KR200429523Y1 - Power-saving power equipment - Google Patents

Abstract

Disclosed is a power-saving power device capable of removing image harmonics of a power device and improving load unbalance.

The power device according to the present invention has three coil windings, and in the coil winding structure of a three-phase AC power device in which an R coil, an S coil, and a T coil are wound in each of the winding parts, the three windings respectively include a first winding, The second winding and the third winding are wound, and in each winding, the winding coils for two different phases are wound in a zig-zag manner so that the winding coils have mutually inverted structures, thereby facilitating the flow of magnetic flux. This reduces the requirement of iron cores and reduces the loss of no-load loss, thereby preventing the waste of power.

In addition, in the present invention, the winding structure of the coil is formed in a single winding, and de-loading and zigzag connection are performed for each phase to reverse the current direction of the coil of each winding so that no-load loss and image harmonics are generated. There is an effect that can be minimized.

Power Equipment, Transformers, Video Harmonics, Zig-Zag, Windings, Coils

Description

Power-saving power equipment {POWER SAVING TYPE TRANSFORMER}

1 is a view showing a winding structure according to the present invention.

2 is a view for explaining the wiring of the winding coil according to the present invention.

3 is a view illustrating a current direction between winding coils according to the present invention.

The present invention relates to a single winding transformer. More specifically, the core shape is designed with a pentagonal winding core, and the Zig-Zag winding method is applied to the single winding transformer to remove image harmonics generated at the load end. It relates to a power-saving power device that can be.

In general, when a transformer is used, harmonics are generated in a power line due to a rapid increase in electronic products, and the harmonic component is a current larger than a phase current, and tends to be induced into a power system through a neutral wire. The current on the T phase has a phase difference of 120 degrees, so the current flowing through the neutral line is zero, and the image harmonics are a scalar sum rather than the vector sum of each phase, resulting in a tripled current value.

That is, since the phases of the image harmonics flowing in each phase are the same, the current of the scalar rather than the vector sum flows through the neutral line, whereby the current flowing through the neutral line is not zero but an overcurrent of a value larger than the phase current flows. That is, when the current (Ir) flowing in the R phase = Imsinwt, the current flowing in the S phase = Im (sinwt-120) and the current flowing in the T phase (It) = Im (sinwt-240) The sum of three harmonic currents is Ir + Is + It = 3 Im sin 3wt.

The overcurrent of the image harmonics flowing in the neutral wire causes transformer heating, neutral cable overheating, power factor drop, communication line earth potential rise, transformer loss increase, cable loss increase, transformer output decrease and generator output decrease. As a device for removing harmonics in such a power line, a power receiving facility expansion, an input isolation transformer, a passive filter, and an active filter are used. In this case, the manufacturing cost of the transformer is increased.

In addition, one of the characteristics of the transformer is the loss of the core due to the no-load current, the loss of the transformer capacity, the noise of the transformer, shortening the life of the transformer and operating costs due to the no-load current, loss due to the no-load current In order to reduce the cost, it can be achieved by changing the quality of the core, the shape of the core and the lamination method, but this also increases the manufacturing cost of the transformer.

On the other hand, one of the characteristics of the transformer is that when a sudden short circuit occurs in the secondary circuit of the transformer, a short circuit current flows, and the magnitude of the current is determined by the circuit, the impedance of the transformer and the voltage phase of the short circuit. That is, since the impedance of the transformer is almost an inductive reactance component, the phase of the short circuit current drops by 90 ° with respect to the voltage, and when the voltage is zero, a short circuit occurs. The DC component is gradually attenuated by the resistance of the circuit, but disappears within several cycles, but the initial peak value is about 1.8 times the AC peak value, and when this large short-circuit current flows in the winding, a mechanical force proportional to the current value is applied and its magnitude is increased. Is very large, and the primary (high voltage) and secondary (low voltage) windings have repulsive forces because the current directions are opposite to each other.

These sudden short circuits are caused by radial mechanical forces, internal compressive forces acting on concentrically placed windings, and axial mechanical forces, resulting in shortened transformer life and failures due to transformer burnout. There is a method of changing the winding method such as winding and changing the fastener plate thickness, but these methods also cause a rise in the manufacturing cost of the transformer, so that low-quality power is supplied to reduce the manufacturing cost, and accordingly The problem often arises in that the operating cost of the transformer is increased.

