13 indicates that the apparatus is abnormal by, for example, an alarm buzzer, an alarm lamp, or a display screen. If the sprayer 1 itself is damaged or clogged, or if the liquid feed pipe 10 leaks inside the tank 3, the load of the liquid feed pump 9 changes, so the flow rate in the liquid feed pipe 10 changes. The flow rate of the cooling medium 8 must be constant at all times for normal spraying. Constantly monitoring the output signal 11S of the flow rate sensor 11 is very effective in detecting the spray abnormality of the sprayer 1.

FIG. 2 is a sectional view showing the construction of an abnormality detecting device for a mist cooling type electric device according to another embodiment of the present invention, in which an electric quantity monitoring section 20 is provided. Atomizer 2
1 is of a type that atomizes the cooling medium 8 by receiving a high frequency voltage generated by an oscillator 15 provided outside the tank 3 through a feed lead 16 that passes through a through terminal 22 and is drawn into the tank 2. Is. Also,
The electricity amount monitoring unit 20 includes an electricity amount detection sensor 17, an electricity amount determination unit 18, and a flow rate abnormality display unit 19, and the other configurations are the same as those in FIG. 1.

FIG. 3 is a sectional view showing the detailed structure of the sprayer 21 of FIG. In FIG. 3, the flow 8 of the cooling medium is centered on the axis.
A vibrating nozzle 36 passing through a hole 36A through which C is passed is supported by the housing 32 via cushions 35A and 35B. A disk-shaped piezoelectric element 38 is arranged in contact with the flange portion 36B of the vibration nozzle 36. The piezoelectric element 38 is sandwiched by electrodes 39A and 39B. further,
The electrode 39B holds a cylindrical balancer 45, and a lead wire 31 and a ground wire 37 are connected to the electrodes 39A and 39B, respectively. Lead wire 31 is through terminal 3
2 to the oscillator 15 shown in FIG. 2, and the ground wire 37 is connected to the ground terminal 34 fastened to the housing 32.

In FIG. 3, when a high frequency voltage is applied to the piezoelectric element 38, the piezoelectric element 38 causes ultrasonic vibration in the axial direction, and the vibrating nozzle 36 starts vibrating. Along with that,
Since the flow 8C of the cooling medium in the vibrating nozzle 36 is vibrated, the cooling medium is ejected as the mist 2 from the outlet tip of the vibrating nozzle 36 (left side in FIG. 3). The balancer 45 is a weight for giving stable ultrasonic vibration to the vibration nozzle 36. The atomizer shown in FIG. 3 is a so-called ultrasonic nozzle, which is generally commercially available, and can generate a mist 2 having a fine particle diameter. The particle size can be adjusted by the frequency of the high frequency voltage, and the higher the frequency, the smaller the particle size of the fog 2. For example, when the applied voltage has a frequency of 50 kHz to 100 kHz,
It is possible to generate the fog 2 having a particle size of 50 μm to 20 μm. The mist 2 having such a small particle diameter can continue to float inside the tank, and the cooling medium can reach the entire surface of the electric device body including the complicated place inside.

Returning to FIG. 2, the electric quantity detection sensor 17 is a current transformer, and detects a high frequency current flowing from the oscillator 15 to the piezoelectric element via the power supply lead 16 and sends the signal 17S to the electric quantity judging section 18. . The electric quantity determination unit 18 receives the signal 17S.
In response to this, the notification signal 18S is output when the level is equal to or lower than the set level. The electric quantity abnormality display section 19 displays the signal 18S.
In response to this, it is displayed that the piezoelectric element of the atomizer 21 does not vibrate in a magnitude necessary for atomization. In order to perform normal spraying, the magnitude of vibration generated by the piezoelectric element must be constant. Output signal 17S of the electric quantity detection sensor 17
Is constantly effective in detecting the spray abnormality of the sprayer 21.

Although the electric quantity detection sensor 17 in FIG. 2 is a current sensor, it may be a voltage sensor for detecting a high frequency voltage applied to the piezoelectric element or a high frequency power sensor consumed by the piezoelectric element. Both are generally commercially available. That is, if the amount of electricity such as current, voltage, or power is equal to or less than the preset value, the piezoelectric element does not vibrate in a normal magnitude.

