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IEC/TR 62271-307 Ed. 2.0 en:2024 High-voltage switchgear and controlgear - Part 307: Guidance for the extension of validity of type tests of AC metal and solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and incl, 2024
- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Use of extension criteria [Go to Page]
- 4.1 General
- 4.2 Parameters for extension criteria
- 4.3 Use of calculations [Go to Page]
- 4.3.1 General
- 4.3.2 Temperature rise calculations
- 4.3.3 Electric field calculations
- 4.3.4 Mechanical stress calculations
- 4.3.5 Short-circuit current calculations
- 4.3.6 Internal arc pressure rise calculations
- 4.4 Information needed for extension of type test validity
- 4.5 Extension of validity when using different insulating gas or gas mixture
- 5 Application of extension criteria [Go to Page]
- 5.1 General
- 5.2 Dielectric tests
- 5.3 Continuous current tests
- 5.4 Mechanical tests
- 5.5 Short-time withstand current and peak withstand current tests
- 5.6 Making and breaking tests
- 5.7 Internal arc fault tests [Go to Page]
- 5.7.1 General
- 5.7.2 Extension criteria with respect to the switchgear and controlgear design
- 5.7.3 Extension criteria with respect to ratings and installation conditions
- 6 Typical processes for the application of the extension of the validity of type tests [Go to Page]
- 6.1 General
- 6.2 Extension of validity of a test report to other functional units (situation a)
- 6.3 Validation of a family by selection of test objects (situation b) [Go to Page]
- 6.3.1 General
- 6.3.2 Mapping of the family
- 6.3.3 Specification of test objects
- 6.4 Validation of an assembly by existing test reports (situation c)
- 6.5 Validation of a design modification (situation d)
- Annex A (informative) Rationale for the extension criteria [Go to Page]
- A.1 General
- A.2 Dielectric tests [Go to Page]
- A.2.1 General
- A.2.2 Clearances (items 1 and 2)
- A.2.3 Insulating supports and material (items 3 and 4)
- A.2.4 Live parts (items 5 and 6)
- A.2.5 Open contact gap and isolating distance (items 7 and 8)
- A.2.6 Minimum functional pressure for insulation (item 9)
- A.2.7 Minimum ambient temperature in service (item 10)
- A.2.8 Minimum dielectric properties of insulation gas or gas mixture (item 11)
- A.3 Continuous current tests [Go to Page]
- A.3.1 General
- A.3.2 Centre distance between phase conductors (item 1)
- A.3.3 Phase to earth distance (item 2)
- A.3.4 Enclosure and compartment volume (item 3)
- A.3.5 Pressure (density) of insulating gas (item 4)
- A.3.6 Conductors (items 5 and 6)
- A.3.7 Conductor joints and connections (items 7, 8 and 9)
- A.3.8 Ventilation area of partitions and enclosure (item 10)
- A.3.9 Power dissipation of components (item 11)
- A.3.10 Insulating barriers (Item 12)
- A.3.11 Insulating coating of conductors and enclosures (items 13 and 14)
- A.3.12 Insulating material in contact with conductors (item 15)
- A.3.13 Minimum thermal performance of gas or gas mixture (item 16)
- A.4 Mechanical tests [Go to Page]
- A.4.1 General
- A.4.2 Shutter systems (item 1)
- A.4.3 Contacts of removable parts (item 2)
- A.4.4 Interlocking systems (items 3 and 4)
- A.5 Short-time withstand current and peak withstand current tests [Go to Page]
- A.5.1 General
- A.5.2 Centre distance between phase conductors (item 1)
- A.5.3 Conductors (items 2, 5 and 6)
- A.5.4 Insulating conductor supports (items 3 and 4)
- A.5.5 Insulating material in contact with conductors (item 7)
- A.5.6 Enclosure, partitions or bushings (item 8)
- A.5.7 Contacts of removable part (item 9)
- A.6 Making and breaking tests [Go to Page]
- A.6.1 General
- A.6.2 Clearance between phases and to earth (items 1 and 2)
- A.6.3 Enclosure and compartment volume (item 3)
- A.6.4 Insulating gas (item 4)
- A.6.5 Conductors (items 5 and 6)
