KR101290295B1 - Fault diagnosis method of oil filled transformer using proportion ratio combination of dissolved gases - Google Patents

Abstract

The present invention relates to a method for accurately diagnosing the internal defect of the inlet transformer by analyzing the content ratio of the oil in the gas generated during the internal defect of the inlet transformer.
In the internal fault diagnosis method of the inlet transformer according to the present invention, in the internal fault diagnosis method of the inlet transformer for diagnosing the internal fault by analyzing the gas in the oil contained in the insulating oil of the diagnostic inlet transformer to diagnose the internal fault, the oil in the gas A first step of extracting H 2, CH 4, C 2 H 2, C 2 H 4 and C 2 H 6; A second step of selecting four oil gases classified by internal defects among the five oil gases extracted and calculating a value of the content percentage (%) of each of the oil gases among the total content of the selected four oil gases; ; And one to four selected from the combinations of% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2,% C2H4 and% CH4,% H2 and% C2H6,% C2H4 and% C2H6 And a third step of determining an internal defect of the diagnostic inflow transformer using the combination.

Description

Method of diagnosing internal defects of inflow transformer through combination of oil and gas content ratio {FAULT DIAGNOSIS METHOD OF OIL FILLED TRANSFORMER USING PROPORTION RATIO COMBINATION OF DISSOLVED GASES}

The present invention relates to a method for diagnosing an internal defect of an inlet transformer, and more particularly, to a method for accurately diagnosing an internal defect of an inlet transformer by analyzing a content ratio of gas in water generated during an internal defect of the inlet transformer.

Inlet transformers installed in substations or utilities are one of the main facilities of the power supply system and require high reliability. These inflow transformers may suffer from deterioration of electrical and mechanical performance due to deterioration during operation, which can lead to serious accidents if these phenomena are not detected in advance and proper measures are taken.

Abnormal phenomena such as insulation breakdown and local overheating in the inlet transformer are accompanied by heat generation. Happens. Most of these gases are dissolved in insulating oil. Therefore, it is possible to diagnose the type and extent of the defects generated by extracting and analyzing the gas by collecting the insulating oil of the inlet transformer.

The diagnosis method of the inlet transformer using the analysis of the oil in the gas requires very complicated procedures and efforts, but is widely used all over the world because the hit ratio is high due to the defect diagnosis inside the inlet transformer.

Types of internal defects of oil inlet transformers and methods of diagnosis by oil in gas are described in the International Standard (IEC 60599: Mineral oil-impregnated electrical equipment in Service Guide to the interpretation of dissolved and free gases analysis and IEEE C57.104: IEEE Guide for the Interpretation). of Gases in Oil-Immersed Transformer, and most utility companies and users of incoming power equipment assume internal defects in accordance with this international standard.

The types of faults specified in these international standards are classified into electrical faults (E) and thermal faults (T), which are classified into partial discharges (PD) and low energy discharges (D1). low energy), D2 (Discharges of high energy), first thermal fault t <300 ° C (Trmal fault t <300 ° C) (T1), second thermal fault 300 ° C <t <700 ° C (Thermal fault Six defects are defined as 300 ° C. <t <700 ° C.) (T2) and a third thermal defect t> 700 ° C. (Thermal fault 700 ° C.) (T3). In addition, the gas to be analyzed in these international standards includes five components: hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), and acetylen (C2H2). to be.

Conventionally, the types of defects are classified by selecting the composition ratio of the five gas components, the ratio of gas content (%), the range by the key gas, and the like. However, the conventional inlet transformer internal fault diagnosis method has the following problems.

First, the diagnosis method based on key gas diagnoses a defect using only the main gas (maximum gas value), so that the pattern, composition, and amount of change of gas according to the energy of each defect cannot be reflected. This is high. For example, there is a problem that the non-diagnostic area exists when a gas other than the main gas has a maximum value.

In addition, the diagnosis method based on the composition ratio (ratio) using the gas of five components is derived from the diagnosis result reflecting the pattern, composition and amount of change of the gas, so that the accuracy of the diagnosis is high, but the type of defect and the gas ratio for each defect are out of range. Diagnosis is impossible.

