CN116092800A - A backup phase transformer adapted to multiple transformers - Google Patents

Abstract

The invention belongs to the field of standby phase transformers, and particularly discloses a standby phase transformer adapting to a plurality of transformers, which comprises the following components: a medium-voltage coil, a medium-voltage regulating coil, a high-voltage reactor and a high-voltage coil which are sequentially connected in series; the high-voltage coil is provided with a plurality of high-voltage tapping points, and the high-voltage tapping points are electrically connected with adjustable high-voltage through different two high-voltage tapping points; the high-voltage reactor is provided with a plurality of high-voltage impedance tapping points used for being connected with the medium-voltage regulating coil, and the medium-voltage regulating coil is electrically connected with different high-voltage impedance tapping points to regulate high-voltage impedance. The transformer is convenient to regulate voltage, the high-medium running impedance is continuously adjustable, the impedance of other transformers can be well matched, the impedance deviation can be controlled to be within +/-2%, the parallel running requirement is met, the transformers with the same capacity can be quickly replaced, the transformer has very strong universality and interchangeability, the influence of transformer faults on the life of people is reduced, and the influence on industrial production and huge economic loss are reduced.

Description

A backup phase transformer adapting to multiple transformers

technical field

The invention belongs to the technical field of backup phase transformers, and in particular relates to a backup phase transformer adapted to multiple transformers.

Background technique

At present, the high-voltage rated voltage of 500kV power transformers in my country's power transmission and transformation system is between 500-525kV, most of the medium-voltage rated voltage is 230kV, the medium-voltage voltage regulation range is ±2×2.5%, and the high-medium rated tap impedance Between 12% and 24%, there are many voltage types and large impedance ranges, so the main transformers in different substations generally have some differences in voltage and impedance.

At present, 500kV substations are rarely equipped with spare transformers. Once a transformer fails, the entire transformer group will stop working, and power transmission can only be resumed after the completion of repairs or the completion of a transformer rebuilt according to the parameters of the faulty transformer. It also has a great impact on industrial production. impact, resulting in huge economic losses. Since transformers of the same capacity require the same voltage and same impedance when running in parallel, it is currently difficult to exchange main transformers in different substations due to differences in voltage and impedance. In order to enable the transformer to be used as a backup phase of transformers with different voltages and different impedances, it is an urgent problem to develop a backup phase transformer that can adjust the voltage and impedance values at the same time to adapt to multiple transformers.

Contents of the invention

The invention provides a backup phase transformer adapted to multiple transformers, which is used to solve the problem of low adaptability of voltage and impedance fixation of the current backup phase transformer.

In order to solve the above technical problems, the technical solution of the present invention is: the backup phase transformer adapted to multiple transformers, which includes: a medium-voltage coil, a mid-voltage coil, a high-voltage reactor and a high-voltage coil connected in series; The high-voltage coil is provided with a plurality of high-voltage tap points, and the high-voltage voltage can be adjusted by electrically connecting two different high-voltage tap points;

The high-voltage reactor is provided with a plurality of high-voltage impedance taps for connecting the mid-tuning coil, and the mid-tuning coil is electrically connected to different high-voltage impedance taps to adjust the high-voltage impedance.

In a preferred embodiment of the present invention, it also includes a low-voltage coil, a low-voltage reactor and a low-voltage bushing connected in series in sequence. The low-voltage reactor is provided with at least three low-voltage tap points for connecting the low-voltage bushing. The low-voltage impedance can be adjusted by connecting different low-voltage taps.

In a preferred embodiment of the present invention, one end of the low-voltage coil is connected to the low-voltage bushing, and the other end of the low-voltage coil is electrically connected to the low-voltage reactor.

In a preferred embodiment of the present invention, the low-voltage reactor has m-1 tap sections and m tap points, and m is determined according to the transformer medium-low operating impedance adjustment range and impedance deviation range.

In a preferred embodiment of the present invention, when the low-voltage reactor works at the tap point m, the middle-low operating impedance of the transformer is the smallest, and when the low-voltage reactor works at the tap point 1, the middle-low operating impedance of the transformer is the largest.

