SU1707551A1 - Device for control of distributing device grounding knife position for distributing devices included in outgoing air lines - Google Patents

Abstract

The invention relates to electrical measuring technique. The purpose of the invention is to simplify the device by reducing the number of capacitive selection sensors and high voltage control units used, as well as eliminating the electrical connection of the latter with the buses of the switchgear. The device contains for each phase the high voltage control unit 1 controllable key 2, threshold organ 3, display unit 4 and sensor 5. of capacitive selection, by means of which the device is connected to the corresponding phase of the outgoing three The presence of the additional elements (threshold unit 3, control key 2, the indication unit 4 and the corresponding functional connections) allows, after the disconnection of the outgoing power line 6 of the switching device, the power supply line 6 of the transmission line at the point of connection of the Earthing blade 1 to it. . The catfish 8 provides control of the voltage level and the position of the grounding knife 7 of its corresponding phase, 1 sludge. with 1O (L G4

Description

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The invention relates to electrical measuring equipment and is intended for use in power supply systems of cities and agricultural areas.

The purpose of the invention is to simplify the device by reducing the number of sensors used for capacitive selection and control units for the presence of voltage, as well as Eliminating the connection of the latter with the tires of the device, to which the switching device of the outgoing power line is connected. 15

The drawing shows a block diagram of the device (for each Phase).

The device contains a high voltage control unit 1, - a control key 2, to the output of which 20 a threshold organ 3 is connected, an indication module C connected to the output of the threshold organ 3, and a capacitive selection sensor 5. The control input of the key 2 is connected to the output of the control unit 1 5 of the presence of high voltage, and the input of the controllable key 2 and the input of the control unit I of the presence of high voltage through the capacitive selection sensor 5 are connected to one of the three-phases of the moving three-phase the power line 6 at the place where the grounding knife 7 is connected to it, the print indicated three-phase waste. The stuffy transmission line 6 is connected to a power source (not shown) through the switching device 8, for example, a series-connected switch and disconnector,. The capacitive selection sensor 5 can be made, for example, in the form of a standard reference insulator, which uses the existing natural capacity between the two flanges. The unit 1 controls the presence of high voltage, 45 as well as the threshold organ 3 can be made in the form of minimum voltage relays, such as semiconductor ones. For the other two phases of the outgoing three-phase overhead transmission line 6, the device is similar to that described.

The device works as follows.

When the position of the switching device is on, a nominal voltage is present on the outgoing three-phase overhead transmission line 6. This voltage is applied.

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through the sensor 5 of capacitive selection to the input of the unit 1, the control of the presence of high voltage, which is triggered and | gives information to operating personnel about the presence of high voltage on the specified line 6 (for example, through the telemechanics channels to the dispatcher of electrical networks). In this case, the key 2 is open, since its control input has a signal coming from the output of the high voltage control unit 1, and the display unit b does not work. When the switching device 8 is disconnected on line 6, the nominal voltage is missing and the High voltage presence control unit 1 returns to its original state, since its response and return thresholds are selected taking into account the nominal voltage of line 6, and the switch 2 closes, as its control input disappears the signal of the bdok 1 monitoring the presence of high voltage. After switching off the switching device 8, the voltage on the outgoing three-phase overhead transmission line 6 relative to the ground does not become zero due to the voltage being induced by the electromagnetic field of the adjacent power lines, and other external sources of the electromagnetic field, for example electrified railways, lines that leads to the triggering of the threshold organ 3 and the display unit, which indicates by its actuation that the grounding knife 7, which performs the functions of protective grounding, turned off. When the earthing knife 7 is turned on, the induced voltage on the outgoing three-phase overhead line 6 decreases abruptly and the threshold organ 3 and the display unit A returns to the initial failure state. In this case, the return of the display unit A signals an additional increase in reliability. determining the inclusion of the grounding knife 7, the device can be additionally equipped with a logic element AND, the inputs of which receive signals from the output of the voltage control unit 1 and from the output of the unit indication, and the executive body. enabled at the output of the logical element I, which signals to the dispatcher of electrical networks about switching on170755

grounding knife 7 and. blocks the switching device switching on 8..

Claims (1)

Thus, the proposed device provides the determination of the position of the grounding knives on the outgoing three-phase overhead transmission line, and at the same time it possesses a significantly larger additional sensor than the prototype used in the prototype. bone sampling and voltage control units, as well as the electrical connection of the latter with the busbars of the device to which the switching device of the outgoing line is connected. Invention Formula Device for controlling the position of the grounding knives 20 j. - five 0 devices connected to waste air lines, containing three capacitive selection sensors connected to three phases of a three-phase outgoing power line, and three high voltage control units, characterized in that, in order to simplify, it additionally three controllable keys, threshold organs and display units are introduced ,; moreover, the inputs of the controllable key and the control unit for the presence of high voltage, the output of which is connected to the control input of the controllable key, are connected to the output of each capacitive selection sensor, and a threshold element is connected to the output of each controllable key and is connected to the corresponding display unit .