KR20220139625A - Measuring device for transformer - Google Patents

Abstract

The present invention relates to a measuring device for a transformer comprising: a valve part mounted on the transformer; a connection part connected to the valve part; a detection part that is inserted into the transformer through the connection part and divided on a straight line to double-detect a state of an insulating oil; and a control part that analyzes the state of the insulating oil by receiving a detection signal of the detection part, wherein a gas included in the insulating oil, a temperature of the insulating oil, and a moisture included in the insulating oil can be detected at the same time. Therefore, the present invention is capable of enabling the temperature of the insulating oil and the moisture included in the insulating oil to be measured simultaneously.

Description

MEASURING DEVICE FOR TRANSFORMER

The present invention relates to a gas measuring device, and more particularly, to a transformer measuring device inserted into a transformer to improve a gas analysis reaction rate for insulating oil inside the transformer.

In general, when an abnormal phenomenon occurs in a transformer, insulating materials such as insulating oil and insulating paper in contact with these heat sources are thermally decomposed to generate hydrocarbon-based gas. Transformer insulation generates a specific gas depending on the temperature of the abnormal part and the type of insulation, and the amount of gas generated and the composition ratio between the mixed gas differ depending on the duration of the abnormal state and the heating temperature. By detecting the composition and amount, it is possible to accurately diagnose the abnormal condition inside the transformer. Such an analysis method is called a gas-in-oil analysis method, and in recent years, interest in gas sensor-type gas-in-oil analysis equipment is rapidly increasing in consideration of economic feasibility.

Most of the currently commercialized gas-in-oil analyzers use gas chromatography, photoacoustic spectroscopy, infrared spectroscopy, etc., which are driving methods of precision analyzers used in laboratories, to diagnose the state of the transformer in real time. In these methods, the insulating oil inside the transformer is forcibly transported and collected from the transformer using piping and a circulation pump, and the concentration of each dissolved gas composition is analyzed in real time, and the insulating oil that has been analyzed is returned and injected back into the transformer.

However, this analysis method has a problem in that it is difficult to be applied to the entire power transformer because of the complicated installation and inconvenience in terms of maintenance such as oil leakage. Therefore, there is a need to improve it.

Background art of the present invention is disclosed in Korean Patent Application Laid-Open No. 2002-0043763 (published on June 12, 2002, title of the invention: a transducer for measuring insulation oil deterioration of a distribution transformer and a deterioration measurement system using the same).

The present invention has been devised to improve the above problems, and it is an object of the present invention to provide a measuring device for a transformer that is inserted into a transformer to improve a gas analysis reaction rate for insulating oil inside the transformer.

A measuring device for a transformer according to the present invention includes: a valve unit mounted on the transformer; a connection part connected to the valve part; a sensing unit inserted into the transformer through the connection unit and divided on a straight line to double detect the insulating oil state; and a control unit that receives the sensing signal of the sensing unit and analyzes the insulating oil state.

The connecting portion includes a connecting flange portion coupled to the valve portion; a connection pipe part formed on the connection flange part and passing the sensing part; and a connection airtight part for making the connection pipe part and the sensing part in close contact with each other.

The connection part is formed in the connection pipe part, the connection collection part for collecting the insulating oil flowing between the connection pipe part and the sensing part; characterized in that it further comprises.

The sensing unit may include: a first sensing unit sensing a gas concentration of the insulating oil; a second sensing unit connected to the first sensing unit and sensing the temperature and moisture of the insulating oil; and a third sensing unit connected to the second sensing unit and connected to the control unit through the connecting unit.

The first sensing unit may include a first sensing case unit; a first sensing cap unit covering the front end of the first sensing case unit and having a plurality of holes to block the inflow of foreign substances; a first detection filter part built in the first detection case part and filtering gas from the insulating oil that has passed through the first detection cap part; and a first detection sensor unit embedded in the first detection case unit and measuring the gas passing through the first detection filter unit.

