CN105305906A - Rapid field suppression structure and method for generator - Google Patents
Rapid field suppression structure and method for generator Download PDFInfo
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- CN105305906A CN105305906A CN201410281012.6A CN201410281012A CN105305906A CN 105305906 A CN105305906 A CN 105305906A CN 201410281012 A CN201410281012 A CN 201410281012A CN 105305906 A CN105305906 A CN 105305906A
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Abstract
The invention discloses a rapid field suppression structure and method for a generator. The rapid field suppression structure comprises an excitation rectifier, wherein the excitation rectifier is connected with an exciting winding; the exciting winding corresponds to the generator; a field suppression switch and field suppression resistors are arranged between the excitation rectifier and the exciting winding; all field suppression resistors are linear resistors, are sectionally arranged, and are at least connected with two groups of linear resistors in series; one linear resistor is a fixed-segment resistor; the other resistors are variable-segment resistors; two ends of each variable-segment resistor are connected with blocking and deblocking switches; and the adjacent blocking and deblocking switches are connected with each other. The rapid field suppression structure has the advantages that the linear resistors are fully utilized to ensure reliable conduction; the defect that nonlinear resistors cannot be reliably conducted is avoided; and meanwhile, the field suppression speed is increased.
Description
Technical field
The quick de-excitation structure of concerned power generation machine of the present invention, particularly a kind of generator and method.
Background technology
At present, various turbo generator and the many employings of various hydraulic generator it encourage or from shunt excitation mode excitation, generally all adopt nonlinear resistance demagnetization or linear resistance demagnetization.The advantage of nonlinear resistance demagnetization is adopted to be: if nonlinear resistance can conducting when demagnetization, its demagnetization speed may be faster than linear resistance, but the conducting that problem is nonlinear resistance is the voltage that needs one are higher " punctures " ability conducting by it, because the demagnetization operating mode of generator is ever-changing, can not ensure in actual motion to provide sufficiently high voltage to remove " puncturing " nonlinear resistance at every turn, therefore, even if electric current is very large sometimes, nonlinear resistance one conducting surely can not be ensured, the accident in Dai Hai power plant on January 1st, 2006 just describes this point.The advantage of linear resistance demagnetization demagnetization is can conducting when any operating mode, but demagnetization speed slower than nonlinear resistance (assuming that the voltage at generator excitation winding two ends is identical with during employing nonlinear resistance when linear resistance drops into demagnetization), therefore, still may cause damage to generator, the accident in Chaozhou power plant on March 28th, 2012 just describes this point.
Fig. 1 is existing nonlinear resistance demagnetization structure, and Fig. 2 is existing linear nonlinear resistance demagnetization structure.It comprises field rectifier 1, and field rectifier 1 connects excitation winding 2, the corresponding generator 5 of excitation winding, field suppression switch 3 and de-excitation resistance 4 is provided with between field rectifier 1 and excitation winding 2, field suppression switch 3 is connected with de-excitation resistance 4, when needing demagnetization, opens field suppression switch 3.The de-excitation resistance of Fig. 1 is nonlinear resistance, and the de-excitation resistance of Fig. 2 is linear resistance.
Summary of the invention
Technical problem solved by the invention is to provide a kind of generator quick de-excitation structure and method, both guarantees fast conducting, ensures demagnetization speed again.
Technical scheme of the present invention is: a kind of generator quick de-excitation structure, it comprises field rectifier, field rectifier connects excitation winding, the corresponding generator of excitation winding, field suppression switch and de-excitation resistance is provided with between field rectifier and excitation winding, this de-excitation resistance is all linear resistance, this de-excitation resistance subsection setup, it is at least connected by two groups of linear resistances, one of them linear resistance is canned paragraph resistance, other resistance is change section resistance, and pass is backed out in each change section resistance two ends connection throwing, and adjacent throwing is backed out pass and is connected.
This change section resistance is more than two, and the resistance of each change section resistance is not identical.
