KR20130074672A - Fault diagnosis method of oil filled transformer using composition of dissolved gases - Google Patents

Abstract

PURPOSE: An internal defect diagnosis method of an oil immersed transformer is provided to accurately diagnose an internal defect of the oil immersed transformer using a content ration of the dissolved gas which is generated in the internal defect. CONSTITUTION: An internal defect diagnosis method of an oil immersed transformer comprises a first step (S205) which calculates a content ratio of CH4/H2, C2H2/C2H4, C2H4/C2H6, and C2H4/CH4 among a dissolved gas content ratio; a second step which determines whether an internal defect is an electrical defect or a thermal defect corresponding the calculated CH4/H2 and C2H2/C2H4 to a predetermined internal area; and a third step which determines whether the calculated C2H2/C2H4 and C2H4/C2H6 are partial discharge (PD), low energy discharge or high energy discharge corresponding to the predetermined internal defect area in case the internal defect is the electrical defect. [Reference numerals] (AA) Start; (BB) Finish; (S201) Detect dissolved gases of an oil immersed transformer desired to diagnose internal defects; (S203) Measure H2, CH4, C2H2, C2H6, and C2H4 among the dissolved gases; (S205) Calculate values of CH4/H2, C2H2/C2H4, C2H4/C2H6, and C2H4/CH4 of the four dissolved gases; (S207) Determine the internal defects of the oil immersed transformer by using one or more values selected from values of CH4/H2 and C2H2/C2H4, C2H2/C2H4 and C2H4/C2H6, C2H4/C2H6 and C2H4/CH4, and C2H2/C2H4/ and C2H4/C2H6

Description

The method of diagnosing internal defects of the inlet transformer by the oil-in-oil composition ratio {FAULT DIAGNOSIS METHOD OF OIL FILLED TRANSFORMER USING COMPOSITION OF DISSOLVED GASES}

The present invention relates to a method for diagnosing internal defects of an inlet transformer, and more particularly, to a method for diagnosing internal defects of an inlet transformer by analyzing a composition ratio of gaseous gas generated during internal defects of the inlet transformer.

Inflow transformers installed in substations or power companies are one of the main facilities of the power supply system and require high reliability. These inlet transformers may cause electrical and mechanical performance deterioration due to deterioration during operation, which can lead to serious accidents if the phenomenon is 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.Insulating materials such as insulating oil, insulating paper, press board, etc. that come into contact with these heat generating sources are affected by heat and decomposed by chemical reactions. Happens. Most of these gases are dissolved in insulating oil. Therefore, it is possible to diagnose internal defects and the degree 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 and thermal faults. The detailed classifications are partial discharges (PD), low discharges (D1), Discharges of high energy (D2), first thermal fault t <300 ° C (T1), second thermal fault 300 ° C <t <700 ° C (Thermal fault 300 ° C <t Six defects are defined as <700 ° C) (T2) and the 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 diagnostic method based on the composition ratio (ratio) using the gas of five components reflects the pattern, composition and amount of change of the gas, so that the diagnosis result is high, but the accuracy of the diagnosis is high. Diagnosis is impossible.

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

Therefore, there has been a demand for the development of the internal fault diagnosis technology of the inlet transformer to improve the reliability of the internal fault diagnosis of the inlet transformer and to diagnose all the defective areas.

The present invention has been proposed to solve the above problems of the prior art, by using the composition ratio of the oil in gas generated when the internal defect of the inlet transformer of the inlet transformer through the oil in gas composition ratio to accurately diagnose the internal defect of the inlet transformer The purpose is to provide a method for diagnosing internal defects.

In addition, the present invention is to classify the internal defects of the inlet transformer into electrical and thermal defects and to diagnose the internal defects of the inlet transformer through the oil-in-gas composition ratio to determine the internal defects in stages according to the composition ratio of the oil in each defect. There is another purpose to provide.

Internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio of the present invention for achieving the above object, the internal fault diagnosis of the inlet transformer for diagnosing the internal fault by extracting and analyzing the oil in the gas from the diagnostic inlet transformer to diagnose the internal fault A method, comprising: a first step of calculating a composition ratio of CH 4 / H 2, C 2 H 2 / C 2 H 4, C 2 H 4 / C 2 H 6 and C 2 H 4 / CH 4 in the extracted oil gas; A second step of determining whether the internal defect is an electrical defect or a thermal defect by using the calculated CH4 / H2 and C2H2 / C2H4 corresponding to a preset internal defect region; And if the electrical defect is determined in the second step, the calculated C2H2 / C2H4 and C2H4 / C2H6 correspond to a partial discharge (PD), low energy discharge (D1) or high energy discharge ( D2) a third step of determining whether or not.

According to an embodiment of the present invention, the second step may include a first XY plane using x, y coordinates of CH4 / H2 and C2H2 / C2H4, which are represented by electrical defects and thermal defects for each of a plurality of inflow transformers whose internal defects are known. Presetting on a phase; And dividing an entire region of the first X-Y plane into an electrical defect region and a thermal defect region by using the set plurality of x and y coordinates. And the electrical defect or the thermal defect is determined using a region corresponding to the x, y coordinates for CH4 / H2 and C2H2 / C2H4 calculated in the first step.

