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数字功率计的技术指标

技术指标:
额定电压
数字功率计可以长时间承受的正弦波电压的方均根值,在该电压以下,功率计的测量误差绝对值应小于标称准确级对应的相对误差乘以额定电压得到的数值。例如,功率计的电压测量准确级为0.1级,额定电压为1000V,那么,当电压小于1000V时,误差的绝对值应小于1000x0.1%=1V。
额定电流
数字功率计可以长时间承受的正弦波电流的方均根值,在该电流以下,功率计的测量误差绝对值应小于标称准确级对应的相对误差乘以额定电流得到的数值。例如,功率计的电流测量准确级为0.1级,额定电流为10A,那么,当电流小于10A时,误差的绝对值应小于10x0.1%=0.01A。
额定频率
数字功率计标称准确级的参考频率,通常为50Hz。
准确级
对数字功率计测量精度给定的等级,数字功率计在规定使用条件下的误差应在规定的限值内。标准准确级有:0.05级、0.1级、0.2级、0.5级、1级、2级等,准确级对应数值越小,表明功率计的测量精度越高。0.05级表示功率测量的误差限制为±0.05%。
注意:一般功率计在额定电压、额定电流、额定频率及功率因数为1的条件下标称。电压较低,电流较小,频率偏离,功率因数较低等因数,均会导致功率计的测量精度降低。

Technical indicators:
Rated voltage
The Fangjun value of the sine wave voltage that the digital power meter can withstand for a long time. Below this voltage, the absolute value of the measurement error of the power meter should be less than the value obtained by multiplying the relative error corresponding to the nominal accuracy level by the rated voltage. For example, the power meter has an accurate voltage measurement level of 0.1 and a rated voltage of 1000V. Then, when the voltage is less than 1000V, the absolute value of the error should be less than 100x0.1 % = 1V.
rated current
The Fangjun value of the sine wave current that the digital power meter can withstand for a long time. Below this current, the absolute value of the measurement error of the power meter should be less than the value obtained by multiplying the relative error corresponding to the nominal accuracy level by the rated current. For example, the power meter has an accurate current measurement level of 0.1 and a rated current of 10A. Then, when the current is less than 10A, the absolute value of the error should be less than 10x0.1 % = 0.01A.
Rated frequency
The reference frequency of the digital power meter labeled accurate level is usually 50Hz.
Accurate level
For the given level of measurement accuracy of the digital power meter, the error of the digital power meter under the specified conditions of use should be within the specified limit value. The standard accuracy levels are: 0.05, 0.1, 0.2, 0.5, 1, and 2. The smaller the corresponding values of the accuracy level, the higher the measurement accuracy of the power meter. The 0.05 level indicates that the error limit for power measurement is ± 0.05 %.
Note: The general power meter is labeled under the condition of rated voltage, rated current, rated frequency and power factor of 1. Lower voltage, lower current, frequency deviation, lower power factor and other factors will lead to lower measurement accuracy of the power meter.

发布日期:[2019-9-24]  共阅[125]次  〖打印此页〗 返回列表

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