In addition, the diagnostic method based on the gas content ratio (%) has no undiagnosable area and uses only three gas components with high accuracy but high energy of defects. There is a problem that it is difficult to diagnose the initial failure is not reflected.

Therefore, there has been a demand in the art to improve the reliability of the internal fault diagnosis of the inlet transformer and to develop the internal fault diagnosis technology of the inlet transformer capable of diagnosing all the defective areas.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and has two oil-in-oil content ratios among four oil-in-oil ratios (%) selected from five oil-in-oil gas generated during internal defects of the inlet transformer. It is an object of the present invention to provide a method for diagnosing internal defects of an inlet transformer through a combination of oil and gas content ratios for accurately diagnosing an internal defect of a corresponding inlet transformer using a combination.

Inlet transformer internal fault diagnosis method through the combination of the water-in-oil content ratio of the present invention for achieving the above object, the inlet transformer for diagnosing the internal fault by analyzing the gas in the oil contained in the insulating oil of the diagnostic inlet transformer to diagnose the internal fault In the method of diagnosing the internal defects of the internal defects, the various types of internal defects are known in advance, such as% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2,% C2H4 and% CH4,% H2 and% C2H6, In each of the combinations of% C2H4 and% C2H6, one or more combinations of internal defects may be set in advance on the XY plane for each combination by using the x, y coordinates and the XY planes using the set x, y coordinates. A first step of dividing an area by the type of the internal defects; A second step of extracting H 2, CH 4, C 2 H 2, C 2 H 4 and C 2 H 6 in the oil-in-gas; A third step of selecting four oil gases classified by internal defects among the five oil gases extracted and calculating a content ratio (%) of each of the oil gases in the total content of the selected four oil gases; And each combination of the calculated% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2,% C2H4 and% CH4,% H2 and% C2H6,% C2H4 and% C2H6 And a fourth step of determining the type of the internal defect of the diagnostic inflow transformer corresponding to the region by the type of the internal defect.

In an embodiment of the present invention, the first step, the partial discharge (PD), low energy discharge (D1), high energy discharge (D2), the first thermal defect (t < 300 ° C) (T1), the second thermal defects (300 ° C <t <700 ° C) (T2) and the third thermal defects (t> 700 ° C) (T3), respectively. presetting on the first XY plane by using y coordinates; And a partial discharge PD region, a low energy discharge D1 defect region, a high energy discharge D2 defect region, and a first thermal defect t <5 using the set plurality of coordinates. 300 ° C.) (T1) region, a second thermal defect (300 ° C. <t <700 ° C.) (T2) region, and a third thermal defect (t> 700 ° C.) (T3) region; And the fourth step determines an internal defect of the diagnostic inflow transformer using a region corresponding to the x, y coordinates for the% H2 and% CH4 values calculated in the third step.

In an embodiment of the present disclosure, the first step may include thermal defects, partial discharges (PDs), low energy discharges (D1), and high energy discharges (D2) of each of the inflow transformers having known types of internal defects. Presetting the ratio% H2 and% C2H4 values on the second XY plane with x, y coordinates, respectively; And a half region of the second XY plane is a thermal defect region, a partial discharge (PD) defect region, a low energy discharge (D1) defect region, and a high energy discharge (D2) defect region of the second XY plane using the set plurality of coordinates. Distinguishing; And the fourth step determines the internal defect of the diagnostic inflow transformer using a region corresponding to the x, y coordinates for the% H2 and% C2H4 values calculated in the third step.

In an embodiment of the present invention, the first step, the partial discharge (PD), low energy discharge (D1), high energy discharge (D2), the first and second thermal defects for each of a plurality of inlet transformers of known types of internal defects (t <300 ° C, 300 ° C <t <700 ° C) (T1, T2) and the third XY using the ratios% C2H4 and% C2H2 represented by the third thermal defect (t> 700 ° C) as x and y coordinates, respectively. Presetting on a plane; The half region of the third XY plane is divided into a partial discharge (PD) defect region, a low energy discharge (D1) defect region, a high energy discharge (D2) defect region, and first and second thermal defects using the set plurality of coordinates. dividing into a t <300 ° C, 300 ° C <t <700 ° C) (T1, T2) region, and a third thermal defect (t> 700 ° C) (T3) region; And the fourth step determines an internal defect of the diagnostic inflow transformer using an area corresponding to the x, y coordinates for the% C2H4 and% C2H2 values calculated in the third step.