In an embodiment of the present invention, the third step may include C2H2 / C2H4 and C2H4 / C2H6 that appear in partial discharge (PD), low energy discharge (D1), and high energy discharge (D2) for each of a plurality of inflow transformers in which electrical defects have occurred. Presetting on the second XY plane with x, y coordinates respectively; And dividing the entire area of the second X-Y plane into a partial discharge (PD) area, a low energy discharge (D1) area, and a high energy discharge (D2) area by using the set plurality of x and y coordinates. A partial discharge (PD), a low energy discharge (D1) or a high energy discharge (D2) using a region corresponding to the x, y coordinates for C2H2 / C2H4 and C2H4 / C2H6 calculated in the first step. To judge.

In an embodiment of the present disclosure, if the thermal defect is determined in the second step, the first thermal defect (t <300 ° C.) (T1) is calculated using the calculated C2H4 / C2H6 and C2H4 / CH4. A fourth step of determining whether it is a thermal defect (300 ° C. <t <700 ° C.) or a third thermal bond (t> 700 ° C.); And a second thermal defect using the C2H2 / C2H4 and C2H4 / C2H6 when the second thermal defect (300 ° C. <t <700 ° C.) or the third thermal bond (t> 700 ° C.) is determined in the fourth step. And a fifth step of determining whether or not (300 ° C. <t <700 ° C.) (T2) or the third thermal defect (t> 700 ° C.) (T3).

In an embodiment of the present disclosure, the fourth step may include the first thermal defect (t <300 ° C.) and the second thermal defect (300 ° C. <t <700 ° C.) or third for each of a plurality of inlet transformers in which thermal defects have occurred. Presetting C2H4 / C2H6 and C2H4 / CH4 represented by thermal bonds (t> 700 ° C.) on the third XY plane with x and y coordinates, respectively; And dividing the entire region of the third XY plane into a first thermal defect region and a second thermal defect region or a third thermal defect region by using the set x, y coordinates, calculated in the first step. The first thermal defect, the second thermal defect, or the third thermal defect is determined using a region corresponding to the x, y coordinates for C2H4 / C2H6 and C2H4 / CH4.

In an embodiment of the present disclosure, the fifth step may include the second thermal defect (300 ° C. <t <700 ° C.) (T 2) and the third thermal coupling (t>) for each of a plurality of inlet transformers whose types of internal defects are known. Setting C2H2 / C2H4 and C2H4 / C2H6 indicated by T3 in advance on the fourth XY plane, respectively as x, y coordinates; And dividing the entire area of the fourth XY plane into a second thermal defect (T2) region and a third thermal defect (T3) region by using the set x and y coordinates. And a second thermal defect T2 or a third thermal defect T3 using an area corresponding to the x, y coordinates for C2H2 / C2H4 and C2H4 / C2H6 calculated in the first step.

In addition, the method for diagnosing internal defects of the inflow transformer using the oil-in-gas composition ratio of the present invention comprises extracting the gas in oil for each inlet transformer having a known kind of internal defects and forming the composition ratio CH4 / H2, C2H2 / C2H4, C2H4 / C2H6 and C2H4 / CH4. A first step of calculating each; Among the internal defects, CH4 / H2 and C2H2 / C2H4, which are represented by electrical and thermal defects, are set on the first XY plane using x and y coordinates, respectively, and the first XY using the set multiple x, y coordinates. A second step of dividing the entire area of the plane into an electrical defect (E) region and a thermal defect (T) region; Among the electrical defects (E), C2H2 / C2H4 and C2H4 / C2H6, which are represented by partial discharge (PD), low energy discharge (D1) and high energy discharge (D2), are set on the second XY plane with x and y coordinates, respectively. A third step of dividing the entire area of the second XY plane into a partial discharge (PD) area, a low energy discharge (D1) area, and a high energy discharge (D2) area by using the set plurality of x, y coordinates; Among the thermal defects T, C2H4 / C2H6 which is represented by a first thermal defect (t <300 ° C) (T1) and a second thermal defect (300 ° C <t <700 ° C) or a third thermal bond (t> 700 ° C) And C2H4 / CH4 on the third XY plane using the x and y coordinates, respectively, and first thermal defects on the entire area of the third XY plane using the set plurality of x and y coordinates (t <300 ° C.). A fourth step of dividing into a (T1) region and a second thermal defect (300 ° C. <t <700 ° C.) or a third thermal bonding (t> 700 ° C.) region; A second thermal defect (300 ° C. <t <700 ° C.) or a third thermal defect (t>) of the second thermal defect (300 ° C. <t <700 ° C.) or the third thermal bonding (t> 700 ° C.). 700 ° C.) C2H2 / C2H4 and C2H4 / C2H6 appearing at (T3) are displayed on the fourth XY plane with x and y coordinates, respectively, and the entire area of the fourth XY plane using the set multiple x, y coordinates. Dividing the second into a second thermal defect (T2) region and a third thermal defect (T3) region; A sixth step of calculating the composition ratios of CH4 / H2, C2H2 / C2H4, C2H4 / C2H6, and C2H4 / CH4 by extracting oil gas from the insulating oil of the diagnostic inlet transformer for diagnosing internal defects; And determining an area corresponding to the calculated x, y coordinates consisting of two selected from among the calculated CH 4 / H 2, C 2 H 2 / C 2 H 4, C 2 H 4 / C 2 H 6, and C 2 H 4 / CH 4 in the first to fourth XY planes. A seventh step of determining the type of internal fault of the inlet transformer.