The resistance of change section resistance is the multiple of canned paragraph resistance.
This throwing is backed out and is closed as circuit breaker, contactor or IGBT.
A kind of generator quick de-excitation method, use a kind of generator quick de-excitation structure, it comprises field rectifier, field rectifier connects excitation winding, the corresponding generator of excitation winding, field suppression switch and de-excitation resistance is provided with between field rectifier and excitation winding, this de-excitation resistance is all linear resistance, this de-excitation resistance subsection setup, it has two groups of linear resistance series connection at least, and one of them linear resistance is canned paragraph resistance, and other resistance is change section resistance, each change section resistance two ends connects throwing and backs out pass, and adjacent throwing is backed out pass and is connected.
Drop into the de-excitation resistance of any section according to demand when needing eliminating magnetism of generator.
After loop current takes effect, the de-excitation resistance dropped into can be exited, and drop into other de-excitation resistances, until all de-excitation resistance all drops into.
Beneficial effect of the present invention is: take full advantage of the advantage that linear resistance guarantees reliable conducting, and avoiding nonlinear resistance can not the shortcoming of reliable conducting, accelerates the speed of demagnetization simultaneously.
Accompanying drawing explanation
Fig. 1 is the demagnetization structure of existing employing nonlinear resistance.
Fig. 2 is the demagnetization structure of existing employing linear resistance.
Fig. 3 is generator quick de-excitation structure of the present invention.
Embodiment
As shown in Figure 3, a kind of generator quick de-excitation structure, it comprises field rectifier 1, field rectifier 1 connects excitation winding 2, the corresponding generator 5 of excitation winding 2, field suppression switch 3 and de-excitation resistance 4 is provided with between field rectifier 1 and excitation winding 2, wherein, this de-excitation resistance 4 is all linear resistance, this de-excitation resistance 4 subsection setup, and it is at least connected by two groups of linear resistances, one of them linear resistance is canned paragraph resistance 41, other resistance is change section resistance 42, and pass 6 is backed out in each change section resistance 42 two ends connection throwing, and adjacent throwing is backed out pass 6 and is connected.This change section resistance is more than two, and the resistance of each change section resistance can not be identical.The resistance of change section resistance can be the multiple of canned paragraph resistance.This throwing is backed out and is closed as circuit breaker, contactor or IGBT.
Linear de-excitation resistance is divided into some sections by the present invention, when needs eliminating magnetism of generator, only drop into a part wherein, in demagnetization process, the electric current in continuous monitoring killing magneto-resistor, when electric current is reduced to a certain degree, seal in another part de-excitation resistance (being no more than desired value with excitation winding voltage to be as the criterion, lower same) again, after electric current reduces further, seal in a part of de-excitation resistance again, until seal in whole de-excitation resistance.After ensureing to seal in de-excitation resistance successively, do not cause rotor voltage to exceed desired value, first should exit (short circuit) part de-excitation resistance, and then seal in new resistance.
De-excitation resistance all adopts linear resistance, linear resistance can be divided into some sections, every section of resistance can be unequal, so that control system can select any one section or several sections to drop into/exit simultaneously, if desired, also can when dropping into certain section or a few sections another section that exit to have dropped into or separately several sections, thus under ensureing the condition that the voltage of excitation winding in demagnetization process remains at a little less than threshold limit value, so just accelerate the speed of demagnetization.
The input of de-excitation resistance, to exit and interval time is calculated by excitation system AVR according to the voltage at demagnetization electric current and excitation winding two ends and determines.Electric current in its basis excitation winding, excitation winding both end voltage and the expection voltage after dropping into new de-excitation resistance are determined.When demagnetization, due to the continuous consumption of electric current on de-excitation resistance, its value reduces gradually.If excitation winding both end voltage is still in allowed band after calculating display adds one section of de-excitation resistance again, dropped into the de-excitation resistance of 1 base again by control switch, if electric current decrease speed is very fast, then also directly may drop into the de-excitation resistance of 2 bases or more.