The first detection sensor unit includes a first sensor housing unit mounted on the first sensing case unit; a first sensor substrate part mounted on the first sensor housing part; a first sensor measuring unit mounted on the first sensor substrate and measuring gas; and a first sensor transmission unit passing through the second sensing unit and electrically connecting the first sensor substrate unit and the control unit.

The first sensor transmission unit includes a first transmission pipe passing through the second sensing unit and connecting the first sensing unit and the third sensing unit; and a first transmission cable unit having one end connected to the first sensor substrate and connected to the control unit through the first transmission pipe unit.

The first sensor transmission unit may further include a first transmission flow path unit embedded in the first transmission pipe unit to provide air.

The second sensing unit may include: a second sensing case unit connecting the first sensing unit and the third sensing unit; a second sensing hole formed in the second sensing case and having a plurality of holes to block the inflow of foreign substances; and a second sensing sensor unit embedded in the second sensing case unit and sensing the temperature and moisture of the insulating oil passing through the second sensing hole unit.

The second sensing sensor unit includes a second sensor housing unit mounted on the second sensing case unit; a second sensor substrate part mounted on the second sensor housing part; a second sensor measuring unit mounted on the second sensor substrate and measuring temperature and moisture; a second sensor transmission unit electrically connecting the second sensor substrate unit and the control unit; and a second sensor cover part covering the front end of the second sensor housing part and having a plurality of holes to block the inflow of foreign substances.

In the measuring device for a transformer according to the present invention, the sensing unit is inserted into the transformer through the connection unit coupled to the valve unit, and the sensing unit increases the amount of gas contained in the insulating oil to increase the gas detection reaction speed as well as improve the gas sensing reaction rate. Temperature and moisture contained in insulating oil can be measured simultaneously.

1 is a view schematically showing a measuring device for a transformer according to an embodiment of the present invention.
2 is a view schematically showing a connection part according to an embodiment of the present invention.
3 is a diagram schematically illustrating a sensing unit according to an embodiment of the present invention.
4 is a diagram schematically illustrating a first sensing unit according to an embodiment of the present invention.
5 is a diagram schematically illustrating a second sensing unit according to an embodiment of the present invention.

Hereinafter, an embodiment of a measuring device for a transformer according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a view schematically showing a measuring device for a transformer according to an embodiment of the present invention. Referring to FIG. 1 , the measuring apparatus 1 for a transformer according to an embodiment of the present invention includes a valve unit 10 , a connection unit 20 , a sensing unit 30 , and a control unit 40 .

The valve unit 10 is mounted on the transformer 100 . For example, the valve unit 10 may be a drain valve coupled to the outside of the transformer 100 . The valve unit 10 may open and close the flow path by a user's manipulation or motor driving.

The connection part 20 is connected to the valve part 10 . For example, the connection part 20 may be coupled to one side of the valve part 10 by making surface contact with the valve part 10 . When the valve part 10 is opened, the insulating oil of the transformer 100 may be moved to the connection part 20 through the valve part 10 .

The sensing unit 30 is inserted into the transformer 100 through the connection unit 20 and is divided on a straight line to double detect the insulating oil state. For example, the sensing unit 30 may pass through the connection unit 20 , and two sensing means partitioned in the longitudinal direction may detect the state of the insulating oil. The sensing unit 30 may sense the gas concentration contained in the insulating oil and, at the same time, detect the temperature of the insulating oil and moisture contained in the insulating oil.

The control unit 40 receives the sensing signal of the sensing unit 30 and analyzes the insulating oil state. For example, the control unit 40 receives the sensing signal of the sensing unit 30 through wiring or through communication, and analyzes the obtained information and performs statistical processing to provide related information to a remote control room. In addition, a display unit 41 capable of checking basic data may be separately provided so that a substation field worker can simply check the state of the transformer 100 . Meanwhile, the control unit 40 is provided at the rearmost end of the sensing unit 30 , and may be directly coupled to the sensing unit 30 or may be connected at a predetermined angle with respect to the central axis using a fastening jig.

2 is a view schematically showing a connection part according to an embodiment of the present invention. Referring to FIG. 2 , the connection part 20 according to an embodiment of the present invention includes a connection flange part 21 , a connection pipe part 22 , and a connection airtight part 23 .

