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PD IEC TR 62271-312:2021 High-voltage switchgear and controlgear - Guidance for the transferability of type tests of high-voltage/low-voltage prefabricated substations, 2021
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- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Use of transferability criteria [Go to Page]
- 4.1 General
- 4.2 Design parameters for transferability criteria
- 4.3 Use of calculations [Go to Page]
- 4.3.1 General
- Tables [Go to Page]
- Table 1 – Examples of design parameters [Go to Page]
- 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
- 4.3.7 Internal arc calculations
- 4.4 Information needed for transferability of type test results
- 5 Application of transferability criteria [Go to Page]
- 5.1 General
- 5.2 Temperature rise tests
- Table 2 – Transferability criteria for temperature rise performance
- 5.3 Dielectric tests
- 5.4 Electromagnetic field tests
- Table 3 – Transferability criteria for dielectric withstand performance
- Table 4 – Transferability criteria for electromagnetic field performance
- 5.5 Mechanical tests
- Table 5 – Transferability criteria for the mechanical strength of the enclosure
- 5.6 Short-time withstand current and peak withstand current tests
- Table 6 – Transferability criteria for short-time and peak withstand current performance
- 5.7 Internal arc tests
- Table 7 – Transferability criteria for internal arc fault withstand performance
- 6 Transferability of type test reports [Go to Page]
- 6.1 General
- 6.2 Transferability of a type test report to another prefabricated substation (situation a))
- 6.3 Validation of a substation design by existing type test reports (situation b))
- Figures [Go to Page]
- Figure 1 – Transferability of one type test report
- 6.4 Validation of a design modification (situation c))
- Figure 2 – Validation of a prefabricated substation by existing test reports
- Annex A (informative)Rationale for the transferability criteria [Go to Page]
- A.1 General
- A.2 Temperature rise [Go to Page]
- A.2.1 Layout and enclosure
- Figure A.1 – Different examples of non-walk-in type-tested prefabricated substationand related prefabricated substation under consideration
- Figure A.2 – Different examples of walk-in type-tested prefabricated substationand related prefabricated substation under consideration
- Table A.1 – Material thermal conductivity [Go to Page]
- 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
- 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 [Go to Page]
- 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
- A.3 Dielectric [Go to Page]
- 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)
- A.4 Electromagnetic field [Go to Page]
- 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)
- Figure A.7 – Prefabricated substation not acceptable alternative layouts [Go to Page]
- 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 [Go to Page]
- 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 [Go to Page]
- A.4.7 Interconnections (items 7, 8 and 9 of Table 4)
- 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 [Go to Page]
- A.4.9 Distance between main circuit phases of the low-voltage switchgear and controlgear (item 11 of Table 4)
- A.5 Mechanical stress [Go to Page]
- A.5.1 General
- A.5.2 Common design parameters to be assessed for the key components
- Figure A.12 – Examples of different door designs
- Figure A.13 – Examples of different roof designs [Go to Page]
- A.5.3 Considerations for different enclosure materials, fasteners and reinforcements (items 1, 2, 3 and 4 of Table 5)
- A.6 Short-time withstand current and peak withstand current [Go to Page]
- 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)
- 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 [Go to Page]
- A.7.1 General
- 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)
- 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
- 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
- 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
- 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 [Go to Page]
- 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
- Figure A.21 – Layers with different transmittancefor a multi-layer gas flow cooling device [Go to Page]
- 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 [Go to Page]
- 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
- Annex B (informative)Collection of design parameters for the assessmentof transferability of type test results [Go to Page]
- 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
- B.3 Information needed for the assessment of the dielectric test
- 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
- 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
- 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
- Bibliography [Go to Page]
