WO2013100591A1 - 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법 - Google Patents
유중가스 조성비를 통한 유입변압기의 내부결함 진단방법 Download PDFInfo
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- WO2013100591A1 WO2013100591A1 PCT/KR2012/011504 KR2012011504W WO2013100591A1 WO 2013100591 A1 WO2013100591 A1 WO 2013100591A1 KR 2012011504 W KR2012011504 W KR 2012011504W WO 2013100591 A1 WO2013100591 A1 WO 2013100591A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2841—Gas in oils, e.g. hydrogen in insulating oils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/202—Constituents thereof
- G01N33/2022—Non-metallic constituents
- G01N33/2025—Gaseous constituents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
- G01V9/007—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00 by detecting gases or particles representative of underground layers at or near the surface
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
Definitions
- 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.
- 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).
- 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.
- 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.
- the conventional inlet transformer internal fault diagnosis method has the following problems.
- 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.
- 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.
- 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.
- 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.
- 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.
- a method for diagnosing internal defects of an inlet transformer for diagnosing 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.
- 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.
- the third step may include C2H2 / C2H4 and C2H4 / C2H6 that appear by 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.
- PD partial discharge
- D1 low energy discharge
- D2 high energy discharge
- the first thermal defect (t ⁇ 300 ° C.) (T1) is calculated using the calculated C2H4 / C2H6 and C2H4 / CH4.
- 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.
- 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.
- 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.
- 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.
- 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.
- the method for diagnosing internal defects of the inflow transformer through the oil-in-oil composition ratio is to collect the oil-in-oil gas by a plurality of inflow transformers whose types of internal defects are known, and the composition ratio CH4 / H2, C2H2 / C2H4.
- 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.
- E electrical defect
- T thermal defect
- 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.
- 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)
- 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.
- 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.
- 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.
- PD partial discharge
- D1 low energy discharge
- D2 high energy discharge
- 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.).
- 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).
- 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
- 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.
- 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.
- 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
- 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.
- 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.
- the inflow transformer internal defect diagnosis method through the oil-in-oil composition ratio according to the second embodiment of the present invention the inflow to extract the oil and gas in the diagnostic inlet transformer for diagnosing the internal defect to diagnose the internal defect
- a method for diagnosing internal defects of a transformer 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.
- 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.
- 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.
- the internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio by extracting and analyzing the oil in the gas in the diagnostic inlet transformer to diagnose the internal defect to diagnose the internal defect
- a method for diagnosing internal defects of an inlet transformer comprising: calculating first C2H4 / C2H6 and C2H2 / C2H4 in the extracted oil gas; And using the calculated C2H4 / C2H6 and C2H2 / C2H4, 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.
- 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)
- T1 1 thermal defect
- T2 second thermal defect
- T3 third thermal defect
- PD partial discharge
- D2 low energy discharge
- D3 high energy discharge
- the first thermal defect T1, the second thermal defect T2, and the third thermal defect T3 are determined.
- the internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio according to another aspect of the second embodiment of the present invention, the oil-in-water gas for each of a plurality of inlet transformers of known types of internal defects are collected and A first step of calculating CH 4 / H 2 and C 2 H 2 / CH 4, respectively; 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.
- 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.
- the internal fault diagnosis method of the inlet transformer through the oil-in-oil composition ratio according to another aspect of the second embodiment of the present invention, the oil-in-water gas for each of a plurality of inlet transformers of known types of internal defects are collected and A first step of calculating C2H4 / C2H6 and C2H2 / C2H4, respectively; 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 °C) (T1) of the thermal defects, the second thermal defect (300 °C) 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
- PD partial discharge
- first thermal defect t ⁇ 300 ° C
- second thermal defect 300 ° C ⁇ t ⁇ 700 ° C
- third thermal a fourth step of determining whether it is a defect (t> 700 ° C.) T3.
- the rate of erroneous diagnosis of internal defects of the inlet transformer can be reduced.
- 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.
- FIG. 1 is a block diagram of the internal fault diagnosis apparatus of the inlet transformer to which the present invention is applied.
- 2 to 5 are first to fourth X-Y plan views according to the first embodiment of the present invention.
- FIG. 6 is a flowchart showing a process of setting the first to fourth X-Y plan views according to the first embodiment of the present invention.
- Figure 7 is a schematic diagram of the internal fault diagnosis process of the inlet transformer according to the first embodiment of the present invention.
- FIG. 8 is a flowchart showing a method for diagnosing internal defects of an inlet transformer through a gas in oil composition ratio according to a second embodiment of the present invention.
- 9 and 10 are fifth and sixth X-Y top views according to a second embodiment of the present invention.
- FIG. 11 is a flowchart showing a process of setting fifth and sixth X-Y top views according to a second embodiment of the present invention.
