FIELD: electric power and electrical engineering.
SUBSTANCE: invention can be used to determine a damaged outgoing line with a ground fault and the distance from the substation to the fault in distribution networks of 6-35 kV. The location of the fault and the distance from the substation to it are determined by measuring the currents with the voltage resonance frequency on the protected lines. The device for selective determination of the damaged connection and the distance from the substation to the place of occurrence of a single-phase earth fault contains a control system and high-frequency sensors installed on each phase of power lines extending from the bus section of the substation. The control system includes a nodal control unit, a high-frequency generator launched from the nodal control unit and connected to a high-frequency inductor through a power amplifier to supply a signal to the bus sections of the substation, a radio module for wireless information exchange of the nodal control unit with high-frequency sensors, and a power supply unit. The high frequency generator is configured to generate signals with a frequency varying in the range of 1-10 kHz to determine the damaged outgoing line, and in the range of 10-100 kHz to scan the damaged outgoing line and determine the distance from the substation to the fault. The high-frequency sensor contains a high-frequency transformer, a controllable scale amplifier, a high-frequency filter, a high-frequency AC-to-DC converter, and an analog-to-digital converter connected to a processing and control unit that controls the processes of measuring a high-frequency signal, receiving and transmitting information about a damaged outgoing line and distance to the place of a single-phase earth fault via a radio channel through a radio module to the node control unit of the device control system, and a power supply unit.
EFFECT: remote detection of an outgoing line with a single-phase ground fault and the distance to the fault point in various types of transmission lines.
1 cl, 1 dwg
