CN110620372A - System for eliminating excitation inrush current of regional power grid - Google Patents
System for eliminating excitation inrush current of regional power grid Download PDFInfo
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- CN110620372A CN110620372A CN201810634446.8A CN201810634446A CN110620372A CN 110620372 A CN110620372 A CN 110620372A CN 201810634446 A CN201810634446 A CN 201810634446A CN 110620372 A CN110620372 A CN 110620372A
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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
- H02H7/28—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 meshed systems
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Abstract
The invention discloses a regional power grid excitation inrush current elimination system, which comprises a system side bus (300), a transformer (9) and an excitation bus, wherein the transformer (9) comprises a transformer high-voltage side (100) and a transformer low-voltage side (200), the system side bus (300) is electrically connected with the transformer high-voltage side (100), the excitation bus is electrically connected with the transformer low-voltage side (100), the excitation inrush current elimination system comprises a diesel generator (14), the diesel generator (14) is connected with the excitation bus and is connected in parallel to the transformer low-voltage side (200), and the transformer low-voltage side (200) is supplied with power through the diesel generator (14). The invention completely eliminates the influence of the excitation inrush current on the regional power grid when the transformer impacts, and perfectly solves the problem that the power grid system is paralyzed due to the excitation inrush current when the regional power grid impacts the high-capacity transformer.
Description
Technical Field
The invention relates to the field of power transmission and distribution, in particular to a system for eliminating excitation inrush current of a regional power grid.
Background
With the rapid development of industrial economy, industrial parks are built to bloom throughout. According to the power supply demand condition of an industrial park and considering the economic benefits of enterprises, the park adopts self-contained power plants to supply power, so that a micro-grid is formed, and the micro-grid is popularized and applied more and more widely in China.
Disclosure of Invention
The invention aims to provide a system for eliminating magnetizing inrush current of a regional power grid aiming at the defects in the prior art, which can eliminate the influence of the magnetizing inrush current on the system when a transformer impacts and perfectly solve the problem of system breakdown caused by the magnetizing inrush current when the regional power grid impacts a large-capacity transformer.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a regional electric wire netting excitation surge current elimination system, regional electric wire netting includes system side generating line, transformer and excitation generating line, the transformer includes transformer high pressure side and transformer low pressure side, system side generating line with transformer high pressure side electric property links to each other, the excitation generating line with transformer low pressure side electric property links to each other, excitation surge current elimination system includes diesel generator, diesel generator with the excitation generating line links to each other and connects in parallel at transformer low pressure side, transformer low pressure side passes through the diesel generator power supply.
In addition, the invention also provides the following auxiliary technical scheme: the diesel generator is connected with the excitation bus and connected to the low-voltage side of the transformer in parallel, a sixth circuit breaker is arranged between the diesel generator and the excitation bus, and electric power generated by the diesel generator is input or cut to the excitation bus through the sixth circuit breaker.
The rated voltage output by the diesel generator is the same as the rated voltage of the low-voltage side of the transformer.
And a fourth circuit breaker is arranged between the low-voltage side of the transformer and the excitation bus and used for controlling the electric power transmitted to the low-voltage side of the transformer through the excitation bus.
The regional power grid comprises a system side bus, and the system side bus is electrically connected with the high-voltage side of the transformer.
And a second circuit breaker and a sixth isolating switch are arranged between the high-voltage side of the transformer and the system side bus, and the second circuit breaker is used for inputting or cutting the electric power transmitted to the high-voltage side of the transformer by the system side bus.
A method for applying a regional power grid magnetizing inrush current eliminating system specifically comprises the following steps:
s1: providing: the high-voltage side of the transformer, the low-voltage side of the transformer, a second circuit breaker, a third circuit breaker and a fourth circuit breaker are arranged in a separated position.
S2: providing: and the sixth circuit breaker and the fourth circuit breaker at the low-voltage end of the transformer are sequentially closed before the diesel generator runs, so that the voltage at the low-voltage side of the transformer to be impacted is boosted from zero to a rated voltage, and the steady-state magnetic flux is slowly increased to eliminate the magnetizing inrush current.
S3: and after the voltage of the low-voltage side of the transformer rises to the rated voltage, the voltage of the high-voltage side of the transformer is equal to the voltage of the regional power grid, the second circuit breaker is closed, and the diesel power generation power supply and the regional power grid power supply are in parallel connection at the same time.
S4: after the diesel generator and the regional power grid are synchronously parallel, the power of the diesel generator is manually and slowly reduced to zero, a fourth circuit breaker on the low-voltage side of the transformer and a sixth circuit breaker on the output end of the diesel generator are sequentially separated, and the excitation inrush current elimination system is safely withdrawn.
Compared with the prior art, the invention has the advantages that: the diesel generator drives the transformer to start boosting from zero, the voltage of the high-voltage side of the transformer is equal to the voltage of a regional power grid system, and the power supply generated by the diesel generator and the power supply of the regional power grid are arranged in parallel at the same time, so that the full-voltage no-load switch-on of the transformer is avoided, and the influence of excitation inrush current on the system when the transformer impacts is completely eliminated.