- FIG. 12 is a schematic diagram of the internal fault diagnosis process of the inlet transformer according to the second embodiment of the present invention.
- FIG. 13 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer through a gas in oil composition ratio according to a second embodiment of the present invention
- FIG. 1 is a block diagram of an internal fault diagnosis apparatus of an inlet transformer to which the present invention is applied.
- 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.
- 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. .
- CH4 and C2H6 are classified as low temperature defects
- C2H4 is classified as high temperature defects
- H2 is classified as low energy discharge
- 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.
- 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. More specifically, in the first embodiment of the present invention, the database (DB) 13 has a first XY planar view, C2H2 / C2H4 and C2H4 / C2H6, which is composed of CH4 / H2 and C2H2 / C2H4 as X and Y axes, respectively.
- 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.
- the four XY plans detect the CH4 / H2, C2H2 / C2H4, C2H4 / C2H6 and C2H4 / CH4 values for each of the inlet transformers having known types of internal defects 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, and each of the plurality of The x, y coordinates are used to classify the area by type of internal defect.
- the database (DB) 13 is X in the fifth XY planar view, C2H4 / C2H6 and C2H2 / C2H4, each of which uses CH4 / H2 and C2H2 / CH4 as X and Y axes, respectively.
- the sixth XY plan view made up of the axes and the Y axis and various data related to these plan views are stored. For example, the defect area is classified according to the type of internal defect.
- 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.
- the two XY plan views are CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 calculated from five oil-in-oil gases H2, CH4, C2H2, C2H4, and C2H6 detected for each of the inlet transformers whose types of internal defects are known.
- the control unit 14 is CH4 / H2 and C2H2 / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4, C2H2 / respectively calculated for the diagnostic inlet transformer to determine the internal defect in the first embodiment Use C2H4 and C2H4 / C2H6 to determine the internal fault of the corresponding diagnostic inlet transformer.
- control unit 14 is the composition ratio CH4 / H2 and C2H2 / C2H4, C2H2 / C2H4 and C2H4 / C2H6, C2H4 / C2H6 and C2H4 / CH4 And C2H2 / C2H4 and C2H4 / C2H6 as x and y coordinates, respectively, to determine which defect area in the first to fourth XY planes of each of the x and y coordinates stored in the database (DB) 13 is finally determined. To determine the internal defect.
- the controller 14 determines whether the internal defect is an electrical defect (E) or a thermal defect (T) by using CH4 / H2 and C2H2 / C2H4. If the determination result is C2H2 / C2H4, And C2H4 / C2H6 to determine whether partial discharge (PD), low energy discharge (D1) or high energy discharge (D2).
- E electrical defect
- T thermal defect
- T thermal defect
- control unit 14 uses the 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 in the second embodiment, respectively.
- the control unit 14 of the second embodiment of the present invention x, y respectively the composition ratio of the oil in gas detected by the diagnostic inlet transformer, that is, CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4, respectively
- the coordinates it is determined whether each of the x and y coordinates corresponds to which defect area in the fifth and sixth XY planes stored in the database (DB) 13 to finally determine the corresponding internal defect. More specifically, CH4 / H2 and C2H2 / CH4 may be used 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).
- the internal defect is a partial discharge (PD), a low energy discharge (D1), a high energy discharge (D2), or a thermal defect (T) of the electrical defect (E). It is determined whether 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). It may be. At this time, these two determination process may be performed in parallel. Therefore, the internal defect may be determined using the X-Y plan view selected from among the fifth and sixth X-Y plan views.
- 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.
- a diagnostic inflow transformer is an inflow transformer for diagnosing an internal defect using the X-Y plan view.
- 2 to 5 are plan views of the first to fourth X-Ys according to the first embodiment of the present invention.
- 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.
- the content ratio of the respective oil-in-oil gas to the contents of the accident is analyzed for a plurality of inflow transformers that have internal defects while operating in actual sites.
- 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.
- 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.
- the first XY plan view of FIG. the defect area is determined by dividing the values shown in the first XY plan view of FIG.
- 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.
- FIG. 3 shows C2H2 / C2H4 and C2H4 / C2H6,
- FIG. 4 shows C2H4 / C2H6 and C2H4 / CH4,
- FIG. 5 shows C2H2 / C2H4 and C2H4 / C2H6 as X-axis and Y-axis, respectively, and the range is 1.0 ⁇ 10. It is set to -6 to 1.0 ⁇ 10 6 . 3 to 5, 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.
- the partial discharge PD, the low energy discharge D1, and the high energy discharge D2 among the electrical defects E are determined.
- 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
- 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 X-Y 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 in the diagnostic inlet transformer, respectively, as first and second coordinates.
- the defect area corresponding to the fourth XY plan view is determined, and the internal defect is determined from the defect area.
