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  • Advanced Workshop on Standard of Lightning Protection Technology

    Advanced Workshop on Standard of Lightning

    Protection Technology

    Application of two port SPDsHow By Alain Rousseau

    pp p

    two ports SPD can solve coordination problem and provide enhance protection?

    y

    IEC SC37A WG3 Convener, CLC 37A

    October 12, 2011Bon-Garden Business Hotel,

    Shenzhen, China

    SPDSPD

    Chairman, SEFTIM ChairmanIEC SC37A WG320111112

    Lightning Commission

    ,CLC 37A ,SEFTIM

    Lightning CommissionChina Meteorological Society

  • Advanced Workshop on Standard of Lightning Protection Technology

    Application of two port SPDsHow two ports SPD can solve coordination problemports SPD can solve coordination problem

    and provide enhance protection?

    Al i RAlainRousseaualain.rousseau@seftim.fr

    2/17

  • Introduction SPDshaveaUPdefinedatitsterminals

    may differs from what appears at equipments terminalsmaydiffersfromwhatappearsatequipmentsterminals. thisisexplainedinIEC6164312and623054.

    Parametersthathaveinfluenceare: leadlengthfromactiveconductorstoSPD,fromSPDtog ,itsdisconnector(ifany)andfromdisconnectortogroundterminalg

    distancebetweentheSPDandtheequipmenttobeprotectedprotected

    technologyoftheSPD(1port:parallelSPD,2ports:parallel SPD + filtering)parallelSPD+filtering)

  • Withstandvoltages

    We can assume that Uw is the same between active cables and PE and active cables themselves because no other available data

  • Withstandvoltagesandimmunitylevels(EMC)

  • Withstandvoltagesandimmunitylevels

  • Comparison between IEC 623054ComparisonbetweenIEC623054andIEC6164312:Up/fp/

    Annex D of IEC 62305-4

  • ComparisonbetweenIEC623054andIEC6164312:Up/f

    UP/f between the live conductorUP/f between the live conductor and the bonding bar is higher than the protection level Up of the SPD, because of the e S , because o einductive voltage drop U at the bonding conductors

    Namely, the partial lightning current flowing through the SPD induces additional voltage into the loop on the protected side of the circuit following the SPD. Therefore the maximum voltage endangering the connected equipment can be considerably higher then the protection level UP f th SPD

    Annex D of IEC 62305-4

    UP of the SPD.

  • ComparisonbetweenIEC623054andIEC6164312:oscillations

    Annex D of IEC 62305-4

  • ComparisonbetweendraftIEC623054andIEC6164312:oscillations

    V lt i d t th i t illVoltage experienced at the equipment will depend on the frequency of the surge and the length of the conductors. Depending on the value of r oscillations between L and Cthe value of r, oscillations between L and C can increase the voltage at the equipment terminals u up to ku.

    Voltage at the terminals of equipment canVoltage at the terminals of equipment can reach double the voltage at the SPD terminals. In case of 2 ports SPD using a filter the steepness is reduced and thefilter, the steepness is reduced and the oscillation phenomenon can be reduced too

    Annex K of IEC 61643-12

  • Oscillationphenomenonversusdi t b t SPD d i tdistancebetweenSPDandequipment

    Computer simulation (thanks to ABB)

    3 000K

    4.000KSIMUL OSCILLATION PHENOMENUM.CIR

    The red line is representing the

    2.000K

    3.000K

    845.999n,2.244K

    representing the voltage at the source terminals

    0.000K

    1.000K 80.000u,926.589 The green line is representing the

    id l lt t0.000u 16.000u 32.000u 48.000u 64.000u 80.000u

    -1.000K

    B v(1) (V)(2) (V)

    Left Right Delta Slope2.244K 926.589 -1.318K -16.649M1 500K 130 721 1 500K 18 954M

    residual voltage at the capacitor terminals

    T (Secs)

    v(2) (V) v(1) (V)

    845.999n 80.000u 79.154u 1.000

    1.500K -130.721m -1.500K -18.954M2.244K 926.589 -1.318K -16.649M

    terminals

  • Oscillationphenomenonversusdi t b t SPD d i tdistancebetweenSPDandequipment

    Variarion of added voltage (1,5kV with rise time of 0,6s) depending on distance measurement

    0 180%90%

    100%

    y = 0,1x

    30%40%50%60%70%

    %

    0%10%20%30%

    0 1 2 3 4 5 6 7 8 9 10 11

    Residual voltage can be gradually doubled from 0 to 10m if voltage steepness is not decreased by filter.

