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BSI PD IEC TR 60890:2022

BSI PD IEC TR 60890:2022

$198.66

A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation

Published By Publication Date Number of Pages
BSI 2022 60
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms and definitions
11 4 Verification conditions
5 Calculation method
5.1 Assumptions made in this calculation
12 5.2 Necessary information
5.3 Calculation procedure
5.3.1 General
5.3.2 Determination of the effective cooling surface Ae of the enclosure
5.3.3 Determination of the internal temperature-rise Δt0,5 of the air at mid-height of the enclosure
13 5.3.4 Determination of the internal temperature-rise Δt1,0 of air at the top of the enclosure
5.3.5 Characteristic curve for temperature-rise of air inside enclosure
14 Figures
Figure 1 – Temperature-rise characteristic curve for enclosures with Ae exceeding 1,25 m2
15 5.4 Maximum internal air temperature limits
6 Further considerations
6.1 General
6.2 Guidance on the effects of an uneven power distribution
Figure 2 – Temperature-rise characteristic curve for enclosures with Ae not exceeding 1,25 m2
16 6.3 Guidance on the additional temperature-rise effect due to solar radiation
17 7 Evaluation of the design
Tables
Table 1 – Method of calculation, application, formulas and characteristics
18 Table 2 – Symbols, units and designations
19 Table 3 – Surface factor b according to the type of installation
Table 4 – Factor d for enclosures without ventilation openings and with an effective cooling surface Ae > 1,25 m2
Table 5 – Factor d for enclosures with ventilation openings and an effective cooling surface Ae > 1,25 m2
20 Figure 3 – Enclosure constant k for enclosures without ventilation openings, with an effective cooling surface Ae > 1,25 m2
Table 6 – Equation for Figure 3
21 Figure 4 – Temperature distribution factor c for enclosures without ventilation openings and with an effective cooling surface Ae > 1,25 m2
Table 7 – Equations for Figure 4
22 Figure 5 – Enclosure constant k for enclosures with ventilation openings and an effective cooling surface Ae > 1,25 m2
Table 8 – Equations for Figure 5
23 Figure 6 – Temperature distribution factor c for enclosures with ventilation openings and an effective cooling surface Ae > 1,25 m2
24 Figure 7 – Enclosure constant k for enclosures without ventilation openings and with an effective cooling surface Ae ≤ 1,25 m2
Table 9 – Equations for Figure 6
25 Figure 8 – Temperature distribution factor c for enclosures without ventilation openings and with an effective cooling surface Ae ≤ 1,25 m2
Table 10 – Equation for Figure 7
26 Table 11 – Equation for Figure 8
27 Figure 9 – Calculation of temperature-rise of air inside enclosures
28 Annexes
Annex A (informative) Examples for the calculation of the temperature-rise of air inside enclosures
A.1 Example 1
Figure A.1 – Example 1, calculation for an enclosure with exposed side faces without ventilation openings and without internal horizontal partitions
30 Figure A.2 – Example 1, calculation for a single enclosure
31 A.2 Example 2
Figure A.3 – Example 2, calculation for an enclosure for wall-mounting with ventilation openings
32 Figure A.4 – Example 2, calculation for one enclosure half
34 Figure A.5 – Example 2, calculation for an enclosure for wall-mounting with ventilation openings
35 Annex B (informative) Guidance on the effects of an uneven power distribution
B.1 Horizontal partition
B.2 Calculation of internal air temperature-rise for assemblies with ventilation openings with even power distribution and less than 50 % perforation in horizontal partitions
Figure B.1 – Examples of assemblies with horizontal partitions
36 B.3 Calculation of internal air temperature-rise with an uneven power distribution
Figure B.2 – Temperature-rise verification of a higher-power circuit
37 Annex C (informative) Guidance on the additional temperature-rise effect due to solar radiation
C.1 General
C.2 Solar radiation phenomena
Figure C.1 – Solar radiation phenomena
38 C.3 Solar radiation – consequences for thermal calculation
Figure C.2 – Interpolation curve
Table C.1 – Approximate solar absorption radiation coefficients (according to colour)
39 C.4 Solar radiation of enclosures with air ventilation openings
40 Annex D (informative) Guidance on the effect of different enclosure materials, construction and finishes
D.1 General
D.2 Validity criteria
D.3 Material of enclosure
D.4 Results
41 Figure D.1 – Results of comparison tests
42 Annex E (informative) Guidance on the effects of different natural ventilation arrangements
Figure E.1 – Examples of crossing diagonal installation
43 Figure E.2 – Effect of additional filters
44 Annex F (informative) Guidance on forced ventilation management
F.1 General
F.2 Forced ventilation installation system
F.3 Installation considerations
45 Figure F.1 – Examples of forced ventilation arrangements
46 Annex G (informative) Power loss values calculation
G.1 General
G.2 Power losses of low-voltage switchgear and controlgear
G.3 Power losses of conductors connecting low-voltage switchgear and controlgear
47 G.4 Power losses of busbars
G.5 Power losses of electronic devices
48 Annex H (informative) Guidance on the impact of an adjacent wallon the assembly cooling surfaces
Figure H.1 – Wall-mounted assembly
49 Figure H.2 – Floor-standing assembly
50 Annex I (informative) Operating current and power loss of copper conductors
51 Table I.1 – Operating current and power loss of single-core copper cables with a permissible conductor temperature of 70 °C (ambient temperature insidethe enclosure: 55 °C)
52 Table I.2 – Reduction factor k1 for cables with a permissible conductor temperature of 70 °C (extract from IEC 60364-5-52:2009, Table B.52.14)
53 Table I.3 – Operating current and power loss of bare copper bars with rectangular cross-section, run horizontally and arranged with their largest face vertical, for DC and AC frequencies 16 2/3 Hz, 50 Hz to 60 Hz (ambient temperature inside the enclosure: 55 °C, temperature of the conductor 70 °C)
54 Table I.4 – Factor k4 for different temperatures ofthe air inside the enclosure and/or for the conductors
55 Annex J (informative) Guidance to magnetic and eddy-current power losses
Figure J.1 – Power losses distribution for differentgland plates with the same rating
56 Annex K (informative) Forced ventilation airflow calculation
K.1 General
57 K.2 Ventilation airflow calculation
Table K.1 – Factor k for altitudes above sea level
59 Bibliography

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BSI PD IEC TR 60890:2022
$198.66