SU1691855A1 - Device for signaling of substation - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in substations of electric power systems. The aim of the invention is to simplify the reliability and accuracy of the counting of the number of short circuits to be switched off. The device contains a switching element 1 start, optocoupler element 2, element 3 delay, one-shot 4. trigger 5, switching element 6 installation, element 7, audio frequency generator 8, multivibrator 9, element 10, the driver 11 of the reference voltage, Schmitt trigger 12. 2 Il.

Description

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The invention relates to automation and computing technology and can be used in substations of electric power systems.

The purpose of the invention is to increase the reliability and accuracy of accounting for the number of disconnected short circuits.

FIG. 1 shows the device layout; in fig. 2 - diagram of operation of the oscillator frequency generator.

The device contains switching element 1 start, optocoupler element 2, element 3 delay, odkovibrator 4, trigger 5, switching element b of the installation, element VI 7, generator 8 audio frequency (GZCH), multivibrator 9, element And 10, driver 11 reference voltage and the Schmitg trigger 12.

The device works as follows

When closed contact element 1 at the output of the optocoupler element 2, there is a zero signal, which is fed to the inputs of the delay element 3, the one-shot 4, and the element 10. At the output of the one-shot

4 there is a single signal. At the inverting output of the trigger 5, there is a zero signal, which is fed to the input of the element 7. At the output of the element 7 there is a zero signal, therefore GZCH 8 does not work (slowed down) and there is no sound signal.

With non-inverting trigger output

5 unit signal is fed to the input element And 10, on the other input of which there is a zero signal from the output of the element 3 delay. At the output of the element And 10 there is a zero signal, causing the absence of light signaling Emergency shutdown. The device is in its original state.

From the output of the multivibrator 9, rectangular periodic signals with a duty ratio of -2 are fed to the input of the driver 11, which is a series-connected resistor and a zener diode, so that the output of the driver 11 is taken from the junction points of the resistor and the zener diode. Shaper 11 is adjusted so that the magnitude of the single signal at its output is 0.5 UpitM. Where

UnmM is the minimum allowable voltage at the battery terminals. Single signals from the driver 11 are fed to the input of a Schmitt trigger 12. When the battery voltage drops below the allowable output of the Schmitt trigger 12, a periodic rectangular signal appears, causing a flashing light to indicate the discharge of the battery.

When the contact of the element 1 is opened, a single signal appears at the output of the optocoupler element 2, which is fed to the input of the delay element 3. After setting

the time a single signal appears at the output of element 3. Element 3 is configured in such a way that it delays the single signal by a time equal to the maximum duration of the protection of the power supplying the substation. This eliminates spurious triggers of the alarm device during short circuits on lines adjacent to the line supplying the substation.

5 The single signal from the output of the delay element is fed to the input of the one-shot 4, the output of which at the same time appears short-term zero signal sufficient to record information in the trigger 5, On

0, an inverting output of the trigger 5 appears a single signal (the trigger switches), which is fed to the input element AND. 7, at the output of which rectangular signals appear at the same time, repeating signals arriving at the input of element And 7 from the multivibrator 9. At the appearance of each of the rectangular signals at the output of the GZCH 8, a burst of signals appears at the output of the GZCH 8 audio frequency (Fig. 2), Indicated

0 pulses are used to generate an intermittent audible signal Emergency Shutdown.

In this case, the zero signal from the non-inverting output of the trigger 5 is fed to the input

5 of the element And 10, at the output of which there is also a zero signal - light signaling

Pushing the switching element into

In the 0 setting, the trigger 5 returns to the initial state — a zero signal appears at the inverting output of the trigger 5, which arrives at the input of the AND element 7 and causes the presence of the zero signal at

5 output element and 7.

The generator 8 is also braked and there is no audible alarm. There is no emergency shutdown. At the non-inverting trigger output 5, a single appears

0 signal input to the element And

 10. If at the same time at the input of the element And 10

there is a single signal from element 3,

then at the output of the element And 10 appear

rectangular signals caused by

5 signals from the multivibrator 9 to the input element And 10. Flashing light signaling Emergency shutdown.

If by pressing on element 6 the contact of element 1 is closed again (emergency cleared), then when the sound alarm disappears. Emergency shutdown of the light signaling. Emergency shutdown does not occur, the device is in the initial state.

The device can be implemented on the cases of integrated circuits K564LA7 and transistors KT315.

Directly to the output GZCH 8 it is advisable to connect a telephone capsule type TK-67-U, which provides sound alarm, and on the outputs of the element 10 and Schmitt trigger it is advisable to connect light emitting diodes of the type AL310,

Claims (1)

Claims An alarm device for substations comprising a switching start element and a switching element of the installation, characterized in that, in order to improve the reliability and accuracy of the number of short-circuits to be switched off, an optocoupler element, a delay element, a one-shot, a trigger, two And elements are introduced into it, sound frequency generator, multivibrator, reference voltage driver and Schmitt trigger, and the device inputs are connected to the first input of the optocoupler element and the input of the switching start element, the output of which is connected to the second input of the optocoupler element, the output of which is connected to the input of the delay element, the output of which is connected to the input of the single vibrator and the first input of the first element I, the output of the single vibrator is connected to a single the trigger input, the zero input of which is connected to the output of the switching element of the installation, the single output of the trigger is connected to the second input of the first element And, the zero output of the trigger is connected en to the first the input of the second element And, the output of the multivibrator to the third input of the first element And, to the second input of the second element And to the input of the reference voltage generator, the output of the second element And is connected to the input of the audio frequency generator, the output of which and the output of the first element I are inputted respectively by the first and second outputs of the emergency shutdown signal of the device, the output of the reference generator the voltage is connected to the Schmitt trigger input, the output of which is the output of the battery discharge signal of the device. Vkod element I7 Other food element I7 Element output // 7