CN110880749A - Overvoltage device for limiting direct current breaker to ground - Google Patents
Overvoltage device for limiting direct current breaker to ground Download PDFInfo
- Publication number
- CN110880749A CN110880749A CN201911060978.6A CN201911060978A CN110880749A CN 110880749 A CN110880749 A CN 110880749A CN 201911060978 A CN201911060978 A CN 201911060978A CN 110880749 A CN110880749 A CN 110880749A
- Authority
- CN
- China
- Prior art keywords
- switch
- direct current
- lightning arrester
- ground
- circuit breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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]
Abstract
The invention belongs to the technical field of multi-terminal flexible direct current power transmission and distribution, and particularly relates to an overvoltage limiting device of a direct current circuit breaker to the ground. The system comprises a bypass lightning arrester and a quick closing switch, wherein one end of the bypass lightning arrester is electrically connected with a direct current line, and the other end of the bypass lightning arrester is electrically connected with one end of the quick closing switch; the other end of the rapid closing switch is grounded. In the invention, when the mechanical switch is switched off, the thyristor on the transfer branch is triggered, the capacitor voltage is instantly added to the main branch cable, the voltage is instantly increased, the rapid switch-on switch is switched on after 4ms, and the bypass lightning arrester acts to instantly reduce the line voltage to the rated voltage range. The invention uses the characteristic of the bypass lightning arrester to quickly reduce the voltage, and the used quick closing switch has simple structure and low cost, thereby ensuring the insulation of the line cable.
Description
Technical Field
The invention belongs to the technical field of multi-terminal flexible direct current power transmission and distribution, and particularly relates to an overvoltage limiting device of a direct current circuit breaker to the ground.
Background
With the rapid development of a power grid, a multi-end flexible direct-current power transmission and distribution technology is applied, a direct-current circuit breaker plays a role in grid connection and fault removal among converter valves, the scheme of the direct-current circuit breaker applied at present is divided into a hybrid type and a mechanical type, the on-off principle of the two schemes is different, the mechanical type needs RC oscillation when being switched on and off, but C voltage can be added to a direct-current line when no-load brake is switched off, the C voltage is superposed with voltage on the line and exceeds the cable phase-to-phase insulation level, so that the cable phase-to-phase insulation fault is caused, and the system is powered.
Disclosure of Invention
The invention provides a device for limiting overvoltage to the ground for a direct current circuit breaker, which aims to overcome the defects in the prior art and ensures that the line voltage is controlled within an allowable range when the circuit breaker acts.
In order to solve the technical problems, the invention adopts the technical scheme that: the device for limiting overvoltage to the ground of the direct current circuit breaker comprises a bypass lightning arrester and a quick closing switch, wherein one end of the bypass lightning arrester is electrically connected with a direct current line, and the other end of the bypass lightning arrester is electrically connected with one end of the quick closing switch; the other end of the rapid closing switch is grounded.
The direct current circuit breaker is characterized by further comprising a quick mechanical switch, a reactor, a capacitor and a thyristor, wherein the quick mechanical switch is installed on the direct current circuit and connected with the bypass lightning arrester and the quick closing switch in series, and the reactor, the capacitor and the thyristor are connected in series in sequence and then connected with the quick mechanical switch in parallel.
Furthermore, the energy-absorbing lightning arrester also comprises an energy-absorbing lightning arrester, and the energy-absorbing lightning arrester is connected with the quick mechanical switch in parallel.
Preferably, the bypass lightning arrester is a zinc oxide bypass lightning arrester. The zinc oxide valve plate of the zinc oxide bypass lightning arrester has excellent nonlinear volt-ampere characteristics, when overvoltage invades, the current flowing through the valve plate is rapidly increased, the amplitude of the overvoltage is limited, the energy of the overvoltage is released, the overvoltage of a line is reduced, and the reliable operation of a direct current line is ensured.
Preferably, the bypass lightning arrester adopts a low residual voltage ratio, and the residual voltage is 1.2 times of the rated voltage.
