BSI PD IEC TR 62271-312:2021
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High-voltage switchgear and controlgear – Guidance for the transferability of type tests of high-voltage/low-voltage prefabricated substations
| Published By | Publication Date | Number of Pages |
| BSI | 2021 | 64 |
This document refers to high-voltage / low-voltage prefabricated substations (hereinafter prefabricated substations) as specified in IEC 62271-202:2014.
This document, among other options as agreed between manufacturer and user, can be used for the transferability of type tests performed on one or more prefabricated substations with a defined set of ratings and arrangement of components to another prefabricated substation with a different set of ratings or different arrangement of components. It supports the selection of appropriate representative test objects for that purpose in order to optimize the type testing procedure for a consistent conformity assessment.
This document utilises a combination of sound technical and physical principles, manufacturer and user experience and mutually agreed upon methods of calculation to establish pragmatic guidance for the transferability of type test results, covering various design and rating aspects.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 8 | FOREWORD |
| 10 | 1 Scope 2 Normative references |
| 11 | 3 Terms and definitions |
| 13 | 4 Use of transferability criteria 4.1 General |
| 14 | 4.2 Design parameters for transferability criteria 4.3 Use of calculations 4.3.1 General Tables Table 1 – Examples of design parameters |
| 15 | 4.3.2 Temperature rise calculations 4.3.3 Electric field calculations 4.3.4 Electromagnetic field calculations 4.3.5 Mechanical stress calculations 4.3.6 Short-circuit current calculations |
| 16 | 4.3.7 Internal arc calculations 4.4 Information needed for transferability of type test results |
| 17 | 5 Application of transferability criteria 5.1 General 5.2 Temperature rise tests Table 2 – Transferability criteria for temperature rise performance |
| 18 | 5.3 Dielectric tests |
| 19 | 5.4 Electromagnetic field tests Table 3 – Transferability criteria for dielectric withstand performance |
| 20 | Table 4 – Transferability criteria for electromagnetic field performance |
| 21 | 5.5 Mechanical tests Table 5 – Transferability criteria for the mechanical strength of the enclosure |
| 23 | 5.6 Short-time withstand current and peak withstand current tests Table 6 – Transferability criteria for short-time and peak withstand current performance |
| 24 | 5.7 Internal arc tests |
| 25 | Table 7 – Transferability criteria for internal arc fault withstand performance |
| 26 | 6 Transferability of type test reports 6.1 General 6.2 Transferability of a type test report to another prefabricated substation (situation a)) |
| 27 | 6.3 Validation of a substation design by existing type test reports (situation b)) Figures Figure 1 – Transferability of one type test report |
| 28 | 6.4 Validation of a design modification (situation c)) Figure 2 – Validation of a prefabricated substation by existing test reports |
| 29 | Annex A (informative)Rationale for the transferability criteria A.1 General A.2 Temperature rise A.2.1 Layout and enclosure |
| 30 | Figure A.1 – Different examples of non-walk-in type-tested prefabricated substationand related prefabricated substation under consideration |
| 31 | Figure A.2 – Different examples of walk-in type-tested prefabricated substationand related prefabricated substation under consideration Table A.1 – Material thermal conductivity |
| 32 | A.2.2 Ventilation openings (items 2.1, 2.2, 2.3 and 2.4 of Table 2) A.2.3 Distances between ventilation openings and power transformer (items 3 and 5 of Table 2) Figure A.3 – Types of ventilation opening designs |
| 33 | Figure A.4 – Distance from air inlet and air outlet ventilation openings Figure A.5 – Difference in height between power transformerand air outlet ventilation openings |
| 34 | A.2.4 Clearance between low-voltage-switchgear and controlgear and the power transformer (item 4 of Table 2) A.2.5 Power transformer insulation type (item 6 of Table 2) A.2.6 Power transformer total losses (item 7 of Table 2) A.2.7 Current of the low-voltage circuit (items 8 and 9 of Table 2) Figure A.6 – Clearance between low-voltage-switchgearand controlgear and the power transformer |
| 35 | A.3 Dielectric A.3.1 General A.3.2 Clearances (items 2 and 3 of Table 3) A.3.3 Insulating supports and material (items 4 and 5 of Table 3) A.3.4 Live parts (items 6 and 7 of Table 3) |
| 36 | A.4 Electromagnetic field A.4.1 General A.4.2 Substation layout and distance from components to external surfaces of the enclosure (items 1 and 2 of Table 4) |
| 37 | Figure A.7 – Prefabricated substation not acceptable alternative layouts |
| 38 | A.4.3 Rated voltages (item 3 of Table 4) A.4.4 Rated normal currents (item 4 of Table 4) Figure A.8 – Distances from main components to external surfaces of the enclosure |
| 39 | A.4.5 Rated frequency (item 5 of Table 4) A.4.6 Permeability and conductivity of the enclosure material(s) (items 6 and 12 of Table 4) Figure A.9 – Frequency influence on magnetic field Figure A.10 – Magnetic field behaviour under shielded technologies |
