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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

    1/68

    =

    4844893 0579680 417

    .

    .

    RAPPORT

    TECHNICAL

    TECHNIQUE -TYPE

    3

    REPORT

    -

    TYPE

    3

    CE1

    IEC

    890

    1987

    AMENDEMENT 1

    AMENDMENT 1

    1995-02

    Amendement 1

    Mthode de dtermination par extrapolation

    des chauffements pour les ensembles

    d appareillage basse tension

    drivs de srie (EDS)

    Amendment 1

    A method

    of

    temperature-rise assessment

    by extrapolation for partially-tested

    assemblies (PTTA) of low-voltage

    switchgear and controlgear

    0

    CE1

    1995

    Droits

    de reproduction

    rservs

    - opyright -

    ail ngMs

    reserved

    BureauCentrai de iaCommission Eledrotechnique Intematinale 3. rue

    de Varem Genve, Wisse

    F

    ommission Electrotechnique internationale

    internat ional Eiectrotechnicai Commission

    Memaywponwfi

    3newrp0rex"uecna~

    HoM~cwn

    COD

    P R I X

    PRICE

    COD

    E

    Pourpk. wircafa@e on

    vigueur

    f o r p r i c e , see

    currenf

    atdogus

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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    4 8 4 4 8 9 3 0 5 7 9 6 8 3

    353

    m

    DIS

    - 2 -

    890 amend. 1 0 CE1 : 995

    Rapport de vote

    AVANT-PROPOS

    17D(SEC)143

    Le prsent amendement a t tabli par le sous-comit 17D: Ensembles

    dappareillage basse tension, du comit dtudes 17 de la

    CEI:

    Appa-

    reil ag

    e.

    17Df148IRVD

    Le texte de cet amendement est issu des documents suivants:

    Le rapport de vote indiqu dans le tableau

    mation sur le vote ayant abouti

    lapprobation

    ci-dessus donne toute infor-

    de cet amendement.

    INTRODUCTION

    Les articles

    de

    cet amendement compltent,

    articles correspondants du rapport technique

    modifient ou remplacent les

    890 de la

    CE1

    - l redition

    (1 987): Mthode de dtermination par extrapolation des chauffem ents pour

    les ensembles d appareil lage

    basse tension drivs de srie

    EDS).

    Lorsquil ny a pas darticle ou de paragraphe correspondant dans le prsent

    amendement, larticle ou le paragraphe de la CE1 890: 1987 et de son

    corrigendum de mars 1988 sappliquent sans modification.

    Page 8

    5.1

    Informations ncessaires

    Ajouter un nouveau tiret:

    - puissance dissipe effective P,) par

    les

    conducteurs selon lannexe

    B.

    Supprimer la dernire phrase de la note.

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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    4844893 0577682 2 T

    890

    Amend. 1 O IEC:

    1995

    - 3 -

    FOREWORD

    This amendment has been prepared by sub-committee 17D: Low-voltage

    switchgear and controlgear assemblies, of IEC technical committee 17:

    Switchgear and controlgear.

    The text

    of

    this amendment is based on the following documents:

    DIS I

    R e p o r t o n vo t i n g

    I

    Full information on the voting for the approval

    of

    this amendment can be

    found in the report on voting indicated in the above table.

    INTRODUCTION

    The clauses of this amendment supplement, modify or replace the corres-

    ponding clauses in the technical report IEC

    890 -

    1st edition 1987 ) :

    A

    method of temperature-rise assessment by extrapolation

    for

    partially type-

    tested assemblies PTTA)

    of

    low-voltage switchgear and controlgear.

    Where there is no corresponding clause or subclause in this amendment,

    the clause or subclause

    of

    IEC 890:

    1987

    and its corrigendum of March

    1988 apply without modifications.

    Page 9

    5.1 Necessary in ormation

    Add a new indent:

    - Effective power losses P,) of conductors according to annex B.

    Delete the last sentence of the note.

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    4844893

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    126

    4-

    890

    Amend.I CEI:1995

    Page

    49

    Ajouter, aprs l'annexe A, la nouvelle annexe

    B

    comme suit:

    Annexe B

    .

    Courant de fonct ionnement et puissances dissipes par les conducteurs

    Les puissances dissipes donnes dans les tableaux B.1, B.2 et B.3 sont fondes

    sur:

    -

    la temprature maximale permise du conducteur

    la temprature de l'air autour de conducteur

    l'intrieur de l'enveloppe

    - le courant de fonctionnement

    Les conducteurs montrs dans les tableaux

    B.1

    et

    B.3

    sont de plus bass sur les

    sections donnes dans la CE1

    947-1

    "Rgles gnrales" pour les conducteurs en

    cuivre.

    Pour une charge de conducteur plus faible, l'quation suivante peut tre utilise:

    P

    = puissances dissipes en watts par mtre (W/m)

    i

    = courant du conducteur (charge)

    In

    = courant de fontionnement

    Pn = pertes effectives In

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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    9

    4 8 4 4 8 9 3

    0 5 7 9 b 8 4

    Ob2

    9

    890 Amend.

    1O

    IEC:1995 -5-

    Page49

    Add, after annex A, the new annex B as follows:

    ,

    Annex

    B

    Operating current and pow er losses of c onduc tors

    The power losses given in tables

    B.1, B.2

    and B.3 are based on:

    - maximum permissible conductor temperature

    -

    operating current

    -

    air temperature inside the enclosure around the conductor

    The conductors shown in tables

    B.l

    and

    8.3

    are additionally based on

    cross-

    sections which are given in IEC

    947-1

    "General rules" for Cu-conductors.

