JPS63147209A - Voltage phase control transformer - Google Patents

Abstract

PURPOSE:To avoid change of the secondary terminal voltage despite the change of a phase by adding two pairs of divided windings to a voltage control transformer and choosing properly the number of turns of the divided tap winding round in another phase. CONSTITUTION:A phase controlling tap winding 12 for phase V is formed by securing connection of the number of turns between a tap winding 5 wound in phase U and a tap winding 6 wound in phase W by an amount equivalent to a single tap so that these windings are put on a circular arc where a vector OV' is defined as the radius and then repeating this combination of windings. As a result, the vector VV' of a voltage control transformer is added to the vector OV of a primary terminal voltage. Thus a vector O' is obtained. The voltage levels of the vector V'm obtained by a tap winding wound in another phase and another vector mv are selected so that a point (v) is put on a circular arc defining the OV' as the radius. Then both vectors V'm and mv are added to the OV' for acquisition of the vector Ov of the secondary terminal voltage. This vector Ov has the same voltage level as the vector Ov' and a phase differ ence alpha from the vector OV.

Description

[Detailed description of the invention] "Technical field of invention" The present invention relates to a voltage phase adjustment transformer.

"Technical background of the invention and its problems" A voltage phase adjustment transformer is a device that performs cross-current control when connecting a power system by changing the transformation ratio and phase difference between the primary and secondary sides. An example is shown in FIG. The voltage phase adjustment transformer in FIG. 4 is composed of a voltage adjustment transformer 9 and a phase adjustment transformer 10. The voltage regulating transformer 9 has a shunt winding m2, a tapped series winding 3, and a stabilizing winding 8 connected to the iron core (
(not shown). The shunt winding 1 and the pocket 2 are connected in a star shape, and the stable winding 8 is connected in a triangular manner.

On the other hand, in the phase adjustment transformer 10, an excitation winding 11 and a phase adjustment tap winding 12 are wound on an iron core (not shown). The excitation winding Pa11 has a triangular connection, and the center tap of the phase adjustment tap winding 12 is connected to the tapped series winding 3 of the voltage adjustment transformer 9 via the voltage adjustment tap changer 4. Further, the phase adjustment tap winding 12 is connected to a secondary terminal via a phase adjustment tap changer 7.

The principle of changing the transformation ratio and phase difference in the voltage phase adjustment transformer shown in FIG. 4 will be explained below with reference to the voltage vector diagram shown in FIG. 2. In FIG. 2, O indicates the neutral point, and vector oV indicates the primary terminal voltage. A vector ■■' is added to the vector O■ of the primary terminal voltage by a voltage regulating transformer to obtain a vector OV'. A vector V'f with a component perpendicular to the vector 0■' is generated by the one-digit digit adjustment transformer.
is added to the vector OV' to obtain a secondary terminal voltage vector Ov having a phase difference α from the primary terminal voltage vector ov. This phase difference α is lV'V 1 tan-1□ 10V'1. In this case, the vector OV- of the secondary terminal voltage is the vector O■ of the secondary voltage obtained by the voltage regulating transformer.
The voltage is 10V' I X (--1) CO3α greater than

``Problems to be Solved by the Invention'' The voltage phase adjustment transformer shown in FIG. 4 has the disadvantage that changing the phase also changes the secondary terminal voltage.

"Means for solving the problem" Two sets of divided tap windings are wound around a voltage regulating transformer, and the number of turns of the divided tap windings wound on the other phase is determined in Figure 2. A tap winding for phase adjustment is used, which is formed by alternately combining properly selected 11111 wires so as to lie on a circular arc having a radius of the vector o■' shown in FIG.

“Action” phase! Fl! By selecting each tap of the l tap winding so that it lies on an arc whose radius is the vector o' shown in Figure 2, it is possible to prevent the secondary terminal voltage from changing even if the phase changes. can.

"Example" The present invention will be described below with reference to an example shown in FIG. In FIG. 1, the same parts as in FIG. It is wound around the regulating transformer 9, and its configuration is different.

Next, the configuration of the phase adjustment tap winding 12 shown in FIG. 1 will be described below. In Fig. 1, the phase adjustment tap winding 112 for the V phase has a radius of vector OV' shown in Fig. M2, which is the number of turns of the tap winding 5 wound on the U phase and the tap winding 1i6 wound on the W phase. It is constructed by connecting one appropriately selected tap so that it lies on the circular arc, and repeating the combination.

The principle of changing the transformation ratio and phase difference in the voltage phase adjustment transformer shown in FIG. 1 will be explained below with reference to the voltage vector diagram shown in FIG. 3. In FIG. 3, O indicates the neutral point, and vector OV indicates the primary terminal voltage. A vector V' is added to the vector O2 of the primary terminal voltage by a voltage regulating transformer to obtain a vector 02'. Let the vector V'm obtained by the tap winding wound around one other phase and the voltage of the vector my obtained by the tap winding wound around the other phase be vector OV' as the radius. Select them appropriately so that point V is on the arc, and use vector OV' for both.
By adding to , the vector O of the secondary terminal voltage is obtained. This vector Ov of the secondary terminal voltage has the same voltage as the vector O■', and has a phase difference α from the vector oV of the primary terminal voltage. This phase difference α is lV'f1 2xsin-1□ XIOVM.

Incidentally, the same applies to the case where the voltage regulating transformer is a two-winding transformer having a star-star connection.

"Effects of the Invention" According to the present invention, it is possible to provide a voltage phase adjustment transformer with excellent characteristics in which the secondary terminal voltage does not change due to phase adjustment.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram showing one embodiment of the voltage phase adjustment transformer according to Komei, Figure 4 is a wiring diagram of a conventional voltage phase adjustment transformer, and Figures 2 and 3 illustrate the principle of voltage phase adjustment. This is a voltage vector diagram. 1...Voltage phase adjustment transformer 2...Shunt winding 3...Tapped series winding 4...Voltage adjustment tap changer 5.・・・・・・
Tap winding 6 wound around the U phase...Tap winding 7 wound around the W phase...Tap changer for phase adjustment 8...Stability winding 9... Voltage adjustment transformer 10... Phase adjustment transformer 11... Excitation winding

Claims (1)

[Claims] A star-connected single-turn voltage regulating transformer consisting of three phases, or two split into a star-star connected two-winding voltage regulating transformer.
In a voltage phase adjustment transformer in which two sets of tap windings are wound, the phase is obtained by alternately combining each set of appropriately selected turns of the divided tap windings wound on the other phases. A voltage phase adjustment transformer characterized by having an adjustment tap winding so that phase adjustment is possible without changing the secondary terminal voltage obtained by the voltage adjustment transformer.