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1 超常误差出现的原因 在新投运的电力调度远动数采系统中,常会看到调度主端模拟屏上的数显值与终端变电站盘表指示值相差悬殊,有时高达20％～100％。各遥测回路内的测量元件在安装前都是按照计量标准校验过的,其综合误差最大不会超过0.5％,而变电站指示仪表最大误差允许值是2％,两误差相加不会超过2.5％,这样的误差仅凭视觉是比较不出来的。如果凭视觉能够分辨出来的误差至少在10％以上,这种误差应该称作超常误差。一般情况下能够影响遥测回路出现超常误差的原因只有微机程序中测量系数的设置和测量元件的外部结线的问题。
1 abnormal error reasons In the newly commissioned power dispatching remote data mining system, we often see the main dispatching simulation of the screen digital display value and the terminal substation disk table indicating a significant difference, sometimes as high as 20% to 100% . The measuring elements in each telemetry circuit are verified according to the measurement standards before installation, and the comprehensive error will not exceed 0.5% at the maximum. The allowable maximum error of the substation indicating instrument is 2%, and the sum of the two errors will not exceed 2.5 %, This error can not be visual alone. If the visual error can be resolved at least 10% or more, this error should be called abnormal error. Under normal circumstances can affect the telemetry loop abnormal error is only caused by the setting of the measurement factor in the microcomputer program and the external connection of the measuring element.