SU1277408A1 - Device for transmission of information via wires of electric power lines - Google Patents

Abstract

The invention relates to electrical engineering and can be used in devices for transmitting information at tonal frequencies. The purpose of the invention is to reduce the power of a transmitted signal and eliminate the influence of transmitted signals on information transmission devices of neighboring substations. The signal from transmitter 2 is inputted into a / --Pt supply substation through transformer-3. Transformer 1 is a supply transformer. The signal is formed as the voltage drop of the signal current at the input impedance of the network (weight) relative to the busbars. The minimum BCC value is determined by the resistance of the parallel-connected suppressor circuit (AC, inductance 7 and capacitor 9) and the high voltage network (UHV, at low input resistances EHV). The maximum BCC value is determined by the resistance of a series-connected shunt circuit (coil and inductance 6 and capacitor 8) on an AC and connected in parallel to this (L BCC medium-voltage circuit (with a high input resistance of high-voltage circuits). BCC values, which allows to reduce the power of transmitter 2. Receiver 4 is connected to the wire of one of the phases of the transmission line through the current transformer 5. 1 lp. X)

Description

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The invention relates to electrical engineering, in particular, to devices for transmitting information at tonal frequencies over wires of medium voltage transmission lines according to the phase-to-phase scheme.

The purpose of the invention is to reduce the power of transmitted signals and eliminate the effect of transmitted signals on information transmission devices of neighboring substations.

 The drawing shows an electrical block diagram of a device for transmitting information through wires of power lines,

The device for transmitting information by wire transmission lines contains the first transformer 1, transmitter 2, second transformer 3, receiver 4, current transformer 5, first inductance coil 6, second inductance coil 7, first capacitor 8, second capacitor 9.

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 The device for transmitting information by wire transmission lines works as follows.

The signal is inputted at the supply substation through the second transformer 3, which is a power transformer, i.e. transformer auxiliary substation. The power transformer of this substation is the first transformer 1. The signal is organized as the voltage drop of the signal current at the input resistance of the network relative to the substation buses. The minimum value of this input resistance (at input resistances of a high voltage network is in the order of fractions of Ω) is determined by the resistance of the parallel-connected resistances of the fencing circuit formed by the second inductance coil 7 and the second capacitor 9, and the actual network 6-10 kV The input resistance of the high-voltage network is determined by the resistance of the series-connected shunt LC circuit formed by the first inductor 6 and the first coil. the capacitor 8, and the blocking circuit composed of the second inductor 7 and the second capacitor 9 and in parallel connected to this circuit of the input resistance of the medium voltage network

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Thus, sufficiently stable and high values of the input impedance of the network relative to the signal entry point are provided, which allows to reduce the power of transmitter 2. In addition, the shunt LC circuit prevents the signal from being transformed into a high-voltage supply network, thereby eliminating their influence to similar telemechanics systems in medium voltage networks, Due to the fact that the resistance of the barrier of a parallel LC circuit at tonal frequencies has a relatively small value, the transmission device Transmission over power transmission lines provides stable and close to one signal transmission factors from the medium voltage network to the supply substation, since the currents of these signals are closed along the low-impedance shunt LC circuit and also the noise level is reduced.

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Claims (2)

The invention relates to electrical engineering, in particular, to devices for transmitting information at tone frequencies over medium voltage transmission lines according to the phase-to-phase scheme. The purpose of the invention is to reduce the power of transmitted signals and eliminate the influence of transmitted signals on information transmission devices from neighboring substations. The drawing shows an electrical structural diagram of a device for transmitting information over wires of power transmission lines. A device for transmitting information over wires of power transmission lines comprises a first transformer 1, a transmitter 2, a second transformer 3, a receiver 4, a current transformer 5, a first inductor 6, a second inductor 7, the first capacitor 8, the second capacitor 9. A device for transmitting information through wires of power transmission lines works as follows. The signal is input at the power substation through the second transformer 3, which is a power transformer, i.e. transformer auxiliary substation. The power transformer of this substation is the first transformer 1. The signal is organized as the voltage drop of the signal current at the input resistance of the network relative to the substation buses. The minimum value of this input resistance (at input resistances of a high-voltage network is in the order of fractions of Ohms) is determined by the resistance in parallel with the included resistances of the fencing circuit formed by the second inductance coil 7 and the second capacitor 9, and the network itself is 6-10 kV large values of the input impedance of the high voltage network is determined by the resistance of the series-connected shunt LC circuit formed by the first inductor 6 and the first end The sensor 8 and the blocking circuit composed of the second inductance coil 7 and the second capacitor 9 and the input resistance of the medium-voltage network 1 82 connected in parallel to this circuit. Thus, sufficiently stable and high values of the input resistance of the network are obtained relative to the signal input point, which reduces transmitter power 2. In addition, the shunt LC circuit prevents the signal from being transformed into a high-voltage power supply network, thereby eliminating their effect on similar telemechanics systems in medium-voltage networks, due to the fact that the resistance of the parallel LC circuit to tones frequencies is relatively small, the information transmission device over the power transmission lines provides stable and close to one transmission factors of signals from the network of average voltage to the supply substation, since the currents quiet signal are closed by a low impedance shunt LC-circuit, and reduced noise levels. Formula of the Invention A device for transmitting information by wires of power lines,. containing on the transmitting side transformer as well as transmit. The output of which is connected to the terminals of the primary winding of the second transformer, the conclusions of the secondary winding of which are connected to the corresponding wires of the phase of the electric lines. transmission, and at the receiving side a receiver, the terminals of which are connected via a current transformer to a wire of one of the phases of the transmission line, characterized in that, in order to reduce the power of the transmitted signals and eliminate the influence of the transmitted signals on the information transmission devices of the neighboring substations, the first and second inductors, the first and second capacitors, the first output of the first inductor is connected to the first secondary terminal of the first transformer and the wire of the first phase transmission, the wire of the second phase of which is connected to the second output of the secondary winding of the first transformer, the third output of which is connected to the first output of the first capacitor and the first output of the second inductor, the second output of which is connected to the wire 31277408 The third phase of the transmission lines, combined, and the second condenser of the first capacitor, the capacitor is connected in parallel to the second and second output of the first inductor-inductor coil.