Powell Technical Brief #85 The Application of 600 Volt Class ...
Powell Technical Brief #85 The Application of 600 Volt Class ...
Powell Technical Brief #85 The Application of 600 Volt Class ...
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<strong>Powell</strong> <strong>Technical</strong> <strong>Brief</strong> <strong>#85</strong><strong>The</strong> <strong>Application</strong> <strong>of</strong> <strong>600</strong> <strong>Volt</strong> <strong>Class</strong> Current Transformers inMedium <strong>Volt</strong>age Switchgearpage 2Table <strong>of</strong> BIL Tests on 6.5 Inch Bus Mounted Window Type Current TransformerInsulationMaterialNumber <strong>of</strong> BusBars per Phaseand Size (inches)Standard CurrentTransformerIncreased DielectricCurrent TransformerHipoxy-2000 ® (1) 1/2 x 3 Passed Passed(1) 1/4 x 4 Failed @ 82kV Passed(1) 3/4 x 4 Failed @ 78kV Passed(2) 1/2 x 3 Failed @ 94kV Passed(2) 1/2 x 4 Failed @ 74kV Passed(2) 3/4 x 4 Failed @ 72kV PassedGE-Noryl (1) 1/4 x 4 No Test Passed(2) 3/4 x 4 No Test Failed @ 94kVScotch BBI-4A(3) 3/4 x 4(sandwiched)No TestPassedNote: Standard current transformers would be suitable for all switchgear designs requiring 60kV.Jim Bowen<strong>Technical</strong> Director<strong>Powell</strong> Electrical Group<strong>Powell</strong> Electrical Systems, Inc.PO Box 12818 • Houston, TX • 77217©2005 <strong>Powell</strong> Industries, Inc. • All rights reserved.Tel: 713.944.6900 • Fax: 713.947.4453www.powellind.cominfo@powellind.com
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