- FIG. 6 is a flowchart illustrating a process of setting the first to fourth X-Y plan views according to the first embodiment of the present invention.
- the water-in-oil gas is detected for each of a plurality of inflow transformers whose types of internal defects are known according to the first embodiment of the present invention (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.
- 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).
- 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).
- 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 set plurality of third x and y coordinates are used.
- 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).
- 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.
- FIG. 7 is a schematic diagram illustrating an internal fault diagnosis process of the inlet transformer according to the first embodiment of the present invention.
- an electrical defect (E) is preferentially used by using CH4 / H2 and C2H2 / C2H4 for the diagnostic inflow transformer for diagnosing the internal defect.
- thermal defect T first.
- 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).
- 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).
- T1 the first thermal defect
- T2H4 / C2H6 and C2H4 / CH4 T2H4 / CH4
- T3 the third thermal bond
- FIG. 8 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer according to a first embodiment of the present invention.
- the oil in the oil contained in the insulating oil of 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).
- 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 are determined using the calculated CH 4 / H 2 and C 2 H 2 / C 2 H 4, C 2 H 2 / C 2 H 4 and C 2 H 4 / C 2 H 6, C 2 H 4 / C 2 H 6 and C 2 H 4 / CH 4, C 2 H 2 / C 2 H 4 and C 2 H 4 / C 2 H 6. .
- 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) 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.
- 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).
- 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.
- T2 ⁇ t ⁇ 700 ° C.
- T3 the third thermal bond (t> 700 ° C.)
- 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).
- the first embodiment of the present invention to accurately diagnose the internal defect of the inlet transformer using the composition ratio of the gas in the gas generated when the internal defect of the inlet transformer.
- 9 and 10 are fifth and sixth X-Y top views according to the second embodiment of the present invention.
- 9 and 10 are X-axis and Y-axis for CH4 / H2 and C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4, respectively, for a plurality of inflow transformers of known types of internal defects according to the second embodiment of the present invention.
- the internal defects according to the composition ratio of the oil in gas are shown in the fifth and sixth XY plan views.
- the composition ratio of the corresponding oil in gas to the contents of the accident is analyzed for a plurality of inflow transformers (internally known defects) in which internal defects occur while driving in actual sites. Doing.
- 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.
- 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 .
- CH4 / H2 to C2H2 / CH4 are represented for each of the plurality of inflow transformers, they are shown as a fifth XY plan view of FIG.
- the defect area is determined by dividing the values shown in the fifth XY plan view of FIG.
- 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 fifth XY plan view of the present embodiment is shown in Table 5.
- C2H4 / C2H6 and C2H2 / C2H4 are X-axis and Y-axis, respectively, and the range is set to 1.0x10 -6 to 1.0x10 6 , respectively.
- the defect area is determined by classifying the type of internal defect from the values shown in the sixth XY plan view. Looking at the range of each oil-in-oil composition ratio for each internal defect determined in the sixth XY plan view according to this embodiment is shown in Table 6. In the sixth XY plane of FIG. 10, it is determined whether the thermal fault (T) or the electrical fault (E) is a partial discharge (PD) or an energy discharge (D1, D2).
- 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 fifth and sixth X-Y planes. That is, the defect area corresponding to the fifth and sixth XY planarities is 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 area. This is to determine the internal defect from.
- FIG. 11 is a flowchart illustrating a process of setting fifth and sixth X-Y plan views according to the second exemplary embodiment of the present invention.
- the oil in the oil contained in the insulating oil is detected for each of a plurality of inlet transformers whose types of internal defects are known (S301).
- H2, CH4, C2H2, C2H6 and C2H4 are extracted from the detected oil in gas and the amount thereof is measured (S303).
- the composition ratios CH4 / H2, C2H2 / CH4, C2H4 / C2H6 and C2H2 / C2H4 are respectively calculated from the oil-in-water gases of the five components thus extracted (S305).
- the fifth and sixth X-Y plan views are respectively set using the calculated plurality of composition ratios.
- CH4 / H2 and C2H2 / CH4 values appearing for each inlet transformer whose internal defects are known for each internal defect type are set in the fifth XY plane using fifth x, y coordinates (S307), and the set multiples
- the entire area of the fifth 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 a fifth x, y coordinate of. (S309).
- the C2H4 / C2H6 and C2H2 / C2H4 values appearing according to the types of internal defects are set on the sixth XY plane using sixth x, y coordinates (S311), and the plurality of sixth x, y coordinates are used.
- the entire region of the sixth 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 (S313).
- the fifth and sixth 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, and the values of these composition ratios as x, y coordinates, respectively, in the XY plane. It can be set on to distinguish each defect area. These fifth and sixth plan views are then used to determine the internal defect of the diagnostic inflow transformer for which the internal defect is to be diagnosed.