| 40 | A.4.7 Interconnections (items 7, 8 and 9 of Table 4) |
| 41 | A.4.8 Power transformer type of insulation (item 10 of Table 4) Figure A.11 – Example of magnetic field for different distributionsof phase currents in a three-phase interconnection havingthe same geometry and number of cables per phase |
| 42 | A.4.9 Distance between main circuit phases of the low-voltage switchgear and controlgear (item 11 of Table 4) A.5 Mechanical stress A.5.1 General A.5.2 Common design parameters to be assessed for the key components |
| 43 | Figure A.12 – Examples of different door designs Figure A.13 – Examples of different roof designs |
| 44 | A.5.3 Considerations for different enclosure materials, fasteners and reinforcements (items 1, 2, 3 and 4 of Table 5) |
| 45 | A.6 Short-time withstand current and peak withstand current A.6.1 General A.6.2 Rated short-time and peak currents (items 1 and 2 of Table 6) A.6.3 Rated duration of short-circuit (item 3 of Table 6) A.6.4 Centre distance between phase conductors (item 4 of Table 6) A.6.5 Conductors (items 5, 9 and 11 of Table 6) |
| 46 | A.6.6 Insulating conductor supports (items 6, 7 and 8 of Table 6) A.6.7 Type of high-voltage and low-voltage terminations (item 10 of Table 6) A.6.8 Temperature class of insulating material in contact with conductors (item 12 of Table 6) A.7 Internal arc A.7.1 General |
| 47 | A.7.2 Rated arc fault current, arc fault peak current and arc fault duration (items 1 and 2 of Table 7) A.7.3 High-voltage switchgear family (item 3 of Table 7) |
| 48 | A.7.4 Layout of the prefabricated substation (item 4 of Table 7) A.7.5 Expansion volumes (items 5, 6 and 7 of Table 7) Figure A.14 – Different size of prefabricated substations with same layout |
| 50 | Figure A.15 – Gas flow in a non-walk-in type and walk-in type prefabricated substations with separate high-voltage switchgear compartment Figure A.16 – Gas flow in a non-walk-in type and walk-in type prefabricated substations without separate high-voltage switchgear compartment |
| 51 | Figure A.17 – Gas flow in a walk-in type prefabricated substation with high-voltage switchgear compartment without gas flow cooling device Figure A.18 – Gas flow in a walk-in type prefabricated substation with high-voltage switchgear compartment and high-voltage switchgear and controlgear with integrated gas flow cooling device |
| 52 | Figure A.19 – Gas flow in a walk-in type prefabricated substation and high-voltage switchgear and controlgear with integrated gas flow cooling device without separate high-voltage switchgear compartment |
| 53 | A.7.6 Cross-section of ventilation openings (item 8 of Table 7) A.7.7 Design, position, cross-section of the cooling device(s) and gas flow (item 9 of Table 7) Figure A.20 – Transferability according to volume-criteria items 5, 6 and 7 of Table 7 |
| 54 | Figure A.21 – Layers with different transmittancefor a multi-layer gas flow cooling device |
| 55 | A.7.8 Distances between high-voltage switchgear and controlgear assembly and the prefabricated substation enclosure (walls and roof) (item 10 of Table 7) Figure A.22 – Top view of a prefabricated substation designwith different gas flow cooling device arrangements Figure A.23 – Top view of one basic substation design with different positions of high-voltage switchgear and controlgear within the high-voltage switchgear compartment |
| 56 | A.7.9 Mechanical strength of the enclosure (item 11 of Table 7) A.7.10 The shortest path length of hot gases in the last compartment to the closest ventilation opening before leaving the substation (item 12 of Table 7) A.7.11 Type of high-voltage interconnection and electrical protection of the circuit (items 13 and 14 of Table 7) Figure A.24 – Prefabricated substations with different lengthof hot gases flow path with regard to ventilation openings |
| 58 | Annex B (informative)Collection of design parameters for the assessmentof transferability of type test results B.1 General B.2 Information needed for the assessment of the temperature-rise test Table B.1 – Information needed for the assessment of temperature-rise test |
| 59 | B.3 Information needed for the assessment of the dielectric test |
| 60 | B.4 Information needed for the assessment of the electromagnetic field test Table B.2 – Information needed for the assessment of dielectric test Table B.3 – Information needed for the assessment of electromagnetic field test |
| 61 | B.5 Information needed for the assessment of the mechanical stress test B.6 Information needed for the assessment of the short-circuit current test Table B.4 – Information needed for the assessment of mechanical test |
| 62 | B.7 Information needed for the assessment of the internal arc test Table B.5 – Information needed for the assessment of short-circuit current test Table B.6 – Information needed for the assessment of internal arc test |
| 63 | Bibliography |
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BSI PD IEC TR 62271-312:2021
High-voltage switchgear and controlgear – Guidance for the transferability of type tests of high-voltage/low-voltage prefabricated…
