CN113690858B - Quick switch control protection system based on current limiting device - Google Patents
Quick switch control protection system based on current limiting device Download PDFInfo
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- CN113690858B CN113690858B CN202110837888.4A CN202110837888A CN113690858B CN 113690858 B CN113690858 B CN 113690858B CN 202110837888 A CN202110837888 A CN 202110837888A CN 113690858 B CN113690858 B CN 113690858B
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- bus
- fault monitor
- fault
- electrically connected
- breaker
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- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims description 44
- 230000007246 mechanism Effects 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
Classifications
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
-
- 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
-
- 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
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a rapid switch control protection system based on a current limiting device, which comprises a spare power automatic switching device arranged on a segmented bus, a first fault monitor for monitoring No. 1 main transformer fault information and a first fault monitor for monitoring No. 2 main transformer fault information, wherein the spare power automatic switching device is used for switching the spare power automatic switching device to the first fault monitor; the generator set is connected with the I section bus and the II section bus respectively through a split reactor, the No. 1 main transformer is connected with the I section bus through a first breaker, the No. 2 main transformer is connected with the II section bus through a second breaker, the spare power automatic switching device is connected with a first fault monitor and a second fault monitor respectively, the split reactor is electrically connected with the I section bus through a third breaker, the split reactor is electrically connected with the II section bus through a fourth breaker, and the third fault monitor and the fourth fault monitor are electrically connected with the spare power automatic switching device respectively. A switching device is adopted to dynamically change the topological structure of the system during faults so as to limit short-circuit current, and a fast switch with strong robustness is designed for guaranteeing the operation safety of a bus.
Description
Technical Field
The invention relates to the technical field of power system safety, in particular to a rapid switch control protection system based on a current limiting device.
Background
With the rapid development of the power grid in China, the power grid scale is increasingly increased, and the short-circuit current level in the power system in China is increased year by year. Excessive short-circuit current meetings are detrimental to the safe and stable operation of the power system and to the electrical equipment itself. In order to ensure the safe operation of the power system, the electrical equipment in the power grid must be reinforced or replaced to solve the problem caused by the exceeding of short-circuit current, which can lead to the great improvement of the investment and technical requirements of the system on the electrical equipment, and the situation that no suitable breaker is selected can occur due to the limitation of the breaking capacity of the breaker. Therefore, to avoid a series of damage caused by exceeding the short-circuit current, how to limit the short-circuit current level within the safety margin has become a problem that has to be solved in the development process of the current generation power grid. At present, the exceeding of short-circuit current becomes one of main contradictions restricting the development of Zhejiang power grid and the safe operation of the power grid.
The traditional measure of reducing the short-circuit current of the system by changing the structure of the system is relatively simple to implement, and only needs to adjust the wiring of the system, but has relatively large influence on the normal operation of the system; in the process of circuit switching, due to instability of fault current, damage to a breaker is easy, once the breaker switch is out of control, great hidden danger is brought to operation safety of a power system, impact of short-circuit current is reduced through a series reactor or a fast switch is additionally arranged in front of the breaker, then the fast switch is used as a switching device, damage to an electrical accident is also easy to occur, the existing fast switch is used as a switching element, and emergency response capability to the accident is insufficient.
Disclosure of Invention
The invention aims to solve the potential safety hazard problem when a power system needs to perform line switching in the case of short circuit fault, and provides a rapid switch control protection system based on a current limiting device.
In order to achieve the technical aim, the invention provides a rapid switch control protection system based on a current limiting device, which comprises a spare power automatic switching device arranged on a segmented bus, a first fault monitor for monitoring No. 1 main transformer fault information and a first fault monitor for monitoring No. 2 main transformer fault information; the generator set is connected with the I section bus and the II section bus respectively through a split reactor, the No. 1 main transformer is connected with the I section bus through a first breaker, the No. 2 main transformer is connected with the II section bus through a second breaker, the spare power automatic switching device is connected with a first fault monitor and a second fault monitor respectively, the split reactor is electrically connected with the I section bus through a third breaker, the split reactor is electrically connected with the II section bus through a fourth breaker, the third fault monitor is used for monitoring fault information of the third breaker, the fourth fault monitor is used for monitoring fault information of the fourth breaker, and the third fault monitor and the fourth fault monitor are electrically connected with the spare power automatic switching device respectively.
Preferably, the standby automatic switching device comprises a bus isolation breaker, a main control module, a relay module, a power module and a current transformer, wherein the power module is electrically connected with the main control module, the two sides of the bus isolation breaker are respectively provided with a fast switch, the current transformer is connected with the fast switch, a reactor is arranged in parallel with the fast switch, and when the fast switch is disconnected, the reactor is in linkage and is connected with the bus in series; the main control module is electrically connected with the bus isolation circuit breaker through the relay module, and is respectively connected with the two quick switches through the current transformer; the main control module is electrically connected with the first fault monitor, the second fault monitor, the third fault monitor and the fourth fault monitor respectively.