The determination of de-excitation resistance base can be determined according to the technical conditions of generating set.Such as, the application conditions of certain generating set is, allows maximumly to encourage by force 2 times that electric current is rated exciting current, and this electric current is exactly the foundation determining de-excitation resistance base.Assuming that this unit has maximum demagnetization electric current when encouraging by force unsuccessful rear demagnetization, according to relevant manufacturer's standard, excitation winding dispatch from the factory after the highest test voltage be no more than 7 times of rated voltage, then selected ceiling voltage when encouraging by force rear demagnetization is 6 times of rated excitation voltage, can obtain following formula thus:
6 (times rated excitation voltage)/(R
de-excitation resistance minimum value+ R
excitation winding)=2 (times rated exciting current)
Thus,
3 (rated excitation voltage/rated exciting current)=R
de-excitation resistance minimum value+ R
excitation winding
Due to
Rated excitation voltage/rated exciting current=R
excitation winding
So,
R
de-excitation resistance minimum value=2 × R
excitation winding
The de-excitation resistance value of Here it is 1 base, it is approximately equal to 2 times of generator amature resistance (hot value), i.e. the hot resistance value of 2 times of excitation winding.
When excitation forcing ratio is not 2 times, its fiducial value can be calculated as stated above.
Determine the maximum of de-excitation resistance below.
It is generally acknowledged when the current attenuation in excitation winding to rated current 5% or less time can think that demagnetization process terminates.For accelerating demagnetization speed, usually the resistance as far as possible strengthening de-excitation resistance under possible condition is all wished, but the resistance of de-excitation resistance crosses the overtension that senior general may make in excitation winding, therefore, when having ready conditions, both the resistance of de-excitation resistance should have been made as far as possible large, and also the voltage that will control in excitation winding is no more than the permissible value preset simultaneously.Assuming that when demagnetization closes to an end (electric current in excitation winding is slightly larger than 5% rated exciting current), the terminal voltage of excitation winding is still 6 times of rated excitation voltages, and remain near this level in demagnetization process, then demagnetization speed is at this moment the fastest.
The maximum of de-excitation resistance can be obtained thus:
6 (times rated excitation voltage)/(R
de-excitation resistance maximum+ R
excitation winding)=0.05 (times rated exciting current)
6 (times rated excitation voltage)/0.05 (times rated exciting current)=(R
de-excitation resistance maximum+ R
excitation winding)
R
de-excitation resistance maximum+ R
excitation winding=120 (rated excitation voltage/rated exciting currents)
Equally due to
Rated excitation voltage/rated exciting current=R
excitation winding
R
de-excitation resistance maximum=119 × R
excitation winding
And
R
de-excitation resistance maximum=R
de-excitation resistance minimum value+ n × R
de-excitation resistance minimum value=119 × R
excitation winding
R
de-excitation resistance maximum=(n+1) × R
de-excitation resistance minimum value
=(n+1) × 2 × R
excitation winding=119 × R
excitation winding
=(n+1) × R
excitation winding=59.5 × R
excitation winding
≈ 60 × R
excitation winding
Can obtain thus
R
de-excitation resistance minimum value=2 × R
excitation winding
R
de-excitation resistance maximum=60 × R
excitation winding
In order to obtain larger de-excitation resistance excursion, reduce the number of fragments of de-excitation resistance simultaneously, each section of the de-excitation resistance designed is also unequal, but in use by controlling the throwing, retreating of each section of different resistance de-excitation resistance, the slight change that can to obtain with 1 base be step-length, thus obtain approximately continuous change, avoid the dangerous and problem that demagnetization speed is excessively slow because phase step type change produces.
In order to ensure the safety of generator excitation winding, de-excitation resistance has one section to be fixing access, with the safety preventing the throwing, retreating malfunctioning switch due to each section of de-excitation resistance from jeopardizing excitation winding.The ceiling voltage that the selection of this section of fixing de-excitation resistance allows according to maximum current when encouraging by force and excitation winding is determined, the resistance of other section of resistance is all the multiple of this section of resistance.