  • Oscillationphenomenondependingonthefronttimeoftheimpulse voltage: Typical voltage rise for MOV SPDsimpulsevoltage:TypicalvoltageriseforMOVSPDs

    residual voltage under 5 kA current

    impulse (8/20)

    Zoom of the front waveZoom of the front wave

    U/t= 12 36 kV/sU/t= 12,36 kV/s

    I 3 5 10 20 kA8/20u/t 13,06 12,36 16,90 20,27 kV/s

  • Oscillation phenomenon depending onOscillationphenomenondependingonthefronttimeoftheimpulsevoltage

    1.600K

    2.400KSIMUL OSCILLATION PHENOMENUM.CIR

    10.339u,1.558K3.000K

    4.000KSIMUL OSCILLATION PHENOMENUM.CIR

    0.000K

    0.800K

    1.000K

    2.000K1.213u,2.061K

    0.000u 16.000u 32.000u 48.000u 64.000u 80.000u-1.600K

    -0.800K

    B (1) (V)Left Right Delta Slope

    80.000u,-785.440

    1 558K 785 440 2 344K 33 642M

    0.000u 16.000u 32.000u 48.000u 64.000u 80.000u-1.000K

    0.000K

    Left Right Delta Slope

    80.000u,-767.610

    B v(1) (V)

    T (Secs) v(2) (V)

    1.558K -785.440 -2.344K -33.642M

    10.339u 80.000u 69.661u 1.0001.500K 964.332m -1.499K -21.519M

    B v(1) (V)

    T (Secs) v(2) (V)

    2.061K -767.610 -2.829K -35.903M

    1.213u 80.000u 78.787u 1.0001.500K 143.540m -1.500K -19.036M

    u/t=1 5kV/s u/t=0 15kV/sIn case of slow rise time of the residual voltage (provided by a

    2 port SPD for instance) even if the distance is as long as

    u/t=1,5kV/s u/t 0,15kV/s

    2 port SPD for instance) even if the distance is as long as 50m, the voltage is far from to be doubled.

  • TWO PORTS SPDsTWOPORTSSPDs

    TypicaltwoportSPDs:

    Left:PSEESoul(ABB)( )

    Right:AO ADEE

  • TWO PORTS SPDsTWOPORTSSPDs

    Left product : two groups of varistor based SPDsLeftproduct:twogroupsofvaristorbasedSPDsdecoupledbyinductances

    Ri h d f Di d MOV i l iRightproduct:frontstage:DiodeorMOV,isolatingtransformer,filter

  • CONCLUSIONSCONCLUSIONSInstallation rules for SPDs are generally considering a 10 mInstallationrulesforSPDsaregenerallyconsideringa10mdistancebetweenSPDandequipmenttobeprotectedasthe limit above which the equipment is not properlythelimitabovewhichtheequipmentisnotproperlyselected.

    Calculations have shown that 10 m can be reduced to onlyCalculationshaveshownthat10mcanbereducedtoonlyafewmetersdependingonequipmenttype,SPDtypeandfront of the wavefrontofthewave.

  • CONCLUSIONSCONCLUSIONSOn the reverse the two ports SPD with their capability toOnthereverse,thetwoportsSPD,withtheircapabilitytoreducethesteepnessattheoutputoftheSPD,aremuchmore flexible regarding installations rules and in particularmoreflexibleregardinginstallationsrulesandinparticulardistancebetweenSPDandequipmenttobeprotected.

    At the origin IEC 61643 11 draft standard has consideredAttheoriginIEC6164311draftstandardhasconsideredinclusionofanewparameterbeingthesteepnessofthewave at the output of the SPDwaveattheoutputoftheSPD.

    Thisisnowdonein6164311Ed1.Letsuseit!

  • Th kThank you

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