FIELD: electrical engineering.
SUBSTANCE: invention relates to the field of electrical engineering. The device contains an adjustable grounding resistor (1) in the form of electrodes buried in the ground, connected to the neutral of the low-voltage network of the network substation, a neutral-forming device (2) connected to the first input of the switch package (3). The current winding of the arcing reactor (4) connected to the neutral of the neutralizing device (2) in parallel with the grounding resistor (1) is connected to the first input of the functional element of the all-mode network compensation adjustment meter (5), the second input of the capacitive current detection element (6) and the first input closing mode selection element (7). The outputs of the low-voltage windings of the voltage transformer (8) connected to the low-voltage busbars of the power transformer of the substation (9) are connected to the second input of the element of the all-mode network compensation adjustment meter (5) and to the second input of the circuit mode selection element (7). The first output of the element of the all-mode meter for setting the network compensation (5) and the outputs of the functional element for determining the capacitive current (6) and the element for selecting the closing mode (7) are connected to the corresponding inputs of the element for calculating the value of the protective resistor value (10), the output of which is connected to the second input of the package switches (3). A grounding resistor (1) is connected to the output of the switch package (3). The second output of the element of the all-mode meter for setting the network compensation (5) is connected to the input of the element for determining the capacitive current (6).
EFFECT: increasing the reliability of the device for protection against arc surges in networks with compensation of capacitive earth fault currents by eliminating the occurrence of overvoltages, adapting its operation mode in real time to changes in the network configuration.
1 cl, 1 dwg
