不当接地所引发的电磁干扰
EMI Caused by Improper Grounding
摘要 电子系统与计算机进行仿真实验时发生的电磁干扰;在排除电梯、车辆、电源线、信号线干扰对仿真实验的影响后,调查发现,原来电子系统和计算机分别由两组独立电源供电,每组电源都有接地桩,两个接地桩和信号地线围成面积约为300 m2的地回路;当实验接通电源的瞬间,瞬变电流在地回路内生成幅度很大的EMI信号,这是系统发生E电磁干扰的真正原因。控制此EMI的办法就是破坏掉这个地回路,从而实现仿真实验的正常运行。通过这次实践,使我们认识到地回路与控制EMI的关系,对指导电缆敷设和接地设计有一定的意义。
关键词 电磁干扰(EMI);接地;TN-C-S接地;接地桩;地回路
Abstract An EMI was happened when a simulating test was going on between a
computer and an electronic system is described in this paper. In order to know where
the EMI came from, a lot of time was spent to remove EMI effect from elevator,vehicles,
power-line and signal-line. Finally, it was found that the computer and electronic
system were supplied by two independent power systems of TN-C-S grounding that
must have their individual grounding stick. Then these grounding sticks and signal
grounding formed a large grounding loop which was around 300 square meters. When
the powers witch on,a big EMI signal was produced within the grounding loop and
that destroyed the test. When the grounding loop removed, the simulating test was
going on very well. From this lesson we should be very careful when designed cabling
and wiring ground
Keywords electromagnetic interference (EMI); grounding;TN-C-S grounding;
grounding stick; grounding loop
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