In an embodiment of the present invention, the first step, the partial discharge (PD), low energy discharge (D1), high energy discharge (D2), the first thermal defect (t < 300 ° C) (T1), the second thermal defects (300 ° C <t <700 ° C) (T2), and the percentages% C2H4 and% CH4 values represented by the third thermal defects (t> 700 ° C), respectively, in x and y coordinates. Presetting on a fourth XY plane; The half region of the fourth XY plane is divided into a partial discharge (PD) defect region, a low energy discharge (D1) defect region, a high energy discharge (D2) defect region, and a first thermal defect (t <300) using the set plurality of coordinates. (C) (T1), the second thermal defect (300 ℃ <t <700 ℃) (T2) region, and the third thermal defect (t> 700 ℃) (T3) region; And the fourth step determines the internal defect of the diagnostic inflow transformer using a region corresponding to the x, y coordinates for the% C2H4 and% CH4 values calculated in the third step.

In an embodiment of the present invention, the XY axis of the first to fourth XY plane is the value of% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2, and% C2H4 and% CH4, respectively, 0 to 100 The defect area is in the range of% and is located in a triangular shape formed by connecting each other in a straight line between the points where the XY axis of each XY plane is 100%.

In an embodiment of the present invention, the content ratio value of each of the oil in gas calculated in the third step is all included in the defect region of the triangular shape.

In addition, the method for diagnosing internal defects of the inflow transformer through the combination of the oil and gas content ratios of the present invention includes: a first step of extracting the gaseous gas of H2, CH4, C2H2, C2H4, and C2H6 for each of a plurality of inflow transformers whose types of internal defects are known; A second step of calculating the content ratios of the respective oil in gas content percentages% H2,% CH4,% C2H4,% C2H2 and% C2H6 of the total amount of oil in gas extracted for each of the plurality of inlet transformers; Half of the first XY plane using the plurality of first x, y coordinates is set in advance on the first XY plane by using the ratios% H2 and% CH4 values represented by the internal defects as first x, y coordinates, respectively. Dividing a region into each of the internal defect regions; Half of the second XY plane using the plurality of second x, y coordinates is set in advance on a second XY plane by setting ratios% H2 and% C2H4 values for each internal defect as second x, y coordinates, respectively. Dividing a region into each of the internal defect regions; Half of the third XY plane using the plurality of third x, y coordinates is set in advance on the third XY plane using the ratios% C2H4 and% C2H2 values represented by the internal defects as the third x, y coordinates, respectively. A fifth step of dividing an area into each of the internal defect areas; The ratios% C2H4 and% CH4 represented by the internal defects are set in advance on the fourth XY plane using the fourth x, y coordinates, respectively, and the half of the fourth XY plane using the plurality of fourth x, y coordinates. Dividing a region into each of the internal defect regions; Oil-in-oil H2, CH4, C2H2 and C2H4 are extracted from the insulating oil of the diagnostic inlet transformer for diagnosing internal defects, and the content ratios of the respective oil in the total oil content of the four oil gases extracted from the diagnostic inlet transformer are% H2 and% CH4. A seventh step of calculating the% C2H4 and% C2H2 values, respectively; And at least one selected from among% H2 and% CH4 values,% H2 and% C2H2 values,% C2H4 and% C2H2 values, and% C2H4 and% CH4 values among the content ratios of the oil in gas calculated in step 7. Including the eighth step of determining the internal defect of the diagnostic inlet transformer.

According to the present invention, the rate of erroneous diagnosis of internal defects of the inlet transformer can be reduced.

