CN104360157B - Transformer interval breaker closing phase detection method - Google Patents
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- CN104360157B CN104360157B CN201410643768.0A CN201410643768A CN104360157B CN 104360157 B CN104360157 B CN 104360157B CN 201410643768 A CN201410643768 A CN 201410643768A CN 104360157 B CN104360157 B CN 104360157B
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000000819 phase cycle Methods 0.000 claims abstract description 7
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 abstract description 5
- 230000005284 excitation Effects 0.000 description 9
- 230000009466 transformation Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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Abstract
The invention discloses a transformer interval breaker closing phase detection method. According to the method, when closing of the first phase of a transformer interval breaker is successful, the effective value of the voltage across the phase is increased obviously. Meanwhile, due to the influence of a transformer delta winding, voltage is also generated on the other two phases, and the voltage instantaneous values are the same and are about equal to half of the first-closing phase. Accordingly, the phase sequence of the first-closing phase and the closing moment of the first-closing phase can be judged precisely. When a second-closing phase of the breaker is closed successfully, the voltage of the two closed phases are constrained by the voltage of a system and affected by the delta winding, and the voltage of the three phases of a transformer are approximate to balance. The voltage of the second-closing phase is not equal to the voltage of a last-closing phase any more. According to principle, the closing moment of the second-closing phase can be judged precisely. By means of the transformer interval breaker closing phase detection method, only the interval voltage recording data of the transformer is needed, the closing phase positions of the three phases of the breaker can be judged precisely, and the problem that by means of the prior art, the high-pressure transformer interval breaker closing phase detection cannot be achieved is solved.
Description
Technical field
The present invention relates to electrical distribution field, more particularly, to a kind of detection method is and in particular to a kind of measure a voltage
The method at the phase angle between the phase angle and an electric current between or voltage or between electric current.
Background technology
In power system when no-load transformer closing operation, transformer can inject excitation surge current in system.
Analysis shows, the excitation surge current of transformer injection is up to 6 ~ 8 times of rated current under normal circumstances.Excitation surge current pair for a long time
The impact of relay protection is of great interest.However, excitation surge current does not merely show to machine to the harm of system
In the impact of electric protection.Excitation surge current itself contains abundant harmonic component, and the quality of power supply of power system can be caused seriously
Pollution.Particularly in power grid construction initial stage or fault recovery phase, electrical network inherently has the weak contact of long transmission line, light load
Characteristic, the inductance capacitance in system is interval close to the resonance of low-order harmonic.Now, the injection of excitation surge current is likely in electrical network
End produces larger harmonic voltage, thus leading to the aberration rate of system end voltage substantially to increase, or even overvoltage.
In order to cause harmonic voltage distortion risk to be analyzed excitation surge current in power system it is necessary to analyze transformation first
The feature of device excitation surge current.Size and substation transformer due to excitation surge current are spaced the tight phase of switching-on phase of breaker
Close, therefore how by recorded wave file, transformer bay to be carried out every breaker switching-on phase detecting becoming in this area
Key subject.
Chinese patent application cn 103344830a discloses a kind of new switching-on phase detection method, a kind of new combined floodgate
Method for detecting phases.But above method is mainly used in relay-protection tester detection technique field, but consider high voltage variable
The feature at depressor interval, the method is simultaneously inapplicable.First, hot stand-by duty, transformer bay are entered when substation transformer is spaced
Every meeting, the voltage of number kv is occurred due to breaker port Capacitance Coupled, the method monitored using zero crossing is it is impossible to correct judge
Closing moment.Secondly, transformer belongs to three-phase element, because three-phase breaker can not possibly close a floodgate simultaneously, when one mutually closes a floodgate, separately
Outer two meet produces voltage due to the coupling of △ winding, affects the judgement of another two-phase closing moment.
Content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, provides one kind to detect transformation using voltage recorder data
The method that device is spaced breaker closing phase place.
