CN115910576A - Voltage-regulating phase-shifting rectifier transformer - Google Patents
Voltage-regulating phase-shifting rectifier transformer Download PDFInfo
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Abstract
The invention relates to the technical field of rectifier transformers, and discloses a voltage-regulating phase-shifting rectifier transformer, which comprises a rectifier main transformer, a voltage-regulating transformer and a series transformer; the rectifier main transformer comprises a first main transformer high-voltage basic winding, a first phase-shifting winding, a first main transformer low-voltage winding, a second main transformer high-voltage basic winding, a second phase-shifting winding and a second main transformer low-voltage winding; the series transformer comprises a first series of high-voltage basic windings and a first series of low-voltage windings, and a second series of high-voltage basic windings and a second series of low-voltage windings; the valve side low-voltage star-connection 8-shaped winding and the angle-connection 8-shaped winding are formed by respectively connecting a first main transformer low-voltage winding and a first series low-voltage winding in series; the voltage regulating transformer comprises a basic winding, a third phase-shifting winding, a coarse regulating winding and a fine regulating winding. The scheme can solve the problem that in the prior art, a double 8-word body structure with 12 equivalent pulse waves of a single unit can only be realized by adopting a specific scheme or adding a balance transformer.
Description
Technical Field
The invention relates to the technical field of rectifier transformers, in particular to a voltage-regulating phase-shifting rectifier transformer.
Background
The rectifier transformer is a power transformer of the rectifying device. The rectifier device is characterized in that the primary side inputs current, and the secondary side outputs direct current after passing through the rectifier element.
The structure of the rectifier transformer generally comprises a single-unit 6-pulse-wave rectifier circuit and a single-unit 12-pulse-wave rectifier circuit, wherein the single-unit 6-pulse-wave rectifier circuit can generate larger 5-order and 7-order harmonic currents on the network side in the operation process, and although the single-unit 12-pulse-wave rectifier circuit structure can greatly improve the 5-order and 7-order harmonic currents on the network side in the operation process, because two valve side windings of a valve side low-voltage star-connection winding and a valve side low-voltage angle-connection winding of the rectifier transformer share a primary winding and an iron core, the balance and the symmetry of the output voltage and the impedance of the two valve side windings of the valve side low-voltage star-connection winding and the valve side low-voltage angle-connection winding are difficult to be consistent, the requirement of engineering precision cannot be met, and the problem of serious uneven load distribution exists in the operation process.
In order to solve the problem corresponding to the single-unit 12-pulse rectification circuit structure, the existing single-unit equivalent 12-pulse rectification circuit structure is generally adopted, wherein the single-unit equivalent 12-pulse double 8-word body structure rectification circuit cannot be realized all the time due to technical problems and the like, and generally only the single 8-word body structure is adopted, namely if the single-unit equivalent 12-pulse rectification circuit is adopted in the actual engineering technology without balancing, the double 8-word body structure cannot be realized, and the single-unit equivalent 12-pulse double 8-word body structure can only be realized by taking a specific scheme or adding a balancing variable.
Disclosure of Invention
The invention aims to provide a voltage-regulating phase-shifting rectifier transformer which can solve the problem that in the prior art, a double 8-word structure with 12 equivalent pulse waves of a single unit can be realized only by adopting a specific scheme or adding a balance transformer.
In order to achieve the purpose, the invention adopts the following technical scheme: a voltage-regulating phase-shifting rectifier transformer comprises a rectifier main transformer, a voltage-regulating transformer and a series transformer, wherein the voltage-regulating transformer is arranged separately from the rectifier main transformer;
the rectifying main transformer comprises a first main transformer high-voltage basic winding, a first phase-shifting winding, a first main transformer low-voltage winding, a second main transformer high-voltage basic winding, a second phase-shifting winding and a second main transformer low-voltage winding;
the series transformer comprises a first series of high-voltage basic windings and a first series of low-voltage windings, and a second series of high-voltage basic windings and a second series of low-voltage windings;
the first main transformer low-voltage winding and the first series low-voltage winding are connected in series respectively to form a valve side low-voltage star-connected 8-shaped winding and an angle-connected 8-shaped winding; the main rectifier transformer and the series transformer are respectively combined together through a valve side low-voltage star connection 8-shaped winding and an angle connection 8-shaped winding structure to form a double 8-shaped winding main and series transformer body combined structure;
the regulating transformer comprises a basic winding, a third phase-shifting winding, a coarse regulating winding, a fine regulating winding and a compensating winding;
the coarse regulating winding and the fine regulating winding realize multi-stage coarse and fine continuous voltage regulation through a coarse and fine regulating on-load voltage regulating switch; the coarse adjusting winding and the fine adjusting winding form an adjusting output side to supply power to the first series of high-voltage basic windings and the second series of high-voltage basic windings in an exciting mode.
