CN106410764A - Positive sequence polarization voltage calculating method and device - Google Patents
Positive sequence polarization voltage calculating method and device Download PDFInfo
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- CN106410764A CN106410764A CN201610918143.XA CN201610918143A CN106410764A CN 106410764 A CN106410764 A CN 106410764A CN 201610918143 A CN201610918143 A CN 201610918143A CN 106410764 A CN106410764 A CN 106410764A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention relates to a positive sequence polarization voltage calculating method and device. The method comprises the steps that the zero sequence current component, the zero sequence voltage component and the three phase voltage amplitude of the power supply side of a Y/delta transformer single-ended power supply system are detected to determine whether the power supply side of the Y/delta transformer single-ended power supply system has a single-phase incomplete phase fault; if the power supply side of the Y/delta transformer single-ended power supply system has a single-phase incomplete phase fault, whether the amplitude of first phase current is greater than a current set threshold value is determined, wherein the first phase current is phase current corresponding to phase voltage with voltage amplitude greater than a voltage set threshold value in three-phase voltage of the power supply side of the Y/delta transformer single-ended power supply system; and if the amplitude of the first phase current is greater than the current set threshold value, the phase voltage corresponding to the first phase current is used as positive sequence polarization voltage. According to the positive sequence polarization voltage calculating method provided by the invention, the acquired positive sequence polarization voltage phase is kept constant before and after the fault occurs, which improves the effectiveness of the protection operation start of a distance protection device.
Description
Technical field
The present invention relates to technical field of relay protection, more particularly, to a kind of computational methods of positive sequence polarization voltage and device.
Background technology
Distance protection is a kind of protective relaying device, and the trouble point that this device can be reflected in transmission line of electricity and distance are protected
The distance between shield installation place, and the movement time opening protection can be determined according to the far and near of distance.The core of distance protection
Element is impedance relay, and impedance relay is used for measuring short-circuit impedance, when short-circuit impedance is less than and adjusts impedance, impedance relay
Protection opened by device.Impedance relay includes Amplitude Comparison impedance relay and phase place comparison expression impedance relay, wherein, phase place
The operation condition of comparison expression impedance relay is 90 °≤Arg (U1/U2)≤270 °, and wherein, U2 is offset voltage, is that reflection is short
Roadlock resists the running voltage with impedance comparison result of adjusting, and U1 is polarizing voltage, is the reference voltage judging U2 phase place change.
In general power system, positive sequence voltage due to possess before fault with fault after phase place keep constant characteristic, because
This is commonly used for judging the reference voltage of U2 phase place change, will positive sequence voltage as polarizing voltage.Distance protection is according to U2 phase place
Change determines whether to open protection, and wherein, when breaking down in the protection zone positive direction of distance protection, fault is if located in guarantor
Shield is then referred to as troubles inside the sample space in area, and now impedance relay should action immediately；When the protection zone in the reverse direction of distance protection occurs
During fault, then fault is directly judged to external area error, now action do not answered by impedance relay.Positive sequence voltage phase place is based on three-phase electricity
Pressure phase calculation forms, and by carrying out resolution of vectors, translation to three-phase voltage, obtains positive sequence voltage and its corresponding phase.
But, when power system is Y/ △ (Y side is mains side, △ side is load side) transformator single ended power supply system and electricity
When net system is in non-full-operating state, if mutually there is fault again, mains side non-three phase voltage magnitude in mains side other
Phase voltage amplitude is almost equal with perfecting, but phase differential larger so that being formed based on mains side three-phase voltage phase calculation
Positive sequence voltage phase place shift so that positive sequence voltage phase place has larger phase contrast with after fault before fault, lead to
In external area error it may happen that malfunction, and in troubles inside the sample space it may happen that tripping, now positive sequence voltage is no longer for distance protection
It is suitable as polarizing voltage.
Content of the invention
For overcoming problem present in correlation technique, the present invention provides a kind of computational methods of positive sequence polarization voltage and dress
Put.
