Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection (specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems H02H7/00; systems for change-over to standby supply H02J9/00 )

18 direct subcodes

Child Classifications

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H02H 3/003
H02H 3/006
H02H 3/02 Details
H02H 3/08 responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04)
H02H 3/12 responsive to underload or no-load
H02H 3/14 responsive to occurrence of voltage on parts normally at earth potential
H02H 3/16 responsive to fault current to earth, frame or mass (with balanced or differential arrangement H02H3/26 )
H02H 3/18 responsive to reversal of direct current
H02H 3/20 responsive to excess voltage
H02H 3/24 responsive to undervoltage or no-voltage
H02H 3/26 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
H02H 3/38 responsive to both voltage and current; responsive to phase angle between voltage and current
H02H 3/40 responsive to ratio of voltage and current
H02H 3/42 responsive to product of voltage and current
H02H 3/44 responsive to the rate of change of electrical quantities
H02H 3/46 responsive to frequency deviations
H02H 3/48 responsive to loss of synchronism
H02H 3/50 responsive to the appearance of abnormal wave forms, e.g. AC in DC installations