The principle and the advantages of the scheme are as follows: in the scheme, firstly, the rectifying main transformer and the regulating transformer are separately arranged, wherein the rectifying main transformer is composed of a first main transformer high-voltage basic winding, a first phase-shifting winding, a first main transformer low-voltage winding, a second main transformer high-voltage basic winding, a second phase-shifting winding and a second main transformer low-voltage winding, so that a single-unit equivalent 12-pulse rectification circuit is formed.
The series transformer comprises a first series of high-voltage basic windings and a first series of low-voltage windings, and a second series of high-voltage basic windings and a second series of low-voltage windings; the second main transformer low-voltage winding and the second series low-voltage winding are respectively connected in series to form a valve side low-voltage star-connected 8-shaped winding and an angle-connected 8-shaped winding; namely, the main transformer part of the valve side low-voltage star connection 8-shaped winding is a first main transformer low-voltage winding, and the serial transformer part of the valve side low-voltage star connection 8-shaped winding is a first serial low-voltage winding; similarly, the main transformer part of the angle connection 8-shaped winding is a second main transformer low-voltage winding, and the serial transformer part of the angle connection 8-shaped winding is a second serial low-voltage winding. Therefore, the rectifier main transformer and the series transformer are respectively combined together through a valve side low-voltage star connection '8' -shaped winding and an angle connection '8' -shaped winding structure to form a double 8-shaped winding main and series transformer body combined structure, so that a rectifier transformer body with a single unit equivalent 12-pulse lower double 8-shaped body structure is realized, in order to solve the problem that in the prior art, only a specific scheme can be adopted or a balance transformation is added to realize the double 8-shaped body structure with the equivalent 12-pulse of the single unit, the problem that the balance and the symmetry of the output voltage and the impedance of two valve side windings of a valve side low-voltage star connection winding and a valve side low-voltage angle connection winding under the rectifier circuit structure under the double 8-shaped body structure are difficult to be consistent is solved, the output corresponding to the valve side low-voltage star connection winding and the valve side low-voltage angle connection winding is subjected to voltage regulation through a voltage regulating transformer, specifically, the windings of the voltage regulating side transformer are sleeved on a magnetic circuit together, and the iron core magnetic circuit is sequentially from inside to outside: the series (or basic) compensation winding, the coarse adjustment winding, the basic winding, the third phase-shifting winding and the fine adjustment winding form a modulation output side for exciting and supplying power to the first series high-voltage basic winding and the second series high-voltage basic winding through the coarse adjustment winding and the fine adjustment winding, and the coarse adjustment winding and the fine adjustment winding realize multi-stage coarse and fine continuous voltage regulation through a coarse and fine adjustment on-load voltage regulation switch, so that the current of output ends corresponding to the valve side low-voltage star connection 8-shaped winding and the valve side angle connection 8-shaped winding is adjusted, and the current balance output of 12 phases on the valve side is realized.
1. According to the scheme, the rectifier main transformer and the series transformer are combined together to form a double 8-shaped winding main and series transformer body combined structure through a valve side low-voltage star connection 8-shaped winding and an angle connection 8-shaped winding structure respectively in a mode of connecting 8-shaped windings in series, so that a single unit set equivalent 12-pulse double 8-shaped transformer body structure is realized, and the voltage regulating transformers are separately arranged, so that the excitation power supply of the coarse regulating winding and the fine regulating winding to the first series low-voltage winding and the second series low-voltage winding is realized to regulate the current of the output ends corresponding to the valve side low-voltage star connection 8-shaped winding and the valve side low-voltage angle connection 8-shaped winding, so that the valve side 12-phase current balance output is realized, the problem that in the prior art, a specific scheme can be adopted or the balance transformation can be realized only, the problem that the valve side low-voltage star connection winding and the valve side low-voltage angle connection winding and the impedance of the two single unit set equivalent 12-pulse double 8-shaped transformer body structures are difficult to be consistent under any condition is solved.