    At a lower conductor loading the following equation may be used:

    P = power losses in watts per metre (W/m)

    I

    = conductor current (loading)

    In

    = operating current

    Pn

    =

    power losses at

    In

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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    4 8 4 4 8 9 1 0579685 T T 9

    890

    Amend. 1

    O

    CEI:I

    9956-

    A i Wim

    12 j 2.1

    Tableau B.1:

    Courant de fonctionnement et puissances dissipes par

    les

    conducteurs isols

    A

    i Wim A

    f Wim A

    f Wlm

    8 f

    0,9 12

    f

    2,l 8 i 0,9

    -

    1

    Cross-

    cectior

    (Cu)

    -

    -

    2

    m

    1,s

    295

    4

    6

    10

    16

    25

    35

    50

    70

    95

    120

    150

    185

    240

    300

    -

    25

    i

    3,4.

    32 f 3,7

    2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 11 12 I 13

    Temprature maximale permise du conducteur 70 C

    18 i 1,8 25 3,4 20 2.2

    23

    i

    1,9 32

    i

    3,7 25

    i

    2,3

    TemDrature de

    48 i 4,8

    64 f 5,6

    85

    i

    6,3

    104 7,5

    35C

    5 5 C

    31

    2,O

    50

    5,2

    32

    f

    2,l

    42

    2,4

    65

    i 5,8

    50 3,4

    55

    i 2,6

    85

    i

    6,3

    65

    i

    3,7

    67

    f 3,l

    115

    f

    7,9

    85 f 5,O

    12 i 2,l : 0,9

    130

    i

    7,9

    161

    i

    8,4

    I

    11

    17

    I

    2,5

    i 1,l

    22 : 2,6 14 1,l

    28

    i

    2,8 18

    .

    1,2

    85

    i

    3,4

    150

    10,s

    115 i 6,2

    105

    3,6

    175

    i 9,9

    149 i 7,2

    'air autour des conducteurs I'ir

    192 i 8,7

    226 i 9,6

    275 11,7

    295 10,9

    c

    C

    Q)

    c

    c

    O

    C

    6

    W

    c

    3

    5

    P

    E

    s

    125

    f 3,7

    225

    11,9

    175 i 7,2

    147

    f 4,l

    250

    i 11,7

    210 f 8,3

    167

    i 4,3

    275

    f

    11,7

    239 i

    8,8

    191

    i

    4,6

    350 f

    15,4

    273

    i

    9.4

    rieur de l'enveloppe

    Diam.

    0,12

    2,6

    i 1.2 1,7 f 0,5 0,4

    0.14

    2,9 1,3

    1,9 0,6

    0,20 3.2

    i 1,l

    2,l i 0,5 -

    0.30 4,4

    i

    1,4 2,9 i 0,6 0,6

    0,34 4,7

    i

    1,4 3,l 0,6 0,6

    0150 6,4 f 1,8 4,2 f. 0.8 0,8

    0.56 i 1,6

    f

    0.7

    0.75 8,2

    i

    1.9 5,4

    t

    0.8

    1,0

    1,OO 9,3

    f

    1,8 6,l

    i 0,8

    -

    -

    0,22 3,6 i 1,3 2,3 i 0.5 0,5

    35C I 55C I 35C

    i '

    55C

    l'quation suivante peut tre utilise:

    I

    P

    =

    PJ-y

    I"

    P

    =

    puissances dissipes en Wim

    I

    = courant du conducteur (charge)

    I, = courant de fontionnement

    P, =

    pertes effectives

    I,

    G

    v)

    Q)

    9

    Q

    .-

    .-:

    8

    .-:

    U

    v)

    c

    o

    3

    a

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    c

    E

    Q)

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    c

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    c

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    a

    P

    e

    a

    K

    i

    Qi

    c

    C

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    c

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    C

    3

    .-

    P

    E

    o

    20

    i

    3,5 12

    i

    1,3 20

    i 3,5

    I 12

    i

    1,3

    347

    i 12,O

    I

    225

    i 5 , O

    I 400

    f 15,9

    I 322

    i

    10,3

    400

    i

    13.2 260

    i

    5.6

    I

    460

    i

    17.5 371

    i

    11.4

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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    =

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    =

    890

    Amend.1

    O

    IEC:l995 -7-

    55 C 35 C 55 C

    Table B.1:

    Operating current and power losses of insulated conductors

    35

    C

    -

    1

    :rocs-

    iection

    (Cu)

    -

    -

    195

    2.5

    4

    6

    10

    16

    25

    35

    50

    70

    95

    120

    150

    185

    240

    300

    -

    -

    -

    A

    f Wlrn

    8 f 0,9

    11 f 1,l

    .2 I 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 I 11 I 12 I 13

    Maximum permisible conductor temperature 70

    C

    I

    A Wlrn A i Wlm A f

    Wim

    20 3,5 12 i 1,3

    20 f 3.5

    12 f 2,l 8

    f

    0,9 12 f 2,l

    35 "C

    e :

    o ' i g

    e r , ;

    v)

