JPS6098610A - On-load voltage regulator - Google Patents

Abstract

PURPOSE:To reduce the material for a winding, and to minimize loss by combining a voltage-regulating transformer and a transformer with no tape and arranging a tap winding for the voltage-regulating transformer and a tap changer on the side reverse to the terminal on the primary side. CONSTITUTION:A voltage-regulating transformer 1 constituted as a three-phase apparatus and a transformer 2 with no tap are combined. With the voltage-regulating transformer 1, each phase U, V, W severally has main windings 6, phase- shifting windings 7 and tap windings 4, the main windings 6 of each phase are connected to several apex of the phase-shifting windings 7 delta-connected, and respective phase main winding 6 is connected to primary-side terminals U, V, W. With the transformer 2 with no tap, primary windings 9 and each phase are star-connected and secondary windings 8 connected to secondary-side terminals (u), (v), (w) are formed, and the primary windings 9 of several phase are connected to the tap windings 4 of each corresponding phase through the primary- side terminal ends of the main windings 6 of several corresponding phase of the voltage-regulating transformer 1 and on-load tap changers 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an on-load voltage regulator in which the installation position of an on-load tap changer is improved.

[Technical background of the invention and its problems]

In general, transformers used in DC power supplies for the electrochemical industry, such as Soudami and Aluminum, are not only required to output low voltage and large current, but also to adjust the load voltage over a wide range of output voltage, and to , it is required to shift the phase difference between the two orders to a certain fixed arbitrary angle. To adjust the voltage under load over a wide range, a method is generally used in which the output voltage is adjusted in stages by changing the turns ratio by changing the taps under load.

However, in this case, the secondary winding of the transformer in the load special voltage regulator has a low voltage and a large current, and it is generally structurally and economically difficult to provide the many taps necessary for this winding. In addition, because the tap range is wide, the pre-adjustment method and the series transformer method are commonly used as tap switching methods during load. In the former, a load-time tap-changing transformer is installed before the low-voltage, high-current transformer, and the load-time tap switching is performed to adjust the secondary voltage by changing the primary pressure of the low-voltage, train-use transformer. In the latter method, the secondary winding of a series transformer is inserted in series into the secondary circuit of a low-voltage, high-current transformer, and the secondary winding is connected to the tertiary winding of the low-voltage, high-current transformer. This method changes the secondary pressure by excitation.

Both of these methods have their advantages and disadvantages, and one method is adopted as needed, but the present invention uses a pre-adjustment method for the song title to adjust the phase difference between the primary and secondary components at a fixed arbitrary angle. Concerning improvements in the case of phase shifting to . In other words, a normal Sanwa on-load voltage regulator with phase shift that adopts the pre-adjustment method is equipped with star-connected excitation windings, and has tap windings and load tap changers coupled to these windings. A tap pH+ having a voltage regulating transformer, a main winding connected to each vertex of a triangularly connected phase shift winding to form a primary winding, and a secondary winding electromagnetically coupled to these windings: In combination with an L transformer, each terminal of the primary winding of the tagless transformer is connected to the tap winding of the voltage M4 rectifying transformer via the on-load tap changer.

However, in such a conventional system, the tap winding of the voltage n-frequency transformer and the on-load tap changer are connected to the primary terminal U.
, V, and W, which is uneconomical in terms of electrical resistance design. Since the secondary winding of an untapped transformer is still a low-voltage, high-current winding, due to its structure, it is common to wind the outermost f windings around one iron core, and the main winding and phase shift windings are wound inside this winding. It has a structure in which the winding wire is wound. For this reason, not only the dimensions of the winding structure increase, but also the ground potential of the connection points within these windings becomes high in response to sudden waves such as electric impulses, so the connection between the secondary windings and It is necessary to make the dimensions large for insulation purposes. Therefore, the inner diameter of the secondary winding becomes large, which not only increases the amount of winding material but also increases the m loss.

OBJECT OF THE INVENTION] The object of the present invention is (a) to improve the electrical resistance R1 of the tap winding and the negative tap changer, and to reduce the size of the secondary winding, reducing the amount of winding material and reducing loss. Economical t designed to reduce
↓There is one that provides a JK pressure adjustment device during loading.