According to embodiments of the present invention in a first aspect, providing a kind of computational methods of positive sequence polarization voltage, including：
By detecting zero-sequence current component, zero sequence voltage component and the three-phase of Y/ △ transformator single ended power supply system power supply side
Voltage magnitude, judges whether described Y/ △ transformator single ended power supply system power supply side occurs single-phase non-three phase fault again；
When described Y/ △ transformator single ended power supply system power supply side occurs single-phase non-three phase fault again, then judge the first phase
Whether the amplitude of electric current is more than current settings threshold value, and wherein, described first phase current is described Y/ △ transformator single ended power supply
In the three-phase voltage of system power supply side, voltage magnitude be more than voltage set threshold value the corresponding phase current of phase voltage；
If the amplitude of described first phase current is more than current settings threshold value, by corresponding for described first phase current phase
Voltage is as positive sequence polarization voltage.
Preferably, by detecting zero-sequence current component and the zero sequence electricity of described Y/ △ transformator single ended power supply system power supply side
Pressure component, judges whether single-phase non-three phase described Y/ △ transformator single ended power supply system power supply side to occur that fault includes again：
When breaking down in Y/ △ transformator single ended power supply system power supply side, then judge described Y/ △ transformator single ended power supply
System power supply side whether there is zero-sequence current component；
If described Y/ △ transformator single ended power supply system power supply side has described zero-sequence current component, judge described Y/
Whether △ transformator single ended power supply system power supply side does not have zero sequence voltage component；
If described Y/ △ transformator single ended power supply system power supply side does not have described zero sequence voltage component, judge described
In the three-phase voltage of Y/ △ transformator single ended power supply system power supply side, if the amplitude that there is two-phase voltage is more than voltage setting threshold
Value, the amplitude of another phase voltage are less than described voltage and set threshold value；
If in the mains side three-phase voltage of described Y/ △ transformator single ended power supply system, the amplitude that there is two-phase voltage is big
Set the amplitude of threshold value, another phase voltage in described voltage less than described voltage setting threshold value, then described Y/ △ transformator
There is single-phase non-three phase fault again in the mains side of single ended power supply system.
Preferably, methods described also includes：
If the amplitude of described first phase current is less than current settings threshold value, described first phase current is corresponding described
Phase voltage is non-three phase.
Preferably, methods described also includes：
Judge whether the amplitude of the second phase current is more than current settings threshold value, wherein, described second phase current is described
In the three-phase voltage of Y/ △ transformator single ended power supply system, voltage magnitude is less than the phase voltage correspondence that described voltage sets threshold value
Phase current；
If the amplitude of described second phase current is more than current settings threshold value, described second phase current is corresponding described
Phase voltage is fault phase.
Preferably, described voltage sets threshold value as the 80% of three-phase voltage rated voltage.
Second aspect according to embodiments of the present invention, also provides a kind of computing device of positive sequence polarization voltage, described device
Including:
Single-phase non-three phase breakdown judge module again：For detecting the zero sequence electricity of Y/ △ transformator single ended power supply system power supply side
Flow component, zero sequence voltage component and three-phase voltage amplitude, judge whether described Y/ △ transformator single ended power supply system power supply side is sent out
Raw single-phase non-three phase fault again；
Perfect phase judge module：For there is single-phase non-three phase again when described Y/ △ transformator single ended power supply system power supply side
During fault, then judge whether the amplitude of the first phase current is more than current settings threshold value, wherein, described first phase current is described
In the three-phase voltage of Y/ △ transformator single ended power supply system power supply side, voltage magnitude be more than voltage set threshold value phase voltage correspond to
Phase current；
Positive sequence polarization voltage output module：For when described first phase current amplitude be more than current settings threshold value when,
Then corresponding for described first phase current phase voltage is output as positive sequence polarization voltage.
Preferably, described device also includes：
Non-three phase judge module：For when the amplitude of described first phase current is less than current settings threshold value, then by institute
State the corresponding described phase voltage of the first phase current and be judged as non-three phase.
