KR20230044839A - Apparatus for simulating of transformer and operating method thereof - Google Patents

Abstract

The present invention is characterized in comprising: a tank after degassing that stores pure insulating oil; a mixer tank that generates a standard oil by dissolving gases to be injected into the pure insulating oil supplied from the tank after degassing; and a test tank that mixes the standard oil supplied from the mixer tank and the pure insulating oil supplied from the tank after degassing, extracts one part among the mixed standard oil, and supplies to a gas chromatography and semiconductor gas sensor. Therefore, the present invention is capable of constructing a database for an electrical resistance value and a gas concentration.

Description

Transformer simulation device and its operating method {APPARATUS FOR SIMULATING OF TRANSFORMER AND OPERATING METHOD THEREOF}

The present invention relates to a transformer simulation system and its operating method, and more particularly, to a transformer simulation device capable of simulating a phenomenon in which gas generated inside a transformer is dissolved in insulating oil due to an abnormality inside the transformer and an operating method thereof. .

When a transformer is operated for a long time, major parts may deteriorate and abnormal phenomena such as partial discharge or arc may occur. Due to this abnormal phenomenon, when a high heat source comes into contact with a liquid or solid insulating material such as insulating oil or insulating paper, a specific gas may be generated by a chemical reaction. Most of the gas generated inside the transformer has the property of being dissolved in the insulating oil as it is, so by detecting the composition and concentration of the gas dissolved in the insulating oil of the transformer, it is possible to indirectly estimate the abnormal part, the contents and level of the abnormality in the transformer. , this analysis method is called Dissolved Gas Analysis (DGA).

On the other hand, methods for analyzing dissolved gas include a method using an analyzer such as GC (Chromatography), PAS (Photo Acoustic Spectroscopy), IR (Infrared Spectroscopy), and a method using a semiconductor gas sensor. Here, in the case of a semiconductor gas sensor, electrical characteristics and sensitivity vary greatly depending on the environment in which it is used, so whenever the environment in which it is used changes, the performance of the sensor in the environment and the properties obtained through the semiconductor gas sensor are evaluated as gas concentration. Extensive use is possible only when the derivation of an algorithm for conversion to .

Most of the application areas of semiconductor gas sensors developed so far are limited to detecting specific gases (flammable/harmful gases, etc.) in the air. Some of the air test devices that can be used are being developed and utilized. However, there is a problem that it is impossible to secure accurate data for analyzing the gas dissolved in the insulating oil of the transformer only with these existing test apparatuses.

The background art of the present invention is disclosed in 'insulating oil state diagnosis device' of Korean Patent Registration No. 10-1874983 (2018.06.29.).

The present invention was devised to solve the above problems, and an object according to one aspect of the present invention is a transformer simulation device capable of simulating a phenomenon in which gas generated inside a transformer is dissolved in insulating oil due to an abnormality inside the transformer, and the same It's about providing a way to work.

Transformer simulation device according to an embodiment of the present invention includes a degassing tank for storing pure insulating oil; a mixer tank for generating standard oil by dissolving gases to be injected in the pure insulating oil supplied from the degassing tank; and a test tank for mixing the standard oil supplied from the mixer tank with pure insulating oil supplied from the degassing tank, extracting a part of the mixed standard oil, and supplying it to gas chromatography and a semiconductor gas sensor. It is characterized by doing.

A method of operating a transformer simulation device according to an embodiment of the present invention includes (a) supplying pure insulating oil stored in a tank after degassing to a mixer tank; (b) generating standard oil by dissolving the gas to be injected into the pure insulating oil stored in the mixer tank; (c) supplying the standard oil stored in the mixer tank and the pure insulating oil stored in the degassed tank to a test tank; (d) mixing the standard oil and the pure insulating oil; and (e) extracting some of the mixed standard oil and supplying it to gas chromatography and a semiconductor gas sensor.

According to one aspect of the present invention, by simulating a phenomenon in which gas generated inside the transformer is dissolved in insulating oil due to an abnormality inside the transformer, insulating oil in which gas generated due to an abnormality inside the transformer is dissolved can be effectively and reproducibly generated. .

According to another aspect of the present invention, the concentration of the gas dissolved in the insulating oil is measured through gas chromatography, the electrical resistance value according to the gas dissolved in the insulating oil is measured through a semiconductor gas sensor, and the concentration of the measured gas and electricity By matching and storing resistance values, a database of electrical resistance value-gas concentration can be constructed.

According to another aspect of the present invention, the once-injected insulating oil can be repeatedly used by removing gas and moisture dissolved in the insulating oil used in the test through a purifier.

1 is a configuration diagram for explaining a transformer simulation device according to an embodiment of the present invention.
2 is an exemplary diagram for explaining a tank after degassing of a transformer simulation device according to an embodiment of the present invention.
3 is an exemplary diagram for explaining a mixer tank of a transformer simulation device according to an embodiment of the present invention.
4 is an exemplary view for explaining a test tank of a transformer simulation device according to an embodiment of the present invention.
5 is an exemplary view for explaining a degassing tank of a transformer simulation device according to an embodiment of the present invention.
6 and 8 and FIGS. 10 to 13 are flowcharts for explaining a method of operating a transformer simulation device according to an embodiment of the present invention.
7 is an exemplary diagram for explaining a process of supplying insulating oil and an inert gas by a transformer simulation device according to an embodiment of the present invention.
9 is an exemplary diagram for explaining that the concentration of gas dissolved in standard oil changes according to the operating time of an agitator provided in a test tank of a transformer simulation device according to an embodiment of the present invention.

