CN103427397B - Generator rotor ring guard method on fire and system - Google Patents
Generator rotor ring guard method on fire and system Download PDFInfo
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- CN103427397B CN103427397B CN201310311065.3A CN201310311065A CN103427397B CN 103427397 B CN103427397 B CN 103427397B CN 201310311065 A CN201310311065 A CN 201310311065A CN 103427397 B CN103427397 B CN 103427397B
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- generator rotor
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Abstract
The invention discloses the guard method on fire of a kind of generator rotor ring and system, detect the exciting voltage U in generator excitation circuit and exciting current I in real time, and calculate current resistance R=U/I; Change again based on resistance has judged whether that generator rotor ring fire accident occurs; Determination methods is as follows: criterion 1: if the variable quantity of resistance R has exceeded threshold value k within the Δ t time, then judge that generator rotor ring fire accident occurs; Criterion 2: if the value of resistance R is more than k2 times of steady-state value, then judge that generator rotor ring fire accident occurs; In criterion 1 and criterion 2, arbitrary criterion is set up, then judge that generator rotor ring fire accident occurs; After judgement generator rotor ring fire accident occurs, starting tripping.The guard method on fire of this generator rotor ring and system can accurately detect fault on fire in real time, and to prevent equipment impaired, the program is implemented convenient, and protected effect is good, are easy to promote.
Description
Technical field
The present invention relates to the guard method on fire of a kind of generator rotor ring and system.
Background technology
Large synchronous generator excitation system is in running, the failure rate of slip-ring device is higher, the lighter's under-capacity operation, there is ring fire disorderly closedown in severe one, and very large infringement is caused to equipment, cause because collector ring heating produces ring fire fault unit unplanned outage event at home inner power plant of each electricity power group once repeatedly occurred, because slip ring ring fire may cause expendable device damage, slip ring scaling loss seriously may be caused even to cause rotor permanent bending of rotor to be out of shape and need return repair in shop reason, the recovery time of accident is longer, cause huge economic loss, being necessary draws attention to this type of accident and adopt an effective measure takes precautions against in advance.For the spark fault of slip ring-carbon brush configuration, current do not have special protection to excise this fault, and most of power plant is only the generation adopting the method strengthening equipment-patrolling and periodic maintenance to carry out accident prevention.Also part power plant is had to take following measures, such as install camera in carbon brush position, adopt simple calculating and Logic judgment slip ring working condition, measure slip ring or cooling air temperature etc., take above-mentioned all measures only just as a kind of supplementary means, its accuracy and rapidity all can not meet field requirement.
Relevant arc protection has paper to mention in pertinent literature, and have product simple for the electric arc protection such as middle-low voltage switch cabinet, bus arc light protection system principle, be swift in motion reliable, effectively can alleviate the injury of arclight to equipment and the person.Two conditions that general electric arc protection operating criterion produces when being fault: arc light and overcurrent.Trip command signal is sent when arc light and current increment being detected; Sending alarm signal when arc light or current increment being detected, not sending trip command.
Present stage does not have the protection of the special spark fault for slip ring-carbon brush configuration.Some auxiliary supervision means that part power plant takes can not react fault quickly and accurately, and principle is not mature enough.
Although the spark failure ratio of slip ring-carbon brush configuration is comparatively rare, once there is the consequence produced, very serious, main equipment may be caused to damage and a large amount of economic losses.Most of power plant does not install to protect accordingly and reacts this fault at present, is only the generation adopting the method strengthening equipment-patrolling and periodic maintenance to carry out accident prevention.Because each one level of skill is different, also well can not deal with problems only by reinforcement equipment periodic maintenance, therefore be necessary that the protection scheme designing a kind of special rapid sensitive is to reflect the spark fault of generating set slip ring-carbon brush configuration.