In addition, according to the present invention can not improve the reliability of the diagnosis of the internal defect is not generated when the diagnosis impossible region when the internal defect of the inlet transformer.

1 is a block diagram of the internal fault diagnosis apparatus of the inlet transformer to which the present invention is applied.
2a to 2d are first to fourth XY plan views according to the present invention;
3 is a flowchart illustrating a process of setting first to fourth XY plan views according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer through a combination of oil and gas content ratios according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a block diagram of an internal fault diagnosis apparatus of an inlet transformer to which the present invention is applied.

Referring to FIG. 1, in the present embodiment, the internal defect diagnosis apparatus 10 of the inflow transformer includes a water gas detection sensor 11, a water gas content ratio calculation unit 12, a database (DB) 13, and a controller 14. It is configured to include).

The oil in gas detection sensor 11 detects oil in gas contained in the insulating oil in the inlet transformer 1. The oil-in-gas detection sensor 11 is composed of an extraction unit for extracting the oil in gas dissolved in the insulating oil of the inlet transformer 1 and a detection unit for determining the size value of the extracted oil in gas. In the present embodiment, the oil in gas detection sensor 11 extracts hydrogen (H 2), methane (CH 4), acetylene (C 2 H 2), ethylene (C 2 H 4), and ethane (C 2 H 6) from among a plurality of oil gases. . Among these five oil gases, CH4 and C2H6 are classified as low temperature defects, C2H4 is classified as high temperature defects, H2 is classified as low energy discharge, and C2H2 is classified as high energy discharge.

The oil-in-oil content ratio calculation unit 12 selects four oil-in-oil gas classified by internal defects among the five oil-in-oil gas detected by the oil-in-oil gas detection sensor 11, and calculates the content ratio (%) of the four oil-in-oil gas. Calculate each. Hereinafter, for convenience of description, a case in which four oil gases of H 2, CH 4, C 2 H 2, and C 2 H 4 are selected among the five oil gases will be described. However, the present invention is not limited to this, and four other oil in gas may be selected. In this example, the proportion of each of the selected four oil-in-gases to each oil-in-oil gas, i.e.,% H2,% CH4,% C2H2 and% C2H4, is calculated, respectively. Here, the content ratio of each of the oil in the gas is a value representing the percentage of each of the oil in gas when the total content of the oil in gas of these four components to 100%. Therefore, each of these oil in gas content ratio is calculated as in Equation 1 below.

Of course, even if four other oil-in-oil gas among the above five oil-in-oil gas is selected, the content ratio of each oil-in-oil gas to the total content of the four selected oil-in-oil gas is calculated as above.

The database (DB) 13 stores data that is reference information for determining an internal defect of the inflow transformer 1. Specifically, for this purpose, in the present embodiment, the database (DB) 13 uses the X-axis and Y-axis values of the first XY plane,% H2, and% C2H2, respectively, in which the% H2 and% CH4 values are the X and Y axes, respectively. 3rd XY top view made of the axes, the 3rd XY top view made of the% C2H4, and% C2H2 values to the X and Y axes, respectively, and 4th XY top view made the X and Y axes of the% C2H4 and% CH4 values, respectively And various data related to these plan views. For example, the defect area is classified according to the type of internal defect. At this time, these four plan views are for determining the type of internal defects using the values of% H2,% CH4,% C2H2 and% C2H4 detected by the diagnostic inflow transformer 1 to determine the internal defects.

In addition, the four plan views show% H2,% CH4,% C2H2 and% C2H4 for each of the inlet transformers of which the type of internal defects are known, and then% H2-% CH4 value,% H2-% C2H2 value,% The C2H4-% C2H2 value and the% C2H4-% CH4 value are set in advance on the first to fourth XY planes by using x and y coordinates, respectively. It is to separate the areas.