In an embodiment of the present disclosure, the seventh step may include determining, in the first XY plane, an area corresponding to the x, y coordinates for CH4 / H2 and C2H2 / C2H4 calculated in the sixth step. To determine whether it is an electrical fault or a thermal fault.

In an embodiment of the present disclosure, if it is determined that the electrical defect is the electrical defect, the second XY plane includes an area corresponding to the x, y coordinates for C2H2 / C2H4 and C2H4 / C2H6 calculated in the sixth step. And determining whether the electrical defect (E) is a partial discharge (PD), a low energy discharge (D1), or a high energy discharge (D2) by using the determined region.

In an embodiment of the present disclosure, if it is determined that the thermal defect T is the thermal defect T, the region corresponding to the x, y coordinates for C2H4 / C2H6 and C2H4 / CH4 calculated in the sixth step may be determined. 3 is determined on the XY plane and the thermal defect T is a first thermal defect (t <300 ° C.) T1, a second thermal defect (300 ° C. <t <700 ° C.) or a third using the determined region Determining whether it is a thermal bond (t> 700 ° C.).

In an embodiment of the present invention, if it is determined that the second thermal defect (300 ° C. <t <700 ° C.) or the third thermal bond (t> 700 ° C.), C2H2 / C2H4 and C2H4 / C2H6 calculated in the sixth step. Determine an area corresponding to the x, y coordinates with respect to the fourth XY plane and use the determined area to determine a second thermal defect (300 ° C. <t <700 ° C.) (T2) or a third thermal defect (t>). 700 ° C.) (T3).

In an embodiment of the present invention, the electrical defect region of the entire region of the first XY plane is a condition of CH4 / H2≤0.05 and C2H2 / C2H4≤0.4, and the conditions of CH4 / H2≤3 and C2H2 / C2H4> 0.4 At the same time, the thermal defect region satisfies the conditions of CH4 / H2> 0.05 and C2H2 / C2H4≤0.4 and the conditions of CH4 / H2> 3 and C2H2 / C2H4> 0.4.

In an embodiment of the present invention, the partial discharge (PD) region of the entire region of the second XY plane satisfies the conditions of C2H2 / C2H4≤2 and C2H4 / C2H6≤0.1, and the low energy discharge (D1) region is C2H2. / C2H4> 2 and C2H4 / C2H6≤1.5, the conditions of C2H2 / C2H4≤2 and 0.1 <C2H4 / C2H6≤1.5 and C2H2 / C2H4> 2.5 and C2H4 / C2H6> 1.5 are satisfied simultaneously The discharge (D2) region satisfies the conditions of C2H2 / C2H4≤2.5 and C2H4 / C2H6> 1.5.

In an embodiment of the present invention, the first thermal defect (t <300 ° C.) (T1) of the entire region of the third XY plane is C2H4 / C2H6≤0.2 and C2H4 / CH4≤0.2 and C2H4 / C2H6 The conditions of> 0.2 and 0.05 <C2H4 / CH4≤0.2 are simultaneously satisfied, and the second thermal defect ((300 ° C <t <700 ° C) (T2) or the third thermal defect (t> 700 ° C) region is C2H4 / The conditions of C2H6> 0.2 and C2H4 / CH4≤0.05 and the conditions of C2H4 / CH4> 0.2 are satisfied simultaneously.

In an embodiment of the present disclosure, the second thermal defect (300 ° C. <t <700 ° C.) (T2) region of the entire area of the fourth XY plane may be a condition of C 2 H 2 / C 2 H 4> 0.0005 and C 2 H 4 / C 2 H 6 ≦ 2, Simultaneously satisfying the conditions of 0.0005 <C2H2 / C2H4≤0.02 and 2 <C2H4 / C2H6≤4.68, the third thermal defect (t> 700 ° C) (T3) region is a condition of C2H2 / C2H4≤0.0005, and 0.0005 <C2H2 The conditions of /C2H4≤0.02 and C2H4 / C2H6> 4.68 and the conditions of C2H2 / C2H4> 0.02 and C2H4 / C2H6> 2 are simultaneously satisfied.

