Treatment of cable shielding wires for instrument computers
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Multiple pairs of shielded computer cables are used on-site, along with split-screen and summary screens. The wiring terminals on the field instruments require shielded wires to be connected to them; however, once the insulation is removed from the cables, what remains is a copper braid. How is this typically handled in the field?
Generally, it’s not connected on the instrument side; it’s connected on the DCS side
It is generally single-sided grounding, with all connections grounded on the DCS side
This post was last edited by hfrs on 2017-6-8 09:06. Terminals are usually pin-type, and direct connection is not very convenient; the use of strain reliefs is also awkward. Using binding to lead out the yellow and green wires is one of the common methods for shielding and grounding – is this acceptable? Or, if you want to connect the shielded wire in this way, you should order one with a shielded composite tape coating and copper wires for connection, so that it can be connected directly; a copper mesh is certainly not suitable for such connections.
Single-ended grounded shielded tape with copper wire leads – used only in high-voltage cables
What does shielding composite tape winding mean? Is it a shielded cable? What specific materials are used in the binding method? Does it mean welding the shielding wire together with the yellow-green wire? How exactly should it be handled? Thank you
Damn it. The first question is copper foil or aluminum foil. The second question: binding. Don’t you understand?
Our designs feature terminals on the top, but in actual use I’ve seen that the shielding layers are twisted together and then simply covered with tape.
If the split screen and the main screen are insulated, the split screen can be grounded at one end in the control room, while the main screen can be grounded at both the meter side and the control room side. If they are not insulated, it is possible to ground them at one end on the control room side or at one end on the meter side, with the control room side remaining ungrounded