CN113765061A - Protection method for dragging stage of generator - Google Patents
Protection method for dragging stage of generator Download PDFInfo
- Publication number
- CN113765061A CN113765061A CN202111005354.1A CN202111005354A CN113765061A CN 113765061 A CN113765061 A CN 113765061A CN 202111005354 A CN202111005354 A CN 202111005354A CN 113765061 A CN113765061 A CN 113765061A
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- China
- Prior art keywords
- generator
- protection method
- starting device
- dragging
- fuse
- 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.)
- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002955 isolation Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
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
- H02H7/06—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 dynamo-electric generators; for synchronous capacitors
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a protection method for a generator in a dragging stage. The invention cuts off the fault point of the output end of the starting device and the outgoing cable thereof by additionally arranging the fuse, and the installation is convenient; the serious consequences caused by the frequency conversion starting device at the dragging stage and the fault of the outgoing cable of the frequency conversion starting device can be prevented by using lower investment cost; has good market prospect and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of variable frequency starting of a gas turbine power plant, and particularly relates to a starting device for protecting a generator in a dragging stage and a method for protecting an outgoing cable of the starting device.
Background
The generator in a gas turbine or a pumped storage power station needs to be dragged by using a frequency converter starting device as a synchronous motor, when the output end of the starting device and a cable of the starting device have short-circuit faults in the dragging stage, the generator can continuously provide short-circuit current for a fault point due to the existence of an excitation power supply and residual magnetism of the generator, the short-circuit current is larger due to the fact that the rotating speed of the generator is far lower than the rated rotating speed and the impedance value of a stator coil of the generator is lower, and equipment is extremely easy to damage when the short-circuit current is broken because a device for cutting off the short-circuit current is not arranged in a loop in the conventional configuration.
Therefore, it is an urgent need for those skilled in the art to solve the above problems by developing a mechanism or method capable of protecting the generator traction phase.
Disclosure of Invention
In order to solve the problems, the invention discloses a protection method for a dragging stage of a generator.
In order to achieve the purpose, the invention provides the following technical scheme:
a protection method for a generator in a dragging stage is characterized in that a fuse is additionally arranged behind an isolation knife switch.
Further, the specific method comprises the following steps: a group of fuses is added to each phase of an inlet of an SFC isolation switch blade of the generator outlet circuit breaker system GCB, and a fuse box is additionally arranged below the SFC isolation switch blade of the generator outlet circuit breaker system GCB.
Further, the number of fuses is at least 3.
A protection method for a generator in a dragging stage is used for protecting a variable frequency starting device and an outlet cable thereof.
Compared with the prior art, the invention has the following beneficial effects:
1. the output end of the starting device and a fault point of an outgoing cable of the starting device are cut off by additionally arranging the fuse, so that the starting device is convenient and fast to install;
2. the serious consequences caused by the frequency conversion starting device at the dragging stage and the fault of the outgoing cable of the frequency conversion starting device can be prevented by using lower investment cost;
3. has good market prospect and is suitable for popularization and application.
Drawings
Fig. 1, installation schematic of the invention.
List of reference numerals: 1. and a fuse.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
The embodiment is a protection method for a generator in a dragging stage, and the method is characterized in that a fuse is additionally arranged behind an isolation knife switch.
Fig. 1 shows a connection diagram of a variable frequency starting device of a generator of a current gas turbine power plant and an outgoing cable thereof, a maximum current of a fuse applied to a medium-voltage loop is 400A, a maximum current of a generator in a dragging stage exceeds 1000A, the embodiment is provided with more than 3 fuses 1, and the more than 3 fuses 1 are connected in parallel for use, so as to prevent the phenomenon that the fuses one by one are blown out during operation due to unbalanced shunting of the fuses 1.
During specific installation, a group of fuses 1 is added at each phase of an inlet of an SFC isolation switch blade of a generator outlet circuit breaker system GCB, and a fuse box is additionally arranged below the SFC isolation switch blade of the generator outlet circuit breaker system GCB; and for safety consideration when the fuse is replaced, the auxiliary contact of the fuse needs to simultaneously lock the isolation knife switch in the GCB and the switch-on of the isolation high voltage side switch.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (4)
1. A protection method for a generator dragging stage is characterized by comprising the following steps: the method is to install a fuse after the isolating knife switch.
2. The generator dragging phase protection method according to claim 1, characterized in that: the specific method comprises the following steps: a group of fuses is added to each phase of an inlet of an SFC isolation switch blade of the generator outlet circuit breaker system GCB, and a fuse box is additionally arranged below the SFC isolation switch blade of the generator outlet circuit breaker system GCB.
3. The generator dragging phase protection method according to claim 2, characterized in that: the number of fuses is at least 3.
4. A protection method for a generator dragging stage is used for protecting a variable frequency starting device and an outgoing cable thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005354.1A CN113765061A (en) | 2021-08-30 | 2021-08-30 | Protection method for dragging stage of generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005354.1A CN113765061A (en) | 2021-08-30 | 2021-08-30 | Protection method for dragging stage of generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113765061A true CN113765061A (en) | 2021-12-07 |
Family
ID=78791807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111005354.1A Pending CN113765061A (en) | 2021-08-30 | 2021-08-30 | Protection method for dragging stage of generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113765061A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2269663Y (en) * | 1994-07-25 | 1997-12-03 | 王川 | Short circuit protective device for plant varied transformation or excited transformation |
| JP2000262097A (en) * | 1999-03-10 | 2000-09-22 | Hitachi Ltd | AC generator operation protection device |
| JP2002044859A (en) * | 2000-07-24 | 2002-02-08 | Mitsubishi Electric Corp | Overexcitation protection device of generator |
| US20090322083A1 (en) * | 2008-06-30 | 2009-12-31 | General Electric Company | Optimizing converter protection for wind turbine generators |
| CN111477523A (en) * | 2020-04-14 | 2020-07-31 | 阳光电源股份有限公司 | Combined fuse, application device thereof and protection method of application device |
| JP2020178506A (en) * | 2019-04-22 | 2020-10-29 | 東芝三菱電機産業システム株式会社 | Power conversion device |
-
2021
- 2021-08-30 CN CN202111005354.1A patent/CN113765061A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2269663Y (en) * | 1994-07-25 | 1997-12-03 | 王川 | Short circuit protective device for plant varied transformation or excited transformation |
| JP2000262097A (en) * | 1999-03-10 | 2000-09-22 | Hitachi Ltd | AC generator operation protection device |
| JP2002044859A (en) * | 2000-07-24 | 2002-02-08 | Mitsubishi Electric Corp | Overexcitation protection device of generator |
| US20090322083A1 (en) * | 2008-06-30 | 2009-12-31 | General Electric Company | Optimizing converter protection for wind turbine generators |
| JP2020178506A (en) * | 2019-04-22 | 2020-10-29 | 東芝三菱電機産業システム株式会社 | Power conversion device |
| CN111477523A (en) * | 2020-04-14 | 2020-07-31 | 阳光电源股份有限公司 | Combined fuse, application device thereof and protection method of application device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211207 |
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| RJ01 | Rejection of invention patent application after publication |