KR100817223B1 - High sensitivity on line equipment for detecting dissolved gases in oil with multilateral membrane - Google Patents

Abstract

A high-sensitivity on-line dissolved gas detector using polyhedral membrane is provided to measure dissolved gas generated from defects of inflow-type electric devices. A high-sensitivity on-line dissolved gas detector using polyhedral membrane comprises as follows. An insulation oil collector(10) collecting insulation oil from inflow-type electric devices on line. A polyhedral membrane(20) passes only dissolved gas from the insulation oil. A gas station unit(40) measures the dissolved gas flowing through the polyhedral membrane and discharges residual gas using an electro-chemical gas sensor(30). A gas density determination unit(50) determines gas density from output of the electro-chemical gas sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high sensitivity on-line gas detection apparatus using polyhedral membranes,

1 is a block diagram of a highly efficient on-line gas detection apparatus using a polyhedral membrane.

Figure 2 shows the output characteristics of the polyhedral and cross-sectional membranes.

3 is a structural view of a polyhedral membrane.

4A is a detailed structural view of a unit membrane.

FIG. 4B is a cross-sectional view showing the structure in which the ring-shaped polymer film is inserted in FIG.

5 is a diagram showing the relationship between the measurement time and the gas sensor output;

6 is a view showing the relationship between the gas sensor maximum value and the gas concentration obtained from Fig.

DESCRIPTION OF REFERENCE NUMERALS

10: Insulating oil collecting part 20: Polyhedral membrane

25: Membrane frame 27: Unit membrane

30: Electrochemical gas sensor 40: Gas chamber

42: Gas chamber 45: Gas chamber heater

50: gas concentration determining section 61, 62, 63, 64, 65: solenoid valve

71,72: Pump 80: Insulating oil cell

90: heater and temperature control device 92: flat membrane polymer membrane

94: stainless mesh screen 96: upper guide ring

98: lower guide ring 100: valve

120: air hole 130: control and computing device

140: Communication device 150: Display device

160: Ring-type polymer film for adhesion strengthening

  Hydraulic power equipment such as inflow type transformers, reactors, and OF cables are subjected to thermal, electrical, mechanical and environmental stresses during operation, causing internal abnormalities such as local overheating, partial discharge, and arc discharge. If this is done, the breakdown will proceed and finally the insulation breakdown will occur. To prevent this, many diagnostic methods have been used to detect and repair faults before an inflow power device has reached a large fault such as insulation breakdown, but among them, gas analysis is the most reliable and generally used.

  In the conventional cross-sectional membrane membrane, the membrane area is increased to increase the sensitivity to increase the gas permeation rate in the oil. However, this has limited the increase of the area due to the mechanical damage due to the hydraulic pressure. In addition, The use of metal sintered body was applied to the membrane, but the use of the metal sintered body had a disadvantage that the cost was increased due to the difficulty of workability and the possibility of leaking through the edge of the membrane and the sintered body existed.

   In order to overcome the above-described problems, the present invention provides a method of extracting insulating oil on-line in accordance with a predetermined sequence and extracting the oil gas generated when the inflow-type power device fails from the extracted insulating oil by using a polyhedral membrane membrane reinforced by mechanical force And an apparatus for measuring the amount of gas in the gas using an electric chemical gas sensor. Since this device is an on-line measuring device, efficient gas detection is possible, and mechanically reinforced membrane of polyhedral shape is constructed, which not only takes into account the mechanical safety of the membrane against hydraulic pressure, Gas was extracted to improve the measurement sensitivity of the apparatus. In addition, since membrane and electrochemical gas sensor, which are core parts, are realized at a low unit price, the present invention is intended to use high sensitivity, low cost, and efficient gas detection.

    A highly sensitive on-line gas detection apparatus using a polyhedral membrane is an apparatus for measuring on-line gas generated from a failure of an inflow power device.

First, an apparatus configuration of a highly sensitive on-line dissolved gas detecting apparatus according to the present invention will be described. In the highly sensitive on-line dissolved gas detecting apparatus, an insulating oil collecting unit for collecting insulating oil from an inflow- A polygonal membrane through which only a gas in the gas is passed from the insulating oil taken from the gas sensor, and a gas stream introduced through the polyhedral membrane is measured using an electrochemical gas sensor, and a gas chamber for discharging the residual gas to the atmosphere, And a gas concentration determination section for determining the gas concentration from the output of the sensor.

The insulating oil collecting part includes a solenoid valve for drawing out the insulating oil from the inflow-type electric power machine and circulating and stopping the insulating oil in a predetermined order, an insulating oil cell for storing the circulating insulating oil for extracting the dissolved gas in the insulating oil for a predetermined time, It consists of a heater and a temperature control device to keep the temperature of the insulating oil in the inside constant.