The connecting flange part 21 is coupled to the valve part 10 . For example, the edge of the connection flange portion 21 may be in surface contact with one end of the valve portion 10 to be bolted.

The connection pipe part 22 is formed in the connection flange part 21, and the sensing part 30 passes through it. For example, the connection pipe part 22 extends from the connection flange part 21 and has a space therein, and extends from the first connection pipe part 221 communicating with the valve part 10 , and the first connection pipe part 221 . and may include a second connector part 222 having a smaller inner diameter than the first connector part 221 .

The connection airtight part 23 brings the connection pipe part 22 and the sensing part 30 into close contact. For example, the connection airtight part 23 is formed to surround the outside of the second connection pipe part 222 , and the second connection pipe part when the connection airtight part 23 tightens the end of the deformable second connection pipe part 222 . 222 may be in close contact with the sensing unit 30 . In this case, an O-ring may be disposed between the second connector part 222 and the sensing part 30 .

The connection unit 20 according to an embodiment of the present invention may further include a connection collection unit 24 . The connection collection unit 24 is used when sampling insulating oil for the purpose of diagnosing the chemical state of the transformer 100 . That is, the inner diameter of the connecting pipe part 22 is designed to be larger than the outer diameter of the sensing part 30, so that the insulating oil inside the transformer flows into the space between them, and the introduced insulating oil can be extracted through the connection collecting part 24. . For example, the connection collection part 24 may be formed in the first connection pipe part 221 .

3 is a diagram schematically illustrating a sensing unit according to an embodiment of the present invention. Referring to FIG. 3 , the sensing unit 30 according to an embodiment of the present invention includes a first sensing unit 31 , a second sensing unit 32 , and a third sensing unit 33 . They may be arranged coaxially and sequentially.

The first detection unit 31 detects the gas concentration of the insulating oil. For example, the first sensing unit 31 may be disposed at the front end of the sensing unit 30 , and may be inserted into the transformer 100 to detect a gas included in the insulating oil.

The second sensing unit 32 is connected to the first sensing unit 31 and senses the temperature and moisture of the insulating oil. For example, the second sensing unit 32 is screw-coupled to the first sensing unit 31 , and is partitioned from the first sensing unit 32 so that insulating oil may be introduced therein. The second sensing unit 32 may be inserted into the transformer 100 to detect the temperature of the insulating oil and moisture contained in the insulating oil, respectively.

The third sensing unit 33 is connected to the second sensing unit 32 , and passes through the connecting unit 20 to be connected to the control unit 40 . For example, the third sensing unit 33 may have a pipe shape, and the front end may be screw-coupled to the second sensing unit 32 . Various wirings or flow paths may be arranged in the space formed in the third sensing unit 33 .

4 is a diagram schematically illustrating a first sensing unit according to an embodiment of the present invention. Referring to FIG. 4 , the first sensing unit 31 according to an embodiment of the present invention includes a first sensing case unit 311 , a first sensing cap unit 312 , a first sensing filter unit 313 , and , and a first detection sensor unit 314 .

The first detection case part 311 has a pipe shape, and the second detection part 32 is inserted into the rear end part and screwed together.

The first sensing cap unit 312 covers the front end of the first sensing case unit 311 , and a plurality of holes are formed to block the inflow of foreign substances. For example, the first sensing cap unit 312 may be screwed to the front end of the first sensing case unit 311 .

The first detection filter part 313 is built in the first detection case part 311 and filters gas from the insulating oil that has passed through the first detection cap part 312 . For example, a membrane filter for separating gas from insulating oil is used as the first detection filter unit 313 , and any filter having a function of blocking insulating oil and passing gas may be used. In order to prevent contamination and damage and to increase the insulating oil and gas separation effect, the first detection filter unit 313 may constitute a plate-type membrane filter of two or more layers to perform multiple filtering. Meanwhile, the front insulating oil inflow area of the first sensing case unit 311 and the area of the first sensing filter unit 313 may be designed to be the same. As a result, the amount of gas collected is increased as much as possible to improve the reaction speed of the first detection sensor unit 314 .

