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BSI PD IEC/TR 62271-305:2009

BSI PD IEC/TR 62271-305:2009

$102.76

High-voltage switchgear and controlgear – Capacitive current switching capability of air-insulated disconnectors for rated voltages above 52 kV

Published By Publication Date Number of Pages
BSI 2009 22
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This technical report applies to high-voltage air-insulated disconnectors for rated voltages above 52 kV. The report describes the capacitive current switching duty and provides guidance on laboratory testing to demonstrate the switching capability. Air-insulated disconnectors equipped with auxiliary interrupting devices are included under this scope.

NOTE For manually operated disconnectors, the in-service safety of the operator should be considered and it should be recognized that the results of the switching tests described herein (performed using motor-operated disconnectors) are not necessarily representative of the performance of such disconnectors in actual service. Due diligence should be exercised if the switching tests indicate that prolonged arc durations are probable.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
5 FOREWORD
7 1 Scope
2 Normative references
3 Terms and definitions
4 Background and purpose
5 Switching tests
5.1 Arrangement of the disconnector for tests
8 5.2 Earthing of the test circuit and disconnector
5.3 Test frequency
5.4 Test voltage
5.5 Test current
5.6 Test circuit
9 5.7 Tests
Figures
Figure 1 – Test circuit in principle for capacitive current switching
Tables
Table 1 – Test tolerances
10 5.8 Test reports
11 Annex A (informative) Analysis
Figure A.1 – Basic capacitive current switching circuit
12 Figure A.2 – Test oscillograms for current of 2 A and CS/CL ratios of 2,5 (Trace A) and 0,04 (Trace B)
14 Figure A.3 – Circuit for restriking current calculation
16 Annex B (informative) Capacitive charging currents
Table B.1 – Capacitive charging currents at 245 kV and below
Table B.2 – Capacitive charging currents at 300 kV to 550 kV
Table B.3 – Capacitive charging currents at 800 kV to 1 200 kV
17 Annex C (informative) Test circuits
Figure C.1 – Basic capacitive current switching circuit
18 Figure C.2 – Alternative test circuit
19 Figure C.3 – Restriking and integrated currents (in A and As, respectively) for the basic (dashed) traces) and alternative circuits (drawn traces). Horizontal axis in ms

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BSI PD IEC/TR 62271-305:2009
$102.76