CN218182011U - Single-phase three-winding equal impedance transformer - Google Patents

Abstract

The utility model relates to a single-phase three-winding equal impedance transformer, which comprises a first iron core column, a second iron core column, a primary winding, a first secondary winding and a second secondary winding; and winding three sections of windings with the same distance and the same number of turns on the outside of the first iron leg and the second iron leg, so that the impedance of the primary winding, the impedance of the first secondary winding and the impedance of the second secondary winding are equal, namely the impedance of the transformer is equal. The utility model discloses mainly be applied to and require higher to voltage, rated capacity proportional distribution deviation, and two parallel operation's precision equipment, do not need the voltage regulator can make the voltage of equipment the same and reduce the voltage deviation, reduce cost practices thrift electric wire netting electric energy resource.

Description

Single-phase three-winding equal impedance transformer

Technical Field

The utility model belongs to the technical field of the transformer technique and specifically relates to indicate impedance transformer such as single-phase three windings.

Background

Transformers play a significant role in power and distribution systems, and are voltage and current variable devices used in the delivery of alternating current. The transformer utilizes the principle of electromagnetic induction, transfers electric energy or transmits signals from one circuit to another circuit, is an important element for electric energy transfer or signal transmission, and mainly comprises a primary coil, a secondary coil and an iron core. In electrical equipment and wireless circuits, the high-voltage power supply is commonly used for voltage lifting, impedance matching, safety isolation and the like.

In recent years, with the rapid development of economy in China, the demand of impedance transformers with 30 Hz-200 Hz frequency, such as alternating-current single-phase three-winding transformers, is increasing day by day, the impedance transformers are mainly applied to precision equipment with higher proportional distribution deviation requirements on voltage and rated capacity, two pieces of precision equipment running in parallel, such as laboratory tests or precision machine tools, and the like, voltage regulators are needed when the voltage, current and power are accurately controlled and the voltage deviation is reduced, and when a small-capacity voltage regulator is not enough to achieve the use purpose, the large-capacity voltage regulator not only has high cost, but also can possibly enable the transformer to be in a no-load state for a long time, so that no-load loss is increased, the service life of the equipment is influenced, and the waste of power grid electric energy resources is caused.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses the technical problem that will solve lies in overcoming among the prior art precision equipment voltage deviation of parallel operation big, and the low capacity voltage regulator is not enough to reach the use purpose, but the large capacity transformer is with high costs, and it is in unloaded state to probably make the transformer in addition for a long time, has increased the no-load loss, influences the problem of equipment life-span and wasted electric wire netting electric energy resource.

In order to solve the technical problem, the utility model provides a single-phase impedance transformer such as three windings, include:

iron core column: comprises a first iron core column and a second iron core column;

primary winding: the winding device is used for connecting a power supply and winding in two columns, and each column is divided into three sections of windings which comprise a first section of winding, a second section of winding and a third section of winding wound outside each iron core column;

a first secondary winding: the winding is used for connecting a load, is wound by two columns, and is divided into three sections of windings for each column, wherein each section of winding comprises a fourth section of winding, a fifth section of winding and a sixth section of winding which are wound outside each core column;

a second secondary winding: the winding is used for connecting a load, is wound by two columns, and is divided into three sections of windings by each column, wherein the seventh section of winding, the eighth section of winding and the ninth section of winding are wound outside each iron core column;

the primary winding, the first secondary winding and the second secondary winding are mutually insulated and have the same number of turns;

the primary winding, the first secondary winding and the second secondary winding are arranged outside each iron core column, the three winding intervals of the primary winding, the first secondary winding and the second secondary winding are the same, the number of turns of each winding is equal, and the cross-sectional areas of used electromagnetic wires are equal;

the tail end of the first section of winding wound outside the same iron core column is connected with the head end of the fifth section of winding through a copper bar, and the tail end of the fifth section of winding is connected with the head end of the ninth section of winding through the copper bar;

the tail end of the second section of winding wound outside the same iron core column is connected with the head end of the sixth section of winding through a copper bar, and the tail end of the sixth section of winding is connected with the head end of the seventh section of winding through the copper bar;

the tail end of the third section of winding wound outside the same iron core column is connected with the head end of the fourth section of winding through a copper bar, and the tail end of the fourth section of winding is connected with the head end of the eighth section of winding through the copper bar.

In an embodiment of the present invention, the primary winding, the first secondary winding, and the second secondary winding are wound outside the two core legs in a concentric structure.

In an embodiment of the present invention, the concentric structure of the primary winding outside each core limb is, from inside to outside, the first section of winding, the second section of winding, and the third section of winding in sequence;

the concentric structure of the first secondary winding outside each iron core column is sequentially provided with the fourth section of winding, the fifth section of winding and the sixth section of winding from inside to outside;

the second secondary winding is sequentially provided with the seventh winding section, the eighth winding section and the ninth winding section from inside to outside in a concentric structure outside each iron core column.

In an embodiment of the present invention, the primary winding, the first secondary winding, and the second secondary winding are isolated from each other by using an insulating block.

In an embodiment of the present invention, the taps of the primary winding, the first secondary winding, and the second secondary winding are all connected to the no-load voltage-regulating tap switch.

In an embodiment of the present invention, the single-phase three-winding equal-impedance transformer is a dry-type transformer.

In an embodiment of the present invention, when the tail end of the three-segment winding wound outside the first core limb of the second secondary winding is connected to the tail end of the three-segment winding wound outside the second core limb, the first core limb and the second core limb are in series connection, and the output voltage of the primary winding, the first secondary winding, and the second secondary winding is the rated voltage.

In an embodiment of the present invention, the connection mode that the tail end of the three-segment winding wound outside the first core limb of the second secondary winding and the tail end of the three-segment winding wound outside the second core limb are correspondingly connected is:

the tail end of the seventh winding section outside the first iron core column is connected with the tail end of the seventh winding section outside the second iron core column through a copper bar;

the tail end of the eighth winding outside the first iron core column is connected with the tail end of the eighth winding outside the second iron core column through a copper bar;

and the tail end of the ninth section of winding outside the first iron core column is connected with the tail end of the ninth section of winding outside the second iron core column through a copper bar.

In an embodiment of the present invention, when the tail end of the three-segment winding wound outside the first core leg is not connected to the tail end of the three-segment winding wound outside the second core leg, the second secondary winding connects the first core leg and the second core leg, and at this time, the output voltage of the primary winding, the first secondary winding, and the second secondary winding is half of the output voltage when the two core legs are in the series connection state.

In an embodiment of the present invention, the connection mode of the second iron leg short circuit is:

the head end of the first section of winding outside the second core limb is connected with the tail end of the ninth section of winding through a copper bar, the head end of the second section of winding is connected with the tail end of the seventh section of winding through a copper bar, and the head end of the third section of winding is connected with the tail end of the eighth section of winding through a copper bar.

Compared with the prior art, the technical scheme of the utility model have following advantage:

impedance transformer such as single-phase three windings, including first iron leg, second iron leg and primary, first secondary, second secondary, primary, first secondary, two post coilings are all divided to primary, first secondary, second secondary, every post divides three-section winding, the interval of three-section winding equals, and the number of turns of every section winding is the same, the electromagnetic wire cross-sectional area that uses equals, makes primary first secondary the resistance of second secondary, inductance, capacitance reactance equal. The utility model discloses a primary winding, first secondary winding, the resistance of second secondary winding, inductive reactance, appearance reactance of transformer equal, transformer impedance equals promptly. The utility model is mainly applied to the precision equipment which has higher requirement on proportional distribution deviation of voltage and rated capacity and operates in parallel, when the impedance of the impedance transformer is equal, the impedance voltage divided by the impedance is also equal, the voltage fluctuation of the two parallel-operation precision equipment connected with the equal-impedance transformer is equal, the voltage deviation is reduced, the voltage of the two parallel-operation precision equipment is equal, the parallel-operation efficiency is improved, the cost is reduced, and the electric energy resource of a power grid is saved.

