JPH06204048A - Abnormality monitor for stationary induction apparatus - Google Patents

Abstract

PURPOSE:In a stationary induction apparatus of a complex cooling system, to detect even a trace of leakage of a coolant into a tank from an insulated container for containing an electric appliance body. CONSTITUTION:In a stationary induction apparatus such as a transformer comprising a tank 1 in which an insulating gas is sealed, an insulated container 2 placed in the tank 1, and an electric appliance body consisting of a winding 3 and a core 4 which are dipped in the coolant in the insulated container 2, there are provided a sensor for detecting the vapor component of the coolant in the bottom of the tank 1, a diagnostic means 8, and an alarm output device 9. In the diagnostic means 8, the detected output of the sensor 7 is compared with a preset reference value, and if the reference voltage is exceeded, it is determined that there is a leakage of the coolant, and the alarm is given by the alarm output device 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides the inside of a tank into a refrigerant liquid portion and an insulating gas portion by a container provided therein, and immerses an electric appliance body in the refrigerant liquid filled in the container. More particularly, the present invention relates to an abnormality monitoring device for detecting leakage of a refrigerant liquid from a container accommodating an electric body into a tank.

[0002]

[Prior Art] Mainly from the viewpoint of disaster prevention in densely populated urban areas, it is increasingly required to make high-voltage and large-capacity transformers non-combustible and highly reliable, and conventional insulating oil has been replaced with non-combustible media Transformers have been proposed. As a non-combustible medium, S
An insulating gas such as F ₆ gas and an insulating liquid such as fluorocarbon are used. However, since a cooling capacity is low and it is difficult to increase the capacity with only SF ₆ gas, a transformer using both of them,
For example, there has been proposed a gas-insulated transformer of an evaporation cooling type in which a winding wire or only a winding wire and an iron core is immersed in the non-combustible liquid which is a refrigerant.

Japanese Laid-Open Patent Publication No. 6-58242 discloses a device for monitoring leakage of nonflammable liquid in a transformer for the purpose of making it nonflammable.
Japanese Patent Laid-Open No. 2-266811 discloses a liquid level monitoring device for a liquid-cooled gas-insulated induction electric appliance. This device floats a float in a cylindrical part through which an insulating liquid flows, and an optical signal transmitted through a color filter provided in the float changes by the movement of the float, that is, the movement of the liquid surface. It is to detect a decrease.

[0004]

In the above-mentioned transformer, when it is operated for a long period of time, deterioration of members due to vibration from the outside or vibration during operation, electrical, thermal,
Also, deterioration over time due to mechanical stress occurs. Due to these reasons, there is a possibility that a problem may occur in the closed system of the insulating container and the insulating refrigerant liquid may leak into the tank containing the insulating gas. When detecting the leakage of the refrigerant liquid by lowering the liquid level as in the prior art,
If there is no large amount of leakage, it is difficult to detect it. If there is a large amount of leakage, not only will cooling be insufficient, but S
Due to the dissolution of the F ₆ gas or the dissolution of the gas in the refrigerant liquid in the container, the gas pressure is lowered, or bubbles are generated in the winding, and the dielectric strength is lowered.

Therefore, an object of the present invention is to provide an abnormality monitoring device for a static induction electric device which can detect even a small amount of refrigerant liquid leakage to the outside of the container with high accuracy.

[0006]

To achieve the above object, the present invention provides a sensor for detecting a refrigerant liquid vapor component contained in an insulating gas in a tank, a detection output of the sensor and a preset reference. A diagnostic unit that determines whether or not the refrigerant liquid has leaked by comparing the values with each other is provided, or a sensor that detects the density of the gas in the tank at different positions in the tank, and each of these sensors. A sensor that detects the difference in the detection output of the sensor and provides a diagnostic unit that determines that the refrigerant liquid has leaked when this difference exceeds a preset value, or a sensor that further detects the purity of the insulating gas in the tank The sensor output is compared with the value indicating the purity of the insulating gas under normal conditions, and when the detected output falls below the value indicating the purity under normal conditions by a preset value or more, the refrigerant liquid leaks. There is provided a diagnostic unit determines that Atsuta, when it is determined that the leakage of refrigerant liquid has been made in the above diagnostic unit, for example, alert, characterized in that so as to notify it.

