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INVENTION
Russian Federation Patent RU2292104

Single-wire DISTRIBUTION SYSTEM

Single-wire DISTRIBUTION SYSTEM

Name of the inventor: Michael A. Taranov (RU); Chugunov Artem (RU); Pavel Gulyaev (RU); Gulyaev Tatiana
The name of the patentee: Federal State Educational Institution of Higher Professional Education "Azov-Black Sea State Academy of Agricultural Engineering" (FSEIHPE ACHGAA)
Address for correspondence: 347740, Rostov region, Zernograd. Str. Lenin, 21, FSEIHPE ACHGAA
Starting date of the patent: 2005.05.19

Usage: to create a reliable and economical system of electricity power supply to consumers who are at a considerable distance from the power supply units. The technical result is to increase the reliability of electricity supply. The system of a single-wire distribution system, comprising a power source connected to it three-wire network, reducing single-phase transformer on a branch of the line three-wire network set boost converter composed of a power rectifier bridge whose inputs are connected to the three-wire network, the outputs of which are connected smoothing capacitance, power supply and the primary winding of the intermediate single-phase transformer in which one terminal of the secondary winding is connected to ground, and the second through a single-wire line connected to one of the terminals of the primary winding down single-phase transformer, a second terminal which is connected to ground in series with the power thyristor assembly, control input of which is connected to the anode of the rectifying diode of which cathode is connected to the terminal of the secondary winding of the locking of the matching transformer, the primary winding of which, with a parallel protection diode is included in the collector circuit of the turn-off transistor to which base through the current-limiting resistor connected to the output of NAND gate 2I one whose input is connected to the PWM generator, and the second through the inverting element is connected to a generator of rectangular pulses, to the cathode of a second rectifying diode of which anode is connected to the terminal of the secondary winding of gate matching transformer whose primary winding is, with a parallel second protection diode is included in the collector circuit gate transistor to which base through the second current-limiting resistor connected to the output of the second logic element 2I, whose inputs are connected to the PWM generator, and the generator of rectangular pulses and the second terminal of the secondary winding locks and unlocks the matching transformers and the conclusions of a non-polar zener diode connected to the cathode of the power thyristor assembly.

DESCRIPTION OF THE INVENTION

The invention relates to electrical engineering and can be used to create a reliable and economical system of electricity power supply to consumers who are at a considerable distance from the power supply units.

Distribution network is known [1], consisting of a two-wire line and earth, which is used as a third wiring network.

The disadvantage of such a network is the low reliability of electricity supply with unbalance and earth faults.

Known three phase, single phase [2], contains a power source connected to it three-wire network to which are attached two-wire branch at the end of which included lowering single-phase transformers.

Disadvantages of three phase, single phase supply is its economic inefficiency and low reliability of power supply in violation of normal operation.

Known and single-wire distribution network [3], adopted by the prototype, comprising a power source connected to it three-wire network, reducing single-phase transformer on a branch of the line three-wire network additionally installed intermediate transformer having a connection of primary windings in a "star", and secondary windings on a "open triangle" in which one of the windings included in opposition with respect to the other two windings, with one of the terminals "open triangle" is connected to ground, and the second through the one-wire line is connected to one of the terminals down the single-phase transformer, the second terminal of which is connected to ground.

The disadvantage of the single-wire distribution network is its low operational reliability of electricity supply.

The proposed invention solves the problem of increasing the operational reliability of power supply to consumers who are at a considerable distance from the power supply node, by facilitating networking.

To achieve this, the technical result in the single-wire distribution network system comprising a power source connected to it three-wire network, reducing single-phase transformer on a branch of the line three-wire network set boost converter composed of a power rectifier bridge whose inputs are connected to the three-wire network to the outputs which is connected to the smoothing capacitance, power supply and the primary winding of the intermediate single-phase transformer in which one terminal of the secondary winding is connected to ground, and the second through a single-wire line connected to one of the terminals of the primary winding down single-phase transformer, a second terminal which is connected to ground in series with power thyristor assembly, the control input is connected to the anode of a rectifying diode, the cathode of which is connected to the terminal of the secondary winding of the locking of the matching transformer, the primary winding of which is with a parallel protection diode is included in the collector circuit turn-off transistor, to the base of which through the current-limiting resistor connected to the output of the logical element 2I one input of which is connected to the PWM generator, and the second through the inverting element is connected to a generator of rectangular pulses, to the cathode of a second rectifying diode of which anode is connected to the terminal of the secondary winding of gate matching transformer whose primary winding is in parallel with the included second protection diode is included in the collector circuit gate transistor to which base through the second current-limiting resistor connected to the output of the second logic element 2I, whose inputs are connected to the PWM generator, and the generator of rectangular pulses and the second terminal of the secondary winding locks and unlocks the matching transformers and the conclusions of a non-polar zener diode connected to the cathode of the power thyristor assembly.