The first detection sensor unit 314 is built into the first detection case unit 311 and measures the gas that has passed through the first detection filter unit 313. This first detection sensor unit 314 analyzes the gas in oil For example, since the first detection sensor unit 314 is very small, it is attached to a small substrate to fix the sensor and facilitate connection to the control module circuit. At this time, the size and shape of the substrate is not particularly limited, and various changes are possible in consideration of the number, method, size and shape, etc. On the other hand, in the case of a semiconductor type sensor, in order to maintain the sensor substrate at a constant temperature, the lower part of the sensor substrate In the case of a gas sensor array equipped with a plurality of gas sensors, the concentration value conversion function and control function can be performed in multiple ways for each sensor, while maintaining a constant oxygen partial pressure. and a circulation path for circulating internal and external gases for smooth dissolved gas separation.A micro air circulation pipe is connected to the ends of the air inlet and outlet of the circulation path so that continuous gas circulation is possible with the driving force of the micro air pump. The circulation flow path to which air is supplied so that the temperature of the gas concentration measurement space can be maintained constant can be heated by heating wire heating, induction heating, or bath heating using the insulating oil inside the transformer. Air above a certain temperature can also be supplied to the air supply to the gas concentration measurement space between the first detection sensor unit 314 and the first detection filter unit 313. When the pressure rises, the inflow of dissolved gas from the insulating oil is adversely affected. Therefore, the air pump may be installed at the outlet of the air circulation path In addition, when the first detection sensor unit 314 includes an oxygen or nitrogen gas sensor to measure the concentration of oxygen in oil, for gas circulation If the driving voltage of the air pump is linked with the oxygen concentration in oil, the oxygen partial pressure in the gas concentration measurement space can be kept constant.

The first detection cap part 312, the first detection filter part 313, and the first detection sensor part 314 are sequentially arranged, and before and after each O-ring to secure the oil tightness of the insulating oil and the airtightness of the dissolved gas. This can be applied.

The first detection sensor unit 314 according to an embodiment of the present invention includes a first sensor housing unit 411 , a first sensor substrate unit 412 , a first sensor measurement unit 413 , and a first sensor. and a transmission unit 414 .

The first sensor housing unit 411 is mounted on the first sensing case unit 311 . For example, the first sensor housing unit 411 may be disposed at the rear of the first sensing filter unit 313 , and may be caught and fixed inside the first sensing case unit 311 .

The first sensor substrate part 412 is mounted on the first sensor housing part 411 . One or more first sensor measuring units 413 are mounted on the first sensor substrate unit 412 and measure gas.

The first sensor transmission unit 414 passes through the second sensing unit 32 , and electrically connects the first sensor substrate unit 412 and the control unit 40 . More specifically, the first sensor transmission unit 414 includes a first transmission pipe unit 421 and a first transmission cable unit 422 .

The first transmission pipe part 421 passes through the second detection part 32 , and connects the first detection part 31 and the third detection part 33 . For example, the first transmission pipe part 421 may pass through the first detection case part 311 and be coupled to the first agent detection sensor part 314 .

One end of the first transmission cable unit 422 is connected to the first sensor substrate unit 412 , and is connected to the control unit 40 through the second sensing unit 32 through the first transmission pipe unit 421 . In this case, the first transmission pipe unit 421 may protect the first transmission cable unit 422 from the insulating oil flowing into the second sensing unit 32 .

The first sensor transmission unit 414 may further include a first transmission flow path unit 423 . The first transmission flow path part 423 is built into the first transmission pipe part 421 to provide air. For example, external air may be supplied to the first detection sensor unit 314 through the first transmission flow path unit 423 and then discharged to the outside. The first transmission passage 423 may include an inlet pipe, an outlet pipe, and a circulation pipe, the outlet pipe being located in the control unit 40 , and the pump may be disposed in the outlet pipe. And, the outside air in winter may be heated and supplied through a heater formed in the inlet pipe.

