CN201887713U - Reinforced excitation circuit for handling electric generator accidents - Google Patents
Reinforced excitation circuit for handling electric generator accidents Download PDFInfo
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- CN201887713U CN201887713U CN2010206774893U CN201020677489U CN201887713U CN 201887713 U CN201887713 U CN 201887713U CN 2010206774893 U CN2010206774893 U CN 2010206774893U CN 201020677489 U CN201020677489 U CN 201020677489U CN 201887713 U CN201887713 U CN 201887713U
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- excitation
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Abstract
The utility model relates to a reinforced excitation circuit for handling electric generator accidents. The secondary side of an exciting transformer is provided with a duplex winding respectively connected with a first rectifier and a second rectifier, wherein the first rectifier is connected in series with a first diode and a rotor winding, the second rectifier is connected in series with a second diode and the rotor winding, one end of the rotor winding is connected with the anode of the first diode, the other end is connected with the cathode of the second diode, and a thyristor switch is connected in series between the cathode of the first diode and the anode of the second diode. Through the novel structure of a main excitation circuit, the reinforced excitation circuit comprehensively optimizes the functional characteristics of the system, improves parameter characteristics under normal operational conditions, better achieves 99.99 percent safety, high efficiency, energy conservation, consumption reduction, and the like during the long-term running of the excitation system, and reduces the cost of high parameter excitation, thus being beneficial to the long-term stable running and endowing the electric generator with enough reinforced excitation capability for handling the accidents.
Description
Technical field
The utility model relates to a kind of synchronous generator accident forced exciting circuit, belongs to big-and-middle-sized synchronous generator stationary rectifier excitation system field.
Background technology
There is the parameter configuration height in conventional electric generators stationary rectifier excitation circuit, and utilization rate of equipment and installations is low, running wastage is big, a series of disadvantages such as overvoltage height during the thyristor commutation, and the actual accident that provides for generator is the ability of encouraging problem such as be difficult to meet design requirement by force.
Summary of the invention
The purpose of this utility model provides a kind of forced exciting circuit, solve field circuit parameter configuration height in the prior art, problems such as utilization rate of equipment and installations is low, running wastage is big, commutation overvoltage height, by structure optimization, realize the parallel running of rectifier power source and the flexibility conversion that series connection is encouraged by force to excitation system.
For solving the problems of the technologies described above, the purpose of this utility model is achieved in that a kind of generator accident forced exciting circuit, the excitation transformer secondary side is a double winding, double winding connects first rectifier, second rectifier respectively, first rectifier and first diode, rotor windings in series, second rectifier and second diode, rotor windings in series, rotor winding one end connects first diode anode, the other end connects second diode cathode, also is serially connected with thyristor switch between first diode cathode and second diode anode.
A kind of generator accident of the utility model forced exciting circuit adopts double-winding structure, to rectifier grouping power supply, and the thorough separation on the source, normal rectification moves two groups of rectifiers in the load end parallel connection, exports exciting current jointly; By encouraging change-over circuit by force, realize the mode of encouraging by force of voltage stack when needing accident to encourage by force.
The voltage superimposed type is encouraged circuit by force, guarantee to encourage by force for accident provide encourage ability by force in, promptly satisfy systematic failures less than 0.01% probability; Again by optimizing the functional structure of excitation main body circuit, cooperating excitation to become transforms, solved traditional field circuit parameter configuration height, a series of disadvantages such as utilization rate of equipment and installations is low, running wastage is big, commutation overvoltage height, and the reality ability of encouraging problem such as be difficult to meet design requirement by force.
Structure innovation by excitation main body circuit, comprehensively optimized the functional characteristic of system, improved the performance parameters under the normality service conditions, also fine when having solved the excitation system long-time running greater than 99.99% fail safe, high efficiency and problem such as energy-saving and cost-reducing, and reduced the cost of high parameter excitation arrangement, help operation steady in a long-term, and guarantee that the accident that provides enough encourages ability by force to generator.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is a structural representation of the present utility model.
Embodiment
A kind of generator accident forced exciting circuit, excitation transformer ZB secondary side is a double winding, double winding connects the first rectifier Z1, the second rectifier Z2 respectively, the first rectifier Z1 connects with the first diode V1, rotor winding L, the second rectifier Z2 connects with the second diode V2, rotor winding L, rotor winding L one end connects the first diode V1 anode, the other end connects the second diode V2 negative electrode, also be serially connected with thyristor switch QK between the first diode V1 negative electrode and the second diode V2 anode, as the executive component of encouraging action by force.
Normal operating condition:
Encourage switch S CR blocking-up by force, the first rectifier Z1 and second rectifier Z2 output in parallel, and can regulate and control the output current current-sharing respectively, because power supply is independent, current-sharing realizes being more prone to.
Exciting voltage UL=UZ1=UZ2 ULmax=1.3 ~ 1.5Ufn
If=I1+I2 Iqk=0
The excitation output voltage is rectifier voltage, and about a=50 ° of rectifier pilot angle can provide the adjusting range of 1.5Vfn, and rectification becomes secondary voltage only for having 60～70% of anode voltage now, and usage ratio of equipment significantly improves.
Accident is encouraged state by force:
Encourage switch S CR triggering and conducting by force, the first rectifier Z1 and the second rectifier Z2 are automatically converted to series system, then realize the state of encouraging by force of high limited value, field-forcing voltage ULq=UZ1+UZ2=(1.3 ~ 1.5) 2UZ.
Exciting current is begun to increase to encouraging the top value by force by Ifo=I1+I2, and its final value is by encouraging the electric current limit decision by force, and excitation output field-forcing voltage is that the first rectifier Z1 and the second rectifier Z2 voltage sum reach the more high-strength top value of encouraging.Encourage function operations by force and just switch realization by additional thyristor SCR switch QK.If encourage release by force, then cut off the triggering signal of the switch QK of thyristor SCR, make a certain group of rectifier inversion 10～20ms among the first rectifier Z1 and the second rectifier Z2 simultaneously, the switch QK of thyristor SCR is oppositely closed, field circuit is replied normal condition.
Claims (1)
1. generator accident forced exciting circuit, it is characterized in that: excitation transformer (ZB) secondary side is a double winding, double winding connects first rectifier (Z1) respectively, second rectifier (Z2), first rectifier (Z1) and first diode (V1), rotor winding (L) series connection, second rectifier (Z2) and second diode (V2), rotor winding (L) series connection, rotor winding (L) end connects first diode (V1) anode, the other end connects second diode (V2) negative electrode, also is serially connected with thyristor switch (QK) between first diode (V1) negative electrode and second diode (V2) anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206774893U CN201887713U (en) | 2010-12-24 | 2010-12-24 | Reinforced excitation circuit for handling electric generator accidents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206774893U CN201887713U (en) | 2010-12-24 | 2010-12-24 | Reinforced excitation circuit for handling electric generator accidents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201887713U true CN201887713U (en) | 2011-06-29 |
Family
ID=44185257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206774893U Expired - Lifetime CN201887713U (en) | 2010-12-24 | 2010-12-24 | Reinforced excitation circuit for handling electric generator accidents |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201887713U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064757A (en) * | 2010-12-24 | 2011-05-18 | 中国长江三峡集团公司 | Generator accident reinforced excitation circuit |
-
2010
- 2010-12-24 CN CN2010206774893U patent/CN201887713U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064757A (en) * | 2010-12-24 | 2011-05-18 | 中国长江三峡集团公司 | Generator accident reinforced excitation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110629 Effective date of abandoning: 20130227 |
|
| RGAV | Abandon patent right to avoid regrant |