KR20130074674A - Fault diagnosis method of oil filled transformer using composition ratio 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 dissolved gas composition ratio in the internal defect of the oil immersed transformer. CONSTITUTION: An internal defect diagnosis method of an oil immersed transformer which diagnoses an internal defect by extracting and analyzing dissolved gas comprises a first step (S205) which calculates CH4/H2 and C2H2/CH4 from the extracted dissolved gas; and a second step (S207) which determines whether the internal defect is partial discharge (PD) or energy discharge between a thermal defect, an electric defect corresponding the CH4/H2 and C2H2/CH4 to a predetermined internal defect area. [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, C2H4, and C2H6; (S205) Calculate content ratios of CH4/H2, C2H2/CH4, C2H4/C2H6, and C2H2/C2H4; (S207) Determine the internal defects of the oil immersed transformer by the values of CH4/H2, C2H2/CH4, C2H4/C2H6, and C2H2/C2H4

Description

Diagnosis method of internal defect of inflow transformer by oil-in-oil composition ratio {FAULT DIAGNOSIS METHOD OF OIL FILLED TRANSFORMER USING COMPOSITION RATIO 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 divided into electrical faults and thermal faults. In detail, 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 gases to be analyzed in these international standards include hydrogen (H ₂ ), methane (CH ₄ ), ethane (C ₂ H ₆ ), ethylene (ethylene; C ₂ H ₄ ), acetylene ( acetylen; C ₂ H ₂ ) and five components.

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 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 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.

Inlet transformer internal fault diagnosis method through the oil-in-oil composition ratio of the present invention to achieve the above object, the internal fault of the inlet transformer for diagnosing the internal defect by extracting and analyzing the oil in the gas in the diagnostic inlet transformer to diagnose the internal defect A diagnostic method comprising: a first step of calculating CH 4 / H 2 and C 2 H 2 / CH 4 from the extracted oil gas; And determining whether the internal defect is a thermal defect, a partial discharge (PD), or an energy discharge (D1, D2) in response to the calculated CH4 / H2 and C2H2 / CH4 corresponding to a preset internal defect region. Includes two steps.

According to an embodiment of the present invention, the second step may include thermal defects for each of a plurality of inflow transformers of which the type of internal defects is known, and CH4 / H2 and partial discharge (PD) and energy discharge (D1, D2) among electrical defects. Presetting C2H2 / CH4 on the first XY plane with x, y coordinates respectively; And dividing an entire region of the first XY plane into a thermal defect region, a partial discharge (PD) region, and an energy discharge (D1, D2) region among electrical defects by using the set plurality of coordinates. The thermal defect, partial discharge (PD) or energy discharge (D1, D2) are determined using a region corresponding to the x, y coordinates for CH4 / H2 and C2H2 / CH4 calculated in step 1.

In addition, the internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio according to the present invention, the internal fault diagnosis method of the inlet transformer for diagnosing the internal defect by extracting and analyzing the oil in the gas in the diagnostic inlet transformer to diagnose the internal defect In the first step of calculating the C2H4 / C2H6 and C2H2 / C2H4 in the extracted oil gas; And using the calculated C2H4 / C2H6 and C2H2 / C2H4, whether the internal defect is partial discharge (PD), low energy discharge (D1), high energy discharge (D2), or first thermal defect among thermal defects. The second step of determining whether (t <300 ° C) (T1), the second thermal defect (300 ° C <t <700 ° C) (T2), the third thermal defect (t> 700 ° C) (T3) Include.

In an exemplary embodiment of the present invention, the second step may include a partial discharge (PD), a low energy discharge (D1), a high energy discharge (D2), and a thermal defect among electrical defects for each of a plurality of inflow transformers having known types of internal defects. C2H4 / C2H6 and C2H2 which appear by 1 thermal defect (t <300 ° C) (T1), second thermal defect (300 ° C <t <700 ° C) (T2), and third thermal defect (t> 700 ° C) (T3) Presetting / C2H4 on the second XY plane with x, y coordinates respectively; And a partial discharge (PD) area, a low energy discharge (D2) area, a high energy discharge (D3) area, a first thermal defect (T1) area, and a first area of the second XY plane using the set plurality of coordinates. Dividing into a second thermal defect (T2) region and a third thermal defect (T3) region; It includes, the partial discharge (PD), low energy discharge (D2), high energy discharge (D3) using the area corresponding to the x, y coordinates for the C2H4 / C2H6 and C2H2 / C2H4 calculated in the first step The first thermal defect T1, the second thermal defect T2, and the third thermal defect T3 are determined.

