JPS60102714A - Evaporative cooling type gas insulating electrical apparatus - Google Patents

Abstract

PURPOSE:To optimize the state in which a cooler is left as it is cooled at all times by detecting a boundary surface of refrigerant vapor in cooling ducts and a noncondensable gas and controlling a gas pump so that the boundary surface coincides with a reference boundary surface separately set. CONSTITUTION:A detector 21 with a sensor detecting boundary surfaces 13 is fitted to a cooler 3. A signal from the sensor is inputted to a controller 22 controlling the operation and stoppage of a gas pump 16, and the drive of the gas pump 16 is controlled by the controller 22. Accordingly, the boundary surfaces 13 can be positioned so that the electric apparatus 1 can be cooled properly at all times.

Description

[Detailed description of the invention] [Technical field of invention] The present invention reduces evaporative cooling type gas insulated electrical equipment to 1%.

This invention relates to the control of the interface between non-condensable gas and refrigerant vapor in the cooler.

[Prior art]

Conventionally, in electrical equipment that generates internal heat during operation, as an efficient means to dissipate the internal heat, non-condensable gases with different specific gravities and refrigerants with phase changes have been used, and the non-condensable gas in the cooler has been used. I tried to eject it. There is a so-called evaporative cooling type gas insulation system.
As shown in the figure.

In the figure, an electrical device that generates heat is housed in a tanker, and the cooler 3 and the tanker communicate with each other via upper and lower headers tIa and +b. In addition, the tank is filled with a certain ratio of non-condensable gas 9 (hereinafter referred to as gas) and a refrigerant that undergoes a gas-liquid phase change when heat is transferred, and the liquid phase refrigerant on the left accumulates at the bottom of the tank. This liquid is discharged into the tank tank through piping 7 by a liquid pump B, and sprayed onto electric equipment L that generates heat. electrical equipment l
A part of the liquid phase refrigerant S sprayed on the electrical equipment absorbs heat from the electrical equipment and at the same time vaporizes to become refrigerant vapor g. and gas are selected, the refrigerant vapor sinks downward and stagnates, and also enters the cooling duct 10 through the lower communication pipes 2 and 2 and the lower header b. Therefore,
In this cooling section, heat is radiated by, for example, an air blower, and at the same time as the heat is radiated, the refrigerant vapor g is liquefied, and heat is radiated according to the heat radiating capacity of the cooler using the refrigerant as a heat transporter. Also, the gas 9 entering the cooler 3 is
Upper communication pipe that communicates the above header +a with the tanker/
The gas is discharged to the tank by the check valve l on the left and the gas pump l.

In this way, when the electrical equipment 1 is generating heat due to the load, and when the liquid phase refrigerant S is sprayed into the tank tank through the piping by the liquid pump B and poured into the electrical equipment 1,
A part of the liquid phase refrigerant is vaporized and becomes refrigerant vapor g. Therefore,
Since the non-condensable gas 9 sealed in the tanker and cooler 3 has a lower specific gravity than the refrigerant vapor, the refrigerant vapor g sinks downward and the gas 9 accumulates upward due to this difference in specific gravity. In this way, an interface 13 between the refrigerant vapor t and the gas is generated,
The height of the boundary surface 13 moves upward as the load increases.

When the gas pump IA is operated, the gas in the upper part of the cooler 3 is transferred into the tanker through the upper communication pipe /+ provided with the check valve ih, and the refrigerant vapor flows into the cooling duct l instead.

It comes up to the top. In this state, the refrigerant vapor g fills the cooling duct IO, so that the refrigerant vapor g is condensed over the entire area of the cooling duct 10, and the cooler 3 can perform efficient heat exchange.

However, in such a conventional device, when one gas pump 1A is operated in series, the amount of liquid phase refrigerant released is small when the load of the electrical equipment 1 is light.
This has the disadvantage that it sucks up all of the refrigerant vapor g stagnant below, and even sucks up the gas inside the tank, which actually reduces the heat dissipation ability. Furthermore, even if the gas pump 16 is operated at regular intervals, it has the disadvantage that it is extremely difficult to find the appropriate interval for intermittent operation if the load on the electrical equipment is subject to large fluctuations. ing.

[Summary of the invention]

The present invention has been made for the purpose of eliminating the drawbacks of the above-mentioned conventional devices and providing an evaporative cooling type gas insulated electrical device that always maintains the cooling condition of the cooler in an appropriate state under any load conditions. For this purpose, there is a detection device for detecting the interface between refrigerant vapor and non-condensable gas existing in the cooling duct, and a gas pump so that the interface coincides with a separately set reference interface. By providing a control device for controlling the operation of the evaporative cooling type gas insulated electric device, the cooler is always kept in an optimal state.

[Embodiments of the invention]

The present invention will be explained below based on FIG. 2 showing one embodiment thereof.

In the figure, the cooler 3 is equipped with a detection device 2/ that has a sensor that detects the boundary surface 13, and a signal from this sensor is input to the control device 22 that controls the operation and stop of the gas pump/B. death.

These two control devices control the drive of the gas pump/A, and position the boundary surface so that the boundary m13 can be properly cooled at all times.

