CN104300498B - Transformer magnetizing inrush current restraining and differential protection matching method - Google Patents
Transformer magnetizing inrush current restraining and differential protection matching method Download PDFInfo
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- CN104300498B CN104300498B CN201410568440.7A CN201410568440A CN104300498B CN 104300498 B CN104300498 B CN 104300498B CN 201410568440 A CN201410568440 A CN 201410568440A CN 104300498 B CN104300498 B CN 104300498B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000000452 restraining effect Effects 0.000 title claims abstract description 9
- 230000001629 suppression Effects 0.000 claims description 37
- 230000005284 excitation Effects 0.000 claims description 33
- 238000004422 calculation algorithm Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000005764 inhibitory process Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000011162 core material Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005094 computer simulation Methods 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention discloses a transformer magnetizing inrush current restraining and differential protection matching method. The method comprises the following steps of S01 switch closing time self-learning, S02 switch opening information recording, S03 calculation of a voltage phase angle alpha generated at the opening moment, S04 calculation of a voltage phase angle generated at the switch closing triggering moment, S05 closing execution, S06 calculation of an A-phase voltage phase angle gamma generated at the switch closing moment and S07 inrush current latching adjustment, wherein in the S07, inrush current logic adjustment is conducted according to the inrush current restraining effect. According to the transformer magnetizing inrush current restraining and differential protection matching method, the magnetizing inrush current restraining effect of current closing can be evaluated according to the phase angle at the actual switch closing moment and an optimal closing phase angle worked out theoretically, differential protection inrush current latching criteria can be adjusted according to the restraining effect, and the reliability and the sensitivity of transformer differential protection can be improved easily.
Description
Technical field
The present invention relates to power system automation technology field, and in particular to a kind of transformer excitation flow suppress with it is differential
The method of protection cooperation.
Background technology
When transformer during no-load closing moment, due to transformer core magnetic flux saturation, the presence of relict flux and iron core material
The nonlinear characteristic of material, can produce the sizable excitation surge current of amplitude, reach steady statue through the transient process of several weeks ripple, this
The switching current of individual impact often up to rated current 6-8 times.In addition, the excitation surge current will cause this regional voltage again
Fluctuation, causes the change with the transformer magnetizing current of its paired running, that is, produce and echo surge current.Thus it is likely to result in transformator
Differential protection misoperation, transformer insulated damage, winding deformation, while reducing power system power supply quality.
As excitation surge current is usually the peaked wave for being partial to coordinate axess side, and contain substantial amounts of harmonic component, therefore
In order to prevent excitation surge current from causing differential protection malfunction, transformer differential protection generally adopts excitation surge current locking criterion, and such as two
Subharmonic braking, waveform symmetry, interrupted angle principle etc..It is whole that the outstanding problem that these locking criterions are present is that restraint coefficient is difficult
It is fixed, too high false protection when transformator can be caused to drop of adjusting, adjusting too low can cause transformator to be protected when dropping the failure between lock
Shield tripping, reduces reliability and the sensitivity of differential protection, has when such phenomenon is in actual motion and dynamic simulation experiment
Occur.
In prior art, the scholars of power industry expand deep grinding for the method that transformer excitation flow suppresses
Study carefully, and propose various surge suppression methods, wherein phase selection position combined floodgate suppresses the method for excitation surge current due to low cost, Yi Shi
It is existing, progressively become the focus of research.The ultimate principle that phase selection position is closed a floodgate is to select appropriate voltage according to the information of last time separating brake
Phase angle is closed a floodgate, but as precision of fuzzy controller and operating mechanism have dispersion movement time, therefore it is difficult to ensure that open
The actual closing phase angle in pass is essentially equal with the phase angle that Theoretical Calculation goes out, and its error directly determines the inhibition of excitation surge current.
The content of the invention
The present invention proposes that a kind of transformer excitation flow suppresses the method coordinated with differential protection, can be actual according to switch
The error of the optimal closing phase angle that the phase angle of closing moment is gone out with Theoretical Calculation, the excitation surge current for assessing this combined floodgate suppress effect
Really, and adjust differential protection according to inhibition to shove locking criterion, be conducive to improving the reliability of transformer differential protection and
Sensitivity.
