特高压串补平台测量箱的大电流试验研究

串补装置的平台测量箱位于电容器平台上,用于测量串补装置的各个电流,与可能流过数十kA的管母和连接支路的距离较近,因此,需要考核强电磁场情况下平台测量箱的电气性能指标。首先,给出箱体的电磁屏蔽效能工程计算公式,并据此估算出平台测量箱的工频电磁屏蔽效能;然后对平台测量箱进行大电流试验,用以模拟实际工况下的强工频电磁环境,测试平台测量箱体的工频电磁屏蔽效能和此情况下平台测量箱的性能。需要指出的是提出的大电流试验无法充分验证工频以外频率下平台测量箱的电磁兼容性。然而,鉴于大电流试验结果和箱体电磁屏蔽效能计算公式的计算结果一致,可根据计算公式对平台测量箱在各种频率下的电磁骚扰的抗扰度做出合理的估计。

Study on High Current Experiments of Measurement Box Located on Platform of Series Capacitor Compensation for UHV Power Transmission Project

The measurement box for seried compensation equipment is located on capacitor platform to measure currents of the compensator,so it is near to the tubular bus and connecting branch in which tens of kiloampere current may flow,so it is necessary to check the electric performance index of the measument box located on the platform under strong electric field strength.Firstly,the formula to calculate the electromagnetic shielding effect of the case body is given and by which the power frequency electromagnetic shielding performance of the case body of the meadurement box is evaluated;then the high current test of the case body to simulate the strong power frequency electromagnetic environment under actual operation condition should be performed and under such a condition the power frequency electromagnetic shielding effect of the case body as well as the performance of the measurement box are tested;It has to be pointed out that the proposed high current test cannot fully verify the electromagnetic compatibility of the measurement box under the frequencies different from power frequency.However,in view of the consistency of high current test results with calculation results of case body’s electromagnetic shielding performance by the given formula,thus according to the given formula it is possible to reasonably evaluate the anti-interference effect of the measurement box to electromagnetic disturbances with various frequencies.