Structure of shield terminal wire harness:
The wrapped conductor is called the shielding layer, which is generally conductive cloth, braided copper mesh or copper (aluminum) platinum.
Ordinary: insulation layer + shielding layer + wire.
Advanced: insulation layer + shielding layer + signal wire + shielding layer grounding wire.
The shielding layer generally needs to be grounded. The function of the shield terminal wire is to isolate the electromagnetic field noise source from the sensitive equipment and cut off the propagation path of the noise source.
The role of shield terminal wire harness:
Shielding is divided into active shielding and passive shielding. The purpose of active shielding is to prevent noise sources from radiating outward, which is to shield the noise source; the purpose of passive shielding is to prevent sensitive equipment from being interfered by noise sources and to shield sensitive equipment.
The shielding layer of the shielding terminal wire is not allowed to be grounded at multiple points, because different grounding points are always different, and there is a potential difference at each point.
If multiple points are grounded, current will be formed in the shielding layer, which not only fails to shield, but introduces interference. Especially in the occasions where frequency converters are used, the interference contains various high-order harmonic components, causing greater impact.