The polyhedral membrane permeates only the gas in the insulating oil, and is installed in the insulating oil stored in the insulating oil cell. It is preferable that the polyhedral membrane has two or more unit membranes.

Further, the unit membrane includes a flat membrane polymer membrane for blocking the flow of the insulating oil and passing only the oil gas, a stainless mesh screen adhered to the opposite side of the flat membrane polymer membrane in contact with the insulating oil so as to withstand the hydraulic pressure, And a ring-shaped polymer film for adhesive strengthening provided on the upper and lower portions of the flat membrane polymer membrane, respectively, in order to improve the adhesion performance of the upper guide ring and the lower guide ring and the flat membrane polymer membrane, .

 Preferably, the stainless mesh screen has a plate having a predetermined width at a rim portion contacting the flat polymeric membrane or the ring-type polymer film for adhesion enhancement.

 The gas chamber is formed with a gas chamber having a gas chamber heater therein. The solenoid valve is formed above and to the left of the gas chamber. A pump is extended under the solenoid valve. A porous And a membrane is provided. The porous membrane is preferably installed in the air hole.

   The gas concentration determination unit is composed of a control and arithmetic unit, a communication unit, and a display unit. Further, the gas concentration determination unit determines the maximum value from the output of the electrochemical gas sensor measured for a predetermined time, and determines the gas concentration based on the relationship between the concentration of the gas in the gas and the maximum value.

Hereinafter, the working relationship with the above-described configuration of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a high-efficiency on-line gas detection apparatus using a polyhedral membrane. An on-line gas detection apparatus includes an insulating oil collecting unit 10 for collecting insulating oil from an inflow-type power equipment on-line, a polyhedral membrane 20 (membrane, metal membrane gas chamber) through which only oil gas is passed from the collected insulating oil, A gas concentration unit 50 (a control and arithmetic unit 130) for determining the concentration of gas in the gas from the output of the gas sensor 30 measured for a predetermined time, a gas chamber 40 for detecting a gas in the gas flowing through the membrane, , A display device 150), other temperature control device, a system internal heater 90, a communication device 140, and the like.
The electroosmotic sensor 30 is installed between the upper and lower solenoid valves 64 and 65 in the gas chamber 40 and the heater 45 is attached to the lower portion of the gas chamber 40 to measure the temperature of the gas chamber 40 at a constant temperature .
The gas applied through the polyhedral membrane 20 flows into the gas chamber 40 through the solenoid valve 63 and the tube connected to the solenoid valve 64 is exposed to the outside air, Release.
That is, when the remaining gas in the gas chamber 42 is removed, the pump 72 is driven and the solenoid valves 64 and 65 are opened, the residual gas is discharged to the outside atmosphere, and the solenoid valve 64 is opened, , 65 and then ready to measure the gas stream applied through the solenoid 63. [
2 is a diagram showing output characteristics of a polyhedron and a cross-sectional membrane. The gas in the insulating oil permeates the membrane. Since the amount of permeated oil gas is proportional to the area of the membrane, a larger amount of permeation is required when the membrane is permeated through two or more faces than when a membrane having the same area is permeated, so that when the gas concentration in the insulating oil is the same, The higher the output of the inverter. That is, when the concentration is C, the gas sensor output of the gas permeating through the cross-sectional membrane is B and when the gas sensor output of the gas permeating through the polyhedral membrane is A, the sensitivity becomes A> B, .

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3 is an example of the structure of the polyhedral membrane 20. As shown in the figure, the cross-sectional membrane of the same area is assembled several times in a certain mold to form a polyhedron. The right side of Fig. 3 is an example of a pentagon, and the left side is an example of a dodecahedron. The mold frame to which the membrane is attached is made of a metal material and assembled with the membrane by using O-rings and bolts. The inside of the mold is filled with the gas permeated through the membrane, and the gas chamber 42, .

4A is a detailed structural view of the unit membrane 27, and FIG. 4B is a view showing a structure in which the ring-shaped polymer film 160 for adhesion enhancement is inserted in FIG. 4A, which is a detailed structural view of the unit membrane 27, .

 As shown in the figure, the unit membrane 27 is composed of a metal upper guide ring 96 and a lower guide ring 98, a polymer film membrane 92 in the form of a circular film, and a stainless steel net screen 94 for printing. A portion of the valve membrane 100 of the stainless mesh screen 94 and the portion of the valve membrane 100 of the stainless mesh screen 94 and the portion of the valve membrane 100 of the stainless mesh screen 94 are disposed between the upper guide ring 96 and the polymer membrane membrane 92, The guide rings 98 are adhered to each other using an adhesive member, and the entire structure is compressed by bolts. The surface of the stainless steel net screen for printing 94 is provided with a plate film 100 on both sides thereof using a photosensitive material or the like as much as the area covered by the guide rings 96 and 98.