The throwing, retreating Controlling principle of de-excitation resistance: electric current during owing to starting demagnetization is maximum, and the de-excitation resistance resistance therefore dropped into is minimum value or smaller value; Along with constantly carrying out of demagnetization, part energy is consumed, and the electric current in loop is more and more less, allows the resistance value of input also more and more higher.The opportunity of dropping into can be calculated at any time by the electric current of control system according to reality.
For example, if de-excitation resistance is 1.0 when electric current is 2.0, and voltage is now exactly permissible value 2.0 × 1.0=2.0, then when current attenuation to 1.0 time just can drop into the resistance that the 2nd section is also 1.0, voltage is now still 1.0 × 2.0=2.0, in allowed limits; When electric current is 0.5, allow the resistance dropped into be 4.0, voltage is now 0.5 × 4.0=2.0, still in allowed limits.
Due to the best input of resistance when can control demagnetization and making time, therefore demagnetization can carry out demagnetization with prestissimo, safest mode in controlled range.
The throwing, retreating switch of de-excitation resistance can adopt contactor, also can adopt circuit breaker, even also can adopt the power electronic device such as such as IGBT in some occasion (when such as electric current is less).When throwing, retreating switch connection, de-excitation resistance is exited; When throwing, retreating switch disconnects, de-excitation resistance is put into.For the sake of security, should first exit part de-excitation resistance during each action, then access new de-excitation resistance, the overtension produced after dropping into prevent new de-excitation resistance.
Be divided into 7 sections for de-excitation resistance, the value relatable of each section of de-excitation resistance is:
Canned paragraph resistance is the 1.0,1st section be the 1.0,2nd section be the 2.0,3rd section is 4.0, and the 4th section is the 8.0,5th section be the 16.0,6th section is 28.0.
If wish that de-excitation resistance has larger excursion, the 6th section of resistance also can change 32.0 into.
For sake of convenience, de-excitation resistance value all represents with perunit value instead of represents with actual value.
Carry out demagnetization with 2 times of rated exciting currents and require all the time by voltage control close under the operating mode of 6 times:
Only drop into canned paragraph 1st time, now de-excitation resistance resistance is 1.0;
Drop into the 1st section 2nd time, now de-excitation resistance resistance is 2.0;
Exit the 1st section for 3rd time and drop into the 2nd section, now de-excitation resistance resistance is 3.0;
The 4th drops into the 1st section, and now de-excitation resistance resistance is 4.0;
The 5th exits the 1st, 2 section and drops into the 3rd section, and now de-excitation resistance resistance is 5.0;
Drop into the 1st section 6th time, now de-excitation resistance resistance is 6.0;
Exit the 1st section for 7th time and drop into the 2nd section, now de-excitation resistance resistance is 7.0;
Drop into the 1st section 8th time, now de-excitation resistance resistance is 8.0.
Exit the 1st, 2,3 section for 9th time and drop into the 4th section, now de-excitation resistance resistance is 9.0;
Drop into the 1st section 10th time, now de-excitation resistance resistance is 10.0.
Exit the 1st section for 11st time and drop into the 2nd section, now de-excitation resistance resistance is 11.0.
Drop into the 1st section 12nd time, now de-excitation resistance resistance is 12.0.
Exit the 1st, 2 section for 13rd time and drop into the 3rd section, now de-excitation resistance resistance is 13.0;
Drop into the 1st section 14th time, now de-excitation resistance resistance is 14.0.
Exit the 1st section for 15th time and drop into the 2nd section, now de-excitation resistance resistance is 15.0.
Drop into the 1st section 16th time, now de-excitation resistance resistance is 16.0.
Exit the 1st, 2,3,4 section for 17th time and drop into the 5th section, now de-excitation resistance resistance is 17.0.
Drop into the 1st section 18th time, now de-excitation resistance resistance is 18.0.
