CN113593864B - Split type on-load tap-changer and control method thereof - Google Patents
Split type on-load tap-changer and control method thereof Download PDFInfo
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- CN113593864B CN113593864B CN202110702946.2A CN202110702946A CN113593864B CN 113593864 B CN113593864 B CN 113593864B CN 202110702946 A CN202110702946 A CN 202110702946A CN 113593864 B CN113593864 B CN 113593864B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0011—Voltage selector switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H2009/0061—Monitoring tap change switching devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The application provides a split type on-load tap-changer and a control method thereof. The split on-load tap changer comprises a tap selector synchronization unit and a tap switch control unit, wherein the tap selector synchronization unit is arranged outside a transformer and synchronously acts with a tap selector of the transformer through a first transmission unit, the tap selector acts when the voltage of the transformer is regulated, and the tap selector synchronization unit sends out an action in-place signal of the tap selector after detecting that the tap selector acts in place; the tapping switch control unit is arranged outside the transformer and receives the tapping selector action in-place signal from the tapping selector synchronization unit to control the change-over switch of the transformer to switch the current.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a split type on-load tap-changer and a control method thereof.
Background
The on-load tap-changer has the main function of realizing voltage regulation of a transformer, and the on-load tap-changer (OLTC for short below) of a converter transformer in an extra-high voltage direct current transmission project is more severe than the operation working condition of a common power transformer: 1. the converter is operated for a long time at full load, and the current flowing through the OLTC is large; 2. the load current flowing through the converter transformer on-load tap-changer is not sine wave, but current waveform with a phase change process, the di/dt of zero crossing point is large, and arc extinction is difficult. 3. The converter transformer OLTC acts very frequently, the times of the acts in the operation can reach 4000 times/year, and the requirement on the mechanical life is high; 4. the internal action is not monitored by any electric quantity, is in a black box state, and cannot judge the transient state working state in the switching process. Due to the specificity of the extra-high voltage converter transformer OLTC, at present, the OLTC in all extra-high voltage direct current transmission projects in China is provided by foreign manufacturers, and accident analysis and improvement cannot be controlled independently.
At present, no matter the OLTC is of a non-vacuum type or a vacuum type, insulating oil is needed to be used as a medium for cutting off or radiating, and as the insulating oil is installed inside the transformer, the OLTC is extremely easy to generate fire explosion when the OLTC fails, so that the whole transformer is completely burnt, and the consequence is serious.
Aiming at the problems, the prior art provides a novel OLTC, which is added with 2 isolating devices to isolate a tapping selector from a change-over switch, and solves the problem of influence of the self fault of the change-over switch on a transformer body. However, the problem of controlling the operation between the tapping selector and the change-over switch is not considered, so that the situation that the tapping selector is not preselected in place and the change-over switch starts to operate is very easy to occur, and the change-over switch explodes.
Disclosure of Invention
The embodiment of the application provides a split type on-load tap changer, which comprises a tap selector synchronization unit and a tap switch control unit, wherein the tap selector synchronization unit is arranged outside a transformer and synchronously acts with a tap selector of the transformer through a first transmission unit, the tap selector acts when the voltage of the transformer is regulated, and the tap selector synchronization unit sends out an action in-place signal of the tap selector after detecting that the tap selector acts in place; the tapping switch control unit is arranged outside the transformer and receives the tapping selector action in-place signal from the tapping selector synchronization unit to control the change-over switch of the transformer to switch the current.
According to some embodiments, the split on-load tap changer further comprises a tap selector, a tap selector driving motor, a change-over switch and an isolation module, wherein the tap selector is arranged inside the transformer and is connected with a voltage regulating winding of the transformer; the tapping selector driving motor is arranged outside the transformer and is connected with the tapping selector through a first transmission unit and a second transmission unit to drive the tapping selector to act; the change-over switch is arranged outside the transformer and is respectively connected with the tapping selector and the tapping switch control unit; the isolation module includes a conductor connected with the tap selector and the diverter switch and an insulating housing isolating the conductor from the transformer housing.
