CN203746642U

CN203746642U - Rectifier transformer adopting series winding

Info

Publication number: CN203746642U
Application number: CN201420100078.6U
Authority: CN
Inventors: 董景义; 刘洁; 李西勇
Original assignee: Shandong Dachi Electric Co Ltd
Current assignee: Shandong Dachi Electric Co Ltd
Priority date: 2014-03-06
Filing date: 2014-03-06
Publication date: 2014-07-30
Anticipated expiration: 2024-03-06

Abstract

The utility model relates to a transformer, in particular to a rectifier transformer adopting a series winding. The rectifier winding adopting the series winding comprises two transformers. The high voltage side of each transformer is provided with a series coil and a secondary coil, two series coils are connected in series, each secondary coil is connected with a converter, a balance wire turn sleeves an iron core column of each transformer, one end of the balance wire turns is connected in a two-two-connection mode, and the other ends of the balance wire columns are connected to be star points to be connected with the ground through grounding wires. The rectifier transformer solves the problems of unbalanced load, too large secondary voltage deviation, inconsistent direct current magnetic bias borne by the rectifier transformer, different harmonic contents and the like in the operation process of the rectifier transformer.

Description

A kind of rectifier transformer that adopts series connection winding

(1) technical field

The utility model relates to a kind of transformer, particularly a kind of rectifier transformer that adopts series connection winding.

(2) background technology

Present stage, to power type demand also more and more polynary change, especially, in fields such as metallurgy, electrolysis, plating, electrostatic precipitations, this has also determined the diversity of rectifier transformer.Want to guarantee that rectifier transformer moves safely and reliably, for transformer manufactory, need to solve two hang-ups, the one, rectifier transformer self structure design problem; The 2nd, the additional disturbing factor that rectifier transformer bears under operating condition condition; The two has again certain contact in some aspects.

For problem one, while carrying out in the past the design of 12 pulsating wave larger capacity rectifier transformer, be usually designed to two transformers, wherein the joint group label of is Yd11, another joint group label is Yy0; Show through practice for many years, along with the capacity of rectifier transformer increases, the difference of its secondary side voltage has the trend of increase, sometimes even in the design phase, just cannot meet protocol and standard requirement, more very it, the test measured value of ratio error has larger ratio error than design calculated value, and this is obviously extremely disadvantageous to the operation of rectifier transformer, will cause Trigger Angle imbalance, load unbalanced, harmonic content increasing degree obviously, the series of problems such as DC magnetic bias current increase.In order to address this problem, through exploration and practice for many years, draw, two magnetic circuit reluctances that two rectifier transformer iron cores cause in the deviation of the aspects such as closed assembly, colligation, clamping are not exclusively equal, are to cause ratio error test measured value main cause bigger than normal.Connecing the number of turn as for large capacity rectifier transformer secondary side " y ", " d ", to choose incorrect caused ratio error excessive, except carrying out the contrast of kinds of schemes in the Electromagnetic Design stage, can also, by separate unit products with larger capacity being divided into the means of two small-capacity products, meet user's requirement.

For problem two, operate in two rectifier transformers in 12 pulsating wave commutation system be subject to Trigger Angle difference, load not etc., the impact of circulation problem, the different problems of harmonic current content, the DC magnetic bias current problem such as in different size while flowing through the winding of neutral ground, be one of research topic of rectifier transformer designer always.

(3) summary of the invention

The utility model is in order to make up the defect of prior art, and a kind of rational in infrastructure, practical, rectifier transformer that can effectively solve the excessive and operating mode difference of two rectifier transformer ratio errors is provided.

The utility model is achieved by the following technical solution:

A kind of rectifier transformer that adopts series connection winding, it is characterized in that: comprise the first transformer and the second transformer, be provided with the first series coil and the first secondary coil in the high-pressure side of the first transformer, on three core limbs of the first transformer, be set with the first balance wire turn, be provided with the second series coil and the second secondary coil in the high-pressure side of the second transformer, on three core limbs of the second transformer, be set with the second balance wire turn, wherein the first series coil and the second series coil are connected in series and form Y shape winding, the first secondary coil is that y connects winding, it is connected with the first converter, the second secondary coil is that d connects winding, it is connected with the second converter, one end of described the first balance wire turn and the second balance wire turn links together between two by shorting stub, the other end carries out grounding connection through earth connection after being connected into respectively and connecting by shorting stub after asterism again, the output of described the first converter and the second converter links together.

The number of turn of described the first balance wire turn and the second balance wire turn is 5 circles.