Summary of the Invention] The on-load voltage regulating device according to the present invention is composed of a combination of a voltage regulating transformer and an untapped transformer, and the tap winding and tap changer of the voltage regulating transformer are connected to the primary side terminal. is characterized in that it is placed on the opposite side.

Examples of the invention] The present invention will now be described with reference to the embodiment shown in FIG.

The on-load voltage regulating device according to the present invention is composed of a combination of a voltage regulating transformer 1 configured as a ternary transformer and a tapless transformer 2 as shown in the figure. The voltage regulating transformer 1 includes a main winding 6, a phase shift winding 7, and a tap winding 4 for each phase U, V, and W. The main windings 6 of the phases are connected, and each of the phase producing windings 6 is connected to the primary terminal U.

V and Wl are connected. Therefore, the phase in which the iron core (not shown) is excited by the main winding 6 is the negative side end U.

It advances by an angle α from the ``11 pressure'' of vIW.If the winding aNz of the phase shift winding 7 is 60 and the number of turns N is the main winding, then the relationship is 3xN2 3Nt + 2N+.Therefore, 1u=aN, and N, An arbitrary phase shift angle α can be obtained by changing . 7 and the same 7d pressure phase as the main winding 6.

The untapped transformer 2 includes a negative winding 9 and a secondary winding 8 in which each phase is star-connected and connected to secondary side terminals u, v, w, and a primary winding 9 of each phase. is connected to the primary winding 6 of the main winding 6 of each corresponding phase of the voltage regulating transformer 1 through the J terminal end and the tap changer 5 on load. The connection (phase 1451 of the load/pressure adjusting device of the present invention with 74 configurations is one line as shown in the vector diagram of FIG. 2).

That is, the tap winding 4 of each phase is wound on the same core as the main winding 6 and the phase shift winding 7, and these three windings 4
．． 6.7 is the same river phase. The regulated voltage obtained from the respective winding via the on-load tap changer 5 excites the primary winding 9 of the untapped transformer 2. This excitation voltage leads the voltage at the primary terminals U, V, and W, which are in phase with the winding Ichikawa of the voltage regulating transformer 1, by an angle α.

The secondary winding 8 of the untapped transformer 2 is wound on the same core as the negative winding 9;
voltage phase. That is, as shown in the vector diagram of FIG. 4, the secondary terminals 11. The voltages of V and W are the negative terminals U and V.
, it has advanced by an angle α with respect to W.

Note that by changing the connection between the main winding 6 and the phase shift winding 7 of the voltage regulating transformer 1, the delay can be made by the angle α.
Further, by changing the winding of the winding 7, the magnitude of the angle α can be changed.

[Effects of the Invention] As described above, according to the present invention, since the tap winding of the voltage regulating transformer and the on-load tap changer are arranged and connected apart from the primary terminal, The secondary winding of a single-tapless transformer is a low-voltage, large-flow wire, so it has to be wound on the outermost side of the core due to its structure. Since only the primary winding is wound on the inner side of the winding, the inner diameter of the secondary winding can be reduced, which not only reduces the amount of winding material but also reduces loss.

[Brief explanation of drawings]

FIG. 1 is a wiring diagram showing an embodiment of the on-load voltage regulator according to the present invention, and FIG. 2 is a vector diagram thereof. 1...Voltage adjustment transformer 2...Tap transformer 4...
-Tap winding 5...Load platform tap changer 6...Main winding 7...Phase shift winding 8...Secondary winding 9...-Secondary winding

Claims (1)

[Claims] (1) Each phase is equipped with a voltage regulating transformer having a main winding, a phase shift winding, and a tapped winding, and an untapped transformer having a primary winding and a secondary winding in each phase. The main winding, phase shift winding, and tap winding of each phase of the voltage regulating transformer are connected in series with each other so that the main winding is on the primary terminal side, and the phase shift winding is triangularly connected between each phase. At the same time, one end of the primary winding of each phase of the untapped transformer is selected as the primary terminal side of the main winding of the corresponding phase of the voltage regulating transformer, and the other end is selected as the tap winding via the load tap changer. A load voltage adjustment device characterized by a 11M1 voltage adjustment device that is connected to a