|  | H |
SECTION H — ELECTRICITY

|  | H02 |
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

|  | H02H |
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions Fulltext... Hierarchy... Expanded...G01R, e.g. Fulltext... Hierarchy... Expanded...G01R 31/00, Fulltext... Hierarchy... Expanded...G08B; locating faults along lines Fulltext... Hierarchy... Expanded...G01R 31/08; emergency protective devices Fulltext... Hierarchy... Expanded...H01H)

|  | H02H |
Note(s) This sub-class deals only with circuit arrangements for the automatic protection of electric lines or electric machines or apparatus in the event of an undesired change from normal working conditions.

|  | H02H 1/00 |
Details of emergency protective circuit arrangements

|  | H02H 1/02 |
· | Arrangements for suppressing earth-fault currents, e.g. Petersen coil

|  | H02H 1/04 |
· | Arrangements for preventing response to transient abnormal conditions, e.g. to lightning

|  | H02H 3/00 |
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 Fulltext... Hierarchy... Expanded...H02H 7/00; systems for change-over to standby supply Fulltext... Hierarchy... Expanded...H02J 9/00)

|  | H02H 3/02 |
· | Details

|  | H02H 3/04 |
· · | with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned

|  | H02H 3/06 |
· · | with automatic reconnection

|  | H02H 3/08 |
· | responsive to excess current (responsive to abnormal temperature caused by excess current Fulltext... Hierarchy... Expanded...H02H 5/04)

|  | H02H 3/10 |
· · | additionally responsive to some other abnormal electrical conditions

|  | 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 Fulltext... Hierarchy... Expanded...H02H 3/28)

|  | H02H 3/18 |
· | responsive to reversal of direct current

|  | H02H 3/20 |
· | responsive to excess voltage

|  | H02H 3/22 |
· · | of short duration, e.g. lightning

|  | 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 3/28 |
· · | 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

|  | H02H 3/30 |
· · · | using pilot wires or other signalling channel

|  | 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

|  | H02H 3/34 |
· · · | of a three-phase system

|  | H02H 3/36 |
· · | involving comparison of the voltage or current values at corresponding points of different systems, e.g. of parallel feeder systems

|  | 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 5/00 |
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection (specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems Fulltext... Hierarchy... Expanded...H02H 7/00)

|  | H02H 5/04 |
· | responsive to abnormal temperature

|  | H02H 5/06 |
· · | in oil-filled electric apparatus

|  | H02H 5/08 |
· | responsive to abnormal fluid pressure, liquid level or liquid displacement

|  | H02H 5/10 |
· | responsive to mechanical injury, e.g. rupture of line, breakage of earth connection

|  | H02H 5/12 |
· | responsive to undesired approach to, or touching of, live parts by living beings

|  | H02H 7/00 |
Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions (structural association of protective devices with specific machines or apparatus, see the relevant sub-class for the machine or apparatus)

|  | H02H 7/04 |
· | for transformers

|  | H02H 7/06 |
· | for dynamo-electric generators; for synchronous capacitors

|  | H02H 7/08 |
· | for dynamo-electric motors

|  | H02H 7/085 |
· · | against excessive load

|  | H02H 7/09 |
· · | against over-voltage; against reduction of voltage; against phase interruption

|  | H02H 7/093 |
· · | against increase beyond, or decrease below, a predetermined level of rotational speed (centrifugal switches Fulltext... Hierarchy... Expanded...H01H 35/10)

|  | H02H 7/097 |
· · | against wrong direction of rotation

|  | H02H 7/10 |
· | for converters; for rectifiers

|  | H02H 7/12 |
· · | for static converters or rectifiers

|  | H02H 7/14 |
· · · | having auxiliary control electrode

|  | H02H 7/16 |
· | for capacitors (for synchronous capacitors Fulltext... Hierarchy... Expanded...H02H 7/06)

|  | H02H 7/18 |
· | for batteries; for accumulators

|  | H02H 7/20 |
· | for electronic equipment, e.g. for amplifier, for radio transmitter

|  | H02H 7/22 |
· | for distribution gear, e.g. bus-bar systems; for switching devices

|  | H02H 7/24 |
· | for spark-gap arresters

|  | H02H 7/26 |
· | Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred

|  | H02H 7/28 |
· · | for meshed systems

|  | H02H 9/00 |
Emergency protective circuit arrangements for limiting excess current or voltage without disconnection

|  | H02H 9/02 |
· | responsive te excess current

|  | H02H 9/04 |
· | responsive to excess voltage

|  | H02H 9/06 |
· · | using spark-gap arresters

|  | H02H 11/00 |
Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result