Preferably, the quick switch comprises an isolation cavity and an electromagnetic cavity, wherein a magnet in the electromagnetic cavity extends to a distance from the bottom end of the isolation cavity to the inside of the isolation cavity, a switch mechanism and symmetrically arranged static contacts are arranged in the isolation cavity, the switch mechanism and the electromagnet are in linkage, and one end of each static contact extends to the outer end of the isolation cavity to serve as an electric connector.
Preferably, the switch mechanism comprises a support column, an upper spring, a lower spring, a slider, a left support arm, a right support arm and a moving contact which is respectively arranged at the end parts of the left support arm and the right support arm, wherein the lower end of the support column is fixed at the end part of a magnet, the upper end of the support column is fixed at the top part of the isolation cavity, the slider is sleeved on the support column, the upper spring and the lower spring are respectively sleeved on the support column, one end of the upper spring is fixedly connected with the slider, the other end of the upper spring is fixed at the top part of the isolation cavity, one end of the lower spring is fixedly connected with the slider, and the other end of the lower spring is fixed at the end part of the magnet.
Preferably, a magnet is arranged in the electromagnetic cavity, one end of the magnet extends to a distance in the isolation cavity, wires are uniformly wound on the magnet, two ends of the wires are respectively electrically connected with a converter through an interface, and the converter is electrically connected with the main control module.
Preferably, an iron block is arranged at the lower end of the sliding block, a shielding layer is arranged on the upper end face of the sliding block, and a wire is arranged in the shielding layer.
Preferably, the left support arm and the right support arm have the same structure, the left support arm is formed by connecting a flexible elastic sheet and a rigid sheet, the flexible elastic sheets are respectively arranged at two ends of the sliding block, the end parts of the rigid sheet are provided with the moving contacts, the two moving contacts are communicated through wires in the shielding layer, the flexible elastic sheet can ensure that the moving contacts are attached to the fixed contacts, and the flexible elastic sheet can accept certain buffering, so that the service life of the quick switch is prolonged.
Preferably, the isolating cavity is filled with arc extinguishing gas.
In the scheme, when the short-circuit current of the bus isolation circuit breaker is overlarge, the fast switch is opened, the control module controls the fast switch to be opened and closed through the converter, and meanwhile, after the reactor linked with the fast switch is connected into the bus in series, the effect of limiting the short-circuit current is achieved, the bus isolation circuit breaker is closed again, and the fault of the bus isolation circuit breaker can be avoided; the isolating cavity of the fast switch is filled with a breaker, so that arc benefits caused by short-circuit current can be well restrained.
The invention has the beneficial effects that: the invention provides a quick switch control protection system based on a current limiting device, wherein a spare automatic switching device is arranged on a bus, so that the topology conversion of the power transformation line can be carried out aiming at the fault of the power transformation line, meanwhile, in order to ensure the operation safety of the bus, a linkage device of a quick switch and a reactor is arranged, when the short-circuit current on the bus is too large to damage a bus sectionalizing breaker, the quick switch is opened, the reactor linked by the quick switch is connected into the bus in series, the function of limiting the short-circuit current is achieved, the bus isolation breaker is closed again, the fault of the bus isolation breaker can be avoided, and the operation safety of the bus is further ensured by designing the quick switch with strong robustness.
Drawings
Fig. 1 is a topology structure diagram of a fast switch control protection system based on a current limiting device according to the present invention.
Fig. 2 is a block diagram of a fast switch according to the present invention.
The figure indicates: 1-spare power automatic switching device, 2-split reactor, 3-generating set, 4-first circuit breaker, 5-second circuit breaker, 6-third circuit breaker, 7-fourth circuit breaker, 11-main control module, 12-converter, 41-first fault monitor, 51-second fault monitor, 61-third fault monitor, 71-fourth fault monitor, 81-electromagnetic cavity, 82-isolation cavity, 83-magnet, 84-support column, 85-slider, 86-left support arm, 87-right support arm, 88-movable contact, 89-stationary contact.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples, it being understood that the detailed description herein is merely a preferred embodiment of the present invention, which is intended to illustrate the present invention, and not to limit the scope of the invention, as all other embodiments obtained by those skilled in the art without making any inventive effort fall within the scope of the present invention.