The present invention was devised to solve the above problems, and an object of the present invention is to apply a Zig-Zag winding method to a single-circuit transformer, which can eliminate image harmonics generated at a load end. In providing a device.

Another object of the present invention is to provide a power-saving power device capable of minimizing no-load loss and improving load unbalance by designing a core shape of the power-saving power device with a pentagonal core.

The power-saving power device according to the aspect of the present invention for achieving the above object, in the coil winding structure of a three-phase AC power device having three coil windings wound R coil, S coil and T coil in each winding, Three coil windings respectively wind the first winding, the second winding, and the third winding, and in each winding, the winding coils for two different phases have a mutually inverted structure in a zig-zag manner. It is characterized by being wound.

According to a preferred embodiment of the present invention, the Ra1 coil connected to the R1 terminal is partially wound on the first winding, and the remaining Ra2 and Ra3 coils are wound around the third winding, and a tab is formed between the Ra2 and Ra3 terminals to the R2 terminal. A Ra3 coil of the third winding is connected to an Rb coil of the first winding, and the Rb coil is connected to an N2 terminal which is a common terminal; The Sa1 coil connected to the S1 terminal is partially wound on the second winding, and the remaining Sa2 and Sa3 coils are wound around the first winding, and a tab is formed between the Sa2 and Sa3 to be connected to the S2 terminal. The Sa3 coil is connected to the Sb coil of the second winding, the Sb coil is connected to the N2 terminal which is a common terminal, and the Rb coil and the Sa3 coil of the first winding are wound in opposite directions to each other so that the direction of the flowing current is different. The Ra1 coil and the Sa2 coil are also wound in opposite directions to different directions of current; The Ta1 coil, which is connected to the T1 terminal, is partially wound on the third winding, and the remaining Ta2 and Ta3 coils are wound around the second winding, and a tab is formed between the Ta2 and Ta3 to be connected to the T2 terminal. The Ta3 coil is connected to the Tb coil of the third winding, the Tb coil is connected to the N2 terminal which is a common terminal, and includes the Sb coil of the second winding and the Ta3 coil, the Sa1 coil and Ta2 coil of the second winding. Are wound in opposite directions to different directions of current, including the Tb coil and the R3 coil of the third winding, wherein the Ta1 coil and the Ra2 coil are also wound in opposite directions so that the direction of the current is different. .

When the present invention is described with reference to the accompanying drawings as follows.

1 is a connection diagram of a power saving type power device according to the present invention. First, the power-saving power device according to the present invention is a single winding transformer, having three coil windings on a pentagonal coil core, and an R coil, an S coil, and a T coil are wound around each winding portion. Each coil is composed of a single winding, the R coil is decoupled through the tap so that the Ra coil and the Rb coil are connected in series and the Ra coil has R1 and R2 terminals. The S coils are decoupled via taps so that the Sa coils and Sb coils are connected in series, the Sa coils have S1 and S2 terminals, the T coils are tapped so that the Ta coils and Tb coils are connected in series, and the Ta coils have T1 and T2 terminals. Decentralized through In addition, the terminals of the respective Sb, Tb, and Rb coils are connected in common and connected to the N2 terminal.

Therefore, Ra and Rb coils constituting the R coil are wound by different coil windings, and Sa and Sb coils constituting the S coil and Ta and Tb coils constituting the T coil are also wound by different coil windings.

2 is a diagram showing a winding structure on a pentagonal wound core. As shown, the three windings respectively wind the first winding, the second winding and the third winding. The Ra1 coil connected to the R1 terminal is partially wound on the first winding, the remaining Ra2 and Ra3 coils are wound on the third winding, and a tab is formed between the Ra2 and Ra3 to be connected to the R2 terminal. In addition, the Ra3 coil of the third winding is connected to the Rb coil of the first winding, and the Rb coil is connected to the N2 terminal which is a common terminal.

In addition, a part of the Sa1 coil connected to the S1 terminal is wound around the second winding, and the remaining Sa2 and Sa3 coils are wound around the first winding, and a tab is formed between the Sa2 and Sa3 to be connected to the S2 terminal. In addition, the Sa3 coil of the first winding is connected to the Sb coil of the second winding, and the Sb coil is connected to the N2 terminal which is a common terminal. In this case, the Rb coil and the Sa3 coil of the first winding are wound in opposite directions to each other, and the directions of currents are different from each other, and the Ra1 coil and Sa2 coil are also wound in opposite directions to each other.