Drawings
Fig. 1 is a schematic diagram of a regional power grid electrical system of the present invention.
Fig. 2 is a schematic diagram of the magnetizing inrush current eliminating system of the present invention connected to a power grid.
Fig. 3 is an enlarged view of a portion of the magnetizing inrush current elimination system of the present invention.
Detailed Description
The present invention will be described in further non-limiting detail with reference to the following preferred embodiments and accompanying drawings.
As shown in fig. 1, the electrical system of the regional power grid includes a tie line, a system-side bus 300 electrically connected to the tie line, and a transformer 9 electrically connected to the system-side bus, wherein a second breaker 7 and a sixth breaker 8 are disposed between a high-voltage side 100 of the transformer and the system-side bus 300 for controlling the power transmitted from the system-side bus 300 to the transformer 9, the electrical system of the regional power grid supplies power to a double bus, a first disconnector 1 and a first breaker 2 are disposed between the tie line and the system-side bus 300, a third disconnector 4 and a fourth disconnector 5 are disposed between the first system-side bus 301 and the second breaker 7, a second isolating switch 3 and a fifth isolating switch 6 are arranged between the second system side bus 302 and the second breaker 7, so that the two buses are mutually standby. The power is transmitted to the transformer 9 through the system side bus bar 300, the voltage of 220KV is reduced to 10KV through the transformer 9 to be used as service power, and the excitation bus bar is divided into a plurality of distribution branches according to actual needs to be used by electric appliances. The first and second tie lines are the same as the electrical components in connection, and the first tie line and the second tie line can achieve the desired purpose.
As shown in fig. 2 and fig. 3, the electrical system is equipped with a magnetizing inrush current eliminating system, the magnetizing inrush current eliminating system includes a diesel generator 14, the diesel generator 14 is connected to the magnetizing bus and is connected in parallel to the low-voltage side 200 of the transformer, specifically, the output end of the diesel generator 14 is connected to the magnetizing bus, a sixth circuit breaker 13 is arranged between the two circuit breakers and is used for controlling the electric power generated by the diesel generator 14 to be input into or cut off from the excitation bus, the diesel generator 14 generates electricity and then transmits the electricity to the excitation bus, the diesel generator 14 supplies power to the transformer low-voltage side 200, in addition, a fourth breaker 11 is arranged between the excitation bus and the transformer low-voltage side 200, when the excitation inrush current system is started integrally, the sixth circuit breaker 13 at the front end of the diesel generator 14 and the fourth circuit breaker 11 at the low-voltage side 200 of the transformer need to be closed, and the diesel generator 14 can drive the transformer 9 to be started integrally.
Further, the rated voltage output by the diesel generator 14 is the same as the rated voltage of the transformer low-voltage side 200, when the magnetizing inrush current eliminating system is used, the second breaker 7, the third breaker 10 and the fourth breaker 11 on the high-low voltage side of the transformer 9 are checked and confirmed to be in a separated position, the sixth disconnector 8 and the fourth disconnector 5 on the high-voltage side 100 of the transformer are well-balanced, the sixth breaker 13 at the outlet of the diesel generator 14 and the fourth breaker 11 on the low-voltage side 200 of the transformer are closed at the moment, the diesel generator comprises a controller (not shown), the diesel generator 14 is started through the controller, when the zero-rise voltage of the diesel generator 14 slowly rises to the rated voltage, the voltage inductively output by the high-voltage side 100 of the transformer also gradually rises to the rated voltage of the high-voltage side 100 of the transformer, and when the voltage on the high-voltage side 100 of the transformer is the high-voltage side rated voltage, the diesel generator 14, the voltage of the high-voltage side 100 of the transformer is equal to the voltage of a regional power grid system, the frequency of a power supply of the diesel generator 14 is ensured to be the same as the frequency of a power supply of the regional power grid by adjusting the rotating speed of the diesel generator 14, then the second circuit breaker 7 is closed, the diesel generator 14 and the regional power grid are in parallel in the same period, when the second circuit breaker 7 is closed, a steady magnetic field is established in a transformer iron core, the closing of the transformer 9 does not pass through a transient process, and no excitation inrush current is generated in. Finally, the diesel generator 14 is safely withdrawn, preferably, the power of the diesel generator 14 is slowly reduced manually, and finally reduced to zero. The fourth circuit breaker 11 on the low-voltage side 200 of the transformer and the sixth circuit breaker 13 on the output end of the diesel generator 14 are sequentially separated, so that the excitation inrush current elimination system is safely withdrawn, the regional power grid system normally supplies power to the transformer 9, the full-voltage no-load switching-on of the transformer 9 is avoided, and the transformer excitation bus can be connected with a load through the third circuit breaker 10.
The invention has the advantages that the diesel generator drives the transformer to start zero and boost, the induced output voltage of the high-voltage side of the transformer also gradually rises to the rated voltage, the voltage of the high-voltage side of the transformer is equal to the voltage of a regional power grid system, and then the power supply generated by the diesel generator and the power supply of the regional power grid are simultaneously arranged in parallel through the high-voltage side switch of the transformer, so that the full-voltage no-load switch-on of the transformer is avoided, the influence of the excitation inrush current on the system when the transformer impacts a large-capacity transformer is completely eliminated, and the problem of system paralysis caused by the excitation inrush current when the regional.