Summary of the invention
Technical problem to be solved by this invention is to provide the guard method on fire of a kind of generator rotor ring and system; the guard method on fire of this generator rotor ring and system can accurately detect fault on fire in real time, and to prevent equipment impaired, the program is implemented convenient; protected effect is good, is easy to promote.
The technical solution of invention is as follows:
The guard method on fire of a kind of generator rotor ring, detects the exciting voltage U in generator excitation circuit and exciting current I in real time, and calculates current resistance R=U/I;
Change again based on resistance has judged whether that generator rotor ring fire accident occurs; Determination methods is as follows:
Criterion 1: if the variable quantity of resistance R has exceeded threshold value k within the Δ t time, then judge generator amature
Slip ring fire accident occurs;
Criterion 2: if the value of resistance R is more than k2 times of steady-state value, then judge generator rotor ring fire accident
Occur;
Described Δ t gets any one value in 1-60s;
Described threshold value k gets any one value in 1%-20%;
K2 is any one value in 1.15-1.4;
In criterion 1 and criterion 2, arbitrary criterion is set up, then judge that generator rotor ring fire accident occurs;
After judgement generator rotor ring fire accident occurs, starting tripping.
Described exciting voltage U and exciting current I is the mean value in the Δ t1 time; Δ t1 is any one value in 2-4s.
Described Δ t1=3s; Δ t=10s, k=10%.
At generator rotor ring place configuration arc photosensor, when the luminous intensity that arc photosensor detects exceedes the setting value of arc photosensor, starting tripping.
At the cooling air channel place of generator rotor ring configuration temperature sensor, when the temperature that temperature sensor detects exceedes set point, starting tripping.
A kind of generator rotor ring protection system on fire, comprises main control module, exciting voltage and exciting current testing circuit, warning circuit and tripping operation actuator; Resistance calculations unit is integrated with in main control module; The determination methods of aforesaid generator rotor ring guard method on fire is adopted to judge whether that generator rotor ring fire accident occurs.
Described generator rotor ring protection system on fire also comprises the temperature sensing circuit be connected with main control module.
Described generator rotor ring protection system on fire also comprises the arc light light intensity detection circuit be connected with main control module.
Technical conceive:
The spark fault of large synchronous generator group slip ring-carbon brush configuration is not a kind of frequent failure, but shows according to nearest accident statistics, but increases gradually in recent years because ring fire causes Generator Slip Ring to burn serious accident.Cause the reason of fault to be mostly to cause generating heat because carbon brush and slip ring contact resistance increase, produce ring fire scaling loss brush holder and slip ring time serious, in view of this, the present invention is based on the monitoring of resistance to realize generator rotor ring protection on fire.
Beneficial effect:
Whether generator rotor ring of the present invention guard method on fire and system, occur based on the variation monitoring generator rotor ring of carbon brush and slip ring contact resistance is on fire originally, once fault occurs, then in time starting tripping to excise fault.
Compared with existing collector ring ring fire malfunction monitoring, alarm scheme, excitation impedance variable quantity criterion used in the present invention more comprehensive and reasonable, better effect can be obtained, existing calculation level only considers short-term (5s) interior maxima and minima, exciting voltage mean deviation may be caused comparatively large, increase the possibility of erroneous judgement.
And this invention considers the various consequence factors causing slip ring on fire; add arc light criterion and slip ring cooling wind-warm syndrome criterion with gearing to actual circumstances; catch the specific features of ring fire fault; overcome limitation and the deviation of prior art; make protection scheme science and comprehensively more; its accuracy and rapidity more meet on-the-spot actual, thus can avoid the unnecessary loss of judging by accident and bringing.
The present invention is to the change of generator operation energized circuit impedance, and the generation of arc light and the change comprehensive descision of associated temperature can react fault quickly and accurately, and formation quantizating index is weighed fault degree, identifies that the accuracy that fault occurs is high.