- FIG. 12 is a schematic diagram illustrating an internal fault diagnosis process of an inlet transformer according to a second exemplary embodiment of the present invention.
- FIG. 13 is a flowchart illustrating a method for diagnosing internal defects of an inlet transformer through a gas in oil composition ratio according to a second embodiment of the present invention.
- the oil in the oil contained in the insulating oil in the inflow transformer for diagnosing the internal defect is detected (S401).
- H2, CH4, C2H2, C2H4 and C2H6 are extracted from the detected oil in gas and the amount of gas is measured (S403).
- 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 the oil in the extracted five components of the gas (S405).
- the areas corresponding to the values of C2H4 / C2H6 and C2H2 / C2H4 are determined in the defect areas divided in the sixth XY plane, and the partial discharge (PD) and the low energy discharge among the electrical defects (E) are determined using the determined areas.
- (D1), high energy discharge (D2), the first thermal defect (t ⁇ 300 °C) (T1), the second thermal defect (300 °C ⁇ t ⁇ 700 °C), the third thermal defect of the thermal defect (T) (t> 700 ° C.) (T3) is judged.
- the internal defect determination using the fifth and sixth X-Y top views may be performed in parallel. Therefore, the internal defect may be determined using at least one X-Y plan view selected from the fifth and sixth X-Y plan views.
- 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.
- the present invention can accurately diagnose internal defects by collecting and analyzing the gaseous gas contained in the insulating oil in the inlet transformer, so that the present invention can be very useful not only in the inlet transformer manufacturing but also in substations and power companies that apply it in the field. Can be.
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Description
| 구분(제1X-Y평면) | 조건1 | 조건2 | ||
| 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 |
| 구분(제2X-Y평면) | 조건1 | 조건2 | 조건3 | |||
| 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 | ||||
| 구분(제3X-Y평면) | 조건1 | 조건2 | ||
| 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 | |
| 구분(제3X-Y평면) | 조건1 | 조건2 | 조건3 | |||
| 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 | |
| 구분(제1 X-Y평면) | 조건1 | 조건2 |
| 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 |
| 구분(제2 X-Y평면) | 조건1 | 조건2 |
| 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 |
Claims (23)