5 is a diagram schematically illustrating a second sensing unit according to an embodiment of the present invention. Referring to FIG. 5 , the second sensing unit 32 according to an embodiment of the present invention includes a second sensing case unit 321 , a second sensing hole unit 322 , and a second sensing sensor unit 323 . include

The second sensing case unit 321 connects the first sensing unit 31 and the third sensing unit 33 . For example, the second sensing case unit 321 may be inserted into the first sensing unit 31 and screw-coupled, and the third sensing unit 33 may be inserted into the second sensing case unit 321 and screw-coupled. .

The second sensing hole part 322 is formed in the second sensing case part 321 and a plurality of holes are formed to block the inflow of foreign substances. For example, the second sensing case part 321 may have a cylindrical pipe shape, and the second sensing hole part 322 may be formed on the surface of the second sensing case part 321 to pass the insulating oil and block the inflow of foreign substances.

The second sensing sensor unit 323 is built into the second sensing case unit 321 , and detects the temperature and moisture of the insulating oil that has passed through the second sensing hole unit 322 . For example, the second detection sensor unit 323 may include a sensor for measuring the temperature of the insulating oil and a sensor for measuring the moisture contained in the insulating oil.

More specifically, the second detection sensor unit 323 includes a second sensor housing unit 521 , a second sensor substrate unit 522 , a second sensor measurement unit 523 , and a second sensor transmission unit 524 . ) and a second sensor cover part 525 .

The second sensor housing unit 521 is mounted on the second sensing case unit 321 . For example, the second sensor housing unit 521 may have a cylindrical shape and be coupled to the rear end of the second sensing case unit 321 . A plurality of holes may be formed in the second sensor housing unit 521 to pass the insulating oil and block the inflow of foreign substances.

The second sensor substrate part 522 is mounted on the second sensor housing part 521 . For example, the second sensor substrate unit 522 may be fixedly installed on the second sensor housing unit 521 . The second sensor substrate unit 522 may be protected by a separate cover to limit direct contact with the insulating oil.

The second sensor measuring unit 523 is mounted on the second sensor substrate unit 522 and measures temperature and moisture. For example, the second sensor measuring unit 523 may include a sensor for measuring the temperature of the insulating oil and a sensor for measuring the moisture contained in the insulating oil.

The second sensor transmission unit 524 electrically connects the second sensor substrate unit 522 and the control unit 40 . For example, the second sensor transmission unit 524 may be a cable connecting the second sensor substrate unit 522 and the control unit 40 , or may be a pipe for guiding the cable.

The second sensor cover part 525 covers the front end of the second sensor housing part 521 , and a plurality of holes are formed to block the inflow of foreign substances. For example, the second sensor cover unit 525 may be screwed to the front end of the second sensor housing unit 521 .

The installation of the measuring device for a transformer according to an embodiment of the present invention having the structure as described above and the measuring process of the insulating oil state will be described as follows.

The valve unit 10 is mounted on the transformer 100 , and the connection unit 20 is mounted on the valve unit 10 . The sensing unit 30 is assembled such that the first sensing unit 31, the second sensing unit 32, and the third sensing unit 33 are sequentially arranged on a straight line, and the third sensing unit 33 is the control unit. (40) is connected. The first sensing unit 31 and the second sensing unit 32 pass through the connection unit 20 , and when the valve unit 10 opens the flow path, it passes through the valve unit 10 and is inserted into the transformer 100 .

When the first sensing unit 31 is inserted into the transformer 100 , insulating oil is introduced through the first sensing cap unit 312 formed at the front end of the first sensing case unit 311 . When the gas contained in the introduced insulating oil passes through the first detection filter unit 313 , the first detection sensor unit 314 detects the concentration of the gas. The value measured by the first detection sensor unit 314 is transmitted to the control unit 40, and the control unit 40 analyzes the measurement value and transmits it to the control room.

When the second sensing unit 32 is inserted into the transformer 100 together with the first sensing unit 31 , the insulating oil flows into the second sensing case unit 321 . The second detection sensor unit 323 measures the temperature of the introduced insulating oil and moisture contained in the insulating oil. The value measured by the second detection sensor unit 323 is transmitted to the control unit 40, and the control unit 40 analyzes the measured value and transmits it to the control room.