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.
Figure 4 is a schematic diagram of the internal fault diagnosis process of the inlet transformer according to the present invention.
5 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer through a gas in oil composition ratio 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 may include a gas in gas detection sensor 11, a gas in gas composition ratio calculating 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-gas composition ratio calculation part 12 calculates these composition ratios CH4 / H2, C2H2 / C2H4, C2H4 / C2H6, and C2H4 / CH4, among the oil-in-oil gas detected by the oil-in-gas detection sensor 11, respectively. Here, for example, CH 4 / H 2 represents the composition ratio of CH 4 to H 2.

A database (DB) 13 stores data serving as reference information for determining an internal defect of the inflow transformer 1. Specifically, in this embodiment, the database (DB) 13 in the present embodiment is the first X-Y plane, C2H2 / C2H4 and C2H4 / C2H6 X-axis and CH2 / C2H2 / C2H4, respectively, X axis and Y axis A second XY planar view made up of and Y axes, a third XY planar view made up of C2H4 / C2H6 and C2H4 / CH4 as X and Y axes, and a third XY planar view formed of C2H2 / C2H4 and C2H4 / C2H6, respectively The fourth XY plan view and various data related to each of these plan views are stored. For example, the defect area is classified according to the type of internal defect. At this time, these four plan views are used to determine the types of internal defects using the composition ratios of CH4 / H2, C2H2 / C2H4, C2H4 / C2H6 and C2H4 / CH4 calculated by the diagnostic inflow transformer for determining internal defects.

In addition, the above four XY planarities detect the CH4 / H2, C2H2 / C2H4, C2H4 / C2H6 and C2H4 / CH4 values for each of the inlet transformers whose types of internal defects are known, and calculate the composition ratios CH4 / H2 and C2H2. / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4, C2H2 / C2H4 and C2H4 / C2H6 are preset on the first to fourth XY planes with x, y coordinates, respectively, Each x, y coordinate of is used to classify the area by type of internal defect.

The control unit 14 calculates CH4 / H2 and C2H2 / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4, C2H2 / C2H4 and calculated for the diagnostic inlet transformer 1 for determining internal defects, respectively. C2H4 / C2H6 is used to determine the internal defect of the corresponding diagnostic inlet transformer (1). Specifically, the control unit 14 according to the present embodiment is the composition ratio CH4 / H2 and C2H2 / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4, Using C2H2 / C2H4 and C2H4 / C2H6 as x and y coordinates, respectively, it is determined whether the respective x and y coordinates correspond to which defect area in the first to fourth XY planes stored in the database (DB) 13 and finally. Determine the internal defect.

Furthermore, CH4 / H2 and C2H2 / C2H4 are used to determine whether the internal defect is an electrical defect (E) or a thermal defect (T). If the electrical defect (E) is determined from the determination result, C2H2 / C2H4 and C2H4 / C2H6 are determined. It determines whether it is a partial discharge (PD), a low energy discharge (D1) or a high energy discharge (D2). If the result of the determination is a thermal defect (T), whether the first thermal defect (t <300 ° C) (T1) or the second thermal defect (300 ° C <t <700 ° C) using C2H4 / C2H6 and C2H4 / CH4 It is determined whether or not (T2) or the third thermal bond (t> 700 ℃) (T3), wherein, more specifically, the second thermal defect (300 ℃ <t <700 ℃) using C2H2 / C2H4 and C2H4 / C2H6 It is further determined in detail whether it is (T2) or the third thermal defect (t> 700 ° C.) (T3).

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 CH4 / H2 and C2H2 / C2H4 values, C2H2 / C2H4 and C2H4 / C2H6 values, C2H4 / C2H6 and C2H4 / CH4 values, and C2H2 / C2H4 values for a plurality of inlet transformers with known types of internal defects. And C2H4 / C2H6 values as X-axis and Y-axis, respectively, to show internal defects according to the composition ratio of the oil-in-gas 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 defect type) is analyzed for a plurality of inflow transformers that have internal defects while operating in actual sites.

Specifically, in FIG. 2A, CH4 / H2 and C2H2 / C2H4 are X-axis and Y-axis, respectively, and the range is set to 1.0 × 10 ⁻⁶ to 1.0 × 10 ⁶ , respectively. For example, reference numeral A denotes a case where CH 4 / H 2 and C 2 H 2 / C 2 H 4 of a specific inlet transformer are 1.0 × 10 ⁵ and 1.0 × 10 ⁴ , respectively. As described above, when the type of internal defects indicates CH4 / H2 to C2H2 / C2H4 for each inlet transformer, the first XY plan view of FIG. 2A is shown. In addition, the defect area is determined by dividing the values shown in the first XY plan view of FIG. 2A by the type of the internal defect. At this time, the divided internal defects are the electrical defect (E) region and the thermal defect (E) region. Looking at the range of CH4 / H2-C2H2 / C2H4 for each internal defect determined in the first XY plan view according to the present embodiment is shown in Table 1.

division
(1X-Y plane) Condition 1 Condition 2 X Y X Y E X≤0.05 Y≤0.4 X≤3 Y> 0.4 T X> 0.05 Y≤0.4 X> 3 Y> 0.4

Meanwhile, FIG. 2B shows C2H2 / C2H4 and C2H4 / C2H6, FIG. 2C shows C2H4 / C2H6 and C2H4 / CH4, and FIG. 2D shows C2H2 / C2H4 and C2H4 / C2H6 as X and Y axes, respectively, and the range is 1.0 × 10. ^It is set to ^-6 to 1.0 × 10 ⁶ . 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 XY plan views. Looking at the range of the oil-in-oil composition ratio for each of the internal defects determined in the second to fourth XY plan view according to the present embodiment are shown in Tables 2, 3, and 4.