Exit the 1st section for 19th time and drop into the 2nd section, now de-excitation resistance resistance is 19.0.
Drop into the 1st section 20th time, now de-excitation resistance resistance is 20.0.
Exit the 1st, 2 section for 21st time and drop into the 3rd section, now de-excitation resistance resistance is 21.0.
Drop into the 1st section 22nd time, now de-excitation resistance resistance is 22.0.
Exit the 1st section for 23rd time and drop into the 2nd section, now de-excitation resistance resistance is 23.0.
Drop into the 1st section 24th time, now de-excitation resistance resistance is 24.0.
Exit the 1st, 2,3 section for 25th time and drop into the 4th section, now de-excitation resistance resistance is 25.0.
Drop into the 1st section 26th time, now de-excitation resistance resistance is 26.0.
Exit the 1st section for 27th time and drop into the 2nd section, now de-excitation resistance resistance is 27.0.
Drop into the 1st section 28th time, now de-excitation resistance resistance is 28.0.
Exit the 1st, 2 section for 29th time and drop into the 3rd section, now de-excitation resistance resistance is 29.0.
Drop into the 1st section 30th time, now de-excitation resistance resistance is 30.0.
Exit the 1st section for 31st time and drop into the 2nd section, now de-excitation resistance resistance is 31.0.
Drop into the 1st section 32nd time, now de-excitation resistance resistance is 32.0.
Exit the 2nd, 4,5 section for 33rd time and drop into the 6th section, now de-excitation resistance resistance is 33.0.
Drop into the 1st section 34th time, now de-excitation resistance resistance is 34.0.
Exit the 1st section for 35th time and drop into the 2nd section, now de-excitation resistance resistance is 35.0.
Drop into the 1st section 36th time, now de-excitation resistance resistance is 36.0.
Exit the 1st, 2,3 section for 37th time and drop into the 4th section, now de-excitation resistance resistance is 36.0.
Drop into the 1st section 38th time, now de-excitation resistance resistance is 37.0.
Exit the 1st section for 39th time and drop into the 2nd section, now de-excitation resistance resistance is 39.0.
Drop into the 1st section 40th time, now de-excitation resistance resistance is 40.0.
Exit the 1st, 2 section for 41st time and drop into the 3rd section, now de-excitation resistance resistance is 41.0.
Drop into the 1st section 42nd time, now de-excitation resistance resistance is 42.0.
Exit the 1st section for 43rd time and drop into the 2nd section, now de-excitation resistance resistance is 43.0.
Drop into the 1st section 44th time, now de-excitation resistance resistance is 44.0.
Exit the 1st, 2,3,4 section for 45th time and drop into the 5th section, now de-excitation resistance resistance is 45.0.
Drop into the 1st section 46th time, now de-excitation resistance resistance is 46.0.
Exit the 1st section for 47th time and drop into the 2nd section, now de-excitation resistance resistance is 47.0.
Drop into the 1st section 48th time, now de-excitation resistance resistance is 48.0.
Exit the 1st, 2 section for 49th time and drop into the 3rd section, now de-excitation resistance resistance is 49.0.
Drop into the 1st section 50th time, now de-excitation resistance resistance is 50.0.
Exit the 1st section for 51st time and drop into the 2nd section, now de-excitation resistance resistance is 51.0.
Drop into the 1st section 52nd time, now de-excitation resistance resistance is 52.0.
Exit the 1st, 2,3 section for 53rd time and drop into the 4th section, now de-excitation resistance resistance is 53.0.
Drop into the 1st section 54th time, now de-excitation resistance resistance is 54.0.
Exit the 1st section for 55th time and drop into the 2nd section, now de-excitation resistance resistance is 55.0.
Drop into the 1st section 56th time, now de-excitation resistance resistance is 56.0.
Exit the 1st, 2 section for 57th time and drop into the 3rd section, now de-excitation resistance resistance is 57.0;
Drop into the 1st section 58th time, now de-excitation resistance resistance is 58.0.