Technical solution of the present invention is as follows：
A kind of transformer excitation flow suppresses the method coordinated with differential protection, comprises the following steps,
S01, switchs closing time self study：The first time remote control combined floodgate order of remote monitoring system is received, is sent and is closed
Lock is instructed outputs module to transformer excitation flow restraining device, completes closing operation by module is outputed, gathers the position of the switch
Signal (position of the switch information when step S01 collection switch closes a floodgate), and record is issued to position of the switch closure institute from reclosing command
Take time t；This step provides corrected parameter for the amendment of closing phase angle；
S02, switchs separating brake information record：After receiving remote control separating brake order, switch performs sub-switching operation, and records switch
From the separating brake information closed when position is changed into point position, the position of the switch becomes timesharing triggering record ripple by closing, and main control module recording voltage is being switched
Conjugate the data of forward and backward each n cycle；The data of former and later two cycles are taken typically；
S03, calculates separating brake moment voltage phase angle α：According to the separating brake information of step S02 record, Jing full wave Fourier algorithm meters
The position of the switch is calculated by the phase angle α for closing variation moment A phase voltages, as three-phase voltage is symmetrical during separating brake, therefore it is electric only to take A phases
Pressure, it is also same during combined floodgate；
S04, calculates the voltage phase angle β corresponding to switch combined floodgate triggering moment：According to the switch combined floodgate institute of step S01 record
Take time t, and last time separating brake phase angle α that step S03 is calculated (the step S03 position of the switch is by closing variation moment A phase voltages
Phase angle α), calculate the phase angle beta of combined floodgate triggering moment, to guarantee to switch the phase angle of actual closing moment and the phase angle of last time separating brake
It is same or like：
This step has carried out actual correction to separating brake moment voltage phase angle α；T%20 is represented and is taken the remainder to 20, due to one
Whole period of wave is 20ms, and t%20 is used to calculate the surplus after whole period of wave；
S05, closes a floodgate and performs, when remote control combined floodgate order is received, the phase angle of real-time monitoring A phase voltage, and compare A phase voltages
When phase angle is equal with combined floodgate that step S04 is calculated triggering phase angle beta, reclosing command is sent to module is outputed, by outputing module
Complete closing operation；
Information when S06, recording step S05 close a floodgate during switch closure, then Jing full wave Fourier algorithms calculating switch closure
When A phase voltage phase angles γ；
S07, the latching logic that shoves adjustment：Latching logic adjustment of shoving is carried out according to surge suppression effect.
Specifically include following steps,
(7-a) differentiation of surge suppression effect, according to the separating brake that actual closing phase angle in step S06 is calculated with step S03
The difference that phase angle is present, differentiates the effect of surge suppression；
As 30 ° of | γ-α | ＜, surge suppression effect level is judged to A levels；
As 60 ° of 30 °≤| γ-α | ＜, surge suppression effect level is judged to B levels；
As >=60 ° of | γ-α |, surge suppression effect level is judged to C levels；
(7-b) carry out shoving the adjustment of latching logic according to surge suppression effect:Locking criterion of shoving includes second harmonic
Locking criterion and waveform symmetry locking criterion, sentence according to the rank adjusting second harmonic locking of step (7-a) surge suppression effect
According to the syntagmatic with waveform symmetry locking criterion, when the rank of surge suppression effect is A levels, using second harmonic locking with
Waveform symmetry locking and door locking, improve the susceptiveness protected when high resistance ground and turn-to-turn fault in area；When surge suppression effect
When rank is B levels, using second harmonic locking；When surge suppression effect level is C levels, using second harmonic locking and waveform
Both symmetrical locking OR gate lockings, it is ensured that the reliability of protection.