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 among the electrical defects E are determined.

division
(2X-Y plane) Condition 1 Condition 2 Condition 3 X Y X Y X Y PD X≤2 Y≤1 D1 X> 2 Y≤1.5 X≤2 0.1 <Y≤1.5 X> 2.5 Y> 1.5 D2 X≤2.5 Y> 1.5

In addition, in the third XY plan view of FIG. 2C, the first thermal defect (t <300 ° C.) T1 and the second thermal defect (300 ° C. <t <700 ° C.) (T2) or the third thermal defect (t> 700 ° C.). (T3).

division
(3X-Y plane) Condition 1 Condition 2 X Y X Y T1 X≤0.2 Y≤0.2 X> 0.2 0.05 <Y≤0.2 T2 & T3 X> 0.2 Y≤0.05 Y> 0.2

In addition, in the fourth X-Y plan view of FIG. 2D, it is specifically determined whether the second thermal defect (300 ° C. <t <700 ° C.) T2 or the third thermal defect (t> 700 ° C.).

division
(3X-Y plane) Condition 1 Condition 2 Condition 3 X Y X Y X Y T2 X> 0.0005 Y≤2 0.0005 <X≤0.02 2 <Y≤4.68 T3 X≤0.0005 0.0005 <X≤0.02 Y> 4.68 X> 0.02 Y> 2

As described above, the internal defects of the diagnostic inflow transformer for diagnosing the internal defects are determined using the defect regions for the internal defects respectively divided in the first to fourth XY planes. That is, CH4 / H2 and C2H2 / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4, C2H2 / C2H4 and C2H4 / C2H6, respectively, calculated by the diagnostic inlet transformer, respectively, as the x, y coordinates. The defect area corresponding to the fourth XY plan view is determined, and the internal defect is determined from the defect area.

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 gas is detected for each of a plurality of inlet transformers having known types of internal defects (S101). H2, CH4, C2H2, C2H4 and C2H6 are extracted from the detected oil in gas and the amount thereof is measured (S103). The composition ratios CH4 / H2, C2H2 / C2H4, C2H4 / C2H6, and C2H4 / C2H4 of the five oil components extracted as described above are respectively calculated (S105). The first to fourth X-Y plan views are respectively set using the plurality of composition ratios calculated as described above.

First, the process of setting the first X-Y plan view will be described. The CH4 / H2 and C2H2 / C2H4 values appearing for each inlet transformer whose known internal defects are known for each internal defect type are set in the first XY plane using the first x and y coordinates (S107). The entire area of the first XY plane is divided into an electrical defect (E) region and a thermal defect (T) region by using the plurality of first x and y coordinates (S109).

Subsequently, C2H2 / C2H4 and C2H4 / C2H6 values, which are represented by types of internal defects, are set on the second XY plane using the second x and y coordinates, respectively (S111), and the plurality of set second x, y coordinates are used. The entire region of the second XY plane is divided into a partial discharge PD region, a low energy discharge D1 region, and a high energy discharge D2 region (S113).

In addition, the C2H4 / C2H6 and C2H4 / CH4 values appearing according to the types of internal defects are set on the third XY plane using the third x and y coordinates, respectively (S115), and the plurality of third x and y coordinates are used. The entire region of the third XY plane by the first thermal defect (t <300 ° C) (T1) region and the second thermal defect (300 ° C <t <700 ° C) (T2) or the third thermal bond (t> 700 ° C). (T3) area (S117).

Subsequently, the C2H2 / C2H4 and C2H4 / C2H6 values appearing for each type of internal defect are set on the fourth XY plane with the fourth x, y coordinates (S119), and the set plurality of fourth x, y coordinates are set. The entire region of the fourth XY plane is divided into a second thermal defect (300 ° C. <t <700 ° C.) (T2) region and a third thermal defect (t> 700 ° C.) region (S121).

As described above, the first to fourth XY plan views obtain a composition ratio between selected oil in gas among five oil in gas extracted from a plurality of inflow transformers whose types of internal defects are known in advance. It can be set on 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.

Figure 4 is a schematic diagram of the internal fault diagnosis process of the inlet transformer according to the present invention.

Referring to FIG. 4, in the method of diagnosing internal defects of the inflow transformer according to the present invention, the diagnosis inflow transformer for diagnosing the internal defect is preferentially an electrical defect (E) or a thermal defect using CH4 / H2 and C2H2 / C2H4. (T) is judged first.

