CN116266498A - Switching circuit for vacuum on-load tap-changer and control method - Google Patents
Switching circuit for vacuum on-load tap-changer and control method Download PDFInfo
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- CN116266498A CN116266498A CN202211406517.1A CN202211406517A CN116266498A CN 116266498 A CN116266498 A CN 116266498A CN 202211406517 A CN202211406517 A CN 202211406517A CN 116266498 A CN116266498 A CN 116266498A
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- 238000010079 rubber tapping Methods 0.000 claims abstract description 49
- 230000007704 transition Effects 0.000 claims abstract description 19
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- 238000012546 transfer Methods 0.000 claims abstract description 7
- 230000007935 neutral effect Effects 0.000 claims description 26
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- 238000013461 design Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
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- 238000012986 modification Methods 0.000 description 4
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- 238000012545 processing Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a switching circuit and a control method for a vacuum on-load tap-changer, and belongs to the technical field of tap-changers. The switching circuit of the present invention includes: a main through-flow switch M1, a main through-flow switch M2, a transfer switch T, a vacuum circuit breaker V1, a vacuum circuit breaker V2, a vacuum circuit breaker V3 and a transition resistor R. The switching circuit of the invention has symmetrical time sequence of the time sequence from the N tapping side to the N+1 tapping side and the time sequence from the N+1 tapping side to the N tapping side, thereby greatly simplifying the difficulty of mechanical design. And the symmetrical time sequence is adopted, and meanwhile, the single transition resistor design is adopted, so that the manufacturing cost of the switch can be saved. The task of switching through and cutting off the current in the switching process is borne by the three vacuum circuit breakers V1, V2 and V3, and the switching task of the vacuum bubbles is shared and balanced.
Description
Technical Field
The present invention relates to the field of tap changers, and more particularly, to a switching circuit and a control method for a vacuum on-load tap changer.
Background
When the on-load tap-changer performs on-load voltage regulation, an arc can be generated between the moving contact and the fixed contact. The arc can ablate the contact, and meanwhile, the transformer oil can be decomposed, so that the insulation performance of the transformer oil is greatly reduced. As one of the on-load tap-changer, the vacuum on-load tap-changer mainly uses the vacuum tube of the change-over switch to realize the extinction of the electric arc, so that the electric arc and the hot gas are not exposed. The oil in the tapping switch oil chamber can not be carbonized and polluted, the oil does not need to be purified, and the burning corrosion of the contact in the vacuum tube can be reduced to the minimum.
The prior on-load tap-changer switching core has asymmetric time sequence of switching from an odd tap to an even tap and from an even tap to an odd tap, so that two sets of mechanical driving components (cams or sheaves) are needed for two times of switching, and when the switching is repeated, rail changing operation is needed to be executed, and the switch structure is complex.
Disclosure of Invention
In view of the above problems, the present invention provides a switching circuit for a vacuum on-load tap-changer, comprising: a main through-flow switch M1, a main through-flow switch M2, a transfer switch T, a vacuum circuit breaker V1, a vacuum circuit breaker V2, a vacuum circuit breaker V3 and a transition resistor R;
the main switch M1 is connected with the N tapping side of the switching circuit and the neutral point of the transformer;
the main switch M2 is connected with the N+1 tapping side of the switching circuit and the neutral point of the transformer;
the fixed end of the change-over switch T is connected with a neutral point of the transformer, and an action arm of the change-over switch T is switched between the main switch M1 and the main switch M2;
the vacuum circuit breaker V1 is connected with the fixed end T1 of the change-over switch T and one end of the vacuum circuit breaker V3 and is connected with the excessive resistor R in parallel;
the vacuum circuit breaker V2 is connected with the fixed end T2 of the change-over switch T and the N+1 tapping side of the switching circuit and is connected with the main switch M2 in parallel;
the transition resistor R is connected with one end of the vacuum circuit breaker V3 and the fixed end T3 of the change-over switch;
the gear of the on-load tap-changer is switched between an N tap side and an N+1 tap side of the switching circuit.
Optionally, the timings of switching from the N tap side to the n+1 tap side and the timings of switching from the n+1 tap side to the N tap side are symmetrical timings in the transition of the switching circuit.
Optionally, when the gear of the on-load tap-changer is at the N tap-changer side of the switching circuit, the main switch M1 is turned on, the main switch M2 is turned off, the moving contact of the action arm of the change-over switch T is connected with the fixed end T1, the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are turned on, and the vacuum circuit breaker V2 is turned off, at this time, the load current at the N tap-changer side of the switching circuit is output to the neutral point of the transformer through the main switch M1 and the change-over switch T.