Exit the 1st section for 59th time and drop into the 2nd section, now de-excitation resistance resistance is 59.0.
Drop into the 1st section 60th time, now de-excitation resistance resistance is 60.0.
Demagnetization (electric current now in excitation winding is less) under another operating mode.
Drop into the 4th section 1st time, now de-excitation resistance resistance is 9.0.
Drop into the 1st section 2nd time, now de-excitation resistance resistance is 10.0.
Exit the 1st section for 3rd time and drop into the 2nd section, now de-excitation resistance resistance is 11.0;
The 4th drops into the 1st section, and now de-excitation resistance resistance is 12.0.
The 5th exits the 1st, 2 section and drops into the 3rd section, and now de-excitation resistance resistance is 13.0.
Drop into the 1st section 6th time, now de-excitation resistance resistance is 14.0.
Exit the 1st section for 7th time and drop into the 2nd section, now de-excitation resistance resistance is 15.0.
Drop into the 1st section 8th time, now de-excitation resistance resistance is 16.0.
Exit the 1st, 2,3,4 section for 9th time and drop into the 5th section, now de-excitation resistance resistance is 17.0.
Drop into the 1st section 10th time, now de-excitation resistance resistance is 18.0.
Exit the 1st section for 11st time and drop into the 2nd section, now de-excitation resistance resistance is 19.0.
Drop into the 1st section 12nd time, now de-excitation resistance resistance is 20.0.
Exit the 1st, 2 section for 13rd time and drop into the 3rd section, now de-excitation resistance resistance is 21.0.
Drop into the 1st section 14th time, now de-excitation resistance resistance is 22.0.
Exit the 1st section for 15th time and drop into the 2nd section, now de-excitation resistance resistance is 23.0.
Drop into the 1st section 16th time, now de-excitation resistance resistance is 24.0.
Exit the 1st, 2,3 section for 17th time and drop into the 4th section, now de-excitation resistance resistance is 25.0.
Drop into the 1st section 18th time, now de-excitation resistance resistance is 26.0.
Exit the 1st section for 19th time and drop into the 2nd section, now de-excitation resistance resistance is 27.0.
Drop into the 1st section 20th time, now de-excitation resistance resistance is 28.0.
Exit the 1st, 2 section for 21st time and drop into the 3rd section, now de-excitation resistance resistance is 29.0.
Drop into the 1st section 22nd time, now de-excitation resistance resistance is 30.0.
Exit the 1st section for 23rd time and drop into the 2nd section, now de-excitation resistance resistance is 31.0.
Drop into the 1st section 24th time, now de-excitation resistance resistance is 32.0.
Exit the 2nd, 4,5 section for 25th time and drop into the 6th section, now de-excitation resistance resistance is 33.0.
Drop into the 1st section 26th time, now de-excitation resistance resistance is 34.0.
Exit the 1st section for 27th time and drop into the 2nd section, now de-excitation resistance resistance is 35.0.
Drop into the 1st section 28th time, now de-excitation resistance resistance is 36.0.
Exit the 1st, 2,3 section for 29th time and drop into the 4th section, now de-excitation resistance resistance is 36.0.
Drop into the 1st section 30th time, now de-excitation resistance resistance is 37.0.
Exit the 1st section for 31st time and drop into the 2nd section, now de-excitation resistance resistance is 39.0.
Drop into the 1st section 32nd time, now de-excitation resistance resistance is 40.0.
Exit the 1st, 2 section for 33rd time and drop into the 3rd section, now de-excitation resistance resistance is 41.0.
Drop into the 1st section 34th time, now de-excitation resistance resistance is 42.0.
Exit the 1st section for 35th time and drop into the 2nd section, now de-excitation resistance resistance is 43.0.
Drop into the 1st section 36th time, now de-excitation resistance resistance is 44.0.
Exit the 1st, 2,3,4 section for 37th time and drop into the 5th section, now de-excitation resistance resistance is 45.0.
