CN203103084U

CN203103084U - Power transformer

Info

Publication number: CN203103084U
Application number: CN 201320083492
Authority: CN
Inventors: 刘朝振
Original assignee: Wuhu Jinniu Electric Co Ltd
Current assignee: Wuhu Jinniu Electric Co Ltd
Priority date: 2013-02-25
Filing date: 2013-02-25
Publication date: 2013-07-31
Anticipated expiration: 2023-02-25

Abstract

The utility model provides a power transformer which comprises an iron core, a high-voltage winding and a low-voltage winding. The high-voltage winding further comprises a first winding which is a three-phase winding, and a third winding which is a three-phase winding, wherein the partial triangular connection method is adopted in the first winding and the third winding. The low-voltage winding comprises a second winding which is a three-phase winding and formed through star connection, and a fourth winding which is a three-phase winding and formed through triangular connection. The power transformer has the advantages of being convenient to mount, reliable in operation, low in cost and small in occupied space.

Description

Power transformer

Technical field

The utility model relates to transformer, particularly 24 pulse wave rectifier power transformers.

Background technology

The rectifying installation that industrial DC power supply major part all is made up of by rectifier transformer and rectifier AC network obtains, and be widely used in fields such as metallurgy, chemical industry and traction, as the DC Transmission of urban track traffic, steel mill electric machine, the DC excitation of synchronous machine etc.The effect of rectifier transformer is that ac grid voltage is transformed into the needed voltage of rectifying device, and the conversion by the number of phases and phase angle, improves the operation characteristic of AC and DC side.Rectifier transformer can be kept apart rectifying installation and electrical network circuit, guarantee the safety of equipment, and limiting short-circuit current reduces rectifying installation to electrical network and the mutual electromagnetic interference of other parallel running rectifying installations, suppresses the current-rising-rate of rectifier cells such as thyristor.

Because the unidirectional blocking effect of rectifier cell can cause the distortion of rectifier transformer alternating magnetic field waveform, even line voltage is desirable sine wave, the electric current that rectifying device is taken from AC network also is a non-sine.The Another reason that harmonic wave produces is because nonlinear load.When electric current was flowed through linear load, electric current was with to apply voltage linear in the load; And electric current is when flowing through nonlinear load, and then electric current is a non-sinusoidal waveform in the load, has promptly produced harmonic wave.Increasing the number of phases or the pulse number of current converter, is to reduce the highly effective measure that current converter produces harmonic current.

At present since the underground railway in national many cities and urban track traffic in order to reduce harmonic wave in the electrical network, to reduce to disturb and pollute, all adopt the rectifier power source of 24 pulse waves, promptly in rectifying device, use High-Voltage Network lateral coil two rectifier transformers of different phase shifts respectively, with parallel operation after corresponding rectifier connects rectification separately, to realize 24 pulse waves.As seen, above-mentioned 24 pulse wave rectifier transformer device structure complexity, cost height, and it is big to take up room.

The utility model content

In order to solve the deficiency in the above-mentioned prior art scheme, the utility model provides that a kind of cost is low, reliable, easy for installation, floor space is little, adaptable 24 pulse wave rectifier power transformers.

The purpose of this utility model is achieved through the following technical solutions:

A kind of power transformer, described power transformer comprise iron core, high pressure winding and low pressure winding; Described high pressure winding further comprises in parallel:

First winding, described first winding comprises loop A 1, B1, C1, and the head end of described loop A 1 connects high pressure head a1, and tail end connects the intermediate ends of described coil C1, and intermediate ends connects the tail end of described coil B1; The head end of described coil B1 connects high pressure head b1, and intermediate ends connects the tail end of described coil C1; The head end of described coil C1 connects high pressure head c1;

The tertiary winding, the described tertiary winding comprises loop A 3, B3, C3, and the head end of described loop A 3 connects high pressure head a3, and tail end connects the intermediate ends of described coil B3, and intermediate ends connects the tail end of described coil C3; The head end of described coil B3 connects high pressure head b3, and tail end connects the intermediate ends of described coil C3; The head end of described coil C3 connects high pressure head c3;

Described low pressure winding comprises:

Second winding, described second winding adopts delta connection, has loop A 2, B2, C2, and low pressure head a2, b2, c2;

The 4th winding, described the 4th winding adopts star connection, has loop A 4, B4, C4, and low pressure head a4, b4, c4.

