| 摘要 |
<p>PURPOSE: To obtain a split DC zero-phase current transformer having simple structure in which no error takes place even if a wire to be measured is clamped/unclamped repeatedly. CONSTITUTION: A pair of split annular cores 11 are provided, at the intermediate parts thereof, with gaps 15, 16 for arranging Hall elements and magnetically shielded by outer, inner and side shields 12, 13, 14 with a gap being formed between the core and the shield. Two Hall elements 17 are connected in parallel and a variable resistor VR for regulating the leakage flux including the shield and the gap is connected with the output of one or both Hall elements. This structure realizes a split DC zero-phase current transformer in which error and residual current are reduced even if a wire to be measured is clamped/ unclamped repeatedly.</p> |