4B is a cross-sectional view illustrating a state in which a ring-shaped polymer film 160 having a good adhesive property is inserted into upper and lower portions of a flat membrane polymer membrane 92 to improve the adhesive strength of the flat membrane polymer membrane 92 by using an adhesive member. Membrane.

5 is a diagram showing the relationship between the measurement time and the gas sensor output. As shown in the figure, the output of the gas sensor shows a characteristic of decreasing after a peak at a similar time for various concentrations as the measurement time elapses, and the peak value shows a proportional relationship with the concentration of gas in the gas.

Fig. 6 is a graph showing the relationship between the gas sensor maximum value and the gas concentration obtained from Fig. 5. Fig. The figure shows the relationship between the maximum value of the gas sensor and the gas concentration, and the concentration of the gas in the gas can be known by measuring the output of the gas sensor.

In other words, the output of the gas sensor due to the measurement of the gas sensor is rapidly increased at the initial stage, then decreased after showing the maximum value, and the concentration of gas in the gas is determined by the maximum value of the output.

More specifically, the structure and characteristics of the high-sensitivity gas detection apparatus according to the present invention will be described in detail. The apparatus has a membrane 20 having a suitable area, which is made up of a polyhedron to optimize the hydraulic pressure received by the membrane, It is possible to improve the measurement sensitivity to the same gas gas. In addition, by using the stainless mesh screen (94) used in screen printing for mechanical reinforcement of the membrane against the hydraulic pressure, it is possible to solve not only the cost but also the mechanical damage or the leakage problem, The economical efficiency of the apparatus is considered by using the electrochemical sensor 30. The initial measurement state of the gas sensor 30 is kept constant by exhausting the residual gas to the gas chamber 40 and the external air suction, and when the gas naturally diffused into the gas chamber 42 during the measurement reaches a predetermined time The gas concentration in the gas chamber 42 increases at the beginning of the measurement and decreases after the maximum value is shown by causing the porous membrane (not shown) to flow out of the gas chamber 42 through the air hole 120 provided therein. The above-mentioned algorithm of the new concept of detecting the change characteristic during the measurement by the electrochemical gas sensor 30 and finding the maximum output value from the gas sensor output characteristic according to the measurement time as described above (oil circulation, And the gas chamber 42 is closed by closing the passage between the membrane frame 25 and the gas chamber 42 so that the residual gas is discharged and the gas chamber 42 is again initialized by sucking the outside air).

Hereinafter, the operation of the high sensitivity gas sensing apparatus according to the present invention will be described.

Referring to FIG. 1, the insulating oil of the inflow-type electric power tool is automatically or manually extracted, and the gas is extracted from the polyhedral membrane membrane 92 of the polyhedral membrane 20 through the polyhedral membrane membrane 92. Before measuring the gas, the dielectric oil is allowed to pass through the insulating oil cell (80) while circulating the dielectric oil in the inflow-type electric power device in the standby state, so that the internal insulating oil becomes the same state as the insulating oil in the transformer.

That is, in order to measure the oil gas, which is an object of the present invention, on-line measurement, the insulating oil of the inlet type electric power machine is automatically or manually extracted, and the gas is extracted from the oil using the polyhedral membrane membrane 92. Therefore, the gas in the oil in the present insulating oil permeates the polyhedral membrane 20 by the natural diffusion method. Since the amount of the permeated gas is proportional to the area of the polyhedral membrane 20, when the polyhedral membrane 20 is permeated through two or more faces of the membrane having the same area, When the gas concentrations are equal, the output of the electrochemical gas sensor 30 becomes high. 2, when the concentration is C, the gas sensor output of the gas permeated through the cross-sectional membrane is B, and when the gas sensor output of the gas permeated through the polyhedral membrane 20 is A, And the sensitivity to the gas concentration in the gas is improved.

The gas permeated through the polyhedral membrane 20 is collected and diffused into the gas chamber 42 where the electrochemical gas sensor 30 is installed so that the electrochemical gas sensor 30 provided in the gas chamber 42 is introduced And the gas concentration is obtained by the output characteristic with respect to time.

At this time, the solenoid valves 63, 64, and 65 of the gas chamber 40 are closed during the circulation of the oil, but the circulation of the oil is stopped and the valve 63 is opened only to measure the gas concentration to react with the gas.

A porous membrane (not shown) formed in the gas chamber 42 is installed in the air hole 120 so that the gas flowing into the gas chamber 42 can be discharged to the outside during the measurement.