The figure is a circuit diagram of the proposed single-wire distribution network.

a circuit diagram of the proposed single-wire distribution network

Single-wire distribution system includes a power supply 1, a three-wire network 2, the power bridge rectifier 3-8, smoothing capacitance 9, the power supply 10, the PWM generator 11, square-wave generator 12, 2I gates 13 and 14, the inverting element 15, current-limiting resistance 16 and 17, unlocking the transistor 18 off transistor 19, the protective diodes 20 and 21, unlocking a matching transformer 22, the locking matching transformer 23, rectifier diodes 24 and 25, the non-polar zener diode 26, power thyristor assembly 27, an intermediate single-phase transformer 28, one-wire line 29 lowering single-phase transformer 30, municipal load 31, the voltage converter 32 of one phase in the three, three-phase load 33.

Single-wire DISTRIBUTION SYSTEM PROVIDES ENERGY
CONSUMERS AS FOLLOWS

Three-phase voltage from the power supply 1 through a three-wire network 2 is supplied to the power rectifier bridge 3-8. The rectified voltage is smoothed capacity 9. Then, using the power thyristor assembly 27 to the primary winding of the transformer 28 is supplied intermediate rectangular voltage required frequency. On the findings of the secondary winding of the transformer 28 is formed by the intermediate output voltage which is at the end of a single-wire line 29 is reduced step-down transformer 30 to the consumer level. Further, the voltage converter 32 by means of a single-phase three is converted into three-phase voltage that is supplied to the three-phase load 33, and layering with step-down transformer secondary winding 30-phase voltage is applied to municipal load 31. The switching frequency of the power thyristor assembly is defined by a generator of rectangular pulse 12. When the coincidence of pulses from the square wave generator 12 and the PWM generator 11, the output of logical element 2I 13 appears a series of PWM pulses, which increases unlocking transistor 18, and is supplied to the primary winding of the gate on the matching transformer 22. The secondary winding of the matching transformer 22, a gate through rectifier diode 24, a series of positive pulses is supplied to the power thyristor assembly 27 and unlocks it. When the coincidence of pulses from the inverting element 15 and the PWM generator 11, the output of logical element 2I 14 appears a series of PWM pulses, which increases turn-off transistor 19, and is supplied to the primary winding of locking the matching transformer 23. The secondary winding of the locking of the matching transformer 23 through a rectifier diode 25 series negative pulse is supplied to the power thyristor assembly 27 and locks it.

Thus, the use of single-wire distribution system not only saves scarce bimetallic wire and increase reliability of power supply at rasprostronennyh most operating conditions, but also allows to keep the feed in a symmetric mode, three-wire network.

INFORMATION SOURCES

1. Kern VV, Pospelov GE, Fedin VT The local electrical network. - Minsk: Higher School, 1972, p.11 (Scheme 1).

2. Kern VV, Pospelov GE, Fedin VT The local electrical network. - Minsk: Higher School, 1972, p.11 (Scheme 2).

3. AS RU №2205490, 7 H 02 J 3/00, H 02 H 9/00, 2003 - the prototype.

CLAIM

Single-wire distribution system, comprising a power source connected to it three-wire network, reducing single-phase transformer, characterized in that in the branch from the trunk, three-wire network set boost converter composed of a power rectifier bridge whose inputs are connected to the three-wire network, the outputs of which are connected smoothing capacity, power supply and the primary winding of the intermediate single-phase transformer in which one terminal of the secondary winding is connected to ground, and the second through a single-wire line connected to one of the terminals of the primary winding down single-phase transformer, a second terminal which is connected to ground in series with the power thyristor assembly , the control input of which is connected to the anode of the rectifying diode of which cathode is connected to the terminal of the secondary winding of the locking of the matching transformer, the primary winding of which, with a parallel protection diode is included in the collector circuit of the turn-off transistor to which base through the current-limiting resistor connected to the output of NAND gate 2I, one input of which is connected to the PWM generator, and the second through the inverting element is connected to a generator of rectangular pulses, to the cathode of a second rectifying diode of which anode is connected to the terminal of the secondary winding of gate matching transformer whose primary winding is, with a parallel second protection diode is included in collector circuit gate transistor to which base through the second current-limiting resistor connected to the output of the second logic element 2I, whose inputs are connected to the PWM generator, and the generator of rectangular pulses and second terminals of the secondary windings of the locking and unlocking the matching transformers and the conclusions of a non-polar zener diode connected to the cathode of the power thyristor assembly.

print version
Publication date 18.02.2007gg