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"So the CT isn't broken," Sarah realized, "it just isn't performing to its standard rating."
Requirements for standard current transformers.
Sarah watched the readout on her tablet. "I see it. The secondary winding resistance is slightly higher than the datasheet says. Wait, the accuracy limit factor..."
Mei's CT passes at 15 VA. But at 4 VA (25% of rated), a resonance with the cable capacitance causes a 2-degree phase shift. Fail. The design is rejected. The team discovers that their secondary winding has too many turns, creating parasitic capacitance. They respool the winding with a different insulation—a change driven not by electrical theory, but by the soul of 61869-2: accuracy must be robust, not fragile .
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Alcare Pharmaceuticals Pte Ltd
12A Jalan Ampas #03-03
Singapore 329516
Call: 6250 8689
Whatsapp: 8218 4157
Fax: 6255 5872
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