基于极性变化直流电压源的铁磁元件铁心剩磁通测量方法
发布时间：2018-09-07 20:55
【摘要】：剩磁通可能给变压器带来较大的励磁涌流,影响测量互感器的测量精度。然而目前对于变压器的铁心剩磁通测量还没有规范的方法。为了便捷地测量铁心剩磁通,提出一种采用极性变化的直流电压源来测量铁磁元件铁心剩磁通和剩磁系数的方法。该方法采用半桥电路获得极性变化的直流电压,并施加在绕组两端,使铁心分别达到正、负饱和点。绘制整个过程中的磁通与电流关系曲线,即可得到铁心的部分饱和磁滞回线,根据获得的饱和磁滞回线来计算铁心剩磁通和剩磁系数。并且在电流互感器上开展实验,测得在正、负饱和剩磁点和退磁后的磁通零点的剩磁通平均值分别为4.001m Wb、-3.844m Wb和0.048m Wb。结果表明,该方法具有较高的准确性和稳定性,而且需要的退磁电源功率小,方便携带。
[Abstract]:Remanent flux may bring a large inrush current to the transformer and affect the measuring accuracy of the transformer. However, there is no standard method to measure the remanence flux of transformer core. In order to measure the remanent magnetic flux of iron core conveniently, a method of measuring the remanence flux and the coefficient of remanence of ferromagnetic element by using a DC voltage source with variable polarity is proposed. The half-bridge circuit is used to obtain DC voltage with polarity variation and applied to the two ends of the winding to make the core reach the positive and negative saturation points respectively. The partial saturated hysteresis loop of the core can be obtained by drawing the curve of the relationship between flux and current in the whole process. According to the obtained saturated hysteresis loop, the remanent flux and the coefficient of remanence of the core can be calculated. The results of experiments on current transformer show that the average value of residual flux at positive and negative saturation remanence points and after demagnetization is 4.001 Wb,-3.844m Wb and 0.048 m Wb., respectively. The results show that the method has high accuracy and stability, and the demagnetization power supply is small and easy to carry.
【作者单位】： 云南电力技术有限责任公司;输配电装备及系统安全与新技术国家重点实验室(重庆大学);云南电力试验研究院(集团)有限公司;
【基金】：中国南方电网有限责任公司科技项目资助(K-YN2014-136)
【分类号】：TM27;TM936
本文编号：2229389
[Abstract]:Remanent flux may bring a large inrush current to the transformer and affect the measuring accuracy of the transformer. However, there is no standard method to measure the remanence flux of transformer core. In order to measure the remanent magnetic flux of iron core conveniently, a method of measuring the remanence flux and the coefficient of remanence of ferromagnetic element by using a DC voltage source with variable polarity is proposed. The half-bridge circuit is used to obtain DC voltage with polarity variation and applied to the two ends of the winding to make the core reach the positive and negative saturation points respectively. The partial saturated hysteresis loop of the core can be obtained by drawing the curve of the relationship between flux and current in the whole process. According to the obtained saturated hysteresis loop, the remanent flux and the coefficient of remanence of the core can be calculated. The results of experiments on current transformer show that the average value of residual flux at positive and negative saturation remanence points and after demagnetization is 4.001 Wb,-3.844m Wb and 0.048 m Wb., respectively. The results show that the method has high accuracy and stability, and the demagnetization power supply is small and easy to carry.
【作者单位】： 云南电力技术有限责任公司;输配电装备及系统安全与新技术国家重点实验室(重庆大学);云南电力试验研究院(集团)有限公司;
【基金】：中国南方电网有限责任公司科技项目资助(K-YN2014-136)
【分类号】：TM27;TM936
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