- 내부결함을 진단하고자 하는 진단용 유입변압기로부터 유중가스를 추출 및 분석하여 그 내부결함을 진단하는 유입변압기의 내부결함 진단방법에 있어서,상기 추출된 유중가스 중 CH4/H2, C2H2/C2H4, C2H4/C2H6 및 C2H4/CH4의 조성비를 각각 계산하는 제1단계;상기 계산된 CH4/H2 및 C2H2/C2H4를 미리 설정된 내부결함 영역에 대응하여 내부결함이 전기적 결함(E)인지 또는 열적 결함(T)인지를 판단하는 제2단계; 및상기 제2단계의 판단결과 상기 전기적 결함(E)이면 상기 계산된 C2H2/C2H4 및 C2H4/C2H6을 미리 설정된 내부결함 영역에 대응하여 부분방전(PD)인지, 저에너지방전(D1)인지 또는 고에너지방전(D2)인지를 판단하는 제3단계; 를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제1항에 있어서, 상기 제2단계는,내부결함의 종류가 알려진 다수의 유입변압기마다 전기적 결함 및 열적 결함별로 나타나는 CH4/H2 및 C2H2/C2H4를 각각 x,y 좌표로 하여 제1 X-Y 평면상에 미리 설정하는 단계; 및상기 설정된 다수의 x,y 좌표를 이용하여 상기 제1 X-Y 평면의 전체 영역을 전기적 결함(E) 영역 및 열적 결함(T) 영역으로 구분하는 단계; 를 포함하고,상기 제1단계에서 계산된 CH4/H2 및 C2H2/C2H4에 대한 x,y 좌표에 대응하는 영역을 이용하여 상기 전기적 결함(T) 또는 열적 결함(E)을 판단하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제1항에 있어서, 상기 제3단계는,전기적 결함이 발생한 다수의 유입변압기마다 부분방전(PD), 고에너지방전(D1) 및 저에너지방전(D2)별로 나타나는 C2H2/C2H4 및 C2H4/C2H6를 각각 x,y 좌표로 하여 제2 X-Y 평면상에 미리 설정하는 단계; 및상기 설정된 다수의 x,y 좌표를 이용하여 상기 제2 X-Y 평면의 전체 영역을 부분방전(PD) 영역, 저에너지방전(D1) 영역 및 고에너지방전(D2) 영역으로 구분하는 단계; 를 포함하고,상기 제1단계에서 계산된 C2H2/C2H4 및 C2H4/C2H6에 대한 x,y 좌표에 대응하는 영역을 이용하여 부분방전(PD), 저에너지방전(D1) 또는 고에너지방전(D2)을 판단하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제1항에 있어서,상기 제2단계의 판단결과 상기 열적 결함(T)이면 상기 계산된 C2H4/C2H6 및 C2H4/CH4를 이용하여 제1 열적결함(t<300℃)(T1)인지, 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3)인지를 판단하는 제4단계; 및상기 제4단계의 판단결과 상기 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3)이면 더 구체적으로 상기 C2H2/C2H4 및 C2H4/C2H6를 이용하여 제2 열적결함(300℃<t<700℃)(T2)인지 아니면 제3 열적결함(t>700℃)(T3)인지를 판단하는 제5단계; 를 더 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제4항에 있어서, 상기 제4단계는,열적 결함이 발생한 다수의 유입변압기마다 상기 제1 열적결함(t<300℃) 및 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3)별로 나타나는 C2H4/C2H6 및 C2H4/CH4를 각각 x,y 좌표로 하여 제3 X-Y 평면상에 미리 설정하는 단계; 및상기 설정된 x,y 좌표를 이용하여 상기 제3 X-Y 평면의 전체영역을 제1 열적결함(T1) 영역 및 제2 또는 제3 열적결함 영역으로 구분하는 단계; 를 포함하고,상기 제1단계에서 계산된 C2H4/C2H6 및 C2H4/CH4에 대한 x,y 좌표에 대응하는 영역을 이용하여 상기 제1 열적 결함(T1) 또는 제2 또는 제3 열적 결함을 판단하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제5항에 있어서, 상기 제5단계는,상기 내부결함의 종류가 알려진 다수의 유입변압기마다 상기 제2 열적결함(300℃<t<700℃)(T2) 및 제3 열적결함(t>700℃)(T3)별로 나타나는 C2H2/C2H4 및 C2H4/C2H6를 각각 x,y 좌표로 하여 제4 X-Y 평면상에 미리 설정하는 단계; 및상기 설정된 다수의 x,y 좌표를 이용하여 제4 X-Y 평면의 전체영역을 제2 열적결함(T2) 영역 및 제3 열적결함(T3) 영역으로 구분하는 단계; 를 포함하고,상기 제1단계에서 계산된 C2H2/C2H4 및 C2H4/C2H6에 대한 x,y 좌표에 대응하는 영역을 이용하여 제2 열적결함(T2) 또는 제3 열적결함(T3)을 판단하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 내부결함의 종류가 알려진 다수의 유입변압기별로 유중가스를 채취하여 이들의 조성비 CH4/H2, C2H2/C2H4, C2H4/C2H6 및 C2H4/CH4를 각각 계산하는 제1단계;상기 내부결함 중 전기적 결함(E) 및 열적 