CN113593865B - Split step-by-step on-load tap-changer and control method thereof - Google Patents
Split step-by-step on-load tap-changer and control method thereof Download PDFInfo
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- CN113593865B CN113593865B CN202110703838.7A CN202110703838A CN113593865B CN 113593865 B CN113593865 B CN 113593865B CN 202110703838 A CN202110703838 A CN 202110703838A CN 113593865 B CN113593865 B CN 113593865B
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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
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/56—Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
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Abstract
The application provides a split step-type on-load tap-changer and a control method thereof. The split step-by-step on-load tap-changer comprises an isolation module and a change-over switch, wherein one end of the isolation module is arranged inside the transformer and is connected with a selection switch of the transformer, and the other end of the isolation module is arranged outside the transformer; the change-over switch is arranged outside the transformer and connected with the isolation module; the switching switch comprises two branches, each branch comprises a through-flow branch and a transition branch which are connected in parallel, the through-flow branch comprises a first switch and a second switch which are connected in series, the transition branch comprises a third switch, a fourth switch and a current limiting element, and the fourth switch and the current limiting element are connected in parallel and then connected in series with the third switch; the input ends of the two branches are respectively connected with the two output contacts of the selection switch through the isolation module, and the output ends of the two branches are connected.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a split distributed on-load tap-changer and a control method thereof.
Background
The on-load tap-changer has the main function of realizing voltage regulation of the transformer. On-load tap changers (OLTC) of converter transformers in extra-high voltage direct current transmission engineering are worse than the operation conditions of common power transformers.
First, the converter transformer is operated at full load for a long period of time, and the current flowing through OLTC is large. Secondly, the load current flowing through the on-load tap-changer of the converter transformer is not sine wave, but current waveform with a phase change process, di/dt of zero crossing point is large, and arc extinction is difficult. Then, the on-load tapping switch OLTC of the converter transformer is very frequent in action, the action times in operation can reach 4000 times/year, and the mechanical life requirement is high. Finally, 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 an on-load tap changer (OLTC) of an extra-high voltage converter transformer, the OLTC in all extra-high voltage direct current transmission projects in China is provided by foreign manufacturers at present, and accident analysis and improvement cannot be controlled independently.
The traditional OLTC one-time switching process involves multiple switching and multiple switching steps, wherein an abnormality occurs in one step, the mechanical movement still continues to execute the next action, and larger faults such as inter-stage short circuit and the like are extremely easy to cause.
Disclosure of Invention
The embodiment of the application provides a split step-type on-load tap changer, which comprises an isolation module and a change-over switch, wherein one end of the isolation module is arranged inside a transformer and is connected with a selection switch of the transformer, and the other end of the isolation module is arranged outside the transformer; the change-over switch is arranged outside the transformer and connected with the isolation module; the switching switch comprises two branches, each branch comprises a through-flow branch and a transition branch which are connected in parallel, the through-flow branch comprises a first switch and a second switch which are connected in series, the transition branch comprises a third switch, a fourth switch and a current limiting element, and the fourth switch and the current limiting element are connected in parallel and then connected in series with the third switch; the input ends of the two branches are respectively connected with the two output contacts of the selection switch through the isolation module, and the output ends of the two branches are connected.
According to some embodiments, the split step on-load tap changer further comprises a selection switch, wherein the selection switch is arranged inside the transformer and comprises n input contacts and n output contacts, and the n input contacts are in one-to-one correspondence connection with n taps of a voltage regulating winding of the transformer.
According to some embodiments, the isolation module comprises a first isolation unit and a second isolation unit, the first isolation unit being connected between one output contact of the selector switch and an input end of one branch of the diverter switch; the second isolation unit is connected between the other output contact of the selection switch and the input end of the other branch of the change-over switch.
According to some embodiments, the diverter switch further comprises a voltage limiting element connected between the input ends of the two branches.
According to some embodiments, the voltage limiting element comprises a non-linear resistor.