Hereinafter, a transformer simulation system and its operating method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

1 is a configuration diagram for explaining a transformer simulation device according to an embodiment of the present invention.

Referring to FIG. 1, the transformer simulation device according to an embodiment of the present invention includes a degassing tank 101, a mixer tank 102, a test tank 103, a pre-degassing tank 104, a degassing device 105, First to fifth pumps 201 to 205, first to fourth discharge valves 301 to 304, first to fourth gas valves 311 to 314, first to third measuring valves 321 to 323 , an inert gas cylinder 401, a mass flow controller 402, a gas chromatography 403, a semiconductor gas sensor 404 and a control unit 500 may be included.

After degassing, the tank 101 may store pure insulating oil. Pure insulating oil may refer to insulating oil in which mixed gas is not dissolved. That is, insulating oil corresponding to the insulating oil filled in the transformer in a non-failure state may be stored in the tank 101 after degassing. It is preferable to set the capacity of the tank 101 after deaeration with a margin of about 10% greater than the sum of the capacities of the mixer tank 102 and the test tank 103.

Referring to FIG. 2 , a first pump 201 may be connected to one side of the tank 101 after degassing. The first pump 201 may be controlled by the control unit 500 to supply pure insulating oil stored in the tank 101 after degassing to the mixer tank 102 . A second pump 202 may be connected to one side of the tank 101 after degassing. The second pump 202 may be controlled by the control unit 500 to supply pure insulating oil stored in the degassed tank 101 to the test tank 103 . A first discharge valve 301 may be connected to one side of the tank 101 after degassing. The first discharge valve 301 may be controlled by the control unit 500 to discharge the inert gas filled in the tank 101 after degassing to the outside. A first gas valve 311 may be connected to one side of the tank 101 after degassing. The first gas valve 311 may be controlled by the control unit 500 to supply the inert gas stored in the inert gas cylinder 401 to the tank 101 after degassing.

The mixer tank 102 may dissolve at least one type of gas in pure insulating oil supplied from the degassing tank 101 to generate standard oil, which is insulating oil in which gas is dissolved. The mixer tank 102 may be a tank for producing insulating oil in which gas is dissolved in high concentration.

Referring to FIG. 3 , a first pump 201 may be connected to one side of the mixer tank 102 . The mixer tank 102 may be supplied with pure insulating oil stored in the tank 101 after degassing through the first pump 201 . A third pump 203 may be connected to one side of the mixer tank 102 . The third pump 203 may be controlled by the control unit 500 to supply the standard oil stored in the mixer tank 102 to the test tank 103 . A fourth pump 204 may be connected to one side of the mixer tank 102 . The fourth pump 204 may be controlled by the controller 500 to supply the standard oil stored in the mixer tank 102 to the tank 104 before degassing. A plurality of mass flow controllers 402 may be connected to one side of the mixer tank 102 . The mass flow controller 402 may be controlled by the control unit 500 to supply gas stored therein to the mixer tank 102 . A second discharge valve 302 may be connected to one side of the mixer tank 102 . The second discharge valve 302 is controlled by the control unit 500 to discharge the inert gas filled in the mixer tank 102 to the outside. A second gas valve 312 may be connected to one side of the mixer tank 102 . The second gas valve 312 may be controlled by the control unit 500 to supply the inert gas stored in the inert gas cylinder 401 to the mixer tank 102 . The mixer tank 102 may include a manometer 405 to measure internal pressure. A first measuring valve 321 may be connected to one side of the mixer tank 102 . The first measuring valve 321 may be controlled by the controller 500 to supply the standard oil stored in the mixer tank 102 to the gas chromatography 403 . The mixer tank 102 may include an agitator 406 . The stirrer 406 is controlled by the controller 500 to stir and mix the gas supplied from the mass flow controller 402 and the pure insulating oil supplied from the tank 101 after degassing.

Different types of gas may be stored in the plurality of mass flow controllers 402 (MFCs: Mass Flow Controllers). The mass flow controller 402 may store a gas corresponding to a gas generated when an internal abnormality of the transformer occurs. The mass flow controller 402 may include a gas cylinder in which gas is stored, and a regulator that provides pressure for supplying the gas. The regulator may be controlled by the controller 500 .

The test tank 103 mixes standard oil supplied from the mixer tank 102 and pure insulating oil supplied from the degassing tank 101 to adjust the concentration of gases dissolved in the standard oil, extracts some of the standard oil, It can be supplied to the gas chromatography 403 and the semiconductor gas sensor 404. The concentration of gas dissolved in the standard oil can be changed according to the user's settings. The test tank 103 may be connected to the pumps 202, 204, and 205, the valves 303, 313, 322, and 323, the gas chromatography 403, and the semiconductor gas sensor 404 in a flanged manner. The test tank 103 may simulate an actual aging transformer.

