| 摘要 |
Provided is an apparatus an method for identifying a specific lost current transformer (CT) signal of number of CT signals provided by a corresponding number of CTs (54, 56, 58) coupling to a protective device (100) to at least one protection zone (16). The method includes selectively providing pairs of first and second binary control signals corresponding to each of the CT signals in response to comparasons of RMS current changes of respective CT signals. A third binary control signal associated with a protection zone is provided in response to receipt of the pairs of first and second binary control signals. A first value for only one of the first binary control signals, a second value for all of the second binary control signals and the first value for the third binary control signal for a predetermined time indicates the loss of the CT signal corresponding to the first binary control signal having the first value.
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