Drawings

In order to make the content of the invention more clearly understood, the invention will now be described in further detail with reference to specific embodiments thereof, in conjunction with the accompanying drawings, in which

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is a schematic diagram of the winding arrangement of the present invention;

fig. 3 is a schematic diagram of a winding connection according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a winding connection provided in the second embodiment of the present invention;

fig. 5 is a front view of the copper bar shape structure of the single-phase three-winding equal impedance transformer provided by the present invention;

fig. 6 is a front view of the single-phase three-winding equal-impedance transformer without copper bar outline structure provided by the utility model;

fig. 7 is a right side view of the external structure of the impedance transformer with single-phase three windings and the like provided by the present invention;

fig. 8 is a top view of the external structure of the single-phase three-winding equal-impedance transformer provided by the present invention.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Example 1:

referring to fig. 1, a schematic diagram of the structure of the present invention is shown, where A1- (X1 ') X connected to a power supply is a primary winding, and A1- (X1 ') X1 and a2- (X2 ') X2 are a first secondary winding and a second secondary winding respectively connected to a load.

The single-phase three-winding equal-impedance transformer of the embodiment is a dry-type transformer with rated capacity of 30Kva, the working frequency is 30 Hz-200 Hz, ii0/Ii0 wiring combination is adopted, and the cooling mode is natural air cooling (AN).

Comprises an iron core column: a first core limb, a second core limb; a primary winding, a first secondary winding, and a second secondary winding.

In the primary winding, the first secondary winding and the second secondary winding of the single-phase three-winding equal-impedance transformer of the embodiment, the rated voltage is 100V, taps are led out at 50V, the rated current is 300A, the basic impedance voltage is 1.5% -2%, the impedance voltage deviation among the windings is less than or equal to 1%, the no-load current is 3%, the no-load loss is 300W, the insulation level of the transformer is designed according to 5kv/min, the insulation level is F level, and the working mode is long-term use.

Fig. 2 shows the winding arrangement and connection method of the present embodiment:

primary winding: the winding device is used for connecting a power supply and winding in two columns, and each column is divided into three sections of windings which comprise a first section of winding, a second section of winding and a third section of winding wound outside each iron core column;

a first secondary winding: the winding is used for connecting a load, is wound by two columns, and is divided into three sections of windings by each column, wherein each winding comprises a fourth section of winding, a fifth section of winding and a sixth section of winding which are wound outside each core column;

a second secondary winding: the winding is used for connecting a load, is wound by two columns, and is divided into three sections of windings by each column, wherein the seventh section of winding, the eighth section of winding and the ninth section of winding are wound outside each iron core column;

the primary winding, the first secondary winding and the second secondary winding are mutually insulated, and the number of turns is 18;

the distances among three sections of windings of the primary winding, the first secondary winding and the second secondary winding outside each iron core column are equal to 20mm, the number of turns of each section of winding is 3, and the cross-sectional areas of electromagnetic wires used are equal;

the head ends of the first section of winding outside the first iron core column and the first section of winding outside the second iron core column are both connected with a power supply, the head ends of the second section of winding and the third section of winding outside the first iron core column and the second section of winding and the third section of winding outside the second iron core column are both connected with a load, the tail end of the first section of winding outside the same iron core column is connected with the head end of the fifth section of winding through a copper bar, the tail end of the fifth section of winding is connected with the head end of the ninth section of winding through a copper bar, and the tail ends of the ninth section of winding outside the two iron core columns are connected through a copper bar; the tail end of the second section of winding outside the same iron leg is connected with the head end of the sixth section of winding through a copper bar, the tail end of the sixth section of winding is connected with the head end of the seventh section of winding through a copper bar, and the tail ends of the seventh section of winding outside the two iron legs are connected through a copper bar; and the tail end of the third section of winding outside the same iron core column is connected with the head end of the fourth section of winding through a copper bar, the tail end of the fourth section of winding is connected with the head end of the eighth section of winding through a copper bar, and the tail ends of the eighth section of winding outside the two iron core columns are connected through a copper bar.

The primary winding is sequentially provided with the first section of winding, the second section of winding and the third section of winding from inside to outside in a concentric structure outside each iron core column; the concentric structure of the first secondary winding outside each iron core limb is provided with a fourth section of winding, a fifth section of winding and a sixth section of winding from inside to outside in sequence; the second secondary winding is sequentially provided with the seventh winding section, the eighth winding section and the ninth winding section from inside to outside in a concentric structure outside each iron core column.

Taps of the primary winding, the first secondary winding and the second secondary winding are all connected with the no-load voltage regulating tap switch.

In the embodiment, the input voltages of the primary winding, the first secondary winding and the second secondary winding of the single-phase three-winding equiimpedance transformer are all equal to the rated voltage of 100V, the first core limb and the second core limb are in a series connection state, and the output voltages of the primary winding, the first secondary winding and the second secondary winding are equal to the rated voltage of 100V, as shown in fig. 3.

Referring to fig. 5, fig. 6, fig. 7, and fig. 8, there are respectively a front view, a right view, and a top view of the copper bar-containing external structure, the copper bar-free external structure, and the external structure of the single-phase three-winding equal-impedance transformer according to the present embodiment.

It is right the utility model provides an impedance transformer such as single-phase three-winding has carried out impedance test, no-load test, temperature rise test, insulating tolerance test and other routine tests, and its each item test data are shown as table 1 ~ table 5.

TABLE 1 Voltage ratio error not greater than. + -. 1%

Value of K	1	1	1	2
					Voltage ratio	100/100	100/100	100/100	100/50
Error of measurement	0.16	0.16	0.10	0.12

Table 2. Insulation test:

TABLE 3 Performance test with reference temperature of 100 deg.C

Table 4. Dc resistance: (23 ℃) units: m omega

Tapping position
					A1X1	1.257
	A2X2	1.232
					A3X3	1.223

Table 5: sound level test:

detecting data

53dB

As can be seen from tables 1 to 5, the parameters of the impedance transformer with single-phase three windings and the like provided by the utility model all meet the requirements.

The winding arrangement and connection mode adopted by the embodiment meet the equal impedance requirement of the transformer. The primary winding, the first secondary winding and the second secondary winding are equal in turn number, are wound by two columns, are uniformly divided into three sections of windings with equal distance and equal turn number on each column, and the cross sections of electromagnetic wires used by the three sections of windings are the same, so that the resistance, inductive reactance and capacitive reactance of the primary winding, the first secondary winding and the second secondary winding are the same, the impedance of the transformer is equal, in addition, the insulation distance between the three sections of windings is smaller, the size of the transformer winding can be reduced, the overall size of the whole transformer is reduced, and the manufacturing cost of the transformer is reduced.

The impedance transformer such as the single-phase three-winding transformer of this embodiment is dry-type transformer, does not have seepage and fire control problem, and fire behavior is good, and the loss is low, and the noise is low, and is pollution-free, and it is simple to maintain, and insulating properties is good, and the partial discharge volume is little, and lightning impulse resistance is strong, and dry-type transformer is small, light in weight, simple to operate. In the embodiment, taps of the primary winding, the first secondary winding and the second secondary winding are all connected with the no-load voltage regulating tap switch, and the gear can be manually regulated within a small range to change the transformation ratio of the transformer, so that the voltage on the output side of the transformer is stabilized as much as possible when the voltage of a power grid fluctuates.

Example 2:

based on the above embodiments, the present embodiment changes the output voltages of the primary winding, the first secondary winding, and the second secondary winding by changing the winding connection manner outside the core limb.

And when the tail end of the three-section winding wound outside the first iron core column of the second secondary winding is not correspondingly connected with the tail end of the three-section winding wound outside the second iron core column, the first iron core column is in a connection state, and the second iron core column is short-circuited at the same time:

placing the first iron leg core in a connection state: the head end of the first section of winding and the tail end of the ninth section of winding outside the first iron core column are connected with a power supply, the head end of the second section of winding, the head end of the third section of winding, the tail end of the seventh section of winding and the tail end of the eighth section of winding are all connected with a load, and the connection mode of other windings outside the first iron core column refers to the embodiment;

short-connecting a second iron core column: the head end of the first section of winding outside the second core limb is connected with the tail end of the ninth section of winding through a copper bar, the head end of the second section of winding is connected with the tail end of the seventh section of winding through a copper bar, the head end of the third section of winding is connected with the tail end of the eighth section of winding through a copper bar, and the connection mode of other windings outside the second core limb refers to the embodiment.

In this embodiment, the output voltage of the primary winding, the first secondary winding, and the second secondary winding is half of the output voltage in the state where the two core legs are connected in series, that is, 50V, as shown in fig. 4.

In the embodiment, the voltage of the primary winding, the first secondary winding and the second secondary winding is changed by changing the winding connection mode of the iron core column wound outside, the method is simple and convenient, the connection mode of the single-phase three-winding equal-impedance transformer can be adjusted according to different requirements, and the application range is expanded.

Example 3:

the utility model discloses an impedance transformer such as single-phase three windings still can regard as three-phase series reactor to use, based on above-mentioned embodiment 1 the winding arrange and connected mode, this embodiment provides a three-phase series reactor, include: the reactor comprises a first single-phase series reactor, a second single-phase series reactor and a third single-phase series reactor.

The head end of the first section of winding outside the first iron core column is connected with a power supply, the head end of the first section of winding outside the second iron core column is connected with a load, the tail end of the first section of winding outside the same iron core column is connected with the head end of the fifth section of winding through a copper bar, the tail end of the fifth section of winding is connected with the head end of the ninth section of winding through a copper bar, and the tail ends of the ninth section of winding outside the two iron core columns are connected through a copper bar to obtain a first single-phase series reactor;

the head end of the second section of winding outside the first core limb is connected with a power supply, the head end of the second section of winding outside the second core limb is connected with a load, the tail end of the second section of winding outside the same core limb is connected with the head end of the sixth section of winding through a copper bar, the tail end of the sixth section of winding is connected with the head end of the seventh section of winding through a copper bar, and the tail ends of the seventh section of winding outside the two core limbs are connected through a copper bar to obtain a second single-phase series reactor;

and the head end of the third winding outside the first core limb is connected with a power supply, the head end of the third winding outside the second core limb is connected with a load, the tail end of the third winding outside the same core limb is connected with the head end of the fourth winding through a copper bar, the tail end of the fourth winding is connected with the head end of the eighth winding through a copper bar, and the tail ends of the eighth windings outside the two core limbs are connected through a copper bar to obtain a third single-phase series reactor.

And the three phases of the first single-phase series reactor, the second single-phase series reactor and the third single-phase series reactor are balanced.

The three-phase series reactor can limit the value of short-circuit current, and can also be connected with a capacitor in series or in parallel in a filter to limit higher harmonics in a power grid.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A single-phase three-winding equiimpedance transformer is characterized in that it comprises,

iron core column: comprises a first iron core column and a second iron core column;

primary winding: the winding device is used for connecting a power supply and is wound in two columns, and each column is divided into three sections of windings which comprise a first section of winding, a second section of winding and a third section of winding wound outside each iron core column;

a first secondary winding: the winding is used for connecting a load, is wound by two columns, and is divided into three sections of windings by each column, wherein each winding comprises a fourth section of winding, a fifth section of winding and a sixth section of winding which are wound outside each core column;