Referring to FIG. 4 , a third pump 203 may be connected to one side of the test tank 103 . The test tank 103 may receive standard oil from the mixer tank 102 through the third pump 203 . A second pump 202 may be connected to one side of the test tank 103 . The test tank 103 may be supplied with pure insulating oil from the tank 101 after degassing through the second pump 202 . A fifth pump 205 may be connected to one side of the test tank 103 . The fifth pump 205 may supply the standard oil stored in the test tank 103 to the tank 104 before degassing under the control of the control unit 500 . A third discharge valve 303 may be connected to one side of the test tank 103 . The third discharge valve 303 is controlled by the control unit 500 to discharge the inert gas filled in the test tank 103 to the outside. A third gas valve 313 may be connected to one side of the test tank 103 . The third gas valve 313 may be controlled by the control unit 500 to supply the inert gas stored in the inert gas cylinder 401 to the test tank 103 . A second measuring valve 322 may be connected to one side of the test tank 103 . The second measuring valve 322 may be controlled by the control unit 500 to supply the standard oil stored in the test tank 103 to the gas chromatography 403 . A third measuring valve 323 may be connected to one side of the mixer tank 102 . The third measuring valve 323 may be controlled by the controller 500 to supply standard oil stored in the test tank 103 to the semiconductor gas sensor 404 . Mixer tank 102 may include an agitator. The stirrer 407 is controlled by the control unit 500 to stir and mix the standard oil supplied from the mixer tank 102 and the pure insulating oil supplied from the degassed tank 101 together. The mixer tank 102 may include an upper pressure gauge 408 for measuring an internal upper pressure and a lower pressure gauge 409 for measuring an internal lower pressure. The test tank 103 may include a thermostat (not shown) for simulating the heating of the insulating oil during operation of an actual transformer. The thermostat can be controlled by the controller 500 to heat the test tank 103 .

The gas chromatography 403 may measure the concentration of each component of the gas dissolved in the standard oil. The gas chromatography 403 may receive standard oil from the mixer tank 102 through the first measuring valve 321 . The gas chromatography 403 may receive standard oil from the test tank 103 through the second measuring valve 322 . According to another embodiment, after extracting some of the standard oil, it may be introduced into the gas chromatography 403 using a vial. In the above-described embodiment, it has been described that the concentration of each component of the gas dissolved in the standard oil is measured using the gas chromatography 403, but other well-known gas concentration analyzers may be used.

The semiconductor gas sensor 404 may measure the electrical resistance value for each component of the gas dissolved in the standard oil. The semiconductor gas sensor 404 may receive standard oil from the test tank 103 through the third measuring valve 323 . The semiconductor gas sensor 404 may output the electrical resistance value by the standard oil in contact with the surface to the control unit 500. When the semiconductor gas sensor 404 does not use a method in direct contact with the standard oil, the semiconductor gas sensor 404 serves to separate gas and liquid in order to separate only gas from the extracted standard oil. It may include a base oil separation membrane or a dissolved gas collecting device. Meanwhile, in the above-described embodiment, the gas sensor is described as measuring the electrical resistance value for each component of the gas dissolved in the standard oil, but it is okay to measure other physical property values (eg, current value) instead of the electrical resistance value.

The pre-degassing tank 104 may store the standard oil discharged from the test tank 103. The standard oil stored in the test tank 103 may be discharged at the end of the test or to perform the test under other conditions, and the tank 104 before degassing is connected to the standard oil discharged from the test tank 103 through the degassing device 105. Standard oil can be temporarily stored prior to removal of dissolved gases.

Referring to FIG. 5 , a fourth pump 204 may be connected to one side of the tank 104 before degassing. The pre-degassing tank 104 may receive and store the standard oil discharged from the mixer tank 102 through the fourth pump 204 . A fifth pump 205 may be connected to one side of the tank 104 before degassing. The pre-degassing tank 104 may receive and store the standard oil discharged from the test tank 103 through the fifth pump 205 . A degassing device 105 may be connected to one side of the tank 104 before degassing. A fourth discharge valve 304 may be connected to one side of the tank 104 before degassing. The fourth discharge valve 304 is controlled by the control unit 500 to discharge the inert gas filled in the tank 104 before degassing to the outside. A fourth gas valve 314 may be connected to one side of the tank 104 before degassing. The fourth gas valve 314 may be controlled by the control unit 500 to supply the inert gas stored in the inert gas cylinder 401 to the test tank 103 .

The degassing device 105 may remove gases and moisture dissolved in the standard oil discharged from the pre-degassing tank 104 to generate pure insulating oil, and discharge the generated pure insulating oil to the tank 101 after degassing. The degassing device may be a refiner for removing gas and water dissolved in the standard oil.

The inert gas cylinder 401 may be connected to the post-degassing tank 101, the mixer tank 102, the test tank 103, and the pre-degassing tank 104, respectively, and when insulating oil is discharged from each tank, the discharged insulating oil Inert gas can be supplied to the corresponding tank by the volume of That is, when insulating oil is discharged from a specific tank, the inert gas cylinder 401 supplies inert gas to the corresponding tank as much as the volume of insulating oil discharged from the corresponding tank, thereby preventing negative pressure from occurring in the corresponding tank when insulating oil is discharged from the corresponding tank, , it can prevent direct contact between the insulating oil and the outside atmosphere. Meanwhile, dry air may be used instead of inert gas.

The control unit 500 may control driving of each pump 201 to 205 provided in the transformer simulation device. The control unit 500 may control opening and closing of valves 301 to 304, 311 to 314, and 321 to 323 provided in the transformer simulation device. The controller 500 includes a gas chromatography 403, a semiconductor gas sensor 404, an inert gas cylinder 401, a mass flow controller 402, agitators 406 to 407, a thermostat and a degassing device 105. drive can be controlled. The controller 500 may be a kind of server that controls the operation of the transformer simulation device.