According to some embodiments, the first transmission unit comprises a first gear box connected with the tap selector synchronization unit by a first transmission shaft and connected with the tap selector by a second transmission shaft.
According to some embodiments, the second transmission unit comprises a second gear box connected to the tap selector drive motor via a third transmission shaft and to the first gear box via a fourth transmission shaft.
According to some embodiments, the tap changer control unit is further connected to the tap selector driving motor, and after receiving a command for adjusting the voltage of the transformer, the tap selector driving motor is controlled to drive the tap selector to act.
According to some embodiments, the voltage regulating winding of the transformer comprises N taps, each tap corresponds to 1 gear, and N is a natural number.
According to some embodiments, the isolation module comprises a first isolation unit and a second isolation unit, which are connected with the tap selector and the change-over switch, wherein one side of the first isolation unit and one side of the second isolation unit are arranged inside the transformer, the other side of the first isolation unit is arranged outside the transformer, the first isolation unit comprises a first conductor and a first shell, and the second isolation unit comprises a second conductor and a second shell.
According to some embodiments, the tap selector comprises a movable first contact, a movable second contact and N fixed contacts, the movable first contact being connected with the diverter switch through the first isolation unit; the movable second contact is connected with the change-over switch through the second isolation unit; the N fixed contacts are respectively connected with N taps of the voltage regulating winding of the transformer in a one-to-one correspondence.
According to some embodiments, the diverter switch comprises a first input and a second input, the first input being connected to the tap selector through the first isolation unit; the second input terminal is connected with the tapping selector through the second isolation unit.
According to some embodiments, the diverter switch comprises an oil switch, a vacuum switch, or a power electronic switch, the external insulation being gas or liquid insulation.
According to some embodiments, the tap selector action in place signal comprises a node signal or an optical signal.
The embodiment of the application also provides a control method of the split on-load tap-changer, which comprises the following steps: after receiving a command for regulating the voltage of the transformer, the tapping switch control unit controls the tapping selector to drive the motor to drive the tapping selector to act; and receiving a tapping selector action in-place signal from a tapping selector synchronization unit, and controlling a change-over switch of the transformer to switch the current.
According to the technical scheme, the isolation device is arranged between the change-over switch and the tapping selector, the tapping selector synchronization unit and the tapping switch control unit are adopted, the change-over switch which is subjected to the switching process and is extremely prone to faults is separated from the transformer, serious faults caused by action time sequence errors of the tapping selector and the change-over switch are avoided, the influence of the faults of the existing on-load tapping switch on the transformer body is solved, and engineering reliability is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a split on-load tap-changer according to an embodiment of the present application.
Fig. 2 is a schematic flow chart of a control method of a split on-load tap-changer according to an embodiment of the present application.
Fig. 3 is a schematic working diagram of a split on-load tap-changer according to an embodiment of the present application.
Fig. 4 is a schematic working diagram of another split on-load tap-changer according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be understood that the terms "first," "second," and the like in the claims, specification, and drawings of this application are used for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises" and "comprising," when used in the specification and claims of this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Fig. 1 is a schematic diagram of a split on-load tap changer according to an embodiment of the present application, which includes a tap selector 300, a tap selector driving motor 301, a diverter switch 500, an isolation module 400, a tap selector synchronization unit 700, and a tap switch control unit 600.