2. The main rectifier transformer and the regulating transformer are arranged separately, and after a winding corresponding to voltage regulation is separated from the main transformer, the radial size and the structural capacity of a main transformer body can be reduced, so that the problems of transportation overrun and overall hoisting overweight of a high-capacity and ultrahigh-voltage main rectifier transformer are solved; after the main transformer is separated, the average turn length of the main transformer outer coil, particularly the main transformer low-voltage coil, can be reduced, and the consumable of the main transformer outer coil is reduced under the same condition; the winding lead wire of the voltage regulation after being separated from the main transformer and the valve side low-voltage lead wire are separated and do not interfere with each other, so that 1 three-phase switch or 3 single-phase on-load switches can be selected, namely, the number of the corresponding single-phase on-load switches is small, the cost is low, the size is small, and the limitation that a third winding voltage regulation mode can only adopt three single-phase on-load switches is broken through.
3. The coarse regulating winding and the fine regulating winding realize multi-stage coarse and fine continuous voltage regulation through the coarse and fine regulating on-load voltage regulating switch.
Preferably, as an improvement, the coarse tuning winding comprises a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil and a fifth coarse tuning coil which are connected in series in sequence;
the coarse and fine adjustment on-load voltage regulation switch comprises a first moving contact, a second moving contact and a plurality of static contacts;
the static contact is arranged on two sides of the first coarse tuning coil, the second coarse tuning coil, the third coarse tuning coil, the fourth coarse tuning coil and the fifth coarse tuning coil; the fixed contact is also arranged on a plurality of outlet ends of the fine tuning winding;
the outlet of the lower end part of the fine adjustment winding is also connected with a first moving contact; the first moving contact is used for being connected with a fixed contact on the coarse tuning coil; the first moving contact moves on a static contact of the coarse tuning coil to select a corresponding coarse tuning tapping position; the second moving contact is arranged on the static contact of the fine adjustment winding and is used for being connected with the static contact of the fine adjustment winding, and the second moving contact moves on the static contact of the fine adjustment winding to select a corresponding fine adjustment tapping position; and the second moving contact is respectively connected with the first high-voltage basic winding and the second high-voltage basic winding.
Has the advantages that: in the scheme, the fixed contacts are arranged on the fine adjustment winding and the coarse adjustment winding, specifically, the fixed contacts are arranged on two sides of each coarse adjustment coil of the coarse adjustment winding, the fixed contacts are arranged at a plurality of outlet ends of the fine adjustment winding, the first movable contact is arranged on the fine adjustment winding and is used for being connected with the fixed contact on the coarse adjustment winding to realize the dynamic adjustment of the first movable contact on the coil of the coarse adjustment winding, so that the coarse adjustment on the number of the coils of the coarse adjustment winding is realized, and similarly, the second movable contact is used for being connected with the fixed contact on the fine adjustment winding to realize the dynamic adjustment of the second movable contact on the fine adjustment winding, therefore, the fine adjustment function is realized, the accurate and quick voltage adjustment of the voltage-adjusting transformer is realized through the setting of the coarse adjustment and the fine adjustment functions, namely, the corresponding fine adjustment tapping position is selected through the back and forth movement of the second moving contact of the coarse and fine adjustment on-load voltage-regulating switch on each fine adjustment coil end, the static contact of the coarse and fine adjustment on-load voltage-regulating switch is always fixed, and the first moving contact of the coarse and fine adjustment on-load voltage-regulating switch can move at the upper position and the lower position of the static contact, so that the changes of the positive and negative serial connection directions of the coarse and fine adjustment windings are realized, and the function of live-line switching serial polarity is realized.
Preferably, as a refinement, the compensation winding includes a second coarse tuning coil and a basic compensation coil; one end of the basic compensation coil is connected in series between the first coarse tuning coil and the second coarse tuning coil, and a modulation output side and a compensation side shared neutral point are arranged between the second coarse tuning coil and the third coarse tuning coil; and the other end of the basic compensation coil is connected with a Y-connection compensation winding input end.
Has the advantages that: when the compensation winding is arranged, the Y connection of the compensation winding is realized through the connection between the second coarse tuning coil and the basic compensation coil, so that the whole transformer is more stable.
