Search

KR-102963034-B1 - APPARATUS AND METHOD FOR ESTIMATING LOCATION OF DEFECTS IN TRANSFORMER THROUGH OIL GAS ANALYSIS

KR102963034B1KR 102963034 B1KR102963034 B1KR 102963034B1KR-102963034-B1

Abstract

The present invention provides an apparatus and method for estimating the location of a transformer defect through oil-dissolved gas analysis. An apparatus for estimating the location of a transformer defect through oil-dissolved gas analysis according to one embodiment of the present invention may include an oil-dissolved gas analysis unit that analyzes the components of oil-dissolved gas from a transformer, a material estimation unit that estimates a pre-set material of a transformer based on the components of oil-dissolved gas analyzed by the oil-dissolved gas analysis unit, and a defect location determination unit that determines the location where the estimated material is used in the transformer as a defect location according to the material estimated by the material estimation unit. An apparatus for estimating the location of a transformer defect through oil-dissolved gas analysis according to one embodiment of the present invention may include the steps of: an oil-dissolved gas analysis unit analyzing the components of oil-dissolved gas from a transformer; a material estimation unit estimating a pre-set material of a transformer based on the components of oil-dissolved gas analyzed by the oil-dissolved gas analysis unit; and a defect location determination unit determining the location where the estimated material is used in the transformer as a defect location according to the material estimated by the material estimation unit.

Inventors

  • 오중기

Assignees

  • 에이치디현대일렉트릭 주식회사

Dates

Publication Date
20260512
Application Date
20220620

Claims (13)

  1. Oil gas analysis unit for analyzing the components of oil gas from a transformer; A material estimation unit that estimates the material of a pre-set transformer based on the components of the oil gas analyzed by the above oil gas analysis unit; and It includes a defect location determination unit that determines the location where the estimated material is used among the transformers as a defect location according to the material estimated by the material estimation unit, and The above defect location determination unit determines the defect location to be at least one of the core part, shielding part, lead extraction part, clamp, winding part, and angling of the transformer according to the transformer material estimation result of the above material estimation unit. Transformer fault location estimation device through oil-dissolved gas analysis.
  2. In paragraph 1, The above oil-dissolved gas analysis unit is a transformer fault location estimation device through oil-dissolved gas analysis that analyzes hydrogen H₂ , carbon monoxide CO, methane CH₄ , acetylene C₂H₂ , ethylene C₂H₄ , and ethane C₂H₆ components in the oil-dissolved gas from the transformer.
  3. In paragraph 1, The above material estimation unit is a transformer defect location estimation device through oil-in-gas analysis that estimates the transformer material as non-oil rubber (NBR) if the component analysis result from the above oil- in -gas analysis unit corresponds to a first result in which the ratio between the methane CH4 component and the ethane C2H6 component is less than or equal to a preset first reference value.
  4. In paragraph 3, The above material estimation unit determines that the component analysis result from the above oil-in-gas analysis unit does not correspond to the above first result, and includes methane CH4 component, and Hydrogen H₂ component and methane CH₄ component and acetylene C₂H₂ component and A transformer defect location estimation device through oil-dissolved gas analysis that estimates the transformer material as insulating oil if the ratio between the sum of ethylene C₂H₄ and ethane C₂H₆ components corresponds to a second result in which the ratio is less than or equal to a preset second reference value.
  5. In paragraph 4, The above material estimation unit is a transformer defect location estimation device through oil gas analysis that estimates the transformer material as insulating paper if the oil gas component analysis result from the above oil gas analysis unit does not correspond to the above first result and the above second result.
  6. delete
  7. delete
  8. delete
  9. In paragraph 1, A transformer fault location estimation device through oil-dissolved gas analysis, further comprising a fault type determination unit that determines the type of fault occurring in the transformer based on the components of the oil-dissolved gas analyzed by the oil-dissolved gas analysis unit.
  10. A step in which the oil-in-gas analysis unit analyzes the components of the oil-in-gas from the transformer; A step in which a material estimation unit estimates the material of a pre-set transformer based on the components of the oil gas analyzed by the oil gas analysis unit; and The defect location determination unit includes a step of determining the location where the estimated material is used among the transformers as a defect location according to the material estimated by the material estimation unit, and The above determining step comprises the defect location determining the defect location to at least one of the core, shielding, lead extraction, clamp, winding, and angling of the transformer according to the transformer material estimation result of the material estimation unit. Method for estimating transformer fault location through oil-dissolved gas analysis.
  11. In Paragraph 10, The step of estimating the above material comprises the material estimation unit estimating the transformer material as oil-resistant rubber ( NBR) if the component analysis result of the oil gas from the oil gas analysis unit corresponds to a first result in which the ratio between the methane CH₄ component and the ethane C₂H₆ component is less than or equal to a preset first reference value. Method for estimating transformer fault location through oil-dissolved gas analysis.
  12. In Paragraph 11, The step of estimating the above material is that the material estimation unit determines that the component analysis result of the oil gas from the oil gas analysis unit does not correspond to the first result, and includes methane CH4 component, and Hydrogen H₂ component and methane CH₄ component and acetylene C₂H₂ component and If the ratio between the sum of the ethylene C₂H₄ and ethane C₂H₆ components corresponds to a second result that is less than or equal to a pre-set second reference value , the transformer material is presumed to be insulating oil. Method for estimating transformer fault location through oil-dissolved gas analysis.
  13. In Paragraph 12, The step of estimating the above material is for the material estimation unit to estimate the transformer material as insulating paper if the oil gas component analysis result from the oil gas analysis unit does not correspond to the first result and the second result. Method for estimating transformer fault location through oil-dissolved gas analysis.