결함(T)별로 나타나는 CH4/H2 및 C2H2/C2H4를 각각 x,y 좌표로 하여 제1 X-Y 평면상에 설정하고 상기 설정된 다수의 x,y 좌표를 이용하여 상기 제1 X-Y 평면의 전체 영역을 전기적 결함(E) 영역 및 열적 결함(T) 영역으로 구분하는 제2단계;상기 전기적 결함 중 부분방전(PD), 저에너지방전(D1) 및 고에너지방전(D2)별로 나타나는 C2H2/C2H4 및 C2H4/C2H6를 각각 x,y 좌표로 하여 제2 X-Y 평면상에 설정하고 상기 설정된 다수의 x,y 좌표를 이용하여 상기 제2 X-Y 평면의 전체 영역을 부분방전(PD) 영역, 저에너지방전(D1) 영역 및 고에너지방전(D2) 영역으로 구분하는 제3단계;상기 열적 결함(T) 중 제1 열적결함(t<300℃)(T1) 및 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3)별로 나타나는 C2H4/C2H6 및 C2H4/CH4를 각각 x,y 좌표로 하여 제3 X-Y 평면상에 설정하고 상기 설정된 다수의 x,y 좌표를 이용하여 상기 제3 X-Y 평면의 전체 영역을 제1 열적결함(T1) 영역 및 제2 또는 제3 열적결함(T2&T3) 영역으로 구분하는 제4단계;상기 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3) 중 제2 열적결함(300℃<t<700℃)(T2) 및 제3 열적결함(t>700℃)(T3)별로 나타나는 C2H2/C2H4 및 C2H4/C2H6를 각각 x,y 좌표로 하여 제4 X-Y 평면상에 표시하고 상기 설정된 다수의 x,y 좌표를 이용하여 상기 제4 X-Y 평면의 전체 영역을 제2 열적결함(T2) 영역 및 제3 열적결함(T3) 영역으로 구분하는 제5단계;내부결함을 진단하고자 하는 진단용 유입변압기로부터 유중가스를 추출하여 CH4/H2, C2H2/C2H4, C2H4/C2H6 및 C2H4/CH4의 조성비를 각각 계산하는 제6단계; 및상기 계산된 CH4/H2, C2H2/C2H4, C2H4/C2H6 및 C2H4/CH4 중 선택된 2개로 이루어진 x,y 좌표에 대응하는 영역을 상기 제1 내지 제4 X-Y 평면에서 각각 결정하고 상기 결정된 영역으로부터 상기 진단용 유입변압기의 내부결함 종류를 판단하는 제7단계; 를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제7항에 있어서, 상기 제7단계는,상기 제6단계에서 계산된 CH4/H2 및 C2H2/C2H4에 대한 x,y 좌표에 대응하는 영역을 상기 제1 X-Y 평면에서 결정하고 상기 결정된 영역을 이용하여 전기적 결함(E)인지 또는 열적 결함(T)인지를 판단하는 단계를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제8항에 있어서, 상기 제7단계는,상기 전기적 결함(E)인 것으로 판단되면 상기 제6단계에서 계산된 C2H2/C2H4 및 C2H4/C2H6에 대한 x,y 좌표에 대응하는 영역을 상기 제2 X-Y 평면에서 결정하고 상기 결정된 영역을 이용하여 상기 전기적 결함이 부분방전(PD), 저에너지방전(D1) 또는 고에너지방전(D2)인지를 판단하는 단계를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제8항에 있어서, 상기 제7단계는,상기 열적 결함(T)인 것으로 판단되면 상기 제6단계에서 계산된 C2H4/C2H6 및 C2H4/CH4에 대한 x,y 좌표에 대응하는 영역을 상기 제3 X-Y 평면상에서 결정하고 상기 결정된 영역을 이용하여 상기 열적 결함(T)이 제1 열적결함(t<300℃)(T1)인지, 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3) 열적결함(t>300℃)인지를 판단하는 단계를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제10항에 있어서,상기 제2 열적결함(300℃<t<700℃)(T2) 또는 제3 열적결합(t>700℃)(T3)인 것으로 판단되면 상기 제6단계에서 계산된 C2H2/C2H4 및 C2H4/C2H6에 대한 x,y 좌표에 대응하는 영역을 상기 제4 X-Y 평면상에서 결정하고 상기 결정된 영역을 이용하여 상기 제2 열적결함(300℃<t<700℃)(T2)인지 아니면 제2 열적결함(t>700℃)(T3)인지를 판단하는 단계를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제7항에 있어서,상기 제1 X-Y 평면의 전체 영역 중 상기 전기적 결함 영역은 CH4/H2≤0.05 및 C2H2/C2H4≤0.4의 조건과, CH4/H2≤3 및 C2H2/C2H4>0.4의 조건을 동시에 만족하고, 상기 열적 결함 영역은 CH4/H2>0.05 및 C2H2/C2H4≤0.4의 조건과, CH4/H2>3 및 C2H2/C2H4>0.4인 조건을 동시에 만족하는 것을 특징으로 하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제7항에 있어서,상기 제2 X-Y 평면의 전체영역 중 상기 부분방전(PD) 영역은 C2H2/C2H4≤2 및 