[0007]

When the refrigerant liquid leaks from the container or the like, the leaked refrigerant liquid is evaporated in accordance with the vapor pressure and the temperature or pressure in the tank while being stored in the tank filled with the insulating gas. The vapor component will be mixed in the insulating gas. Therefore, as in the present invention described above, by providing a sensor that detects the vapor component contained in the insulating gas in the tank and a diagnostic unit that compares the reference value with the detection output of this sensor, the refrigerant liquid Can be determined. Also, when the vapor component of the refrigerant liquid is mixed in the insulating gas, the density of the gas changes at different positions in the tank, so a sensor that detects the density of the gas at different positions in the tank is used. , By determining the difference between the detection output of each of these sensors, and by providing a diagnosis unit that determines that the refrigerant liquid has leaked when this difference exceeds a preset value, whether or not the refrigerant liquid has leaked. Can be determined. Furthermore, when the vapor component of the refrigerant liquid is mixed in the insulating gas, the purity of the insulating gas changes,
A sensor that detects the purity of the insulating gas in the tank was compared with the detection output of this sensor and a value that indicates the purity of the insulating gas in normal times, and the detection output was set in advance above the value that indicates the purity of normal times. It is possible to determine whether or not the refrigerant liquid has leaked by providing a diagnostic unit that determines that the refrigerant liquid has leaked when the value drops by a value or more. Then, when it is determined that the leakage of the refrigerant liquid has occurred in each of the diagnosis units, the notification device can notify this, for example, by issuing an alarm.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a schematic vertical sectional view showing an embodiment in which the present invention is applied to a composite insulation type transformer. In FIG. 1, reference numeral 1 is a tank in which an insulating gas is enclosed, and an insulating container 2 filled with a refrigerant liquid is stored in the tank 1. Inside the insulating container 2, a winding 3 and an iron core are provided. The transformer body consisting of 4 is installed in a state of being immersed in the coolant liquid. A cooler 5 and a pump 6 are installed outside the tank 1 so that the refrigerant liquid in the insulating container 2 is circulated and cooled to cool the transformer body. A sensor 7 for detecting the vapor component of the refrigerant liquid, for example, a hot-wire type semiconductor gas sensor having a strong selectivity for the vapor component of the refrigerant liquid, is provided in the lower portion of the tank 1, and its detection output is provided by the diagnostic unit 8 outside the tank 1. It is connected to the alarm output device 9.

When the refrigerant liquid leaks from the insulating container 2 into the tank 1, at least a part of the leaked refrigerant liquid evaporates and diffuses. If the specific gravity is heavier than the specific gravity of the insulating gas, the tank 1 It accumulates in the lower part of the inside. Therefore,
The vapor component of the refrigerant liquid is detected by the sensor 7 provided in the lower portion of the tank 1, and the detection output is input to the diagnosis unit 8 for determination. The diagnosis unit 8 includes a storage unit and a comparison determination unit. The comparison determination unit compares the reference value set in advance and stored in the storage unit with the detection output, and when the detection output exceeds the reference value, the refrigerant liquid It is judged that there was a leakage of. This determination result is input to the alarm output device 9 and an alarm is output.

According to this embodiment, the leakage of the refrigerant liquid from the insulating container 2 into the insulating gas filled tank 1 can be detected with high accuracy from a very small amount. Further, the sensor is provided not only at one place in the lower part of the tank but at a plurality of places, or at least one place is provided at a plurality of different positions other than the lower part of the tank, so that the refrigerant can be more reliably and highly accurately provided. Leakage of liquid can be detected.

When a gas chromatograph detector is used as the sensor 7, the tank is provided with a gas extraction port, and the detector column is connected to the gas extraction port.
The column may be replaced every time sensing is performed, the presence or absence of the vaporized component of the refrigerant liquid may be detected from the detected gas components, and the detection output may be transmitted to the diagnostic unit.

Further, as the sensor, a sensor for detecting the purity of the insulating gas may be used instead of the sensor for detecting the vapor component of the refrigerant liquid. When the vapor component of the refrigerant liquid is mixed in the insulating gas, the purity of the insulating gas changes, so the sensor detects the purity of the insulating gas. Compare with the value that indicates the purity of the insulating gas when the vapor component of the refrigerant liquid is not mixed in the gas, and the leakage of the refrigerant liquid occurs when the detection output falls below the normal value by a preset value or more. You can judge that it is hot.