The tap selector 300 is disposed inside the transformer 100 and connected to the voltage regulating winding 200 of the transformer 100. The tap selector driving motor 301 is disposed outside the transformer 100, and is connected to the tap selector 300 through a first transmission unit and a second transmission unit to drive the tap selector 300. The change-over switch 500 is provided outside the transformer 100 and is connected to the tap selector 300 and the tap switch control unit 600, respectively. The isolation module 400 includes a conductor connected to the tap selector 300 and the diverter switch 500 and an insulating housing that isolates the conductor from the transformer 100 housing. The tap selector synchronization unit 700 is disposed outside the transformer 100, and synchronously operates with the tap selector 300 through the first transmission unit, the tap selector 300 operates when the voltage of the transformer 100 is regulated, and after the tap selector synchronization unit 700 detects that the tap selector 300 is in place, the tap selector 300 operates in place. The tap changer control unit 600 is disposed outside the transformer 100, and receives the tap selector 300 in-place signal from the tap selector synchronization unit 700, and controls the switch 500 of the transformer 100 to switch the current. Tap selector 300 action in place signals include, but are not limited to, node signals or optical signals.
The first transmission unit comprises a first gear box 306 connected to the tap selector synchronization unit 700 via a first transmission shaft 305 and to the tap selector 300 via a second transmission shaft 307. The first transmission shaft 305 is disposed outside the transformer 100, the second transmission shaft 307 is disposed inside the transformer 100, and the tap selector synchronization unit 700 and the tap selector 300 are synchronously operated under the driving of the first gear box 306.
The second transmission unit comprises a second gear box 303 connected to the tap selector drive motor 301 via a third transmission shaft 302 and to the first gear box 306 via a fourth transmission shaft 304. The third transmission shaft 302 is disposed outside the transformer 100, and the fourth transmission shaft 304 is disposed outside the transformer 100. The tap selector driving motor 301 drives the tap selector 300 to act through the first transmission unit and the second transmission unit.
The tap changer control unit 600 is further connected to the tap selector driving motor 301, and after receiving a command for adjusting the voltage of the transformer 100, controls the tap selector driving motor 301 to drive the tap selector 300 to operate.
The voltage regulating winding 200 of the transformer 100 includes N taps, each tap corresponding to 1 gear, N being a natural number.
The isolation module 400 includes a first isolation unit 401 and a second isolation unit 402, which are connected to the tap selector 300 and the change-over switch 500, one side of the first isolation unit 401 and one side of the second isolation unit 402 are disposed inside the transformer, and the other side is disposed outside the transformer. The first isolation unit comprises a first conductor and a first shell, the second isolation unit comprises a second conductor and a second shell, and the first shell and the second shell electrically isolate the first conductor and the second conductor from the transformer 100 shell respectively, and simultaneously play a role in sealing a transformer oil chamber and a role in sealing the transformer oil chamber.
One end of the two isolation units is connected with the tapping selector 300, and the other end is connected with the change-over switch 500, so that current in the transformer voltage regulating winding 200 is led out from the tapping selector 300 to the change-over switch 500 through the first isolation unit 401 or the second isolation unit 402.
The tap selector 300 comprises a movable first contact connected to the change-over switch 500 through a first isolation unit 401, a movable second contact connected to the change-over switch 500 through a second isolation unit 402, and N fixed contacts; the N fixed contacts are respectively connected with N taps of the voltage regulating winding 200 of the transformer 100, and N is a natural number in one-to-one correspondence.
The change-over switch 500 comprises a first input terminal connected to the tap selector 300 via a first isolation unit 401 and a second input terminal connected to the tap selector 300 via a second isolation unit 402.
The switch 500 includes an oil switch, a vacuum switch, or an electric type switch, and the external insulation is gas or liquid insulation, but is not limited thereto.
Fig. 2 is a schematic flow chart of a control method of a split on-load tap-changer according to an embodiment of the present application.
In S10, after receiving the command to adjust the voltage of the transformer 100, the tap changer control unit 600 controls the tap selector driving motor 301 to drive the tap selector 300.
The present embodiment is described based on two split on-load tap-changer operation schematic diagrams of the embodiments of fig. 3 and 4.
As shown in fig. 3, the movable second contact of the tap selector 300 is in the 8 th gear of the transformer voltage regulating winding, the movable first contact is in the 7 th gear of the transformer voltage regulating winding 200, and current flows through the 8 th gear of the transformer voltage regulating winding 200, the movable second contact of the tap selector 300, the second isolation unit 402, and the switch 500.
