SU881810A1 - Device for transmitting and receiving television signals - Google Patents

Description

one

The invention relates to a technique for remote monitoring and measurement of parameters of linear objects of pipelines, for example, for monitoring cathodic protection and process parameters of gas in gas pipelines.

Telecontrol devices are known in which for the transmission of information various communication channels are used, for example, a pipe channel, a high-frequency and a pulse channel through high-voltage lines, channels through cable radio-relay lines.

However, the implementation of these devices involves the construction of special expensive communication lines and the use of high-frequency equipment for the compression of power circuits of high-voltage lines. At the same time, the use of the pipeline channel is limited by the conductivity of the insulation coating of the underground pipeline.

The closest in technical essence to the proposed is a device for transmitting and receiving television signals, containing on the transmitting side a cathodic protection unit, the first output of which is connected through the primary winding of the transformer to the high-voltage line, through a capacitor connected to the pipeline, the terminals of the secondary winding of the transformer are connected to one the inputs of the block of remote switches, the other input of which is connected to the pipeline and to the corresponding inputs of the cathodic protection unit and the remote control unit eklyuchateley, at the receiving side a first terminal of transformer primary winding is connected to a high voltage line, a second terminal of the primary winding of the transformer is connected via a first capacitor to the line to the first vshodam indicators and to the first terminal of the coil formers rele-, wherein the second terminal through the contacts

the switch and the button contact is connected to the second output of the transformer primary winding, the first output of the switch-transformer coil is connected via the second capacitor to the second input of the switch, the second outputs of which are connected to the second outputs of the respective indicators and the first contact of the switch of the transformer to the contact of the G21 button.

A disadvantage of the known device is the low information transfer rate.

The aim of the invention is to increase the speed of information transfer.

The goal is achieved by the fact that remote switches, transistors, zener diodes, a diode and resistors, transistors emitters are connected to the positive terminal of the power source, transistor collectors through the corresponding contacts of the remote switches; they are connected to the first terminals of the remote switches, the second the terminals of which are connected to the negative terminal of the power supply, the bases of the transistors are connected via the corresponding individual zener diodes Without a common Zener diode to the emitters of the transistors and through a series-connected resistor and diode to the input of the cathodic protection unit, a chain of series-connected capacitors and a switch contact is connected in parallel to the secondary winding leads, a source of different voltage ratings, a capacitor and switch contacts, the first input of the source of various voltage ratings is connected to the pipeline, the second input is combined with the second outputs of the switch, the output outputs of the various The voltage inputs are connected through series-connected contacts of the switch and the second contact of the relay-forcing device with the opening contact of a button, parallel to the terminals of the secondary winding of the transformer, a chain of serially connected capacitors and the third contact of the relay-forming device are connected.

FIG. I is a diagram of a transmitting semi-bundle; Fig 2 is a diagram of the receiving half.

The transmitting semi-kit contains a transformer 1, a capacitor 2, a pipeline 3, a high-voltage line 4, remote switches 5 and 6,: contacts 7 of remote switches, transistors 8 and 9, individual zener diodes .10 and 11, resistor 12, diodes 13 and 14, resistors 15, common Zener diode 16, relay 17, diodes 18, block 19 remote switches, capacitors 20, rectifier

21, capacitor 22, switches 23 and 24 switches, cathodic protection stations 25, anode earthing switches 26, resistor 27, switch contacts 28, cathodic protection unit. 29, diode

5 30, contact 31 relay-formers and capacitors 32.

The receiving half set contains a source of different nominal voltages 33, switch 34, relay-for0 globalizer 35, contact 36 of the relay forcing, capacitor 37, contacts 38 and 39 of the switch, indicator 40, stabilizer 41,., LED 42, contacts 43 of the relay forming, the contacts of the button 44, the capacitor 45, the contacts 46 and 47 of the relay-forming device, the high-voltage line 48, the transformer 49, the capacitor 50, pipeline 51,

The device works as follows.

Commands for calling the corresponding controlled point are generated by the command driver in the form of DC pulses of a given duration and amplitude. The pulse amplitude for each controlled point has its own specific value, which is selected using switch 34. The outputs of the power source 33 are connected to the contacts of the switch 34 in order of decreasing voltage. When the contact group 38 of the switch closes, the capacitor 37 is discharged to the winding of the relay driver 35, which through its contact 47 switches 34 and button 44 connects the corresponding output of source 33 to the primary winding of transformer 1 and leads to the conduit channel.