In addition, due to the function possessed in existing system during the data such as collection current/voltage, therefore, only need the heart in the controlling to increase resistance calculations unit (as passed through software simulating) and can impedance monitoring be realized, without the need to increasing new cost, therefore, implement simple, lower cost, has very high value for applications.Accompanying drawing explanation
Fig. 1 is the electric theory diagram of generator rotor ring protection system on fire;
Fig. 2 is the measured curve of generator rotor ring process on fire.
Embodiment
Below with reference to the drawings and specific embodiments, the present invention is described in further details:
Embodiment 1:
The guard method on fire of a kind of generator rotor ring, the exciting voltage U in real time in detection generator excitation circuit and exciting current I[voltage and current are here all direct currents], and calculate current resistance R=U/I;
Change again based on resistance has judged whether that generator rotor ring fire accident occurs; Determination methods is as follows:
Criterion 1: if the variable quantity of resistance R has exceeded threshold value k within the Δ t time, then judge that generator rotor ring fire accident occurs;
Criterion 2: if the value of resistance R is more than k2 times of steady-state value, then judge that generator rotor ring fire accident occurs;
In criterion 1 and criterion 2, arbitrary criterion is set up, then judge that generator rotor ring fire accident occurs;
After judgement generator rotor ring fire accident occurs, starting tripping.
Described exciting voltage U and exciting current I is the mean value in the Δ t1 time; Described Δ t1=3s; Δ t=10s, k=10%.
At generator rotor ring place configuration arc photosensor, when the luminous intensity that arc photosensor detects exceedes the setting value of arc photosensor, starting tripping.
At the cooling air channel place of generator rotor ring configuration temperature sensor, when the temperature that temperature sensor detects exceedes set point, starting tripping.
As Fig. 1, a kind of generator rotor ring protection system on fire, comprises main control module, exciting voltage and exciting current testing circuit, warning circuit and tripping operation actuator; Resistance calculations unit is integrated with in main control module; The determination methods of aforesaid generator rotor ring guard method on fire is adopted to judge whether that generator rotor ring fire accident occurs.Described generator rotor ring protection system on fire also comprises the temperature sensing circuit be connected with main control module.Described generator rotor ring protection system on fire also comprises the arc light light intensity detection circuit be connected with main control module.
As Fig. 2, see measured curve:
Locate in the A moment: U=240V, I=2550A, R=0.0941 (ohm); For parameter during stable state;
Locate in the B moment: U=264V, I=2520A, R=0.1048 (ohm); For parameter during disturbance; 1.11 times when resistance is stable state;
Locate in the C moment: U=282V, I=2600A, R=0.1085 (ohm); For the parameter of fault early period of origination; 1.15 times when resistance is stable state; Now resistance starts to rise;
Locate in the D moment: U=318V, I=2590A, R=0.1228 (ohm); For the parameter in mid-term occurs fault; 1.30 times when resistance is stable state; Now resistance sharply rises.
The slip ring running status on-line monitoring that this patent relates to and automatic safety device are exactly the special spark fault for slip ring-carbon brush configuration and establish, be in operation during carbon brush loose contact reflection, the change of energized circuit impedance when being occurred by fault, the operation conditions of the generation of arc light and the change comprehensive descision generator of associated temperature, the generation of the fault that can react more quickly and accurately, sound and light signal is sent in early days in fault, make a response to remind operations staff, process accordingly, fix a breakdown, or outlet tripping operation causes serious consequence to reduce the loss to avoid fault spread.Simultaneously by impedance measurement data in Power Plant DCS, the display of SIS system interface, operations staff and equipment management personnel not only can real time inspections, and can carry out trend analysis, grasp unit exception situation in time.
This automatic safety device is primarily of impedance criterion, temperature criterion, arc light criterion three part composition, and protection can select voted signal or outlet tripping operation.
Embodiment 2
1. impedance criterion
Impedance criterion realizes mainly through generator protection, by calculating excitation real-time impedance value:
Rt=U
excitation/ I
excitation, and calculate the 5s moving average R5 of excitation impedance, the Sudden Changing Rate Δ R of 5s mean value in 3s, 10min moving average R600.