Preferably, as an improvement, the coarse tuning winding comprises an a-phase coarse tuning winding, a B-phase coarse tuning winding and a C-phase coarse tuning winding; the fine tuning winding comprises an A-phase fine tuning winding, a B-phase fine tuning winding and a C-phase fine tuning winding; the compensation winding comprises an A-phase compensation winding, a B-phase compensation winding and a C-phase compensation winding;
the A-phase compensation winding, the B-phase compensation winding and the C-phase compensation winding respectively comprise a fifth coarse tuning coil and a series compensation coil;
the A-phase coarse tuning winding, the B-phase coarse tuning winding and the C-phase coarse tuning winding respectively comprise a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil and a fifth coarse tuning coil which are sequentially connected in series;
the outlet of the lower end part of the series compensation coil of the phase B compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the phase A coarse tuning winding and led out of the input end A3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the C-phase compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the B-phase coarse tuning winding and led out of the input end B3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the A-phase compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the C-phase coarse tuning winding and led out of the input end C3 of the compensation winding.
Has the beneficial effects that: when the compensation winding is arranged, the scheme is that a section of coarse tuning winding which is idle in a high-voltage section and a low-voltage section and is operated in the high-voltage section and a series compensation winding are jointly used, so that the structural utilization rate of a corresponding coil is higher, the structure of the whole transformer is more material-saving, lower in cost and small in size, meanwhile, the electrified switching series polarity change is realized while the multi-stage on-load continuous voltage regulation is realized, and further, the D connection of the compensation winding is realized.
Drawings
Fig. 1 is a schematic diagram of a voltage-regulating phase-shifting rectifier transformer according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the connection of the coarse tuning winding and the fine tuning winding according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the connection of the voltage-regulating phase-shifting rectifier transformer according to the second embodiment of the present invention.
Fig. 4 is a schematic diagram of the connection of the coarse tuning winding and the fine tuning winding according to the second embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
Wherein A, B and C are high-voltage three-phase line ends; 1-22 are static contacts; o is a high-voltage neutral point; a3, B3 and C3 are input ends of compensation windings; am, bm and Cm are modulation output ends; o3 is the neutral point of the modulation output side. In the present embodiment, the modulation output side neutral point and the compensation neutral point are common, so in the present embodiment, 03 is the modulation output side and the compensation side common neutral point.
The embodiment is basically as shown in the attached figures 1 and 2: a voltage-regulating phase-shifting rectifier transformer comprises a rectifier main transformer, a voltage-regulating transformer and a series transformer, wherein the voltage-regulating transformer is separated from the rectifier main transformer.
The rectifying main transformer comprises a first main transformer high-voltage basic winding, a first phase-shifting winding, a first main transformer low-voltage winding, a second main transformer high-voltage basic winding, a second phase-shifting winding and a second main transformer low-voltage winding; the first main transformer low-voltage winding and the second main transformer low-voltage winding are respectively a valve side low-voltage star connection winding and a valve side low-voltage angle connection winding; in this embodiment, the input ends corresponding to the first main transformer high-voltage basic winding and the second main transformer high-voltage basic winding are a, B, and C, respectively, that is, a, B, and C correspond to the input ends on the network side;
the series transformer comprises a first series of high-voltage basic windings and a first series of low-voltage windings, and a second series of high-voltage basic windings and a second series of low-voltage windings;
the first main transformer low-voltage winding and the first series low-voltage winding are connected in series respectively to form a valve side low-voltage star-connected 8-shaped winding and an angle-connected 8-shaped winding; the main rectifier transformer and the series transformer are combined together through a valve side low-voltage star connection 8-shaped winding and an angle connection 8-shaped winding structure to form a double 8-shaped winding main and series transformer body combined structure.
The voltage regulating transformer comprises a basic winding, a third phase-shifting winding, a coarse regulating winding and a fine regulating winding; the coarse adjustment winding and the fine adjustment winding realize multi-stage coarse and fine continuous voltage regulation through a coarse and fine adjustment on-load voltage regulation switch; the coarse adjusting winding and the fine adjusting winding form an adjusting output side to supply power to the first series of high-voltage basic windings and the second series of high-voltage basic windings in an exciting mode so as to achieve current balance output of 12 phases on the valve side. In this embodiment, the numbers of the basic windings, the coarse adjustment windings and the fine adjustment windings are all in one-to-one correspondence. The problem that the balance and symmetry of output voltages and impedance of two valve side windings of a lower valve side low-voltage star connection winding and a valve side low-voltage angle connection winding of a rectifier circuit structure in a structural form of a single-unit 12-pulse rectifier circuit in the prior art are difficult to achieve the consistency is solved through the arrangement of the regulating transformer. In this embodiment, the in-phase head ends of the first main transformer high-voltage basic winding, the second main transformer high-voltage basic winding and the modulated basic winding are respectively connected in parallel to the three-phase line ends of the network side high voltages a, B and C.