Description

Apparatus and Method for Estimating Location of Defects in Transformer Through Oil Gas Analysis The present invention relates to an apparatus and method for estimating the location of transformer defects through oil-dissolved gas analysis. Generally, transformers are employed among the various assets of power generation and transmission/distribution facilities, and unexpected accidents in transformers result in significant losses for the companies operating these facilities and for electricity users. To prevent such accidents, electrical and physicochemical diagnostic methods for assessing the condition of transformers prior to an accident are being disclosed; however, these methods for diagnosing internal transformer defects only estimate the type of defect and cannot determine its location. Generally, if a defect is identified through transformer condition diagnosis, the transformer is disconnected from the system during a power outage to perform internal inspection or repair. Inspection and repair require dismantling the transformer; however, if the location of the defect is unknown, a significant amount of time must be spent locating the fault in addition to the repair time, and this time becomes even longer, particularly for high-capacity transformers. FIG. 1 is a schematic diagram of a transformer defect location estimation device through oil gas analysis according to an embodiment of the present invention, which can estimate the defect location by analyzing characteristic oil gas due to the material of the transformer. FIG. 2 is a schematic flowchart of a method for estimating the location of a transformer defect through oil-in-gas analysis according to one embodiment of the present invention. Figures 3 (a), (b), and (c) are graphs of the characteristics of gas generation in oil under thermal defect conditions (180–220°C) for three types of materials used in transformers, respectively. Hereinafter, preferred embodiments are described in detail with reference to the attached drawings so that a person skilled in the art can easily implement the present invention. FIG. 1 is a schematic diagram of a transformer defect location estimation device through oil gas analysis according to an embodiment of the present invention, which can estimate the defect location by analyzing characteristic oil gas due to the material of the transformer. Referring to FIG. 1, a transformer fault location estimation device through oil-in-gas analysis according to one embodiment of the present invention may include an oil-in-gas analysis unit (110), a material estimation unit (120), and a fault location determination unit (130), and may further include a fault type determination unit (140). The oil vapor analysis unit (110) can analyze oil vapor from the transformer (A). The transformer (A) may be composed of various materials such as insulating paper, insulating oil, pressboard, and oil-resistant rubber (NBR), and the aforementioned various materials such as insulating paper, insulating oil, pressboard, and oil-resistant rubber (NBR) may constitute components of the transformer such as a core section, a winding section, and a lead out section. If an electrical or thermal defect occurs in the transformer (A), oil vapor gas may be generated. The oil vapor analysis unit (110) can analyze the components of the oil vapor gas from the transformer (A). The material estimation unit (120) can estimate the material of a pre-set transformer based on the components of the oil gas analyzed by the oil gas analysis unit (110). The components of the oil gas analyzed by the oil gas analysis unit (110) may include hydrogenH₂ , carbon monoxide CO, methane CH₄ , acetylene C₂H₂ , ethylene C₂H₄ , and ethane C₂H₆ . FIG. 2 is a schematic flowchart of a method for estimating the location of a transformer defect through oil-in-gas analysis according to one embodiment of the present invention. Referring to FIG. 2 together with FIG. 1, the material estimation unit (120) can estimate the material of the transformer as oil-resistant rubber (NBR) ( S2 ) if, based on the components of the oil-dissolved gas analyzed by the oil-dissolved gas analysis unit (110), the oil-dissolved gas data from the oil-dissolved gas analysis unit (110) corresponds to a first result (S1) in which the ratio between the methane CH₄ component and the ethane C₂H₆ component is less than or equal to a preset first reference value. For example, (Equation 1) If it corresponds to this, the material of the transformer can be presumed to be oil-resistant rubber (NBR). If the oil gas data from the oil gas analysis unit (110) does not correspond to the first result described above, and the methane CH4 component, and Hydrogen H₂ component and methane CH₄ component and acetylene C₂H₂ component and If the ratio between the sum of the ethylene C₂H₄ and ethane C₂H₆ components corresponds to a second result that is less than or equal to a preset second reference value (S4), the material estimation