According to some embodiments, the diverter switch further comprises a first current transformer, a second current transformer, a third current transformer, a fourth current transformer, a fifth current transformer, a sixth current transformer and a seventh current transformer, wherein the first current transformer is connected in series to one branch of the diverter switch; the second current transformer is connected in series to the other branch of the change-over switch; the third current transformer is connected in series to the output end of the change-over switch; the fourth current transformer is connected in series with a through-flow branch of the change-over switch; the fifth current transformer is connected in series with a through-flow branch of the other branch of the change-over switch; the sixth current transformer is connected in series with a transition branch of the change-over switch; the seventh current transformer is connected in series in a transition branch of the other branch of the change-over switch.
According to some embodiments, the transfer switch comprises a mechanical switch comprising at least one of an oil switch, a sulfur hexafluoride switch, a vacuum switch, or a power electronic switch comprising at least one of a silicon controlled rectifier, an insulated gate bipolar thyristor, an electron injection enhanced gate thyristor, an integrated gate commutated thyristor, a metal oxide semiconductor field effect thyristor.
According to some embodiments, the current limiting element comprises a resistor or/and a reactance.
According to some embodiments, the diverter switch is isolated from ground potential by an insulating support.
The embodiment of the application also provides a control method of the split step-type on-load tap-changer, which comprises the following steps: when the transformer carries out on-load voltage regulation, the load current is controlled to be changed from one tap of the voltage regulating winding to another tap; an output contact of a selection switch correspondingly connected with the other tap of the voltage regulating winding is controlled and connected with the other through-flow branch of the change-over switch through an isolation module; and controlling the change-over switch to perform on-load switching operation according to the state of each branch switch and current sampling.
According to some embodiments, the control method further comprises: under the normal working state, the load current of the control transformer flows through any tap of the voltage regulating winding, a selection switch connected with the tap, an isolation module and one branch of the change-over switch, and the rest branches of the change-over switch are in an off state.
According to some embodiments, the controlling the change-over switch performs on-load switching operation according to the state of each branch switch and current sampling, including: closing a fourth switch of a transition branch of the original conduction branch, and switching off a first switch and a second switch of a through-flow branch of the original conduction branch; sampling and judging the zero crossing of the current through a fourth current transformer or a fifth current transformer of the current through branch of the original conduction branch, transferring the load current to a transition branch of the original conduction branch, and switching off a fourth switch of the transition branch of the original conduction branch; sampling and judging the zero crossing of the current through a sixth current transformer or a seventh current transformer of the transition branch of the original conduction branch, transferring the load current to a current limiting element of the transition branch of the original conduction branch, and conducting a third switch of the transition branch of the other branch; the method comprises the steps of respectively sampling and judging through a first current transformer and a second current transformer of two branches, and turning off a third switch of a transition branch of an original conduction branch after a voltage regulating winding of a transformer has circulation through the third switch of the transition branch of the two branches and a current limiting element; judging the zero crossing of the third switch current of the transition branch of the original conduction branch through sampling of the first current transformer or the second current transformer of the original conduction branch, transferring the load current to the third switch and the current limiting element of the transition branch of the other branch, and conducting the fourth switch of the transition branch of the other branch; and after the current transformer of the other branch and the seventh current transformer or the sixth current transformer of the transition branch of the other branch are used for sampling and judging the zero crossing of the current limiting element current of the transition branch of the other branch, the load current is transferred to the fourth switch of the transition branch of the other branch, the first switch and the second switch of the through-flow branch of the other branch are turned on, and the fourth switch of the transition branch of the other branch is turned off.
The technical scheme provided by the embodiment of the application provides a novel on-load tap-changer, and the change-over switch part of the on-load tap-changer is moved outside the transformer body, meanwhile, the digital electric measurement technology is combined, the step control of the transient switching process can be realized, each step of action is monitored and protected, and the problem that the traditional tap-changer cannot stop once the action and cannot monitor and protect a black box is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and 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 step-type 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 step-type on-load tap-changer according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of a branch switching control process of a split step-type on-load tap changer switch according to an embodiment of the present application.
Fig. 4 is a schematic diagram of an operation process of a split step-type on-load tap-changer according to an embodiment of the present application.