The beneficial effects of the utility model are:

The one, because two net side windings of this rectifier transformer are cascaded structure, so current values equal and opposite in direction that it flows through, the payload born equates, the 2nd, for the secondary voltage deviation that reduces the process deviation of these two rectifier transformer iron cores in manufacture process and cause excessive, in these two rectifier transformer device body bottoms, near core limb Position Design balance wire turn A and B and for being connected in parallel, based on magnetic potential balance principle, guarantee that two rectifier transformers principal post unshakable in one's determination flows through identical main flux, thereby solve rectifier transformer institute's on-load imbalance in running, secondary voltage deviation is excessive, the D.C. magnetic biasing of bearing is inconsistent, the not equal problem of harmonic content, the large capacity rectification circuit system that this design is mainly used in 6kV～35kV level, is made up of two rectifier transformers.

(4) brief description of the drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is operation principle schematic diagram of the present utility model;

Fig. 2 is coil assembling schematic diagram of the present utility model.

In figure, 10 first transformers, 11 first series coils, 12 first secondary coils, 13 first balance wire turns, 14 first converters, 20 second transformers, 21 second series coils, 22 second secondary coils, 23 second balance wire turns, 24 second converters, 3 shorting stubs, 4 earth connections, 5 core limbs.

(5) embodiment

Accompanying drawing is specific embodiment of the utility model.As Fig. 1, shown in Fig. 2, this kind adopts the rectifier transformer of series connection winding, comprise the first transformer 10 and the second transformer 20, be provided with the first series coil 11 and the first secondary coil 12 in the high-pressure side of the first transformer 10, on three core limbs 5 of the first transformer 10, be set with the first balance wire turn 13, be provided with the second series coil 21 and the second secondary coil 22 in the high-pressure side of the second transformer 20, on three core limbs 5 of the second transformer 20, be set with the second balance wire turn 23, wherein the first series coil 11 and the second series coil 21 are connected in series and form Y shape winding, the number of turn of the first balance wire turn 13 and the second balance wire turn 23 is 5 circles, the first secondary coil 12 connects winding for y, it is connected with the first converter 14, the second secondary coil 22 connects winding for d, it is connected with the second converter 24, one end of the first balance wire turn 13 and the second balance wire turn 23 links together between two by shorting stub 3, the other end carries out grounding connection by passing through earth connection 4 after shorting stub 3 connections by folder after being connected into respectively asterism again, folder is used for fixing earth connection 4, the output of the first converter and the second converter links together, thereby has formed " 12 pulsating wave " rectification circuit, has realized the object that direct current is converted to interchange.

Two net side windings for being connected in series: the first series coil 11 and the second series coil 21, the rated voltage of the net side winding of each rectifier transformer is chosen by 1/2nd of supply network rated voltage, and electric current calculates according to the rated voltage of the total capacity of these two rectifier transformers and supply network; The device of these two rectifier transformers is in the situation of conditions permit, preferably be placed on a fuel tank the inside, the net side winding of two rectifier transformers is connected into by lead-in wire after " Y " at fuel tank internal, only draw three high pressure line ends and a neutral terminal, greatly simplify the structure of fuel tank outside, reduced outside contingent failure rate.For balance wire turn, first the basis maximum difference of two rectifier transformer secondary voltages in the past, converses the required magnetic flux of this difference of balance, and then extrapolates the size of balance magnetic potential , according to magnetic potential balance principle , determine the electric current that flows through in balance wire turn and the number of turn of balance wire turn (in formula: -flow through the electric current of balance wire turn, the number of turn of-balance wire turn (can select according to the technological level of the capacity of transformer and factory, recommend to get 5 circles), is just easy to determine the number of turn and the wire gauge size of balance wire turn like this according to the structure of transformer.The utility model utilizes the dynamically balanced principle of magnetic potential to guarantee the magnetic flux equal and opposite in direction flowing through in two legs 5, thereby has the more technical barrier of large deviation while efficiently solving ratio error at the trial than design, has realized the controlled object of error.

Except technical characterictic described in specification, all the other technical characterictics are those skilled in the art's known technology.

Claims

1. one kind adopts the rectifier transformer of series connection winding, it is characterized in that: comprise the first transformer (10) and the second transformer (20), be provided with the first series coil (11) and the first secondary coil (12) in the high-pressure side of the first transformer (10), on three core limbs (5) of the first transformer (10), be set with the first balance wire turn (13), be provided with the second series coil (21) and the second secondary coil (22) in the high-pressure side of the second transformer (20), on three core limbs (5) of the second transformer (20), be set with the second balance wire turn (23), wherein the first series coil (11) and the second series coil (12) are connected in series and form Y shape winding, the first secondary coil (12) connects winding for y, it is connected with the first converter (14), the second secondary coil (22) connects winding for d, it is connected with the second converter (24), one end of described the first balance wire turn (13) and the second balance wire turn (23) links together between two by shorting stub (3), the other end carries out grounding connection by passing through earth connection (4) after shorting stub (3) connection after being connected into respectively asterism again, the output of described the first converter (14) and the second converter (24) links together.

2. the rectifier transformer of employing series connection winding according to claim 1, is characterized in that, the number of turn of described the first balance wire turn (13) and the second balance wire turn (23) is 5 circles.