人体感知电流阈值与脑电图特征的关联研究

在电气产品的漏电安全性能测试中,人体感知电流是最重要的指标之一.传统上,人体感知电流阈值的测定完全依赖受试者的主观感受,可靠性、一致性较差.依据脑电活动机理建立了实验研究方案,获得了382组实验数据,探索了脑电特征与感知电流阈值的关系.研究发现:时域脑电图经快速傅里叶变换后,频域特性与感知电流阈值之间存在明显的关联:绝大多数人通电前后脑电特征确有明显变化,该变化包含a波或b波幅度抑制或增强,但其明确的对应变化规律,尚待进一步深入研究,研究结果将有助于对电气安全性能的客观认定.

Research on the relation between human current threshold for perception and feature of electroencephalogram

In testing the electrical safety performance of leakage current on electrical products, human current threshold for perception is one of the most important parameters. Traditionally, the testing of human current threshold for perception depends on their subjective feelings, and has poor reliability and consistency. In the paper, an experiment research method is established based on the principle of EEG (electroencephalogram) activity, 382 groups of experimental data are obtained, and the relationship between current threshold for perception and EEG is explored. The study finds that there is obvious relation between current threshold for perception and frequency-domain EEG transformed characteristic from time-domain EEG by FFT (Fast Fourier Transform). The vast majority of people EEGs have obvious change when perception threshold currents flow through human bodies, which includes the amplitude decreasing or increasing of α or β waves. But further study about its clear changing rule is needed, which is helpful for confirming the electrical safety performance objectively.