SU1570009A2 - Receiving device for conference telecontrol through electric circuits - Google Patents

Abstract

The invention relates to devices for the protection and automation of power systems. The goal is to increase noise immunity. When transmitting command pulses over the network, they are received by the selector 2 and, together with the pulses from generator 1, are processed in the first and second elements 5 and 7 and start the pulse shaper 9. When an impulsive noise occurs in the network, a circuit from the third element 10, the first trigger 12, the second counter 13, the second trigger 14 is triggered, and the switch 17 is blocked through the element 16. 1 Il.

Description

ABOUT &

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The invention relates to telecommunications, can be used in the systems of protection and automation of power systems and is an improvement of the device according to the author. No. 1462497.

The aim of the invention is to improve noise immunity.

The drawing shows structures20

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on the electrical circuit of the receiving device, the pulse of the prohibition of 2 at duration on the units of the circular telecontrol system over the electric networks,: The device contains a generator 1 rectangular PULSE 9 selector 2 pulses, the first element NO 3, the set trigger 4, the first element I 5, the converter 6 pulses, the second element And 7, the first counter 8, the first driver 9 pulses, the third element And That, the element AND NOT 11, the first trigger 12, the second counter 13, the second trigger 14, the second driver. 15 pulses, the second element is NOT 16, the key 17 and the execution unit 18.

The device works as follows.

In standby mode, at the output of generator 1, pulses are generated with the mains frequency, the leading edge of which coincides with the moment of voltage transfer to the network through zero, the output of generator I is connected to the input of the first element HE 3, which inverts these pulses, and converter 6; At the output of the latter, pulses with a duration of approximately 0.1 m / s8 are produced, the leading edge of which coincides with the leading edge of the generator 1 pulses, and ensures that the driver 9 is set to zero, thus preparing the circuit for receiving commands from the body control,

When a command impulse generated by a transmitting device occurs in the network, they are accepted by selector, rom 2, the positive command impulses from the output of selector 2 are sent to the second inputs of the first and second elements 5 and 71, since the first input of the second element

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the time interval between the start pulse and the receive pulse.

Thus, the reception pulses arrive at the second input of the element AND NOT 11, at its first input - the coincidence pulses, which leads to the appearance at the output of the element AND-HE 11 negative pulses arriving at the counting input of the second counter 13,

When a pulsed interference occurs in the network in the zone of action of the inhibit pulse at the output of the third element And 10, a pulse arrives at the installation input of the first trigger 12, which is transferred to the connection 1, This potential arrives at the synchronization enable input of the second counter 13 and blocks it to the end of the current period of voltage, when the pulse from the output of converter 6, which enters the fault input of the first trigger 12, rotates into the state O, which removes the lock from the second synchronization enable input Counter 13, 35 The first output of the second counter 13 is the output of the first discharge and the second output is the output of the Nth discharge. If there is no interference in the N + n + 1 period of the network voltage after the N + n periods at the first output of the second the counter 1 will be O, which is fed to the input of the second element IIE 1 b, inverted by it, and from the output of the second element H 16 to the control input of the key 17 is fed 1, which allows the information to pass through the key 17,

The pulse from the second output of the second counter 13 is fed to the setup input of the second trigger 14, transferring it to state 1 to the end N + n of the supply voltage, when the pulse from the output of the first counter 8 arrives to the reset input of the second trigger 14, it returns to the O11 state. After one period of the mains voltage, after this pulse disappears, the second shaper 15 generates a pulse of 0.01 ms duration.

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And 7, the pulses come from the generator 1, at its output the starting pulses of the first shaper 9 appear in the positive half-periods of the network voltage. At the output of the first element And 5 there appear pulses of coincidence in the negative half-wave voltage of the network at a time t after the appearance of a pulse at the output of the second element And 7, since at the first input of the first element i

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And 5, an inverted rectangular pulse arrives. The start-up pulses arrive at the first input of the former driver 9. As a result, reception pulses of 24t duration are generated at its second output, at time t-4t. At the first output of the first generator 9, it appears

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about pulse ban lasting 2 at on

,

thirty

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the time interval between the trigger pulse and the reception pulse.

Thus, the reception pulses arrive at the second input of the element AND-NOT 11, at its first input - the coincidence pulses, which leads to the appearance at the output of the element AND-NO 11 negative pulses arriving at the counting input of the second counter 13,

When a pulsed interference occurs in the network in the zone of action of the inhibit pulse at the output of the third element And 10, a pulse arrives at the installation input of the first trigger 12, which is transferred to state 1, This potential enters the synchronization enable input of the second counter 13 and blocks it until the end of the current period of the mains voltage, when the pulse from the output of converter 6, which enters the reset input of the first trigger 12, returns to the state O, which removes the lock from the synchronization enable input ii second counter 13, 35 first output of the second counter 13 is an output of the first discharge and the second output - yield N-ro discharge. In the absence of interference in the N + n + 1 period of the network voltage after the N + n periods, the first output of the second counter 13 will be O, which will be input to the second element IIE 1b, inverted by it and from the output of the second element NOT 16 to the control input key 17 is supplied 1, which permits the passage of information through key 17,

The impulse from the second output of the second counter 13 is fed to the setup input of the second trigger 14, transferring it to state 1 until the end of the N + n periods of the network voltage, when it returns to the output of the second counter 8 coming to the reset input of the second trigger 14 O11 state. After one period of the mains voltage after this pulse disappears, the second driver 15 generates a pulse with a duration of 0.01 ms.

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The specified pulse from the output of the second shaper 15 is fed to the information input of the key 17, which leads to its opening and the inclusion of the Executive unit 18.

If there are pulsed g-interferences in the network, in amplitude and time interval between the pulse in the positive and negative half-voltage of the network coinciding with the remote control signal, but with a duration of more than N + n + 1 period of the network voltage, the receiving device processes them in a similar way . The difference is that at the first input of the second element is NOT 16 in the N + n + 1 period l, which will lead to O at its output and prohibit the passage of information through the key 17, as a result of false false

no executing unit 18 will occur.

Claims (1)

Invention Formula The receiving device of the systems 1 of the circular telecontrol over power grids by auth. No. 1462497, characterized in that, in order to improve noise immunity, a second element is introduced, the second counter is connected to the input of the execution unit through a second trigger, a pulse driver, and a key input through the second element entered sequentially connected It is NOT connected to the low-order output of the second counter, the reset input of which is combined with the reset output of the second trigger. 0