R
0for energized circuit impedance set-point.
Impedance protection logical specification is as follows:
A) excitation impedance alarm:
When excitation impedance is than set-point R
0during slow increase, send alarm signal, remind long journey personnel to strengthen monitoring or timely adjust operation operating mode, avoid fault spread.
(R
5-R
600)>=5%R
600or R
5>=105%R
0send out " energized circuit impedance alarm I " alarm;
(R
5-R
600)>=10%R
600or R
5>=110%R
0send out " energized circuit impedance alarm II " alarm;
B) sampling circuit breakage lock device:
Exciting current needed for computing impedance, exciting voltage are gathered by transmitter.
Δ R>=50%R
0, or when DCS system judges that exciting current, exciting voltage are bad quality, latch-up protection exports.
C) impedance protection outlet:
Work as R
5>=115%R
0, impedance criterion exports.
2. arc protection criterion:
Be made up of special arc photosensor, the optical fiber transmitting light signal and the arc light protecting device that are installed at slip ring-carbon brush configuration.Produce spark when fault occurs, arc photosensor experiences the enhancing of luminous intensity, sends arc light protecting device to through optical fiber, and reach arc light protecting device action after setting value, outlet junctions delivers to protective device, as Protection criteria.Arc protection definite value can carry out adjusting to adapt to different environmental requirements according to site environment.In order to prevent arc light criterion misoperation in periodic maintenance process, the soft pressing plate of KG1 being set, throwing can being carried out to arc protection by soft clamp operation and moving back operation.
3. temperature protection criterion:
When slip ring-carbon brush configuration flashing fault, the fault initial stage often shows that slip ring surface temperature anomaly raises, therefore temperature criterion is provided with here, set up temperature element at slip ring cooling air channel place or adopt infrared ray sensor, monitoring cooling wind-warm syndrome, when cooling air temperature variation or steady-state quantity reach definite value, temperature criterion exports.Temperature criterion is also carried out throwing by soft pressing plate KG2 and is moved back.
In conjunction with the feature of unit control system, introduce and calculate and decision logic configuration, show resistance value in real time, and output alarm, carry out comprehensive descision in conjunction with arc protection and temperature criterion simultaneously, when breaking down, make circuit breaker trip to excise fault.
Use generator excitation voltage deviation to measure determining method, dynamic calculation analysis and judgement are carried out to the fluctuation of rotor voltage pulse type, reflection slip ring-carbon brush working condition.
At the initial stage of fault progression, operations staff adjusts after obtaining alarm signal fast, processes accordingly, fixes a breakdown, if variation tendency is accelerated to reach certain amplitude by action in generator outlet circuit breaker trip, makes failure removal, avoids fault spread.Simultaneously by measurement data such as impedances in Power Plant DCS, the display of SIS system interface, can real time inspection can be equipment management personnel and carry out trend analysis, grasp unit exception situation in time, so that early detection fault processes in time.
Claims (8)
1. a generator rotor ring guard method on fire, is characterized in that, detects the exciting voltage U in generator excitation circuit and exciting current I, and calculates current resistance R=U/I;
Change again based on resistance has judged whether that generator rotor ring fire accident occurs; Determination methods is as follows: criterion 1: if the variable quantity of resistance R has exceeded threshold value k within the △ t time, then judge that generator rotor ring fire accident occurs;
Criterion 2: if the value of resistance R is more than k2 times of steady-state value, then judge that generator rotor ring fire accident occurs;
Described △ t gets any one value in 1-60s; Described threshold value k gets any one value in 1%-20%;
K2 is any one value in 1.15-1.4;
In criterion 1 and criterion 2, arbitrary criterion is set up, then judge that generator rotor ring fire accident occurs;
After judgement generator rotor ring fire accident occurs, starting tripping.