    .- i o

    Z O j Q I

    i 6

    A Wlm

    12 f 2,l

    17 i 2,5

    22

    i

    2,6

    28 i 2,8

    38

    i

    3,O

    52 3,7

    c : L

    O f P

    14 f 1,l

    18

    i

    1,2

    25

    3,4

    18

    1,8

    25 i 3,4

    32

    f

    3,7

    23

    1,9

    32 3,7

    c

    c

    al

    o

    er,

    c

    5

    .-

    E

    QI

    Q

    O

    34 i 1,6

    f i

    3

    8

    3

    v)

    QI

    O

    -

    O

    Q

    64

    5,6

    42

    i 2,4

    65

    i

    5,8

    85

    i 6,3

    55

    f 2,6

    85 i 6,3

    c

    QI

    o

    er,

    c

    5

    -

    e

    a

    Q

    O

    104

    7,5

    130 i 7,9

    161 f 8,4

    192 f 8,7

    226

    f

    9,6

    275 f 11,7

    295

    f

    10,9

    6

    v)

    3

    O

    -

    8

    3

    O

    P

    67

    i 3,l

    115 i 7,9

    85

    3,4 150

    10,5

    105

    i

    3.6

    175 i

    9,9

    125

    3,7

    225

    i

    11,9

    147

    i 4,l

    250 i 11,7

    167 i

    4,3

    275

    i

    11,7

    191

    i 4,6

    350 i

    15,4

    c

    Q)

    o

    er,

    c

    5

    e

    -

    QI

    Q

    O

    347

    i

    12,O

    400 f 13,2

    n

    (v

    v)

    3

    O

    Q>

    O

    P

    -

    L

    3

    225

    i 5,O

    400 i 15,9

    260

    'i 5,6

    460 17,5

    Diam.

    0,12 2,6

    i

    1,2 1,7 i 0,s 0,4

    0,14 2,9

    i 1,3 1,9

    f 0,6 -

    0,20 3,2

    i

    1,l 2,l

    0,s -

    0,22

    3,6 i 1,3

    2,3

    i

    0,5

    0 3

    0,30 4,4

    1,4

    2,9

    i 0,6 0,6

    following equation may be used:

    I

    P

    =

    P,(-)*

    I n

    P

    = power losses in Wlm

    25 1,3 48

    i

    4,8 31 2,O

    50

    5,2

    0,34

    0,56

    0.75

    1,00

    4,7 i 1,4 3,l

    i

    0,6 0,6

    I =

    conductor current (loading)

    6,4

    'i 0,8 0,8 I,, = operating current

    i 0,7

    1,6

    - P, =

    power losses at

    I

    ,2 :

    i

    1,8

    8,2 i 1,9 5,4 i

    0,8

    1,0

    9.3

    i 1.8

    6,l

    f

    0,8

    55 "C

    c

    c :

    : f i

    e r , i v)

    .-

    i o

    8

    L m

    z i g

    g i s

    c i

    0 : O

    O f P

    A f Wlrn

    8

    f

    0,9

    12 1,3

    25 i 2,3

    32

    i

    2,l

    50 i 3,4

    65 i 3,7

    85

    5,O

    115 i 6,2

    749

    i

    7,2

    175

    f

    7,2

    210

    i

    8,3

    239

    i

    8,8

    273 9,4

    322 'i 10,3

    371

    i

    11.4

    20

    i

    2.2

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    CEI:1995

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    9/68

    4844891 0579688 708

    890

    Amend.

    1

    O

    IEC:

    1995

    -9-

    f

    a

    a

    u

    C

    C

    C

    c

    r

    C

    6

    C

    1,25 m2.

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    1

    0.9

    *

    *-

    *-

    0.8

    ol

    C

    O

    o

    p

    2 0 7

    O

    o

    C

    W

    -

    0.6

    0.5

    0.4

    0.3

    0.2

    0.1

    O

    O

    1

    2 3

    4

    5

    6

    7

    8

    9 10

    11 12

    Effective cooling surface A, (m2)

    394187

    FIG. .

    - Enclosure constant k for enclosures without ventilation openings, with an effective

    cooling surface

    A ,

    > 1.25mz.

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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  • 7/25/2019 IEC 890 (1987 Amd 1 1995-02)

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    890 O IEC 1987

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    W

    (o

    m

    -

    e

    -

    @

    3

    m

    O

    o

    C

    W

    -

    -

    2

    c

    C

    u

    L

    O

    c

    L

    -

    U

    L

    O

    +

    L

    .-

    U

    II Il II

    -

    emperature distribution factor c

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    I E C 890 8 7

    4 8 4 4 8 7 1 0 0 8 8 9 7 8 I

    -

    6 - 890 O CE1 1987

    Section des orifices dentre dair

    ) (crn2)

    m

    *f

    La

    ectio n des orifice s de sortie dair sera au moin s

    1,1

    foiscelle d es or ifices dentre dair.

    396/87

    FIG.^.

    -

    Constante d enveloppe

    k

    pour enveloppes avec orifices de ventilation et avec une

    surface effective de refroidissem entA ,

    >

    1,25 m2.

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    -

    890 O IEC 1987

    -

    7

    -

    t

    c

    K

    o

    v)

    C

    O

    o

    c

    Cross-section of air inlet openings '1 (crn2)- '14

    ')The cross-sectionofthe corresponding air outlet openin gs should be at least 1.1 times that

    of

    the air inlet openin gs.

    396187

    FIG.

    .

    -

    Enclosure constant k for enclosures with ventilation ope ning s and a n effective cooling

    surface A,

    >

    1.25 m2.