If the result of the determination is that the electrical defect (E), more specifically using the C2H2 / C2H4 and C2H4 / C2H6 determines whether the partial discharge (PD), low energy discharge (D1) or high energy discharge (D2).

On the contrary, if it is determined that the thermal defect T is the first thermal defect (t <300 ° C) (T1) or the second thermal defect (300 ° C <t <700 ° C) using C2H4 / C2H6 and C2H4 / CH4 ( T2) or the third thermal bond (t> 700 ° C.) (T3). Here, more specifically, using C2H2 / C2H4 and C2H4 / C2H6, specifically, whether the second thermal defect (300 ° C. <t <700 ° C.) (T2) or the third thermal defect (t> 700 ° C.) (T3) is used. Judge.

5 is a flowchart illustrating a method for diagnosing an internal defect of an inflow transformer according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in the method of diagnosing internal defects of the inflow transformer of the present invention, first, the gas in the oil contained in the insulating oil of the diagnostic inflow transformer 1 for diagnosing the internal defect is detected (S201). H2, CH4, C2H2, C2H4 and C2H6 are extracted from the detected oil in gas and the amount of gas is measured (S203). Composition ratios CH4 / H2, C2H2 / C2H4, C2H4 / C2H6, and C2H4 / CH4 are respectively calculated from the extracted oil in five components (S205). The internal defects of the diagnostic inlet transformer 1 are then determined using the calculated CH4 / H2 and C2H2 / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4, C2H2 / C2H4 and C2H4 / C2H6. (S207). Here, in the internal defect determining step of S207, a region corresponding to the values of CH4 / H2 and C2H2 / C2H4 is determined from the defect regions divided in the first XY plane, and the electrical defects (E) and the thermal defects are determined using the determined defect regions. Judge (T). In addition, the areas corresponding to the values of C2H2 / C2H4 and C2H4 / C2H6 are determined in the defect areas divided in the second XY plane, and partial discharge (PD) and low energy discharge (D1) among electrical defects are determined using the determined defect areas. ), And determine the high energy discharge (D2). Also, regions corresponding to C2H4 / C2H6 and C2H4 / CH4 values are determined in the defect regions divided in the third XY plan view, and the first thermal defects (t <300 ° C.) (T1) and the second are determined using the determined defect regions. The thermal defect (300 ° C. <t <700 ° C.) (T2) or the third thermal bond (t> 700 ° C.) T3 is determined. In addition, a region corresponding to the values of C2H2 / C2H4 and C2H4 / C2H6 is determined from the defect regions divided in the fourth XY plan view, and more specifically, the second thermal defect ((300 ° C <t <700 ° C.) is determined using the determined defect region. (T2) or the third thermal defect ((t> 700 ° C.) (T3).

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 composition ratio calculation unit
13: database (DB) 14: control unit

Claims (15)