In addition, the internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio according to the present invention, collecting the oil in the gas for each of a plurality of inlet transformers of known types of internal defects and the CH4 / H2 and C2H2 / CH4 from the collected oil gas A first step of calculating each; Among the internal defects, CH4 / H2 and C2H2 / CH4, which appear for each of the thermal defects, the partial discharges PD and the energy discharges D1 and D2, are set on the first XY plane with x and y coordinates, respectively. A second step of dividing the entire area of the first XY plane into a thermal defect area, a partial discharge (PD) area, and an energy discharge (D1, D2) area by using a plurality of set coordinates; Extracting oil-in-oil gas from the insulating oil of the inflow transformer for diagnosing internal defects, and calculating CH 4 / H 2 and C 2 H 2 / CH 4 from the oil-in-gas; And determining x, y coordinates of CH4 / H2 and C2H2 / CH4 calculated in the third step in the first XY plane, and whether the internal defect of the diagnostic inflow transformer is a thermal defect from the determined region, or partial discharge (PD). ) Or a fourth step of determining whether the energy discharge (D1, D2).

In an embodiment of the present invention, the thermal defect region of the entire region of the first XY plane is 2 <CH4 / H2 and 0.3 <C2H2 / CH4 or 0.01 <C2H2 / CH4≤0.3 or 1 <CH4 / H2 and C2H2 / CH4 ≤0.01 and the PD region is CH4 / H2≤1 and C2H2 / CH4≤0.01 and the energy discharge (D1, D2) regions are CH4 / H2≤2 and 0.3 <C2H2 / CH4.

In addition, the internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio according to the present invention, the oil-in-water gas for each of the inlet transformers of known types of internal defects are collected and the C2H4 / C2H6 and C2H2 / C2H4 from the collected oil gas A first step of calculating each; Partial discharge (PD) of electrical defects, high energy discharge (D1), low energy discharge (D2) of the internal defects and the first thermal defect (t <300 ℃) (T1) of the thermal defects, the second thermal defect (300 ℃) C2H4 / C2H6 and C2H2 / C2H4 which appear for each of <t <700 ° C) (T2) and third thermal defect (t> 700 ° C) (T3), respectively, have x and y coordinates set on the second XY plane, respectively, The entire area of the second XY plane is divided into a partial discharge (PD) area, a low energy discharge (D1) area, a high energy discharge (D2) area, and a first thermal defect (t <300 ° C.) (T1) using a plurality of coordinates. A second step of dividing into a region, a second thermal defect (300 ° C. <t <700 ° C.) (T2) region, and a third thermal defect (t> 700 ° C.) (T3) region; Extracting oil-in-oil gas from the insulating oil of the diagnostic inflow transformer for diagnosing internal defects, and calculating C2H4 / C2H6 and C2H2 / C2H4 from the oil-in-gas; And determining the x, y coordinates of C2H4 / C2H6 and C2H2 / C2H4 calculated in the third step in the second XY plane, and whether the internal defect of the diagnostic inflow transformer is partial discharge (PD) from the determined area. Whether it is discharge D1, high energy discharge D2, first thermal defect (t <300 ° C) (T1), second thermal defect (300 ° C <t <700 ° C) (T2) or third thermal And a fourth step of determining whether it is a defect (t> 700 ° C.) T3.

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 and 2B are first and second XY plan views according to the present invention;
3 is a flowchart illustrating a process of setting the first and second 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. The oil-in-oil detection sensor 11 is composed of an extraction unit for extracting the oil in gas dissolved in the insulating oil of the inlet transformer 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 calculating unit 12 calculates the composition ratios CH 4 / H 2, C 2 H 2 / CH 4, C 2 H 4 / C 2 H 6, and C 2 H 2 / C 2 H 4 of the selected oil in gas among the five oil in gas detected by the oil in gas detection sensor 11. Here, for example, CH 4 / H 2 represents the composition ratio of CH 4 to H 2.