FIG. 4 is a sectional view showing the structure of an abnormality detecting device for a mist cooling type electric device according to a further different embodiment of the present invention, in which a vibration amount monitoring section 27 is provided. The vibration amount monitoring unit 27 includes an ultrasonic sensor 24, a vibration amount determination unit 25, and a vibration amount abnormality display unit 26, and the other configurations are the same as those in FIG. The ultrasonic sensor 24 is attached in contact with the housing 32 (FIG. 3) of the sprayer 21, converts the magnitude of ultrasonic vibration propagating from the built-in piezoelectric element into an electric signal 24S, and passes through the penetrating terminal 23. Output to the outside of the tank 3 through the detection line 29. The vibration amount determination unit 25 receives the signal 24S and outputs the notification signal 25S when the level of the signal 24S is equal to or lower than the set level. Further, the vibration amount abnormality display unit 26 receives the signal 25S and displays that the magnitude of vibration of the sprayer 21 is insufficient.

The ultrasonic sensor 24 is a so-called ultrasonic microphone, which also has a built-in piezoelectric element. This piezoelectric element is essentially the same as the piezoelectric element 38 of FIG. 3, but is configured to output an electric signal by receiving mechanical vibration, and utilizes the reverse property of the piezoelectric element 38. It is a thing. Although the supporting portion of the sprayer 21 is not shown in FIG.
And it is supported by the liquid feed pipe 10 through a cushion (not shown). In order for normal spraying to be performed, the magnitude of vibration generated by the piezoelectric element contained in the sprayer 21 must be constant. Output signal 24 of ultrasonic sensor 24
The constant monitoring of S is very effective in detecting the spray abnormality of the sprayer 21.

FIG. 5 is a sectional view showing the structure of an abnormality detecting device for mist cooling type electric equipment according to a further different embodiment of the present invention. With respect to the sprayer 21, the flow rate monitoring unit 14,
An electric quantity monitoring unit 20 and a vibration quantity monitoring unit 27 are provided, and the other configuration is the same as that of FIG. Atomizer 2
1, the flow rate of the cooling medium 8 sent to the sprayer 1, the high frequency voltage sent to the sprayer 21 via the power supply lead 16, and the sprayer 21.
All of the vibrations that it causes are monitored at the same time. By increasing the number of sensing items, the atomizer 21
The abnormality can be reliably notified from the outside of the tank 3. For example, in the case of only monitoring the flow rate of the cooling medium 8, a type that does not vibrate ultrasonically like the atomizer 1 in FIG. 1 can detect the abnormality, but the atomizer 21 in FIG. Even if it comes in, it will never become fog 2 unless it is ultrasonically vibrated. Tank 3 as described above
Since the inside cannot be seen at all, it is effective that there are as many kinds of monitoring units of the sprayer 21 as possible.

In each of the embodiments shown in FIGS. 1 to 5, a single sprayer is provided, but when a plurality of sprayers are provided, a monitoring unit is provided for each and the abnormality is monitored. You can The monitoring unit according to the present invention can constantly monitor the spray state regardless of the position of the sprayer in the tank.

[0024]

As described above, the present invention provides a flow rate monitor,
By providing the electricity amount monitoring unit or the vibration amount monitoring unit, it is possible to detect the spray abnormality from the outside of the tank regardless of where the sprayer is installed. Moreover, since any of the monitoring units is provided with an abnormality display unit, it is possible to constantly monitor, and it is possible to immediately detect when the fog surrounding the electric device body is insufficient and avoid a serious accident. .

The above-mentioned monitoring unit can be installed even if the number of sprayers installed increases, and the number of kinds of monitoring units is also increased so that the flow rate of the cooling medium and the magnitude of vibration of the sprayers are simultaneously monitored. The reliability of abnormality detection can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an abnormality detection device for a mist cooling type electric device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of an abnormality detection device for a mist cooling type electric device according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a detailed structure of the sprayer shown in FIG.

FIG. 4 is a sectional view showing a configuration of an abnormality detection device for a mist cooling type electric device according to a further different embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a configuration of an abnormality detection device for a mist cooling type electric device according to still another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a configuration of a conventional abnormality detection device for a mist cooling type electric device.

[Explanation of symbols]

1,21: atomizer, 2: fog, 3: tank, 4: condenser,
5: Insulating gas, 6: Electric device main body, 7: Liquid reservoir, 8: Cooling medium, 9: Liquid feed pump, 10: Liquid feed pipe, 11: Flow rate sensor, 12: Flow rate determination unit, 13: Flow rate abnormality display unit 1
4: Flow rate monitor, 15: Transmitter, 16: Power supply lead, 1
7: Electric quantity detection sensor, 18: Electric quantity judgment section, 19: Electric quantity abnormality display section, 20: Electric quantity monitoring section, 22, 23, 3
3: Penetration terminal, 24: Ultrasonic sensor, 25: Vibration amount determination unit, 26: Vibration amount abnormality display unit, 27: Vibration amount monitoring unit, 2
9: Detection line, 38: Piezoelectric element, 39A, 39B: Electrode

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Watanabe 1-4-1, Mei Station, Nakamura-ku, Aichi Prefecture Nagoya City Tokai Passenger Railway Co., Ltd. (72) Inventor Yoshitake Nakagami Tanabe, Kawasaki City, Kawasaki City, Kanagawa Prefecture Nitta No. 1 in Fuji Electric Co., Ltd. (72) Inventor Toshihide Watanabe Tanabe, Kawasaki-ku, Kanagawa Prefecture Tanabe No. 1 Fuji Electric Co., Ltd. (72) Yukio Okamoto Tanabe, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 Nitta Fuji Electric Co., Ltd.

