JPS60178519A - Phase controller - Google Patents

Abstract

PURPOSE:To prevent a tank wall from being overheated owing to leak magnetic flux from a winding easily at low cost by dividing a series winding and an exciting winding coaxially and equally by two in a specific shape. CONSTITUTION:A series transformer is constituted by providing the exciting winding 6 and series winding 7 around its iron core leg 9 successively from inside. This exciting winding 6 is divided coaxially and equally by two to form upper and lower windings 6a and 6b, which are connected in parallel so that their polarities are equalized. The series winding 7 is also divided coaxially and equally by two to form upper and lower windings 7a and 7b, and a terminal X is lead out of their connection point and connected to the shunt winding of an adjusting transformer having the corresponding phase; and the upper and lower terminals are connected to a primary terminal U and a secondary terminal (u). Then, a magnetic shield 3 is fitted on the tank wall 10 to form a magnetic path for leak magnetic flux due to a current in phase with the current of the exciting winding 6, and the magnetic flux is prevented from entering the tank wall 10 to prevent its overheating.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a phase adjuster for power, and in particular adjusts the voltage ratio between the primary side and the secondary side to be always the same, and prevents penetration into the tank wall. This paper relates to improving the distribution of leakage magnetic flux.

(Technical background of the invention and its problems) A phase adjuster is a device that controls power flow in a power system by changing the voltage phase on the primary and secondary sides. , the voltage ratio between the primary side and the secondary side may change depending on the phase angle, which may be unfavorable for system operation.

For this reason, a phase adjustment method as shown in the first straw has been proposed as a method for adjusting the phase angle without changing the voltage ratio between the primary side and the secondary side.

(P247-252, pHr)C, IBE, V
ol4.120, No, 2FEBRJJAI'LY
1973) In FIG. 1, the phase adjuster is composed of a regulating transformer 1 and a series transformer 2. The regulating transformer 1 has shunt windings 3 for each phase. Tap winding 4. A stable winding '5 is wound on the core. The stabilizing winding 5 is connected in a triangular configuration, and the tap winding 42 and the shunt winding 3 are each connected in a star configuration.

On the other hand, the series transformer 2 includes an excitation winding 6 and a series winding 7 for each phase.
After the excitation winding 6 is triangularly connected, it is connected to the tap winding 4 via a tap changer (not shown), and the series winding 7 is excited with a voltage according to the tap position. . Then, the series winding 7 has a terminal drawn out from the intermediate voltage point in the center, and is connected to the line end side of the shunt winding 3 which has the voltage of the self-phase and quadrature components, and both ends are connected to the primary and secondary terminals, respectively. Connecting.

As shown in FIG. 2, the vector diagram of the voltage in the above-mentioned configuration shows that the primary terminal voltage 8-1 and the secondary terminal voltage 8-2 are connected to the shunt winding voltage 31 and the series winding induced component at right angles thereto. Since the voltage is obtained by vectorially adding or subtracting 172 of the voltage 7-1, the voltage absolute values are equal and the phase difference is approximately proportional to the series winding induced voltage 7-1. Therefore, by operating the tap changer to change the series winding induced voltage 'Ll, the phase difference between the primary terminal voltage 8-1 and the secondary terminal voltage 8-2 can be changed while keeping the voltage absolute values the same. can be done.

The configuration shown in FIG. 3 is generally considered as a specific winding configuration of a series transformer when the above-mentioned circuit configuration is adopted. That is, the excitation winding 6. is connected to the core leg 9 from the inside. The series winding 7 is wound in this order, and the series winding 7 is coaxially divided into two parts vertically to form series windings 7a and 7b, and the terminal X is drawn out from the midpoint voltage point at the center of the series winding 7. The terminals are connected to the shunt windings (not shown) of the corresponding phases, and the upper and lower ends are each connected to one wide terminal U.

Configure by connecting to secondary terminal U.

