SU758388A1 - Device for monitoring emergency cutous of sectionalizing apparatus - Google Patents

Description

The invention relates to the field of electrical networks and is used to obtain information about the emergency shutdown of a sectioning device, 5 installed (in power lines, with its number.

A device is known to control the emergency shutdown of a sectioning apparatus, made on the basis of inertia contours, elements of the time-keeping function £ ΐ]. In this device, the recognition of the number of the sectioning apparatus (SA) occurs due to the concurrence in time of the signal from a certain inertial circuit and the appearance of a second (after a full cycle of automatic re-activation of the SA) current surge circuit (short circuit) in the power supply line. 20

The drawbacks of the device are low _; reliability and speed,

The closest technical

 the solution and the result achieved is a control device for emergency shutdowns of sectioning devices, containing signal relays and time delay elements [2].

A disadvantage of this device is that due to its use in dp

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The device of electromechanical time relays, capacitors, accumulating a charge, due to the error in the work requires the establishment of a significant difference in the time settings of the automatic reclosing device controlled by the SA. With a large number of SAs in a controlled line, this leads to a noticeable increase in the duration of the dead pause of the automatic reclosing devices of subsequent SA numbers, which impairs the power supply to consumers. Since for each controlled SA a device has its own capacitor, a time relay; the pointer relay, then when increasing / the number of Controlled SAs, the circuit of the device becomes much more complicated.

• The purpose of the invention is to increase functionality and increase reliability.

This goal is achieved by the fact that the device for monitoring emergency shutdowns of sectioning devices is equipped with pre-recision triggering decades, diode time arrays and logic elements, and the input time diode arrays are associated with time-delaying elements, and

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Outputs Diode arrays of time through logic elements are connected to signal relays.

The drawing shows a block diagram of the device.

The device consists of a short-circuit current sensor 1, a logic element 2 that implements the operation "memory" of an inversion element 3, a logic element 4 that implements operation AND, a logic element 5 "memory", a logic element 6 that implements operation AND, a logic element 7 "memory" that implements. operation OR, element 8 "inversion", logical element OR 9, element 10 "prohibition", input terminal 11, rectifying bridge 12, driver of 13 pulses, recalculating trigger decades 14-16, each of which divides into ten output pulses , pulses of the previous element, diode arrays 17-19 of time, logic elements 20-22, reversing the operation AND and triggered by the appearance at their inputs of signals corresponding to certain times, signal relays 23-25, element 26 "delay", block 27 reset.

The device works as follows. .

With a stable short circuit on the sectioned section, the first inrush of short circuit current appears in the line. In this case, the logic element 2 - “memory” triggers from the signal from the output of sensor 1 of the short-circuit current 1 and outputs a signal to one of the inputs of the logic element 4. Before the first inrush of the short-circuit current disappears, the signal at the output of element 3 is “inversion”, and therefore the second input of element 4 ye appears, the signal from the output of element 4 is missing,. and the element 5 "memory" will not work, the signal on the element 8 does not arrive.

"inversion", and therefore, from its output, a signal is taken at one of the inputs of the logical element OR 9, and element 10 - "prohibition" receives a prohibiting signal. The voltage removed from terminal 11 is not supplied to the circuit.

With the disappearance of the first throw, the short-circuit current signal at the input of element 3 is absent and a signal appears at its output, i.e. the second input of element 4 (its first input receives a signal from memory element 2), a signal appears at the output of element 4, element 5, the signal comes from its output to element 8 and to one of the inputs of the logic element b, the signal from the output of element 8 does not appear on one of the inputs of the logic element 9. From element 6, the signal does not arrive because it is on the second input there is no signal and element 7 does not work. The signal does not appear at the second input of element 9, but the next 10

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There is no prohibitive signal to the element 10. A voltage of 50 Hz from terminal 11 is applied to a rectifier bridge 12, from the output of which a pulsing voltage of positive polarity is applied to the shaper 13 pulses, which trigger pulses from the counting decade.

When the second short circuit current appears, a signal appears at the second input of element 6 (the signal appeared at the first input after the first short circuit current disappeared) and at its output, element 7 is triggered and a signal appears at one of the inputs of the element OR 9, the inhibiting signal from which rises element 10, and the voltage from terminal 11 in the circuit does not flow. The number of pulses received from the shaper of 13 pulses on recalculated decades 14-16 during the time between inrush of short circuit current is transferred during time using time matrices 17-19, from the outputs of which the corresponding time discharge is taken.

Logic elements 20-22, implementing the operation And / their inputs are connected to the outputs of the matrix 1719 time and one input to the element 7 of the memory. The activation of one or another element 20-22 occurs in the event that at its inputs signals of predetermined times appear, corresponding to the dead time of the automatic reclosing device of certain SAs, and a signal will appear from memory element 7. The signals from elements 20-22 trigger the corresponding signal relays 23-25, and the response of one of them gives information about the emergency shutdown of the corresponding CA, the dead time of the automatic recloser, which corresponds to the input time set of one of the triggered elements 20-22.

After a time greater than the time of the full cycle of the automatic recloser CA (from the moment of the appearance of the first surge of the short-circuit current), the signal from the element 26 - "delay" turns on the reset unit 27 and the device circuit returns to its original state.

The use of recalculated trigger decades in the device in conjunction with diode arrays of time, which make it possible to directly measure the duration of the device’s current pauses. Instead of electromechanical time relays and capacitors, SA does not require the installation of a significant difference in time settings, SA devices that provide power quality to consumers.

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Claims (1)

Claim The control device for emergency shutdowns of sectioning devices, containing signal relays and elements5 758388 ' 6 * You have a time delay, which is different in that, in order to expand functionality and increase reliability, it is equipped with recalculating trigger decades, diode time arrays and logic elements, and the input time diode arrays are associated with time restraint elements, and Ree logic elements connected to the alarm relay.