Research on Ultra-Wide-Band High Voltage Measuring System Utilizing Electric Field Sensing

实验测量了上一财年设计和制造的超宽带高压分压器的高压脉冲测量系统的分压比和响应特性。一般来说，很难通过在低频下测量高压分压器的各个部分的阻抗来精确地知道分压器比。通过精确的三维静电场分析和低压臂阻抗的测量，可以在不进行对比测试的情况下确定分压器的分压比。这次，通过与低阻抗分压器的对比测量确定了分压器的分压比。测量的阻尼电阻为200欧姆的系统的阶跃响应达到了5.5ns的响应时间，和75ns的建立时间。这些数字与有史以来报道的最好的高压分压器的数字相当，并且对于具有以下特性的分压器是不可预见的： ...更多信息 高阻抗。因此，它已被证明，开发的高电压测量系统具有超宽带特性。这些数字很好地明确了1994年11月完全修订的相关IEC标准对最快参考测量系统的要求。这种类型的高压测量系统的缺点是，由于附近存在其他物体，分压比容易受到周围静电场的失真影响。这种效果已通过三维静电场分析和实验进行了评估。根据修订后的IEC标准，参考测量系统的精度要求为± 0.5%。作为本研究的结果，已知连接高压分压器和脉冲发生器或被测物体的引线的高度对测量精度的影响很小。所研制的1MV级高压测量系统在分压器与冲击发生器或被测物体的距离大于7 m，与接地物体或实验室墙壁的距离大于4 m时，仍能保持测量精度。由于这些限制可以很容易地克服在一个大型的高压实验室，所以在本研究中设计和制造的高压测量系统的实用性已被证实。少

The divider ratio and the response characteristics of the high voltage impulse measuring system, which incorporates the ultra-wide-band high voltage divider designed and manufactured in the previous fiscal year, have been measured experimentally. In general, it is difficult to precisely know the divider ratio by measuring the impedance of individual parts of a high voltage divider at a low frequency. It will be possible to determine the divider ratio without performing the comparison test through the accurate three-dimensional electrostatic field analysis and the measurement of the impedance of the low voltage arm. This time, the divider ratio was determined by the comparison measurement with a low impedance divider.The measured step response of the system with the damping resistor of 200 Ohms achieved 5.5ns of the response time, and 75ns of the settling time. These numbers are comparable to those of the best high voltage dividers ever reported, and are not foreseen for dividers having … More high impedance. Thus it has been demonstrated that the developed high voltage measuring system has an ultra-wide-band characteristic. These numbers well clear the requirements for the fastest reference measuring system, demanded by the relevant IEC Standard totally revised in November 1994.The drawback of this type of a high voltage measuring system is that the divider ratio is susceptible to the distortion of surrounding electrostatic field due to the presence of other objects in the vicinity. This effect has been evaluated through a three-dimensional electrostatic field analysis and experiments. The accuracy of plus minus 0.5% is demanded for a reference measuring system according to the revised IEC Standard. As a result of the present study, the height of the lead wire connecting the high voltage divider and the impulse generator or the object under test is known to have little influence on the accuracy of the measurement. The manufactured 1MV-class high voltage measuring system kept its accuracy when the divider was more than 7m away from the impulse generator or the object under test, and was more than 4m apart from grounded objects or the walls of the laboratory. As these limitations can easily be overcome at a large high voltage laboratory, so the usefulness of the high voltage measuring system designed and manufactured in the present study has been confirmed. Less