According to above-mentioned power transformer, alternatively, described high pressure winding adopts triangle or star connection.

According to above-mentioned power transformer, alternatively, described high pressure winding has three high pressure heads, is connected to the adjustable brace of gear on the high-tension coil.

According to above-mentioned power transformer, alternatively, the link that is between coil head end and the tail end is described intermediate ends.

Compared with prior art, the beneficial effect that the utlity model has is:

Axial split four winding constructions have creatively been proposed, make the phase shift angle of transformer be+7.5 degree and-7.5 degree, be equivalent to the phase-shifting rectifier transformer at two low pressure phase shifts, 30 degree angles is lumped together, not only reduced floor space, and cost is low, and is easy for installation, reliable.

Description of drawings

With reference to accompanying drawing, disclosure of the present utility model will be easier to understand.Those skilled in the art are understood that easily: these accompanying drawings only are used to illustrate the technical solution of the utility model, and are not to be intended to protection range of the present utility model is construed as limiting.Among the figure:

Fig. 1 is the first winding schematic diagram according to the utility model embodiment 1;

Fig. 2 is the vectogram according to first winding of the utility model embodiment 1;

Fig. 3 is the tertiary winding schematic diagram according to the utility model embodiment 1;

Fig. 4 is the vectogram according to the tertiary winding of the utility model embodiment 1.

Embodiment

Fig. 1-4 and following declarative description optional execution mode of the present utility model how to implement with instruction those skilled in the art and reproduce the utility model.In order to instruct technical solutions of the utility model, simplified or omitted some conventional aspects.Those skilled in the art should understand that the modification that is derived from these execution modes or replace will be in scope of the present utility model.Those skilled in the art should understand that following characteristics can make up in every way to form a plurality of modification of the present utility model.Thus, the utility model is not limited to following optional execution mode, and is only limited by claim and their equivalent.

Embodiment:

The 24 pulse wave rectifier power transformers of the utility model embodiment, described power transformer comprises:

Iron core, described iron core is the state of the art, does not repeat them here;

High pressure winding, described high pressure winding further comprise in parallel:

First winding, Fig. 1,2 has schematically provided first winding and the vectorial sketch thereof of the utility model embodiment 1, as shown in Figure 1, 2, described first winding comprises loop A 1, B1, C1, the head end of described loop A 1 connects high pressure head A, tail end connects the intermediate ends of described coil C1, and intermediate ends connects the tail end of described coil B1; The head end of described coil B1 connects high pressure head B, and intermediate ends connects the tail end of described coil C1; The head end of described coil C1 connects high pressure head C;

The tertiary winding, Fig. 3,4 has schematically provided the tertiary winding and the vectorial sketch thereof of the utility model embodiment 1, shown in Fig. 3,4, the described tertiary winding comprises loop A 3, B3, C3, the head end of described loop A 3 connects high pressure head A, tail end connects the intermediate ends (link that is between coil head end and the tail end is described intermediate ends) of described coil B3, and intermediate ends connects the tail end of described coil C3; The head end of described coil B3 connects high pressure head B, and tail end connects the intermediate ends of described coil C3; The head end of described coil C3 connects high pressure head C;

The low pressure winding, described low pressure winding comprises:

Second winding, described second winding is three phase windings, adopts delta connection, has loop A 2, B2, C2, and low pressure head a2, b2, c2;

The benefit that reaches according to the power transformer of present embodiment 1 is: after adopting axial split four winding constructions, makes the phase shift angle of transformer, reduced floor space, and cost is low for+7.5 degree and-7.5 degree, and easy for installation, reliable.

Claims

1. power transformer, described power transformer comprises iron core, high pressure winding and low pressure winding; It is characterized in that: described high pressure winding further comprises in parallel:

Described low pressure winding comprises:

The 4th winding; Described the 4th winding adopts star connection, has loop A 4, B4, C4, and low pressure head a4, b4, c4.

2. power transformer according to claim 1 is characterized in that: the link that is between coil head end and the tail end is described intermediate ends.