2. generator rotor ring according to claim 1 guard method on fire, is characterized in that, described exciting voltage U and exciting current I is the mean value in the △ t1 time; △ t1 is any one value in 2-4s.
3. generator rotor ring according to claim 2 guard method on fire, is characterized in that, described △ t1=3s; △ t=10s, k=10%.
4. the guard method on fire of the generator rotor ring according to any one of claim 1-3; it is characterized in that; at generator rotor ring place configuration arc photosensor, when the luminous intensity that arc photosensor detects exceedes the setting value of arc photosensor, starting tripping.
5. the guard method on fire of the generator rotor ring according to any one of claim 1-3, is characterized in that, at the cooling air channel place of generator rotor ring configuration temperature sensor, when the temperature that temperature sensor detects exceedes set point, and starting tripping.
6. a generator rotor ring protection system on fire, is characterized in that, comprises main control module, exciting voltage and exciting current testing circuit, warning circuit and tripping operation actuator; Resistance calculations unit is integrated with in main control module; The determination methods of the generator rotor ring guard method on fire described in any one of claim 1-3 is adopted to judge whether that generator rotor ring fire accident occurs.
7. generator rotor ring according to claim 6 protection system on fire, is characterized in that, also comprises the temperature sensing circuit be connected with main control module.
8. the protection system on fire of the generator rotor ring according to claim 6 or 7, is characterized in that, also comprises the arc light light intensity detection circuit be connected with main control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310311065.3A CN103427397B (en) | 2013-07-23 | 2013-07-23 | Generator rotor ring guard method on fire and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310311065.3A CN103427397B (en) | 2013-07-23 | 2013-07-23 | Generator rotor ring guard method on fire and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103427397A CN103427397A (en) | 2013-12-04 |
| CN103427397B true CN103427397B (en) | 2015-12-23 |
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|---|---|---|---|
| CN201310311065.3A Expired - Fee Related CN103427397B (en) | 2013-07-23 | 2013-07-23 | Generator rotor ring guard method on fire and system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158689A (en) * | 2015-10-19 | 2015-12-16 | 南京中凯光电技术有限公司 | System and method for detecting arc light faults in generator slip ring room |
| CN110687446B (en) * | 2019-07-15 | 2022-02-08 | 浙江运达风电股份有限公司 | Double-fed wind driven generator electric brush and slip ring early fault diagnosis method |
| CN112557899A (en) * | 2020-11-20 | 2021-03-26 | 浙江运达风电股份有限公司 | Independent-judgment double-fed motor slip ring fault monitoring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1476527A (en) * | 1974-10-02 | 1977-06-16 | Suhl Elektrogeraete Veb K | Arrangement for detecting sparking at the brushes of electrical machines |
| CN1695065A (en) * | 2002-09-10 | 2005-11-09 | 阿尔斯托姆科技有限公司 | Method and device for detecting sparking and spark erosion in electric machines |
| CN102232267A (en) * | 2008-10-22 | 2011-11-02 | 阿尔斯通技术有限公司 | Device and method for monitoring and/or analyzing rotors of electric machines in operation |
-
2013
- 2013-07-23 CN CN201310311065.3A patent/CN103427397B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1476527A (en) * | 1974-10-02 | 1977-06-16 | Suhl Elektrogeraete Veb K | Arrangement for detecting sparking at the brushes of electrical machines |
| CN1695065A (en) * | 2002-09-10 | 2005-11-09 | 阿尔斯托姆科技有限公司 | Method and device for detecting sparking and spark erosion in electric machines |
| CN102232267A (en) * | 2008-10-22 | 2011-11-02 | 阿尔斯通技术有限公司 | Device and method for monitoring and/or analyzing rotors of electric machines in operation |
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| CN103427397A (en) | 2013-12-04 |
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Granted publication date: 20151223 Termination date: 20160723 |