Next, consider the current flowing through each winding and the leakage magnetic flux caused by this current. The current flowing through each winding is as shown in the current vector diagram in Figure 4.
The primary line current I flows in the upper series winding 7a, and the primary line current ■ flows in the lower series winding 7b of the series winding 7.The phase differs by the adjustment angle α, and the magnitude is An equal current I flows. The primary line current I, is divided into current 11 and current 11. Further, the current I2 is divided into a current ■t and a current IS. The current Iτ and the current 11 are equal in magnitude and opposite in direction, so they cancel each other out.

1η Furthermore, the current "I 1 I'm has the same magnitude and is directed in the direction, and the sum of the current "I t "t and the current rm written below
They cancel each other out.

Further, a current II flows through the excitation winding 6 to cancel the ampere turn caused by the current. If we separate the excitation winding current into a current with the same phase component and a current with a quadrature phase component and consider the leakage flux distribution due to each current, the leakage flux distribution due to the current with the same phase component is shown in Figure 5 ( al, as shown in (b), the distribution is the same as that of a normal transformer, and they cancel each other out at the top and bottom of the tank wall.However, the leakage magnetic flux due to the quadrature component current is caused by the ampere turns canceling each other out at the top and bottom of the series winding. As shown in Figure 6 (a) r (b+), the upper and lower parts of the tank do not cancel each other out, and the tank wall 10. tank bottom 11. iron core leg 9, and the tank wall 10. tank cover 1.
2. It circulates in the order of the iron core legs 9. And Figure 5 (a
).

As shown in (b), a magnetic shield 13 is attached to the side surface of the tank wall 10 to prevent leakage magnetic flux of the same phase component to create an upper and lower magnetic flux path to prevent the magnetic flux from entering the tank wall 10. Overheating of the wall 10 can be easily prevented.

However, as shown in FIGS. 6(a) and 6(b), it is extremely difficult to prevent leakage magnetic flux that does not cancel each other out at the top and bottom of the tank from entering the tank bottom 11 or tank cover 12. Since this is difficult, it is necessary to make the tank from a non-magnetic material to prevent the tank from overheating. However, such measures have the problem that the cost of the equipment becomes extremely high.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to easily and inexpensively prevent overheating of the tank wall due to leakage magnetic flux of the winding in the series transformer of the phase adjuster. The objective is to provide a phase adjuster that can

[Summary of the invention]

In order to achieve such an object, according to the present invention, the phase adjuster is composed of an adjustment transformer with a constant transformation ratio and a series transformer, and the series transformer is wound with an excitation winding and a series winding, The series winding is coaxially divided into two parts, top and bottom, and the intermediate voltage point is connected to the shunt winding of the corresponding phase of the regulating transformer, and both ends of the series winding are connected to separate line terminals, and the excitation winding is also connected to the shunt winding of the corresponding phase of the regulating transformer. The excitation windings are coaxially divided into upper and lower halves, these two halves of the excitation windings are connected in parallel, and the parallel-connected excitation windings are connected to the tap windings of the corresponding phases. It is characterized by easily and inexpensively preventing overheating of the tank wall due to leakage magnetic flux.

[Embodiments of the invention]

An embodiment of the phase adjuster of the present invention will be described below with reference to FIGS. 7 to 9.
This will be explained with reference to the figures. The same parts as in FIGS. 1 to 6 are designated by the same reference numerals. Although not shown, the phase adjuster includes an adjustment transformer and a series transformer. The regulating transformer has shunt windings, tap windings, and stabilizer windings for each phase wound on an iron core.

In the series transformer, as shown in FIG. 7, an excitation winding 6 and a series winding 7 are sequentially wound around core legs 9 constituting an iron core from the inside. This excitation winding 6 is coaxially divided into upper and lower halves, and an excitation winding 6a
, 6b are formed, and the respective divided windings are connected in parallel by connecting the same polarity sides, and the series winding 7 is also coaxial and divided into upper and lower halves to form series windings 7a and 7b.
Terminal X is drawn out from the intermediate voltage point, which is the central connection point of Connect to U; self≠configure.