The control unit 14 includes the% H2 and% CH4 values, the% H2 and% C2H2 values, the% C2H4 and% C2H2 values, and the% C2H4 and% CH4 values calculated for the diagnostic inflow transformer 1 to determine the internal defect. The internal defect of the corresponding diagnostic inflow transformer 1 is determined using one or more selected values. Specifically, the control unit 14 of the present embodiment is the content of the oil in gas detected by the diagnostic inlet transformer 1% H2-% CH4 value,% H2-% C2H2 value,% C2H4-% C2H2 value,% C2H4-% CH4 Using the values as x and y coordinates, it is determined to determine which defect area in each of the first to fourth XY planes corresponding to each of the x and y coordinates is stored in the database (DB) 13 to finally determine the corresponding internal defect. do.

Here, the inflow transformer is known in the internal fault is an inflow transformer in which the failure (internal defect) occurred in the inlet transformer used in the actual site, the content ratio of the oil in the gas corresponding to the internal defect in the internal fault occurs It is used for verification to verify the correlation between each other by matching. In contrast, a diagnostic inflow transformer is an inflow transformer for diagnosing an internal defect using the XY plan view.

2A to 2D are first to fourth X-Y top views according to the present invention.

2A to 2D are X-axis and Y-axis for% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2, and% C2H4 and% CH4, respectively, for a plurality of inlet transformers with known types of internal defects. The internal defects according to the content ratio of the oil in the gas are shown in the first to fourth XY plan views. In the present embodiment, for example, the content ratio of the respective oil-in-oil gas to the contents of the accident (internal defects) is analyzed for a plurality of inflow transformers (known as internal defects) in which internal defects occur during actual operation. .

Specifically, in FIG. 2A,% H2 and% CH4 are the X and Y axes, respectively, and the range is set to 0 to 100%, respectively. For example, reference numeral A denotes a case where% H2 is 33% and% CH4 is 56% of a specific inlet transformer. As such, when% H2-% CH4 for each of the 93 inlet transformers is represented, the first X-Y plan view of FIG. 2A is shown. In addition, the defect area is determined by dividing the values shown in the first X-Y plan view of FIG. 2A by the type of the internal defect. In this case, the types of internal defects include partial discharge (PD), low energy discharge (D1), high energy discharge (D2), first thermal defect t <300 ° C (T1), and second thermal defect 300 ° C. <t <700 ° C (T2) and the third thermal defect t> 700 ° C (T3).

As in FIG. 2A, in FIG. 2B,% H2 and% C2H2, FIG. 2C shows% C2H4 and% C2H2, and FIG. 2D shows% C2H4 and% CH4 as X and Y axes, respectively. Set to%. Also, in FIG. 2B to FIG. 2D, the defect area is determined by classifying the type of internal defect from the values shown in the second to fourth X-Y plan views.

First, in the second X-Y plan view of FIG. 2B, the partial discharge PD, the low energy discharge D1, and the high energy discharge D2 of the thermal defect T and the electrical defect E are determined.

In addition, in the third XY plan view of FIG. 2C, the first and second thermal defects T1 & T2, the third thermal defect T3 of the thermal defect T, the partial discharge PD of the electrical defect E, and the low energy discharge (D1), the high energy discharge (D2), and the common area of thermal defect (T) and electrical defect (E) are determined.

In addition, in the fourth XY plan view of FIG. 2D, the first thermal defect T1, the second thermal defect T2, the third thermal defect T3, the partial discharge PD, the low energy discharge D1, and the high energy discharge ( D2) is determined.

As shown in Figs. 2A to 2D, the XY axes of the first to fourth XY plan views have% H2-% CH4 value,% H2-% C2H2 value,% C2H4-% C2H2 value, and% C2H4-% CH4 value, respectively. Each defect area is in the range of 0 to 100%, and each defect area is located in a triangular shape formed by connecting straight lines to each other where the XY axis of each XY plane is 100%.

3 is a flowchart illustrating a process of setting a 1-4 X-Y plan view according to the present invention.

Referring to FIG. 3, the oil in the oil contained in the insulating oil is detected for each of a plurality of inlet transformers in which the type of internal defects is known (S101). H2, CH4, C2H2 and C2H4 are extracted from the detected oil in gas and the amount thereof is measured (S103). Calculate the total content of the oil in gas of the extracted four components, and calculates the content ratio% H2,% CH4,% C2H4 and% C2H2 value of each of the oil in the total content (S105). Thereafter, the first to fourth X-Y plan views are set using the plurality of% H 2,% CH 4,% C 2 H 4 and% C 2 H 2 values calculated as described above.

