Mangahas ka bang iwasan ing grounding kapamilatan ning pamag install kareng safety barriers? Deting adwang areni e la kapilan man single choice questions!
"Malyari la bang manatiling alang ground deng Control Cables keng Cabinet Room kareng Safety Barriers? Deng mapilan maniwala la na "kareng safety barriers para keng surge protection ampo interference isolation, ing pamag-ground kareng control cable shielding layers malyari yang gawan casual." Makanyan man, deng relevant standards malino lang sasabyan deng requirements ampo paralan para keng grounding kareng shielding layers da reng control cabine keng cabinet room. Ing grounding ning shielding layer da reng control cables keng kilub ning cabinet room makasuglung ya keng presensya da reng safety barriers?Ngeni, linawan mi ing sabla tungkul keng pamag-ground kareng shielding layers da reng control cables keng cabinet room.”
Ing grounding ning shielding layer da reng control cables keng cabinet roommumuna yang magsilbi para labanan ing pamakialam, a maki makatuking partikular a obra ampong kapagnasan:
1.Pamag-iwas king external electromagnetic interference: Nung maka-ground ya, ing shielding layer gagawan neng "barrier," a mag-direct kareng currents a ibat kareng external electromagnetic fields papunta king yatu, inya sa’t e la milub deng interference signals king cable at makaapektu king katuliran da reng transmitted control signals.
2.Ing pamag-iwas kareng internal signals na maka-interfere kareng external devices: Deng signals a mipadala kilub ning cable malyari lang mag-generate electromagnetic fields. Ing grounded shielding layer malyari nong pigilan deng fields a reni para e la mikalat palual, para makaiwas keng pangasira da reng makapadurut a gamit.
3.Proteksyunan ing kagamitan ampo ing kaligtasan da reng tau: nung ing shielding layer ali ya maka-ground, ing static buildup o abnormal a boltahe malyari yang maging sangkan ning pamag-malfunction da reng kagamitan. Ing pamag-ground lilipat ne ing sobrang charges keng gabun, at babawasan na ing safety risks.
Deng susi a standard requirements ampo gawi para keng pamag-ground kareng shielding layers da reng control cables keng cabinet room:
1.GB 50093-2013 "Code para keng Construction ampo Quality Acceptance ning Automation Instrumentation Engineering
10.2.10 Ing shielding layer da reng instrument cables ampo wires dapat maka-ground ya keng control room panel/cabinet side. Ing shielding layer ning pareung circuit dapat atin yang mapanalig a electrical continuity at e ya dapat paburen a makalutang o maka-ground paulit-ulit.
10.2.11 Ing armor da reng armored cables dapat yang maka-ground para proteksyunan ing adwa nang wakas.
10.2.12 Kareng intermediate junction boxes, ing primary cable's subdivided shielding layers dapat makakonekta ya kareng katumbas a secondary cable shielding layers gamit ing terminals. Deng miyayaliwang shielding layers dapat lang mikakawani a alang pamisanmetung ampo dapat lang maka-insulate.
10.2.13 Nung atin lang anti-interference requirements, deng spare cores kareng multi-core cables dapat lang i-ground keng metung a punto. Para kareng shielded cables, deng spare cores ampo ing shielding layer dapat maka-ground la keng metung a gilid.
2.SH/T 3081-2019 "Design Code para keng Instrument Grounding keng Petroleum ampo Chemical Industries"
APPENDIX A
(Normative Appendix)
Shielded cable grounding map
Ing shielding layer ning multi-core main cable keng kabilugan a screen division patuloy yang makasuglung keng cabinet room antimo ing akakit keng Figure A-1. Ing shielding layer ning multi-core main cable keng kabilugan a screen division makasegment ya at makakonekta ya keng junction box ampo keng cabinet room antimo ing akakit keng Figure A-2. Ing shielding layer ning multi-core main cable keng kabilugan a screen division patuloy yang makasuglung keng cabinet room antimo ing akakit keng Figure A-3. Ing shielding layer ning multi-core main cable keng kabilugan a screen division makasegment ya at makakonekta ya keng junction box ampo keng cabinet room antimo ing akakit keng Figure A-4.
Ing wiring instructions para keng shielding layer keng Figures A-1 anggang A-4 makakit ya keng Table A. Ing branch cable manibat keng field instrument papunta keng junction box metung yang single shielded cable o metung yang armored shielded cable. Deng armored cables a lulub keng junction box gagamit lang cable joints a maki grounding connections para keng madaling grounding connections. Deng shielding layers ning balang branch cable keng Appendix Figures A-2 anggang A-4 dapat lang makakonekta keng junction box gamit deng terminals o busbars.