The coarse tuning winding comprises a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil and a fifth coarse tuning coil which are sequentially connected in series; in this embodiment, the number of coarse and fine tuning stages includes 79, 95, and 107 stages, and the corresponding coarse tuning winding also changes with the change of the stage number, for example, at 79 stages, the corresponding coarse tuning winding includes a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, and a fourth coarse tuning coil, which are sequentially connected in series, and the total number is 4, and at 95 stages and 107 stages, the corresponding coarse tuning winding becomes a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil, a fifth coarse tuning coil, which are sequentially connected in series, and the total number is five. Of course, the variation of the coarse tuning winding may be different from the corresponding fine tuning winding, the matching gear of the 79-level and 95-level fine tuning windings includes a linear 16-level gear, and the matching gear of the 107-level fine tuning winding is an 18-level gear, while in this embodiment, if the corresponding 95-level coarse and fine tuning winding includes a first coarse tuning winding, a second coarse tuning winding, a third coarse tuning winding, a fourth coarse tuning winding, and a fifth coarse tuning winding, and the matching fine tuning winding is a linear 16-level gear. The voltage regulation of the voltage regulation winding is more diversified through the change of various stages and the matching of corresponding fine-regulation gears, and the use scene of the voltage regulation winding is greatly increased.
The compensation winding comprises a second coarse tuning coil and a basic compensation coil; one end of the compensation winding is connected with a Y-connection compensation winding input end, and the other end of the basic compensation coil is connected between the first coarse tuning coil and the second coarse tuning coil in series; a modulation output side and a compensation side share a neutral point between the second coarse tuning coil and the third coarse tuning coil; the common neutral point of the modulation output side and the compensation side is superposed with a fixed contact arranged between the first coarse tuning coil and the second coarse tuning coil;
the static coarse and fine adjustment on-load voltage regulation switch comprises a first moving contact, a second moving contact and a plurality of static contacts;
the static contact is arranged on two sides of the first coarse tuning coil, the second coarse tuning coil, the third coarse tuning coil, the fourth coarse tuning coil and the fifth coarse tuning coil; the static contact is also arranged on a plurality of outlet ends of the fine tuning winding.
The outlet of the lower end part of the fine adjustment winding is also connected with a first moving contact; the first moving contact is used for being connected with a fixed contact on the coarse tuning coil; the first moving contact moves on the static contact of the coarse tuning coil to select a corresponding coarse tuning tapping position; in this embodiment, the first movable contact can only be connected with one of the fixed contacts in the coarse tuning winding, that is, the first movable contact moves on the fixed contact on the coarse tuning coil to select the corresponding coarse tuning tapping position, so that an operator can adjust the first movable contact as required, and further realize the selection of the position of the fixed contact of the coarse tuning coil connected with the first movable contact, thereby controlling the number of coils of the coarse tuning winding. In this embodiment, the first movable contact is arranged at the lower end of the fine tuning winding.
The fine tuning coil end is provided with a second moving contact of the fine tuning on-load voltage regulation switch, the second moving contact is used for being connected with the fine tuning coil end, in the embodiment, the second moving contact can only be connected with one fixed contact in the fine tuning winding, and therefore the fixed contact of the second moving contact on the fine tuning winding moves to select a corresponding fine tuning tapping position; and the second moving contact is connected with the first high-voltage basic winding and the second high-voltage basic winding. In the embodiment, the static contacts between the coils in the coarse tuning winding are respectively 17-22; the static contacts arranged on the fine tuning winding are 1-16 respectively; the common neutral point of the modulation output side and the compensation side is positioned at the static contact 19, and the first moving contact of the corresponding coarse and fine modulation on-load voltage regulating switch moves back and forth between the static contacts 17-22, so that the effects of multi-stage coarse modulation and charged switching and series polarity changing are realized. In order to enable the voltage regulation process to be more accurate, fine regulation is performed after coarse regulation, specifically, a leading-out end of the lower end portion of a fine regulation winding is connected with a corresponding first moving contact, and a corresponding second moving contact moves on fixed contacts 1-16, so that the number of turns of a coil of the fine regulation winding is changed, and fine regulation is achieved.