First, the process of setting the first X-Y plan view will be described. The content ratio% H2 and% CH4 values for each of the inflow transformers of which the types of internal defects are already known are set in advance on the first XY plane by using the first x and y coordinates (S107), A half region of the first XY plane is divided into respective internal defect regions by using the set first x, y coordinates (S109).

Subsequently, the content ratio% H2 and% C2H2 values, which are represented by the types of internal defects, are set in advance on the second XY plane using the second x and y coordinates (S111), respectively, and the plurality of second x, y coordinates are set. The half region of the second XY plane is divided into respective internal defect regions (S113).

In addition, the content ratio% C2H4 and% C2H2 values appearing according to the types of internal defects are set in advance on the third XY plane using the third x, y coordinates (S115), and the plurality of set third x, y coordinates are set. The half region of the third XY plane is divided into respective internal defect regions by using S117.

Subsequently, the content ratio% C2H4 and% CH4 values appearing according to the types of internal defects are set in advance on the fourth XY plane using the fourth x, y coordinates (S119), respectively, and the plurality of set fourth x, y coordinates. A half region of the fourth XY plane is divided into respective internal defect regions by using S121.

As described above, the first to fourth planar views obtain content ratios of four oil in gas extracted from a plurality of inlet transformers whose internal defects are known in advance, and XY by using two selected content ratio values as x, y coordinates. It is set on the plane to distinguish each defect area. These first to fourth plan views are then used to determine the internal defect of the diagnostic inlet transformer for diagnosing the internal defect.

4 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer through a combination of oil and gas content ratios according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in the inflow transformer internal defect diagnosis method of the present invention, first, the oil in gas is detected by the inflow transformer 1 for diagnosis to diagnose the internal defect (S201). H2, CH4, C2H2, C2H4 and C2H6 are extracted from the oil-in-oil gas thus detected and the amount thereof is measured (S203). Select the four oil gases classified by internal defects among the five oil components extracted, calculate the total content of the selected four oil gases, and the content ratio of each oil gas in the calculated total contents (% Calculate That is, in one example of the present invention, the values of% H2,% CH4,% C2H4 and% C2H2 are respectively calculated (S205). However, the present invention is not limited thereto, and four other oil in gas may be selected. Thereafter, the internal defect of the corresponding diagnostic inflow transformer 1 is determined by using at least one selected from the calculated values of% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2, and% C2H4 and% CH4. It is determined (S207). Here, in the internal defect determination step of S207, a region corresponding to the values of% H2 and% CH4 is determined in the defect region divided on the first XY plan view, and the internal defect is accurately determined using the determined defect region. Similarly, the regions corresponding to the values of% H2 and% C2H2 are determined in the defect regions divided in the second XY plan view, and the regions corresponding to the values of% C2H4 and% C2H2 are defects divided in the third XY plan view. The area is determined in the area, and the area corresponding to the values of% C2H4 and% CH4 is determined in the defect area divided in the fourth XY plan view. In this case, the internal defect determination using the first to fourth XY planes may be performed in parallel. Therefore, internal defects may be determined using at least one XY plan view selected from the first to fourth XY plan views.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the appended claims, The genius will be so self-evident. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Inflow transformer plays an important role in power supply system as a power equipment that boosts or depresses the supplied voltage. If an internal fault occurs in the inflow transformer, it is important to prevent the accident by detecting it in advance.

In view of this aspect, the present invention can accurately diagnose internal defects by collecting and analyzing the oil in the oil contained in the insulating oil in the inlet transformer, so that it is very useful for not only the inlet transformer manufacturing but also substations and power companies that apply it in the field. Can be.