Fig. 5 is a second schematic diagram of the operation process of the split step-type on-load tap-changer according to the embodiment of the application.
Fig. 6 is a third schematic diagram of the operation process of the split step-type on-load tap-changer according to the embodiment of the application.
Fig. 7 is a schematic diagram of a working process of a split step-type on-load tap-changer according to an embodiment of the application.
Fig. 8 is a schematic diagram of a working process of a split step-type on-load tap-changer according to an embodiment of the application.
Fig. 9 is a schematic diagram illustrating a working process of a split step-type on-load tap-changer according to an embodiment of the application.
Fig. 10 is a schematic diagram of a split step on-load tap-changer according to an embodiment of the 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 embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be understood that the terms "first," "second," and the like in the claims, specification and drawings of the present 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 the present application are taken to 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 step-type on-load tap-changer according to an embodiment of the present application, including a selector switch 102, an isolation module 300 and a switch 200.
The selector switch 102 is disposed inside the transformer 100, and includes n input contacts and n output contacts, where the n input contacts are connected with n taps of the voltage-regulating winding 101 of the transformer in a one-to-one correspondence manner, and n is a natural number. One end of the isolation module 300 is disposed inside the transformer 100, and is connected to the selection switch 102 of the transformer 100, and the other end of the isolation module 300 is disposed outside the transformer 100. The change-over switch 200 is disposed outside the transformer 100 and connected to the isolation module 300. Insulation of the conductor portion from the transformer 100 housing and sealing of the transformer 100 housing are achieved.
The isolation module 300 includes a first isolation unit 301 and a second isolation unit 302. The first isolation unit 301 is connected between one output contact of the selection switch 102 and the input of one branch of the changeover switch 200. The second isolation unit 302 is connected between the other output contact of the selection switch 102 and the input of the other branch of the change-over switch 200. The first isolation unit 301 and the second isolation unit 302 are isolation sleeves, but not limited thereto.
The change-over switch 200 comprises two branches, each branch comprises a through-flow branch and a transition branch which are connected in parallel, the through-flow branch comprises a first switch and a second switch which are connected in series, the transition branch comprises a third switch, a fourth switch and a current limiting element, and the fourth switch and the current limiting element are connected in parallel and then are connected in series with the third switch. The input ends of the two branches are respectively connected with the two output contacts of the selector switch 200 through the isolation module 300, and the output ends of the two branches are connected. The current limiting element includes, but is not limited to, a resistor or/and a reactance. As shown in fig. 1, the first branch includes a through-current branch and a transition branch, the through-current branch includes a first switch 201 and a second switch 202 connected in series, the transition branch includes a third switch 205, a fourth switch 206 and a current limiting element 211, and the fourth switch 206 and the current limiting element 211 are connected in parallel and then connected in series with the third switch 205. The second branch comprises a through-flow branch and a transition branch which are connected in parallel, wherein the through-flow branch comprises a first switch 203 and a second switch 204 which are connected in series, the transition branch comprises a third switch 207, a fourth switch 208 and a current limiting element 212, and the fourth switch 208 and the current limiting element 212 are connected in parallel and then connected in series with the third switch 207. The input ends A, B of the two branches are respectively connected with the two output contacts of the selector switch 200 through the isolation module 300, and the output ends C of the two branches are connected.
Optionally, the switch 200 further includes a voltage limiting element 221, and the voltage limiting element 221 is connected between the input ends of the two branches. The voltage limiting element includes, but is not limited to, a nonlinear resistor.
Optionally, the transfer switch 200 further includes a first current transformer 231, a second current transformer 232, a third current transformer 233, a fourth current transformer 234, a fifth current transformer 235, a sixth current transformer 236, and a seventh current transformer 237.
The first current transformer 231 is connected in series to one branch of the changeover switch 200. The second current transformer 232 is connected in series to the other branch of the switch 200. The third current transformer 233 is connected in series to the output terminal of the changeover switch 200. And a fourth current transformer connected in series to the through-current branch of one branch of the switch 200. And a fifth current transformer connected in series to the current branch of the other branch of the switch 200. And a sixth current transformer connected in series to the transition branch of one branch of the change-over switch 200. And a seventh current transformer connected in series to a transition branch of the other branch of the switch 200.