0 polarity with respect to the pipeline

5 In the transmitting half-set (Fig. 1), the pulses through Zener diodes 10, 11, having different stabilization voltages, arrive at the bases of transistors 8 and 9. If the amplitude of the pulse is such that only Zener-11 is probing, the transistor 8 is opened and the working the winding of the first remote switch 5. At the same time, contacts 7 and 28 are switched. Switching contacts causes the discharge of one of the capacitors 20 to the winding of relay 17, which by its contact 24 o & ensures the formation of a synchronous pulse by the communication channel relative to the pipeline polarity, which in the receiving half (figure 2 is fixed by the LED 42. After the discharge of the capacitor 20 is completed, the relay driver returns to its original state and, by its contact 31, connects the first cathode station 25 to the communication channel. Cathode voltage stations is normalized to a value not exceeding the voltage of stabilization of the Zener diodes 10, 11 and 16. With the help of a group of contacts 39 of the switch (Fig. 27 a connection is made to the communication channel of the corresponding measuring The lamp 40. The switches have three positions: top unstable, which serves for generating commands mean steady serving for receiving the clock pulse, acknowledging the reception and execution of commands, and a lower stable serving for connecting the respective measurement indicator. When the first remote switch is triggered, the contact groups 7 are connected to the collectors of transistors 8 and 9 of the winding of the second remote switch. The second remote switch triggers and a second source of information is connected to the channel connecting the next amplitude pulse from the receiving half. When a command is received, the amplitude of which causes the breakdown of Zener diodes 10 and 11, the transistor 9 opens first and the baffle windings are powered and provide a consistent return of all remote switches to the initial state. The priority in the operation of the transistor 9 in front of the transistor 8 is provided by capacitors 32, which delay the operation of the operating windings, and diode 14. Thus, the zener diodes 10 and 11 together with the capacitors 32 and

diode 14 selects commands by amplitude. The initial setting of the remote switches of all monitored points to the initial state is accomplished by pressing the button 44 by sending a stop pulse of negative polarity of known greater amplitude. Zener diodes 16 provide protection for the base circuits of transistors 8 and 9 against overvoltages.

The shunting of the capacitors 22 and 45 of the secondary winding of the transformer 1 .1 and FIG. 2) allows you to increase the load of the transformer at the time of transmission of DC pulses, which causes a decrease in the constant time of the whole circuit, therefore the duration of the elementary parcel is reduced to

2-3 sec. Since each team consists of one elementary parcel, the time for calling one controlled point in this case does not exceed 5-10 s, which is several times lower than

compared with the known device.

Claims (2)

 Invention Formula A device for transmitting and receiving television signals, containing on the transmitting side a cathodic protection unit, the first output of which is connected through the primary winding of the transformer to the high-voltage line, is connected via a capacitor to the pipeline, the terminals of the secondary winding of the transformer are connected to one input of the remote switch unit, the other input is connected to the pipeline and to the corresponding inputs of the cathodic protection unit and the remote switch unit, on the receiving side, the primary output of the primary winding tr the inverter is connected to the high-voltage line, the second output of the transformer primary winding is connected via the first capacitor to the pipeline, to the first outputs of the indicators and to the first output of the coil relay-former, the second output of which is connected to the second output of the transformer primary through contacts of the switch and the contact of the transformer, the first output of the coil of the reformer through the second capacitor is connected to the second input of the switch, the second outputs of which are connected to the second outputs of the corresponding indicators and through the first contact of the relay -former to the button contact, characterized in that, in order to increase the speed of information transfer, remote switches are introduced on the transmitting side, transistors zener diodes and resistors, the emitters of the transistors are connected to the same positive terminal of the power source, the collectors of the transistors are connected to the negative terminals of the power source, the bases of the transistors through the corresponding individual terminals through the corresponding contacts of the remote switches The zener diodes are connected via a common zener diode. To the emitters of the transistors and through successively connected resistors and a diode to the input of the cathodic protection unit, a chain of series-connected capacitors and a contact switch is connected in parallel to the secondary windings. A source of different voltage ratings, a capacitor and switch contacts are inputted on the receiving side. the first input of the source of various voltage ratings is connected to a trunk | conductor, the second input is combined with the second outputs of the switch, the source outputs of various voltage ratings by key via serially connected switch contact and second switch contact with a shaper-break contact buttons parallel terminals of the secondary winding of the transformer is connected chain of series-connected capacitor and a relay contact trete1o-formers. Sources of information taken into account during the examination 1. USSR author's certificate No. 553646, class C. 08 C 19/12, 1975. 2. USSR author's certificate on application no. 2674969 / 18-24, | cl. G 08 C 19/12, 1978 (prototype). 22 ,. df lLff19 h 6 + T T T T T T T T and