1: Inlet transformer 10: Internal fault diagnosis device
11: oil in gas detection sensor 12: oil in gas content ratio calculation unit
13: database (DB) 14: control unit

Claims (8)

In the internal fault diagnosis method of the inlet transformer for diagnosing the internal defect by analyzing the gas in the oil of the insulating oil of the diagnostic inlet transformer to diagnose the internal defect,
For each inlet transformer with a known type of internal defect, the combination of% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2,% C2H4 and% CH4,% H2 and% C2H6,% C2H4 and% C2H6 Preset on the XY plane for each combination by the value appearing by the type of internal defect in one or more combinations as x, y coordinates and area each XY plane by the type of the internal defect using the set x, y coordinates A first step of classifying;
A second step of extracting H 2, CH 4, C 2 H 2, C 2 H 4 and C 2 H 6 in the oil-in-gas;
A third step of selecting four oil gases classified by internal defects among the five oil gases extracted and calculating a content ratio (%) of each of the oil gases in the total content of the selected four oil gases; And
The combinations of the calculated% H2 and% CH4,% H2 and% C2H2,% C2H4 and% C2H2,% C2H4 and% CH4,% H2 and% C2H6,% C2H4 and% C2H6 are separated in the first step. A fourth step of determining a type of an internal defect of the diagnostic inflow transformer corresponding to an area of each type of internal defect; Internal fault diagnosis method of the inlet transformer through a combination of oil and gas content ratio comprising a. The method of claim 1, wherein the first step,
For each inlet transformer with known types of internal defects, partial discharge (PD), low energy discharge (D1), high energy discharge (D2), first thermal defect (t <300 ° C) (T1), and second thermal defect (300) Presets on the first XY plane with the values of the ratios% H2 and% CH4 represented by ° C <t <700 ° C) (T2) and the third thermal defect (t> 700 ° C) (T3) as x and y coordinates, respectively. Doing; And
The half region of the first XY plane is divided into a partial discharge (PD) defect region, a low energy discharge (D1) defect region, a high energy discharge (D2) defect region, and a first thermal defect (t <300) using the set plurality of coordinates. Dividing into a (T) region, a second thermal defect (300 占 폚 <t <700 占 폚) (T2) region, and a third thermal defect (t> 700 占 폚) (T3) region; Lt; / RTI &gt;
In the fourth step, the oil-in-gas content ratio is determined using the region corresponding to the x, y coordinates for the% H2 and% CH4 values calculated in the third step. Method of diagnosing internal defect of inlet transformer through combination. The method of claim 1, wherein the first step,
For each inlet transformer with known types of internal defects, x, y coordinates are used for the percentages% H2 and% C2H2 of thermal defects, partial discharges (PD), low energy discharges (D1), and high energy discharges (D2). Setting on the second XY plane; And
The half of the second XY plane is divided into a thermal defect region, a partial discharge (PD) defect region, a low energy discharge (D1) defect region, and a high energy discharge (D2) defect region using the set plurality of coordinates. Doing; Lt; / RTI &gt;
In the fourth step, the oil-in-gas content ratio, characterized in that for determining the internal defect of the diagnostic inlet transformer using the area corresponding to the x, y coordinates for the% H2 and% C2H2 value calculated in the third step. Method of diagnosing internal defect of inlet transformer through combination. The method of claim 1, wherein the first step,
For each inlet transformer with known types of internal defects, partial discharge (PD), low energy discharge (D1), high energy discharge (D2), first and second thermal defects (t <300 ℃, 300 ℃ <t <700 ℃) (T1, T2), and setting the ratio% C2H4 and% C2H2 values for each of the third thermal defects (t> 700 ° C.) on the third XY plane using the x and y coordinates, respectively; And
The half region of the third XY plane is divided into a partial discharge (PD) defect region, a low energy discharge (D1) defect region, a high energy discharge (D2) defect region, and first and second thermal defects using the set plurality of coordinates. dividing into a t <300 ° C, 300 ° C <t <700 ° C) (T1, T2) region, and a third thermal defect (t> 700 ° C) (T3) region; Including