The database 13 stores data that becomes reference information for determining an internal defect of the inflow transformer. Specifically, in this embodiment, the database (DB) 13 in the present embodiment is a first XY plane, C2H4 / C2H6 and C2H2 / C2H4 X-axis, respectively made of CH4 / H2 and C2H2 / CH4 X axis and Y axis, respectively And a second XY plan view made of the Y axis 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 two plans are for determining the type of internal defects using the composition ratio CH4 / H2, C2H2 / C2H4, C2H4 / C2H6 and C2H2 / C2H4 calculated in the diagnostic inlet transformer to determine the internal defects.

In addition, the two XY planes are CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 calculated from five oil in gas H2, CH4, C2H2, C2H4, C2H6 detected for each inlet transformer having a known kind of internal defect. The / C2H4 is set in advance on the first and second XY planes by using x and y coordinates, respectively, and the regions are classified according to types of internal defects using the plurality of x and y coordinates set in this way.

The controller 14 determines internal defects of the corresponding diagnostic inflow transformer using CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 calculated for the diagnostic inflow transformer for which the internal defect is to be determined. Specifically, the control unit 14 of the present embodiment is a composition ratio (ratio) of the oil-in-oil gas detected by the diagnostic inlet transformer, that is, CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 as x, y coordinates respectively It is determined whether each x, y coordinate corresponds to a defective area in the first and second XY planes stored in the database (DB) 13 to finally determine the corresponding internal defect.

More specifically, in one embodiment, using CH4 / H2 and C2H2 / CH4 to determine whether the internal defect is a thermal defect (T) or a partial discharge (PD) or an energy discharge (D1, D2) among the electrical defects (E). To judge. Further, in another embodiment, the internal defect using C2H4 / C2H6 and C2H2 / C2H4 is partial discharge (PD), low energy discharge (D1), high energy discharge (D2), or thermal defect among electrical defects (E). Whether (T) is the first thermal defect (t <300 ° C) (T1), the second thermal defect (300 ° C <t <700 ° C) (T2), or the third thermal defect (t> 700 ° C) (T3) Determine the cognition. In this case, the two embodiments may be performed in parallel. Therefore, the internal defect may be determined using the selected X-Y plan view of the first and second X-Y plan views.

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 and 2B are first and second X-Y top views according to the present invention.

2A and 2B show the CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 as X-axis and Y-axis, respectively, for a plurality of inlet transformers whose types of internal defects are known. Internal defects are shown in the first and second XY plan views. In this embodiment, for example, the composition ratio of the corresponding oil in gas to the contents of the accident (internal defect types) is analyzed for a plurality of inflow transformers (internally known defects) in which internal defects occur while driving in actual sites. Doing.

Specifically, in FIG. 2A, CH4 / H2 and C2H2 / CH4 are X-axis and Y-axis, respectively, and the range is set to 1.0 × 10 ⁻⁶ to 1.0 × 0 ⁶ , respectively. For example, reference A denotes a case where the CH 4 / H 2 of the specific inlet transformer is 1.0 × 10 ⁴ and the C 2 H 2 / CH 4 is 1.0 × 10 ⁻² . As described above, if CH4 / H2 to C2H2 / CH4 are represented 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 thermal defects (T) or partial discharges (PD) among electrical defects (E) or energy discharges (D1, D2). Looking at the range of CH4 / H2-C2H2 / CH4 for each internal defect determined in the first XY plan view of the present embodiment are shown in Table 1 below.

division
(First XY plane) Condition 1 Condition 2 X (CH4 / H2) Y (C2H2 / CH4) Thermal 2 <X 0.3 <Y 0.01 <Y≤ 0.3 1 <X Y ≤ 0.01 PD X ≤ 1 Y ≤ 0.01 D1 & D2 X ≤ 2 0.3 <Y

2B shows C2H4 / C2H6 and C2H2 / C2H4 as X-axis and Y-axis, respectively, and the range is set to ^{1.0x10 -6} to 1.0x10 ⁶ , respectively. Also, in FIG. 2B, the defect area is determined by classifying the type of internal defect from the values shown in the second XY plan view. Looking at the range of each oil-in-oil composition ratio for each internal defect determined in the second XY plan view according to this embodiment is shown in Table 2 below. In the second XY plane of FIG. 2B, it is determined whether the thermal fault or the electrical fault E is a partial discharge PD or an energy discharge D1, D2.