In a preferred embodiment of the present invention, the mid-tuning coil includes a first outlet terminal connected to the high-voltage reactor, a terminal outlet terminal electrically connected to the first outlet terminal of the medium-voltage coil, and a terminal for connecting with the medium-voltage sleeve A plurality of voltage regulating tap points connected to the tubes can adjust the medium voltage voltage by connecting different voltage regulating tap points through the medium voltage bushing, and the outlet end of the medium voltage coil is connected to the neutral point bushing.

In a preferred embodiment of the present invention, the high-voltage coil is a middle-inlet type, including an upper high-voltage coil and a lower high-voltage coil connected in parallel. Both the upper high-voltage coil and the lower high-voltage coil are provided with high-voltage tap points, and the upper high-voltage coil interruption point The two tap points on both sides are bridge connected, and the two tap points on both sides of the interruption point of the lower high voltage coil are bridge connected. When the transformer is running, the upper high voltage coil and the lower high voltage coil are bridged at the same tap point. The number of turns of the high voltage coil to regulate the high voltage.

In a preferred embodiment of the present invention, the terminal outlet of the upper high-voltage coil and the terminal outlet of the lower high-voltage coil are electrically connected to the current input terminal of the high-voltage reactor, and the first terminal of the upper high-voltage coil, The head outlet of the lower high-voltage coil is electrically connected to the high-voltage bushing.

In a preferred embodiment of the present invention, the high-voltage coil is a middle-inlet type, including an upper high-voltage coil and a lower high-voltage coil connected in parallel; an upper high-voltage coil is arranged outside the upper high-voltage coil, and is arranged at the tap point of the upper high-voltage coil is the upper high-voltage tap point; the lower high-voltage coil is provided with a lower high-voltage coil, and the tap point set on the lower high-voltage coil is the lower high-voltage tap point; one upper high-voltage tap point, one lower high-voltage tap point and the current input terminal of the high-voltage reactor Electrical connection, by changing the connection tap point to change the number of turns of the connected high-voltage coil to adjust the high-voltage voltage.

In a preferred embodiment of the present invention, the terminal outlet of the upper high-voltage coil is electrically connected to the first outlet of the upper high-profile coil, and the terminal outlet of the lower high-voltage coil is electrically connected to the first outlet of the lower high-profile coil. A tap point on the upper high-frequency coil and a tap point on the lower high-frequency coil are electrically connected to the current input end of the high voltage reactor.

In a preferred embodiment of the present invention, the upper high-voltage tap points are sequentially numbered from the end outlet end near the high-voltage coil to the first outlet end of the high-voltage coil, and the lower high-voltage tap points are numbered from the end outlet end near the lower high-voltage coil. Increment the number in the direction close to the first outlet of the lower high-voltage coil, electrically connect an upper high-voltage tap point to the lower high-voltage tap point with the same number, and adjust the connected upper high-voltage tap point incrementally, and the high-voltage voltage decreases gradually.

In a preferred embodiment of the present invention, the high voltage reactor has n-1 tap sections and n tap points, and n is determined according to the transformer high-medium operating impedance adjustment range and impedance deviation range.

In a preferred embodiment of the present invention, when the high-voltage reactor works at tap point n, the transformer high-middle operating impedance is the smallest, and when the high-voltage reactor works at tap point 1, the transformer high-middle operating impedance is the largest.

In a preferred embodiment of the present invention, the coil type of the high voltage reactor is a continuous type, and the inner diameter and outer diameter of each coil of the high voltage reactor are the same, and the number of turns and reactance height are different. The number of coil turns and reactance height are configured by formula 1 Realize that the inductance and inductance of each stage are the same:

Among them, L is the inductance, k is the coefficient, N is the number of turns of the coil, r is the average radius of the reactor coil, H is the reactance height of the reactor, and W is the amplitude of the reactor coil.