    _

    I E C

    8 7 0

    8 7 W

    4 8 4 4 8 9 3 0 0 8 8 9 7 9 3 ~

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    45/68

    -

    8

    - 890

    O

    CE1 1987

    al

    U

    Facteur

    hauteurlbase

    P

    2.2

    2 I

    2

    1.9

    1.8

    1.7

    1.6

    1.5

    1.4

    1.3

    1.2

    1.1

    O 100

    200 300 400

    500 600 700

    Section d es orif ices dentre dair

    )

    (cm)

    397187

    1)

    La ection des orifices de sortie dair sera au m oins

    1,l

    fois celle des orifices dentre dair.

    2)

    Facteur haute udba se, voir paragraphe

    5.2.3.

    FIG. .

    -

    Facteur d e rpartition de temprature

    c

    pour env eloppes a vec orifices de ventilation et

    une surface effective de refroidissementA,

    >1,25

    m2.

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    Heightlbase

    factor

    P'

    10

    2.2

    t

    2.1

    o 2

    8

    .+ 1.9

    e

    1.8

    2

    1.7

    ?

    1.6

    .w

    o

    (o

    c

    O

    3

    .-

    +

    +

    i-

    1.5

    1.4

    1.3

    1.2

    1.1

    1

    O

    100

    200

    300

    400 5 0 0 600 700

    Cross-section

    of

    air inlet openings '1

    (crn2)

    ')The cross-sectionof the corresponding air outlet open ings should be at least 1 .1 times that of the air inlet opening s.

    2) Height/base factor, see Sub-clause

    5.2.3.

    FIG. . - Temperature distribution factor c for enclosures with ventilation openings and an

    effective cooling surfaceA,

    >

    1.25 m2.

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    47/68

    -IC

    a,

    Q

    Q

    O

    C

    a,

    a,

    i

    (o

    v)

    c

    -

    J

    B

    i

    + I E C 8 7 0

    8 7 W

    4 8 4 4 8 9 3 0 0 8 8 7 8 2

    3

    - 30 - 890 O CE1 1987

    5

    4

    3

    2.5

    2

    1.5

    1

    0.8

    0.7

    0.6

    0.5

    0.05

    0.07

    0.1 0,15 0.2 0.3

    0.4

    0.5 0.7 1 1.3

    Surface effective de refroidissement A, (m2)-

    398/87

    FIG.^.

    - Constante denveloppe

    k

    pour enveloppes sans orifices de ventilation et avec une

    surface effective de refroidissementA , G 1,25 m2.

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    48/68

    I E C

    870

    87 W 4844873 0088983

    5

    U

    ~~ ~~ ~~~

    890 O I E C

    1987

    - 1 -

    0 05

    0.07

    0.1

    0.15 0.2 0.3

    0.4

    0.5 0.7 1 1.3

    Effective cooling surface A, (m2)

    398/87

    FIG.. - Enclosure constant k for enclosures without ventilation open ings

    and

    with an effective

    cooling surface

    A ,

    U

    c

    O

    .-

    c

    -

    o

    Q

    al

    U

    3

    al

    O

    L

    L

    c

    2

    FIG. . - Facteur de rpartition d e tem prature c pour enveloppes sans orifices de ventilation et

    avec une surface effective de refroidissement A , a

    1,25

    m2.

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    50/68

    1.25

    9

    c,

    c

    o

    m

    c

    O

    -J

    Lc

    .-

    +

    o

    I

    .- 1.20

    U

    3

    al

    g

    e

    io

    .w

    2

    1.15

    1.10

    1.05

    1

    O 0.5

    1

    1.5 2 2.5

    g (see

    Sub-clause 5.2.3)

    -

    99/87

    FIG. . -

    Temperature distribution factor

    c

    for enclosures without ventilation openings and with

    an effective cooling surface

    A , < 1.25 mz.

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    -

    4-

    applicables

    pour la dtermination- largeur mm

    de rchauffement profondeur mm

    890

    O C E 1

    1987

    .-

    Orifices de ventilation: oui lnon

    Nombre de sparations horizontales:

    Calcul de l'chauffement de l'air l'intrieur d'enveloppes

    Client/Installation

    Dimensions

    m x m

    2

    Partie suprieure

    Faade .

    Type d'enveloppe

    A, X

    b

    Facteur (colonne 3) x

    de surface b (colonne 4)

    suivant

    tableau

    III

    m2 m2

    3

    4 5

    Ao

    IDimensions hauteur mm I Type d'installation:

    Suprieure 1,25 m2

    Infrieure ou gale

    1,25

    mz

    Arrire

    I

    Ct gauche

    ~~ ~

    Ct droit

    A, = Z ( A , x b) = Total

    ).- (voir paragraphe

    5.2.3)

    I

    I =I =

    Orifices d'entre d'air um2

    Constante d'enveloppe k

    Facteur pour sparations horizontales d

    Puissance dissipe effectiveP W

    Facteur de rpartition de temprature c

    At1.n

    = c

    * Atn.5

    K

    Courbe caractristique:

    3

    Echauffement d e l 'air l 'intrieur

    de l 'enveloppe Ar

    400/87

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    890 O IEC 1987 -

    5 -

    Calculation of temperature rise of air inside enclosures

    Customer/plant

    Type of enclosure

    ~ ~

    Relevant height mm Type of installation:

    dimensions for

    temperature rise width mm Ventilation openings: yesho

    depth mm Number of horizontal partitions:

    :y

    according to (Column 4)

    Dimensions

    TableII 1

    m2

    2

    m x m

    5

    I - 4 III

    I 1 I

    Front

    Left-hand side

    Right-hand side

    A ,

    =

    ,Y

    ( A , x

    b)

    =

    Total

    I

    With an effective cooling surface A,

    Exceeding 1.25 mz Not exceeding 1.25 m2

    h1.35

    Ab

    =

    see Sub-clause5.2.3)

    g =

    I see Sub-clause5.2.3)

    I

    Air inlet openings cm2 I

    Enclosure constant k

    Factor for horizontal partitions

    d

    Effective power loss

    P W

    p x = p . . .