division
(2nd XY plane) Condition 1 Condition 2 X (C2H4 / C2H6) Y (C2H2 / C2H4) PD X≤ 0.04 0.04 <X≤ 0.5 0.65 <Y D1 0.5 <X≤ 1.5 0.65 <Y 1.5 <X 2.5 <Y D2 1.5 <X 0.65 <Y≤ 2.5 T1 0.04 <X≤ 1.7 0.00025 <Y≤ 0.01 0.04 <X≤ 0.8 0.01 <Y≤ 0.65 T2 1.7 <X≤ 4 0.0005 <Y≤ 0.01 0.8 <X≤ 4 0.01 <Y≤ 0.65 0.04 <X≤ 4 0.00005 <Y≤ 0.00025 T3 0.04 <X≤ 4 Y≤ 0.00005 1.7 <X≤ 4 0.00025 <Y≤ 0.0005 4 <X Y≤ 0.65

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, the defect regions corresponding to the first and second XY planarities are determined by using CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 calculated in the diagnostic inflow transformer as x, y coordinates, respectively, and the defective region. This is to determine the internal defect from.

3 is a flowchart illustrating a process of setting the first and second X-Y planes according to the present invention.

Referring to FIG. 3, the oil-in-oil gas contained in the insulating oil is detected for each of a plurality of inlet transformers having known types of internal defects (S101). H2, CH4, C2H2, C2H6 and C2H4 are extracted from the detected oil in gas and the amount thereof is measured (S103). The composition ratios CH4 / H2, C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 are respectively calculated from the oil-in-water gases extracted in this way (S105). Thereafter, the first and second X-Y plan views are respectively set using the calculated plurality of composition ratios.

First, the process of setting the first X-Y plan view will be described. CH4 / H2 and C2H2 / CH4 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 respectively (S107). The entire area of the first XY plane is divided into a thermal defect (T) region, a partial discharge (PD) region, and an energy discharge (D1, D2) region of the electrical defect (E) by using the first x, y coordinate of. (S109).

Subsequently, C2H4 / C2H6 and C2H2 / C2H4 values, which are represented by types of internal defects, are set on the second XY plane using the second x, y coordinates (S111), and the plurality of second x, y coordinates are used. The entire region of the second XY plane is the partial discharge PD region, the low energy discharge D1 region, the high energy discharge D2 region of the electrical defect E, and the first thermal defect t1 of the thermal defect T. 300 ° C.) (T1) region, second thermal defect (300 ° C. <t <700 ° C.) (T2) region, and third thermal defect (t> 700 ° C.) (T3) region (S113).

As described above, the first and second XY plan views obtain a composition ratio between selected oil in gas among the five oil in oils extracted from a plurality of inflow transformers whose types of internal defects are known. It can be set on to distinguish each defect area. These first and second 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 for diagnosing internal defects of the inflow transformer according to the present invention, any one of CH4 / H2 and C2H2 / CH4 or optionally C2H4 / C2H6 and C2H2 / C2H4 is selected for the diagnostic inflow transformer to diagnose the internal defect. It is used to determine whether the partial discharge (PD), low energy discharge (D1) or high energy discharge (D2) of the electrical defect (E), or the first thermal defect (t <300 ℃) of the thermal defect (T) ( T1), the second thermal defect (t> 300 ° C) (T2) or the third thermal defect (t> 700 ° C) (T3) is determined.

5 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer using a gas in oil composition ratio 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 in the inflow transformer 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). The composition ratios CH 4 / H 2, C 2 H 2 / CH 4, C 2 H 4 / C 2 H 6, and C 2 H 2 / C 2 H 4 of the selected oil in gas among the extracted five components of oil are calculated (S205). Thereafter, internal defects of the corresponding diagnostic inflow transformer are determined using the calculated CH 4 / H 2, C 2 H 2 / CH 4, and C 2 H 4 / C 2 H 6, and C 2 H 2 / C 2 H 4 (S207). Here, in the internal defect determination step of S207, a region corresponding to the values of CH4 / H2 and C2H2 / CH4 is determined from the defect regions divided in the first XY plane, and the thermal defects T and the electrical defects are determined using the determined regions. E) Partial discharge (PD), energy discharge (D1, D2) to determine.

