SU392601A1 - DEVICE FOR TRANSFERING OF FREQUENCY SIGNALS ON THE ELECTRICAL POWER LINE OF VARIABLE - Google Patents

Description

one

The invention relates to telemechanics and can be used for transmitting frequency signals (commands) to additional items along a loaded AC line.

The known devices for transmitting frequency signals through an electrical AC power line have a narrow bandwidth of signals and a significant dependence of the communication channel parameters on the energy load of the line.

In order to reduce the dependence of the communication channel parameters on the energy load and expand the bandwidth in the proposed device, a power choke is included between the power input and the information entry point, having the number of equal windings in the number of power line phases, the beginnings of which are the phase input of the network and capacitors (inductors) of the connection, connected by a star. The common point of the latter is the input point of the signal relative to the null conductor.

The drawing shows a diagram of the connection elements for a three-phase network, providing channel separation.

To the beginnings of three equal windings 1–3 located on the central core of the core of the throttle, coupling capacitors 4–6 are connected, connected by a star.

Information signal receivers are attached to the sticky in a similar manner by means of capacitive stellar dividers 7-9,.

A sectioned choke does not provide inductive resistance to the load current of a three-phase network due to the mutual destruction of magnetic fluxes in the core.

At the same time, this choke is for frequency signals flowing through a capacitive star into phase conductors, a large inductive resistance, which practically prevents them from leaking into

naravlen.i to the source of power current. The pickup of information signals for transmission to executive points is carried out by means of similar groups of capacitors 7-9, W-12, etc., also connected to the phase conductors. The common points of the dividers are connected directly to the inputs of the frequency voters. Connection of power loads (symmetrical or asymmetrical) on the line section divided by the dross

Lemma should be produced to phase conductors, mine neutral conductor, although this is not strictly necessary. An autotransformer 13 is installed to decrease (or increase) the interfacial voltage at the input of the universal channel.

Subject invention

A device for transmitting frequency signals over an alternating current electrical electric power line, comprising a power input "information entry point connected through a communication reactance to a line, characterized in that, in order to expand the transmission bandwidth and reduce the dependence of the communication channel parameters on the energy

line loads, between the power input and the information input point, a choke is connected, having a number of equal-voltage windings in terms of the number of phases of the power line, the beginnings of which are the phase input of the network and the coils are connected to capacitors (inductors) of the connection It is the entry point of the signal relative to the neutral conductor of the network.