JPH0523131U - Oil-in-gas monitoring device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the gas from leaking into the oil chamber of the oil-gas separation device and improve the measurement accuracy of the gas concentration. [Structure] In a structure in which a permeable membrane is sandwiched between flanges of an oil chamber and a gas chamber of an oil-gas separation device to fix the permeable membrane, the flange is located outside the packing and is sandwiched between the flanges. A seal member for preventing gas leakage is provided so that it can be stolen. Leakage of gas in the gas chamber is prevented by the packing and the sealing material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an in-oil gas monitoring device used for constantly monitoring the deterioration state of oil used in oil-filled electrical equipment such as oil-filled transformers.

[0002]

[Prior Art]

 In order to know the state of deterioration of oil such as insulating oil, the amount of gas (for example, hydrogen gas) in the oil is measured. In order to perform the measurement continuously, an oil-gas separation device using a permeable membrane made of a polymer membrane may be used.

FIG. 3 shows a conventional device, in which a pipe 3 having a valve 2 is connected to a side wall of an oil-filled electrical device to be measured, for example, an oil-filled transformer 1, and an oil-gas separation is provided at a tip of the pipe 3. Attach the device 4. The oil-gas separation device 4 is mainly configured by an oil chamber 5, a gas chamber 7 separated from the oil chamber 5 by a permeable membrane 6, and a gas sensor 8 in the gas chamber 7.

The permeable membrane 6 is inserted and fixed between the packings 11 and 12 sandwiched by the flanges 9 and 10 of the chambers 5 and 7, respectively. 13 is a bolt for tightening both flanges 9 and 10, and 14 is its nut.

When an abnormal state such as discharge or overheat occurs in the oil-filled transformer 1, hydrogen gas or other combustible gas or carbon dioxide gas is generated. When these gases reach the oil chamber 5 by diffusion in oil, they are extracted from there into the gas chamber 7 through the permeable membrane 6. Then, according to Henry's law, extraction is performed until the gas concentration in the oil and the gas concentration in the gas chamber 7 are in equilibrium, and the equilibrium value is measured via the gas sensor 8.

By the way, as the permeable membrane 6 used here, a membrane made of a polymer such as polyimide or fluororesin is generally used, but this kind of membrane is in close contact with the packings 11 and 12 made of rubber or the like. However, the gas in the gas chamber 7 may leak from between the packing and the permeable membrane 6. When such a leakage phenomenon occurs, it is unavoidable that the detection accuracy of the gas concentration decreases.

[0007]

[Problems to be solved by the device]

 The present invention aims to prevent leakage of gas in the gas chamber and improve the accuracy of gas concentration measurement.

[0008]

[Means for Solving the Problems]

 According to the present invention, in a configuration in which the permeable membrane is fixed by sandwiching the packing between the flanges of the oil chamber and the gas chamber of the oil-gas separation device, the flanges are located outside the packing, and It is characterized by having a seal member to prevent gas leakage so that it can be caught.

[0009]

[Action]

 By providing a seal member for preventing gas leakage so as to be sandwiched between the flanges of the oil chamber and the gas chamber, leakage of gas in the gas chamber can be prevented. Rubber, O-rings, etc. are used as the seal member, but these seal members have good adhesion to the metals that make up the flange, so gas leakage from between the seal member and the flange is reliable. You will be able to avoid it.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIG. In addition, the parts given the same reference numerals as those in FIG. 3 indicate the same or corresponding parts. According to the present invention, a seal member 15 for preventing gas leakage is provided outside the packings 11 and 12 so as to be sandwiched by the flanges 9 and 10.

According to the above configuration, not only the packing 12 prevents the gas extracted into the gas chamber 7 from leaking, but also the seal member 15 prevents the gas from leaking. Since the sealing member 15 has good adhesion with the flanges 9 and 10, the prevention of leakage thereof can be maintained for a long period of time.

Next, an experimental example of the present invention will be described. A polyimide membrane (thickness: 50 μm) was used as the permeable membrane 6, the effective permeation area was 189 cm 2, and the permeation measurement was measured when the hydrogen gas concentration in the oil was 500 ppm. FIG. 2 shows changes in the gas concentration in the gas chamber 7 with respect to the elapsed days. The concentration of this gas was measured using a heat conduction type hydrogen gas sensor.

In the figure, a curve A is a characteristic diagram according to the present invention, and a curve B is a characteristic diagram according to the configuration shown in FIG. As can be understood from this, when the conventional configuration is used, the gas concentration in the gas chamber is low, and the leakage of hydrogen gas is noticeable. On the contrary, according to the present invention, it is found that the equilibrium value according to Henry's law is obtained.

[0014]

[Effect of the device]

 As described in detail above, according to the present invention, it is possible to reliably prevent the gas leakage in the gas chamber as seen in the conventional configuration, and thus it is possible to accurately measure the gas concentration in oil. Produce an effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a characteristic diagram for explaining the effect of the present invention and showing changes in hydrogen gas concentration with respect to elapsed days.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Electrical Equipment with Oil 4 Oil-Gas Separator 5 Oil Chamber 6 Permeable Membrane 7 Gas Chamber 8 Gas Sensor 9 Flange 10 Flange 11 Packing 12 Packing 15 Sealing Material

Claims (1)

[Scope of utility model registration request] 1. An oil-gas separation apparatus comprising: an oil chamber; a gas chamber separated from the oil chamber by a polymer membrane; and a gas sensor for detecting gas in the gas chamber. In the gas monitoring device, in a configuration in which the permeable membrane is sandwiched between the flanges of the oil chamber and the gas chamber of the oil-gas separation device and fixed by sandwiching the permeable membrane, at both locations outside the packing, An in-oil gas monitoring device provided with a seal member for preventing gas leakage so as to be caught by a flange.