Three-phased balancing device

FIELD: electric engineering, possible use in power circuits of various equipment.

SUBSTANCE: three-phased balancing device contains input and output clamps of powering networks. To output clamps, three-phased transformer is connected, primary windings of which are oppositely coupled in a zigzag. In accordance to the invention, between input and output clamps of powering network, first three-phased automatic switch is coupled, having an independent release. Serially with primary windings of three-phased transformer, second three-phased automatic switch is coupled. As zero contact for connection of phase loads, zero contact of primary windings of three-phased transformer, coupled oppositely in a zigzag, is used. Control block is connected serially to independent release, coupled between output clamp of one of the phases and zero contact of powering network, and ensures supply of voltage to independent release and activation of first automatic switch on disabling of second automatic switch.

EFFECT: increased reliability when powered from three-conductor or four-conductor powering network.

3 dwg

 

The invention relates to electrical engineering and can be used in power supply circuits of various equipment.

Known three-phase AC voltage stabilizer, containing balancing transformer [1].

The drawback is the difficulty.

Known three-phase AC voltage stabilizer, containing balancing transformer containing a primary winding connected in "star", and a secondary winding connected in the "triangle" [2].

The disadvantage is a large installed power transformer, low reliability [2].

Closest to the present invention is a three-phase symmetrise device containing the input terminals for connection to the mains supply and output terminals to which are connected three-phase transformer, the primary windings of which are connected in a "zigzag" or "star", but with the connection of the primary windings of three-phase transformer to the "star" of the secondary winding connected in a triangle, the control unit [3].

The disadvantage is the low reliability of the device when operating from a three-wire or four-wire mains, due to significant congestion balancing transformer arising from the distortions of the loads in the supply network or load on the transformer output.

The purpose of the invention is to enhance reliability of the device when RA is h from a three-wire or four-wire mains.

This objective is achieved in that in the known device containing the input terminals for connection to the mains supply and output terminals to which are connected three-phase transformer, the primary windings of which are connected in a "zigzag" or "star", but having at the same time when the connection of the primary windings of three-phase transformer to the "star" of the secondary winding connected in a triangle, the control unit, between input and output terminals included the first three-phase circuit breaker having an independent release, and in series with the primary windings of the second three-phase circuit breaker, the control unit associated with the first and second three-phase circuit breakers that supply voltage independent of the release and actuation of the first circuit breaker when disconnecting the second circuit breaker, input and conclusions the primary windings are not connected to each other, is enabled on the input or output terminals of the device.

Thus, the proposed device complies with the criteria of the invention of "novelty."

Comparison of the proposed technical solution is not only the prototype, but also with other technical solutions in this field of technology, did not reveal any sign that distinguish the claimed technical resheniia prototype that allows to make a conclusion about the technical solutions according to the criterion of "significant differences".

Figure 1 shows a diagram of the device.

The device comprises a balancing transformer 1 having a primary winding 2, 3, included in the "zigzag". Available the conclusions of the primary windings 2, 3 are connected to input terminals of the phases a, b, C. In the circuit of the primary windings 2, 3 included a three-phase circuit breaker 4. Between input and output terminals included automatic switch 5, which is independent release 6, the control unit 7 through which independent release 6 of the circuit breaker 5 is associated with a three-phase circuit breaker 4.

The device operates as follows.

When the supply voltage three-phase symmetrise unit zero output for connection phase loads is zero output of the counter included in the "zigzag" primary windings 2, 3 three-phase transformer 1. The control unit 7, which is made in the form of block contact, closing when the circuit breaker 4, connected in series with an independent trip switch 5 and is connected between the output terminal of one of the phases and the zero output of the mains, provides off a three-phase balancing device from the mains supply and the load under emergency conditions the work. Emergency modes in this case are significant asymmetry in the original mains, caused by distortions of the loads in this supply network, as well as the asymmetry of loads on the output device in excess of the allowable. Because such inclusion of the primary windings 2, 3 three-phase transformer 1 has a greater resistance to direct currents and reverse and low impedance to zero-sequence currents, i.e. provides a stable zero point and the balancing phase voltages.

Basic embodiments of the balancing transformer is shown in figure 2 and 3.

Figure 2 balancing transformer is made in the form of a transformer having a primary winding 2 connected in "star", and the secondary winding 3 are connected in a "triangle".

Figure 3 balancing transformer is made of primary windings, each of which consists of first, second and third windings, while the second and third windings are made on a "zigzag", and each of the first windings connected in opposite-consistently with the second and third windings of adjacent phases and the zero output is formed by the free connection of the conclusions of the third windings.

This embodiment of the three-phase balancing device provides a stable zero the points in three-phase network without neutral wire, eliminating the distortions of the phase voltages when the asymmetry of the load currents up to 100% of nominal, and disconnect the device from the network when the unbalance of more than nominal, and significantly reduces the resistance of the zero-sequence currents, providing the balancing of the source wire mains with zero wire and protection of the balancing device by disconnecting from the mains supply if the maximum allowable power balancing both from the mains and the load side. Technical and economic efficiency of the proposed solution is to ensure reliable operation of the balancing device as when connecting the zero wire of the power supply network with a zero output balancing device, and when creating your own zero point.

Sources of information

1. As the USSR №1324086, M CL H 02 M 5/12,1985.

2. "Electrical engineering Handbook", Moscow, publishing house of MPEI, 1998, str, RES.

3. As the USSR №1310787, M CL G 05 F 1/ 30, 1985.

Three-phase symmetrise device containing the input and output terminals of the mains, output terminals connected three-phase transformer, the primary winding of which is a counter included in a zigzag, and a control unit, characterized in that between the said input and output terminals of the mains VK is ucen first three-phase circuit breaker, with an independent release, and consistently with the specified primary windings of three-phase transformer included the second three-phase circuit breaker, with zero output for connection phase loads is zero output of the counter included in the zigzag primary windings of three-phase transformer, and the control unit is connected in series with an independent trip, connected between the output terminal of one of the phases and the zero output of the mains, and provides a voltage on an independent release and actuation of the first circuit breaker when disconnecting the second circuit breaker.



 

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