The Ta1 coil, which is connected to the T1 terminal, is partially wound on the third winding, and the remaining Ta2 and Ta3 coils are wound around the second winding, and a tab is formed between the Ta2 and Ta3 to be connected to the T2 terminal. In addition, the Ta3 coil of the second winding is connected to the Tb coil of the third winding, and the Tb coil is connected to the N2 terminal which is a common terminal. Here, including the Sb coil and the Ta3 coil of the second winding, the Sa1 coil and Ta2 coil of the second winding are wound in opposite directions to different directions of current. In addition, including the Tb coil and the R3 coil of the third winding, the Ta1 coil and the Ra2 coil are also wound in opposite directions to different directions of current.

Therefore, the current direction between the primary winding coils Ra1, Rb, Sa1, Sb, Ta1, and Tb and the secondary current coils Sa2, Sa3, Ta2, Ta3, Ra2, Ra3 are formed opposite to each other. Offset the current.

Hereinafter, the operation of the power saving power device described above will be described.

First, three-phase power (U, V, W) is input to the R1, S2, and T1 terminals, respectively. The three-phase power is applied to the Ra2 coil wound with the third winding through the Ra1 coil, which is the primary coil wound with the first winding. At this time, the Ra1 coil flows in a direction of current downward in the drawing, and the Ra2 coil flows in an upward direction in the drawing. Then, power is supplied to the Rb coil of the first winding via the Ra3 coil of the third winding, and then flows to the N2 terminal. Here, the current flows in the Ra3 coil in the upper direction of the drawing, and the current flows in the Rb coil in the lower direction of the drawing.

Meanwhile, the power applied through the S1 terminal flows downward through the Sa1 nose of the second winding and is applied to the Sa2 coil of the first winding. The Sa2 coil has a structure in which current flows in the upper direction of the drawing as the secondary winding and is inverted from the current direction of the Ra1 coil wound to the primary side. The Sa2 coil is connected to Sa3, which is the secondary coil of the first winding, and then connected to the N2 terminal through the Sb coil, which is the primary coil of the second winding. Here, as the Sa3 coil is wound so that current flows in the upper side of the drawing, the current direction is inverted with the Rb coil, which is the primary coil of the first winding.

In addition, the power applied to the T1 terminal is supplied to the Ta1 coil, which is the primary coil of the third winding, and is applied downward in the drawing. The Ta1 coil is connected to the Ta2 coil, which is the secondary coil of the second winding, to form a current flow in the upper side of the drawing. The winding direction of Ta2, which is the secondary side coil of the second winding, is wound to be inverted with the Sa1 coil, which is the primary side coil of the second winding described above, so that the mutual current directions are formed opposite.

The Ta2 coil is connected to a Ta3 coil, which is a secondary coil of the second winding, and the current direction of the Ta3 coil is formed in the upper side of the drawing. Therefore, the current direction of the Sb coil wound to the primary coil of the second winding is inverted. The Ta3 coil is connected to the Tb coil, which is the primary coil of the third winding, and then to the N2 terminal. Here, the current flowing to the Tb terminal is applied to the lower side of the drawing. For this reason, as the Ra3 coil, which is the secondary coil of the third winding, is wound in a structure inverted with the Tb coil, the direction of the mutual current is reversed.

The inversion with respect to the current direction described above indicates the polarity (direction) of the current flowing for each phase with respect to the three-phase alternating current, but may be different so that the winding direction of the winding coil is different. This is based on the premise that the power device according to the present invention is a three-phase AC power supply, but if necessary, when the DC power supply (PWM signal) is used as the input power supply of the power device, the direction of the current may be changed regardless of the winding direction of the coil. The winding direction of the coil may be changed regardless of the direction of the current.

As described above, the primary coil and the secondary coil wound by the pentagonal core have a single winding structure, and the directions of the currents between the coils wound by the respective windings are reversed. That is, as in the coil arrangement shown in FIG. 3, power applied through the R1 terminal is applied to Rb, the primary coil of the first winding, through Ra (Ra3), the secondary coil of the third winding, and the S1 terminal. The power applied through is passed through Sa (Sa3), the secondary coil of the first winding, to Sb, the primary coil of the second winding. In addition, the power applied to the T1 terminal is applied to Tb, which is the primary coil of the third winding, via Ta (Ta3), which is the secondary coil of the second winding.

