CN104215897B - Method for determining incomplete phase of circuit breaker by using phase difference between port voltages - Google Patents
Method for determining incomplete phase of circuit breaker by using phase difference between port voltages Download PDFInfo
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- CN104215897B CN104215897B CN201310209778.9A CN201310209778A CN104215897B CN 104215897 B CN104215897 B CN 104215897B CN 201310209778 A CN201310209778 A CN 201310209778A CN 104215897 B CN104215897 B CN 104215897B
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Abstract
The invention discloses a method for determining incomplete phase of a circuit breaker by using phase difference between port voltages. The method comprises the following steps of measuring three-phase voltages on two sides of the circuit breaker by using a circuit breaker protecting device; respectively calculating fundamental wave phase difference between voltages on two sides of the circuit breaker and effective values; determining the incomplete phase of the circuit breaker when the phase voltages on the two sides of the circuit breaker are greater than nominal voltage by 80%-90% and the port voltage of a certain phase or the phase difference between the port voltages of the two phases is greater than a set angle; and alarming or tripping after a short delayed time (t). By the method, the problem that the traditional negative-sequence current criterion cannot identify incomplete phase during incomplete phase of the circuit breaker under the condition of light load can be solved. Moreover, the method is suitable for a three-phase linkage circuit breaker without the aid of a joint with three different phases.
Description
Technical field
The invention belongs to field of relay protection in power, more particularly to judges disconnected using the phase contrast between port voltage
The method and corresponding protective relaying device or monitoring device of road device non-three phase.
Background technology
At present, live wide variety of chopper non-whole phase protection is typically by unbalanced three-phase lines contact and negative sequence current criterion
Collectively form, when light running operating mode, due to phase current very little, negative-sequence current very little during chopper non-three phase, it is difficult to exceed
Negative-sequence current definite value, it is impossible to judge chopper non-three phase.Electromotor generator terminal chopper is generally three-phase ganged, does not provide three-phase not
Consistent contact, it is impossible to using traditional non-whole phase protection, scene repeatedly occurred the fracture of the phase pull bar of generator terminal chopper one cause it is non-complete
The accident of phase, due to without non-whole phase protection, causing unit to bear negative-sequence current for a long time；Therefore, the safety of electromotor is constituted
Threaten, need a kind of non-whole phase protection for not relying on unbalanced three-phase lines contact.In view of conventional circuit breaker non-whole phase protection is present
More than it is not enough, it is necessary to study a kind of electromotor generator terminal chopper for being independent of negative-sequence current size and unbalanced three-phase lines contact
Non-three phase method of discrimination.
The content of the invention
The main object of the present invention：A kind of phase contrast between utilization port voltage is provided and judges electromotor generator terminal chopper
Non-three phase method of discrimination, is independent of negative-sequence current size, solves the method that chopper occurs non-three phase during underloading, solves in the past negative
The problem of sequence electric current criterion None- identified, additionally, the inventive method is also solved due to not needing chopper unbalanced three-phase lines contact
In the non-three phase discrimination of three-phase ganged chopper.
The technical solution adopted in the present invention is：Judge the side of chopper non-three phase using the phase contrast between port voltage
Method, the three-phase voltage of protection device for circuit breaker measurement chopper both sides；The fundamental phase for calculating chopper both sides voltage respectively is poor
And virtual value, when chopper both sides phase voltage is all higher than 80%～90% rated voltage, and a certain phase or biphase port electricity
When pressure phase contrast is more than set angle, chopper non-three phase is judged to, reports to the police or trip through short time delay t.
The method for judging non-three phase in particular for electromotor generator terminal chopper of the invention.
The three-phase voltage of protector measuring chopper both sides, both sides three-phase voltage takes from the three-phase voltage of chopper both sides
Transformer (TV).
Further, if meeting the arbitrary criterion in following formula (1)～formula (3), non-three phase is judged to, through short time delay
T protection device for circuit breaker is reported to the police or is tripped.
Chopper A phase non-three phase criterions are：
Wherein, Ua.AM、UA.AMRespectively M sides and N sides A phase voltage amplitudes, UφNFor specified phase voltage, Δ θaFor M sides and N sides
A phase voltage phase contrasts, Δ θbFor M sides and N sides B phase voltage phase contrasts, Δ θcFor M sides and N sides C phase voltage phase contrasts, Δ θsetFor
Phase contrast definite value, η typically takes 80～90, min and represents the minima for taking two values.
Chopper B phase non-three phase criterions are：
Wherein, Ub.AM、UB.AMRespectively M sides and N sides B phase voltage amplitudes.
Chopper C phase non-three phase criterions are：
Wherein, Uc.AM、UC.AMRespectively M sides and N sides C phase voltage amplitudes.