Compared with the prior art, the technical solution provided by the invention has the following advantages:

The 500kV transformer of the present invention can provide high-voltage voltages of 500kV, 505kV, 510kV, 515kV, 520kV, and 525kV, a total of 6 voltages, and the voltage regulation method is simple and convenient, and the high-medium operating impedance is continuously adjustable, which can be completely applicable to the current 500kV transmission transformer electrical system needs. At the same time, it can be well matched with the impedance of other transformers, and the impedance deviation can be controlled within ±2%, which meets the requirements of parallel operation and can quickly replace transformers with the same capacity, and has very strong versatility and interchangeability. In other abnormal situations such as failure of other transformers with the same capacity, they can be replaced directly to achieve rapid restoration of power supply, reduce the impact of transformer failure on people's lives, reduce the impact on industrial production and huge economic losses.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain the drawings of other embodiments according to these drawings without creative work.

Fig. 1 is a wiring schematic diagram of a backup phase transformer adapted to multiple transformers described in an embodiment of the present invention;

Fig. 2 is a wiring schematic diagram of a tap changer of a backup phase transformer adapted to multiple transformers described in an embodiment of the present invention;

Fig. 3 is a schematic diagram of wiring of a backup phase transformer adapted to multiple transformers according to another embodiment of the present invention.

Detailed ways

For ease of understanding, a backup phase transformer adapted to multiple transformers is described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation and positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplification of the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific orientation construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

As shown in Figure 1, a backup phase transformer adapted to multiple transformers in the present invention includes a low-voltage coil, a low-voltage reactor, an intermediate adjustment coil, a medium-voltage coil, a high-voltage coil, and a high-voltage reactor

A spare phase transformer adapted to multiple transformers, including: a low-voltage coil, a low-voltage reactor and a low-voltage bushing connected in series in sequence, a medium-voltage coil, an intermediate adjustment coil, a high-voltage reactor and a high-voltage coil connected in series in sequence; A plurality of high-voltage tap points are provided, and the high-voltage voltage can be adjusted by electrically connecting two different high-voltage tap points.

The low-voltage reactor is provided with at least three low-voltage tap points for connecting low-voltage bushings, and the low-voltage impedance can be adjusted by connecting different low-voltage tap points through the low-voltage bushings.

One end of the low-voltage coil is connected to the low-voltage bushing, and the other end of the low-voltage coil is electrically connected to the low-voltage reactor.

The low-voltage reactor has m-1 tap sections and m tap points, and m is determined according to the transformer's medium-low operating impedance adjustment range and impedance deviation range. When the low-voltage reactor works at the tap point m, the middle-low operating impedance of the transformer is the smallest, and when the low-voltage reactor works at the tap point 1, the middle-low operating impedance of the transformer is the largest.

The middle adjustment coil includes the first outlet connected to the high voltage reactor, the last outlet electrically connected to the first outlet of the medium voltage coil, and multiple voltage regulating taps for connecting with the medium voltage bushing. The medium-voltage bushing is connected to different voltage-regulating tap points to adjust the medium-voltage voltage, and the terminal outlet of the medium-voltage coil is connected to the neutral point bushing.

The high-voltage reactor is provided with a plurality of high-voltage impedance tap points for connecting the mid-tuning coil, and the high-voltage impedance can be adjusted by electrically connecting different high-voltage impedance tap points through the mid-tuning coil.

In one embodiment of the present invention, the high-voltage coil is a central wire-in type, including an upper high-voltage coil and a lower high-voltage coil connected in parallel. Both the upper high-voltage coil and the lower high-voltage coil are provided with high-voltage tap points, and the two sides of the upper high-voltage coil interruption point The two tap points on both sides of the interruption point of the lower high-voltage coil are bridge-connected. When the transformer is running, the upper high-voltage coil and the lower high-voltage coil are bridged at the same tap point, and the turns connected to the high-voltage coil are changed by changing the bridge tap point. number to adjust the high voltage.

The end outlet end of the upper high voltage coil and the end outlet end of the lower high voltage coil are electrically connected to the current input end of the high voltage reactor, the head end of the upper high voltage coil, the head outlet end of the lower high voltage coil and the high voltage bushing connect.