    Ato., = k

    * d

    * P x

    K

    Temperaturedistribution factor c

    Characteristic curve:

    2

    8

    1.0

    -

    o

    C

    a>

    0.75

    t

    Tempe rature rise

    of

    air inside

    enclosure

    At 400/87

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    I E C

    8 9 0

    87

    =

    4 8 4 4 8 9 1 0 0 8 8 9 8 8

    4

    - 36- 890 0 CE1 1987

    ANNEXE

    A

    EXEMPLES CHIFFRS DE DTERMINATION DE LCHAUFFEMENT

    DE LAIR LINTRIEUR DUNE ENVELOPPE

    Exemple

    I----c

    I

    I

    I

    I

    I

    I

    I

    I

    I

    I

    ,h

    ---

    -

    -

    -

    Enveloppe spare dtache sur tous les cts, sans

    orifices de ventilation et sans sparations internes

    horizontales.

    Puissance dissipe effective de lquipement

    install dans lenveloppe:

    P

    = 300 W

    3

    00

    Dimensions en millimtres

    401/87

    Conduite du calcul

    (Pour les rubriques voir formulaire, page 40, portant sur lexemple 1.)

    -

    La dtermination de la surface effective de refroidissement A , se fait selon le paragraphe

    5.2.1.

    Les surfaces lmentaires sont calcules

    partir des dimensions de lenveloppe, les

    facteurs de surface b tant obtenus du tableau III.

    Le calcul de lchauffement de lair Ato,5 seffectue suivant le paragraphe 5.2.2.

    Formule (2) de la colonne 2 du tableau I:

    Facteur

    k

    selon la colonne 7 du tableau I, avec

    A,

    >1,25 m2 selon la figure 3,

    page 22:

    Facteur

    d

    suivant la colonne 8du tableau I, avec

    A , >

    1,25 m2 selon le tableau I V

    -

    Ato,5

    k

    d Px (2)

    pour

    A, =

    6,64 m2: k

    =

    0,135

    pour nombre de sparations horizontales

    =

    O

    :

    d

    =

    1,0

    Puissance dissipe effective (telle que spcifie) P = 300 W

    Exposant x de la colonne 10 du tableau

    I,

    avec

    A,

    > 1,25 m2: x

    =

    0,804

    En reportant ces valeurs dans la formule (2) ci-dessus, on obtient le rsultat suivant:

    Ato,5 = k * d Px= 0,135 10 * 3001804

    Ato,, = 13,24

    K m

    13,2

    K

    .

    -

    Le calcul de lchauffement de lair

    At1,o

    seffectue suivant le paragraphe 5.2.3.

    Formule (3) de la colonne 3 du tableau I:

    Ati,o c Ato,5

    (3)

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    890 O IEC 1987

    -

    7

    -

    APPENDIX A

    EXAMPLES FOR THE CALCULATION OF THE TEMPERATURE RISE

    OF AIR INSIDE ENCLOSURES

    Example 1

    I

    I

    I

    I

    I

    I

    I

    I

    I

    I

    I

    -

    zontal partitions.

    Effective power loss of equipment installed in the

    enclosure:P = 300 W

    401/87

    Calculation

    (For entries see form, page 41, on example 1.)

    -

    The effective cooling surface A, is determined according to Sub-clause 5.2.1.

    The individual surfaces are calculated from the enclosure dimensions, and the surface

    factor bis taken from TableIII.

    The temperature rise of air Ato.5 is determined according to Sub-clause 5.2.2.

    Formula (2) from column 2 of Table

    I:

    Factor

    k

    according to column 7 of Table I with A ,

    >

    1.25 m2, as shown in Figure 3,

    page 23:

    Factor

    d

    according to column

    8 of

    Table

    I

    with

    A,>

    1.25 m2, as specified in

    Table I V

    Ato.5 =

    k d - PX

    (2)

    for&= 6.64m2: k = 0.135

    with number of horizontal partitions

    =

    O

    :

    d

    =

    1 O

    Effective power loss (as specified) P= 300 W.

    Exponent x from column 10 of Table I with A,

    >

    1.25 m2: x =0.804

    With these values entered into the above formula (2), the following result is

    obtained:

    ~

    Ato.5

    At05 13.24K.J 13.2K

    k d PX

    0.135 1.0 300*804

    - The temperature rise of air At1.0is determined according to Sub-clause 5.2.3.

    Formula (3) from column 3 of Table

    I:

    Ati.0

    =

    c

    Ato.5

    (3)

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    I E C

    890

    87

    W

    989q89L 0088990 2

    - 8 - 890

    O

    CE1 1987

    Facteur c selon la colonne 9 du tableau

    I,

    avec A, >1,25 m2 suivant la figure 4,

    page 24:

    La courbe

    1

    de la figure 4 donne:

    e =

    1,44

    En

    reportant cette valeur dans la formule

    (3), on

    obtient le rsultat suivant:

    Ati,o

    = c A ~ , J

    1,44 13,24

    =

    19,07 K

    M

    19,l K

    -

    La dtermination de la courbe caractristique dchauffement pour enveloppe avec

    A,> 1,25 m2 seffectue selon le paragraphe 5.2.4.1 (voir figure dans le formulaire de

    lexemple 1, page 40).