The control unit 500 matches the concentration of each component of the gas dissolved in the standard oil measured through the gas chromatography 403 and the electrical resistance value of each component of the gas dissolved in the standard oil measured through the semiconductor gas sensor 404. and store it in the database.

The control unit 500 may manually and automatically control each valve and pump through PLC (Programmable Logic Controller) control.

In the above-described embodiment, it has been described that the transformer simulation device can dissolve gas in insulating oil and extract and analyze a part of it, but the present invention dissolves gas in other oil and liquid samples instead of insulating oil, extracts a part of it, can also be analyzed.

6 is a flowchart illustrating a process of generating standard oil by a transformer simulation device according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 6, a process of generating standard oil by the transformer simulation device according to an embodiment of the present invention will be described.

First, the controller 500 may drive the first pump 201 (S601). That is, the controller 500 may supply the pure insulating oil stored in the tank 101 after degassing to the mixer tank 102 . At the same time, the controller 500 may open the second discharge valve 302 connected to the mixer tank 102 . That is, the controller 500 may discharge the inert gas filled in the mixer tank 102 to the outside. When the mixer tank 102 is not filled with insulating oil, since the inside of the mixer tank 102 is filled with an inert gas such as argon or nitrogen, in order to supply pure insulating oil to the mixer tank 120, the mixer tank 102 It is necessary to discharge the inert gas filled in to the outside.

Subsequently, the control unit 500 may determine whether the internal pressure of the mixer tank 102 is equal to or higher than a preset first reference pressure (S603). The controller 500 may measure the internal pressure of the mixer tank 102 through a pressure gauge. The first reference pressure is a threshold value for determining whether sufficient pure insulating oil is supplied to the mixer tank 102 and may be preset by a user.

When it is determined that the internal pressure of the mixer tank 102 is equal to or greater than the first reference pressure, the controller 500 may stop driving the first pump 201 (S605). At the same time, the controller 500 may close the second discharge valve 302 . That is, when the internal pressure of the mixer tank 102 is equal to or higher than the first set pressure, the control unit 500 may stop supplying pure insulating oil and discharging inert gas.

Meanwhile, when pure insulating oil stored in the tank 101 after degassing is supplied to the mixer tank 102, the controller 500 may open the first gas valve 311. The control unit 500 supplies inert gas equal to the volume of the pure insulating oil discharged from the degassing tank 101 to the degassing tank 101, so that pure insulating oil moves from the degassing tank 101 to the mixer tank 102. As a result, the negative pressure of the tank 101 after degassing may be eliminated. 7 shows a process of supplying insulating oil and inert gas.

Subsequently, the control unit 500 selects one of the injection target gases set by the user as a target gas (S607), and the target gas is injected into the mixer tank 102 through the mass flow controller 402 corresponding to the selected target gas. It can be injected (S609). The type and injection amount of gas to be supplied to the mixer tank 102 may be set in advance, and the control unit 500 may supply the gas to the mixer tank 102 according to the set type and injection amount. Meanwhile, when gas is injected into the mixer tank 102 through the mass flow controller 402, since the internal pressure of the mixer tank 102 rises, the control unit 500 controls the pressure higher than the internal pressure of the tank for continuous gas injection. The pressure can be set to the pressure of the regulator. The gas injection amount can be calculated by multiplying the set flow rate of the mass flow controller 402 and the regulator driving time.

Subsequently, the controller 500 may drive the first pump 201 (S611). That is, the controller 500 may additionally supply pure insulating oil to the mixer tank 102 . A high pressure is required to dissolve the gas supplied to the mixer tank 102 in the insulating oil. The controller 500 may increase the internal pressure of the mixer tank 102 by additionally supplying pure insulating oil to the mixer tank 102 . The amount of pure insulating oil additionally supplied in this process may correspond to a negligible amount.

Subsequently, the control unit 500 may determine whether the internal pressure of the mixer tank 102 is equal to or greater than a preset second reference pressure (S613).

When it is determined that the internal pressure of the mixer tank 102 is equal to or greater than the second reference pressure, the controller 500 may stop driving the first pump 201 (S615). That is, when the internal pressure of the mixer tank 102 is equal to or higher than the second reference pressure, the controller 500 may stop additional supply of pure insulating oil. The second reference pressure is preferably set lower than the internal pressure limit of the mixer tank 102 .

Subsequently, the control unit 500 may drive the agitator 406 provided in the mixer tank 102 (S617). That is, the control unit 500 may drive the agitator 406 so that the pure insulating oil stored in the mixer tank 102 and the gas are smoothly and quickly mixed.

Subsequently, the control unit 500 may determine whether or not the driving time of the agitator 406 has passed a first preset time (S619).

When it is determined that the driving time of the agitator has passed the first set time, the controller 500 may stop driving the agitator (S621).

Subsequently, the control unit 500 may determine whether the internal pressure of the mixer tank 102 is equal to or less than a preset third reference pressure (S623). The third reference pressure may be the internal pressure of the mixer tank 102 immediately before injection of the target gas. In general, as the agitator is driven, the gas is dissolved in the pure insulating oil and the internal pressure of the mixer tank 102 is reduced. The control unit 500 may determine whether the pressure inside the mixer tank 102 has decreased to a level immediately before the target gas is injected in order to determine whether the insulating oil is saturated with the target gas.

When it is determined that the internal pressure of the mixer tank 102 is equal to or less than the third reference pressure, step S607 may be returned. That is, the controller 500 may repeatedly perform a process of selecting one of the remaining injection target gases as a new target gas and dissolving the selected target gas in insulating oil.