Claims (4)

[Claims] 1. A tank containing an electric equipment body together with an insulating gas, a sprayer for spraying a liquid cooling medium into the tank, a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment body, and a tank. An abnormality of the electric device composed of a liquid reservoir arranged at the bottom for storing the liquefied cooling medium and a liquid delivery pipe for guiding the cooling medium accumulated in the liquid reservoir to the atomizer by a pump interposed in the middle of the atomizer A device for detecting abnormalities in spraying, in which a flow rate monitoring unit for the cooling medium sent to the sprayer is provided in the middle of the liquid delivery pipe and converts the flow rate of the cooling medium per unit time into an electric signal for output. And a flow rate determination unit that outputs a notification signal when the output signal level of this flow rate sensor is out of the set range, and that the flow rate of the cooling medium is abnormal when receiving the output signal to this flow rate determination unit. Abnormality detection device of mist-cooled electrical equipment, characterized in that it is constituted by a flow rate abnormality display unit for displaying. 2. A tank containing an electric equipment body together with an insulating gas, a sprayer for spraying a liquid cooling medium into the tank, a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment body, and a tank. An abnormality of the electric device composed of a liquid reservoir arranged at the bottom for storing the liquefied cooling medium and a liquid delivery pipe for guiding the cooling medium accumulated in the liquid reservoir to the atomizer by a pump interposed in the middle of the atomizer A device for detecting abnormality in spraying, wherein the sprayer is provided with a piezoelectric element that generates ultrasonic vibrations by applying a high-frequency voltage introduced from the outside of the tank through a power supply lead, and the ultrasonic vibrations from the piezoelectric element are used as a cooling medium. In order to atomize the cooling medium, the electricity quantity monitoring unit that monitors the electricity quantity sent to the piezoelectric element of the atomizer is installed in the middle of the power supply lead. An electric quantity detection sensor that detects either the current flowing through the piezoelectric element, the voltage applied to the piezoelectric element, or the electric power consumed by the piezoelectric element, and a notification signal when the output signal level of this electric quantity detection sensor is below a set level. A mist comprising an electric quantity determination section for outputting and an electric quantity abnormality display section for displaying that the voltage applied to the piezoelectric element is insufficient when receiving the output signal of the electric quantity determination section. Abnormality detection device for cooling electric equipment. 3. A tank containing an electric device body together with an insulating gas, a sprayer for spraying a liquid cooling medium into the tank, a condenser for liquefying the cooling medium vaporized by the heat of the electric device body, and a tank. An abnormality of the electric device composed of a liquid reservoir arranged at the bottom for storing the liquefied cooling medium and a liquid delivery pipe for guiding the cooling medium accumulated in the liquid reservoir to the atomizer by a pump interposed in the middle of the atomizer A device for detecting by abnormal spraying, wherein the sprayer is provided with a piezoelectric element that generates ultrasonic vibrations by applying a high-frequency voltage introduced from the outside of the tank through a power supply lead, and the ultrasonic vibrations from this piezoelectric element are used as a cooling medium. Is added to the atomizer to atomize the cooling medium, and a vibration amount monitor that monitors the magnitude of vibration caused by the piezoelectric element of the atomizer is attached to the atomizer. An ultrasonic sensor that converts the magnitude of sonic vibration into an electric signal and outputs the electric signal, a vibration amount determination unit that outputs a notification signal when the output signal level of the ultrasonic sensor is below a set level, and the vibration amount determination unit And a vibration amount abnormality display section that indicates that the magnitude of vibration caused by the piezoelectric element is insufficient. 4. The method according to claim 2 or 3, wherein a flow rate monitoring unit for the cooling medium sent to the sprayer is provided in the middle of the liquid feeding pipe to convert the flow rate of the cooling medium per unit time into an electric signal. The flow rate sensor that outputs a notification signal when the output signal level of this flow rate sensor is out of the set range, and the flow rate of the cooling medium is abnormal when the output signal of this flow rate determination section is received. An abnormality detection device for a mist cooling type electric device, comprising: