CN218513301U - Polycrystalline silicon converter transformer - Google Patents

Abstract

The utility model provides a polycrystalline silicon converter transformer, include: the three-phase primary winding and the three-phase secondary winding are sleeved on the three-phase iron core respectively; the secondary windings of each phase are single-phase secondary windings, and the single-phase secondary windings of the three phases are mutually electrically independent and are mutually insulated; each phase of the primary winding is split into two windings along the axial direction of the iron core, the two windings are respectively a first primary winding and a second primary winding, and the split first primary winding and the split second primary winding in each phase are connected in parallel or in series. The utility model provides a polycrystalline silicon converter transformer can use as 10kV or 20kV product simultaneously, therefore greatly reduced user's investment cost, specially adapted reforms transform into the polycrystalline silicon manufacturing enterprise of 20kV electric wire netting from 10 kV. Meanwhile, the best electromagnetic ampere-turn balance can be obtained to the maximum extent no matter the working condition is 10kV level or 20kV level power receiving state.

Description

Polycrystalline silicon converter transformer

Technical Field

The utility model relates to a technical field of converter transformer, concretely relates to polycrystalline silicon converter transformer.

Background

With the increasing of the national policy requirements for energy saving and consumption reduction, the realization of the polysilicon clean production process with low energy consumption, low cost and high quality is urgent and imperative. According to the current situation, the development direction of 'optimizing reduction process and reducing reduction power consumption' is taken as the first point to realize energy conservation and consumption reduction in the polysilicon industry, so that a great deal of research is carried out on a plurality of pairs of rod high-power reduction furnaces. The polycrystalline silicon converter transformer is characterized in that each secondary winding runs independently and supplies power for different silicon rod combinations of a reducing furnace respectively, the magnitude of load current is changed by controlling the trigger angle of a thyristor, and in the power supply process, about 30-75% of 3-time current and 7-time harmonic waves with variable quantity can be generated in the winding due to the on-off operation of the thyristor; in addition, in the operation process, the growth speeds of the silicon rods of all phases are possibly inconsistent, so that the three phases of the transformer can operate in an unbalanced manner for a long time, and even the transformer can operate in a phase-lacking manner; therefore, the above-described operational characteristics of the transformer need to be considered in designing the transformer.

The prior art has the following defects:

1. with the rapid development of the polysilicon industry, the power consumption is increased rapidly, the load density is increased continuously, the 10kV power supply is adopted, the requirements of load development are difficult to adapt to in the aspects of power supply capacity, power supply distance, line loss and the like, and the requirement of improving the voltage grade of a distribution system in the polysilicon industry is increasingly shown.

2. In the traditional technology, all secondary windings of a polycrystalline silicon current-variable dry type transformer adopt a foil winding structure, the foil windings are formed by winding extremely thin foils, each turn of wire can be regarded as a copper plate (or an aluminum plate) with a large area, and the foil winding has a strong diamagnetic effect, the diamagnetic effect pushes transverse magnetic leakage pole force at two ends of the secondary windings to two ends of the windings, so that the transverse magnetic leakage quantity at the ends of the windings is reduced, the magnetic field distribution at the ends of the foil winding low-voltage windings is shown in figure 1.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a polycrystalline silicon converter transformer, polycrystalline silicon converter transformer can realize switching and receive the electricity under two kinds of voltage systems of 10, 20kV, solves among the prior art magnetic leakage simultaneously and arouses local eddy current loss when passing secondary winding tip to concentrate and cause local temperature rise high difficult problem such as too much.

In order to solve the technical problem, the utility model discloses a following technical scheme:

in a first aspect, the present invention provides a polysilicon converter transformer, including:

the three-phase primary winding and the three-phase secondary winding are sleeved on the three-phase iron core respectively;

the secondary windings of each phase are single-phase secondary windings, and the single-phase secondary windings of the three phases are mutually electrically independent and are mutually insulated; or each phase of secondary side winding is split into a first secondary side winding and a second secondary side winding along the axial direction of the iron core, six single-phase secondary side windings are formed in a conformal manner, and the six single-phase secondary side windings are mutually independent and are insulated from each other;

each phase of the primary winding is split into two windings along the axial direction of the iron core, wherein the two windings are a first primary winding and a second primary winding respectively; when the polycrystalline silicon converter transformer is in a first state, the first primary winding and the second primary winding which are split in each phase are connected in parallel, and when the polycrystalline silicon converter transformer is in a second state, the first primary winding and the second primary winding which are split in each phase are connected in series.

Further, the first primary winding and the second primary winding are distributed in a centrosymmetric manner along the axial direction of the iron core; and the first primary winding and the second primary winding both comprise a plurality of sections of windings.

Further, the first primary winding and the second primary winding include a plurality of tap taps therein.

Furthermore, the head end and the tail end of the first primary winding are respectively provided with a tapping tap, and the head end and the tail end of the second primary winding are respectively provided with a tapping tap; when the polycrystalline silicon converter transformer is in a first state, a tap at the head end of the first primary winding is connected with a tap at the head end of the second primary winding, and a tap at the tail end of the second primary winding is connected with a tap at the tail end of the second primary winding; and when the polycrystalline silicon converter transformer is in a second state, the tapping tap at the tail end of the first primary winding is connected with the tapping tap at the head end of the second primary winding.

Furthermore, the primary windings of all the phases adopt a triangular connection mode.

Further, the first primary winding and the second primary winding each include 4 segments of windings.

Furthermore, at least one part of the first sub-coils in the secondary winding is wound in a foil mode, at least one part of the second sub-coils is wound by a conducting wire, and the first sub-coils and the second sub-coils are connected in series.

Furthermore, the first sub-coil of the foil type winding is made of copper foil or aluminum foil, and the second sub-coil of the wire winding is made of copper wires or aluminum wires.

Furthermore, the secondary winding comprises a plurality of gear heads.

Furthermore, the output voltage of the gear shift heads arranged from inside to outside is sequentially reduced by taking one side close to the iron core as the inner side.

The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:

the utility model provides a polycrystalline silicon converter transformer, include: the three-phase primary winding and the three-phase secondary winding are sleeved on the three-phase iron core respectively; the auxiliary side windings of each phase are single-phase auxiliary side windings, and the single-phase auxiliary side windings of the three phases are mutually electrically independent and are mutually insulated; or each phase of secondary side winding is split into a first secondary side winding and a second secondary side winding along the axial direction of the iron core, six single-phase secondary side windings are formed in a conformal mode, and the six single-phase secondary side windings are independent and insulated from each other; each phase of the primary winding is split into two windings along the axial direction of the iron core, wherein the two windings are respectively a first primary winding and a second primary winding; when the polycrystalline silicon converter transformer is in a first state, the first primary winding and the second primary winding which are split in each phase are connected in parallel, and when the polycrystalline silicon converter transformer is in a second state, the first primary winding and the second primary winding which are split in each phase are connected in series.

The polycrystalline silicon converter transformer provided by the utility model has the following advantages at least:

(1) The utility model provides a polycrystalline silicon current transformer can use as 10kV or 20kV product simultaneously, be equivalent to a two voltage product realization two product functions, therefore greatly reduced user's investment cost, be particularly useful for following the polycrystalline silicon manufacturing enterprise of 10kV transformation 20kV electric wire netting, and simultaneously, regard 20kV as distribution voltage, can cancel 35/10kV level step-down mode, directly adopt 110 (66)/20/0.4 kV power supply mode, transmission and transformation engineering investment and line loss have been reduced, improve polycrystalline silicon production technology overall arrangement, especially under the condition that load density is big, the circuit is long (note: the general polycrystalline silicon enterprise production base all builds the remote zone of keeping away from the urban area), economic benefits is more showing. Simultaneously, the utility model discloses no matter well polycrystalline silicon converter transformer's primary winding is received the electric state at 10kV level or 20kV level, can both obtain best electromagnetism ampere-turn balance to the furthest, and the winding is located the leakage magnetic field parameter all around the high central symmetry of axial reactance, inside no circulation produces.

(2) To this problem, the utility model provides a polycrystalline silicon converter dry-type transformer, secondary winding wherein adopt "foil wire thoughtlessly winds formula" structure, have solved among the prior art magnetic leakage and have aroused that local eddy current loss concentrates and cause local temperature rise high difficult problem when passing secondary winding tip.

Drawings

FIG. 1 is a prior art foil wound low voltage winding end field profile;

FIG. 2 is a magnetic field distribution diagram of the end of the middle foil wire mixed winding type low-voltage winding of the present invention;

FIG. 3 is a schematic diagram of a winding scheme of a primary winding and a secondary winding;

fig. 4a is a front view of the winding scheme of fig. 3;

FIG. 4b is a side view of the winding scheme of FIG. 3;

FIG. 5 is a schematic diagram of another winding scheme for the primary winding and the secondary winding;

fig. 6a is a front view of the winding scheme of fig. 5;

fig. 6b is a side view of the winding scheme of fig. 5;

FIG. 7 is a schematic winding diagram of a primary winding of a polysilicon inverter transformer;

FIG. 8a is a schematic view of an out-tap position of a tap in the primary winding of FIG. 7;

FIG. 8b is a schematic view of another tap position of the tap in the primary winding of FIG. 7;

FIG. 9 is a top view of the tap position of the tap in the primary winding of FIG. 7;

FIG. 10 is a schematic diagram of the connection of the primary winding when receiving 10kV power;

fig. 11 is a schematic diagram of the connection of the primary winding when 20kV is powered.

Reference numerals:

a primary winding 1, a secondary winding 2, an iron core 3, a tapping tap 4 and a gear tap 5;

a first coil sub-coil 21 and a second coil sub-coil 22.

Detailed Description

For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the present invention.

The polysilicon converter transformer provided by the present invention is further explained with reference to fig. 1 to 11.

In a first aspect, the present invention provides a polysilicon converter transformer, including:

the three-phase winding comprises a three-phase iron core 3, and a three-phase primary winding 1 and a three-phase secondary winding 2 which are respectively sleeved on the three-phase iron core 3; each phase of the secondary winding 2 is a single-phase secondary winding, and the three phases of the single-phase secondary windings 2 are mutually independent and insulated; or each phase of the secondary winding 2 is split into a first secondary winding and a second secondary winding along the axial direction of the iron core 3, six single-phase secondary windings are formed together, and the six single-phase secondary windings are independent from each other and are insulated from each other; each phase of the primary winding 1 is split into two windings along the axial direction of the iron core 3, wherein the two windings are respectively a first primary winding and a second primary winding; when the polycrystalline silicon converter transformer is in a first state, the first primary winding and the second primary winding which are split in each phase are connected in parallel, and when the polycrystalline silicon converter transformer is in a second state, the first primary winding and the second primary winding which are split in each phase are connected in series.

According to some embodiments of the present invention, the first primary winding and the second primary winding are distributed in a central symmetry along the axial direction of the iron core 3; and the first primary winding and the second primary winding both comprise a plurality of sections of windings.

According to some embodiments of the present invention, the first primary winding and the second primary winding comprise a plurality of tap taps 4 therein.

To the adoption 10kV power supply of writing in the background art, from the technical problem that aspects such as power supply capacity, power supply distance and circuit loss have been difficult to adapt to the load, the utility model provides a polycrystalline silicon converter transformer that can realize two voltage conversion, including three-phase iron core 3 and establish respectively in the polycrystalline silicon converter transformer three-phase primary winding 1 and three-phase secondary winding 2 on the three-phase iron core 3. Each phase of the primary winding 1 is split into two windings along the axial direction of the iron core 3, wherein the two windings are respectively a first primary winding and a second primary winding. The secondary winding 2 of each phase is a single-phase secondary winding, the single-phase secondary windings 2 of three phases are electrically independent and insulated from each other, and the winding scheme is shown in fig. 3, 4a and 4 b. Or each phase of the primary winding 1 is split into two windings along the axial direction of the iron core 3, wherein the two windings are respectively a first primary winding and a second primary winding. Each phase of the secondary winding 2 is split into a first secondary winding and a second secondary winding along the axial direction of the iron core 3, six single-phase secondary windings are formed in a conformal manner, and the six single-phase secondary windings are independent from each other and insulated from each other, and the winding scheme is as shown in fig. 5, 6a and 6 b.

To the polycrystalline silicon project construction that is 10kV polycrystalline silicon distribution network at present and will reform transform into 20kV polycrystalline silicon distribution network newly-increased in the future, the utility model provides a polycrystalline silicon current transformer can realize non-synchronization and connect to 10, two kinds of voltage system of 20kV level and receive the electricity alternate occasion. The polycrystalline silicon converter transformer splits a three-phase primary winding 1 into two windings along the axial direction of an iron core 3, and the two windings are respectively marked as a first primary winding and a second primary winding, and the first primary winding and the second primary winding are distributed in a central symmetry manner along the axial direction of the iron core 3; and the first primary winding and the second primary winding both comprise a plurality of sections of windings, and the plurality of sections of windings comprise a plurality of tapping taps 4. The utility model discloses in through changing first primary winding with the connection relation between the second primary winding to realize switching the receiving under two kinds of voltage system of 10, 20 kV. Specifically, the wire gauges of the wires in all the primary windings 1 are the same, the cross-sectional areas of the wires are selected according to the current requirement of 20kV, when the polycrystalline silicon converter transformer is in the first state, the power of the polycrystalline silicon converter transformer is 10kV, at this time, the first primary winding and the second primary winding are connected in parallel, when the polycrystalline silicon converter transformer is in the second state, the power of the polycrystalline silicon converter transformer is 20kV, and at this time, the first primary winding and the second primary winding are connected in series.

The utility model provides a polycrystalline silicon converter transformer can regard as 10kV or 20kV product to use simultaneously, realize two product functions in other words a two voltage product, therefore greatly reduced user's investment cost, and is particularly suitable for follow the polycrystalline silicon manufacturing enterprise that 10kV reforms into the 20kV electric wire netting, and simultaneously, use 20kV as distribution voltage, can cancel 35/10kV level step-down mode, directly adopt 110 (66)/20/0.4 kV power supply mode, transmission and transformation engineering investment and line loss have been reduced, improve polycrystalline silicon production technology overall arrangement, especially under the circumstances that load density is big, the circuit is long (note: general polycrystalline silicon enterprise production base all builds the remote zone of keeping away from the urban area), economic benefits is more showing.

According to some embodiments of the present invention, the head end and the tail end of the first primary winding are respectively provided with a tapping tap 4, and the head end and the tail end of the second primary winding are respectively provided with a tapping tap 4; when the polycrystalline silicon converter transformer is in a first state, the tap 4 at the head end of the first primary winding is connected with the tap 4 at the head end of the second primary winding, and the tap 4 at the tail end of the second primary winding is connected with the tap 4 at the tail end of the second primary winding; and when the polycrystalline silicon converter transformer is in a second state, the tap 4 at the tail end of the first primary winding is connected with the tap 4 at the head end of the second primary winding.

According to some embodiments of the present invention, the tapping taps 4 disposed at the head end and the tail end of the first primary winding and the second primary winding are disposed at the high-voltage side of the polysilicon converter transformer; and the other tapping taps 4 are arranged on the low-voltage side of the polycrystalline silicon converter transformer. When the power receiving of the polycrystalline silicon converter transformer is 10kV, the head end tapping 4 of the first primary winding and the tail end tapping 4 of the second primary winding are both input ends of 10kV, and the tail end tapping 4 of the first primary winding and the tail end tapping are both output ends of 10 kV. When the power of the polycrystalline silicon converter transformer is 20kV, the tapping 4 at the head end of the first primary winding is an input end of 20kV, and the tapping 4 at the tail end of the second primary winding is an output end of 20 kV.

According to some embodiments of the present invention, the primary winding 1 of each phase is connected in a delta connection.

According to some embodiments of the invention, the first primary winding and the second primary winding each comprise 4 windings.

Referring to fig. 7, 8a, 8b and 9, a primary winding 1 with 8-segment windings is provided as an example in the present invention to further explain the polysilicon converter transformer provided in the present invention. As shown in fig. 7, the primary winding 1 has a multi-segment layered structure, and the first primary winding includes 4 segments of windings (4 segments of windings in the upper portion of fig. 7), and the second primary winding also includes 4 segments of windings (4 segments of windings in the lower portion of fig. 7). The first end of the first primary winding is provided with a tap A, and the tail end of the first primary winding is provided with a tap X. The head end of the first primary winding is provided with a tap A ', and the tail end of the first primary winding is provided with a tap X'. The double-voltage conversion is realized by changing the connection mode of the external connecting terminal leading to the primary winding:

when the 20 kV-level power grid is connected with power, the turns of all the sections are connected in series up and down (namely, X of the upper half part of the primary winding 1 is connected with A' of the lower half part in the figure 7); the turns in all the sections are connected in parallel up and down when the power grid is powered by 10kV level (namely, in FIG. 7, the A of the upper half of the primary winding 1 is connected with the A 'of the lower half, and the X of the upper half is connected with the X' of the lower half).

Referring to fig. 7, the first primary winding and the second primary winding include a plurality of tap taps 4 therein. Specifically, the primary winding 1 adopts a segment-layer winding method, so that the hot-spot temperature rise of the winding is relatively close to the average temperature rise, the electric field intensity between each segment and each layer of the winding under the voltage levels of 10kV and 20kV is accurately calculated, the creepage distance of the resin insulation dry-type transformer is combined, the partial discharge outside the winding is reduced, the input terminal, the 20kV and 10kV outgoing terminals are placed on the high-voltage side, 1 ± 2x2.5% tapping outgoing terminals of the first primary winding and the second primary winding are placed on the low-voltage side, see fig. 8a, 8b and 9 (ABC in fig. 8a and 8b are respectively tapping taps of three head ends in three phases, and XYZ is a tapping tap of three corresponding tail ends). The coil arrangement form is reasonably improved, local electric field weak links caused by the span problems of tapping and leading wires are effectively avoided, and electric field distribution is uniform; the winding can obtain the best electromagnetic ampere-turn balance no matter the winding works under the voltage of 10kV or 20kV, no circular current is generated inside the winding, and the optimal and reasonable space utilization is obtained. Meanwhile, the reliability and stability of the operation of the product are improved, and a reliable power supply guarantee is provided for further releasing the productivity of the polycrystalline silicon.

The utility model provides a but polycrystalline silicon converter transformer of two voltage conversion has following characteristics:

(1) Under the two voltages, the capacity of the transformer is unchanged;

(2) Under the two voltages, the connection group of the transformer is unchanged;

(3) Under the two voltages, the impedance of the transformer is unchanged;

(4) Under the two voltages, the performance data of the transformer is unchanged;

(5) Under two voltages, the transformer does not have the condition of idle turn operation, namely ampere turn balance;

(6) The operation is convenient when converting from one voltage to another voltage.

Further, when the power grid of 10kV level is connected to receive power, the wiring schematic diagram of the primary winding 1 is shown in fig. 10, and when different tapping taps 4 are connected, the specific tap voltage output is shown in table 1. When the power is received by a 20 kV-level power grid, a wiring schematic diagram of the primary winding 1 is shown in fig. 11, and specific gear voltage output when different tapping taps 4 are connected is shown in table 2.

TABLE 1

Tapping gear	Tap	4 position	High voltage V
				Ⅰ	2-3/2'-3'	10500
Ⅱ	3-4/3'-4'	10250
			Ⅲ	4-5/4'-5'	10000
Ⅳ	5-6/5'-6'	9750
			Ⅴ	6-7/6'-7'	9500

TABLE 2

According to the utility model discloses a some embodiments, have at least partly first subcoil 21 to be the foil type coiling in the secondary winding 2, have at least partly second subcoil 22 to be the wire coiling, first subcoil 21 with establish ties between the second subcoil 22. The utility model discloses in, can set up the position of second separated time circle 22 through to product design model structural research and professional magnetic field software simulation analysis and actual product operation situation to solve because the secondary winding all adopts the quality hidden danger that foil formula winding exists among the conventional art.

According to the utility model discloses a some embodiments, copper foil or aluminium foil are chooseed for use to first sub-coil 21 of foil formula coiling, copper conductor or aluminium conductor are chooseed for use to second sub-coil 22 of wire coiling.

According to the utility model discloses a some embodiments, including a plurality of gears in secondary winding 2 and going out first 5.

According to some embodiments of the utility model, with being close to one side of 3 unshakable in one's determination is inboard, sets up from inside to outside the gear goes out the output voltage of head 5 and reduces in proper order.

The transformer aims at solving the problem that the secondary windings of the polycrystalline silicon current-converting dry type transformer in the prior art are all in a foil winding structure and have a current squeezing phenomenon. In addition, in the prior art, each phase of the secondary side winding is split into a first secondary side winding and a second secondary side winding along the axial direction of the iron core, and six single-phase secondary side windings are formed in a conformal mode.

To this problem, the utility model provides a polycrystalline silicon current conversion dry-type transformer, secondary winding 2 wherein adopts "the mixed winding formula of foil line" structure, has at least some coils (being first branch coil 21) to adopt the foil formula coiling promptly in secondary winding 2, and some coils (being second branch coil 22) adopt the wire coiling in addition, and first branch coil 21 and second branch coil 22 are gone out 5 departments at the gear and are connected with both with the bolt, make them establish ties together step by step, output required electric current, voltage. The specific structure and connection are shown in figures 3 and 5, wherein 1u4 is connected with 1u3, and 1u4 'is connected with 1u 3'; 2u4 is connected with 2u3, and 2u4 'is connected with 2u 3'; 3u4 is linked to 3u3 and 3u4 'is linked to 3u 3'. The utility model discloses well second sub-coil 22 adopts the wire coiling to form, because single wire axial dimension is less (3 ~ 14 mm), horizontal magnetic leakage can pierce through the winding smoothly, and the eddy current loss that produces on the wire is less. Furthermore, the utility model discloses in still set up minimum electric current (being the highest voltage) shelves winding in the secondary winding 2 sets up in the inboard (being close to iron core 3 side), and the voltage level reduces in proper order that other windings arrange from inside to outside and voltage level increases in proper order, electric current (namely: form to have a plurality of output gear multi-capacity section outputs). The winding method with the structure solves the problems that local eddy current loss is concentrated when magnetic flux passes through the end part of the secondary winding to cause local temperature rise and the like in the prior art, and the improved magnetic field distribution at the end part of the secondary winding is shown in figure 2. In addition, the first sub-coil 21 and the second sub-coil 22 adopt a structure of winding the inner part and the outer part separately and then assembling, and the problems of high coil winding difficulty and low efficiency caused by large product capacity can be solved. The utility model discloses in the winding structure that provides have fine manufacturability and efficiency, improved transformer overall stability, design and manufacturing process degree of difficulty greatly reduced have improved the production efficiency of product and have reduced the whole manufacturing degree of difficulty and the cost of product.

The invention is further illustrated by the following specific examples.

Example 1

In the present embodiment, a dual voltage conversion polysilicon converter transformer is provided, and referring to fig. 7, the primary winding 1 and the secondary winding 2 are as follows:

the number of turns of one, four, five and eight segments in the primary winding 1 is equal, and the number of turns of two, three, six and seven segments in the primary winding 1 is equal; when the power is connected with a 20 kV-level power grid to receive power, all the sections are connected in series up and down for use (namely, the sections are connected in series from one to eight); when the power is supplied to a 10 kV-level power grid, all the sections are connected in parallel up and down (namely, the sections are connected in series from one to four to form an upper half part, the sections are connected in series from five to eight to form a lower half part, and then the upper half part and the lower half part are connected in parallel together). The wire gauges of all the sections of the primary winding 1 are the same, and the sectional area of the wire is selected according to the current requirement of 20kV level (note: when the 10kV level is electrified, the current is twice of 20kV, so that all the sections are connected in parallel up and down and can bear the current of 10kV level). In addition, when the secondary winding 2 is designed to output process parameters, the current and the voltage of the maximum current gear and the minimum current gear are considered according to a multiple relation, when the polycrystalline silicon converter transformer is designed, the secondary winding 2 can be made of a copper conductor, and the optimization can be realized in a single-wire (foil) single-winding mode and a double-wire (foil) parallel-winding mode by using wires with minimum specifications, so that the processing process difficulty and the purchase cost in production are reduced.

Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and the like in the description of the invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.

Claims (10)

1. A polysilicon converter transformer, comprising:

the three-phase primary winding and the three-phase secondary winding are sleeved on the three-phase iron core respectively;

the auxiliary side windings of each phase are single-phase auxiliary side windings, and the single-phase auxiliary side windings of the three phases are mutually electrically independent and are mutually insulated; or each phase of secondary side winding is split into a first secondary side winding and a second secondary side winding along the axial direction of the iron core, six single-phase secondary side windings are formed in a conformal manner, and the six single-phase secondary side windings are mutually independent and are insulated from each other;

each phase of the primary winding is split into two windings along the axial direction of the iron core, wherein the two windings are respectively a first primary winding and a second primary winding; when the polycrystalline silicon converter transformer is in a first state, the first primary winding and the second primary winding which are split in each phase are connected in parallel, and when the polycrystalline silicon converter transformer is in a second state, the first primary winding and the second primary winding which are split in each phase are connected in series.

2. The polysilicon converter transformer of claim 1, wherein the first primary winding and the second primary winding are distributed in a centrosymmetric manner along the axial direction of the iron core;

and the first primary winding and the second primary winding both comprise a plurality of sections of windings.

3. The polysilicon converter transformer of claim 2, wherein the first primary winding and the second primary winding include a plurality of tap taps therein.

4. The polysilicon converter transformer as claimed in claim 3, wherein the first primary winding has a tap at its head end and a tap at its tail end, and the second primary winding has a tap at its head end and a tap at its tail end;

when the polycrystalline silicon converter transformer is in a first state, a tap at the head end of the first primary winding is connected with a tap at the head end of the second primary winding, and a tap at the tail end of the second primary winding is connected with a tap at the tail end of the second primary winding;

and when the polycrystalline silicon current transformer is in a second state, the tapping tap at the tail end of the first primary winding is connected with the tapping tap at the head end of the second primary winding.

5. The polysilicon converter transformer of claim 1, wherein said primary winding of each phase is delta-connected.

6. The polysilicon converter transformer of claim 2, wherein each of the first primary winding and the second primary winding comprises 4 segments of winding.

7. The polysilicon converter transformer of claim 1, wherein at least a portion of a first sub-winding of the secondary winding is foil wound and at least a portion of a second sub-winding of the secondary winding is wire wound, the first sub-winding and the second sub-winding being connected in series.

8. The polysilicon converter transformer of claim 7, wherein the first foil-wound sub-coil is made of copper foil or aluminum foil, and the second foil-wound sub-coil is made of copper wire or aluminum wire.

9. The polysilicon converter transformer of claim 7, wherein said secondary winding includes a plurality of tap taps therein.

10. The polysilicon converter transformer according to claim 9, wherein the output voltages of the tap positions arranged from inside to outside are sequentially decreased with one side close to the iron core as an inner side.

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