Optionally, when the gear of the on-load tap-changer is switched from the N tap side of the switching circuit to the n+1 tap side of the switching circuit, the operation process includes:
1. the main switch M1 is opened, the movable contact of the action arm of the change-over switch T is simultaneously connected with the fixed end T1 and the fixed end T2, the vacuum circuit breaker V1 is opened, and the vacuum circuit breaker V2 is closed;
2. the main switch M2 is closed, the vacuum circuit breaker V3 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T2, and the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed.
Optionally, when the gear of the on-load tap-changer is located at the n+1 tap-changer side of the switching circuit, the main switch M2 is turned on, the main switch M1 is turned off, the moving contact of the action arm of the change-over switch T is connected with the fixed end T2, the vacuum circuit breaker V1, the vacuum circuit breaker V2 and the vacuum circuit breaker V3 are turned on, and at this time, the load current at the n+1 tap-changer side of the switching circuit is output to the transformer neutral point through the main switch M2 and the change-over switch T.
The invention also provides a control method of the switching circuit for the vacuum on-load tap-changer, which comprises the following steps:
when the gear of the on-load tapping switch needs to be connected with the N+1 tapping side of the switching circuit, the main switch M2 is closed, the main switch M1 is opened, the movable contact of the action arm of the change-over switch T is connected with the fixed end T2, the vacuum circuit breaker V1, and the vacuum circuit breaker V2 and the vacuum circuit breaker V3 are closed;
when the gear of the on-load tapping switch needs to be connected with the N tapping side of the switching circuit, the main switch M1 is closed, the main switch M2 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T1, the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed, and the vacuum circuit breaker V2 is opened.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a switching circuit for a vacuum on-load tap-changer, comprising: a main through-flow switch M1, a main through-flow switch M2, a transfer switch T, a vacuum circuit breaker V1, a vacuum circuit breaker V2, a vacuum circuit breaker V3 and a transition resistor R; the main switch M1 is connected with the N tapping side of the switching circuit and the neutral point of the transformer; the main switch M2 is connected with the N+1 tapping side of the switching circuit and the neutral point of the transformer; the fixed end of the change-over switch T is connected with a neutral point of the transformer, and an action arm of the change-over switch T is switched between the main switch M1 and the main switch M2; the vacuum circuit breaker V1 is connected with the fixed end T1 of the change-over switch T and one end of the vacuum circuit breaker V3 and is connected with the excessive resistor R in parallel; the vacuum circuit breaker V2 is connected with the fixed end T2 of the change-over switch T and the N+1 tapping side of the switching circuit and is connected with the main switch M2 in parallel; the transition resistor R is connected with one end of the vacuum circuit breaker V3 and the fixed end T3 of the change-over switch; the gear of the on-load tap-changer is switched between an N tap side and an N+1 tap side of the switching circuit. The switching circuit of the invention has symmetrical time sequence of the time sequence from the N tapping side to the N+1 tapping side and the time sequence from the N+1 tapping side to the N tapping side, thereby greatly simplifying the difficulty of mechanical design. And the symmetrical time sequence is adopted, and meanwhile, the single transition resistor design is adopted, so that the manufacturing cost of the switch can be saved. The task of switching through and cutting off the current in the switching process is borne by the three vacuum circuit breakers V1, V2 and V3, and the switching task of the vacuum bubbles is shared and balanced.
Drawings
FIG. 1 is a schematic diagram of a switching circuit according to the present invention
FIGS. 2a-h are schematic diagrams of the present invention transitioning from the N tap side to the N+1 tap side;
FIG. 3 is a schematic diagram of the present invention on the n+1 tap side;
FIG. 4 is a timing diagram illustrating a transition from the N-tap side to the N+1-tap side according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a switching circuit for a vacuum on-load tap-changer, as shown in fig. 1, comprising: a main through-flow switch M1, a main through-flow switch M2, a transfer switch T, a vacuum circuit breaker V1, a vacuum circuit breaker V2, a vacuum circuit breaker V3 and a transition resistor R;
the main switch M1 is connected with the N tapping side of the switching circuit and the neutral point of the transformer;
the main switch M2 is connected with the N+1 tapping side of the switching circuit and the neutral point of the transformer;
the fixed end of the change-over switch T is connected with a neutral point of the transformer, and an action arm of the change-over switch T is switched between the main switch M1 and the main switch M2;
the vacuum circuit breaker V1 is connected with the fixed end T1 of the change-over switch T and one end of the vacuum circuit breaker V3 and is connected with the excessive resistor R in parallel;
the vacuum circuit breaker V2 is connected with the fixed end T2 of the change-over switch T and the N+1 tapping side of the switching circuit and is connected with the main switch M2 in parallel;
the transition resistor R is connected with one end of the vacuum circuit breaker V3 and the fixed end T3 of the change-over switch;
the gear of the on-load tap-changer is switched between an N tap side and an N+1 tap side of the switching circuit.
