| 摘要 |
A current imbalance sensor comprising a toroidal core and output winding assembly (11) and a first electrical conductor (16) in the form of a tubular element of non-magnetic material extending co-axially through the toroidal assembly (11). The conductor (16) is arranged at its ends to be connected in one of two electrical lines to be monitored, the lead constituting the other of the two lines to be monitored extending, in use, coaxially through the tubular element (16).
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