It should be noted that the above-mentioned preferred embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. The utility model provides a regional power grid excitation inrush current elimination system, regional power grid includes system side bus (300), transformer (9) and excitation bus, transformer (9) are including transformer high-pressure side (100) and transformer low-voltage side (200), system side bus (300) with transformer high-pressure side (100) electric connection, excitation bus with transformer low-voltage side (200) electric connection, its characterized in that: the excitation inrush current elimination system comprises a diesel generator (14), wherein the diesel generator (14) is connected with the excitation bus and is connected to a transformer low-voltage side (200) in parallel, and the transformer low-voltage side (200) is supplied with power through the diesel generator (14).
2. The regional power grid magnetizing inrush current cancellation system of claim 1, wherein: a sixth circuit breaker (13) is arranged between the diesel generator (14) and the excitation bus, and electric power generated by the diesel generator (14) is input or cut into the excitation bus through the sixth circuit breaker (13).
3. The regional power grid magnetizing inrush current cancellation system of claim 2, wherein: the rated voltage output by the diesel generator (14) is the same as the rated voltage of the low-voltage side (200) of the transformer.
4. The regional power grid magnetizing inrush current cancellation system of claim 1, wherein: and a fourth breaker (11) is arranged between the transformer low-voltage side (200) and the excitation bus and used for controlling the power transmitted to the transformer low-voltage side (200) through the excitation bus.
5. The regional power grid magnetizing inrush current cancellation system of claim 1, wherein: the regional power grid comprises a system side bus (300), and the system side bus (300) is electrically connected with the high-voltage side (100) of the transformer.
6. The regional power grid magnetizing inrush current cancellation system of claim 5, wherein: a second breaker (7) and a sixth disconnecting switch (8) are arranged between the high-voltage side (100) of the transformer and the system side bus (300), and the second breaker (7) is used for inputting or cutting off the power transmitted to the high-voltage side (100) of the transformer by the system side bus (300).
7. A method for applying a regional power grid magnetizing inrush current eliminating system is characterized by specifically comprising the following steps:
and (3) SI: providing: diesel generator (14), transformer high pressure side (100), transformer low pressure side (200), second circuit breaker (7), third circuit breaker (10) and fourth circuit breaker (11), before diesel generator (14) started, confirm second circuit breaker (7), third circuit breaker (10) and fourth circuit breaker (11) of transformer high pressure side (100, 200) are all in the branch position.
S2: providing: and the sixth circuit breaker (13) is closed in sequence before the diesel generator (14) runs, so that the voltage of the transformer low-voltage side (200) is boosted from zero to a rated voltage, and the steady-state magnetic flux is slowly increased to eliminate the magnetizing inrush current.
S3: after the voltage of the low-voltage side (200) of the transformer rises to the rated voltage, the voltage of the high-voltage side (100) of the transformer is equal to the voltage of the regional power grid, the second circuit breaker (7) is closed, and the power supply of the diesel generator (14) and the power supply of the regional power grid are connected in parallel at the same time.
S4: after the diesel generator (14) and the regional power grid are synchronously parallel, the power of the diesel generator (14) is manually and slowly reduced to zero, a fourth circuit breaker (11) on the low-voltage side (200) of the transformer and a sixth circuit breaker (13) on the output end of the diesel generator (14) are sequentially separated, and the excitation inrush current elimination system safely exits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810634446.8A CN110620372A (en) | 2018-06-20 | 2018-06-20 | System for eliminating excitation inrush current of regional power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810634446.8A CN110620372A (en) | 2018-06-20 | 2018-06-20 | System for eliminating excitation inrush current of regional power grid |
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| Publication Number | Publication Date |
|---|---|
| CN110620372A true CN110620372A (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810634446.8A Pending CN110620372A (en) | 2018-06-20 | 2018-06-20 | System for eliminating excitation inrush current of regional power grid |
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| Country | Link |
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| CN (1) | CN110620372A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362115A (en) * | 2021-12-31 | 2022-04-15 | 贵州电网有限责任公司 | Main transformer excitation-free inrush current commissioning method based on flexible power electronic switch |
| CN115036910A (en) * | 2022-05-12 | 2022-09-09 | 中核核电运行管理有限公司 | System and method for commissioning main transformer of nuclear power plant |
-
2018
- 2018-06-20 CN CN201810634446.8A patent/CN110620372A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362115A (en) * | 2021-12-31 | 2022-04-15 | 贵州电网有限责任公司 | Main transformer excitation-free inrush current commissioning method based on flexible power electronic switch |
| CN114362115B (en) * | 2021-12-31 | 2024-04-05 | 贵州电网有限责任公司 | Main transformer excitation-free inrush current operation method based on flexible power electronic switch |
| CN115036910A (en) * | 2022-05-12 | 2022-09-09 | 中核核电运行管理有限公司 | System and method for commissioning main transformer of nuclear power plant |
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