CN202190057U - Generator grounding protective device - Google Patents
Generator grounding protective device Download PDFInfo
- Publication number
- CN202190057U CN202190057U CN2011202678158U CN201120267815U CN202190057U CN 202190057 U CN202190057 U CN 202190057U CN 2011202678158 U CN2011202678158 U CN 2011202678158U CN 201120267815 U CN201120267815 U CN 201120267815U CN 202190057 U CN202190057 U CN 202190057U
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- China
- Prior art keywords
- generator
- master control
- protective device
- grounding
- protection
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- Expired - Fee Related
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- Protection Of Generators And Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The utility model discloses a generator grounding protective device. The purpose is to provide a generator grounding protective device with a comprehensive protection function and high security. The generator grounding protective device provided in the utility model includes a master control device, a time-delay circuit device and a programmable logical device. The master control device, the time-delay circuit device and the programmable logical device are connected in sequence. The generator grounding protective device also includes a protective device and a grounding resistance calculation device. A grounding resistance acquisition device is respectively connected with the protective device and the master control device, the grounding resistance acquisition device is used for acquiring and calculating the grounding resistance data in the protective device, and feeding the data back to the master control device, whether the generator has a grounding fault can be determined, the master control device provides a corresponding instruction, and the generator is protected in real time comprehensively. In the utility model, the generator grounding protective device can be widely applied in the generator grounding protection field.
Description
Technical field
The utility model relates to a kind of generator protection for earthing device.
Background technology
Generator is the important component part in the Mechatronic Systems; Generator is as the electromechanical equipment of key; The safe operation of generator plays an important role to the operate as normal of Mechatronic Systems, it is carried out necessary safeguard measure also seem extremely important, lacks effective protective device in the existing generator system; When stator or rotor ground fault fault appear in generator; Fail promptly and accurately judgement and generator made protection, judgement and protection in the time of can not solving generator unit stator 100% earth fault, thereby safe and reliable operation that can't the full-scope safeguards gen-set.
The utility model content
The utility model technical problem to be solved is the deficiency that overcomes prior art, and a kind of comprehensive, safe generator protection for earthing device of protecting is provided.
The technical scheme that the utility model adopted is: the utility model comprises master control set, delay circuit device, programmable logic device; Said master control set, delay circuit device, programmable logic device connect successively; Said generator protection for earthing device comprises that also protective device and earth resistance calculate device; Said earth resistance harvester is connected with said protective device, said master control set respectively; Said earth resistance harvester is used for gathering and calculating the earth resistance data of said protective device and feed back in the said master control set, judges that whether generator earth fault takes place, and makes command adapted thereto by said main control unit.
The utility model also comprises the excitation harvester; Said exciting voltage harvester is connected with said protective device, said master control set respectively; Said exciting voltage harvester is used for gathering and calculating the exciting voltage of said protective device, and feeds back in the said master control set.
The utility model also comprises the earth point harvester; Said earth point harvester is connected with said protective device, said master control set respectively; Earthing position data when said earth point harvester is used to gather with calculating generator generation ground connection also feed back to said master control set, judge whether to be 2 ground connection.
The utility model comprises that also information shows and transmitting device that said information demonstration and transmitting device are connected with said delay circuit device, and said information shows and transmitting device is used to show or send the relevant information that said master control set provides.
The beneficial effect of the utility model is: in the utility model; Comprise that also protective device and earth resistance calculate device; Said earth resistance harvester is connected with said protective device, said master control set respectively, utilizes said earth resistance harvester that the earth resistance data in the said protective device are gathered and calculated and feed back in the said master control set, judges according to the data that drawn whether generator earth fault takes place; Make command adapted thereto by said main control unit again; Thereby make generator obtain real-time guard, the utility model is to the generator of big-and-middle-sized capacity, when it stator or rotor ground fault fault occur; Judgement that can be is promptly and accurately also made protection to generator, thereby accomplished the safe and reliable operation of full-scope safeguards gen-set.
Description of drawings
Fig. 1 is the circuit structure block diagram of the utility model embodiment one;
Fig. 2 is the circuit structure block diagram of the utility model embodiment two;
Fig. 3 is the circuit structure block diagram of the utility model embodiment three;
Fig. 4 is the circuit theory diagrams of the said protective device of the utility model.
Embodiment
As shown in Figure 1; The utility model comprises master control set, delay circuit device, programmable logic device; Said master control set, delay circuit device, programmable logic device connect successively; Said generator protection for earthing device comprises that also protective device and earth resistance calculate device, and said earth resistance harvester is connected with said protective device, said master control set respectively, and said earth resistance harvester is used for gathering and calculating the earth resistance data of said protective device and feeds back in the said master control set; Judge whether generator earth fault takes place; Make command adapted thereto by said main control unit, and send instruction to said programmable logic device, to make the protection action or to send signal through said delay circuit device; More than each the device in circuit theory be the mature technology of this area, in the utility model, obtain integrated application.
The generator stator ground protection should be satisfied following three basic demands: (1) current in the fault point should not surpass safe current, and outlet voltage 18KV and above generator safe current are 1A.(2) 100% protection zone is arranged.(3) the time protection of any point generation earth fault should have enough sensitivity in the protection zone.When the generator single phase ground fault, different neutral grounding modes will have different earth currents and dynamic overvoltage and different protection outlet mode.The big unit that 100MW is above; The general generator neutral point that adopts is through the grounding through arc mode; The arc suppression coil of the generator neutral point that connects for the unit in order to reduce the influence to the generator neutral point displacement voltage of couple transmission overvoltage and frequency variation, generally adopts the undercompensation mode; Thereby prevented that effectively earth fault from developing into alternate or turn-to-turn short circuit, fault point electric arc life period is greatly reduced.100% stator ground fault protection that is made up of jointly 3U0 stator ground fault protection and 3W stator ground fault protection is then adopted in protection.Wherein, The residual voltage size of 3U0 stator ground fault protection reaction machine, protection has the triple-frequency harmonics filtering function, and sensitivity is very high; Residual voltage is taken from the open-delta winding of generator machine end PT, and protection range is from the stator winding of machine end to tail side 85% ~ 95%.The generator stator ground protection scheme adopts generator neutral end zero sequence overvoltage and machine end 3 subharmonic and neutral point 3 subharmonic differential pressure overvoltage to constitute 100% stator ground fault protection.
The generator rotor ground protection is directed against from the shunt excitation system, and rotor is a direct current system, is connected with external dc power through slip ring, and the rotor winding has insulation protection, and does not have getting in touch of electricity between rotor.If one point earth is arranged, explain that the rotor winding insulation has destruction, winding contacts with rotor, and this situation possibly cause that generator damages, and should shut down and overhaul.So rotor one-point grounding protection is set.Protection is adopted with table tennis (switching) sampling type principle; The circuit theory diagrams of the said protective device of the utility model are as shown in Figure 4, and Rg is a rotor ground resistance among the figure, and S1, S2 are device internal electron switch.Protection has two measurement states:
A, S1 closure are state 1 when S2 opens;
B, S2 closure are state 2 when S1 opens;
Said protective device is to measuring under two states, and the different leakage currents that obtain through calculating earth resistance Rg, through comparing with the grounding resistance of adjusting, if less than setting value, then are judged to the rotor one-point grounding protection action.Same passing through calculated, and can obtain earth point positional information α, and the α value is calculated as follows:
α=U+/E×100%
The utility model can solve the dead-time problem of generator unit stator protection; Promptly broken through the protection range of original stator 95% protection range even lower 30% and 40%; Realize the logic decision and the protection of stator 100% earth fault, thus basic solution the potential problem of stator generation earth fault.
Embodiment two:
As shown in Figure 2; In the present embodiment, said generator protection for earthing device also comprises the excitation harvester, and said exciting voltage harvester is connected with said protective device, said master control set respectively; Said exciting voltage harvester is used for gathering and calculating the exciting voltage of said protective device; And feed back in the said master control set, table tennis (switching) sampling type principle has solved the dead-time problem of former electrical bridge principle, has also considered the influence of exciting voltage fluctuation to grounding resistance measurement simultaneously.Too big for fear of the too low error of calculation that causes of exciting voltage, when exciting voltage was lower than 20V, device withdrawed from rotor one-point grounding protection automatically.
Embodiment three:
As shown in Figure 3; In the present embodiment; Said generator protection for earthing device also comprises the earth point harvester; Said earth point harvester is connected with said protective device, said master control set respectively, and the earthing position data when said earth point harvester is used to gather with calculating generator generation ground connection also feed back to said master control set, judge whether to be 2 ground connection.
After judging the rotor one point earth, the sustainable calculating earth point of new departure position alpha, when finding that variation has taken place earth point, and changing value exceeds 2 ground connection definite values of rotor, and time-delay is judged to 2 ground connection of rotor., 2 ground connection of rotor can produce destructive damage when taking place to rotor; Because 2 ground protections of rotor are in exit status at ordinary times; After the rotor one point earth took place, destructive damage did not take place with 2 ground protections of automatic input rotor to ensure rotor in the utility model.The utility model is considered from the contingent actual ground connection situation of generator amature; The rotor ground fault fault is decomposed into one point earth and 2 ground connection; And the fault characteristic of distinguishing one point earth and 2 ground connection reaches the damaged situation to rotor; Targetedly one point earth and 2 earth faults have been carried out principle analysis and logic decision and processing, thus more careful solution the failure problems of rotor ground fault.
The utility model comprises that also information shows and transmitting device that said information demonstration and transmitting device are connected with said delay circuit device, and said information shows and transmitting device is used to show or send the relevant information that said master control set provides.
The utility model can be widely used in the generator protection for earthing field.
Claims (4)
1. generator protection for earthing device; It comprises master control set, delay circuit device, programmable logic device; Said master control set, delay circuit device, programmable logic device connect successively; It is characterized in that: said generator protection for earthing device comprises that also protective device and earth resistance calculate device, and said earth resistance harvester is connected with said protective device, said master control set respectively.
2. generator protection for earthing device according to claim 1 is characterized in that: it also comprises the exciting voltage harvester, and said exciting voltage harvester is connected with said protective device, said master control set respectively.
3. generator protection for earthing device according to claim 1 is characterized in that: it also comprises the earth point harvester, and said earth point harvester is connected with said protective device, said master control set respectively.
4. according to claim 1 or 2 or 3 described generator protection for earthing devices, it is characterized in that: it comprises that also information shows and transmitting device that said information demonstration and transmitting device are connected with said delay circuit device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202678158U CN202190057U (en) | 2011-07-27 | 2011-07-27 | Generator grounding protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202678158U CN202190057U (en) | 2011-07-27 | 2011-07-27 | Generator grounding protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202190057U true CN202190057U (en) | 2012-04-11 |
Family
ID=45921491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202678158U Expired - Fee Related CN202190057U (en) | 2011-07-27 | 2011-07-27 | Generator grounding protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202190057U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215867A (en) * | 2013-05-30 | 2014-12-17 | 南京南瑞继保电气有限公司 | Online recognition method for single-phase ground faults of low-voltage side of exciting transformer |
| CN107769164A (en) * | 2016-08-16 | 2018-03-06 | 西门子公司 | For protecting the method and protection device of generator or power station unit |
| CN110488136A (en) * | 2019-08-12 | 2019-11-22 | 河海大学 | The rotor one point to ground fault fault detection method of phase modifier excitation system |
-
2011
- 2011-07-27 CN CN2011202678158U patent/CN202190057U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215867A (en) * | 2013-05-30 | 2014-12-17 | 南京南瑞继保电气有限公司 | Online recognition method for single-phase ground faults of low-voltage side of exciting transformer |
| CN107769164A (en) * | 2016-08-16 | 2018-03-06 | 西门子公司 | For protecting the method and protection device of generator or power station unit |
| US10439386B2 (en) | 2016-08-16 | 2019-10-08 | Siemens Aktiengesellschaft | Protection method for protecting a generator or power station unit and protective device for carrying out such a method |
| CN107769164B (en) * | 2016-08-16 | 2020-04-03 | 西门子公司 | Method and device for protecting a generator or a power plant unit |
| CN110488136A (en) * | 2019-08-12 | 2019-11-22 | 河海大学 | The rotor one point to ground fault fault detection method of phase modifier excitation system |
| CN110488136B (en) * | 2019-08-12 | 2021-11-30 | 河海大学 | Rotor one-point grounding fault detection method of phase modulator excitation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120411 Termination date: 20140727 |
|
| EXPY | Termination of patent right or utility model |