| 摘要 |
FIELD: electricity. ^ SUBSTANCE: device includes control current source with frequency of 25 Hz, arc-suppression coil in-series connected to control current source and connected to neutral point of network and filters of zero-sequence currents installed in each network line. Responding elements are connected to filters of zero-sequence currents. At that, each responding element includes low-frequency filter, high-frequency filter, the inputs of which are connected to filter of zero-sequence currents, comparison element of amplitudes of harmonics, to the input of which low-frequency and high-frequency filter outputs are connected. ^ EFFECT: providing protection selectivity. ^ 2 dwg |