    La vrification de la conception de lquipement se fait selon larticle6.

    Ce faisant, il faudra sassurer que lappareillage

    lintrieur de lenveloppe peut fonc-

    tionner de faon satisfaisante lchauffement calcul et sous le courant assign, compte

    tenu de la temprature de lair ambiant (voir article 3, note).

    Si tel nest pas le cas, les paramtres devront tre modifis en consquence et le calcul

    devra tre repris.

    -

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    890 O IEC 1987 - 9

    -

    Factor c according to column 9 of Table I with A,

    >

    1.25

    m2,

    as shown in Figure 4,

    page 25:

    Curve 1 of Figure

    4

    follows:

    With this value entered into formula (3), the following result is obtained:

    c = 1.44

    Ati.0 =

    c

    Ato.5

    1.44 13.24= 19.07K

    19.1K

    -

    The temperature-rise characteristic curve is determined for enclosures withA, > 1.25 m2,

    in accordance with Sub-clause 5.2.4.1 (see figure in the form on example 1, page 41).

    -

    The evaluation of the design is made in accordance with Clause6.

    It

    is

    to be verified whether the equipment installed in the enclosure is capable of func-

    tioning satisfactorily at the specified currents and calculated temperature rises, consid-

    ering the ambient air temperature (see Clause3, note).

    If this is not so, the parameters will have to be changed and the calculation repeated.

    F= \.

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    -

    0 - 890 O

    CE1

    1987

    Partie suprieure

    Faade

    Arrire

    Ct gauche

    Ct droit

    I Calcul de l'chauffement de l'air l'intrieur d'enveloppes

    I

    410 OIS o/

    900 4 o, 700

    dIO x

    212

    2,200 a/

    9 A i 980

    4

    o

    x 2,2

    2 ,2 0 0 49 4 ,960

    015X

    212

    4 400

    4 9 0,

    9 9 0

    015 3 12

    A,f

    00 41

    9

    o

    990

    Ciient/inStaiiation ,Exemple

    4

    Suprieure

    I

    ,25 m2

    Type d'enveloppe

    mveloppe

    *r&

    Infrieure

    ou

    gale 1,25

    mz

    2

    00 m m

    Type d'installation: zur b u /a&&

    4 060

    m m

    Orifices de ventilation:

    pdi/non

    profondeur

    50

    a m m Nombre de sparations horizontales:

    Dimensions hauteur

    applicable

    pour la dtermination largeur

    de l'chauffement

    ~

    I35

    A b

    f = (voir paragraphe 5.2.3)

    - 2 2

    =

    S , B O

    4,o x

    0,s

    I I I

    m x m

    m z

    m z

    P

    2 3 4

    5

    g

    = (voir paragraphe 5.2.3)

    -

    -

    Orifices d'entre d'air cmz

    Constante d'enveloppe

    k

    0

    O.

    4 3 5

    Facteur pour sparations horizontales d

    Puissance dissipe effective

    P

    w

    .Il D

    306

    Courbe caractristique:

    40

    20 3 0

    Echauffernent de

    l'air

    l 'intrieur

    de l 'enveloppe At en

    K

    412 R?

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    890 O I E C 1987

    - 4 1

    -

    Calculation of the temperature rise of air inside enclosures

    Customer/piant B a n d e i I

    I Type of enclosure

    snale e K

    t/osu/ie I

    Relevant height 2 80 mm Typeofinstallation:

    befackd

    Qt fi 'Acs

    dimensions for

    temperature-rise width

    /o00

    mm Ventilation openings: d / n o

    depth 500 mm Number of horizontal partitions:

    0

    o

    c

    2

    bo

    c

    O

    O

    o

    >

    O

    I-

    -

    < *

    *

    $

    w

    A , x

    b

    Dimensions A O Surface factor

    b

    (Column 3)

    X

    according to Table (Column 4)

    I I I

    b 5 m x m m2 m2

    T O 2 1

    ./ 2 3

    4

    5

    TOP l . o x0 . s 6.50d /*4 O -700

    Front

    1.0%

    2.2

    2,200 0.9

    I.

    986

    Rear

    l.OxZ.2

    2.200

    o.

    9

    1.980

    Left-hand side

    O - 5 X Z . Z

    1.100 o. 9 o. 940

    Right-hand side

    0.5X2.2

    /. IO0 0.9 D .

    990

    I

    6.640

    ,

    = E (A,

    X

    b) = Total

    I

    With an effective cooling surface

    A, I

    Exceeding I .25 m2

    Not exceeding I

    .25

    m2

    1.35

    A b

    f = (see Sub-clause 5.2.3) g = $ (see Sub-clause 5.2.3)

    -

    5.80

    =

    -

    2.2 *35

    -

    4.0

    x

    0 c

    Air inlet openings cm2

    0

    Enclosure constant

    k

    O. I 3 5

    Factor for horizontal partitions

    d

    Effective power loss

    P

    W 3 0 0

    px

    p

    . 8 0 0

    I.