Preferably, the quick closing switch adopts a vacuum arc-extinguishing chamber. The quick switch-on switch adopts a vacuum arc extinguish chamber, and has strong through-current capability and long mechanical life.
Preferably, the mechanism of the quick closing switch adopts a permanent magnet mechanism.
Preferably, the closing time of the rapid closing switch is less than or equal to 20ms, and the opening time is less than or equal to 20 ms.
Preferably, the quick closing switch delays the operation of the mechanical dc breaker by 4 ms. When the mechanical switch is switched off, a thyristor on the transfer branch is triggered, the capacitor voltage is instantly added to the main branch cable, the voltage is instantly increased, the rapid switch-on switch is switched on after 4ms, and the bypass lightning arrester acts to instantly reduce the line voltage to the rated voltage range.
Preferably, the quick closing switch performs one closing and opening operation after the mechanical direct current breaker opens, and the closing and opening interval time is 300 ms.
Compared with the prior art, the beneficial effects are:
1. in the invention, when the mechanical switch is switched off, the thyristor on the transfer branch is triggered, the capacitor voltage is instantly added to the main branch cable, the voltage is instantly increased, the rapid switch-on switch is switched on after 4ms, and the bypass lightning arrester acts to instantly reduce the line voltage to the rated voltage range.
2. The invention uses the characteristic of the bypass lightning arrester to quickly reduce the voltage, and the used quick closing switch has simple structure and low cost, thereby ensuring the insulation of the line cable.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
Example 1:
as shown in fig. 1, an overvoltage limiting device for a dc circuit breaker to ground includes a bypass arrester 1 and a fast switch-on switch 2, wherein one end of the bypass arrester 1 is electrically connected to a dc line 3, and the other end is electrically connected to one end of the fast switch-on switch 2; the other end of the quick closing switch 2 is grounded.
Further, the energy-absorbing energy-saving device also comprises a quick mechanical switch 4, a reactor 5, a capacitor 6, a thyristor 7 and an energy-absorbing arrester 8, wherein the quick mechanical switch 4 is installed on the direct current line 3 and is connected with the bypass arrester 1 and the quick closing switch 2 in series, and the reactor 5, the capacitor 6 and the thyristor 7 are connected in series in sequence and then are connected with the quick mechanical switch 4 in parallel; the energy-absorbing lightning arrester 8 is connected in parallel with the fast mechanical switch 4.
In this embodiment, the bypass lightning arrester 1 is a zinc oxide bypass lightning arrester 1. The zinc oxide valve plate of the zinc oxide bypass lightning arrester 1 has excellent nonlinear volt-ampere characteristics, when overvoltage invades, the current flowing through the valve plate is rapidly increased, the amplitude of the overvoltage is limited, the energy of the overvoltage is released, the overvoltage of a line is reduced, and the reliable operation of the direct current line 3 is ensured.
The bypass lightning arrester 1 adopts a low residual voltage ratio, and the residual voltage is 1.2 times of rated voltage.
In addition, the rapid closing switch 2 adopts a vacuum arc-extinguishing chamber. The rapid switch-on switch 2 adopts a vacuum arc extinguish chamber, and has strong through-current capability and long mechanical life.
In some embodiments, the mechanism of the quick closing switch 2 adopts a permanent magnet mechanism; the closing time of the rapid closing switch 2 is less than or equal to 20ms, and the opening time is less than or equal to 20 ms.
In this embodiment, the quick closing switch 2 delays the operation of the mechanical dc breaker by 4 ms. The rapid closing switch 2 performs one closing and opening operation after the mechanical direct current breaker opens, and the closing and opening interval time is 300 ms.