Referring to Figure 1, the high-voltage coil includes an upper high-voltage coil and a lower high-voltage coil connected in parallel. There are seven upper high-voltage tap points on the upper high-voltage coil. The upper high-voltage tap points are from the first outlet of the upper high-voltage coil to the last outlet The numbers are: 7, 5, 3, 2, 4, 6, and 8. The lower high-voltage coil is provided with seven lower high-voltage tap points, and the lower high-voltage tap points are numbered 7, 5, 3, 2, 4, 6, and 8 from the first outlet end to the last outlet end of the lower high-voltage coil. As shown in Figure 2, there are seven contacts on the tap changer, respectively numbered 2, 3, 4, 5, 6, 7, and 8, and the upper high-voltage tap point, lower high-voltage tap point and contact point of the same number electrical connection.

Referring to Figure 2, when the target voltage is 525kV, the tap changer is connected to the first tap level, which is the largest tap level, and the No. 2 contact and No. 3 contact are connected to the circuit;

When the target voltage is 520kV, the tap changer is connected to the second tap stage, and contacts No. 3 and No. 4 are connected to the circuit;

When the target voltage is 515kV, the tap changer is connected to the third tap stage, and the No. 4 contact and No. 5 contact are connected to the circuit;

When the target voltage is 510kV, the tap changer is connected to the fourth tap level, and the No. 5 contact and No. 6 contact are connected to the circuit;

When the target voltage is 505kV, the tap changer is connected to the fifth tap level, and the No. 6 contact and No. 7 contact are connected to the circuit;

When the target voltage is 500kV, the tap changer is connected to the sixth tap level, which is the smallest tap level, and the No. 7 contact and No. 8 contact are connected to the circuit.

The low voltage impedance and high voltage impedance adjust the tap point accordingly according to the target impedance value.

The high-voltage reactor has n-1 tap sections and n tap points, and n is determined according to the transformer high-medium operating impedance adjustment range and impedance deviation range. When the high-voltage reactor works at the tap point n, the high-middle operating impedance of the transformer is the smallest, and when the high-voltage reactor works at the tap point 1, the transformer high-middle operating impedance is the largest.

The coil type of the high voltage reactor is continuous type. The inner diameter and outer diameter of each stage of the high voltage reactor coil are the same, and the number of turns and reactance height are different. The inductance and inductance of each stage are the same by configuring the number of coil turns and reactance height through formula 1:

Among them, L is the inductance, k is the coefficient, N is the number of turns of the coil, r is the average radius of the reactor coil, H is the reactance height of the reactor, and W is the amplitude of the reactor coil.

In another embodiment of the present invention, the high-voltage coil is a middle-inlet type, including a parallel upper high-voltage coil and a lower high-voltage coil; The lower high-voltage coil is set outside the lower high-voltage coil, and the tap point set on the lower high-voltage coil is the lower high-voltage tap point; one upper high-voltage tap point and one lower high-voltage tap point are electrically connected to the current input terminal of the high-voltage reactor. By changing the connection The tap point changes the number of turns of the connected high-voltage coil to adjust the high-voltage voltage.

The terminal outlet of the upper high-voltage coil is electrically connected to the first outlet of the upper high-profile coil, and the terminal outlet of the lower high-voltage coil is electrically connected to the first outlet of the lower high-profile coil. A tap point on the upper high-frequency coil and a tap point on the lower high-frequency coil are electrically connected to the current input end of the high voltage reactor.

The upper high-voltage tap points are sequentially numbered from the end outlet near the high-voltage coil to the first outlet near the high-voltage coil, and the lower high-voltage taps are numbered from the end outlet near the lower high-voltage coil to the first outlet near the lower high-voltage coil The terminal direction is numbered sequentially, and an upper high-voltage tap is electrically connected to a lower high-voltage tap with the same number. When the connected upper high-voltage tap is adjusted incrementally, the high-voltage voltage decreases.