At this time, after receiving the voltage upshift action command of the external regulating transformer 100, the tap changer control unit 600 sends an action command to the tap selector driving motor 301, and the tap selector driving motor 301 rotates to drive the tap selector 300 to act through the third transmission shaft 302, the second gear box 303, the fourth transmission shaft 304, the first gear box 306 and the second transmission shaft 307, so that the movable first contact is moved to the 9 th gear of the transformer regulating winding 200 shown in fig. 4 in the non-excited state, and preparation is made for the subsequent current switching.
In S20, the tap changer control unit 600 receives the tap selector 300 in-place signal from the tap selector synchronization unit 700, and controls the change-over switch 500 of the transformer 100 to perform current switching.
The tap selector synchronization unit 700 obtains a signal that the movable first contact of the tap selector 300 is in place through the third drive shaft 302, the second gear box 303, the fourth drive shaft 304, the first gear box 306, and the first drive shaft 305, and sends an electrical node or optical signal to the tap switch control unit 600. After receiving the in-place signal of the movable first contact of the tap selector 300, the tap switch control unit 600 sends an action command to the change-over switch 500, and the change-over switch 500 performs a current switching operation to switch the current from the movable second contact to the movable first contact of the tap selector 300. At this time, as shown in fig. 4, the current of the transformer 100 flows through the 9 th gear of the transformer voltage regulating winding 200, the movable first contact of the tap selector 300, the first isolation unit 401, and the switching switch 500, respectively, to complete the upshift operation.
The downshift operation is consistent with the above-mentioned process, and the action direction is opposite, and detailed description is omitted.
According to the technical scheme, the isolation device is arranged between the change-over switch and the tapping selector, the tapping selector synchronization unit and the tapping switch control unit are adopted, the change-over switch which is subjected to the switching process and is extremely prone to faults is separated from the transformer, serious faults caused by action time sequence errors of the tapping selector and the change-over switch are avoided, the influence of the faults of the existing on-load tapping switch on the transformer body is solved, and engineering reliability is guaranteed.
The above embodiments are only for illustrating the technical ideas of the present application, and the protection scope of the present application is not limited thereto, and any modification made on the basis of the technical scheme according to the technical ideas presented in the present application falls within the protection scope of the present application.
Claims (11)
1. A split on-load tap-changer comprising:
the tapping selector synchronization unit is arranged outside the transformer and synchronously acts with a tapping selector of the transformer through the first transmission unit, the tapping selector acts when the voltage of the transformer is regulated, and the tapping selector synchronization unit sends out a tapping selector acting in-place signal after detecting that the tapping selector acts in place;
the tapping switch control unit is arranged outside the transformer and used for receiving the tapping selector action in-place signal from the tapping selector synchronization unit and controlling the change-over switch of the transformer to switch the current;
the tapping selector is arranged inside the transformer and is connected with the voltage regulating winding of the transformer;
the change-over switch is arranged outside the transformer and is respectively connected with the tapping selector and the tapping switch control unit; an isolation module comprising a conductor connected to the tap selector and the diverter switch and an insulating housing isolating the conductor from the transformer housing;
the first transmission unit comprises a first gear box, is connected with the tapping selector synchronization unit through a first transmission shaft and is connected with the tapping selector through a second transmission shaft.
2. The split on-load tap-changer of claim 1, further comprising:
and the tapping selector driving motor is arranged outside the transformer and is connected with the tapping selector through the first transmission unit and the second transmission unit to drive the tapping selector to act.
3. The split on-load tap-changer of claim 2, wherein the second transmission unit comprises:
the second gear box is connected with the tapping selector driving motor through a third transmission shaft and is connected with the first gear box through a fourth transmission shaft.
4. The split on-load tap changer of claim 2, wherein the tap changer control unit is further connected to the tap selector drive motor and upon receiving a command to adjust the transformer voltage, controls the tap selector drive motor to drive the tap selector.
