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多谢大家的回复。#13说的"宁愿信其有,不愿信其无".的心理辐射我同意。我在网上找到了澳洲政府的关于Measuring Magnetic Fields的资料,现和大家分享。看来Transmission line 比Substation 辐射大很多。
Homes near power lines
The power lines that are present in typical neighbourhoods are called "distribution" lines and they usually carry less voltage than "transmission" lines, which carry very high voltages. As stated earlier, however, it is the current and not the voltage that is associated with the strength of the magnetic field. Therefore, proximity to high voltage lines will not necessarily give a high reading unless those lines are also carrying a large current. Typical values of magnetic fields measured near power lines and substations are listed in the table below.
Source Location of measurement Range of measurements (mG)*
Distribution Line directly underneath 2 - 30
Distribution Line 10m away 0.5 - 10
Substation at substation fence 1 - 8
Transmission line directly underneath 10 - 200
Transmission line at edge of easement 2 - 50
* Note: Levels of magnetic fields may vary from the range of measurements shown |
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