JPS60169114A - Phase adjustor - Google Patents

Abstract

PURPOSE:To prevent overheat of a tank due to leaking magnetic flux of a series transformer winding by winding two series winding units oppositely to each other and by providing the two series winding units in concentric cylindrical manner. CONSTITUTION:In a core leg 9, an exitation winding 6, a series winding unit 72 connected to a primary terminal U and a series winding unit 73 connected to a secondary terminal (u) are provided in concentric cylindrical manner of the windings in order from inside the core leg 9 toward outside. Each series winding unit 72, 73 has the same number of turns but is wound oppositely to each other and the lower parts of the series winding units 72, 73 are connected in a bundle by a terminal X to the shunt winding of the opposite phase of an adjusting transformer.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power phase adjuster, and in particular, to a phase adjuster for adjusting the phase so that the voltage ratio between the primary side and the secondary side is always the same. This invention relates to a phase adjuster capable of

[Technical Background of the Invention] A phase adjuster is a device that controls power flow in a power system by changing the voltage phase between the primary and secondary sides. The voltage ratio on the next side may change depending on the phase angle, which may be unfavorable for system operation.

Therefore, without changing the voltage ratio between the primary and secondary sides,
As a method for adjusting the phase angle, a phase adjustment method as shown in FIG. 1 has been proposed.

FIG. 1 shows a phase adjuster consisting of a regulating transformer 1 and a series transformer 2. In FIG. The regulating transformer 1 is wound with a shunt winding 3, a tap winding 4, and a stable winding 5 for each phase. The wires 3 are each connected in a star shape.

On the other hand, the series transformer 2 is wound with excitation windings 6 and series windings 7 for each phase, and the excitation windings 6 are triangularly connected and then connected through a tap changer (not shown). It is connected to the tap winding 4 and excites the series winding 7 with a voltage according to the tap position. Further, the series winding 7 has a terminal drawn out from its center (intermediate potential point) and connected to the line end side of the shunt winding 3 having a voltage of a component at right angles to its own phase, and both ends are connected to the primary, Connect to secondary terminal.

With the above configuration, as shown in the vector diagram in Figure 2,
The primary terminal voltage 81 and the secondary terminal voltage 91 are equal to orthogonal to the shunt winding voltage 31 and 1/1 of the series winding regulation voltage 71.
Since the voltages are obtained by adding or subtracting 2 vectorwise, the voltage absolute values are equal to each other, and the phase difference is approximately proportional to the series winding control voltage. Therefore, by operating the tap changer to change the series winding control voltage, it is possible to change the phase difference between the primary voltage and the secondary voltage while keeping the absolute voltage values the same.

FIG. 3 can generally be considered as a specific winding configuration of a series transformer in the case of the circuit configuration described above. That is, the excitation winding 6 and the series winding 7 are wound around the core leg 9 from the inside in this order, and the series winding is divided into two halves (winding direction is the same direction above and below), and the terminal is connected from the center (intermediate voltage point). X and connect it to the shunt winding (not shown) of the corresponding phase, and
The upper and lower ends are connected to one terminal U and two wide terminals U, respectively.

[Problems with Background Art] Now, let's consider the current flowing through each winding and the leakage magnetic flux caused by this current.

As shown in the vector diagram in Figure 4, the current flowing through each winding is such that the primary line current ■1 flows in the upper part of the series winding, and the phase of the primary line current is equal to the adjustment angle α in the lower part of the series winding. A current (2) with different magnitudes and the same magnitude flows. In addition, in the excitation winding,
A current flows to cancel the ampere turn caused by the above current.

Here, if we consider the leakage flux distribution due to the current of the same phase component as the excitation winding current and the current of the quadrature component and the current of the quadrature component, the leakage flux due to the current of the same phase component is the fifth
As shown in the figure, the distribution is the same as that of a normal transformer, and it is canceled at the top and bottom of the tank wall, but the leakage magnetic flux in the quadrature component current is in the form of ampere turns canceled at the top and bottom of the series winding. Therefore, as shown in FIG. 6, the liquid does not cancel at the top and bottom of the tank, but instead circulates along the tank wall 10 - tank bottom 11 - iron core 9 or tank wall 10 - tank cover 12 - iron core 9 path.

To deal with the leakage magnetic flux of the same phase component shown in Fig. 5, a magnetic shield 13 is installed on the side of the tank to create an upper and lower magnetic flux bus to prevent the magnetic flux from penetrating into the tank wall and prevent overheating of the tank wall. Although it can be easily prevented, leakage magnetic flux that is not canceled at the top and bottom of the tank in Figure 6 is caused by
Since it is extremely difficult to prevent the liquid from entering the tank cover 12 or the tank cover 12, it is necessary to take measures to prevent the tank from overheating, such as making the tank from a non-magnetic material.

However, manufacturing the tank from a non-magnetic material increases the cost of the equipment extremely and is not necessarily practical. In addition, the tank wall 10 is installed on the tank bottom or inside the tank cover.
Installing a similar magnetic shield is also not a desirable method because it complicates the structure of the tank.

OBJECT OF THE INVENTION The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to prevent overheating of the tank wall due to leakage magnetic flux from the windings of the series transformer. The object of the present invention is to provide a phase adjuster that has a simple structure and can effectively prevent the problem.