The purpose of the present invention is achieved through the following technical solutions:
A kind of detection transformer bay every breaker switching-on phase method, comprise the following steps "
Step a: obtain transformer bay every voltage recorder data, according to voltage recorder data by transformer bay every three-phase electricity
The instantaneous value of pressure is recorded as respectively、With；
Step b: when transformer is in hot stand-by duty, be spaced induced voltage using voltage recorder data calculating transformer
Peak value；
Wherein:WithMomentInstantaneous value equal it may be assumed that
；
MomentMeet following conditions:
Wherein,For a phase voltageDerivative to time t；
Step c: according toSetting voltage threshold value；
Step d: the moment in recording voltage recorder data、With；
According to voltage recorder data,、WithMeet respectively、、
It is more than first, that is, meet:
WhenWhen,, and work asWhen；
WhenWhen,, and work asWhen；
WhenWhen,, and work asWhen；
Step e: calculate the first closing time closing phase；
Step f: judge first conjunction phase phase sequence, concrete grammar is as follows:
?Interior, if, first conjunction be mutually c phase；If, first conjunction be mutually b phase；If, first conjunction be mutually a phase；
Wherein,Represent the breaker three-phase minimum non-synchronous time,Represent judgment threshold；
Step g: the non-first instantaneous voltage closing phase in three-phase records respectively by transformer bay according to voltage recorder data
ForWith；
Moment in recording voltage recorder data,MeetFirst
It is more than, that is, meet: whenWhen,, and work asWhen；
Wherein:
Represent time closing moment of conjunction phase；
Step h: calculate the closing moment of a, b, c three-phase、、；
When closing phase headed by a,、、；
When closing phase headed by b,、、；
When closing phase headed by c,、、；
Step i: according to voltage recorder data, after recording breaker closing and voltage stabilization、、's
Zero-acrross ing moment、、；
、、Meet respectively:
；
；
；
Wherein,Represent time delay；
Step j: calculate the switching-on phase of breaker three-phase using below equation respectively、、；
φa=360-mod(((taz-tac)/0.02)*360,360);
φb=360-mod(((tbz-tbc)/0.02)*360,360);
φc=360-mod(((tcz-tcc)/0.02)*360,360)；
Wherein, mod (a, b) represents that a and b does the remainder after division arithmetic.
Further, in described step c, described voltage threshold.
Further, in described step f, described.
Further, in described step f, described, whereinFor rated voltage.
Further, in described step i, describedFor avoiding combined floodgate transient voltage disturbing influence result of calculation to introduce
Time delay.
Further, described.
Cardinal principle of the present invention is as follows:
(1) when transformer bay is every breaker the first phase closing success, the voltage effective value in this phase will substantially increase, far
Exceed well over the virtual value of induced voltage before combined floodgate.Simultaneously as the impact of transformer △ winding, in addition electricity is also occurred on two-phase
Pressure, and instantaneous voltage is equal, approximates the first half closing phase voltage.First conjunction phase phase can be accurately judged to according to this principle
Sequence, and first conjunction phase closing moment.
(2) after breaker time closes phase closing success, the two-phase voltage closed a floodgate is clamped down on by system voltage, is subject to simultaneously
The impact of △ winding, Three-Phase Transformer voltage approximate equilibrium.Secondary conjunction phase voltage is no longer equal with end conjunction phase voltage.Former according to this
Reason, can be accurately judged to time closing moment of conjunction phase.Because, for Inrush Calculation, phase closing moment is closed to knot in end
Really affect less, it is taken as that secondary conjunction is identical with end conjunction phase closing moment.
Advantages of the present invention and having the beneficial effects that:
Present invention only requires transformer bay every voltage recorder data, you can accurately judge the combined floodgate of breaker three-phase
Phase place, solves the problems, such as that prior art is not used to high-tension transformer interval breaker closing phase-detection.
Brief description
In order to be illustrated more clearly that embodiments of the invention, will use to required in the description embodiment of the present invention below
Accompanying drawing is briefly described.It will be apparent that drawings in the following description are only some embodiments described in the present invention, right
For those skilled in the art, in the case of not paying creative work, it can also be obtained according to figure below
Its accompanying drawing.
Fig. 1 is certain 500kv substation transformer interval voltage recorder data chart in the embodiment of the present invention.