In the invention, when the mechanical switch is switched off, the thyristor 7 on the transfer branch is triggered, the capacitor voltage is instantly added to the main branch cable, the voltage is instantly increased, the rapid switch-on switch 2 is switched on after 4ms, the bypass lightning arrester 1 acts, and the line voltage is instantly reduced to the rated voltage range. The invention uses the characteristic of the bypass lightning arrester 1 to quickly reduce the voltage, and the used quick closing switch 2 has simple structure and low cost, thereby ensuring the insulation of the direct current line 3.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The overvoltage limiting device for the direct current circuit breaker to be grounded is characterized by comprising a bypass lightning arrester (1) and a quick switch-on switch (2), wherein one end of the bypass lightning arrester (1) is electrically connected with a direct current line (3), and the other end of the bypass lightning arrester is electrically connected with one end of the quick switch-on switch (2); the other end of the rapid closing switch (2) is grounded.
2. The direct current circuit breaker overvoltage limiting device to ground according to claim 1, characterized by further comprising a fast mechanical switch (4), a reactor (5), a capacitor (6) and a thyristor (7), wherein the fast mechanical switch (4) is installed on the direct current line (3) and is connected in series with the bypass arrester (1) and the fast closing switch (2); the reactor (5), the capacitor (6) and the thyristor (7) are sequentially connected in series and then are connected with the quick mechanical switch (4) in parallel.
3. A device for limiting overvoltage to ground of a direct current circuit breaker according to claim 3, characterized in that it further comprises an energy absorbing arrester (8), said energy absorbing arrester (8) being connected in parallel with the fast mechanical switch (4).
4. A device for limiting overvoltage to ground of a direct current breaker according to claim 3 is characterized in that the bypass lightning arrester (1) adopts zinc oxide bypass lightning arrester (1).
5. The device for limiting overvoltage to ground of a direct current circuit breaker according to claim 4 is characterized in that the bypass lightning arrester (1) adopts a low residual voltage ratio, and the residual voltage is 1.2 times of rated voltage.
6. Device for limiting overvoltage to ground according to claim 4 characterized in that said quick closing switch (2) uses a vacuum interrupter.
7. Device for limiting overvoltage to ground for DC circuit breaker according to claim 6 characterized in that the mechanism of the quick closing switch (2) is a permanent magnet mechanism.
8. The device for limiting overvoltage to ground of a direct current breaker as claimed in claim 6, characterized in that the closing time of the fast closing switch (2) is less than or equal to 20ms, and the opening time is less than or equal to 20 ms.
9. The apparatus for limiting overvoltage to ground of a dc circuit breaker according to claim 8, characterized in that the quick closing switch (2) delays the mechanical dc circuit breaker action by a delay time of 4 ms.
10. The device for limiting overvoltage to ground of a direct current circuit breaker as claimed in claim 8, characterized in that the quick closing switch (2) will perform a switching on/off operation after the mechanical direct current circuit breaker is switched off, and the switching on/off interval is 300 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911060978.6A CN110880749A (en) | 2019-11-01 | 2019-11-01 | Overvoltage device for limiting direct current breaker to ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911060978.6A CN110880749A (en) | 2019-11-01 | 2019-11-01 | Overvoltage device for limiting direct current breaker to ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110880749A true CN110880749A (en) | 2020-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911060978.6A Pending CN110880749A (en) | 2019-11-01 | 2019-11-01 | Overvoltage device for limiting direct current breaker to ground |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110880749A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111640603A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Direct current switch device |
| CN111641152A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Breaker handcart with bypass and operation method |
| CN111640602A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method |
| CN113690862A (en) * | 2021-08-23 | 2021-11-23 | 广东电网有限责任公司 | Device and method for eliminating overvoltage in flexible direct current system |
-
2019
- 2019-11-01 CN CN201911060978.6A patent/CN110880749A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111640603A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Direct current switch device |
| CN111641152A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Breaker handcart with bypass and operation method |
| CN111640602A (en) * | 2020-05-06 | 2020-09-08 | 许继集团有限公司 | Multi-fracture direct-current switch equipment with controllable transfer branch oscillation current and control method |
| CN111640603B (en) * | 2020-05-06 | 2023-05-16 | 许继集团有限公司 | DC switch device |
| CN113690862A (en) * | 2021-08-23 | 2021-11-23 | 广东电网有限责任公司 | Device and method for eliminating overvoltage in flexible direct current system |
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