SU758387A1 - Method of control of distributed objects via power transmission line wires - Google Patents

Description

The invention relates to electrical engineering and can be used in _: distribution power grids, for example, for remote control of 5 network sectional switches and, above all, in rural networks that are distinguished by their ramification, heterogeneity and a large number of power consumers. , θ

There is a method of remote control switching device, based on the filing of a code series of signals for removing voltage from the transmission line by successive outages and inclusions of the head switching device [1].

However, the implementation of this method causes interruptions in the power supply of consumers connected to this power line, which, despite their short duration, lead to a halt of production lines, such as production lines for processing feeds at livestock farms, which can only be started after residues of raw materials. In addition, the implementation of this method can lead to the failure of electric motors,

not having zero protection, which are found in agricultural production, with their unsuccessful self-starting after the restoration of stress. Thus, significant damage is caused to consumers.

The method is acceptable only for controlling the shorting switch when melting ice, where a temporary interruption in the power supply to consumers is inevitable.

The closest to the proposed method of transmitting communication signals and telemechanics is based on amplitude modulation of the voltage, the fundamental frequency by reducing the value of the positive half-wave and increasing the negative using a voltage regulator, i.e. by shifting the voltage sinusoid relative to the time axis £ 2]

This method is characterized by high complexity of implementation, which is indicated by the need to use high-speed contactless voltage regulators, whereas distribution substations are supplied with conventional contact regulators, and rural substations in most cases do not have voltage regulators at all758387

In addition, the permeability of the control signal with this method depends on the distance of the control object and the magnitude of the leaked load, which can vary during the day, and transients in the network due to the switching frequency of the voltage regulator cause distortion of the voltage sinusoid. All this may adversely affect the reliability of the sub-method.

The purpose of the invention is to simplify and increase the reliability of control. 'This goal is achieved by the fact that in the method of controlling dispersed objects through the wires of a power line using a control signal in the form of pulses with a repetition frequency coinciding with the network frequency, and the formation of pulses by introducing an asymmetry of the sinusoid of the supply voltage relative to the time axis, the control signal is formed in the form coded series of unipolar half-waves of supply current, voltage or power, followed by decoding of the transmitted series at controlled points.

Figure 1 schematically shows a device for implementing the method of figure 2 - the shape of the Phase voltage curve in the line when transmitting control signals.

The device contains valves 1, connected to wires 2 of the power line and accentuated by high-speed switches 3, plug-ins: their own control input of the program-coding unit 4, and decoders 5 are installed on the controlled objects.

. ~ .. _{in to of} ^: shunt 'switches can be used vacuum arcing chamber with an individual drive.

When the receipt of the control command from the software-coding unit 4

3 the last deshuntied transmission line, a control signal appears in the form of half-wave pulses of 6 with repetition rate; coinciding with the operating frequency of the network.

The valves can be included in one, two or three phases of a three-phase transmission line. In the latter two cases, the software-coding unit must have selectivity and bypass the valve included in one of the intact phases.

The proposed method is simple and highly reliable, since the probability of interference similar to the control signal is almost zero, and the possibility of selectively issuing a control command to the bypass switch of the intact phase makes this method • capable when one or two 20 phases break, short circuit one or two two phases on the ground or between each other, ie, almost all types of damage to the power line.

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Claims (1)

Claim The method of controlling dispersed objects through the wires of the power line, using a control signal in the form of pulses with a frequency | of the same, coinciding with the frequency of the network, and the formation of pulses by introducing asymmetry of the supply sinusoid. voltage relative to the time axis, characterized in that, in order to simplify and enhance the Reliability of control, the control signal is formed in the form of a coded series of unipolar half-waves of the supply current, voltage or power, followed by decoding of the transmitted series at controlled points.