In this way, the measurement of the gas concentration is performed by opening the passage between the membrane frame (25) and the gas chamber (42) by measuring the oil circulation and the oil circulation stop, closing and discharging the residual gas, And then the gas chamber 42 is initialized. The measurement of the gas concentration is performed by circulating the insulating oil and stopping the circulation of the oil, opening the path between the membrane frame 25 and the gas chamber 42, starting the concentration measurement, stopping the concentration measurement, The passage between the gas chambers 42 is closed, the residual gas is exhausted and the outside air is introduced, and the gas chamber 42 is initialized. The gas concentration determination unit 50 in which the control and calculation unit 130, the communication unit 140, and the display unit 150 are built and installed can be automatically or manually controlled.

Since the specific operation relationship or configuration of the above control equipment is generally known, detailed description thereof will be omitted here.

After completion of the measurement, the inside of the gas chamber 42 is discharged by injecting residual gas inside the membrane frame 25 and residual gas inside the gas chamber 42, thereby initializing the outside air. Will be ready to measure and monitor the oil gas on-line again at the next meeting.

The detection device according to the present invention can improve the measurement sensitivity to the same gas by optimizing the hydraulic pressure received by the membrane and increasing the permeation amount of the gas in the gas by constituting the membrane having a proper area as a polyhedron, Mechanical stability of the membrane can be achieved. In addition, membrane and electrochemical gas sensors, which are key components, can be mass-produced to solve not only cost reduction but also mechanical damage and leakage. Therefore, the economical efficiency of the gas detection unit is considered by using the economical electrochemical gas sensor as compared with other gas sensing methods, and a new concept algorithm for determining the concentration of gas in the gas using the maximum value in the gas sensor output characteristic according to the measurement time It is possible to detect the gas in the gas on-line.

Claims (10)

A high sensitivity on-line gas detection apparatus, An insulating oil collecting part (10) for collecting the insulating oil from an inflow electric power machine on-line; A polyhedral membrane (20) for passing only the oil gas from the insulating oil collected in the insulating oil collecting part (10); A gas chamber part 40 for measuring the gas flowing through the polyhedral membrane 20 using the electrochemical gas sensor 30 and discharging the residual gas to the atmosphere; A gas concentration determination unit (50) for determining a gas concentration from an output of the electrochemical gas sensor (30) measured for a predetermined time; Wherein the gas detection unit detects the presence of the gas.          [2] The method according to claim 1, wherein the insulating oil collecting part (10)          Solenoid valves (61, 62) for drawing out the insulating oil from the inflow-type electric power machine and circulating and stopping the insulating oil in a predetermined order and an insulating oil cell (80) for storing the circulating insulating oil for extracting the dissolved gas in the insulating oil for a certain period of time;             And a temperature controller (90) for maintaining the temperature of the insulating oil in the insulating oil cell (80) constant.              The high-sensitivity on-line gas detection apparatus according to any one of claims 1 to 3, wherein the polyhedral membrane (20) permeates only gas in insulating oil and is installed in insulating oil stored in the insulating oil cell (80).       The high sensitivity on-line gas detection apparatus according to claim 1, wherein the polyhedral membrane (20) has two or more unit membranes (27).       [5] The apparatus of claim 4, wherein the unit membrane (27)       A flat membrane polymer membrane (92) for blocking inflow of the insulating oil and passing only the oil gas;         A stainless mesh screen 94 attached to the opposite side of the surface of the flat film polymer membrane 92 in contact with the insulating oil so as to withstand hydraulic pressure;         An upper guide ring 96 and a lower guide ring 98 respectively installed on the upper and lower portions of the flat polymer membrane 92 and the stainless mesh screen 94;         And a ring-shaped polymer film (160) for adhesion enhancement provided on the upper and lower sides of the membrane (92) to improve adhesion performance of the flat membrane polymer membrane (92).         6. The stainless steel mesh screen (94) according to claim 5, wherein the stainless steel mesh screen (94) is formed with a plate membrane (100) having a predetermined width at a rim portion contacting the flat membrane polymer membrane (92) or the ring- Sensitive gas detector.        The gas chamber (40) according to claim 1, wherein the gas chamber (40) is formed with a gas chamber (42) in which the gas chamber heater (45) is embedded, and the solenoid valves (63, 64, 65) Wherein a pump (72) is formed at a lower portion of the solenoid valve (65), and a porous membrane is provided for naturally discharging inflow gas during measurement.               The apparatus of claim 7, wherein the porous membrane is installed in the air hole (120).   2. The gas sensing apparatus according to claim 1, wherein the gas concentration determination unit (50) comprises a control and computing device (130), a communication device (140), and a display device (150).        The gas concentration determining unit (50) according to any one of claims 1 to 9, wherein the gas concentration determining unit (50) determines a maximum value from the output of the electrochemical gas sensor (30) measured for a predetermined time and determines a gas concentration Wherein the gas detection unit detects the gas concentration of the gas.

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