In the measuring device 1 for a transformer according to an embodiment of the present invention, the sensing unit 30 is inserted into the transformer 100 through the connection unit 20 coupled to the valve unit 10 , the sensing unit 30 . increases the amount of gas contained in the insulating oil to increase the gas detection reaction rate, and can measure the temperature of the insulating oil and the moisture contained in the insulating oil at the same time.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and those of ordinary skill in the art to which various modifications and equivalent other embodiments are possible. will understand Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

10: valve part 20: connection part
21: connection flange part 22: connection pipe part
23: connection secret part 24: connection collection part
30: sensing unit 31: first sensing unit
32: second sensing unit 33: third sensing unit
40: control unit 100: transformer
311: first detection case portion 312: first detection cap portion
313: first detection filter unit 314: first detection sensor unit
321: second sensing case part 322: second sensing hole part
323: second detection sensor unit

Claims (10)

a valve unit mounted on the transformer;
a connection part connected to the valve part;
a sensing unit inserted into the transformer through the connection unit and divided on a straight line to double detect the insulating oil state; and
Transformer measuring device comprising a; a control unit for receiving the sensing signal of the sensing unit to analyze the insulating oil state.
According to claim 1, wherein the connecting portion
a connection flange unit coupled to the valve unit;
a connection pipe part formed on the connection flange part and passing the sensing part; and
and a connection airtight part for making the connection pipe part and the sensing part in close contact with each other.
3. The method of claim 2, wherein the connecting portion
The measuring device for transformer, characterized in that it further comprises a; is formed in the connection pipe portion, the connection collection unit for collecting the insulating oil flowing between the connection pipe portion and the sensing unit.
The method of claim 1, wherein the sensing unit
a first sensing unit for sensing the gas concentration of the insulating oil;
a second sensing unit connected to the first sensing unit and sensing the temperature and moisture of the insulating oil; and
and a third sensing unit connected to the second sensing unit and connected to the control unit through the connecting unit.
5. The method of claim 4, wherein the first sensing unit
a first sensing case unit;
a first sensing cap unit covering the front end of the first sensing case unit and having a plurality of holes to block the inflow of foreign substances;
a first detection filter part built in the first detection case part and filtering gas from the insulating oil that has passed through the first detection cap part; and
and a first detection sensor unit embedded in the first detection case unit and measuring the gas passing through the first detection filter unit.
The method of claim 5, wherein the first detection sensor unit
a first sensor housing unit mounted on the first sensing case unit;
a first sensor substrate part mounted on the first sensor housing part;
a first sensor measuring unit mounted on the first sensor substrate and measuring gas; and
and a first sensor transmission unit passing through the second sensing unit and electrically connecting the first sensor substrate unit and the control unit.
The method of claim 6, wherein the first sensor transmission unit
a first transmission pipe passing through the second sensing unit and connecting the first sensing unit and the third sensing unit; and
and a first transmission cable unit having one end connected to the first sensor substrate and connected to the control unit through the first transmission pipe.
The method of claim 7, wherein the first sensor transmission unit
The measuring apparatus for a transformer further comprising a; a first transmission flow path part built in the first transmission pipe to provide air.
5. The method of claim 4, wherein the second sensing unit
a second sensing case unit connecting the first sensing unit and the third sensing unit;
a second sensing hole formed in the second sensing case and having a plurality of holes to block the inflow of foreign substances; and
and a second sensing sensor unit embedded in the second sensing case unit and sensing the temperature and moisture of the insulating oil passing through the second sensing hole unit.
The method of claim 9, wherein the second detection sensor unit
a second sensor housing unit mounted on the second sensing case unit;
a second sensor substrate part mounted on the second sensor housing part;
a second sensor measuring unit mounted on the second sensor substrate and measuring temperature and moisture;
a second sensor transmission unit electrically connecting the second sensor substrate unit and the control unit; and
and a second sensor cover part that covers the front end of the second sensor housing part and has a plurality of holes to block the inflow of foreign substances.

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