In the transient process of the switching circuit, the time sequence from the N tapping side to the N+1 tapping side and the time sequence from the N+1 tapping side to the N tapping side are symmetrical time sequences.
When the gear of the on-load tap-changer is at the N tap-changer side of the switching circuit, the main switch M1 is closed, the main switch M2 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T1, the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed, and the vacuum circuit breaker V2 is opened, at this time, the load current at the N tap-changer side of the switching circuit is output to the neutral point of the transformer through the main switch M1 and the change-over switch T.
The operating process includes:
1. the main switch M1 is opened, the movable contact of the action arm of the change-over switch T is simultaneously connected with the fixed end T1 and the fixed end T2, the vacuum circuit breaker V1 is opened, and the vacuum circuit breaker V2 is closed;
2. the main switch M2 is closed, the vacuum circuit breaker V3 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T2, and the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed.
When the gear of the on-load tap-changer is at the n+1 tap-changer side of the switching circuit, the main switch M2 is closed, the main switch M1 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T2, the vacuum circuit breaker V1, the vacuum circuit breaker V2 and the vacuum circuit breaker V3 are closed, and at this time, the load current at the n+1 tap-changer side of the switching circuit is output to the neutral point of the transformer through the main switch M2 and the change-over switch T.
As shown in fig. 1, when the gear of the on-load tap-changer is in N tap, the main switch M1 is turned on, the switch M2 is turned off, the moving contact of the action arm of the change-over switch T is connected with the switch M1, the vacuum circuit breakers V1 and V3 are turned on, and the vacuum circuit breaker V2 is turned off, and at this time, the N tap-side load current is output to the neutral point of the transformer through the main switch M1 and the change-over switch T.
When the tapping switch is switched from the N tapping side to the N+1 tapping side, the operation steps of the transition circuit comprise:
as shown in fig. 1 and 2a, the main switch M1 is turned off, and at this time, the N-tap side load current flows through the transfer switch T and the current breakers V1 and V3 to be output to the neutral point of the transformer;
as shown in fig. 1 and 2b, the action arm of the change-over switch T is operated to connect the T moving contact and the two stationary contacts at the same time, and at this time, the N-tap side load current is output to the neutral point of the transformer through the change-over switch T and the current breakers V1 and V3;
as shown in fig. 1 and 2c, the vacuum interrupter V1 is opened. At the moment, N tapping side load current flows through a vacuum circuit breaker V3 and a transition resistor R to a neutral point of a transformer;
as shown in fig. 1 and 2d, the vacuum circuit breaker V2 is closed. The transition circuit then connects the N-tap side and the n+1-tap side simultaneously, forming a bridge, generating a circulating current ic=us/R, at which time the load current is transferred from the N-tap side to the n+1-tap side. Wherein the US is an on-load tap-changer stage voltage;
as shown in fig. 1 and 2e, the main switch M2 is closed. At this time, the load current at the n+1 tapping side is output to the neutral point of the transformer through the main switch M2, the N tapping side and the n+1 tapping side are still bridged, and the circulating current IC still exists;
as shown in fig. 1 and 2f, the vacuum interrupter V3 is opened. At the moment, the bridge connection between the N tapping side and the N+1 tapping side is disconnected, the connection between the N tapping side and the neutral point is also disconnected, and the load current on the N+1 side flows through the main switch M2 and is output to the neutral point of the transformer;
as shown in fig. 1 and 2g, the operation arm of the change-over switch T is operated so that the T moving contact is connected to the main switch M2 side fixed contact. At this time, the current flow is not changed;
as shown in fig. 1 and 2h, the vacuum circuit breakers V1 and V3 are closed. At this point, the current flow is unchanged, closing the circuit breakers V1 and V3 ready for the next switching task.
As shown in fig. 3, when the gear of the on-load tap-changer is in the n+1 tap, the main switch M2 is closed, the main switch M1 is opened, the moving contact of the action arm of the transfer switch T is connected with the M2 tap, the vacuum circuit breakers V1, V2 and V3 are closed, and at this time, the n+1 tap-side load current is output to the transformer neutral point through the main switch M2.
The switching from the n+1 tap to the N tap is the same in principle and similar in process, and will not be described again here.
When the tap selector switches from the N tap to the n+1 tap, the transition circuit switching timing diagram is shown in fig. 4.
The invention also provides a control method of the switching circuit for the vacuum on-load tap-changer, which comprises the following steps:
and 2, when the gear of the on-load tapping switch needs to be connected with the N tapping side of the switching circuit, the main switch M1 is closed, the main switch M2 is opened, the movable contact of the action arm of the change-over switch T is connected with the fixed end T1, the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed, and the vacuum circuit breaker V2 is opened.