Examples: as shown in fig. 1, the topology structure diagram of the fast switch control protection system based on the current limiting device comprises a spare power automatic switching device 1 arranged on a segmented bus, a first fault monitor 41 for monitoring the fault information of the primary transformer No. 1, and a first fault monitor for monitoring the fault information of the primary transformer No. 2; the generator set 3 is connected with the I section bus and the II section bus respectively through the split reactor 2, the No. 1 main transformer is connected with the I section bus through the first breaker 4, the No. 2 main transformer is connected with the II section bus through the second breaker 5, the spare power automatic switching device is connected with the first fault monitor and the second fault monitor 51 respectively, the split reactor is electrically connected with the I section bus through the third breaker 6, the split reactor is electrically connected with the II section bus through the fourth breaker 7, the third fault monitor 61 is used for monitoring the fault information of the third breaker, the fourth fault monitor 71 is used for monitoring the fault information of the fourth breaker, and the third fault monitor and the fourth fault monitor are electrically connected with the spare power automatic switching device respectively.
The standby automatic switching device comprises a bus isolation breaker, a main control module 11, a relay module (not shown), a power module (not shown) and a converter 12, wherein the power module is electrically connected with the main control module, two sides of the bus isolation breaker are respectively provided with a fast switch, the converter is connected with the fast switch, a reactor is connected with the fast switch in parallel, and when the fast switch is disconnected, the reactor is connected in parallel, and the reactor is connected with the bus in series; the main control module is electrically connected with the bus isolation circuit breaker through the relay module, and is respectively connected with the two quick switches through the current transformer; the main control module is electrically connected with the first fault monitor, the second fault monitor, the third fault monitor and the fourth fault monitor respectively.
The quick switch comprises an isolation cavity 82 and an electromagnetic cavity 81, wherein a magnet 83 in the electromagnetic cavity extends to a distance from the bottom end of the isolation cavity to the inside of the isolation cavity, a switch mechanism and symmetrically arranged static contacts 89 are arranged in the isolation cavity, the switch mechanism and the electromagnet are in linkage, one end of each static contact extends to the outer end of the isolation cavity to serve as an electric connector, arc extinguishing gas is overflowed in the isolation cavity, and the arc extinguishing gas is sulfur hexafluoride.
The switch mechanism comprises a support column 84, an upper spring (not shown), a lower spring (not shown), a sliding block 85, a left support arm 86, a right support arm 87 and a moving contact 88 respectively arranged at the end parts of the left support arm and the right support arm, wherein the lower end of the support column is fixed at the end part of a magnet, the upper end of the support column is fixed at the top part of an isolation cavity, the sliding block is sleeved on the support column, the upper spring and the lower spring are respectively sleeved on the support column, one end of the upper spring is fixedly connected with the sliding block, the other end of the upper spring is fixed at the top part of the isolation cavity, one end of the lower spring is fixedly connected with the sliding block, and the other end of the lower spring is fixed at the end part of the magnet.
The electromagnetic cavity is internally provided with a magnet, one end of the magnet extends to a distance in the isolation cavity, wires are uniformly wound on the magnet, two ends of the wires are respectively electrically connected with a current transformer through interfaces, and the current transformer is electrically connected with a main control module.
The lower extreme of slider is provided with the iron plate, the up end of slider is provided with the shielding layer, there is the wire in the shielding layer.
The structure of the left support arm is the same as that of the right support arm, the left support arm is formed by connecting a flexible elastic sheet and a rigid sheet, the flexible elastic sheets are respectively arranged at two ends of the sliding block, the end parts of the rigid sheet are provided with the moving contacts, the two moving contacts are communicated through wires in the shielding layer, the flexible elastic sheet can ensure that the moving contacts are attached to the fixed contacts, and the flexible elastic sheet can accept certain buffering, so that the service life of the quick switch is prolonged.
When the short-circuit current of the bus isolation circuit breaker is overlarge, the fast switch is opened, the control module controls the fast switch to be opened through the current transformer, meanwhile, after the reactor linked with the fast switch is connected into the bus in series, the effect of limiting the short-circuit current is achieved, the bus isolation circuit breaker is closed again, and the fault of the bus isolation circuit breaker can be avoided; the isolating cavity of the fast switch is filled with a breaker, so that arc benefits caused by short-circuit current can be well restrained.
The above embodiments are preferred embodiments of the fast switch control protection system based on the current limiting device according to the present invention, and are not limited to the specific embodiments, but the scope of the present invention includes equivalent changes of shape and structure according to the present invention.
