RU9108U1 - DEVICE FOR TRANSMITTING AND RECEIVING AUTOMATIC TEAMS - Google Patents

Abstract

A device for transmitting and receiving automation commands, comprising a multi-frequency generator with a control unit, transmitting and receiving interface units with a communication channel, single-frequency signal receivers connected to the outputs of the receiving interface unit and equipped with enabling inputs, a control signal receiver, the output of which is connected to the control circuit resolving input of the receiver of the first single-frequency signal, characterized in that the first delay element is introduced into the control circuit, and the output of the receiver of the first single-frequency signal second signal through a second delay element connected to the enable input of second single frequency signal receivers.

Description

DEVICE FOR TRANSMITTING AND RECEIVING AUTOMATIC TEAMS

Technical field1

The utility model relates to electrical engineering and can be used, for example, in emergency control systems of power systems for transmitting commands to high-frequency (HF) channels of power lines.

State of the art

Known devices for transmitting and receiving emergency control commands on the RF channels of power lines 1.

Devices 1 use a dedicated RF channel for operation, which occupies the full frequency band of a standard communication channel 4 kHz wide. This causes difficulties in the design of high-frequency channels in power systems, since the frequency spectrum presented for high-frequency communications over power lines is extremely compacted by channels for various purposes.

Closest to this utility model is selected as a prototype device for transmitting and receiving automation commands 2, containing a multi-frequency generator with a control unit, transmitting and receiving units for interfacing with a communication channel, single-frequency signal receivers connected to the outputs of the receiving interface unit and equipped with permissive inputs, and a control signal receiver, the output of which through the control circuit is connected to the permissive inputs of the receivers of a single-frequency power. This device uses a single-frequency code for transmitting commands, in which the transmission of each command. Corresponds to sending one pulse signal with a frequency corresponding to this command.

The disadvantage of prototype 2 is the low noise immunity with respect to selective interference, which makes it impossible to transmit emergency signals from the emergency equipment via the cable used for telephone communications.

MPK N04VZ / 54

The objective of the utility model is to increase the noise immunity of the device and, thereby, ensure the robustness of reliable transmission of automation commands over telephone channels.

Utility Model Disclosure

The subject of the utility model is a device for transmitting and receiving coma-ed automation, containing a multi-frequency generator with a control unit, transmitting and receiving units for interfacing with a communication channel, single-frequency signal receivers connected to the outputs of the receiving interface unit and equipped with enabling inputs, a control glass receiver, the output of which is via the control circuit is connected to the enable input of the receiver of the first single-frequency signal, characterized, according to the utility model, in that rvy delay element, and the receiver output of the first single-frequency signal through a second delay element connected to the enable input of second single frequency signal receivers.

The indicated set of features makes it possible to increase the noise immunity of the device to selective interference.

Brief Description of the Drawings

Figure 1 presents an example implementation of a device for transmitting and receiving two automation commands, figure 2 shows the temporary diaphragm of its operation.

Description of Utility Model Implementation

The device of Fig. 1 comprises a multi-frequency generator 1 with a control unit 2, a transmitting unit 3 and a receiving unit 4 for interfacing with a communication channel, a receiver 5 of the first frequency signal, receivers 6 and 7 of the second single-frequency signals and a control signal receiver 8. The receivers 5, b, 7 and 8 are connected to the outputs of the interface unit 4. The receivers 5, b and 7 are equipped with enabling inputs 9, 10 and 11, respectively. The output of the receiver 8 of the control signal through the control circuit with the first delay element 12 is connected to the enable input 9 of the receiver 5 of the first single-frequency signal. The output of the receiver 5 of the first odofrequency signal through the second delay element 13 is connected to the resolving inputs 10 and 11 of the receivers 6 and 7 of the second o / single-frequency signals.

The device operates as follows. In the standby mode (in the absence of automation commands), the generator 1 generates a signal called a control signal whose frequency fk lies outside the frequency spectrum of telephone signals. This glass passes through the pairing unit 3 and is transmitted via a communication channel in parallel with telephone signals.

On the receiving side, the sijals from the outputs of the interface unit 4 to the communication channel are fed to the inputs of the receivers 5.6.7 and 8.

The presence in the communication channel of the control signal fixes the receiver 8, tuned to the corresponding frequency, and through the control circuit with the element 12 acts on the enable input 9 of the receiver 5, prohibiting the start of the element 13. However, the element 13 does not provide an enable signal to the inputs 10 and 11 of the receivers 6 and 7. Receivers 6 and 7 do not work at this time, even if a pulse with the frequency of the second single-frequency signal arrives at the input of any of them. This prevents false reception of commands simulated by telephone signals.

When a command is placed on the transmitting side of an input to block 2, it changes the frequency of generator 1 in such a way that the output of the control signal stops and two consecutive pulses occur: first with the frequency of the first single-frequency sipnal fo, and then with the frequency fh the second single-frequency signal (figure 2, line 1) corresponding to the transmitted command. At the same time, block 2 prohibits the transfer of telephone signals for the duration of the transfer of automation commands by appropriate control of the communication channel equipment.

The frequencies fo and fn can be located in the spectrum of tepephone signals. In the case of the simultaneous receipt of several commands, their transmission is carried out in the order of the established priority.

In the receiving part, the termination of the control signal reception causes the action of the element 12 on the enable input 9 of the receiver 5 of the first single-frequency sijap during the time b (Fig. 2, line 2). If the first single-frequency frequency signal fo occurs in this time interval, then receiver 5 captures its arrival. The termination of the reception of the first single-frequency signal causes the triggering element 13 delay, which during the time interval to (figure 2, line 3) allows the operation of the receivers 6 and 7 of the second single-frequency signals. If at this time a glass comes with a frequency fh, to which one of the receivers 6 or 7 is tuned, then the corresponding receiver issues a received automation command (Fig. 2, line 4). For the rest of the time, issuing commands is excluded.

Due to the fact that in the proposed device the issuance of an automation command is caused by the alternate transmission and appropriate reception of three signals of different frequencies, it provides for the false reception of commands that can be caused by telephone signals when transmitting automation commands via a telephone communication channel.

Industrial applicability

The proposed usability is applicable, for example, for transmitting emergency control commands for power systems via the RF channels of power lines. In this case, this utility model can be implemented directly by finalizing the prototype 2, which contains the main blocks of the proposed device.

Sources of information

1. G.V., Skitaltsev B.C. High frequency power line communications. M. Energoatomizdat, 1987.

2. Wanderers B.C. The equipment of communication channels for the transfer of sitals of automation ANKA-AVPA. Electrical stations, 1984. No. 2, p. 63 - 67.

Claims (1)

A device for transmitting and receiving automation commands, comprising a multi-frequency generator with a control unit, transmitting and receiving interface units with a communication channel, single-frequency signal receivers connected to the outputs of the receiving interface unit and equipped with enabling inputs, a control signal receiver, the output of which through the control circuit is connected to resolving input of the receiver of the first single-frequency signal, characterized in that the first delay element is introduced into the control circuit, and the output of the receiver of the first single-frequency signal second signal through a second delay element connected to the enable input of second single frequency signal receivers.