In the internal fault diagnosis method of the inlet transformer for extracting and analyzing the oil in the gas from the diagnostic inlet transformer to diagnose the internal defect, the internal fault,
A first step of calculating a composition ratio of CH 4 / H 2, C 2 H 2 / C 2 H 4, C 2 H 4 / C 2 H 6, and C 2 H 4 / CH 4 in the extracted oil gas;
A second step of determining whether the internal defect is an electrical defect (E) or a thermal defect (T) by using the calculated CH4 / H2 and C2H2 / C2H4 corresponding to a preset internal defect region; And
If the result of the determination in the second step is the electrical defect (E), the calculated C2H2 / C2H4 and C2H4 / C2H6 correspond to a predetermined internal defect area or partial discharge (PD), low energy discharge (D1) or high energy discharge (D2) determining whether it is a third step; Internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio comprising a. The method of claim 1, wherein the second step,
Presetting CH4 / H2 and C2H2 / C2H4 represented by electrical defects and thermal defects for each of a plurality of inflow transformers whose types of internal defects are known on the first XY plane with x and y coordinates, respectively; And
Dividing an entire region of the first XY plane into an electrical defect (E) region and a thermal defect (T) region by using the set plurality of x, y coordinates; Lt; / RTI &gt;
Inlet transformer through the oil-in-oil composition ratio for determining the electrical defect (T) or thermal defect (E) by using the area corresponding to the x, y coordinates for the CH4 / H2 and C2H2 / C2H4 calculated in the first step Internal fault diagnosis method. The method of claim 1, wherein the third step,
C2H2 / C2H4 and C2H4 / C2H6 represented by partial discharge (PD), high energy discharge (D1), and low energy discharge (D2) for each inlet transformer having electrical defects on the second XY plane, respectively. Setting in advance; And
Dividing the entire area of the second XY plane into a partial discharge (PD) area, a low energy discharge (D1) area, and a high energy discharge (D2) area by using the set plurality of x, y coordinates; Lt; / RTI &gt;
Water-in-oil gas for determining partial discharge (PD), low energy discharge (D1) or high energy discharge (D2) using a region corresponding to x, y coordinates for C2H2 / C2H4 and C2H4 / C2H6 calculated in the first step A method for diagnosing internal defects of inlet transformer through composition ratio. The method of claim 1,
If the thermal defect T is determined as the result of the second step, the first thermal defect (t <300 ° C.) (T1) is calculated using the calculated C2H4 / C2H6 and C2H4 / CH4, or the second thermal defect (300 ° C.). a fourth step of determining whether t <700 ° C.) (T2) or the third thermal bond (t> 700 ° C.) (T3); And
If the second thermal defect (300 ℃ <t <700 ℃) (T2) or the third thermal bond (t> 700 ℃) (T3) as a result of the determination of the fourth step more specifically the C2H2 / C2H4 and C2H4 / C2H6 A fifth step of determining whether the second thermal defect (300 ° C. <t <700 ° C.) (T2) or the third thermal defect (t> 700 ° C.) T3 is used; Internal fault diagnosis method of the inlet transformer through the oil-in-gas composition ratio further comprising. The method of claim 4, wherein the fourth step,
The first thermal defect (t <300 ° C.) and the second thermal defect (300 ° C. <t <700 ° C.) (T2) or the third thermal coupling (t> 700 ° C.) (T3) for each of a plurality of inlet transformers in which thermal defects have occurred. Setting C2H4 / C2H6 and C2H4 / CH4 appearing at each X) in x, y coordinates on the third XY plane in advance; And
Dividing the entire area of the third XY plane into a first thermal defect (T1) region and a second or third thermal defect region by using the set x, y coordinates; Lt; / RTI &gt;
Using the region corresponding to the x, y coordinates for C2H4 / C2H6 and C2H4 / CH4 calculated in the first step to determine the oil-in-oil composition ratio for determining the first thermal defect (T1) or the second or third thermal defect Internal fault diagnosis method of inflow transformer through The method of claim 5, wherein the fifth step,
C2H2 / C2H4 and C2H4 appearing by the second thermal defect (300 ° C <t <700 ° C) (T2) and the third thermal defect (t> 700 ° C) (T3) for each of the inflow transformers of which the type of internal defects is known Presetting / C2H6 on the fourth XY plane with x, y coordinates respectively; And
Dividing the entire area of the fourth XY plane into a second thermal defect (T2) region and a third thermal defect (T3) region by using the set plurality of x, y coordinates; Lt; / RTI &gt;
Through the oil in gas composition ratio to determine the second thermal defect (T2) or the third thermal defect (T3) by using the area corresponding to the x, y coordinates for the C2H2 / C2H4 and C2H4 / C2H6 calculated in the first step Method of Diagnosing Internal Defect in Inlet Transformer. A first step of extracting gas in oil by a plurality of inflow transformers having known types of internal defects and calculating their composition ratios CH 4 / H 2, C 2 H 2 / C 2 H 4, C 2 H 4 / C 2 H 6 and C 2 H 4 / CH 4, respectively;
Among the internal defects, CH4 / H2 and C2H2 / C2H4, which are represented by electrical defects (E) and thermal defects (T), are set on the first XY plane using x, y coordinates, respectively, and the plurality of x, y coordinates are used. A second step of dividing the entire region of the first XY plane into an electrical defect (E) region and a thermal defect (T) region;
Among the electrical defects, C2H2 / C2H4 and C2H4 / C2H6, which are represented by partial discharge (PD), low energy discharge (D1) and high energy discharge (D2), are set on the second XY plane with x and y coordinates, respectively, A third step of dividing the entire region of the second XY plane into a partial discharge (PD) region, a low energy discharge (D1) region, and a high energy discharge (D2) region by using x, y coordinates of?