In addition, a region corresponding to the values of C2H4 / C2H6 and C2H2 / C2H4 is determined in the defect region divided in the second XY plane, and the partial discharge (PD) and the low energy discharge among the electrical defects (E) are determined using the determined region. (D1), high energy discharge (D2), the first thermal defect (t <300 ℃) (T1), the second thermal defect (300 ℃ <t <700 ℃), the third thermal defect of the thermal defect (T) (t> 700 ° C.) (T3) is judged. In this case, the internal defect determination using the first and second XY planes may be performed in parallel. Therefore, the internal defect may be determined using at least one XY plan view selected from the first and second 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 composition ratio calculation unit
13: database (DB) 14: control unit

Claims (8)

In the internal fault diagnosis method of the inlet transformer for extracting and analyzing the oil in the gas in the diagnostic inlet transformer to diagnose the internal defects to diagnose the internal defects,
A first step of calculating CH 4 / H 2 and C 2 H 2 / CH 4 from the extracted oil gas; And
Corresponding to the calculated CH4 / H2 and C2H2 / CH4 with a predetermined internal defect region, whether the internal defect is a thermal defect (T) or a partial discharge (PD) among electrical defects (E) or an energy discharge (D1, D2). A second step of determining cognition; 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,
For each of the inlet transformers whose internal defects are known, CH4 / H2 and C2H2 / CH4, which are represented by thermal defects (T) and partial discharges (PD) and energy discharges (D1 and D2) among electrical defects (E), respectively, setting on the first XY plane in advance as y coordinates; And
The entire area of the first XY plane is converted into a thermal defect (T) region, a partial discharge (PD) region, and an energy discharge (D1, D2) region among the electrical defects (E) using the set plurality of x, y coordinates. Distinguishing; Lt; / RTI &gt;
Oil-induced determination of thermal defect (T), partial discharge (PD) or energy discharge (D1, D2) using the area corresponding to the x, y coordinates for CH4 / H2 and C2H2 / CH4 calculated in the first step A method for diagnosing internal defects of the inlet transformer through the gas composition ratio. In the internal fault diagnosis method of the inlet transformer for extracting and analyzing the oil in the gas in the diagnostic inlet transformer to diagnose the internal defects to diagnose the internal defects,
A first step of calculating C2H4 / C2H6 and C2H2 / C2H4 from the extracted oil gas; And
Using the calculated C2H4 / C2H6 and C2H2 / C2H4, the internal defect is a partial discharge (PD), a low energy discharge (D1), a high energy discharge (D2), or a thermal defect (T) among electrical defects (E). Whether the first thermal defect (t <300 ° C) (T1), the second thermal defect (300 ° C <t <700 ° C) (T2), the third thermal defect (t> 700 ° C) (T3) A second step of doing; Internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio comprising a. The method of claim 3, wherein the second step,
For each of the inflow transformers having known types of internal defects, the first thermal defects (t <300) among partial discharge (PD), low energy discharge (D1), high energy discharge (D2), and thermal defect (T) among electrical defects (E). C2H4 / C2H6 and C2H2 / C2H4 which are represented by (T1), the second thermal defect (300 ° C <t <700 ° C) (T2), and the third thermal defect (t> 700 ° C) (T3), respectively. Setting on the second XY plane in advance as coordinates; And
A partial discharge (PD) area, a low energy discharge (D2) area, a high energy discharge (D3) area, and a first thermal defect (T1) area are defined in the entire area of the second XY plane using the set plurality of x and y coordinates. Dividing the second thermal defect (T2) region into a third thermal defect (T3) region; Lt; / RTI &gt;
The partial discharge (PD), the low energy discharge (D2), the high energy discharge (D3), and the first thermal heat by using a region corresponding to the x, y coordinates for C2H4 / C2H6 and C2H2 / C2H4 calculated in the first step. A method for diagnosing internal defects of an inlet transformer through a gas-in-oil composition ratio for determining defects (T1), second thermal defects (T2), and third thermal defects (T3). A first step of collecting oil in gas for each of the inflow transformers having known types of internal defects and calculating CH 4 / H 2 and C 2 H 2 / CH 4 from the collected oil gas;
