FIELD: insulated-neutral alternating-current low-voltage power distribution networks and two-wire direct-current networks.
SUBSTANCE: proposed method includes current (voltage) and insulation resistance measurements, comparison of measured values with relay settings tuned away from normal transient conditions of equipment under protection, and operation of final element in case measured values exceed setting ones; relay operating current (voltage) settings are tuned away from continuous admissible conditions provided ground-fault or current (voltage) relays operate simultaneously or sequentially one after another but within selective time delay of protective gear. Two design alternated of device implementing this method are also proposed.
EFFECT: enhanced response to arcing short circuits.
4 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| SELECTIVE PROTECTION DEVICE AGAINST SINGLE-PHASE EARTH FAULT OF ELECTRIC NETWORKS OF MIDDLE VOLTAGE CLASS | 2021 |
|
RU2769099C1 |
| DEVICE FOR CURRENT PROTECTION AGAINST SHORT CIRCUIT AND OVERLOAD | 0 |
|
SU1157607A1 |
| DEVICE OF RELAY PROTECTION FOR LOCAL BACKUP OF AUTO-TYPE TRANSFORMER PROTECTIONS | 2017 |
|
RU2639314C1 |
| DEVICE FOR PROTECTING AGAINST EARTH LEAKAGE IN ISOLATED NEUTRAL SYSTEM | 0 |
|
SU1138874A1 |
| METHOD OF PROTECTION AGAINST SINGLE PHASE-TO-EARTH FAULTS IN MEDIUM VOLTAGE ELECTRICAL NETWORKS | 2017 |
|
RU2672663C1 |
| ELECTRICAL REVERSIBLE CONVERTER PROTECTION DEVICE | 2018 |
|
RU2702105C1 |
| METHOD AND DEVICE FOR GROUND FAULT PROTECTION OF GENERATOR STATOR WINDING | 1995 |
|
RU2096885C1 |
| DEVICE FOR PROTECTION OF FACTORY-ASSEMBLE SWITCH-GEARS | 1992 |
|
RU2025859C1 |
| DISTRIBUTING BOARD PROTECTING DEVICE | 0 |
|
SU746808A1 |
| APPARATUS FOR GROUNDING PROTECTION OF STATOR OF GENERATOR COUPLED WITH TRANSFORMER | 0 |
|
SU1339732A2 |