C2H4/C2H6≤0.1의 조건을 만족하고, 상기 저에너지방전(D1) 영역은 C2H2/C2H4>2 및 C2H4/C2H6≤1.5의 조건, C2H2/C2H4≤2 및 0.1<C2H4/C2H6≤1.5의 조건 및 C2H2/C2H4>2.5 및 C2H4/C2H6>1.5의 조건을 동시에 만족하며, 상기 고에너지방전(D2) 영역은 C2H2/C2H4≤2.5 및 C2H4/C2H6>1.5의 조건을 만족하는 것을 특징으로 하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제7항에 있어서,상기 제3 X-Y 평면의 전체 영역 중 상기 제1 열적결함(t<300℃)(T1) 영역은 C2H4/C2H6≤0.2 및 C2H4/CH4≤0.2의 조건과, C2H4/C2H6>0.2 및 0.05<C2H4/CH4≤0.2의 조건을 동시에 만족하고, 상기 제2 열적결함((300℃<t<700℃)(T2) 또는 제3 열적결함(t>700℃) 영역은 C2H4/C2H6>0.2 및 C2H4/CH4≤0.05의 조건과, C2H4/CH4>0.2의 조건을 동시에 만족하는 것을 특징으로 하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제7항에 있어서,상기 제4 X-Y 평면의 전체영역 중 상기 제2 열적결함(300℃<t<700℃)(T2) 영역은 C2H2/C2H4>0.0005 및 C2H4/C2H6≤2의 조건과, 0.0005<C2H2/C2H4≤0.02 및 2<C2H4/C2H6≤4.68의 조건을 동시에 만족하고, 상기 제3 열적결함(t>700℃)(T3) 영역은 C2H2/C2H4≤0.0005의 조건과, 0.0005<C2H2/C2H4≤0.02 및 C2H4/C2H6>4.68의 조건과, C2H2/C2H4>0.02 및 C2H4/C2H6>2의 조건을 동시에 만족하는 것을 특징으로 하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 내부결함을 진단하고자 하는 진단용 유입변압기에서 유중가스를 추출 및 분석하여 그 내부결함을 진단하는 유입변압기의 내부결함 진단방법에 있어서,상기 추출된 유중가스로부터 CH4/H2 및 C2H2/CH4를 계산하는 제1단계; 및상기 계산된 CH4/H2 및 C2H2/CH4를 미리 설정된 내부결함 영역과 대응하여 상기 내부결함이 열적 결함(T)인지 또는 전기적 결함(E) 중 부분방전(PD)인지 또는 에너지방전(D1,D2)인지를 판단하는 제2단계; 를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제16항에 있어서, 상기 제2단계는,내부결함의 종류가 알려진 다수의 유입변압기마다 열적 결함(T)과, 전기적 결함(E) 중 부분방전(PD) 및 에너지방전(D1,D2)별로 나타나는 CH4/H2 및 C2H2/CH4를 각각 x,y 좌표로 하여 제5 X-Y 평면상에 미리 설정하는 단계; 및상기 설정된 다수의 x,y 좌표를 이용하여 상기 제5 X-Y 평면의 전체 영역을 열적 결함(T) 영역과, 전기적 결함(E) 중 부분방전(PD) 영역 및 에너지방전(D1,D2) 영역으로 구분하는 단계; 를 포함하고,상기 제1단계에서 계산된 CH4/H2 및 C2H2/CH4에 대한 x,y 좌표에 대응하는 영역을 이용하여 열적 결함(T), 부분방전(PD) 또는 에너지방전(D1,D2)을 판단하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 내부결함을 진단하고자 하는 진단용 유입변압기에서 유중가스를 추출 및 분석하여 그 내부결함을 진단하는 유입변압기의 내부결함 진단방법에 있어서,상기 추출된 유중가스에서 C2H4/C2H6 및 C2H2/C2H4를 계산하는 제1단계; 및상기 계산된 C2H4/C2H6 및 C2H2/C2H4를 이용하여 상기 내부결함이 전기적 결함(E) 중 부분방전(PD)인지, 저에너지방전(D1)인지, 고에너지방전(D2)인지 또는 열적 결함(T) 중 제1 열적결함(t<300℃)(T1)인지, 제2 열적결함(300℃<t<700℃)(T2)인지, 제3 열적결함(t>700℃)(T3)인지를 판단하는 제2단계; 를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제18항에 있어서, 상기 제2단계는,내부결함의 종류가 알려진 다수의 유입변압기마다 전기적 결함(E) 중 부분방전(PD), 저에너지방전(D1), 고에너지방전(D2) 및 열적 결함(T) 중 제1 열적결함(t<300℃)(T1), 제2 열적결함(300℃<t<700℃)(T2), 제3 열적결함(t>700℃)(T3)별로 나타나는 C2H4/C2H6 및 C2H2/C2H4를 각각 x,y 좌표로 하여 제6 X-Y 평면상에 미리 설정하는 단계; 및상기 설정된 다수의 x,y 좌표를 이용하여 상기 제6 X-Y 평면의 전체 영역을 부분방전(PD) 영역, 저에너지방전(D2) 영역, 고에너지방전(D3) 영역, 제1열적결함(T1) 영역, 제2열적결함(T2) 영역, 제3열적결함(T3) 영역으로 구분하는 단계; 를 포함하고,상기 제1단계에서 계산된 C2H4/C2H6 및 C2H2/C2H4에 대한 x,y 좌표에 대응하는 영역을 이용하여 상기 부분방전(PD), 저에너지방전(D2), 