Optionally, the change-over switch 200 includes, but is not limited to, at least one of a mechanical switch including, but not limited to, an oil switch, an SF6 (sulfur hexafluoride) switch, a vacuum switch, or a power electronic switch including, but not limited to, at least one of an SCR (silicon controlled rectifier), an IGBT (insulated gate bipolar thyristor), an IEGT (electron injection enhanced gate thyristor), an IGCT (integrated gate commutated thyristor), a MOSFET (metal oxide semiconductor field effect thyristor).
Optionally, the diverter switch 200 is isolated from ground potential by an insulating support.
The technical scheme provided by the embodiment provides a new on-load tap-changer, and the change-over switch part of the on-load tap-changer is moved outside the transformer body to isolate the tap selector from the change-over switch, so that the problem of influence of the fault of the change-over switch on the transformer body is solved.
Fig. 2 is a schematic flow chart of a control method of a split step-type on-load tap-changer according to an embodiment of the present application.
In S10, when the transformer 100 performs on-load voltage regulation, the output contact of the selection switch 102, which is correspondingly connected to the other tap of the voltage regulation winding 101, is controlled to be connected to the other current branch of the switch 200 via the isolation module 300.
In a normal operation state, the load current of the control transformer 100 flows through any tap of the voltage regulating winding 101, the selection switch 102 connected with the tap, the isolation module 300, and one branch of the switch 200, and the other branches of the switch 200 are in an off state, as shown in fig. 4.
When the transformer 100 performs on-load voltage regulation, the load current needs to be switched from one through-current branch of the switch 200 to another through-current branch, and the following description will take the through-current branch of the first branch to the through-current branch of the second branch as an example assuming that the original through-current branch is the through-current branch of the first branch.
The output contact 2 of the selection switch 102, which is controlled to be connected to the other tap of the voltage regulating winding 101, is connected to the input B of the other current branch of the change-over switch 200 via a second isolation unit 302.
In S20, the control switch 200 performs the on-load switching operation according to the state of each branch switch and the current sampling, including the following steps S21 to S26, as shown in fig. 3.
In S21, the fourth switch 206 of the transition branch of the first branch, which is originally turned on, is closed, and the first switch 201 and the second switch 202 of the through-flow branch of the first branch are turned off, as shown in fig. 5.
In S22, the current zero crossing is sampled and judged by the fourth current transformer 234 of the through-current branch of the first branch, the load current is transferred to the transition branch of the first branch, and the fourth switch 206 of the transition branch of the first branch is turned off, as shown in fig. 6.
In S23, the current zero crossing is sampled and judged by the sixth current transformer 236 of the transition branch of the first branch, the load current is transferred to the current limiting element 211 of the transition branch of the first branch, and the third switch 207 of the transition branch of the second branch is turned on, as shown in fig. 7.
In S24, the first current transformer 231 and the second current transformer 232 of the two branches are respectively used for sampling and judging, and after the voltage regulating winding 101 of the transformer has circulation current through the third switches 205, 207 and the current limiting elements 211, 212 of the transition branches of the two branches, the third switch 205 of the transition branch of the first branch is turned off, as shown in fig. 8.
In S25, the first current transformer 231 of the first branch samples and judges that the current of the third switch 205 of the transition branch of the first branch crosses zero, the load current is transferred to the third switch 207 and the current limiting element 212 of the transition branch of the second branch, and the fourth switch 208 of the transition branch of the second branch is turned on, as shown in fig. 9.
In S26, the current zero crossing of the current limiting element 212 of the transition branch of the second branch is determined by sampling the current transformer 232 of the second branch and the seventh current transformer 237 of the transition branch of the second branch, and after the load current is transferred to the fourth switch 208 of the transition branch of the second branch, the first switch 203 and the second switch 204 of the through-current branch of the second branch are turned on, and the fourth switch 208 of the transition branch of the second branch is turned off, as shown in fig. 10.
