RU2221333C2 - Data transmission device - Google Patents

Abstract

FIELD: communications engineering; data transfer over cable lines. SUBSTANCE: device has circuit for matching transceiving part with power cable, this circuit incorporating matched transformer and coupling capacitor. One of matching-transformer windings is made of ground conductor of armored cable braid and stray capacitances between armored braid and current-carrying conductors of power cable function as coupling capacitor. EFFECT: reduced space requirement for matching circuit. 1 cl, 2 dwg

Description

 The invention relates to communication technology and can be used to transmit telemetric information.

 Known devices for transmitting information, which includes a transmitter, receiver and communication line. As the latter, either a telephone line, or a fiber optic line, or a radio channel is used. The disadvantages of such devices include the need for additional installation work related to either laying a communication line or installing antenna equipment.

The closest analogue is a high-frequency communication device for high-voltage power lines (power lines). In this device, to coordinate the output of the transmitter and the input of the receiver from the power transmission line, a circuit (Fig. 1) is used from series-connected coupling coils L _s and capacitor C _s .

A disadvantage of the known device is that this option coordination of the transceiver parts of the communication system with power transmission lines cannot be used if communication is necessary via underground high-voltage cable lines (CL). This is due to the fact that the operating voltage of the capacitor C _sv should be greater than the rated voltage KL. At a rated voltage of 10 kV, such a capacitor is a bulky device for which no space is provided in the standard equipment of a transformer substation or distribution point. In this case, there is no other way to place the means of approval.

 The aim of the invention is to provide the possibility of implementing matching circuits of the output of the transmitter and input of the receiver with a communication line, which is used as a high-voltage power cable, in a compact design.

This goal is achieved in that the communication coil is made of a conductor designed to "ground" the armor braid of the high-voltage power cable. As the capacitor C _St it uses the parasitic capacitance between the cable armor braiding and its current-carrying conductors.

 Comparative analysis with the prototype shows that the claimed information transmission device is distinguished by the absence of any external high-voltage elements in it for connecting the output of the transmitter and the input of the receiver with a power cable and meets the criteria of “novelty” and “significant differences”.

 The use of parasitic capacitances between the armor braid and current-carrying conductors as a coupling capacitor leads to a positive effect, consisting in the possibility of implementing a matching circuit with a communication line in a compact design.

 The newly introduced features allow, in addition, to solve the problem associated with ensuring electrical safety of persons servicing communication equipment.

 An electrical schematic diagram of the coordination circuit of the transceiver equipment with the communication line is shown in Fig.2 (in the diagram, all current-carrying conductors of the power cable are shown in a single line).

 The output of the transmitter 1 through a high-frequency transformer T1 and capacitor C1 is connected to a current-carrying conductor KL. At another point in the communication system, the current-carrying conductor of the cable through the capacitor C2 and transformer T2 is connected to the input of the receiver 2.

 For the manufacture of transformers T1 and T2 can be used ring ferrite cores. One of the windings is wound in the usual way. The second winding is realized by "stringing" the ring core on the conductor, "grounding" the armor braid of the high-voltage power cable. Capacitors C1 and C2 are implemented without additional effort, since their role is played by the parasitic capacitance between the armor braid and current-carrying cable conductors.

 The device operates as follows. The signal from the output of the transmitter by means of a transformer T1 and a capacitor C1 excites high-frequency electrical vibrations in the cable transmission line that propagate along it. Due to this, a signal is excited through a capacitor C2 and a transformer T2 at the input of the receiver, the law of change of which repeats the law of change of the signal at the output of the transmitter. Further, this signal is processed in the receiver in the usual way. Thus, the described device does not contain previously unknown blocks and elements. The inventive device is tested in real conditions of the enterprise Novorossiysk city electric networks, where it is used as part of a telemetry system and telecontrol. The tests showed a high reliability of the communication provided by this device.

Sourse of information
1. E. A. Rudometov, V. E. Rudometov. "Electronic devices of dual use", St. Petersburg., I-in "Parchment", 1997

Claims (1)

An information transmission device comprising a transmitter, a communication line, a receiver and matching transformers, a transmitter output and a receiver input through matching transformers and coupling capacitors are connected to a communication line, the role of which is played by a high-voltage power cable, characterized in that one of the windings in each of the matching transformers implemented on the basis of the use of a conductor intended for grounding the armor cable sheath, and the capacitance between the armor sheath serves as a coupling capacitor and current-carrying conductors of the power cable.

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