고에너지방전(D3), 제1열적결함(T1), 제2열적결함(T2), 제3열적결함(T3)을 판단하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 내부결함의 종류가 알려진 다수의 유입변압기별로 유중가스를 채취하고 상기 채취된 유중가스로부터 CH4/H2 및 C2H2/CH4를 각각 계산하는 제1단계;상기 내부결함 중 열적 결함(T)과, 전기적 결함(E) 중 부분방전(PD) 및 에너지방전(D1,D2)별로 각각 나타나는 CH4/H2 및 C2H2/CH4를 각각 x,y 좌표로 하여 제5 X-Y 평면상에 설정하고 상기 설정된 다수의 x,y 좌표를 이용하여 상기 제5 X-Y 평면의 전체영역을 열적 결함(T) 영역, 부분방전(PD) 영역 및 에너지방전(D1,D2) 영역으로 구분하는 제2단계;내부결함을 진단하고자 하는 진단용 유입변압기의 절연유로부터 유중가스를 추출하고 상기 유중가스로부터 CH4/H2 및 C2H2/CH4를 각각 계산하는 제3단계; 및상기 제3단계에서 계산된 CH4/H2 및 C2H2/CH4로 이루어진 x,y 좌표를 상기 제5 X-Y 평면에서 결정하고 상기 결정된 영역으로부터 상기 진단용 유입변압기의 내부결함이 열적 결함(T)인지, 부분방전(PD)인지 또는 에너지방전(D1,D2)인지를 판단하는 제4단계; 를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제20항에 있어서,상기 제5 X-Y 평면의 전체 영역 중 상기 열적 결함 영역은 2<CH4/H2 및 0.3<C2H2/CH4 또는 0.01<C2H2/CH4≤0.3 또는 1<CH4/H2 및 C2H2/CH4≤0.01 이고 상기 부분방전(PD) 영역은 CH4/H2≤1 및 C2H2/CH4≤0.01 이고 상기 에너지방전(D1,D2) 영역은 CH4/H2≤2 및 0.3<C2H2/CH4인 것으로 하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 내부결함의 종류가 알려진 다수의 유입변압기별로 유중가스를 채취하고 상기 채취된 유중가스로부터 C2H4/C2H6 및 C2H2/C2H4를 각각 계산하는 제1단계;상기 내부결함 중 전기적 결함(E)의 부분방전(PD), 고에너지방전(D1), 저에너지방전(D2) 및 열적 결함(T)의 제1 열적결함(t<300℃)(T1), 제2 열적결함(300℃<t<700℃)(T2) 및 제3 열적결함(t>700℃)(T3)별로 각각 나타나는 C2H4/C2H6 및 C2H2/C2H4를 각각 x,y 좌표를 제6 X-Y 평면상에 설정하고 상기 설정된 다수의 좌표를 이용하여 상기 제6 X-Y 평면의 전체영역을 부분방전(PD)영역, 저에너지방전(D1)영역, 고에너지방전(D2)영역, 제1 열적결함(t<300℃)(T1)영역, 제2 열적결함(300℃<t<700℃)(T2)영역 및 제3 열적결함(t>700℃)(T3)영역으로 구분하는 제2단계;내부결함을 진단하고자 하는 진단용 유입변압기의 절연유로부터 유중가스를 추출하고 상기 유중가스로부터 C2H4/C2H6 및 C2H2/C2H4를 계산하는 제3단계; 및상기 제3단계에서 계산된 C2H4/C2H6 및 C2H2/C2H4로 구성된 x,y 좌표를 상기 제6 X-Y 평면에서 결정하고 상기 결정된 영역으로부터 상기 진단용 유입변압기의 내부결함이 부분방전(PD)인지, 저에너지방전(D1)인지, 고에너지방전(D2)인지, 제1 열적결함(t<300℃)(T1)인지, 제2 열적결함(300℃<t<700℃)(T2)인지 또는 제3 열적결함(t>700℃)(T3)인지를 판단하는 제4단계; 를 포함하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
- 제22항에 있어서,상기 제6 X-Y 평면의 전체영역 중 상기 부분방전(PD) 영역은 C2H4/C2H6≤0.04 또는 0.04<C2H4/C2H6≤0.5 및 0.65<C2H2/C2H4이고, 상기 저에너지방전(D1) 영역은 0.5<C2H4/C2H6≤1.5 및 0.65<C2H2/C2H4 또는 1.5<C2H4/C2H6 및 2.5<C2H2/C2H4 이고, 상기 고에너지방전(D2) 영역은 1.5<C2H4/C2H6 및 0.65<C2H2/C2H4≤2.5이고 상기 제1 열적결함 영역은 0.04<C2H4/C2H6≤1.7 및 0.00025<C2H2/C2H4≤0.01 또는 0.04<C2H4/C2H6≤0.8 및 0.01<C2H2/C2H4≤0.65이고, 상기 제2 열적결함 영역은 1.7<C2H4/C2H6≤4 및 0.0005<C2H2/C2H4≤0.01 또는 0.8<C2H4/C2H6≤4 및 0.01<C2H2/C2H4≤0.65 또는 0.04<C2H4/C2H6≤4 및 0.00005<C2H2/C2H4≤0.00025이며, 상기 제3 열적결함 영역은 0.04<C2H4/C2H6≤4 및 C2H2/C2H4≤0.00005 또는 1.7<C2H4/C2H6≤4 및 0.00025<C2H2/C2H4≤0.0005 또는 4<C2H4/C2H6 및 C2H2/C2H4≤0.65인 것으로 하는 유중가스 조성비를 통한 유입변압기의 내부결함 진단방법.
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