FIG. 2 is a schematic vertical sectional view showing another embodiment in which the present invention is applied to a composite insulation type transformer. This Figure 2
1, the same reference numerals as those in the embodiment of FIG. 1 indicate the same or corresponding parts. In this embodiment, at least 2 in the tank 1
Sensors 7A and 7B that detect the density of at least one gas are provided at different heights in each place, and the detection outputs of both sensors 7A and 7B are connected to a diagnostic unit 8 and an alarm output device 9 outside the tank 1. Has been done. The diagnosis unit 8 is the comparison unit 10.
And a storage unit 11.

Now, when the refrigerant liquid leaks from the insulating container 2 into the tank 1, at least a part of the leaked refrigerant liquid evaporates and diffuses to be mixed in the insulating gas. When the evaporation component of the refrigerant liquid is mixed in the insulating gas as described above, the density of the gas changes at the positions of different heights in the tank 1 due to the difference in specific gravity between the two sensors.
The gas density values in the upper part and the lower part in the tank 1 detected by 7B are compared in the comparison part 10 to obtain the difference, and when the difference exceeds the value preset in the storage part 11, the diagnosis part 8 It is determined that the refrigerant liquid has leaked. Then, this determination result is input to the alarm output device 9 and an alarm is output.

Also in the case of this embodiment, the leakage of the refrigerant liquid can be detected with high accuracy even from a very small amount.

In each of the above embodiments, the alarm device is used as the alarm device, but the present invention is not limited to this, and a display device or the like may be used.

[0018]

As described above, according to the present invention,
When the refrigerant liquid leaks into the tank from its container or the like, the leaked refrigerant liquid evaporates, paying attention to the evaporation component being mixed in the insulating gas, a sensor for detecting the vapor component of the refrigerant liquid in the tank, A sensor that detects the density of each gas at different heights in the tank or a sensor that detects the purity of the insulating gas in the tank is provided, and the leakage of the refrigerant liquid in the diagnostic unit is based on the output of these sensors. Since it is determined whether or not the leakage has occurred, it is possible to highly accurately detect the leakage of the refrigerant liquid from a minute amount.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing a composite cooling type transformer according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view showing a combined cooling type transformer according to another embodiment of the present invention.

[Explanation of symbols]

 1 Tank 2 Insulation Container 3 Winding 4 Iron Core 7, 7A, 7B Sensor 8 Diagnostic Section 9 Alarm Output Device

Claims (4)

[Claims] 1. A tank having an insulating gas sealed therein, a container provided in the tank and filled with a refrigerant liquid, and an electric appliance body housed in the container and immersed in the refrigerant liquid. In the static induction electric device, a sensor for detecting the refrigerant liquid vapor component contained in the insulating gas in the tank, and the detection output of this sensor and a preset reference value are compared to determine whether the refrigerant liquid has leaked. An abnormality monitoring device for a static induction machine, comprising: a diagnosis unit for determining whether or not there is leakage, and a device for notifying the leakage when it is determined that the leakage has occurred. 2. The detection unit according to claim 1, wherein the diagnosis unit compares a storage unit that stores the reference value with a reference value stored in the storage unit and a detection output of the sensor. And a comparison determination unit that determines that the leakage has occurred when exceeds the reference value. 3. A tank having an insulating gas sealed therein, a container provided in the tank and filled with a refrigerant liquid, and an electric main body housed in the container and immersed in the refrigerant liquid. In the static induction device, at least one sensor is provided at each position in the tank having a different height to detect the density of the gas in the tank, and a sensor provided at a higher position and a sensor output provided at a lower position. The difference between the detected output of the sensor obtained, when the difference exceeds a preset value, the diagnosis unit that determines that there is leakage of the refrigerant liquid, and when this diagnosis unit determines that the leakage has occurred, this An apparatus for monitoring an abnormality of a stationary induction machine, comprising: 4. A tank having an insulating gas sealed therein, a container provided in the tank and filled with a refrigerant liquid, and an electric appliance body housed in the container and immersed in the refrigerant liquid. In the static induction machine, a sensor for detecting the purity of the insulating gas in the tank is compared with the detection output of this sensor and a value indicating the purity of the insulating gas in the normal state, and the detection output is the value in the normal state. A diagnostic unit that determines that there has been a leakage of the refrigerant liquid when it has decreased by a preset value or more than that, and a device that notifies this when it has been determined that the leakage has occurred in this diagnostic unit, Anomalous monitoring device for static induction equipment.