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電力系統故障中英文資料外文翻譯文獻(編輯修改稿)

2026-01-10 20:54 本頁面

　

【文章內容簡介】 n their operation at elevated temperature. Any small void present in the body of the insulating material will results in ionization of the gas contained therein, the products of which react unfavorably with the insulation. Deterioration of the insulation may result in failure of the material to retain its insulating properties, and short circuits will develop between the cable conductors. The possibility of cable failure is increased if lightening or switching produces transient voltage of abnormally high values between the conductors. Transformer failures may be the result of insulation deterioration bined with overvoltage due to lightning or switching transients. Short circuit due to insulation failure between adjacent turns of the same winding may result from suddenly applied overvoltage. Major insulation may fail, permitting arcs to be established between primary and secondary windings or between winding and grounded metal parts such as the core or tank. Generators may fail due to breakdown of the insulation between adjacent turns in the same slot, resulting in a short circuit in a single turn of the generator. Insulation breakdown may also occur between one of the winding and the grounded steel structure in which the coils are embedded. Breakdown between different windings lying in the same slot results in shortcircuiting extensive section of machine. Balanced threephase faults, like balanced threephase loads, may be handled on a lioneutral basis or on an equivalent singlephase basis. Problems may be solved either in terms of volts, amperes, and ohms. The handing of faults on singlephase lines is of course identical to the method of handing threephase faults on an equivalent singlephase basis. Faults may be classified as permanent or temporary. Permanent faults are those in which insulation failure or structure failure produces damage that makes operation of the equipment impossible and requires repairs to be made. Temporary faults are those which may be removed by deenergizing the equipment for a short period of time, short circuits on overhead lines frequently are of this nature. High w

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