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    • 9. 发明申请
    • TIME OF TAP CHANGER IN THE SAME CONTACT POSITION
    • 时间更换在同一接触位置
    • WO2011000928A1
    • 2011-01-06
    • PCT/EP2010/059396
    • 2010-07-01
    • ABB TECHNOLOGY LTDANDERSSON, GunnarSTENESTAM, Bengt-Olof
    • ANDERSSON, GunnarSTENESTAM, Bengt-Olof
    • G01K7/42
    • G01K7/42
    • The present invention relates to a method for calculating a time period, for which time period a tap changer in a transformer is placed in the same position. The method comprising the steps of measuring the temperature of the cooling and isolating media surrounding said tap changer and measuring the current load in the tap changer. Further, from the measured values of the cooling and isolating media temperature and the current load is the contact temperature calculated. The temperature of the A-spots located in the contact surface is then calculated from the calculated contact temperature and the measured current load. An ageing acceleration is calculated from the calculated temperature of the A-spots, and a maximum time period for the tap changer to be in the same position is calculated from the calculated temperatures and said ageing acceleration.
    • 本发明涉及一种用于计算变压器中的分接开关置于相同位置的时间段的时间段的方法。 该方法包括以下步骤:测量围绕所述分接开关的冷却和隔离介质的温度并测量分接开关中的电流负载。 此外,从冷却和隔离介质温度和电流负载的测量值计算接触温度。 然后根据计算的接触温度和测量的电流负载计算位于接触表面的A点的温度。 根据计算的A点温度计算老化加速度,并根据计算的温度和所述老化加速度计算分接开关处于相同位置的最大时间段。