Meanwhile, when it is determined that the internal pressure of the mixer tank 102 is not equal to or less than the third reference pressure, the controller 500 may drive the fourth pump 204 (S625). That is, the controller 500 determines that the target gas is no longer dissolved, and discharges some of the insulating oil in which the gas is dissolved to the pre-degassing tank 104 to forcibly reduce the internal pressure of the mixer tank 102. there is. As such, the control unit 500 may generate high-concentration standard oil through the mixer tank 102 .

Subsequently, the control unit 500 may determine whether the internal pressure of the mixer tank 102 is equal to or less than a preset fourth reference pressure (S627). For example, the fourth reference pressure may be atmospheric pressure.

When it is determined that the internal pressure of the mixer tank 102 is equal to or less than the fourth reference pressure, the controller 500 may stop driving the fourth pump 204 (S629). That is, the control unit 500 may stop the standard oil stored in the mixer tank 102 from being discharged to the tank 104 before degassing.

Subsequently, the controller 500 may open the first measuring valve 321 connected to the mixer tank 102 for a predetermined time (S631). That is, the controller 500 may supply some of the standard oil stored in the mixer tank 102 to the gas chromatography 403 . Subsequently, the control unit 500 may measure the concentration of each component of the gas dissolved in the standard oil (S633).

8 is a flow chart illustrating a process in which the transformer simulation device adjusts the concentration of gas dissolved in standard oil and supplies it to gas chromatography and a semiconductor gas sensor according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 8 , a process in which the transformer simulation device according to an embodiment of the present invention adjusts the concentration of gas dissolved in standard oil and supplies it to gas chromatography and a semiconductor gas sensor will be described.

First, the controller 500 may drive the third pump 203 (S801). That is, the controller 500 may supply the standard oil stored in the mixer tank 102 to the test tank 103 . At the same time, the controller 500 may open the third discharge valve 303 . That is, the controller 500 may discharge the inert gas filled in the test tank 103 to the outside. Meanwhile, when the standard oil stored in the mixer tank 102 is supplied to the test tank 103, the controller 500 opens the second gas valve 312 to supply inert gas to the mixer tank 102. Step S801 may be performed after step S633.

Subsequently, the control unit 500 may determine whether or not the driving time of the third pump 203 has elapsed a second preset time. (S803)

When it is determined that the driving time of the third pump 203 has passed the second set time, the controller 500 may stop driving the third pump 203 (S805).

Subsequently, the controller 500 may drive the second pump 202 (S807). That is, the controller 500 may supply the pure insulating oil stored in the tank 101 after degassing to the test tank 103 . At this time, the control unit 500 may supply pure insulating oil equal to the volume of the empty space inside the test tank 103 . The supply amount and supply ratio of standard oil and pure insulating oil to be supplied to the test tank 103 may be set in advance, and the control unit 500 may supply standard oil and pure insulating oil to the test tank 103 according to the set supply amount and supply ratio. can Meanwhile, when the pure insulating oil stored in the tank 101 after degassing is supplied to the test tank 103, the controller 500 may open the third gas valve 313 to supply inert gas to the mixer tank 102. .

Subsequently, the control unit 500 may determine whether the internal pressure of the test tank 103 is equal to or higher than a preset fifth reference pressure (S809). The fifth reference pressure may be a threshold value for determining whether filling of the test tank 103 is complete. The control unit 500 may measure the internal pressure of the test tank 103 through the lower and upper pressure gauges 408 and 409 .

When it is determined that the internal pressure of the test tank 103 is equal to or greater than the fifth set pressure, the controller 500 may stop driving the second pump 202 (S811). That is, the control unit 500 may stop the supply of pure insulating oil. At the same time, the controller 500 may close the third discharge valve 303 . That is, the controller 500 may stop discharging the inert gas filled in the test tank 103 . At this time, the concentration of gas dissolved in the standard oil stored in the test tank 103 may be calculated through Equation 1 below. Here, the standard oil concentration may mean the concentration of standard oil measured in step S633.

Subsequently, the control unit 500 may drive the agitator 407 provided in the test tank 103 (S815). That is, the control unit 500 may diffuse the gas dissolved in the standard oil throughout the test tank 103 through the stirrer 407 .

Subsequently, the control unit 500 may determine whether or not the driving time of the agitator 407 has passed a preset third set time (S817). The third set time may be determined by measuring a time for the concentration of the standard oil located at the farthest point from the third pump 203 (ie, the point where the standard oil is introduced) to reach saturation. For this purpose, the second measuring valve 322 is preferably connected to the farthest point from the third pump 203 of the test tank. 9 shows the concentration of gas dissolved in standard oil according to the operating time of the stirrer.

When it is determined that the driving time of the agitator 407 has passed the third set time, the controller 500 may stop driving the agitator 407 (S819).

Subsequently, the controller 500 may open the second measurement valve 322 and the third measurement valve 323 for a predetermined time (S821). That is, the controller 500 may supply some of the standard oil stored in the test tank 103 to the gas chromatography 403 and the semiconductor gas sensor 404 , respectively.

Meanwhile, the controller 500 may heat the test tank 103 through a thermostat included in the test tank 103 while each step is performed. As such, the control unit 500 may simulate heating of the insulating oil during operation of an actual transformer by heating the test tank 130 through a thermostat.