Among the thermal defects T, a first thermal defect (t <300 ° C) T1 and a second thermal defect (300 ° C <t <700 ° C) (T2) or a third thermal bond (t> 700 ° C) (T3 C2H4 / C2H6 and C2H4 / CH4 each appearing on the third XY plane are set as x and y coordinates, and the entire area of the third XY plane is first thermally decomposed using the plurality of set x and y coordinates. A fourth step of dividing into a (T1) region and a second or third thermal defect region (T2 &T3);
The second thermal defect (300 ° C. <t <700 ° C.) (T2) or the third thermal bond (t> 700 ° C.) (T3); 3 C2H2 / C2H4 and C2H4 / C2H6, which appear for each thermal defect (t> 700 ° C.) (T3), are displayed on the fourth XY plane using x and y coordinates, respectively, and the second and second coordinates are set using the plurality of x and y coordinates. A fifth step of dividing the entire region of the 4 XY plane into a second thermal defect (T2) region and a third thermal defect (T3) region;
A sixth step of calculating the composition ratios of CH4 / H2, C2H2 / C2H4, C2H4 / C2H6, and C2H4 / CH4 by extracting gaseous gas from the diagnostic inflow transformer for diagnosing internal defects; And
The areas corresponding to the calculated x, y coordinates consisting of two selected from the calculated CH4 / H2, C2H2 / C2H4, C2H4 / C2H6 and C2H4 / CH4 are respectively determined in the first to fourth XY planes, and the diagnostic area is determined from the determined areas. A seventh step of determining a type of internal defect of the inflow transformer; Internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio comprising a. The method of claim 7, wherein the seventh step,
The region corresponding to the x, y coordinates for CH4 / H2 and C2H2 / C2H4 calculated in the sixth step is determined in the first XY plane and the determined region is an electrical defect (E) or a thermal defect (T). The internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio comprising the step of determining whether or not). The method of claim 8, wherein the seventh step,
If it is determined that the electrical defect (E), the area corresponding to the x, y coordinates for C2H2 / C2H4 and C2H4 / C2H6 calculated in the sixth step is determined in the second XY plane and using the determined area A method for diagnosing an internal defect of an inlet transformer through a gas-to-oil composition ratio comprising determining whether the electrical defect is a partial discharge (PD), a low energy discharge (D1), or a high energy discharge (D2). The method of claim 8, wherein the seventh step,
If it is determined that the thermal defect (T), the area corresponding to the x, y coordinates for C2H4 / C2H6 and C2H4 / CH4 calculated in the sixth step is determined on the third XY plane and using the determined area Whether the thermal defect (T) is a first thermal defect (t <300 ° C) (T1), a second thermal defect (300 ° C <t <700 ° C) (T2) or a third thermal bond (t> 700 ° C) (T3) A method for diagnosing internal defects of the inlet transformer through the oil-in-gas composition ratio comprising the step of determining whether the thermal defect (t> 300 ℃). The method of claim 10,
If it is determined that the second thermal defect (300 ℃ <t <700 ℃) (T2) or the third thermal bond (t> 700 ℃) (T3) to the C2H2 / C2H4 and C2H4 / C2H6 calculated in the sixth step The area corresponding to the x, y coordinates for the second is determined on the fourth XY plane and the second thermal defect (300 ° C. <t <700 ° C.) (T2) or the second thermal defect (t) using the determined area. 700 ℃) (T3) the internal fault diagnosis method of the inlet transformer through the oil-in-gas composition ratio comprising the step of determining. The method of claim 7, wherein
The electrical defect region of the entire region of the first XY plane simultaneously satisfies the conditions of CH4 / H2≤0.05 and C2H2 / C2H4≤0.4, and the conditions of CH4 / H2≤3 and C2H2 / C2H4> 0.4, and the thermal defect The area is to satisfy the condition of CH4 / H2> 0.05 and C2H2 / C2H4≤0.4 and the condition of CH4 / H2> 3 and C2H2 / C2H4> 0.4 at the same time. . The method of claim 7, wherein
The partial discharge (PD) region of the entire region of the second XY plane satisfies the conditions of C2H2 / C2H4≤2 and C2H4 / C2H6≤0.1, and the low energy discharge (D1) region is C2H2 / C2H4> 2 and C2H4 / The conditions of C2H6≤1.5, C2H2 / C2H4≤2 and 0.1 <C2H4 / C2H6≤1.5, and C2H2 / C2H4> 2.5 and C2H4 / C2H6> 1.5 are simultaneously satisfied, and the high energy discharge (D2) region is C2H2. /C2H4≤2.5 and C2H4 / C2H6> 1.5 satisfy the conditions of the inlet transformer through the oil-in-gas composition ratio characterized in that the diagnostic method. The method of claim 7, wherein
The first thermal defect (t <300 ° C.) (T1) region of the entire region of the third XY plane is C2H4 / C2H6≤0.2 and C2H4 / CH4≤0.2, and C2H4 / C2H6> 0.2 and 0.05 <C2H4 / Simultaneously satisfying the condition of CH 4 ≤ 0.2, the second thermal defect ((300 ℃ <t <700 ℃) (T2) or the third thermal defect (t> 700 ℃) region is C2H4 / C2H6> 0.2 and C2H4 / CH4 A method for diagnosing internal defects of an inlet transformer through a gas-to-oil composition ratio, characterized by satisfying a condition of ≤0.05 and a condition of C2H4 / CH4> 0.2. The method of claim 7, wherein
The second thermal defect (300 ° C. <t <700 ° C.) (T2) area of the entire area of the fourth XY plane is C2H2 / C2H4> 0.0005 and C2H4 / C2H6≤2, and 0.0005 <C2H2 / C2H4≤0.02 And 2 <C2H4 / C2H6≤4.68 at the same time, wherein the third thermal defect (t> 700 ° C) (T3) region is C2H2 / C2H4≤0.0005 and 0.0005 <C2H2 / C2H4≤0.02 and C2H4 / A method for diagnosing internal defects of an inlet transformer through a gas-to-oil ratio, characterized by simultaneously satisfying the conditions of C2H6> 4.68 and C2H2 / C2H4> 0.02 and C2H4 / C2H6> 2.

Images