The fundamental voltage amplitude of chopper both sides three-phase voltage, phase angle and phase contrast adopt all-round fourier algorithm.
The fundamental voltage amplitude and phase angle computing formula of chopper both sides voltage transformer TV phase voltages is as follows：
Wherein, N is the sampling number of protection device each power frequency period, Uφ.Re, Uφ.ImThe respectively fundamental wave phase of phase voltage
The real part and imaginary part of amount, Uφ.AMFor the fundamental voltage amplitude of phase voltage, θφFor the fundamental wave phase angle of phase voltage, arg represents the phase angle of phasor.
Phase contrast between chopper two sides TV three-phase voltage is：
Wherein, Δ θa、ΔθbWith Δ θcRespectively three-phase port voltage phase difference, θa.M、θb.MAnd θc.MRespectively M sides three-phase
The phase angle of voltage, θa.N、θb.NAnd θc.NThe respectively phase angle of N sides three-phase voltage.
Further, phase contrast definite value Δ θsetCan in the range of 1 °～5 ° value.
Further, through short time delay t actions in reporting to the police or tripping, the short time delay definite value can be in 0.1～10s scopes for protection
Interior value.
Theory analysis shows, during chopper non-three phase, certain phase contrast can be produced between the voltage of chopper both sides, because
This, judges that the phase contrast between the phase voltage of chopper both sides can determine whether non-three phase.The three of protector measuring chopper both sides
Phase voltage；The phase contrast and virtual value of chopper both sides voltage are calculated respectively, when both sides phase voltage is all higher than 80%～90% volume
When determining voltage, and a certain phase or biphase port voltage phase contrast more than set angle, chopper non-three phase is judged to, through short
Time delay t actions are in warning or trip.
The invention has the beneficial effects as follows：The size of electric current need not be judged, chopper occurs non-three phase when solving underloading,
The problem of traditional negative sequence current criterion None- identified non-three phase；Due to unbalanced three-phase lines contact need not be judged, it is equally applicable to
The chopper of three-phase ganged, and conventional non-whole phase protection method cannot judge three-phase ganged chopper non-three phase.
Description of the drawings
Port both sides three-phase voltage instrumentation plan when Fig. 1 is chopper non-three phase in the present invention, in figure G be electromotor, S
For Infinite bus system, L is circuit, and m and n is chopper A phases port, TVMFor the voltage transformer of chopper M sides, TVNFor open circuit
The voltage transformer of device N sides, Ua、UbAnd UcFor the three-phase voltage of M sides, UA、UBAnd UCFor the three-phase voltage of N sides.
Specific embodiment
Technical scheme is described in detail below with reference to accompanying drawing.
In FIG, both sides three-phase voltage is measured respectively from the TV of breaker port both sides, using all-round fourier algorithm meter
Calculate positive sequence voltage and the phase angle of both sides voltage.
The fundamental voltage amplitude and phase angle computing formula of two sides TV phase voltage is as follows：
Wherein, N is the sampling number of protection device each power frequency period, Uφ.Re, Uφ.ImThe respectively fundamental wave phase of phase voltage
The real part and imaginary part of amount, Uφ.AMFor the fundamental voltage amplitude of phase voltage, θφFor the fundamental wave phase angle of phase voltage, arg represents the phase for seeking phasor
Angle.
The phase contrast of two sides TV three-phase voltage is：
Wherein, Δ θa、ΔθbWith Δ θcRespectively three-phase port voltage phase difference, θa.M、θb.MAnd θc.MRespectively M sides three-phase
The phase angle of voltage, θa.N、θb.NAnd θc.NThe respectively phase angle of N sides three-phase voltage.
Chopper A phase non-three phase criterions are：
Wherein, Ua.AM、UA.AMRespectively M sides and N sides A phase voltage amplitudes, UφNFor specified phase voltage, Δ θaFor M sides and N sides
A phase voltage phase contrasts, Δ θbFor M sides and N sides B phase voltage phase contrasts, Δ θcFor M sides and N sides C phase voltage phase contrasts, Δ θsetFor
Phase contrast definite value, typically takes 1 °～5 °, and η typically takes 80～90, min and represents the minima for taking two values.
Chopper B phase non-three phase criterions are：
Wherein, Ub.AM、UB.AMRespectively M sides and N sides B phase voltage amplitudes.
Chopper C phase non-three phase criterions are：
Wherein, Uc.AM、UC.AMRespectively M sides and N sides C phase voltage amplitudes.
If meeting the either condition of formula (3)～formula (5), the short time delay t protection acts of Jing are in warning or trip, the short time delay
Definite value value typically in the range of 0.1～10s.
Above example technological thought only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any equivalent done on the basis of technical scheme or change, without departing from this
Invention protection domain.