5. The split on-load tap changer of claim 1, wherein the voltage regulating winding of the transformer comprises N taps, each tap corresponding to 1 gear, N being a natural number.
6. The split on-load tap changer of claim 2, wherein the isolation module comprises a first isolation unit and a second isolation unit connected with the tap selector and the diverter switch, one side of the first isolation unit and one side of the second isolation unit are disposed inside the transformer, the other side of the first isolation unit is disposed outside the transformer, the first isolation unit comprises a first conductor and a first housing, and the second isolation unit comprises a second conductor and a second housing.
7. The split on-load tap changer of claim 6, wherein the tap selector comprises:
the movable first contact is connected with the change-over switch through the first isolation unit;
the movable second contact is connected with the change-over switch through the second isolation unit;
and the N fixed contacts are respectively connected with N taps of the voltage regulating winding of the transformer, correspond to each other one by one, and are natural numbers.
8. The split on-load tap-changer of claim 6, wherein the diverter switch comprises:
the first input end is connected with the tapping selector through the first isolation unit;
and the second input end is connected with the tapping selector through the second isolation unit.
9. The split on-load tap-changer of claim 1, wherein the diverter switch comprises an oil switch, a vacuum switch, or a power electronic switch, and the external insulation is gas or liquid insulation.
10. The split on-load tap-changer of claim 1, wherein the tap-selector-action-in-place signal comprises a node signal or an optical signal.
11. A method of controlling a split on-load tap changer according to any one of claims 1-10, comprising:
after receiving a command for regulating the voltage of the transformer, the tapping switch control unit controls the tapping selector to drive the motor to drive the tapping selector to act;
and receiving a tapping selector action in-place signal from a tapping selector synchronization unit, and controlling a change-over switch of the transformer to switch the current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110702946.2A CN113593864B (en) | 2021-06-24 | 2021-06-24 | Split type on-load tap-changer and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110702946.2A CN113593864B (en) | 2021-06-24 | 2021-06-24 | Split type on-load tap-changer and control method thereof |
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| Publication Number | Publication Date |
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| CN113593864A CN113593864A (en) | 2021-11-02 |
| CN113593864B true CN113593864B (en) | 2023-06-27 |
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| JPH01107620A (en) * | 1987-10-20 | 1989-04-25 | Toshiba Corp | On-load tap changer |
| JP4703473B2 (en) * | 2006-04-19 | 2011-06-15 | 株式会社東芝 | Load tap changer |
| CN101409173B (en) * | 2008-12-04 | 2011-06-08 | 天水长城开关厂有限公司 | Operating mechanism for tri-station isolating switch of gas insulated metal sealing switchgear |
| CN101958195A (en) * | 2010-09-19 | 2011-01-26 | 中国农业大学 | Arc-less on-load tap-changer for transformer |
| CN106409549B (en) * | 2016-12-14 | 2018-09-14 | 浙江腾龙电器有限公司 | A kind of horizontal bar shaped composite vacuum load ratio bridging switch |
| CN107221463B (en) * | 2017-06-22 | 2019-08-09 | 西安森宝电气工程有限公司 | A kind of vacuum on-load operation switch |
| CN111312502A (en) * | 2020-02-28 | 2020-06-19 | 南京南瑞继保电气有限公司 | On-load tap-changer, control method thereof and transformer |
| CN111540627A (en) * | 2020-04-22 | 2020-08-14 | 国家电网有限公司 | Power electronic type change-over switch arrangement structure of on-load tap-changer for converter transformer |
| CN111540626A (en) * | 2020-04-22 | 2020-08-14 | 国家电网有限公司 | Mechanical type change-over switch arrangement structure of on-load tap-changer for converter transformer |
| CN111900000A (en) * | 2020-08-20 | 2020-11-06 | 上海华明电力设备制造有限公司 | Separating tap changer |
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2021
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