In S30, the load current is controlled to switch from one tap of the voltage regulating winding to another tap.
The load current is conducted from the current branch of the second branch of the switch 200 to the current branch of the first branch, and the operation steps are similar to the above process, and are not repeated.
According to the technical scheme, the digital electrical measurement technology is combined, the step control of the transient switching process of the on-load tap-changer can be realized, each step of action is monitored and can be protected, and the problem that the existing traditional tap-changer cannot stop once the action and cannot monitor and protect a black box is solved.
The above embodiments are only for illustrating the technical idea 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 idea of the present application falls within the protection scope of the present application.
Claims (12)
1. A split, step-wise on-load tap-changer comprising:
one end of the isolation module is arranged inside the transformer and is connected with the selection switch of the transformer, and the other end of the isolation module is arranged outside the transformer;
the change-over switch is arranged outside the transformer and is connected with the isolation module; the change-over switch is used for carrying out on-load switching operation according to the state of each branch switch and the current sampling of the corresponding current transformer;
the change-over switch includes two branches, every the branch road includes:
the current branch comprises a first switch and a second switch which are connected in series, and the transition branch comprises a third switch, a fourth switch and a current limiting element, wherein the fourth switch and the current limiting element are connected in parallel and then connected with the third switch in series;
the input ends of the two branches are respectively connected with the two output contacts of the selection switch through the isolation module, and the output ends of the two branches are connected;
the first current transformer is connected in series with one branch of the change-over switch;
the second current transformer is connected in series with the other branch of the change-over switch;
a fourth current transformer connected in series with the through-current branch of the one branch of the change-over switch;
a fifth current transformer connected in series with a through-current branch of the other branch of the change-over switch;
a sixth current transformer connected in series with a transition branch of said one branch of said change-over switch;
a seventh current transformer connected in series with a transition branch of the other branch of the change-over switch;
the change-over switch performs on-load switching operation according to the state of each branch switch and the current sampling of the current transformer:
the fourth current transformer or the fifth current transformer is used for sampling and judging current zero crossing, and determining that load current is transferred to a transition branch of the original conduction branch so as to switch off a fourth switch of the transition branch of the original conduction branch;
the sixth current transformer or the seventh current transformer is used for sampling and judging current zero crossing, and determining that load current is transferred to a current limiting element of a transition branch of an original conduction branch so as to conduct a third switch of the transition branch of the other branch;
the first current transformer and the second current transformer are used for sampling and judging respectively, and determining that a loop current exists in the voltage regulating winding of the transformer through the third switch and the current limiting element of the transition branch of the two branches, so that the third switch of the transition branch of the original conduction branch is turned off;
the first current transformer or the second current transformer is also used for sampling and judging the zero crossing of the third switch current of the transition branch of the original conduction branch, and determining the third switch and the current limiting element of the transition branch of the load current transferred to the other branch so as to conduct the fourth switch of the transition branch of the other branch;
the first current transformer and the sixth current transformer, or the second current transformer and the seventh current transformer are further used for sampling and judging zero crossing of the current limiting element current of the transition branch of the other branch, and after the load current is determined to be transferred to the fourth switch of the transition branch of the other branch, the first switch and the second switch of the through-flow branch of the other branch are conducted, and the fourth switch of the transition branch of the other branch is turned off.
2. The split, step-by-step on-load tap changer of claim 1, further comprising:
the selection switch is arranged inside the transformer and comprises n input contacts and n output contacts, and the n input contacts are connected with n taps of the voltage regulating winding of the transformer in a one-to-one correspondence manner.
3. The split-step on-load tap changer of claim 1, wherein the isolation module comprises:
the first isolation unit is connected between one output contact of the selection switch and the input end of one branch of the change-over switch;
and the second isolation unit is connected between the other output contact of the selection switch and the input end of the other branch of the change-over switch.
4. The split-step on-load tap changer of claim 1, wherein the diverter switch further comprises:
and the voltage limiting element is connected between the input ends of the two branches.