a second secondary winding: the winding is used for connecting a load, is wound by two columns, and is divided into three sections of windings by each column, wherein the seventh section of winding, the eighth section of winding and the ninth section of winding are wound outside each iron core column;

the primary winding, the first secondary winding and the second secondary winding are mutually insulated and have the same number of turns;

the primary winding, the first secondary winding and the second secondary winding have the same space among three sections of windings outside each core limb, the number of turns of each section of winding is equal, and the cross-sectional areas of used electromagnetic wires are equal;

the tail end of the first section of winding wound outside the same iron core column is connected with the head end of the fifth section of winding through a copper bar, and the tail end of the fifth section of winding is connected with the head end of the ninth section of winding through the copper bar;

the tail end of the second section of winding wound outside the same iron core column is connected with the head end of the sixth section of winding through a copper bar, and the tail end of the sixth section of winding is connected with the head end of the seventh section of winding through the copper bar;

the tail end of the third section of winding wound outside the same iron core column is connected with the head end of the fourth section of winding through a copper bar, and the tail end of the fourth section of winding is connected with the head end of the eighth section of winding through the copper bar.

2. The single-phase three-winding equal-impedance transformer according to claim 1, wherein the primary winding, the first secondary winding and the second secondary winding are wound outside the two core legs in a concentric structure.

3. The single-phase three-winding equiimpedance transformer of claim 2,

the primary winding is sequentially provided with the first section of winding, the second section of winding and the third section of winding from inside to outside in a concentric structure outside each iron core column;

the concentric structure of the first secondary winding outside each iron core column is sequentially provided with the fourth section of winding, the fifth section of winding and the sixth section of winding from inside to outside;

the second secondary winding is sequentially provided with the seventh winding section, the eighth winding section and the ninth winding section from inside to outside in a concentric structure outside each iron core column.

4. The single-phase three-winding equal-impedance transformer according to claim 1, wherein the primary winding, the first secondary winding and the second secondary winding are isolated by using an insulating block.

5. The single-phase three-winding equal-impedance transformer according to claim 1, wherein taps of the primary winding, the first secondary winding and the second secondary winding are all connected with a no-load voltage regulating tap switch.

6. The single-phase three-winding equiimpedance transformer of claim 1, wherein the single-phase three-winding equiimpedance transformer is a dry transformer.

7. The single-phase three-winding equal-impedance transformer according to claim 1, wherein when the tail end of the three-segment winding wound around the first leg core of the second secondary winding is connected to the tail end of the three-segment winding wound around the second leg core, the first leg core and the second leg core are connected in series, and the output voltages of the primary winding, the first secondary winding and the second secondary winding are rated voltages.

8. The single-phase three-winding equiimpedance transformer of claim 7, wherein the connection manner of the second secondary winding between the tail end of the three-segment winding wound outside the first core limb and the tail end of the three-segment winding wound outside the second core limb is:

the tail end of the seventh winding section outside the first iron core column is connected with the tail end of the seventh winding section outside the second iron core column through a copper bar;

the tail end of the eighth winding outside the first iron core column is connected with the tail end of the eighth winding outside the second iron core column through a copper bar;

and the tail end of the ninth section of winding outside the first iron core column is connected with the tail end of the ninth section of winding outside the second iron core column through a copper bar.

9. The single-phase three-winding equiimpedance transformer of claim 7, wherein the second secondary winding connects the first leg when the tail end of the three-segment winding wound around the first leg is not connected to the tail end of the three-segment winding wound around the second leg, and short-circuits the second leg, and the output voltage of the primary winding, the first secondary winding, and the second secondary winding is half of the output voltage of the two legs in series.

10. The single-phase three-winding equiimpedance transformer of claim 9, wherein the second leg of core is short-circuited by:

the head end of the first section of winding outside the second core limb is connected with the tail end of the ninth section of winding through a copper bar, the head end of the second section of winding is connected with the tail end of the seventh section of winding through a copper bar, and the head end of the third section of winding is connected with the tail end of the eighth section of winding through a copper bar.

Images