[Summary of the Invention] The phase adjuster of the present invention includes a series transformer wound with an excitation winding and a series winding equally divided into two series winding units, and By reversing the winding direction of the series winding units and arranging the two series winding units in a concentric cylindrical shape, it is possible to control the excitation winding current and both the in-phase component and the quadrature phase component. The magnetic flux leakage caused by this is also canceled at the top and bottom of the tank wall.

[Embodiments of the Invention] Hereinafter, an example of the phase adjuster of the present invention will be specifically explained with reference to FIG.

In FIG. 7, from the inside of the core leg 9, the excitation winding 6.1 series winding unit 72 connected to the machine terminal U, 2 the series winding unit 73 connected to the wide terminal U are arranged in the following order: The wires are wound into concentric cylinders.

Each series winding unit 72, 73 has the same number of windings, and the winding direction is opposite to each other. After the lower parts of the series winding unit 72, 73 are tied together, the X terminal is pulled out and adjusted. It is connected to the shunt winding of the corresponding phase of the transformer, and the upper part of each series winding unit 72, 73 is connected to the primary U terminal and the secondary ('') terminal, respectively.

In such a configuration, the current flowing through each winding is
As shown in the figure, a series winding unit 72 connected to the primary terminal
A primary line current 11 flows through the series winding unit 73 connected to the secondary terminal U, and a current 12 which has a phase difference from the primary line current by the regulator α but is equal in magnitude flows through the series winding unit 73 connected to the secondary terminal U. Further, a current Ig flows through the excitation winding to cancel and cover the ampere turn caused by the current.

If we consider the leakage flux distribution due to each current by separating it into a current with the same phase component as the excitation winding current and a current with a quadrature component, the leakage flux distribution of the same phase component with the excitation winding current is shown in Figure 9. This is the same distribution as a normal transformer,
It will be canceled by the top and bottom of the tank. Further, the leakage magnetic flux distribution due to the excitation winding current and the quadrature phase component current is as shown in FIG. 10, and this is also canceled at the top and bottom of the tank wall as in a normal transformer.

Therefore, according to this embodiment, the magnetic shield 13 is installed on the tank wall to prevent both the leakage magnetic flux due to the current having the same phase component as the excitation winding current and the leakage magnetic flux due to the current having the perpendicular component to the excitation winding current.
can be installed to create a magnetic flux path, prevent magnetic flux from entering the tank bottom or tank cover, and easily prevent overheating of the tank wall.

Note that the present invention is characterized in that two winding units constituting a series winding are arranged in a concentric cylindrical shape, and other points are not limited to the above embodiments. for example,
It is also possible to arrange two series winding units on the core leg side and the excitation winding on the outside.

[Effects of the Invention] As described above, according to the present invention, there are extremely simple measures such as taking into account the arrangement shape of each winding unit that constitutes the series winding, and constructing the tank from a non-magnetic material. Therefore, it is possible to provide a phase adjuster that prevents overheating of a tank due to magnetic flux torn from windings of a series transformer without taking expensive measures.

[Brief explanation of drawings]

Figure 1 is a wiring diagram of a phase regulator with a constant transformation ratio, Figure 2 is a voltage vector diagram showing the principle of a phase regulator with a constant transformation ratio, and Figure 3 is a series transformer diagram of a phase regulator with a constant transformation ratio. A winding configuration diagram, Figure 4 shows the current flowing through each winding of the series transformer shown in Figure 3, a vector diagram, Figures 5 and 6 show the excitation of the series transformer shown in Figure 3, respectively. An explanatory diagram showing the leakage flux distribution due to the winding current and the in-phase component current and the leakage flux distribution due to the quadrature phase component current, FIG. 7 is a winding configuration diagram of the series transformer according to the present invention, and FIG. A vector diagram showing the current flowing through each winding when the winding configuration is as shown in the figure. Figure 9 shows the leakage flux distribution due to the excitation winding current and the same phase component current when the winding configuration is as shown in Figure 7. The explanatory diagram, FIG. 10, is an explanatory diagram showing the leakage magnetic flux distribution due to the 11-turn excitation IJIN current and quadrature phase component current when the winding configuration shown in FIG. 7 is used. DESCRIPTION OF SYMBOLS 1... Adjustment transformer, 2... Series transformer, 3... Shunt winding, 4... Tap winding, 5... Stable winding, 6...
... Excitation winding, 7... Series winding, 31... Shunt winding voltage, 71... Series winding voltage, 81... Primary terminal voltage, 91... Secondary terminal voltage , 10...tank wall, 1
1... Tank bottom, 12... Tank cover 13...
Magnetic shield, 72.73...Series winding unit. Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 81!1 Figure 9 Figure 10

Claims (1)

[Claims] In a constant transformer ratio phase adjuster comprising an adjustment transformer and a series transformer, an excitation winding and a series winding equally divided into two series windings are connected to an iron core. The coils are wound around the legs to constitute a series transformer, and the winding directions of the two series winding units are reversed, and the two series winding units are arranged in a concentric cylindrical shape, and each A phase characterized in that one end of each series winding unit is connected together and connected to the shunt winding of the corresponding phase, and the other end of each series winding unit is connected to a primary or secondary line terminal, respectively. regulator.