5. The split-step on-load tap changer of claim 4, wherein the voltage limiting element comprises: a nonlinear resistor.
6. The split-step on-load tap changer of claim 1, wherein the diverter switch further comprises:
and the third current transformer is connected in series with the output end of the change-over switch.
7. The split-step on-load tap changer of claim 1, wherein the change-over switch comprises a mechanical switch comprising at least one of an oil switch, a sulfur hexafluoride switch, a vacuum switch, or a power electronic switch comprising at least one of a silicon controlled rectifier, an insulated gate bipolar thyristor, an electron injection enhancement gate thyristor, an integrated gate commutated thyristor, a metal oxide semiconductor field effect thyristor.
8. The split-step on-load tap changer of claim 1, wherein the current limiting element comprises: resistance or/and reactance.
9. The split, step-up, on-load tap changer of claim 1, wherein the diverter switch is isolated from ground potential by an insulating support.
10. A method of controlling a split, step-by-step on-load tap changer according to any one of claims 1 to 9, comprising:
when the transformer carries out on-load voltage regulation, an output contact of a selection switch correspondingly connected with the other tap of the voltage regulation winding is controlled to be connected with the other through-flow branch of the change-over switch through an isolation module;
the control change-over switch performs on-load switching operation according to the state of each branch switch and current sampling;
the load current is controlled to switch from one tap of the voltage regulating winding to another.
11. The control method according to claim 10, further comprising:
under the normal working state, the load current of the control transformer flows through any tap of the voltage regulating winding, a selection switch connected with the tap, an isolation module and one branch of the change-over switch, and the rest branches of the change-over switch are in an off state.
12. The control method as claimed in claim 10, wherein the controlling the change-over switch performs the on-load switching operation according to the state of each branch switch and the current sampling, including:
closing a fourth switch of a transition branch of the original conduction branch, and switching off a first switch and a second switch of a through-flow branch of the original conduction branch;
sampling and judging the zero crossing of the current through a fourth current transformer or a fifth current transformer of the current through branch of the original conduction branch, transferring the load current to a transition branch of the original conduction branch, and switching off a fourth switch of the transition branch of the original conduction branch;
sampling and judging the zero crossing of the current through a sixth current transformer or a seventh current transformer of the transition branch of the original conduction branch, transferring the load current to a current limiting element of the transition branch of the original conduction branch, and conducting a third switch of the transition branch of the other branch;
the method comprises the steps of respectively sampling and judging through a first current transformer and a second current transformer of two branches, and turning off a third switch of a transition branch of an original conduction branch after a voltage regulating winding of a transformer has circulation through the third switch of the transition branch of the two branches and a current limiting element;
judging the zero crossing of the third switch current of the transition branch of the original conduction branch through sampling of the first current transformer or the second current transformer of the original conduction branch, transferring the load current to the third switch and the current limiting element of the transition branch of the other branch, and conducting the fourth switch of the transition branch of the other branch;
and after the current transformer of the other branch and the seventh current transformer or the sixth current transformer of the transition branch of the other branch are used for sampling and judging the zero crossing of the current limiting element current of the transition branch of the other branch, the load current is transferred to the fourth switch of the transition branch of the other branch, the first switch and the second switch of the through-flow branch of the other branch are turned on, and the fourth switch of the transition branch of the other branch is turned off.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229990A (en) * | 2016-09-08 | 2016-12-14 | 镇江世晟电气有限公司 | The load ratio bridging switch regulator of a kind of distribution transformer, system and method |
| 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 |
| CN112908652A (en) * | 2021-01-08 | 2021-06-04 | 南京南瑞继保电气有限公司 | On-load tap-changer and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103426657B (en) * | 2012-05-17 | 2016-03-30 | 上海华明电力设备制造有限公司 | Switching construction between a kind of tap selector moving contact and fixed contact |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229990A (en) * | 2016-09-08 | 2016-12-14 | 镇江世晟电气有限公司 | The load ratio bridging switch regulator of a kind of distribution transformer, system and method |
| 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 |
| CN112908652A (en) * | 2021-01-08 | 2021-06-04 | 南京南瑞继保电气有限公司 | On-load tap-changer and control method thereof |
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