- A.6.6 Insulating supports (items 7, 8 and 9)
- A.6.7 Dielectric withstand capability (item 10)
- A.7 Internal arc fault tests [Go to Page]
- A.7.1 General
- A.7.2 Clearance between phases and to earth (items 1 and 2)
- A.7.3 Compartment volume (item 3)
- A.7.4 Pressure of insulating gas (item 4)
- A.7.5 Material in the region of arc initiation (items 5, 6, 7 and 8)
- A.7.6 Pressure relief opening devices (items 9, 10 and 11)
- A.7.7 Enclosure and compartments (items 12, 13, 14 and 15)
- A.8 Rationale for extension criteria with respect to arc fault ratings and installation conditions [Go to Page]
- A.8.1 General
- A.8.2 Rated arc fault current and duration (items 1 and 2)
- A.8.3 Rated voltage (item 3)
- A.8.4 Rated frequency (item 4)
- A.8.5 Arrangement of assembly (items 5, 6 and 7)
- A.8.6 Indoor or outdoor installation (item 8)
- A.8.7 Type of accessibility (item 9)
- A.8.8 Accessible sides (item 10)
- Annex B (informative) Examples for the extension of validity of type tests [Go to Page]
- B.1 General
- B.2 Design modification of a cable terminal in air insulated switchgear and controlgear (AIS)
- B.3 Design modification of an AIS bus riser functional unit by adding current transformers
- B.4 Design modification of a key-lock in the door of a functional unit of AIS
- B.5 Extension of a ring-main unit (RMU) of gas insulated type to functional units with larger width
- B.6 Extension of a family of gas insulated switchgear and controlgear (GIS) by a functional unit
- B.7 Extension of a GIS with insulation gas-A to insulation gas-B
- Bibliography
- Figures [Go to Page]
- Figure 1 – Example for extension of validity of test report for dielectric testing with regard to different construction design variants and insulation gases of the same family of switchgear and controlgear
- Figure 2 – Extension of validity of one test report – Situation a)
- Figure 3 – Validation of a family by selection of appropriate test objects – Situation b)
- Figure 4 – Validation of actual assembly with existing test reports – Situation c)
- Figure 5 – Validation of a design modification – Situation d)
- Figure B.1 – Cable terminals in the connection compartment of AIS
- Figure B.2 – Addition of block-type current transformers into the bus riser functional unit of AIS
- Figure B.3 – Special type of key-lock as replacement for a standard key-lockin the door of AIS
- Figure B.4 – Front view and top cross-sectional view of a combination of functional units making up a RMU
- Figure B.5 – Cross-section of two different functional units of GIS
- Tables [Go to Page]
- Table 1 – Examples of design parameters
- Table 2 – Extension criteria for dielectric withstand tests
- Table 3 – Extension criteria for continuous current performance
- Table 4 – Extension criteria for mechanical performance
- Table 5 – Extension criteria for short-time and peak withstand current performance
- Table 6 – Extension criteria for making and breaking capacity
- Table 7 – Extension criteria for internal arc fault withstand performance
- Table 8 – Extension criteria for internal arc fault classification with respect to installation conditions
- Table B.1 – Affirmation of extension criteria with respect to dielectric withstand performance of a functional unit
- Table B.2 – Affirmation of extension criteria with respect to short-time current withstand performance of a functional unit
- Table B.3 – Affirmation of extension criteria with respectto continuous current performance of a RMU
- Table B.4 – Affirmation of extension criteria with respect to internal arc classification of a GIS circuit-breaker compartment
- Table B.5 – Reference test results for lightning impulse voltage tests
- Table B.6 – Reference test results for power-frequency voltage tests
- Table B.7 – Extension criteria for dielectric withstand tests [Go to Page]
