Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection

Classification Context

Section:

ELECTRICITY

Class:

GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

Subclass:

EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS

Related Keywords

Child Classifications

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• H02H 3/02 Details
• H02H 3/08 responsive to excess current
• 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
• H02H 3/18 responsive to reversal of direct current
• H02H 3/2 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 3/4 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 3/5 responsive to the appearance of abnormal wave forms, e.g. AC in DC installations