Next, the effects of the present invention will be explained. The vector diagram of the current flowing through each winding when configured as described above is shown in the eighth figure.
The result will be as shown in the figure. A primary line current ■, flows through the upper series winding 7a, and a current I, which differs in phase from the primary line current I by the adjustment angle α but has the same magnitude, flows through the lower series winding 7b. . Further, the upper and lower excitation windings have respective L lower series windings 7a.

A current 111+11!2 flows to cancel the ampere turn due to the currents i, , I of 7b.

And the currents Ill r IB2 in the excitation windings 6a and 6b are respectively the currents I'm1+, I%1 and I&z, I
It is being synthesized by 'l12. The leakage magnetic flux due to the current G + "I of the same phase component is shown in Fig. 5 (a
) and (b) have the same distribution. However, the excitation winding 6a
, 6b current 111 + 11!2 quadrature phase component current I'm 1 , leakage magnetic flux due to IS2 is shown in Figure 9 fa
), as shown in (b). That is, the current 1'++2+ISz of the quadrature phase component of the excitation current 111+IE2 of the excitation winding 6 is the current I'l r"t.
Since the leakage magnetic flux on the tank wall cancels out each other at the top and center and between the bottom and center, the leakage magnetic flux from the tank wall cancels out each other.

Therefore, in this case, a magnetic shield 13 is installed on the surface of the tank wall 10 to prevent leakage magnetic flux due to a current having the same phase component as the current of the excitation winding and leakage magnetic flux due to a current having a right angle component. This makes it possible to easily prevent overheating of the tank wall by preventing magnetic flux from entering the tank wall.

Although the above-described embodiment has been described with the excitation winding arranged inside, it is clear that similar effects can be obtained even if the excitation winding is arranged outside the series winding.

〔Effect of the invention〕

As explained above, according to the embodiments of the present invention, overheating of the tank due to magnetic flux leakage from the windings of the series transformer can be prevented without taking expensive measures such as forming the tank with a non-magnetic material. can.

[Brief explanation of drawings]

Chiku 11 Circulation Senkoi I-F Sen-Ichi no Uchiwo Taira's machizaime = Kochozan's kasubakuzu, Figure 2 is a voltage vector diagram showing the principle of Figure 1, Figure 3 is a voltage vector diagram showing the principle of Figure 1. Figure 1 is a configuration diagram showing the arrangement of the windings of the series transformer, Figure 4 is a vector diagram of the current flowing through each winding of the series transformer in Figure 3, Figure 5 (al l (bl) and Figure 6 ( al and (b) respectively show the magnetic flux distribution due to the same phase component current and the quadrature phase component current as the excitation winding current of the series transformer shown in FIG. 1)) are the magnetic flux distribution diagrams and the seventh
The figure is a winding configuration diagram of the series transformer of the phase adjuster according to the present invention, Figure 8 is a vector diagram of the current flowing through each winding when the winding configuration is as shown in Figure 7, and Figure 9 (a). 67 shows the magnetic flux distribution when the winding configuration is used, (a) shows the current of the excitation winding and the quadrature phase component current, (bl is the magnetic flux distribution diagram. 1... ial rectifying transformer Transformer 2... Series transformer. 3... Shunt winding, 4... Tap winding. 5... Stability winding, 6, 6a, 6b... Excitation winding. 7.7a , 7b... Series winding, 9... Iron core leg. 10.11.i2... Tank wall, 3-1... Shunt winding'ra pressure. 7-1... Series winding Voltage, 8-1... Primary terminal voltage. 8-2... Secondary terminal voltage. Fig. 1 Fig. 2

Claims (1)

[Claims] In a phase regulator consisting of a regulating transformer with a shunt winding and a tap winding, and a series transformer with a series winding and an excitation winding, the series windings of the series transformer are arranged coaxially and vertically in two directions. The intermediate voltage point is connected to the shunt winding of the corresponding phase of the regulating transformer, and both ends of the series winding are connected to separate line terminals, and the excitation winding is also coaxial and divided into upper and lower halves. do,
A phase adjuster characterized in that the two divided excitation windings are connected in parallel, and each of the parallel connected excitation windings is connected to the tap winding of a corresponding phase.