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BSI PD CLC IEC/TR 62271-307:2019

BSI PD CLC IEC/TR 62271-307:2019

$198.66

High-voltage switchgear and controlgear – 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 including 52 kV

Published By Publication Date Number of Pages
BSI 2019 52
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This Part of IEC 62271, which is a Technical Report, refers to prefabricated metal-enclosed and solid-insulation enclosed (both hereinafter called enclosed) switchgear and controlgear assemblies for alternating current of rated voltages above 1 kV and up to and including 52 kV as specified in IEC 62271-200 and IEC 62271-201, and to other equipment included in the same enclosure with any possible mutual influence.

This Technical Report may be used for the extension of the validity of type tests performed on one test object with a defined set of ratings to another switchgear assembly of the same family with a different set of ratings or different arrangements of components. It supports the selection of representative test objects composed of functional units of a family of switchgear and controlgear aimed at the optimization of type tests in order to perform a consistent conformity assessment.

This Technical Report utilises a combination of sound technical and physical principles, manufacturer and user experience and calculations to establish guidance for the extension of validity of type tests, covering various design and rating aspects.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 1 General
1.1 Scope
1.2 Normative references
2 Terms and definitions
14 3 Use of extension criteria
3.1 General
15 3.2 Parameters for extension criteria
3.3 Use of calculations
3.3.1 General
Tables
Table 1 – Examples of design parameters
16 3.3.2 Temperature rise calculations
3.3.3 Electric field calculations
3.3.4 Mechanical stress calculations
3.3.5 Short-circuit current calculations
17 3.3.6 Internal arc pressure rise calculations
3.4 Information needed for extension of type test validity
4 Application of extension criteria
4.1 Dielectric tests
18 4.2 Temperature rise tests
Table 2 – Extension criteria for dielectric withstand performance
19 Table 3 – Extension criteria for temperature rise performance
20 4.3 Mechanical tests
4.4 Short-time and peak withstand current tests
Table 4 – Extension criteria for mechanical performance
21 4.5 Making and breaking tests
Table 5 – Extension criteria for short-time and peak withstand current performance
22 4.6 Internal arc fault tests
4.6.1 General
4.6.2 Extension criteria with respect to design
Table 6 – Extension criteria for making and breaking capacity
23 4.6.3 Extension criteria with respect to ratings and installation conditions
Table 7 – Extension criteria for internal arc fault withstand performance
24 5 Extending the validity of type tests
5.1 General
Table 8 – Extension criteria for internal arc fault classification with respect to installation conditions
25 5.2 Extension of validity of a test report to other functional units (situation a)
Figures
Figure 1 – Extension of validity of one test report; situation a)
26 5.3 Validation of a family by selection of test objects (situation b)
5.3.1 General
5.3.2 Mapping of the family
Figure 2 – Validation of a family by selection of appropriate test objects; situation b)
27 5.3.3 Specification of test objects
5.4 Validation of an assembly by existing test reports (situation c)
28 5.5 Validation of a design modification (situation d)
Figure 3 – Validation of actual assembly with existing test reports; situation c)
29 Annex A (informative) Rationale for the extension criteria
A.1 General
A.2 Dielectric tests
A.2.1 General
A.2.2 Clearances (Items 1 and 2)
A.2.3 Insulating supports and material (Items 3 and 4)
30 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.3 Temperature rise tests
A.3.1 General
31 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)
32 A.3.5 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)
33 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 (Item 13 and 14)
34 A.3.12 Insulating material in contact with conductors (Item 15)
A.4 Mechanical tests
A.4.1 General
A.4.2 Shutter systems (Item 1)
35 A.4.3 Contacts of removable parts (Item 2)
A.4.4 Interlocking systems (Items 3 and 4)
A.5 Short-time and peak withstand current tests
A.5.1 General
36 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)
37 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
A.6.1 General
38 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)
39 A.7 Internal arc fault tests
A.7.1 General
A.7.2 Clearance between phases and to earth (Items 1 and 2)
A.7.3 Compartment volume (Item 3)
40 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)
41 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
A.8.1 General
A.8.2 Rated arc fault current and duration (items 1 and 2)
A.8.3 Rated voltage (item 3)
42 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)
43 Annex B (informative) Examples for the extension of validity of type tests
B.1 General
B.2 Design modification of a cable terminal in air insulated switchgear (AIS)
Figure B.1 – Cable terminals in the connection compartment of air insulated switchgear
44 B.3 Design modification of an AIS bus riser functional unit by adding current transformers
Table B.1 – Affirmation of extension criteria with respect to dielectric withstand performance of a functional unit
45 Figure B.2 – Addition of block-type current transformers into the bus riser functional unit of air insulated switchgear
Table B.2 – Affirmation of extension criteria with respect to short-time current withstand performance of a functional unit
46 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 (GIS) to functional units with larger width
Figure B.3 – Special type of key-lock as replacement for a standard key-lock in the door of air insulated switchgear
47 Figure B.4 – Front view and top cross sectional view of a combinationof functional units making up a ring-main unit
48 B.6 Extension of a family of gas insulated switchgear (GIS) by a functional unit
Table B.3 – Affirmation of extension criteria with respectto temperature rise performance of a ring-main-unit
49 Figure B.5 – Cross-section of two different functional units of GIS
Table B.4 – Affirmation of extension criteria with respect to internal arcclassification of a GIS circuit-breaker compartment
51 Bibliography

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BSI PD CLC IEC/TR 62271-307:2019
$198.66