Repetitive current limiter based on polymer PTC resistor
Repetitive current limiter based on polymer PTC resistor
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DOI：
10.1109/61.660919
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发表时间：
1998-04
影响因子：
4.4
通讯作者：
J. Skindhoj;J. Glatz-Reichenbach;R. Strümpler
中科院分区：
文献类型：
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作者：
J. Skindhoj;J. Glatz-Reichenbach;R. Strümpler
到目前为止，作为保险丝的单触发装置已用于限制和中断短路电流。重复限流器（CL）已开发使用聚合物复合材料作为设备的功能部分。CL能够通过快速增加8到10个数量级的电阻来限制和中断流过它的故障电流。在交流发电机电路上进行短路试验，预期试验电流为16 kA/sub RMS/，U=220 V/sub RMS/，峰值限制为3 kA。此外，还使用电容器电池进行了进一步的短路测试，其中可变预期电流在0.7和78 kA/sub RMS/之间。CL对短路电流的限制是由聚合物复合材料的基体的热膨胀引起的，这导致导电填料颗粒的强制分离。通过使用快速激光距离传感器来监测在亚ms范围内具有/spl mu/m尺度的幅度的这种快速运动。为了将电流限制到可忽略的值，聚合物复合材料的必要机械膨胀在700 /spl mu/s内为40 /spl mu/m。
Until now, one shot devices as fuses have been used for the limitation and interruption of short-circuit currents. A repetitive current limiter (CL) has been developed using a polymer composite as the functional part of the device. The CL is able to limit and interrupt a fault current flowing through it by a fast increase of its resistance by eight to ten orders of magnitude. Short-circuit tests were carried out on an AC generator circuit with a prospective test current of 16 kA/sub RMS/, U=220 V/sub RMS/, which was limited to 3 kA in peak. Also further short-circuit tests were performed using a capacitor battery with variable prospective currents between 0.7 and 78 kA/sub RMS/. The limitation of the short-circuit current by the CL is caused by the thermal expansion of the matrix of the polymer composite, which leads to a forced separation of the conducting filler particles. This fast motion in the sub-ms range with amplitudes on a /spl mu/m-scale is monitored by using a fast laser distance sensor. The necessary mechanical expansion of the polymer composite for a limitation of the current to a negligible value is 40 /spl mu/m within 700 /spl mu/s.