Drop into the 1st section 38th time, now de-excitation resistance resistance is 46.0.
Exit the 1st section for 39th time and drop into the 2nd section, now de-excitation resistance resistance is 47.0.
Drop into the 1st section 40th time, now de-excitation resistance resistance is 48.0.
Exit the 1st, 2 section for 41st time and drop into the 3rd section, now de-excitation resistance resistance is 49.0.
Drop into the 1st section 42nd time, now de-excitation resistance resistance is 50.0.
Exit the 1st section for 43rd time and drop into the 2nd section, now de-excitation resistance resistance is 51.0.
Drop into the 1st section 44th time, now de-excitation resistance resistance is 52.0.
Exit the 1st, 2,3 section for 45th time and drop into the 4th section, now de-excitation resistance resistance is 53.0.
Drop into the 1st section 46th time, now de-excitation resistance resistance is 54.0.
Exit the 1st section for 47th time and drop into the 2nd section, now de-excitation resistance resistance is 55.0.
Drop into the 1st section 48th time, now de-excitation resistance resistance is 56.0.
Exit the 1st, 2 section for 49th time and drop into the 3rd section, now de-excitation resistance resistance is 57.0.
Drop into the 1st section 50th time, now de-excitation resistance resistance is 58.0.
Exit the 1st section for 51st time and drop into the 2nd section, now de-excitation resistance resistance is 59.0.
Drop into the 1st section 52nd time, now de-excitation resistance resistance is 60.0.
Above two examples of lifting all are supposed to inscribe when all, newly drop into 1 section of resistance and all will the voltage of excitation winding be made to reach a certain preset value (such as 6 times of rated excitation voltages) at every turn.
Claims (6)
1. a generator quick de-excitation structure, it comprises field rectifier, field rectifier connects excitation winding, the corresponding generator of excitation winding, field suppression switch and de-excitation resistance is provided with between field rectifier and excitation winding, it is characterized in that, this de-excitation resistance is all linear resistance, this de-excitation resistance subsection setup, it is at least connected by two groups of linear resistances, and one of them linear resistance is canned paragraph resistance, and other resistance is change section resistance, each change section resistance two ends connects throwing and backs out pass, and adjacent throwing is backed out pass and is connected.
2. generator quick de-excitation structure as claimed in claim 1, it is characterized in that, this change section resistance is more than two, and the resistance of each change section resistance is not identical.
3. generator quick de-excitation structure as claimed in claim 1 or 2, is characterized in that, the resistance of change section resistance is the multiple of canned paragraph resistance.
4. generator quick de-excitation structure as claimed in claim 1, is characterized in that, this throwing is backed out and closed as circuit breaker, contactor or IGBT.
5. a generator quick de-excitation method, it is characterized in that, use a kind of generator quick de-excitation structure, it comprises field rectifier, field rectifier connects excitation winding, the corresponding generator of excitation winding, field suppression switch and de-excitation resistance is provided with between field rectifier and excitation winding, this de-excitation resistance is all linear resistance, this de-excitation resistance subsection setup, it has two groups of linear resistance series connection at least, one of them linear resistance is canned paragraph resistance, other resistance is change section resistance, each change section resistance two ends connects throwing and backs out pass, adjacent throwing is backed out pass and is connected,
Drop into the de-excitation resistance of any section according to demand when needing eliminating magnetism of generator.
6. generator quick de-excitation method as claimed in claim 5, is characterized in that, after loop current takes effect, can exit the de-excitation resistance dropped into, and drop into other de-excitation resistances, until all de-excitation resistance all drops into.
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| CN105305906B (en) | 2018-05-29 |
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Address after: 100120 Beijing city Xicheng District Street No. 24 Applicant after: NORTH CHINA POWER ENGINEERING CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP Address before: 100120 Beijing city Xicheng District Street No. 24 Applicant before: North China Electric Power Design Institute of China Power Engineering Consulting Group Corporation |
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