As shown in Figure 3, the upper high-voltage coil has six upper high-voltage tap points, and the upper high-voltage tap points are numbered 1, 2, 3, 4, 5, 6. The lower high-voltage coil has six lower high-voltage tap points. The lower high-voltage tap points are numbered 1, 2, 3, 4, 5, and 6 from the end outlet end far away from the lower high-voltage coil to the end outlet end close to the lower high-voltage coil. Number. According to the target voltage, electrically connect the upper high-voltage tap point and the lower high-voltage tap point of the same number.

When the target voltage is 525kV, connect the No. 1 upper high-voltage tap point and No. 1 lower high-voltage tap point to the current input terminal of the high-voltage reactor;

When the target voltage is 520kV, connect the No. 2 upper high-voltage tap point and No. 2 lower high-voltage tap point to the current input terminal of the high-voltage reactor;

When the target voltage is 515kV, connect the No. 3 upper high-voltage tap point and No. 3 lower high-voltage tap point to the current input terminal of the high-voltage reactor;

When the target voltage is 510kV, connect the No. 4 upper high-voltage tap point and No. 4 lower high-voltage tap point to the current input terminal of the high-voltage reactor;

When the target voltage is 505kV, connect the No. 5 upper high voltage tap point and No. 5 lower high voltage tap point to the current input terminal of the high voltage reactor;

When the target voltage is 500kV, the No. 6 upper high voltage tap point and No. 6 lower high voltage tap point are electrically connected to the current input end of the high voltage reactor.

Other settings and adjustment methods are the same as the previous embodiment.

The 500kV transformer of the present invention can provide high-voltage voltages of 500kV, 505kV, 510kV, 515kV, 520kV, and 525kV, a total of 6 voltages, and the voltage regulation method is simple and convenient, and the high-medium operating impedance is continuously adjustable, which can be completely applicable to the current 500kV transmission transformer electrical system needs. At the same time, it can be well matched with the impedance of other transformers, and the impedance deviation can be controlled within ±2%, which meets the requirements of parallel operation and can quickly replace transformers with the same capacity, and has very strong versatility and interchangeability. When other abnormal conditions such as failure of other transformers with the same capacity occur, they can be replaced directly to achieve rapid restoration of power supply, reduce the impact of transformer failure on people's lives, and reduce the impact on industrial production and huge economic losses.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it can still modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some or all of the technical features, and These modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (14)

