Qhov kev thov ntau ntxiv rau lub zog tau ua rau kev siv ntau yam thev naus laus zis hauv kev tsim hluav taws xob. Ib qho kev siv thev naus laus zis no yog High-voltage direct tam sim no (HVDC) lub zog xa hluav taws xob. Nws yog ib txoj hauv kev tshiab los xa cov hluav taws xob hluav taws xob mus ntev nrog kev poob qis ntawm lub zog. Cov tshuab no tso cai rau kev xa cov hluav taws xob ntau dhau qhov kev ncua deb, kov yeej cov kev txwv ntawm cov kab sib txuas AC. Lub 450 thiab 600 kVdc bushings yog cov khoom tseem ceeb hauv high-voltage direct tam sim no (HVDC) fais fab kis. Cov tshuab no feem ntau siv rau kev xa hluav taws xob hla kev deb thiab submarine interconnections. Cia peb tshuaj xyuas cov kev ntsuam xyuas yav dhau los, hloov lawv mus rau cov ntsiab lus ntawm high-voltage DC:
Rwb thaiv tsev Resistance Measurement:
Qhov kev ntsuam xyuas no tseem ceeb dua nyob rau hauv DC systems vim qhov kev siv hluav taws xob tas li. Qhov kev sim yuav suav nrog kev ntsuas tam sim no ntawm qhov sib txawv voltage. Qhov tseem ceeb: Nws yog ib qho tseem ceeb los tiv thaiv cov rwb thaiv tsev tsis ua haujlwm nyob rau hauv kev ntxhov siab tas mus li.
Dielectric Loss Factor (tanδ) thiab Capacitance:
Nyob rau hauv CC, lub hom phiaj yog ntau dua ntawm capacitance thiab tsis kam tshaj li cov tsoos tanδ. Kev ntsuas capacitance pab nrhiav kev hloov pauv ntawm cov qauv ntawm cov rwb thaiv tsev. Qhov tseem ceeb: Pab hauv kev ntsuam xyuas kev ncaj ncees ntawm DC nyob rwb thaiv tsev.
SF6 Gas Pressure Test:
Nws tseem ceeb heev vim tias SF6 tseem ceeb sib npaug rau DC kev sib cais. Nws tuaj yeem suav nrog kev ntsuas roj purity ntxiv vim muaj kev ntxhov siab tsis tu ncua. Qhov tseem ceeb: Ua kom muaj kev saib xyuas ntawm cov khoom insulating nyob rau hauv qhov tsis tu ncua DC voltage.
Kev ntsuas ntawm CT Polarity thiab Ratio:
Nyob rau hauv DC systems, tam sim no transformers yog hloov los ntawm tam sim no transducers. Lub hom phiaj yog nyob ntawm qhov tseeb ntawm kev ntsuas tam sim no.
Qhov tseem ceeb: Qhov tseem ceeb rau kev saib xyuas tam sim no hauv HVDC systems.
Kev soj ntsuam ntawm Secondary Circuits:
Xws li kev txheeb xyuas ntawm DC-kev ntsuas tshwj xeeb thiab kev tswj hwm lub tshuab. Nws tuaj yeem suav nrog kev tshuaj xyuas cov hloov pauv thiab HVDC tiv thaiv kab ke.
Qhov tseem ceeb: Ua kom muaj kev ua haujlwm raug ntawm HVDC tswj thiab kev tiv thaiv kab ke.
Kev ntsuas ntawm Secondary Winding Resistance:
Hauv DC, kev tsom mus rau ntau dua ntawm lub zog ntawm cov conductors thiab kev sib txuas. Qhov no suav nrog kev ntsuas hluav taws xob poob ntawm cov ntsiab lus sib txawv hauv qhov system.
Qhov tseem ceeb: Ua kom muaj txiaj ntsig hauv DC fais fab kis.
Kev txheeb xyuas ntawm Grounding ntawm Lub Tsev:
Txawm tias tseem ceeb tshaj nyob rau hauv DC systems vim muaj peev xwm rau electrolytic corrosion. Nws tuaj yeem suav nrog kev sim rau cov dej xau hauv av.
Qhov tseem ceeb: Tiv thaiv kev nyab xeeb thiab kev puas tsuaj los ntawm DC cov dej ntws tawm.
SF6 Ceev Relay Calibration:
Zoo ib yam li AC, tab sis nrog qhov tseem ceeb ntawm cov lus teb sai dua. Nws tuaj yeem suav nrog kev ntsuas kub ntxhov vim muaj cua sov tsis tu ncua.
Qhov tseem ceeb: Qhov tseem ceeb rau kev tswj xyuas kev ncaj ncees ntawm cov rwb thaiv tsev hauv kev ua haujlwm tas mus li.