Compared with the prior art, the invention has the beneficial effects that:
the switching circuit of the invention has symmetrical time sequence of the time sequence from the N tapping side to the N+1 tapping side and the time sequence from the N+1 tapping side to the N tapping side, thereby greatly simplifying the difficulty of mechanical design. And the symmetrical time sequence is adopted, and meanwhile, the single transition resistor design is adopted, so that the manufacturing cost of the switch can be saved. The task of switching through and cutting off the current in the switching process is borne by the three vacuum circuit breakers V1, V2 and V3, and the switching task of the vacuum bubbles is shared and balanced.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. A switching circuit for a vacuum on-load tap-changer, the switching circuit comprising: a main through-flow switch M1, a main through-flow switch M2, a transfer switch T, a vacuum circuit breaker V1, a vacuum circuit breaker V2, a vacuum circuit breaker V3 and a transition resistor R;
the main switch M1 is connected with the N tapping side of the switching circuit and the neutral point of the transformer;
the main switch M2 is connected with the N+1 tapping side of the switching circuit and the neutral point of the transformer;
the fixed end of the change-over switch T is connected with a neutral point of the transformer, and an action arm of the change-over switch T is switched between the main switch M1 and the main switch M2;
the vacuum circuit breaker V1 is connected with the fixed end T1 of the change-over switch T and one end of the vacuum circuit breaker V3 and is connected with the excessive resistor R in parallel;
the vacuum circuit breaker V2 is connected with the fixed end T2 of the change-over switch T and the N+1 tapping side of the switching circuit and is connected with the main switch M2 in parallel;
the transition resistor R is connected with one end of the vacuum circuit breaker V3 and the fixed end T3 of the change-over switch;
the gear of the on-load tap-changer is switched between an N tap side and an N+1 tap side of the switching circuit.
2. The switching circuit of claim 1 wherein the timings of switching from the N tap side to the n+1 tap side and the timings of switching from the n+1 tap side to the N tap side during the transition of the switching circuit are symmetrical timings.
3. The switching circuit according to claim 1, wherein when the gear of the on-load tap-changer is located at the N-tap side of the switching circuit, the main switch M1 is closed, the main switch M2 is opened, the moving contact of the action arm of the change-over switch T is connected to the fixed end T1, the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed, and the vacuum circuit breaker V2 is opened, and at this time, the load current at the N-tap side of the switching circuit is output to the transformer neutral point through the main switch M1 and the change-over switch T.
4. The switching circuit of claim 1, wherein the on-load tap changer has a gear that is tapped by the switching circuit N to the n+1 tap of the switching circuit, and wherein the operating process comprises:
1. the main switch M1 is opened, the movable contact of the action arm of the change-over switch T is simultaneously connected with the fixed end T1 and the fixed end T2, the vacuum circuit breaker V1 is opened, and the vacuum circuit breaker V2 is closed;
2. the main switch M2 is closed, the vacuum circuit breaker V3 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T2, and the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed.
5. The switching circuit according to claim 1, wherein when the gear of the on-load tap-changer is located at the n+1 tap-changer side of the switching circuit, the main switch M2 is closed, the main switch M1 is opened, the moving contact of the action arm of the change-over switch T is connected to the fixed end T2, the vacuum circuit breaker V1, the vacuum circuit breaker V2 and the vacuum circuit breaker V3 are closed, and at this time, the load current at the n+1 tap-changer side of the switching circuit is output to the transformer neutral point through the main switch M2 and the change-over switch T.
6. A method of controlling a switching circuit for a vacuum on-load tap-changer, the method comprising:
when the gear of the on-load tapping switch needs to be connected with the N+1 tapping side of the switching circuit, the main switch M2 is closed, the main switch M1 is opened, the movable contact of the action arm of the change-over switch T is connected with the fixed end T2, the vacuum circuit breaker V1, and the vacuum circuit breaker V2 and the vacuum circuit breaker V3 are closed;
when the gear of the on-load tapping switch needs to be connected with the N tapping side of the switching circuit, the main switch M1 is closed, the main switch M2 is opened, the moving contact of the action arm of the change-over switch T is connected with the fixed end T1, the vacuum circuit breaker V1 and the vacuum circuit breaker V3 are closed, and the vacuum circuit breaker V2 is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406517.1A CN116266498A (en) | 2022-11-10 | 2022-11-10 | Switching circuit for vacuum on-load tap-changer and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406517.1A CN116266498A (en) | 2022-11-10 | 2022-11-10 | Switching circuit for vacuum on-load tap-changer and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116266498A true CN116266498A (en) | 2023-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211406517.1A Pending CN116266498A (en) | 2022-11-10 | 2022-11-10 | Switching circuit for vacuum on-load tap-changer and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116266498A (en) |
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2022
- 2022-11-10 CN CN202211406517.1A patent/CN116266498A/en active Pending
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