Specific embodiment
In order that those skilled in the art more fully understands the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention
Clear, complete description is carried out to the technical scheme in the embodiment of the present invention.It will be apparent that embodiment described below is only
It is the part in the embodiment of the present invention, rather than all.The embodiment recorded based on the present invention, those skilled in the art are not
The all embodiments of other obtaining in the case of paying creative work, all in the scope of protection of the invention.
Embodiment 1:
Fig. 1 is certain 500kv substation transformer interval voltage recorder data chart, horizontal axis representing time in Fig. 1, longitudinal axis table
Show voltage.
It should be noted that closing phase headed by the phase sequence abbreviation of three-phase breaker combined floodgate first, three-phase breaker second closes a floodgate
Phase sequence referred to as time close phase, phase is closed at the last phase sequence closed a floodgate of three-phase breaker referred to as end.
Also, it should be noted for Inrush Calculation, phase closing moment is closed on result impact less in end, therefore
Think that time conjunction is identical with end conjunction phase closing moment.
A kind of detection transformer bay, every the method for breaker switching-on phase, comprises the following steps:
Step a: obtain transformer bay as shown in Figure 1 every voltage recorder data, according to voltage recorder data by transformation
The instantaneous value that device is spaced three-phase voltage is recorded as respectively、With.
Step b: (i.e. interval isolation switch has closed but the still off shape of breaker when transformer is in hot stand-by duty
State) when, it is spaced the peak value of induced voltage using voltage recorder data calculating transformer.
Wherein:WithMomentInstantaneous value equal it may be assumed that
；
MomentMeet following conditions:
Wherein,For a phase voltageDerivative to time t；
It is calculated.
Step c: according toSetting voltage threshold value.
Voltage thresholdDetermination method be to makeIt is slightly larger thanAnd leave certain nargin, take herein.
Step d: the moment in recording voltage recorder data、With；
According to voltage recorder data,、WithMeet respectively、、
It is more than first, that is, meet:
WhenWhen,, and work asWhen；
WhenWhen,, and work asWhen；
WhenWhen,, and work asWhen；
Voltage recorder data chart according to Fig. 1, can obtain、
、.
Step e: calculate the first closing time closing phase.
Step f: judge first conjunction phase phase sequence, concrete grammar is as follows:
?Interior, if, first conjunction be mutually c phase；If, first conjunction be mutually b phase；If, first conjunction be mutually a phase；
Wherein,Represent the breaker three-phase minimum non-synchronous time,Represent judgment threshold；
,,For rated voltage,,WithTake
It is worth for empirical value.
In the present embodiment,, voltage recorder data chart according to Fig. 1,, it can thus be appreciated that first conjunction is mutually a phase.
Step g: the non-first instantaneous voltage closing phase in three-phase records respectively by transformer bay according to voltage recorder data
ForWith；
Moment in recording voltage recorder data,MeetFirst
Secondary it is more than, that is, meet: whenWhen,, and work as
When；
Wherein:
Represent time closing moment of conjunction phase；
Voltage recorder data chart according to Fig. 1,.
Step h: calculate the closing moment of a, b, c three-phase、、；
When closing phase headed by a,、、；
When closing phase headed by b,、、；
When closing phase headed by c,、、；
In the present embodiment, first conjunction is mutually a phase, can be drawn according to above-mentioned formula、
、.
Step i: according to voltage recorder data, after recording breaker closing and voltage stabilization、、's
Zero-acrross ing moment、、；
、、Meet respectively:
；
；
；
Wherein,The time delay introducing for avoiding combined floodgate transient voltage disturbing influence result of calculation,,Value be empirical value.
Voltage recorder data chart according to Fig. 1,、、.
Step j: calculate the switching-on phase of breaker three-phase using below equation respectively、、；
φa=360-mod(((taz-tac)/0.02)*360,360);
φb=360-mod(((tbz-tbc)/0.02)*360,360);
φc=360-mod(((tcz-tcc)/0.02)*360,360)；
Wherein, mod (a, b) represents that a and b does the remainder after division arithmetic.
Be can get using above-mentioned formula,,.
So can get the switching-on phase every breaker for the transformer bay.
As described above, just can preferably realize the present invention.