The control unit 500 may repeatedly perform steps S815 to S821 while changing the concentration of gas dissolved in the standard oil. That is, the control unit 500 increases the concentration of the gas dissolved in the standard oil or reduces the concentration of the gas dissolved in the standard oil, and then extracts some of the standard oil to perform the gas chromatography 403 and the semiconductor gas sensor ( 404) can be supplied respectively.

On the other hand, the control unit 500 allows the gas dissolved in the standard oil to spread by diffusion in a state where the stirrer provided in the test tank 103 is not operated, and then the third measuring valve 323 for a predetermined time at regular time intervals. ( 404) can also be tested.

In addition, the control unit 500 instead of changing the concentration of the gas dissolved in the standard oil to perform the test under conditions different from the previous test (ie, a condition in which the type or composition ratio of the gas dissolved in the standard oil is different), the test tank ( 103) can also discharge all of the standard oil stored in it.

10 is a flowchart illustrating a process of increasing the concentration of gas dissolved in standard oil by a transformer simulation device according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 10, a process of increasing the concentration of gas dissolved in standard oil by the transformer simulation device according to an embodiment of the present invention will be described.

First, the controller 500 may drive the fifth pump 205 (S1001). That is, the control unit 500 may discharge the standard oil stored in the test tank 103 to the tank 104 before degassing. At the same time, the controller 500 may open the third gas valve 313 for a set time. That is, the controller 500 may supply the inert gas to the test tank 103 . Step S1001 may be performed after step S821.

Subsequently, the control unit 500 may determine whether or not the driving time of the fifth pump 205 has passed a fourth preset time (S1003). The fourth set time may be determined according to the target concentration. That is, the control unit 500 may calculate a set time for increasing the concentration of gas dissolved in the standard oil to a set target concentration, and drive the fifth pump 205 for the calculated set time.

When it is determined that the driving time of the fifth pump 205 has passed the fourth set time, the controller 500 may stop driving the fifth pump 205 (S1005). At the same time, the controller 500 may close the third gas valve 313 .

Subsequently, the controller 500 may drive the third pump 203 (S1007). That is, the controller 500 may supply the standard oil stored in the mixer tank 102 to the test tank 103 . At the same time, the controller 500 may open the third discharge valve 303 for a set time. That is, the controller 500 may discharge the inert gas filled in the test tank 103 .

Subsequently, the control unit 500 may determine whether or not the driving time of the third pump 203 has passed a previously set fifth set time (S1009). The control unit 500 calculates a set time for supplying the standard oil stored in the mixer tank 102 to the test tank 103 as much as the volume of the standard oil discharged from the test tank 103, and the third pump during the calculated set time (203) can be driven.

When it is determined that the driving time of the third pump 203 has passed the fifth set time, the controller 500 may stop driving the third pump 203 (S1011). At the same time, the controller 500 may close the third discharge valve 303 . At this time, the concentration of the gas dissolved in the standard oil can be calculated through Equation 2 below. Here, the high-concentration insulating oil may mean standard oil stored in the mixer tank 102, and the existing standard oil may mean standard oil before changing the concentration.

No matter how good the airtight design of the mixer tank 102 is, a very small amount of gas may leak. In preparation for this possibility of gas leakage, the concentration of gas dissolved in the standard oil stored in the mixer tank 102 is remeasured immediately before supplying the standard oil to the test tank 103, and the measured value is measured as the standard stored in the test tank 103. The accuracy of the calculation can be improved by using it to calculate the concentration of gas dissolved in oil.

As described above, the control unit 500 discharges some of the standard oil stored in the test tank 103 and supplies the standard oil stored in the relatively high concentration mixer tank 102 to the test tank 103 to test the test tank 103. ) can increase the concentration of gases dissolved in standard oil stored in

11 is a flowchart illustrating a process of reducing the concentration of gas dissolved in standard oil by a transformer simulation device according to an embodiment of the present invention.

Hereinafter, referring to FIG. 11, a process of reducing the concentration of gas dissolved in standard oil by the transformer simulation device according to an embodiment of the present invention will be described.

First, the controller 500 may drive the fifth pump 205 (S1101). That is, the control unit 500 may discharge the standard oil stored in the test tank 103 to the tank 104 before degassing. At the same time, the controller 500 may open the third gas valve 313 for a set time. That is, the controller 500 may supply the inert gas to the test tank 103 . Step S1101 may be performed after step S821.

Subsequently, the control unit 500 may determine whether or not the driving time of the fifth pump 205 has passed a fourth preset time (S1103). It can be determined according to the target concentration. That is, the control unit 500 may calculate a set time for increasing the concentration of gas dissolved in the standard oil to a set target concentration, and drive the fifth pump 205 for the calculated set time.

When it is determined that the driving time of the fifth pump 205 has passed the fourth set time, the controller 500 may stop driving the fifth pump 205 (S1105). At the same time, the controller 500 may close the third gas valve 313 .

Subsequently, the controller 500 may drive the second pump 202 (S1107). That is, the controller 500 may supply the pure insulating oil stored in the tank 101 after degassing to the test tank 103 . At the same time, the controller 500 may open the third discharge valve 303 for a set time. That is, the controller 500 may discharge the inert gas filled in the test tank 103 .

Subsequently, the control unit 500 may determine whether or not the driving time of the second pump 202 has passed a preset sixth set time (S1109). The control unit 500 calculates a set time for supplying the pure insulating oil stored in the degassed tank 101 to the test tank 103 by the volume of the standard oil discharged from the test tank 103, and during the calculated set time, the second The pump 202 can be driven.

