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Assessment of Degradation Within Transformer Insulation Systems, IEE Colloquium on

Date 6 Dec 1991

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Displaying Results 1 - 9 of 9
  • HPLC contribution to transformer survey during service or heat run tests

    Publication Year: 1991 , Page(s): 5/1 - 5/4
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (232 KB)  

    The author discusses the use of high performance liquid chromatography (HPLC) in evaluating the state of the paper insulation in power transformers. The method used is discussed and results of a transformer survey are tabulated. Various relationships between paper degradation parameters and temperature are shown View full abstract»

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  • The role of transformer oil analysis in the detection of fault conditions

    Publication Year: 1991
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (32 KB)  

    Summary form only given. The author emphasises the role which dissolved gas analysis continues to play, highlighting the clear cost benefit which can be achieved by a well managed diagnostic service on transformer oils. Examples are given of experiences where developing faults have been tracked by dissolved gas analysis, using both manual oil sampling and online techniques. An update is given of t... View full abstract»

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  • Condition monitoring of HV transformers using oil analysis techniques

    Publication Year: 1991 , Page(s): 2/1 - 2/2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (76 KB)  

    Approximately 30% of the 132 kV grid transformers over 40 years old. It has become imperative to determine the integrity of their insulation and estimate their residual life. An investigation was carried out to determine the most useful parameters likely to reflect changes in the integrity of the winding insulation before occurrence of a fault. Another object was to assess if such changes could be... View full abstract»

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  • Interpretation of DGA data and its use in the detection of malfunctions [transformers]

    Publication Year: 1991 , Page(s): 3/1 - 3/4
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (184 KB)  

    Dissolved gas analysis (DGA) has been used for more than 20 years to evaluate the behaviour of oil filled electrical equipment. The analysis carried out by gas chromatography, allows the determinations of the principal gas, hydrogen, hydrocarbons in C1, C2 and C3 and carbon oxides, which can be generated by an oil impregnated insulation under various fault conditions. The IEC 567 Publication gives... View full abstract»

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  • Partial discharges within power transformers and the use of ultrasonic techniques in their location

    Publication Year: 1991 , Page(s): 7/1 - 7/3
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (132 KB)  

    A power frequency partial discharge (PD) within the insulation structure of a power transformer (e.g. within a cavity or an inclusion) is generally regarded as being the instantaneous breakdown of a small capacitance which forms a part of the insulation capacitance as a whole. This discharge creates a short current pulse which is repeated every time the small capacitance is recharged to a level su... View full abstract»

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  • The desired properties and their effect on the life history of insulating papers used in a fluid-filled power transformer

    Publication Year: 1991 , Page(s): 4/1 - 4/4
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (168 KB)  

    The author stresses the importance of transformer insulation and then discusses paper covered conductors. The relevant standards are mentioned and the parameters required of the paper are described. The author then discusses the use of the paper in transformer winding manufacture, transformer processing, and testing. In-service operation of the paper insulation is discussed View full abstract»

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  • IEE Colloquium on `Assessment of Degradation Within Transformer Insulation Systems' (Digest No.184)

    Publication Year: 1991
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (92 KB)  

    The following topics were dealt with: power transformer insulation analysis; dissolved gas analysis; chromatography; transformer oil analysis; paper insulation; and winding movement detection View full abstract»

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  • Extension of life span of power transformer on-site improvement of insulating materials

    Publication Year: 1991 , Page(s): 6/1 - 6/4
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (132 KB)  

    A number of researchers have studied the ageing of cellulose and demonstrated the deleterious effect of high temperature, moisture and air on paper life. This is expressed as a reduction in degree of polymerisation (DP). At low DP values the paper would be brittle and unable to withstand a mechanical shock. Important features creating damage are high levels of acidity and sludge. Acids and peroxid... View full abstract»

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  • Transformer winding movement and fault detection

    Publication Year: 1991 , Page(s): 8/1 - 8/2
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (100 KB)  

    The author discusses the frequency response analysis tests for transformers. The frequency response of a winding is a function of the series and shunt capacitances and inductances between individual turns of the winding and from the winding to earth. These impedances and the frequency response change if the winding, or part of the winding, is displaced. There are two distinct methods of measuring ... View full abstract»

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