Deng shielding layers da reng branch cables ampo reng main cables malyari lang ikonekta ampo i-ground keng control room cabinet, o kaya miyayaliwa keng junction box ampo keng control room cabinet a mag-ground keng section.
Ing shielding layer ning branch cable keng Figure A-1 makasuglung ya keng kilub a shielding layer ning main cable, at ing shielding layer ning branch cable keng Figure A-3 makasuglung ya keng shielding layer ning main cable keng junction box. Ing ganap a makasuglung a shielding layer maka-ground ya keng control room cabinet keng metung a wakas.
Ing shielding layer da reng branch cables keng Figures A-2 ampo A-4 maka-ground ya keng metung a wakas ning junction box, kabang ing kilub a shielding layer ning main cable keng Figure A-2 ampo ing shielding layer ning main cable keng Figure A-4 maka-ground ya keng metung a wakas ning control room cabinet.
Ing armor layer ning main cable maka-ground ya kareng adwang wakas agpang keng Article 4.4.1, ampo ing metal cable tray maka-ground ya kareng adwang wakas agpang keng Article 4.1.8, a paulit-ulit a grounding balang 30m.
Table A Wiring Method para keng Shielding Layer
Paralan ning pamagkonekta | Junction box | Aparadul | ||||
Branch cables manibat kareng on-site instruments papunta kareng junction boxes | Multi core main cable para keng kabilugan a screen ampo split screen | |||||
Figure A-1 | Ing shielding layer makasuglung ya keng main cable kapamilatan da reng terminal at ali ya maka-ground | Ing armor layer o metal protective tube makasuglung ya keng grounding busbar para proteksyunan | Ing shielding layer makasuglung ya keng shielding layer ning branch cable kapamilatan da reng terminal at ali ya maka-ground | Ing kabilugan a shielding layer makasuglung ya keng protective ground kapamilatan ning grounding busbar | Ing shielding layer makasuglung ya keng working ground kapamilatan ning grounding busbar | Ing kabilugan a shielding layer makasuglung ya keng protective ground kapamilatan ning grounding busbar |
Figure A-2 | Ing shielding layer makasuglung ya keng protective ground kapamilatan ning grounding busbar | Ing armor layer o metal protective tube makasuglung ya keng grounding busbar para proteksyunan | Bakanting shielding layer | Ing kabilugan a shielding layer makasuglung ya keng protective ground kapamilatan ning grounding busbar | Ing shielding layer makasuglung ya keng working ground kapamilatan ning grounding busbar | Ing kabilugan a shielding layer makasuglung ya keng protective ground kapamilatan ning grounding busbar |
| Junction box | Aparadul | ||||
Branch cables manibat kareng on-site instruments papunta kareng junction boxes | Multi core main cable para keng kabilugan a screen ampo split screen | |||||
Figure A-3 | Ing shielding layer makasuglung ya keng main cable's overall shielding layer kapamilatan da reng terminal at ali ya maka-ground | Ing armor layer o metal protective tube makasuglung ya keng grounding busbar para proteksyunan | Ala yang miyayaliwang shielding layer | Ing kabilugan a shielding layer makasuglung ya keng shielding layer ning branch cable kapamilatan da reng terminal at ali ya maka-ground | Ala yang miyayaliwang shielding layer | Ing kabilugan a shielding layer makasuglung ya keng working ground kapamilatan ning grounding busbar |
Figure A-4 | Ing shielding layer makasuglung ya keng protective ground kapamilatan ning grounding busbar | Ing armor layer o metal protective tube makasuglung ya keng grounding busbar para proteksyunan | Ala yang miyayaliwang shielding layer | Ing kabilugan a shielding layer alang laman | alang split screen tapping layer | Ing kabilugan a shielding layer makasuglung ya keng working ground kapamilatan ning grounding busbar |
Engineering practical application ampo on-site real-life a larawan:
Ing grounding ning shielding layer keng kilub ning control cable keng cabinet room ala yang kaugnayan nung safety barriers (Isolation Barriers, surge protectors, atbp.) maka-configure la. Maliban mu nung atin yang espesyal a kailangan ing dokumentu ning pamagdisenyu, kailangan lang mahigpit a ipatupad agpang kareng specifications.