Claims (7)
1. the method for judging chopper non-three phase using the phase contrast between port voltage, is characterized in that：Protection device for circuit breaker
The three-phase voltage of measurement chopper both sides；The fundamental phase difference and virtual value of chopper both sides voltage are calculated respectively, work as chopper
Both sides phase voltage is all higher than 80%～90% rated voltage, and a certain phase or biphase port voltage phase contrast are more than set angle
When spending, chopper non-three phase is judged to, reports to the police or trip through short time delay t.
2. the method that the phase contrast using between port voltage as claimed in claim 1 judges chopper non-three phase, its feature
It is：The three-phase voltage of protector measuring chopper both sides, the three-phase voltage that both sides three-phase voltage takes from chopper both sides is mutual
Sensor TV.
3. the method that the phase contrast using between port voltage as claimed in claim 2 judges chopper non-three phase, its feature
It is：If meeting the arbitrary criterion in following formula (1)～formula (3), non-three phase is judged to, reports to the police or trip through short time delay t；
Chopper A phase non-three phase criterions are：
Wherein, Ua.AM、UA.AMRespectively M sides and N sides A phase voltage amplitudes, UφNFor specified phase voltage, Δ θaFor M sides and N sides A phase electricity
Pressure phase contrast, Δ θbFor M sides and N sides B phase voltage phase contrasts, Δ θcFor M sides and N sides C phase voltage phase contrasts, Δ θsetFor phase contrast
Definite value, η takes 80～90, min and represents the minima for taking two values；
Chopper B phase non-three phase criterions are：
Wherein, Ub.AM、UB.AMRespectively M sides and N sides B phase voltage amplitudes；
Chopper C phase non-three phase criterions are：
Wherein, Uc.AM、UC.AMRespectively M sides and N sides C phase voltage amplitudes.
4. the method that the phase contrast using between port voltage as claimed in claim 1 or 2 judges chopper non-three phase, it is special
Levy and be：The fundamental voltage amplitude of chopper both sides three-phase voltage, phase angle and phase contrast adopt all-round fourier algorithm：
The fundamental voltage amplitude and phase angle computing formula of two sides TV phase voltage is as follows：
Wherein, N is the sampling number of protection device each power frequency period, Uφ.Re, Uφ.ImThe respectively fundamental phasors of phase voltage
Real part and imaginary part, Uφ.AMFor the fundamental voltage amplitude of phase voltage, θφFor the fundamental wave phase angle of phase voltage, arg represents the phase angle of phasor.
5. the method that the phase contrast using between port voltage as claimed in claim 1 or 2 judges chopper non-three phase, it is special
Levy and be：Phase contrast between chopper two sides TV three-phase voltage is：
Wherein, Δ θa、ΔθbWith Δ θcRespectively three-phase port voltage phase difference, θa.M、θb.MAnd θc.MRespectively M sides three-phase electricity
The phase angle of pressure, θa.N、θb.NAnd θc.NThe respectively phase angle of N sides three-phase voltage.
6. the method that the phase contrast using between port voltage as claimed in claim 1 or 2 judges chopper non-three phase, it is special
Levy and be：Phase contrast definite value Δ θsetThe value in the range of 1 °～5 °.
7. the method that the phase contrast using between port voltage as claimed in claim 1 or 2 judges chopper non-three phase, it is special
Levy and be：Protection is through short time delay t actions in warning or tripping operation, short time delay definite value value in the range of 0.1～10s.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795801B (en) * | 2015-04-29 | 2018-02-16 | 南京南瑞继保电气有限公司 | A kind of breaker non-three phase method of discrimination and device based on voltage |
| CN105762770B (en) * | 2015-12-17 | 2018-01-30 | 广东蓄能发电有限公司 | Breaker non-three phase determination methods based on both sides voltage fundamental amplitude change rate |
| CN105762771B (en) * | 2015-12-17 | 2018-06-22 | 广东蓄能发电有限公司 | Breaker non-three phase judgment method based on both sides voltage fundamental amplitude ratio |
| CN110018347A (en) * | 2019-04-12 | 2019-07-16 | 江南大学 | A kind of novel transformer phase Difference Measuring System and its measurement method |
| CN112684289B (en) * | 2020-12-15 | 2022-08-09 | 上海思源弘瑞自动化有限公司 | Non-full-phase operation state identification method and device, electrical protection equipment and medium |
| CN113341228A (en) * | 2021-04-25 | 2021-09-03 | 广东电网有限责任公司广州供电局 | Voltage phase difference processing method and device, electronic equipment and storage medium |
| CN113655377B (en) * | 2021-06-28 | 2023-11-03 | 国网新源控股有限公司 | Breaker failure fault detection method and device for pumped storage generator motor |
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| CN1082261A (en) * | 1993-05-31 | 1994-02-16 | 李养善 | Make the single-pole reclosing of criterion with non-full phase voltage |
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