Among the internal defects, thermal defects T and CH4 / H2 and C2H2 / CH4 appearing for each of the partial discharge PD and the energy discharge D1 and D2 among the electrical defects E are x, y coordinates, respectively. The entire area of the first XY plane is divided into a thermal defect (T) region, a partial discharge (PD) region, and an energy discharge (D1, D2) region by setting on an XY plane and using the set multiple x, y coordinates. A second step of doing;
Extracting oil-in-oil gas from the insulating oil of the inflow transformer for diagnosing internal defects, and calculating CH 4 / H 2 and C 2 H 2 / CH 4 from the oil-in-gas; And
Determine the x, y coordinates consisting of CH4 / H2 and C2H2 / CH4 calculated in the third step in the first XY plane and whether the internal defect of the diagnostic inlet transformer from the determined area is a thermal defect (T), partial discharge Determining whether it is PD or energy discharge (D1, D2); Internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio comprising a.
The method of claim 5,
The thermally defective regions of the entire region of the first XY plane are 2 <CH4 / H2 and 0.3 <C2H2 / CH4 or 0.01 <C2H2 / CH4≤0.3 or 1 <CH4 / H2 and C2H2 / CH4≤0.01 and the partial discharge ( PD) areas are CH4 / H2≤1 and C2H2 / CH4≤0.01 and the energy discharge (D1, D2) areas are CH4 / H2≤2 and 0.3 <C2H2 / CH4. Diagnostic method. A first step of extracting gas in oil for each of a plurality of inflow transformers having known types of internal defects, and calculating C2H4 / C2H6 and C2H2 / C2H4 from the collected oil gas;
The first thermal defect (t <300 ° C.) T1 of the partial discharge PD, the high energy discharge D1, the low energy discharge D2 and the thermal defect T of the internal defect E 2 x, y coordinates of C2H4 / C2H6 and C2H2 / C2H4 respectively, which are represented by thermal defects (300 ° C <t <700 ° C) (T2) and third thermal defects (t> 700 ° C) (T3), respectively. A partial discharge (PD) area, a low energy discharge (D1) area, a high energy discharge (D2) area, and a first thermal defect (t <) 300 ° C.) a second step of dividing into a T1 region, a second thermal defect (300 ° C. <t <700 ° C.) (T2) region, and a third thermal defect (t> 700 ° C.) T3 region;
Extracting oil-in-oil gas from the insulating oil of the diagnostic inflow transformer for diagnosing internal defects, and calculating C2H4 / C2H6 and C2H2 / C2H4 from the oil-in-gas; And
Determine the x, y coordinates composed of C2H4 / C2H6 and C2H2 / C2H4 calculated in the third step in the second XY plane and whether the internal defect of the diagnostic inlet transformer from the determined area is partial discharge (PD), low energy discharge Whether it is (D1), high energy discharge (D2), first thermal defect (t <300 ° C) (T1), second thermal defect (300 ° C <t <700 ° C) (T2) or third thermal defect a fourth step of determining whether or not (t> 700 ° C.) (T3); Internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio comprising a. The method of claim 7, wherein
The partial discharge (PD) region of the entire region of the second XY plane is C2H4 / C2H6≤0.04 or 0.04 <C2H4 / C2H6≤0.5 and 0.65 <C2H2 / C2H4, and the low energy discharge (D1) region is 0.5 <C2H4 / C2H6≤1.5 and 0.65 <C2H2 / C2H4 or 1.5 <C2H4 / C2H6 and 2.5 <C2H2 / C2H4, and the high energy discharge (D2) region is 1.5 <C2H4 / C2H6 and 0.65 <C2H2 / C2H4≤2.5 and the first thermal Defective regions are 0.04 <C2H4 / C2H6≤1.7 and 0.00025 <C2H2 / C2H4≤0.01 or 0.04 <C2H4 / C2H6≤0.8 and 0.01 <C2H2 / C2H4≤0.65, and the second thermal defect region is 1.7 <C2H4 / C2H6≤4 And 0.0005 <C2H2 / C2H4≤0.01 or 0.8 <C2H4 / C2H6≤4 and 0.01 <C2H2 / C2H4≤0.65 or 0.04 <C2H4 / C2H6≤4 and 0.00005 <C2H2 / C2H4≤0.00025, wherein the third thermally defective region is 0.04 Inlet transformer with oil in gas composition ratio of <C2H4 / C2H6≤4 and C2H2 / C2H4≤0.00005 or 1.7 <C2H4 / C2H6≤4 and 0.00025 <C2H2 / C2H4≤0.0005 or 4 <C2H4 / C2H6 and C2H2 / C2H4≤0.65 How to diagnose internal defects.

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