The details of the example of the detection device 2/ of the boundary surface 13 shown in FIG. 2 are as shown in FIG.
is a plurality of sensors, for example, five sensors, for example, thermocouples 3/a, provided at regular intervals in the cooling duct IO.
31b, 3/C, 3/(1°,?t 6 and lead wires 3.2 described below, and these thermocouples 3/a to 3/
The thermoelectromotive force e is inputted to the control device Yuco through the lead wire 3a. Also, numeral 33 is a hermetic seal.

Now, the height of the boundary surface in the cooling duct)/3.

Then, the temperature distribution from position A to position E where thermocouples 3/& to 3/e are provided is as shown in FIG. 4, for example. That is, at the height h/, which is a portion filled with steam, the temperature is almost constant and high, and in a portion where there is gas above the boundary surface 13, the temperature suddenly decreases.

Therefore, thermocouples 3/a to 3/e from position A to position E
Looking at the electromotive force of the thermocouples at positions A, B, and C, ?
/ a , 3 / b , 3 / C has a large 1 position, and thermocouples 3 / ld and 3 / e at E suddenly become smaller, causing a temperature drop T. From this, from this, the position C It is possible to detect that there is an interface /3 between and the position.

Therefore, since the boundary surface 13 can be detected in this way,
The height of the reference boundary surface set by the control device according to the load conditions of the electrical equipment l, for example, up to the height of the above boundary surface /,? needs to be raised, but in this case,
The gas pump 16 may be operated to exhaust the gas above into the tank so that a drop T in electromotive force is generated between the positions E and E.

In the above embodiment, a thermocouple placed in the cooling duct IO was used as the sensor of the detection device, but the thermocouple is not limited to this, and the measurement may be performed on the outer wall of the cooling duct IO. , the measurement may be performed using a sensor other than a thermocouple.

〔Effect of the invention〕

The present invention detects the interface between the non-condensable gas and the refrigerant vapor in the cooling duct using the detection device as described above, and also sets a reference interface that is set separately, and detects the interface between the non-condensable gas and the refrigerant vapor in the cooling duct by using this and the detection device. A control device is provided to operate the gas pump to compare the above boundary surface and match the two, so the above boundary surface can be placed at the optimal position for the load conditions of the electrical equipment. This has the effect of providing an evaporative cooling type gas insulating device that can be moved and, therefore, can always keep the cooler in an appropriate cooling state under any load conditions.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a conventional evaporative cooling type gas feed line electric device, FIG. 2 is a schematic sectional view of an embodiment of the device of the present invention, and FIG.
The figure is a detailed sectional view of the main part of FIG. 2, and FIG. 4 is an explanatory diagram of the correspondence between the apparatus shown in FIG. 2 and its refrigerant vapor height-temperature diagram. l...electrical equipment, co...tank, 3...cooler, Qa...
-Top header, gb...Bottom header,!・・Liquid phase refrigerant 1g・・Refrigerant vapor, 9・・Noncondensable gas (gas), 1
θ...Cooling duct, 13...Boundary surface, /...Upper communication pipe, ls...Check valve. 16... Gas pump, ko/... Detection device 5.2 ko... Control device, 3/a~31e... Sensor (thermocouple), 3λ
· · Lead. In each figure, the same reference numerals indicate the same or corresponding parts. Agent So Ga Dosho Proceedings Amendment ``Voluntary'' 1982.飄、η0 ``Dear Commissioner of the Japan Patent Office 1, Indication of the case Showa! 1st year patent application No. 44 2, Name of the invention Evaporative cooling type gas insulated electrical device 3, Name of the person making the amendment (601) Mitsubishi Electric Co., Ltd. Representative: Hitoshi Katayama, Department 4, Agent address: 4th floor, 5th floor, Marunouchi Building, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo; Parrot subject to correction: ＼ aa*o″′A-toge 1姥” lρji,・・′・−＼!,,,
5g,, ,o) ・,4.7nte;72-7ノ■ (1) Award 6, Contents of amendment [The specification is amended as follows.

Claims (1)

[Claims] (1) Consisting of electrical equipment, a tank that houses the electrical equipment, and a cooler that radiates heat generated from the electrical equipment to the outside, the tank contains a non-condensable gas and its vapor specific gravity is the non-condensable gas. The cooler is filled with a refrigerant that is larger than a gas and undergoes a gas-liquid phase change. A ladder is provided to the upper and lower parts communicating through the lower communicating pipe 2
A check valve that vents non-condensable gas only from the ladder to the top and into the tank is provided in the middle of the upper communication pipe, and a gas pump that discharges the non-condensable gas from the ladder to the top and into the tank. In the evaporative cooling type gas insulated electrical equipment, there is a detection device that detects the interface between the refrigerant vapor and the non-condensable gas existing in the cooling duct, and a detection device that detects the interface between the refrigerant vapor and the non-condensable gas that exists in the cooling duct, and a detection device that detects the interface between the refrigerant vapor and the non-condensable gas that exists in the cooling duct, and An evaporative cooling type gas insulated electrical device characterized by being provided with a control device for controlling the operation of a gas pump. -) The evaporative cooling type gas insulated electrical device according to claim 7, wherein the set reference boundary surface is set in accordance with the load condition of the electrical device. (,71 Claim 1 in which the boundary surface detection device measures either the temperature inside the cooling duct or the temperature of the outer wall of the cooling duct, and the position of the boundary surface is characterized by this temperature.
The evaporative cooling type gas insulated electrical device according to item 1 or 2.