    O

    98 . 09

    I .44

    Ai0.S = k

    *

    d * Px K /3 .24 e 13.2 K

    Temperature distribution factor c

    Arl ,o= c . A & K 19.07 e

    19.1

    K

    Characteristic curve:

    Temperature rise of air inside

    enclosure At

    in

    K

    402 '87

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    Exemple 2

    En

    re1

    - 2 - 890 O CE1 1987

    ppe pour montage mural avec orifices de ventilation

    section des orifices dentre dair

    =

    1 220 cm2

    section des orifices de sortie dair = 1 800 cm2

    avec deux sparations horizontales

    lintrieur de lenveloppe. Chaque sparation hori-

    zontale, par exemple tle perfore, comporte des orifices de ventilation dont la section est

    suprieure

    50% de la section de lenveloppe.

    Puissance dissipe effective lintrieur de lenveloppe

    P =

    2 200 W.

    Orifices de sortie dair

    Sparations horizontales

    avec orifices de ven tilation,

    par exemple tle perfore

    Orifices dentre d air

    Conduite du

    calcul

    (Pour les rubriques voir formulaire, page 48, portant sur lexemple 2.)

    -

    Etant donn une surface de refroidissement de lenveloppe qui est probablement sup-

    rieure

    11,5 m2 et une largeur de lenveloppe suprieure 1,5 m, lenveloppe totale doit

    tre divise, aux fins du calcul et conformment au paragraphe 5.2, en colonnes (enve-

    loppes partielles). .Aucune subdivision constructive ntant prvue, lexemple dcrit

    prvoit, pour simplifier, une division de lenveloppe en deux colonnes gales (moitis

    denveloppe). I1 est admis que les puissances dissipes, et les orifices de ventilation sont

    rpartis de faon gale dans

    les

    moitis denveloppe, de sorte quaux fins du calcul, ils

    peuvent tre diviss par deux.

    Le

    calcul nest effectu que pour une seule moiti denveloppe.

    Le

    rsultat sapplique

    galement lautre moiti.

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    I E C

    -

    890 O IEC 1987

    -

    3

    -

    Example

    2

    Enclosure for wall-mounting with ventilation openings

    cross-section of air inlet openings = 1 220 cmz

    cross-section of air outlet openings

    =

    1 800 cmz

    with two horizontal partitions inside the enclosure. Each horizontal partition, for example

    perforated plate, has ventilation openings, the cross-sectional areas of which exceed 50% of

    the enclosure cross-section.

    Effective power loss of equipment installed in the enclosureP = 2 200

    W.

    -_

    ir outlet openings

    I

    I

    Horizonta l partitions

    wit h ventilation openings,

    for example perforated plate

    Air inlet openings

    C

    C

    c

    403/87

    Calculation

    (For entries see form on example 2, page 49.)

    -

    Given an expected cooling surface of the enclosure of more than 11.5 mz and an

    enclosure width exceeding 1.5

    m,

    the entire enclosure is to be divided, for calculation

    purposes, into sections (partial enclosures) as indicated in Sub-clause 5.2. To simplify the

    procedure, as no structural divisions are available, the entire enclosure is, in this

    example, divided into two equal sections (enclosure halves). The power losses and venti-

    lation openings are supposed to be evenly distributed in both parts (enclosure halves)

    so

    that for the calculation they are divided by two.

    The calculation is carried out for only one enclosure half, the result being applicable to

    the other half.

    ,

    -.

    .

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    I E C 8 9 0 87 E 4844873 0 0 8 8 9 9 b 3 W

    - 4 - 890 O CE1 1987

    Informations ncessaires selon le paragraphe 5.1 pour une moiti denveloppe

    1

    Moiti

    denveloppe

    C

    C

    h

    h

    Envelop pe pour montage mural avec

    orifices dentre dair

    -

    --220 -

    10 cm2

    2

    Ave c orifices de sortie dair

    -

    --oo

    -

    900

    cm2

    2

    Avec deux sparations horizontales,

    par exem ple tle perfore

    Puissance dissipe effective

    -

    2200- i

    ioow

    2

    Dimensions en millimtres

    404187

    -

    La dtermination de la surface effective de refroidissement par moiti denveloppe se fait

    selon le paragraphe 5.2.1.

    Les surfaces lmentaires sont calcules partir des dimensions de lenveloppe, le facteur

    de surface

    b

    tant obtenu du tableau III.

    Conformment au tableau III, la surface de sparation entre les deux moitis denve-

    loppe et rsultant de la division fictive nest pas prise en considration.

    Le calcul de lchauffement de lair Ato,5 seffectue suivant le paragraphe 5.2.2.

    Formule (2) de la colonne 2 du tableau I

    Facteur k selon la colonne 7 du tableau I, avec

    A,

    > 1,25 m2 selon la figure 5,

    page 26

    Ato,, = k d

    P X

    (2)

    pour une surface des orifices dentre dair de 6 10 cm2avec

    A,

    = 7,674 m2:

    dans le cas de deux sparations horizontales:

    k

    = 0,071

    Facteur d selon la colonne 8 du tableau I, avec

    A,

    > 1,25 m2selon le tableau V

    Puissance dissipe effective (telle que spcifie)

    P =

    1 100 W

    Exposant x de la colonne 10 du tableau

    I,

    avec A,

    >

    1,25 m2:

    En reportant ces valeurs dans la formule (2) ci-dessus,on obtient le rsultat suivant:

    d

    =

    1,lO

    x

    =

    0,7 15

    Ato,5

    Ato,5

    =

    11,67K.J 11,7K

    Le calcul de lchauffement de lair Atl,0 seffectue suivant le paragraphe 5.2.3.

    k d P X =

    0,071 1,lO 1 1000,715

    -

    Formule (3) de la colonne 3 du tableau I

    Ati,o = c Ato,5

    (3)

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    890

    O

    I E C 1987 - 5 -

    Necessary information according to Sub-clause 5.1 for one half of the enclosure

    l i I

    Enclosure

    half

    Enclosur e for wall-mounting with air

    inlet openings

    -7

    220-

    610 cm2

    I = 2

    I With air outlet opening s

    With two horizontal partitions,

    for

    exam ple perforated plate

    Effective power loss

    Dimensions in millimetres

    404187

    -

    The effective cooling surface of each enclosure half is determined according to Sub-

    clause 5.2.1.

    The individual surfaces are calculated from the enclosure dimensions, and the surface

    factor bis taken from Table

    III.

    The dividing surface between the two enclosure halves which has been obtained as a

    result of the fictitious division, is not taken into account in accordance with Table

    III.

    The temperature rise

    of

    air Ato.5 is determined according to Sub-clause 5.2.2.

    Formula (2) from column 2 of Table

    I

    Factor k according to column 7 of Table I and A,

    >

    1.25 m2, as shown in Figure 5,

    Ato.5 = k d P X

    (2)

    page 27,

    for 610 cm2air inlet openings and

    A, =

    7.674 m2:

    k =

    0.071

    Factor

    d

    according to column 8 of Table

    I

    and

    A,

    >

    1.25 m2

    as

    specified in Table

    V

    with two horizontal partitions:

    Effective power loss (as specified)

    P =

    1 100

    W

    Exponent

    x

    from column 10 of Table

    I

    with

    A, >

    .25 m2:

    With these values entered into the above formula (2), the following result is

    obtained:

    d

    =

    1.10

    x = 0.715

    Ato.5

    =

    k * d P X 0.071

    Ato.5 =

    11.67

    K M

    11.7 K

    1.10 1 100

    0.715

    -

    The temperature rise of air

    At1.o

    is determined according to Sub-clause 5.2.3.

    Formula

    (3)

    from column

    3

    of Table

    I

    A t i . 0

    =

    c Ato.5

    (3)

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    - 6 - 890

    O

    CE1 1987

    Facteur c selon la colonne 9 du tableau

    I,

    avec

    A, >

    1,25 m2 suivant la figure 6,

    page

    28,

    hl935 2,21935

    =

    2,50

    --

    Ab 1,45 0,8

    La figure

    6

    donne pour une superficie des orifices de ventilation de

    610

    cm2:

    c = 1,87

    En reportant ces valeurs dans la formule

    (3),

    on obtient le rsultat suivant:

    Ati ,o=

    C.

    A to,5= 1,87 1 1 , 6 7 K = 2 1 , 8 2 K ~ 2 1 , 8 K

    -

    La dtermination de la courbe caractristique dchauffement pour enveloppes avec

    A,> 1,25 m2 se fait selon le paragraphe 5.2.4.1 (voir figure dans le formulaire de

    lexemple 2, page 48).

    La vrification de la conception de lquipement se fait selon larticle6.

    Ce faisant, il faudra sassurer que lappareillage

    lintrieur de lenveloppe peut fonc-

    tionner de faon satisfaisante

    lchauffement calcul et sous le courant assign, compte

    tenu de la temprature de lair ambiant (voir article 3, note).

    Si tel nest pas le cas, les paramtres devront tre modifis en consquence et le calcul

    devra tre repris.

    -

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    890

    O

    IEC 1987 - 7 -

    Factor c according to column 9 of Table I.and A , > 1.25 m2, as shown in Figure 6,

    h1.35

    2.21.35

    =

    2.50

    =

    --

    Ab

    1.45 0.8

    Figure 6 shows that, for 610 cm2air inlet openings:

    c

    =

    1.87

    With these values entered into formula

    (3),

    the following result is obtained:

    Ati .o=~*At0.5=.87 11.67K=21.82K~21.8K

    -

    The temperature-rise characteristic curve for enclosures with A ,

    >

    1.25 m2 is determined

    according to Sub-clause 5.2.4.1 (see figure in the form on example 2, page 49).

    -

    The evaluation of the design is made in accordance with Clause 6.

    It is to be verified whether the equipment installed in the enclosure is capable of func-

    tioning satisfactorily at the specified currents and calculated temperature rises, consid-

    ering the ambient air temperature (see Clause

    3,

    note).

    If this is not

    so,

    the parameters will have to be changed and the calculation repeated.

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    I E C

    8 9 0 87

    M 4 8 4 4 8 9 1

    0 0 8 9 0 0 0

    T

    Dimensions applicables hauteur 2 66 mm

    pour la dtermination

    de l'chauffement largeur 4

    450

    mm

    d m ve/dppe profondeur 800 mm

    48

    -

    890

    O

    CE1 1987

    Typed'installation: hfmhge

    w

    Orifices de ventilation: ou

    Nombre de sparations horizontales: 2

    m X m

    2

    Y

    %

    v>

    3

    O

    m2 m2

    3 4 5

    % e r

    4?

    &

    -2

    ,?

    5

    0

    't:

    3

    Dimensions

    Facteur de surface (colonne

    3)

    X