Outdoor Current Transformer 25 kV, 5 A to 1,200 A, 50/60 Hz, 150 kV BIL GE Grid Solutions Application. Insulation Class: 150 kV BIL, Outdoor Design Standard: IEEE C57.13 Reference Drawings & Accessories. Dimensions, Mounting & Wiring Diagram. Testing. Rated dynamic current (Idyn) Rated continuous thermal current (Icth) Rated insulation level Rated frequency Class of insulation Material (housing) IEC 61869-2:2012 60 x Ipr / 1s 2.5 x Ith 100% 0.72/3/-kV 50/60Hz E (120°C) PA 6.6, UL94: V2 Under no circumstances may the secondary Specifications per type EEM-CT-150-5 200-5 250-5 EEM-CT-300-5 400-5
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Example: Assume we need to use above 600:5 CT for a 150:5 application. First divide 150/5 which gives 30. From the figure above find out which combination gives total of 30 turns (answer X1-X3). Connect CT secondary leads between X1 and X3 and leave the other taps open. Now we have a 150:5 CT! Accuracy and Multi ratio CT. Please find some transformer wiring diagrams below: Transformer wiring diagram for single ratio current transformer. 100/5 A . Multi ratio current transformer, with an intermediate tapping on secondary winding. The output of the transformer decreases proportionally with the ratio. (150-200-300) /5A S 2 = 150/5A S 3 = 200/5A S 4 = 300/5A
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