responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection > responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents

CPC:

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 ) > responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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H02H 3/265 CPC only CPC only
H02H 3/28 involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus +2 CPC IPC+CPC Available in IPC and CPC
H02H 3/32 involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors +1 CPC IPC+CPC Available in IPC and CPC
H02H 3/36 involving comparison of the voltage or current values at corresponding points of different systems, e.g. of parallel feeder systems +1 CPC IPC+CPC Available in IPC and CPC