Claims (6)
1. a kind of detection transformer bay every breaker switching-on phase method it is characterised in that comprising the following steps:
Step a: obtain transformer bay every voltage recorder data, according to voltage recorder data by transformer bay every three-phase voltage
Instantaneous value is recorded as respectively、With；
Step b: when transformer is in hot stand-by duty, be spaced the peak of induced voltage using voltage recorder data calculating transformer
Value；
Wherein:WithMomentInstantaneous value equal it may be assumed that
；
MomentMeet following conditions:
Wherein,For a phase voltageDerivative to time t；
Step c: according toSetting voltage threshold value；
Step d: the moment in recording voltage recorder data、With；
According to voltage recorder data,、WithMeet respectively、、It is more than first, that is, meet:
WhenWhen,, and work asWhen；
WhenWhen,, and work asWhen；
WhenWhen,, and work asWhen；
Step e: calculate the first closing moment closing phase；
Step f: judge first conjunction phase phase sequence, concrete grammar is as follows:
?Interior, if, first conjunction be mutually c phase；If, first conjunction be mutually b phase；If, first conjunction be mutually a phase；
Wherein,Represent the breaker three-phase minimum non-synchronous time,Represent judgment threshold；
Step g: the non-first instantaneous voltage closing phase in three-phase voltage instantaneous value divides by transformer bay according to voltage recorder data
It is not recorded asWith；
Moment in recording voltage recorder data,MeetBig first
In, that is, meet: whenWhen,, and work asWhen；
Wherein:
Represent time closing moment of conjunction phase；
Step h: calculate the closing moment of a, b, c three-phase、、；
When closing phase headed by a,、、；
When closing phase headed by b,、、；
When closing phase headed by c,、、；
Step i: according to voltage recorder data, after recording breaker closing and voltage stabilization、、Zero passage
Moment、、；
、、Meet respectively:
；
；
；
Wherein,Represent time delay；
Step j: calculate the switching-on phase of breaker three-phase using below equation respectively、、；
φa=360-mod(((taz-tac)/0.02)*360,360);
φb=360-mod(((tbz-tbc)/0.02)*360,360);
φc=360-mod(((tcz-tcc)/0.02)*360,360)；
Wherein, mod (a, b) represents that a and b does the remainder after division arithmetic.
2. according to claim 1 a kind of detection transformer bay every breaker switching-on phase method it is characterised in that:
In described step c, described voltage threshold.
3. according to claim 1 a kind of detection transformer bay every breaker switching-on phase method it is characterised in that:
In described step f, described.
4. according to claim 1 a kind of detection transformer bay every breaker switching-on phase method it is characterised in that:
In described step f, described, whereinFor rated voltage.
5. according to claim 1 a kind of detection transformer bay every breaker switching-on phase method it is characterised in that:
In described step i, describedThe time delay introducing for avoiding combined floodgate transient voltage disturbing influence result of calculation.
6. according to claim 5 a kind of detection transformer bay every breaker switching-on phase method it is characterised in that:
Described.
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| CN113991606B (en) * | 2021-10-18 | 2024-01-02 | 国电南瑞科技股份有限公司 | Excitation surge current misoperation prevention method and device for transformer |
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| CN101595390B (en) * | 2007-03-30 | 2012-11-07 | 三菱电机株式会社 | Synchronous phasor measuring device and inter-bus phase angle difference measuring device employing it |
| CN101431229B (en) * | 2008-12-05 | 2010-09-15 | 浙江省电力公司 | Asynchronous switch-on protection method for generator set |
| CN102315045B (en) * | 2010-07-06 | 2014-07-23 | 南京南瑞继保电气有限公司 | Self-learning switching-on phase control method |
| CN103840470B (en) * | 2012-11-21 | 2016-03-23 | 华北电力科学研究院有限责任公司 | A kind of breaker closing phase control method, Apparatus and system |
| CN103344830B (en) * | 2013-05-30 | 2015-11-18 | 国家电网公司 | A kind of switching-on phase detection method |
| CN103545133A (en) * | 2013-09-27 | 2014-01-29 | 国家电网公司 | High-voltage alternating-current phased circuit breaker and control method of switching on/off phase selection |
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