1. A backup phase transformer adapted to multiple transformers, characterized in that it comprises: A medium-voltage coil, a mid-voltage coil, a high-voltage reactor, and a high-voltage coil are connected in series in sequence; the high-voltage coil is provided with a plurality of high-voltage tap points, and the high-voltage voltage can be adjusted by electrically connecting two different high-voltage tap points; The high-voltage reactor is provided with a plurality of high-voltage impedance taps for connecting the mid-tuning coil, and the mid-tuning coil is electrically connected to different high-voltage impedance taps to adjust the high-voltage impedance. 2. A backup phase transformer adapted to multiple transformers according to claim 1, characterized in that: it also includes a low-voltage coil, a low-voltage reactor and a low-voltage bushing connected in series in sequence, and the low-voltage reactor is provided with at least three There are two low-voltage tap points for connecting low-voltage bushings, and the low-voltage impedance can be adjusted by connecting different low-voltage tap points through low-voltage bushings. 3. A backup phase transformer adapted to multiple transformers according to claim 2, characterized in that: one end of the low-voltage coil is connected to a low-voltage bushing, and the other end of the low-voltage coil is electrically connected to a low-voltage reactor. 4. A backup phase transformer adapted to multiple transformers according to claim 2, characterized in that: said low-voltage reactor has m-1 tap sections, m tap points, and m is based on the transformer middle-low The operating impedance adjustment range and impedance deviation range are determined. 5. A backup phase transformer adapted to multiple transformers according to claim 2, characterized in that: when the low-voltage reactor works at the tap point m, the medium-low operating impedance of the transformer is the smallest, and the low-voltage reactor works at At tap point 1, the transformer has the largest mid-low operating impedance. 6. A backup phase transformer adapted to multiple transformers according to claim 1, characterized in that: said mid-adjustment coil includes a first outlet connected to a high-voltage reactor, and a first outlet connected to a medium-voltage coil The outlet end of the terminal electrical connection, and a plurality of voltage regulating tap points for connecting with the medium voltage bushing, the medium voltage voltage can be adjusted by connecting different voltage regulating tap points through the medium voltage bushing, the medium voltage coil The terminal outlet end is connected with the neutral point bushing. 7. A spare phase transformer adapted to multiple transformers according to claim 1, characterized in that: the high-voltage coil is a middle-inlet type, including an upper high-voltage coil and a lower high-voltage coil connected in parallel, an upper high-voltage coil and a lower high-voltage coil. The lower high-voltage coils are equipped with high-voltage tap points. The two tap points on both sides of the interruption point of the upper high-voltage coil are bridge-connected, and the two tap points on both sides of the interruption point of the lower high-voltage coil are bridge-connected. The coils are bridged at the same tap point, and the high-voltage voltage can be adjusted by changing the number of turns connected to the high-voltage coil by changing the bridge tap point. 8. A spare phase transformer adapted to multiple transformers according to claim 7, characterized in that: the terminal outlet terminal of the upper high voltage coil, the terminal outlet terminal of the lower high voltage coil and the current of the high voltage reactor The input end is electrically connected, and the first wire end of the upper high voltage coil, the first outlet end of the lower high voltage coil are electrically connected with the high voltage bushing. 9. A spare-phase transformer regulating system adapting to multiple transformers according to claim 1, characterized in that: the high-voltage coil is a central incoming line type, including parallel-connected upper high-voltage coils and lower high-voltage coils; An upper high-profile coil is arranged outside the upper high-voltage coil, and the tap point arranged on the upper high-profile coil is an upper high-voltage tap point; the lower high-voltage coil is provided with a lower high-profile coil, and the tap point arranged on the lower high-profile coil is a lower high-voltage tap point; An upper high-voltage tap point and a lower high-voltage tap point are electrically connected to the current input terminal of the high-voltage reactor, and the high-voltage voltage is adjusted by changing the number of turns of the connected high-voltage coil by changing the connection tap point. 10. A spare phase transformer adapted to multiple transformers according to claim 9, characterized in that: the terminal outlet of the upper high-voltage coil is electrically connected to the first outlet of the upper high-voltage coil, and the lower high-voltage coil The end outlet of the lower high-profile coil is electrically connected to the first outlet of the lower high-profile coil; one tap point on the upper high-profile coil, one tap point on the lower high-profile coil are electrically connected to the current input end of the high-voltage reactor. 11. A backup phase transformer adaptable to multiple transformers according to claim 10, characterized in that: the upper high voltage tap points are successively increased from the end outlet terminal close to the high voltage coil to the first outlet terminal close to the high voltage coil Numbering, the lower high-voltage tap points are numbered sequentially from the end outlet near the lower high-voltage coil to the first outlet near the lower high-voltage coil, and an upper high-voltage tap is electrically connected to the lower high-voltage tap with the same number. When the upper high-voltage tap point is adjusted incrementally, the high-voltage voltage decreases gradually. 12. A backup phase transformer adapted to multiple transformers according to claim 1, characterized in that: said high voltage reactor has n-1 tap sections and n tap points, n according to the transformer high-middle The operating impedance adjustment range and impedance deviation range are determined. 13. A spare phase transformer adapted to multiple transformers according to claim 1, characterized in that: when the high-voltage reactor works at tap point n, the high-middle operating impedance of the transformer is the smallest, and the high-voltage reactor works at At tap point 1, transformer high-medium operating impedance is maximum. 14. A spare phase transformer adapted to multiple transformers according to claim 1, characterized in that: the coil type of the high-voltage reactor is continuous, and the inner diameter and outer diameter of each stage of the high-voltage reactor coil are the same, and the turns The number and reactance height are different, and the inductance and inductive reactance of each stage are the same by configuring the number of coil turns and reactance height in formula 1:

Among them, L is the inductance, k is the coefficient, N is the number of turns of the coil, r is the average radius of the reactor coil, H is the reactance height of the reactor, and W is the amplitude of the reactor coil.

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