When it is determined that the driving time of the second pump 202 has passed the sixth set time, the controller 500 may stop driving the second pump 202 (S1111). At the same time, the controller 500 may close the third discharge valve 303 . At this time, the concentration of the gas dissolved in the standard oil can be calculated through Equation 3 below.

As described above, the control unit 500 partially discharges the standard oil stored in the test tank 103 and supplies pure insulating oil stored in the relatively low-concentration degassed tank 101 to the test tank 103 to test the tank ( 103) can reduce the concentration of gas dissolved in the standard oil.

12 is a flowchart illustrating a process of degassing standard oil stored in a test tank by a transformer simulation device according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 12 , a process of degassing the standard oil stored in the test tank 103 by the transformer simulation device according to an embodiment of the present invention will be described.

First, the controller 500 may drive the fifth pump 205 (S1201). That is, the controller 500 may discharge the standard oil stored in the test tank 103 to the tank 104 before degassing. At the same time, the controller 500 may open a gas valve connected to the test tank 103 . That is, the controller 500 may supply inert gas to the test tank 103 . Step S1201 may be performed after step S821.

Subsequently, the control unit 500 may determine whether the internal pressure of the test tank 103 is equal to or less than a preset sixth reference pressure (S1203). The sixth reference pressure may be a threshold value for determining whether all of the standard oil stored in the test tank 103 has been discharged.

When it is determined that the internal pressure of the test tank 103 is equal to or less than the sixth reference pressure, the controller 500 may stop driving the fifth pump 205 (S1205).

Meanwhile, the controller 500 drives the second pump 202 to supply pure insulating oil to the test tank 103, and drives the fifth pump 205 to discharge pure insulating oil stored in the test tank 103. By repeating the process, the standard oil remaining in the test tank 103 may be completely removed.

Subsequently, the control unit 500 removes gas dissolved in the standard oil stored in the pre-degassing tank 104 through the degassing device 105 to generate pure insulating oil (S1207), and removes the generated pure insulating oil from the tank 101 after degassing. It can be stored in (S1209).

Meanwhile, since the standard oil temporarily stored in the pre-degassing tank 104 is insulating oil to be deaerated later, application of an inert gas is unnecessary.

13 is a flowchart illustrating a process of matching the concentration of standard oil and the electrical resistance value of a semiconductor gas sensor by the transformer simulating device according to an embodiment of the present invention and storing them in a database.

Hereinafter, with reference to FIG. 13, a process of matching the concentration of standard oil and the electrical resistance value of the semiconductor gas sensor by the transformer simulation device according to an embodiment of the present invention and storing them in a database will be described.

First, the control unit 500 may measure the concentration of each component of the gas dissolved in the standard oil through the gas chromatography 403 (S1301). Step S1301 may be performed after step S821.

Subsequently, the control unit 500 may measure the electrical resistance value for each component of the gas dissolved in the standard oil through the semiconductor gas sensor 404 (S1303).

Subsequently, the control unit 500 determines the concentration of gas dissolved in the standard oil by component measured through the gas chromatography 403 and the electrical resistance value by component of the gas dissolved in the standard oil measured through the semiconductor gas sensor 404. can be matched and stored in the database. (S1305)

The physical properties measured by the semiconductor gas sensor 404 may be an electrical resistance value according to the concentration of the gas, not the concentration of the gas dissolved in the standard oil. Therefore, in order to measure the concentration of gas dissolved in the standard oil through the physical properties measured by the semiconductor gas sensor 404, it is necessary to build a database of gas concentrations corresponding to the physical properties. The present invention can build a database for electrical resistance value-gas concentration by matching and storing the electrical resistance value measured through the semiconductor gas sensor and the concentration of gas dissolved in the standard oil measured through gas chromatography. The built database may be used for calibration of the semiconductor gas sensor or performance evaluation of the semiconductor gas sensor.

The control unit 500 may derive a relational expression for converting the electrical resistance value measured through the semiconductor gas sensor 404 into a gas concentration by referring to the database.

As described above, the transformer simulation device and method of operating the same according to an embodiment of the present invention simulates the phenomenon in which gas generated inside the transformer is dissolved in insulating oil according to the internal abnormality of the transformer, so that the internal abnormality of the transformer causes Gas-dissolved insulating oil can be produced effectively and reproducibly. In addition, the present invention measures the concentration of gas dissolved in insulating oil through gas chromatography, measures the electrical resistance value according to the gas dissolved in insulating oil through a semiconductor gas sensor, and measures the concentration and electrical resistance value of the gas. By matching and storing , a database for electrical resistance value-gas concentration can be constructed. In addition, the present invention can repeatedly use the once injected insulating oil by removing gas and moisture dissolved in the insulating oil used in the test through a purifier.

Implementations described herein may be embodied in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Even if discussed only in the context of a single form of implementation (eg, discussed only as a method), the implementation of features discussed may also be implemented in other forms (eg, an apparatus or program). The device may be implemented in suitable hardware, software and firmware. The method may be implemented in an apparatus such as a processor, which is generally referred to as a processing device including, for example, a computer, microprocessor, integrated circuit or programmable logic device or the like. Processors also include communication devices such as computers, cell phones, personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

Although the present invention has been described with reference to the embodiments shown in the drawings, it should be noted that this is only exemplary and various modifications and equivalent other embodiments are possible from those skilled in the art to which the technology pertains. will understand Therefore, the true technical protection scope of the present invention should be defined by the claims below.

