Electrical energy transmission system

Abstract

An electrical energy transmission system has a three-phase electric current power source generating a three-phase current including three currents of different phases, a three-phase current converting device which converts at least some of the currents, a single-wire electric current transmission line configured to transmit the converted currents to a consumer, and a balancing device configured to balance the electric currents in the three-phase current source and providing thereby a stable operation of the three-phase current power source.

Claims

1. An electrical energy transmission system comprising: a three-phase electric current power source generating a three-phase electric current including three currents having different phases; a single consumer configured to receive an electric current in a single phase; a three-phase electric current converting device configured to convert the generated three-phase electric current so as to change the phases of at least some of the three currents to obtain a converted current in a single phase; a single-wire electrical energy transmission line configured to transmit the converted three-phase electric current signal in the single phase to the single consumer configured to receive an electric current in the single phase; and means for balancing the electric current in the three-phase electric current source and providing thereby a stable operation of the three-phases current source, including maintenance of phases with an offset by 120 degrees and equal amplitudes of currents of the three-phase electric current source during the transmission to the single-wire electrical transmission line and to the single consumer receiving the electric current in the single phase.

2. An electrical energy transmission system of claim 1, wherein the balancing means include a first means provided in a first line through which one of the currents is transmitted, and a second means provided in a second line through which another of the currents is transmitted.

3. An electrical energy transmission system of claim 2, wherein said first means includes an inductance.

4. An electrical energy transmission system of claim 3, wherein said inductance is provided between the first line and a line configured to extend from the consumer.

5. An electrical energy transmission system of claim 2, wherein said second means includes a capacitance.

6. An electrical energy transmission system of claim 5, wherein said capacitance is connected between the second line and a line configured to extend from the consumer.

7. An electrical energy transmission system of claim 2, wherein said first means includes an inductance connected with the first line, and a capacitance connected with the second line.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 of the drawings is a view schematically showing a system for transmission of electrical energy generated by a three-phase electric current power source according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(2) An electrical energy transmission system according to the present invention includes a three-phase electric current power source or electrical generator which is identified as a whole with reference numeral 1 and is designed to transmit electrical energy to a consumer or an active load Rl through a single wire transmission line 2. The three-phase electric current power source generates three-phase electric current including three currents transmitted correspondingly through three wires or lines a, b, c.

(3) In order to transmit the three currents of the three-phase electric current, which currents have different phases that are offset from one another by 120 degrees, a converting device is provided in the electrical energy transmission system of the invention. The converting device includes a capacitance Ca arranged in the line a, a transformer T1 arranged in line b, and a capacitance Cc arranged in the line c. The converting device including the components Ca, T1, Cc changes the phases of at least some of the three currents, so that the current become arranged in a single phase and are transmitted through the single wire or line to the consumer or load Rl.

(4) The windings of the transformer T1 are connected inversely. Its primary winding is connected between the line or phase b and a neutral, while its secondary winding is connected between a joint output point 3 of the currents and the neutral. Voltages in the windings of the transformer T1 are in a counterphase, they are shifted by 180 degrees relative to one another.

(5) In the known electrical energy transmission system one current of a three-phase current is shifted by +60 in the line a, another current is shifted by 60 in the line c, so that the three currents in lines a, b, c have the same phase and are transmitted through the single line. This however cause a disbalance in the three-phase current power source.

(6) According to the present invention, the system includes means for balancing of electric current in the three-phase electric current source. The balancing means include an inductance La which is connected with the line a and a line coming back from the consumer. In this manner it adds inductance current to the voltage source Va without affecting the voltage, and compensates a phase shift in the current of the line or phase a of the three-phase current source 1, which phase shift is cased in the current of line or phase a cause by the capacitance Ca.

(7) The balancing means further include a capacitance Cc which is connected between the line c and the line extending back from the consumer. In this manner it adds capacitance current to the voltage source Vc without affecting the voltage and compensates a phase shift in the current of the line or phase c of the three-phase current source 1, which phase shift is caused by the inductance Lc.

(8) The capacitance Cc and the inductance La provide a balancing of currents in the three-phase current source 1 and create conditions for its stable operation, including a maintenance of phases with an offset by 120 degrees and equal amplitudes of currents of the three-phase current source or generator 1.

(9) The present invention is not limited to the details shown, since various modifications and structural changes are possible without departing in any way from the spirit of the invention.

(10) What is desired to be protected by Letters Patent is set forth in particular in the appended claims.