| 摘要 |
A COMBINED TORIOD/SHUNT DEVICE FOR DETECTING RESIDUAL CURRENT IN AN ELECTRICAL INSTALLATION COMPRISING A PLURALITY OF CONDUCTORS SUCH AS A LIVE CONDUCTOR 2 AND A NEUTRAL CONDUCTOR 3 IS DESCRIBED. THE DEVICE COMPRISES A TORIOD MEANS 1, 4 FOR DETECTING AN AC RESIDUAL CURRENT WITHIN A FIRST RANGE AND A PLURALITY OF RESISTIVE SHUNTS 6a TO 6d FOR CONNECTION IN RESPECITVE ONES OF THE PLURALITY OF CONDUCTORS. A CURRENT DETECTION MEANS 5, 7, 13 RESPONSIVE TO CURRENT FLOWING IN EACH OF SAID SHUNTS FOR DETECTING A DC RESIDUAL CURRENT AND/OR AN AC RESIDUAL CURRENT WITHIN A SECOND RANGE IS DESCRIBED. THE FIRST RANGE OF AC RESIDUAL CURRENT IS AN AC RESIDUAL CURRENT RESULTING FROM EARTH LEAKGAE OR CROSS-LEAKAGE BETWEEN CONDUCTORS UP TO A SATURATION LEVEL AT WHICH THE TORIOD OR ELECTRONIC MEANS ASSOCIATED MEANS THEREWITH BECOMES SATURATED. THE SECOND RANGE INCLUDES AN AC RESIDUAL CURRENT OF SAID SATURATION LEVEL.
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