Example two
As shown in fig. 3 and 4, compared with the first embodiment, the present embodiment is different in that: corresponding modulation output side neutral points are respectively arranged between the second coarse tuning coils and the third coarse tuning coils of the A-phase coarse tuning winding, the B-phase coarse tuning winding and the C-phase coarse tuning winding, and the static contacts are respectively arranged between the second coarse tuning coils and the third coarse tuning coils of the A-phase coarse tuning winding, the B-phase coarse tuning winding and the C-phase coarse tuning winding; namely, the neutral point O3 on the modulation output side is untied into Xm, ym and Zm, and the modulation output phase voltage is always taken between Am (Bm and Cm) and a fixed contact 19, so that the effect of live-line reversing and series polarity changing is ensured when multi-stage coarse modulation is realized, and meanwhile, a fifth coarse modulation coil and a series compensation coil which are used in a high-voltage section and a low-voltage section are taken to operate and are idle form a D-connection compensation winding;
specifically, the coarse tuning winding comprises an A-phase coarse tuning winding, a B-phase coarse tuning winding and a C-phase coarse tuning winding; the fine tuning winding comprises an A-phase fine tuning winding, a B-phase fine tuning winding and a C-phase fine tuning winding; the compensation winding comprises an A-phase compensation winding, a B-phase compensation winding and a C-phase compensation winding;
the A-phase compensation winding, the B-phase compensation winding and the C-phase compensation winding all comprise fifth coarse tuning coils and series compensation coils;
the A-phase coarse tuning winding, the B-phase coarse tuning winding and the C-phase coarse tuning winding respectively comprise a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil and a fifth coarse tuning coil which are sequentially connected in series;
the outlet of the lower end part of the series compensation coil of the phase B compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the phase A coarse tuning winding and led out of the input end A3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the C-phase compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the B-phase coarse tuning winding and led out of the input end B3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the A-phase compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the C-phase coarse tuning winding and led out of the input end C3 of the compensation winding.
In this embodiment, the extending D terminal is adopted for tuning, specifically, the corresponding D terminal compensation winding is completed by taking a section of coarse tuning coil, in which the high-voltage section operates and the low-voltage section is idle, and the series compensation coil, so that the utilization rate of the whole coil structure is higher. The D-connection compensation winding input ends are respectively A3, B3 and C3, and the compensation winding input end A3, the compensation winding input end B3 and the compensation winding input end C3 correspond to each other in sequence; wherein A3, B3 and C3 are respectively connected with corresponding series compensation coils, in particular to a static contact 21 between a fourth coarse tuning coil and a fifth coarse tuning coil, then the other ends of the series compensation coils are respectively connected with one end of the fifth coarse tuning coil in the corresponding coarse tuning winding, the outlet of the lower end part of the series compensation coil of the B-phase compensation winding is connected with a fixed contact 21 between the fourth coarse tuning coil and the fifth coarse tuning coil of the A-phase coarse tuning winding and led out of the input end A3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the C-phase compensation winding is connected with a fixed contact 21 between a fourth coarse tuning coil and a fifth coarse tuning coil of the B-phase coarse tuning winding and led out of an input end B3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the A-phase compensation winding is connected with the fixed contact 21 between the fourth coarse tuning coil and the fifth coarse tuning coil of the C-phase coarse tuning winding and led out of the input end C3 of the compensation winding to form a corresponding D-connection compensation winding.
The compensation winding of the scheme has the advantages that a section of coarse tuning winding which is operated in a high-voltage section and is idle in a low-voltage section and a series compensation winding are adopted to be jointly used, the structural utilization rate of the coil is higher, the structure is material-saving, the cost is low, the size is small, and meanwhile, the electrified switching and series polarity changing are realized while the multi-stage on-load continuous voltage regulation is realized.