Claims (5)
1. The rapid switch control protection system based on the current limiting device is characterized by comprising a spare power automatic switching device arranged on a segmented bus, a first fault monitor for monitoring No. 1 main transformer fault information and a first fault monitor for monitoring No. 2 main transformer fault information; the power generation unit is respectively connected with the section I bus and the section II bus through split reactors, the main transformer No. 1 is connected with the section I bus through a first circuit breaker, the main transformer No. 2 is connected with the section II bus through a second circuit breaker, the spare power automatic switching device is respectively connected with a first fault monitor and a second fault monitor, the split reactors are electrically connected with the section I bus through a third circuit breaker, the split reactors are electrically connected with the section II bus through a fourth circuit breaker, the third fault monitor is used for monitoring fault information of the third circuit breaker, the fourth fault monitor is used for monitoring fault information of the fourth circuit breaker, and the third fault monitor and the fourth fault monitor are respectively electrically connected with the spare power automatic switching device;
The standby automatic switching device comprises a bus isolation breaker, a main control module, a relay module, a power module and a converter, wherein the power module is electrically connected with the main control module, two sides of the bus isolation breaker are respectively provided with a fast switch, a reactor is connected with the fast switch in parallel, and when the fast switch is disconnected, the reactor is connected with the bus in a linkage way; the main control module is electrically connected with the bus isolation circuit breaker through the relay module, and is respectively connected with the two quick switches through the current transformer; the main control module is electrically connected with the first fault monitor, the second fault monitor, the third fault monitor and the fourth fault monitor respectively;
The quick switch comprises an isolation cavity and an electromagnetic cavity, wherein a magnet in the electromagnetic cavity extends from the bottom end of the isolation cavity to the inside of the isolation cavity for a certain distance, a switch mechanism and symmetrically arranged static contacts are arranged in the isolation cavity, the switch mechanism is in linkage with the electromagnet, and one end of each static contact extends to the outer end of the isolation cavity to serve as an electric connector;
The switch mechanism comprises a support column, an upper spring, a lower spring, a sliding block, a left support arm, a right support arm and a moving contact which is respectively arranged at the end parts of the left support arm and the right support arm, wherein the lower end of the support column is fixed at the end part of a magnet, the upper end of the support column is fixed at the top part of an isolation cavity, the sliding block is sleeved on the support column, the upper spring and the lower spring are respectively sleeved on the support column, one end of the upper spring is fixedly connected with the sliding block, the other end of the upper spring is fixed at the top part of the isolation cavity, one end of the lower spring is fixedly connected with the sliding block, and the other end of the lower spring is fixed at the end part of the magnet.
2. The rapid switch control protection system based on the current limiting device according to claim 1, wherein a magnet is arranged in the electromagnetic cavity, one end of the magnet extends to a distance in the isolation cavity, wires are uniformly wound on the magnet, two ends of the wires are respectively electrically connected with a current transformer through an interface, and the current transformer is electrically connected with the main control module.
3. The current limiting device-based rapid switch control protection system according to claim 1, wherein an iron block is arranged at the lower end of the sliding block, a shielding layer is arranged at the upper end face of the sliding block, and wires are arranged in the shielding layer.
4. The rapid switch control protection system based on a current limiting device according to claim 1 or 3, wherein the left support arm and the right support arm have the same structure, the left support arm is formed by connecting a flexible elastic sheet and a rigid sheet, the flexible elastic sheet is respectively arranged at two ends of the sliding block, the end part of the rigid sheet is provided with the moving contact, and the two moving contacts are communicated through a wire in the shielding layer.
5. The current limiting device based fast switch control protection system according to claim 1, wherein the isolation chamber is filled with arc suppressing gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110837888.4A CN113690858B (en) | 2021-07-23 | 2021-07-23 | Quick switch control protection system based on current limiting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110837888.4A CN113690858B (en) | 2021-07-23 | 2021-07-23 | Quick switch control protection system based on current limiting device |
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| Publication Number | Publication Date |
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| CN113690858A CN113690858A (en) | 2021-11-23 |
| CN113690858B true CN113690858B (en) | 2024-08-06 |
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| CN202110837888.4A Active CN113690858B (en) | 2021-07-23 | 2021-07-23 | Quick switch control protection system based on current limiting device |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202721440U (en) * | 2012-08-28 | 2013-02-06 | 合肥贝阿益电力设备有限公司 | Zero loss current device deeply restricting short trouble |
| CN103972866A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Locking method for preventing motor from being switched into short-circuit fault |
| CN104539043B (en) * | 2015-01-22 | 2017-03-08 | 江苏省电力公司扬州供电公司 | A kind of automatic switching device of standby power supply system haul oneself willingly into method |
| CN108051706B (en) * | 2017-12-28 | 2020-09-01 | 长园深瑞继保自动化有限公司 | Fault identification method and system for automatic standby power supply switching device |
| CN210957782U (en) * | 2019-11-06 | 2020-07-07 | 南京理工大学 | 35kV transformer substation sectional bus system based on mixed superconducting current limiter |
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2021
- 2021-07-23 CN CN202110837888.4A patent/CN113690858B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 限制电站和变电所中的短路电流的接线方案;林玮;《福建建设科技》;20080131(第1期);第48-50页 * |
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