Therefore, as shown in FIG. 3, the Sa coil and the Rb coil wound by the first winding have different current directions, and the Sb coil and the Ta coil wound by the second winding also have different current directions, and the third The Tb coil and Ra coil wound by the winding also have different current directions. This structure divides each phase coil of the secondary winding into 1/2 and connects it with the 1/2 coil of the other phase. The fundamental wave (120 ° phase difference) voltage and current of each phase consist of a vector sum, but the third harmonic (No phase difference) When current flows, the direction of the current flowing through the 1/2 coil wound on the same phase is reversed to cancel the current of the image harmonics. Here, the image harmonics are 3, 6, 9 ... harmonics for nonlinear loads, and prevents adverse effects on UPS, rectifiers, computers, communication devices, electronic switching equipment, and the like in advance.

As described above, the power-saving power device according to the present invention forms the core in a pentagonal winding core structure to reduce the resistance of the magnetic flux, thereby smoothing the flow of the magnetic flux, reducing the requirements of the iron core, and reducing the no-load loss. There is an effect that can prevent the waste of power.

In addition, in the present invention, the winding structure of the coil is formed in a single winding, and the de-loading process and the zigzag connection are performed for each phase so as to reverse the current direction of the coil of each winding, thereby reducing the no-load loss and the image harmonics. There is an effect that can be minimized.

Although the present invention has been illustrated and described with respect to specific preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention does not depart from the gist of the present invention claimed in the utility model registration claims. Any person with ordinary knowledge will be able to make various modifications.

Claims (6)

In the coil winding structure of a three-phase AC power device having three coil windings and wound with R coils, S coils, and T coils in each winding portion, The three coil windings respectively wind the first winding, the second winding, and the third winding, and in each winding, a winding coil for two different phases has a mutually inverted structure in a zig-zag manner. Power-saving power device, characterized in that wound up. According to claim 1, wherein the power device, A power-saving power device comprising a pentagonal winding core and the coil being wound has a single winding structure. According to claim 1, wherein the mutual inversion structure for the winding coil, Power-saving power device, characterized in that the current direction is opposite to each other to remove the image harmonic signal of each phase (U, V, W). According to claim 1, wherein the mutual inversion structure for the winding coil, Power-saving power device, characterized in that the winding direction of the coil is opposite to each other to remove the image harmonic signal of each phase (U, V, W). The image harmonic of claim 3, wherein Power-saving power device, characterized in that any one of 3,6,9 harmonics for nonlinear load. The power device according to any one of claims 1 to 4, The Ra1 coil connected to the R1 terminal is partially wound on the first winding, the remaining Ra2 and Ra3 coils are wound around the third winding, and a tab is formed between the Ra2 and Ra3 to be connected to the R2 terminal, and the Ra3 of the third winding is connected. A coil is connected with the Rb coil of the first winding, and the Rb coil is connected with the N2 terminal which is a common terminal; The Sa1 coil connected to the S1 terminal is partially wound on the second winding, and the remaining Sa2 and Sa3 coils are wound around the first winding, and a tab is formed between the Sa2 and Sa3 to be connected to the S2 terminal. The Sa3 coil is connected to the Sb coil of the second winding, the Sb coil is connected to the N2 terminal which is a common terminal, and the Rb coil and the Sa3 coil of the first winding are wound in opposite directions to each other so that the direction of the flowing current is different. The Ra1 coil and the Sa2 coil are also wound in opposite directions to different directions of current; The Ta1 coil, which is connected to the T1 terminal, is partially wound on the third winding, and the remaining Ta2 and Ta3 coils are wound around the second winding, and a tab is formed between the Ta2 and Ta3 to be connected to the T2 terminal. The Ta3 coil is connected to the Tb coil of the third winding, the Tb coil is connected to the N2 terminal which is a common terminal, and includes the Sb coil of the second winding and the Ta3 coil, the Sa1 coil and Ta2 coil of the second winding. Are wound in opposite directions to different directions of current, including the Tb coil and the R3 coil of the third winding, wherein the Ta1 coil and the Ra2 coil are also wound in opposite directions so that the directions of the currents are different from each other. Power-saving power device.

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