二次负荷对CVT计量误差的影响

CVT二次负荷的增大使二次回路的电流和电压降明显增大 ,严重影响计量的准确性。测试表明 ,减少计量二次回路电流可使CVT的二次回路压降同样程度的减少。因此 ,降低CVT的二次负荷 ,特别是降低计量回路的二次负荷可有效减小CVT的二次回路压降及所致的计量准确性下降 ,避免系统少计电量 ,经济效益显著。

Study on the Influence of the Secondary Load on the CVT Measurement Error

Because of the increase of the secondary load of CVT, the secondary loop current increases, and also the voltage-drop of the secondary loop increases, which seriously influence the measurement accuracy. From the result of test, when current of measuring secondary loop decreases 30 percent, the secondary loop voltage-drop still decreases 30 percent. Therefore, to decrease the secondary load of CVT, especially to debase the secondary load of measuring loop will be very effective to reduce the secondary loop voltage drop of CVT and improve the accuracy of measurement, and it is also apparently effective to avoid system measurement inaccuracy and enhance economy benefit.