In the fourth step, the oil-in-gas content ratio is determined using the region corresponding to the x, y coordinates for the% C2H4 and% C2H2 value calculated in the third step, the internal defect of the diagnostic inlet transformer. Method of diagnosing internal defect of inlet transformer through combination. The method of claim 1, wherein the first step,
For each inlet transformer with known types of internal defects, partial discharge (PD), low energy discharge (D1), high energy discharge (D2), first thermal defect (t <300 ° C) (T1), and second thermal defect (300) Setting the percentage% C2H4 and% CH4 values represented by ° C <t <700 ° C) (T2) and the third thermal defect (t> 700 ° C) on the fourth XY plane with x, y coordinates, respectively; And
The half region of the fourth XY plane is divided into a partial discharge (PD) defect region, a low energy discharge (D1) defect region, a high energy discharge (D2) defect region, and a first thermal defect (t <300) using the set plurality of coordinates. (C) (T1), the second thermal defect (300 ℃ <t <700 ℃) (T2) region, and the third thermal defect (t> 700 ℃) (T3) region; Including
In the fourth step, the oil-in-gas content ratio is determined using the region corresponding to the x, y coordinates for the% C2H4 and% CH4 value calculated in the third step, the internal defect of the diagnostic inflow transformer. Method of diagnosing internal defect of inlet transformer through combination. 6. The method according to any one of claims 2 to 5,
Each XY axis of the first to fourth XY plane has a range of 0% to 100%, respectively,% H2-% CH4 value,% H2-% C2H2 value,% C2H4-% C2H2 value,% C2H4-% CH4 value The defect area is a method for diagnosing internal defects of an inlet transformer through a combination of oil and gas content ratios, characterized in that the X-axis and the Y-axis are located in a triangular shape formed by connecting the points of 100% in a straight line. The method according to claim 6,
The method for diagnosing internal defects of the inlet transformer through the combination of oil and gas content ratios, wherein the content ratio values of the respective oil and gas gases calculated in the third step are all included in the defect area of the triangle shape. A first step of extracting gaseous gas of H2, CH4, C2H2, C2H4 and C2H6 for each inlet transformer whose type of internal defect is known;
By selecting four oil gases classified by internal defects among the five oil in gas extracted by the plurality of inflow transformers to calculate the content percentage (%) of each of the oil in the total content of the selected four oil in gas Second step;
The content ratio% H2 and% CH4 values, which are represented by the internal defects, are set in advance on a first XY plane using the first x and y coordinates, respectively, and the plurality of first x, y coordinates of the first XY plane are used. A third step of dividing a half area into each of the internal defect areas;
The content ratio% H2 and% C2H2 values, which are represented by the internal defects, are set in advance on the second XY plane using the second x, y coordinates, respectively, and the plurality of second x, y coordinates of the second XY plane are used. Dividing a half area into each of the internal defect areas;
The content ratio% C2H4 and% C2H2 values, which are represented by the internal defects, are set in advance on a third XY plane using the third x, y coordinates, respectively, and the third XY planes are controlled using the plurality of third x, y coordinates. A fifth step of dividing a half area into each of the internal defect areas;
The content ratio% C2H4 and% CH4 values, which are represented by the internal defects, are preset on the fourth XY plane using the fourth x, y coordinates, respectively, and the plurality of fourth x, y coordinates of the fourth XY plane are used. Dividing a half area into each of the internal defect areas;
Oil-in-oil H2, CH4, C2H2 and C2H4 are extracted from the insulating oil of the diagnostic inlet transformer for diagnosing internal defects, and the content ratios of the respective oil in the total oil content of the four oil gases extracted from the diagnostic inlet transformer are% H2 and% CH4. A seventh step of calculating the% C2H4 and% C2H2 values, respectively; And
Using at least one selected from among the% H2 and% CH4 values,% H2 and% C2H2 values,% C2H4 and% C2H2 values, and% C2H4 and% CH4 values among the content ratios of the oil-in-oil gas calculated in step 7. An eighth step of determining an internal defect of the diagnostic inflow transformer; Internal fault diagnosis method of the inlet transformer through a combination of water-in-oil content, characterized in that it comprises a.

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