RU1815731C - Method for detection of faulted phase wire for protection of aerial transmission line from short circuit - Google Patents

Abstract

The essence of the invention lies in the fact that, depending on the magnitude of the current of the emergency components, the selection of the damaged phase is made either by the current channel or when the current value of a certain value is exceeded by the voltage channel, thereby increasing the selectivity of the selection of the damaged phase for all types of short circuits. 1 ill.

Description

The invention relates to the field of electrical engineering, in particular to devices for the relay protection of overhead power lines used, in particular, in conjunction with a single-phase automatic reclosing device.

The aim of the invention is to increase the selectivity for all types of short circuits.

The drawing shows a structural diagram of the device. The device for selecting a damaged phase contains converters 1, 2, 3 phase currents minus the zero sequence current, converters 4, 5, 6 phase voltages minus the zero sequence voltage, the outputs of both types of converters are connected to the inputs of blocks 7 - 12 of the allocation of emergency components which are connected by their outputs to the inputs of the blocks 13 - 18 of the allocation of emergency components modules, the outputs of which are in current circuits

connected to the inputs of the keys 19, 20, 21 and max selector 22, and in the voltage circuits to the inputs of the keys 23. 24, 25. the output of the max selector 22 is connected to the second input of the comparator 26 of the maximum current, and the output is fed to its first input adjustable constant voltage source, the output of the specified comparator is connected directly to the combined control inputs of the keys 19, 20, 21 and through the logic element 27 NOT to the combined control inputs of the keys 23. 24, 25, the outputs of the keys in current and voltage circuits wives are phased integrated and connected to the first input odes of comparators 28, 29, 30 and inputs of the max selector 31, the output of which through the divider 32 is connected to the first input of the comparator 33, the second input of which is supplied with an adjustable reference voltage, and the output is connected to the combined second inputs of the comparators 28, 29, 30, the outputs of which are are outputs of the device as a whole.

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Claims (1)

SUMMARY OF THE INVENTION A device for selecting a damaged phase to protect an overhead power line from short circuits, containing phase current to voltage converters in each of the three phases, the first inputs of which are designed to be connected to the corresponding current circuits, emergency component isolation units, the outputs of which are connected to the inputs of the blocks for the formation of emergency component modules, three two-input comparators, the outputs of which are the outputs of the device as a whole, characterized in that, in order to increase villages For the selection of faulty phases, three two-input voltage to voltage converters, three emergency component extraction units, three emergency component module forming units, six keys, two max selectors, fourth and fifth comparators, voltage divider, an element were additionally introduced NOT, moreover, the three inputs of the first max selector are connected in phase to the outputs of the blocks for forming the modules of emergency components of currents, and the output is connected to the input of the fourth comparator, the output is connected to the control inputs of the first x three keys, the main inputs of which are connected to the outputs of the unit for generating modules of emergency component currents, the output of the fourth compiler is also connected to the input of the element NOT, the output of which is connected to the control inputs of the second three keys, the main inputs of which are connected to the outputs of the units for generating modules of emergency voltage components, the inputs of which are connected to the outputs of the units for extracting emergency voltage components, the inputs of which are connected to the corresponding outputs of the voltage-to-voltage conversion blocks, the first inputs of which are intended to be connected to the corresponding phase voltage circuits, and the second inputs of which are designed to connect to the zero-voltage voltage circuits, the outputs of the keys in the voltage current circuits in phase combined and connected to the first inputs of the first, second and third comparators and the inputs of the second max selector, the output of which through a voltage divider is connected to the input of the fifth comparator, and the output is connected to the combined second inputs of the first / second and third comparators, the inputs of the blocks for the allocation of emergency components in the current circuits are connected to the output of the current converters to voltage, the second input which is intended for connection to zero-sequence current circuits.