RELAY PROTECTION DEVICE FOR NETWORKS WITH LOW-POWER POWER SOURCES Russian patent published in 2023 - IPC H02H3/08 H02B13/00 

FIELD: electric power industry.

SUBSTANCE: invention relates to the systems for disconnecting short circuits in the intra-house power supply network. The known relay protection device for networks with low-power power sources, containing a sensitivity module, which includes a measuring-actuating element and a first closing element, is equipped with additional sensitivity modules, as well as modules for disconnecting excess load consumers and a power supply. The number of sensitivity modules and modules for disconnecting excess load consumers corresponds to the number of consumer load groups on which differential circuit breakers are installed. All sensitivity modules are made identically, their measuring and triggering element is installed in phase L of the critical load power circuit and its input is connected to the first output of the power supply. The output of the measuring-actuating element is connected to the first input of the first closing element, the second input of which is connected to phase L of the critical load power circuit, and the output is connected to the neutral working conductor N of the same circuit at the output of the critical load differential circuit breaker. All modules for disconnecting excess load consumers are designed identically and include a second closing element, the first input of which is connected to the second output of the power supply, the second input is connected to phase L of the excess load power circuit, and the output is connected to the neutral working conductor N of the same circuit at the output of the differential overload machine. The input of the power supply is configured to be connected to a switch installed in the electrical panel and configured to connect power wires from a general industrial network and power wires from a backup low-power source of electricity. The measuring and triggering element is a microprocessor configured to load and update the current setting value of a backup low-power source of electricity. In this case, the first and second closing bodies are identical magnetic releases. The sensitivity module, the module for disconnecting excess load consumers and the power supply are designed to be installed in an electrical panel.

EFFECT: expanding the scope of application, simplifying the design, installation and use of the relay protection device, ensuring selectivity and sensitivity of the 0.4 kV input electrical panel equipment when powered by low-power power sources.

3 cl, 2 dwg