The above description is only an example of the present invention, and the general knowledge of the known specific technical solutions and/or characteristics and the like in the solutions is not described herein too much. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (4)
1. A voltage-regulating phase-shifting rectifier transformer is characterized in that: the transformer comprises a rectifying main transformer, a regulating transformer and a series transformer, wherein the regulating transformer is arranged separately from the rectifying main transformer;
the rectifier main transformer comprises a first main transformer high-voltage basic winding, a first phase-shifting winding, a first main transformer low-voltage winding, a second main transformer high-voltage basic winding, a second phase-shifting winding and a second main transformer low-voltage winding;
the series transformer comprises a first series of high voltage basic windings and a first series of low voltage windings, a second series of high voltage basic windings and a second series of low voltage windings;
the first main transformer low-voltage winding and the first series low-voltage winding are connected in series respectively to form a valve side low-voltage star-connected 8-shaped winding and an angle-connected 8-shaped winding; the main rectifier transformer and the series transformer are respectively combined together through a valve side low-voltage star connection 8-shaped winding and an angle connection 8-shaped winding structure to form a double 8-shaped winding main and series transformer body combined structure;
the voltage regulating transformer comprises a basic winding, a third phase-shifting winding, a coarse regulating winding, a fine regulating winding and a compensation winding;
the coarse adjustment winding and the fine adjustment winding realize multi-stage coarse and fine continuous voltage regulation through a coarse and fine adjustment on-load voltage regulation switch; the coarse adjusting winding and the fine adjusting winding form an adjusting output side to supply power to the first series of high-voltage basic windings and the second series of high-voltage basic windings in an exciting way.
2. The voltage-regulating phase-shifting rectifier transformer of claim 1, wherein: the coarse tuning winding comprises a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil and a fifth coarse tuning coil which are sequentially connected in series;
the coarse and fine adjustment on-load voltage regulation switch comprises a first moving contact, a second moving contact and a plurality of static contacts;
the static contact is arranged on two sides of the first coarse tuning coil, the second coarse tuning coil, the third coarse tuning coil, the fourth coarse tuning coil and the fifth coarse tuning coil; the fixed contacts are also arranged on a plurality of outlets of the fine tuning winding;
the outlet of the lower end part of the fine adjustment winding is also connected with a first moving contact; the first moving contact is used for being connected with a fixed contact on the coarse tuning coil; the first moving contact moves on a static contact of the coarse tuning coil to select a corresponding coarse tuning tapping position; the second moving contact is arranged on the static contact of the fine adjustment winding and is used for being connected with the static contact of the fine adjustment winding, and the second moving contact moves on the static contact of the fine adjustment winding to select a corresponding fine adjustment tapping position; and the second moving contact is respectively connected with the first high-voltage basic winding and the second high-voltage basic winding.
3. The voltage-regulating phase-shifting rectifier transformer according to claim 2, wherein:
the compensation winding comprises a second coarse tuning coil and a basic compensation coil; one end of the basic compensation coil is connected in series between the first coarse tuning coil and the second coarse tuning coil, and a modulation output side and a compensation side shared neutral point are arranged between the second coarse tuning coil and the third coarse tuning coil; and the other end of the basic compensation coil is connected with a Y-connection compensation winding input end.
4. The voltage-regulating phase-shifting rectifier transformer according to claim 2, wherein: the coarse tuning winding comprises an A-phase coarse tuning winding, a B-phase coarse tuning winding and a C-phase coarse tuning winding; the fine tuning winding comprises an A-phase fine tuning winding, a B-phase fine tuning winding and a C-phase fine tuning winding; the compensation winding comprises an A-phase compensation winding, a B-phase compensation winding and a C-phase compensation winding;
the A-phase compensation winding, the B-phase compensation winding and the C-phase compensation winding all comprise fifth coarse tuning coils and series compensation coils;
the A-phase coarse tuning winding, the B-phase coarse tuning winding and the C-phase coarse tuning winding respectively comprise a first coarse tuning coil, a second coarse tuning coil, a third coarse tuning coil, a fourth coarse tuning coil and a fifth coarse tuning coil which are sequentially connected in series;
the outlet of the lower end part of the series compensation coil of the phase B compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the phase A coarse tuning winding and led out of the input end A3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the C-phase compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the B-phase coarse tuning winding and led out of the input end B3 of the compensation winding; the outlet of the lower end part of the series compensation coil of the A-phase compensation winding is connected with the fixed contact between the fourth coarse tuning coil and the fifth coarse tuning coil of the C-phase coarse tuning winding and led out of the input end C3 of the compensation winding.
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| CN202310088429.XA CN115910576A (en) | 2023-02-08 | 2023-02-08 | Voltage-regulating phase-shifting rectifier transformer |
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| CN202310088429.XA CN115910576A (en) | 2023-02-08 | 2023-02-08 | Voltage-regulating phase-shifting rectifier transformer |
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