101: degassing tank
102: mixer tank
103: test tank
104: tank before degassing
105: degassing device
201 to 205: first to fifth pumps
301 to 304: first to fourth discharge valves
311 to 314: first to fourth gas valves
321 to 323: first to third measuring valves
401: inert gas cylinder
402: mass flow controller
403: gas chromatography
404: semiconductor gas sensor
500: control unit

Claims (19)

a degassing tank for storing pure insulating oil;
a mixer tank for generating standard oil by dissolving gases to be injected in the pure insulating oil supplied from the degassing tank; and
A test tank for mixing standard oil supplied from the mixer tank and pure insulating oil supplied from the degassing tank, extracting a part of the mixed standard oil, and supplying it to gas chromatography and a semiconductor gas sensor. Transformer simulation device, characterized in that.
According to claim 1,
The mixer tank and the test tank,
A transformer simulation device comprising a stirrer for dissolving or mixing liquid or gas.
According to claim 1,
The test tank,
A transformer simulation device comprising: a thermostat for heating the inside of the test tank to simulate heating of the insulating oil during actual operation of the transformer.
According to claim 1,
The transformer simulation device further comprising a mass flow controller supplying the gas to be injected into the mixer tank.
According to claim 1,
a first measuring valve connected to the mixer tank and regulating supply of the standard oil stored in the mixer tank to the gas chromatography; and
The transformer simulation device further comprising a second measuring valve connected to the test tank and regulating supply of the standard oil stored in the test tank to the gas chromatography.
According to claim 1,
The transformer simulation device further comprising a; third measuring valve connected to the test tank and regulating supply of the standard oil stored in the test tank to the semiconductor gas sensor.
According to claim 1,
a pre-degassing tank for storing the standard oil discharged from the test tank; and
and a degassing device for generating pure insulating oil by removing gas dissolved in the standard oil stored in the pre-degassing tank and storing the generated pure insulating oil in the post-deaeration tank.
According to claim 7,
a first pump supplying the pure insulating oil stored in the tank after degassing to the mixer tank;
a second pump supplying the pure insulating oil stored in the tank after degassing to the test tank;
a third pump supplying the standard oil stored in the mixer tank to the test tank;
a fourth pump supplying standard oil stored in the mixer tank to the tank before degassing; and
The transformer simulation device further comprising a fifth pump for supplying the standard oil stored in the test tank to the pre-degassing tank.
According to claim 7,
A transformer simulation device comprising: a discharge valve connected to each tank and regulating discharge of the inert gas filled in each tank.
According to claim 7,
an inert gas cylinder in which inert gas is stored; and
The transformer simulation device further comprising a gas valve connected to each tank and regulating supply of the inert gas stored in the inert gas cylinder to each tank.
According to claim 1,
The concentration of each component of the gas dissolved in the standard oil is measured through the gas chromatography, the electrical resistance value of each component of the gas dissolved in the standard oil is measured through the semiconductor gas sensor, and the measured concentration and The transformer simulation device further comprising a server that matches the electric resistance value for each component and stores it in a database.
(a) supplying the pure insulating oil stored in the tank after degassing to the mixer tank;
(b) generating standard oil by dissolving the gas to be injected into the pure insulating oil stored in the mixer tank;
(c) supplying the standard oil stored in the mixer tank and the pure insulating oil stored in the degassed tank to a test tank;
(d) mixing the standard oil and the pure insulating oil; and
and (e) extracting some of the mixed standard oil and supplying it to gas chromatography and a semiconductor gas sensor.
According to claim 12,
In step (b),
(b-1) selecting one of the injection target gases as a target gas;
(b-2) injecting a target gas into a mixer tank through a mass flow controller corresponding to the selected target gas; and
Including; (b-3) step of dissolving the target gas in the pure insulating oil,
In step (b),
The method of operating a transformer simulation device, characterized in that repeating the steps (b-1) to (b-3) until all of the injection target gases are injected.
According to claim 13,
In the step (b-3),
pressurizing the mixer tank; and
and operating an agitator provided in the mixer tank so that the target gas is dissolved in the pure insulating oil.
According to claim 12,
In step (d),
heating the test tank through a thermostat; and
A method of operating a transformer simulation device comprising the step of operating an agitator provided in the test tank.
According to claim 12,
After step (e),
A method of operating a transformer simulation device, characterized in that the steps (d) and (e) are repeatedly performed while changing the concentration of gas dissolved in the standard oil stored in the test tank.
According to claim 12,
After step (e),
(f) discharging the standard oil stored in the test tank to a tank before degassing;
(g) generating pure insulating oil by removing gases dissolved in the standard oil stored in the pre-degassing tank through a degassing device; and
and (h) storing the generated pure insulating oil in the tank after degassing.
According to claim 12,
After step (e),
(i) measuring the concentration of each component of the gas dissolved in the standard oil through the gas chromatography;
(j) measuring the electrical resistance value for each component of the gas dissolved in the standard oil through the semiconductor gas sensor; and
and (k) matching the measured concentration of each component with the electrical resistance value of each component and storing it in a database.
According to claim 12,
Steps (a) and (c) are
When draining each tank, supplying an inert gas of the same volume as the volume of insulating oil discharged from each tank to the tank from which the insulating oil is discharged, so as to prevent negative pressure from being generated inside each tank. How to operate a transformer simulation device with

Images