More preferably, after step S07 terminates, continue detection switch and open a sluice gate order, when receiving after opening a sluice gate order of switch,
Into step S02, enter excitation surge current next time and suppress the latching logic adjustment that calculates and shove, can realize that static exciter is gushed
Stream suppresses and the persistent loop of differential protection is acted on.
Compared with prior art, the present invention includes following beneficial effect：A kind of transformer excitation flow that the present invention is provided
The optimal combined floodgate for suppressing the method coordinated with differential protection be gone out with Theoretical Calculation according to the phase angle for switching actual closing moment
The error of phase angle, assesses the excitation surge current inhibition of this combined floodgate, and adjusts differential protection according to inhibition and shove locking
Criterion, is conducive to improving reliability and the sensitivity of transformer differential protection；The present invention is by excitation surge current inhibition and transformation
Device differential protection combines, the adjustment of the latching logic that carries out shoving according to surge suppression effect, differential protection measurement is adjusted in real time
It is whole, improve reliability and the sensitivity of transformer differential protection.
Further, excitation surge current process of inhibition of the present invention calculates combined floodgate triggering moment according to front separating brake phase angle α
Phase angle beta, while by switching required time t amendments of closing a floodgate, excitation surge current process of inhibition calculates simple, and excitation surge current suppresses accurately
Degree is high.
Description of the drawings
A kind of transformer excitation flow of Fig. 1 present invention suppresses the method flow diagram coordinated with differential protection.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention proposes a kind of method that transformer excitation flow suppresses to coordinate with differential protection, including
Following steps,
S01, switchs closing time self study：The first time remote control combined floodgate order of remote monitoring system is received, is sent and is closed
Lock is instructed outputs module to transformer excitation flow restraining device, completes closing operation by module is outputed, gathers the position of the switch
Signal, and t the time required to record is issued to position of the switch closure from reclosing command；This step is provided for the amendment of closing phase angle and is repaiied
Positive parameter；
S02, switchs separating brake information record：After receiving remote control separating brake order, switch performs sub-switching operation, and records switch
From the separating brake information closed when position is changed into point position, the position of the switch becomes timesharing triggering record ripple by closing, and main control module recording voltage is being switched
Conjugate the data of forward and backward each two cycles；
S03, calculates separating brake moment voltage phase angle α：According to the separating brake information of step S02 record, Jing full wave Fourier algorithm meters
The position of the switch is calculated by the phase angle α for closing variation moment A phase voltages, as three-phase voltage is symmetrical during separating brake, therefore it is electric only to take A phases
Pressure is also identical during combined floodgate；
S04, calculates the voltage phase angle β corresponding to switch combined floodgate triggering moment：According to the switch combined floodgate institute of step S01 record
Take time t, and the last time separating brake phase angle α that step S03 is calculated, and calculates the phase angle beta of combined floodgate triggering moment, to guarantee switch
The phase angle of actual closing moment is same or like with the phase angle of last time separating brake：
This step has carried out actual correction to separating brake moment voltage phase angle α；T%20 is represented and is taken the remainder to 20, due to one
Whole period of wave is 20ms, and t%20 is used to calculate the surplus after whole period of wave；
S05, closes a floodgate and performs, when remote control combined floodgate order is received, the phase angle of real-time monitoring A phase voltage, and compare A phase voltages
When phase angle is equal with combined floodgate that step S04 is calculated triggering phase angle beta, reclosing command is sent to module is outputed, by outputing module
Complete closing operation；
S06, record switch information during closure, and then Jing full wave Fourier algorithms calculate A phase voltage phases when switching closure
Angle γ；
S07, the latching logic that shoves adjustment：Latching logic adjustment of shoving is carried out according to surge suppression effect.
Specifically include following steps,
(7-a) differentiation of surge suppression effect, according to the separating brake that actual closing phase angle in step S06 is calculated with step S03
The difference that phase angle is present, differentiates the effect of surge suppression；
As 30 ° of | γ-α | ＜, surge suppression effect level is judged to A levels；
As 60 ° of 30 °≤| γ-α | ＜, surge suppression effect level is judged to B levels；
As >=60 ° of | γ-α |, surge suppression effect level is judged to C levels；
(7-b) carry out shoving the adjustment of latching logic according to surge suppression effect:Locking criterion of shoving includes second harmonic
Locking criterion and waveform symmetry locking criterion, sentence according to the rank adjusting second harmonic locking of step (7-a) surge suppression effect
According to the syntagmatic with waveform symmetry locking criterion, when the rank of surge suppression effect is A levels, using second harmonic locking with
Waveform symmetry locking and door locking, improve the susceptiveness protected when high resistance ground and turn-to-turn fault in area；When surge suppression effect
When rank is B levels, using second harmonic locking；When surge suppression effect level is C levels, using second harmonic locking and waveform
Both symmetrical locking OR gate lockings, it is ensured that the reliability of protection.
After step S07 terminates, that continues detection switch opens a sluice gate order, when after opening a sluice gate order of switch is received, into step
Rapid S02, enters excitation surge current next time and suppresses the latching logic adjustment that calculates and shove, can realize that transformer excitation flow suppresses
Act on the persistent loop of differential protection.
Those skilled in the art the present invention can be modified or modification design but without departing from the present invention think of
Think and scope.Therefore, if these modifications of the present invention and modification belong to the technical scope of the claims in the present invention and its equivalent
Within, then the present invention is also intended to comprising these changes and modification.
Claims (5)
1. a kind of transformer excitation flow suppresses the method coordinated with differential protection, it is characterised in that comprise the following steps,
S01, switchs closing time self study：The first time remote control combined floodgate order of remote monitoring system is received, combined floodgate is sent and is referred to
Make and output module to transformer excitation flow restraining device, closing operation is completed by module is outputed, gather switch position signal,
And record is issued to position of the switch closure required time t from reclosing command；
S02, switchs separating brake information record：After receiving remote control separating brake order, switch performs sub-switching operation, and records switch by closing
Position is changed into separating brake information during point position, and the position of the switch is become timesharing triggering and recorded ripple by closing, and recording voltage is in the forward and backward each n of switch changed position
The data of individual cycle；
S03, calculates separating brake moment voltage phase angle α：According to the separating brake information of step S02 record, Jing full wave Fourier algorithms are calculated and are opened
Off position is by the phase angle α for closing variation moment A phase voltages；
S04, calculates the voltage phase angle β corresponding to switch combined floodgate triggering moment：Closed a floodgate according to the switch of step S01 record and taken
Between the last time separating brake phase angle α that calculates of t and step S03, calculate the phase angle beta of combined floodgate triggering moment：
S05, closes a floodgate and performs, when remote control combined floodgate order is received, the phase angle of real-time monitoring A phase voltage, and compare A phase voltage phase angles
When equal with the combined floodgate triggering phase angle beta that step S04 is calculated, reclosing command is sent to module is outputed, completed by module is outputed
Closing operation；
Information during closure is switched when S06, recording step S05 close a floodgate, then Jing full wave Fourier algorithms calculate A when switching closure
Phase voltage phase angle γ；
S07, the latching logic that shoves adjustment：Latching logic adjustment of shoving is carried out according to surge suppression effect,
Specifically include following steps,
(7-a) differentiation of surge suppression effect, according to the separating brake phase that actual closing phase angle γ in step S06 is calculated with step S03
The difference that angle α is present, differentiates the effect of surge suppression；
(7-b) carry out shoving the adjustment of latching logic according to surge suppression effect:Locking criterion of shoving includes second harmonic locking
Criterion and waveform symmetry locking criterion, according to the rank adjusting second harmonic locking criterion of step (7-a) surge suppression effect and
The syntagmatic of waveform symmetry locking criterion.
2. a kind of transformer excitation flow according to claim 1 suppresses the method coordinated with differential protection, its feature to exist
In the step (7-a) differentiates that the effect of surge suppression specifically includes following steps：
As 30 ° of | γ-α | ＜, surge suppression effect level is judged to A levels；
As 60 ° of 30 °≤| γ-α | ＜, surge suppression effect level is judged to B levels；
As >=60 ° of | γ-α |, surge suppression effect level is judged to C levels.
3. a kind of transformer excitation flow according to claim 2 suppresses the method coordinated with differential protection, its feature to exist
In rank adjusting second harmonic locking criterion and waveform symmetry of the step (7-b) according to step (7-a) surge suppression effect
The syntagmatic of locking criterion, specifically includes following steps：
When the rank of surge suppression effect is A levels, using second harmonic locking and waveform symmetry locking and door locking；When suppression of shoving
When effect level processed is B levels, using second harmonic locking；When surge suppression effect level is C levels, using second harmonic locking
With both waveform symmetry lockings OR gate locking.
4. a kind of transformer excitation flow according to claim 1 suppresses the method coordinated with differential protection, its feature to exist
In data of the step S02 recording voltage in forward and backward each two cycles of switch changed position.
5. a kind of transformer excitation flow according to claim 1 suppresses the method coordinated with differential protection, its feature to exist
In, after step S07 terminates, that continues detection switch opens a sluice gate order, when after opening a sluice gate order of switch is received, into step
S02, enters excitation surge current next time and suppresses the latching logic adjustment that calculates and shove.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105449652B (en) * | 2015-12-22 | 2017-11-21 | 南京国电南自电网自动化有限公司 | A kind of positive sequence voltage phase control type excitation surge current suppressing method |
| CN111600284A (en) * | 2020-03-05 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Excitation inrush current suppression method applied to power frequency transformer in controllable inversion |
| CN112763801B (en) * | 2021-04-07 | 2021-08-06 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
| CN113805050B (en) * | 2021-08-31 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司广州局 | Phase selection closing angle monitoring method and device, computer equipment and storage medium |
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|---|---|---|---|---|
| WO2011116488A1 (en) * | 2010-03-22 | 2011-09-29 | Siemens Aktiengesellschaft | Method and apparatus for suppressing an inrush current of a trans former |
| CN103336197A (en) * | 2013-06-20 | 2013-10-02 | 国家电网公司 | Distinguishing method of inrush current blocking of transformer |
| CN103746338A (en) * | 2013-12-11 | 2014-04-23 | 西安交通大学 | Any phase-shifting angle special transformer differential protection method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011116488A1 (en) * | 2010-03-22 | 2011-09-29 | Siemens Aktiengesellschaft | Method and apparatus for suppressing an inrush current of a trans former |
| CN103336197A (en) * | 2013-06-20 | 2013-10-02 | 国家电网公司 | Distinguishing method of inrush current blocking of transformer |
| CN103746338A (en) * | 2013-12-11 | 2014-04-23 | 西安交通大学 | Any phase-shifting angle special transformer differential protection method |
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Address after: 225009 Weiyang Road, Jiangsu, China, No. 179, No. Applicant after: Yangzhou Power Supply Company of Jiangsu Electric Power Company Applicant after: Nanjing Guodian Nanjing Grid Automation Co., Ltd. Applicant after: Jiangsu Electric Power Company Applicant after: State Grid Corporation of China Address before: 100761 West Chang'an Avenue, Beijing, No. 86, No. Applicant before: State Grid Corporation of China Applicant before: Jiangsu Electric Power Company Applicant before: Yangzhou Power Supply Company of Jiangsu Electric Power Company Applicant before: Nanjing Guodian Nanjing Grid Automation Co., Ltd. |
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Inventor after: Wang Shugang Inventor after: Lu Zhonghua Inventor after: Li Peipei Inventor after: Teng Jun Inventor after: Ma Zaiquan Inventor after: Lu Shengzhi Inventor after: Wang Qi Inventor after: Hu Bing Inventor after: Chen Fufeng Inventor before: Wang Shugang Inventor before: Lu Zhonghua Inventor before: Wang Qi Inventor before: Lu Shengzhi Inventor before: Hu Bing Inventor before: Chen Fufeng |
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