Preferably, described device also includes：
Fault phase judge module：Whether the amplitude for judging the second phase current is more than current settings threshold value, wherein, institute
State in the three-phase voltage that the second phase current is described Y/ △ transformator single ended power supply system, voltage magnitude is less than described voltage and sets
The corresponding phase current of phase voltage of threshold value；
If the amplitude of described second phase current is more than current settings threshold value, described second phase current is corresponding described
Phase voltage is judged as fault phase.
The technical scheme that embodiments of the invention provide can include following beneficial effect：Provided in an embodiment of the present invention just
The computational methods of sequence polarizing voltage, by detecting zero-sequence current component, the zero sequence of Y/ △ transformator single ended power supply system power supply side
Component of voltage and three-phase voltage, when judging to break down in Y/ △ transformator single ended power supply system power supply side, whether fault type is
Single-phase non-three phase fault again；When fault type is for single-phase non-three phase fault again, it is more than by the amplitude judging the first phase current
Current settings threshold value, wherein, the first phase current is that in the three-phase voltage of Y/ △ transformator single ended power supply system, voltage magnitude is big
Set the corresponding phase current of phase voltage of threshold value in voltage, obtaining the corresponding phase voltage of the first phase current is to perfect phase；To be good for
The voltage of full phase is as positive sequence polarization voltage.The embodiment of the present invention is in open-phase operation in Y/ △ transformator single ended power supply system
Operating mode, Y/ △ transformator single ended power supply system mains side occur non-three phase again fault when, by detect three-phase voltage voltage
Amplitude and compared with setting amplitude with voltage, detect the current amplitude of three-phase voltage and choose strong compared with current settings amplitude
Quan Xiang, using perfect phase voltage before fault with fault after phase invariant characteristic, will perfect phase voltage as positive sequence polarization electricity
Pressure, efficiently solve Y/ △ transformator single ended power supply system occur non-three phase again fault when, external area error malfunction and troubles inside the sample space
The problem of tripping.
It should be appreciated that above general description and detailed description hereinafter are only exemplary and explanatory, not
The present invention can be limited.
Brief description
Accompanying drawing herein is merged in description and constitutes the part of this specification, shows the enforcement meeting the present invention
Example, and be used for explaining the principle of the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of structural representation of Y/ △ transformator single ended power supply system provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic flow sheet of positive sequence polarization voltage computational methods provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic flow sheet judging single-phase non-three phase fault method provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of positive sequence polarization voltage computing device provided in an embodiment of the present invention；
Fig. 5 is the differentiation schematic diagram of a kind of fault phase provided in an embodiment of the present invention and non-three phase；
Fig. 6 is the differentiation schematic diagram of another kind fault phase provided in an embodiment of the present invention and non-three phase；
Fig. 7 is the differentiation schematic diagram of the third fault phase provided in an embodiment of the present invention and non-three phase；
In Fig. 5-7, symbol is expressed as：
U0- residual voltage, I0- zero-sequence current, Un- rated voltage, In- rated current, Ua-A phase voltage, Ub-B phase is electric
Pressure, Uc-C phase voltage, Ia-A phase current, Ib-B phase current, Ic-C phase current, k1- residual voltage sets threshold coefficient, k2- the
One false voltage sets threshold coefficient, and k3- zero-sequence current sets threshold coefficient, and k4- second false voltage sets threshold coefficient,
K5- Fisrt fault current settings threshold coefficient, k6- second fault current sets threshold coefficient.
Specific embodiment
Here will in detail exemplary embodiment be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the present invention.On the contrary, they be only with such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, the present invention.
Referring to Fig. 1, it is the structural representation of Y/ △ transformator single ended power supply system provided in an embodiment of the present invention.Y/ △ becomes
In depressor single ended power supply system, Y side is mains side, and △ side is load side, when Y/ △ transformator is in single-phase non-full-operating state
When, in the event of other phase singlephase earth faults, when mains side breaks down, if now system is in open-phase operation shape
State, then positive sequence voltage phase place act in an unreasonable way before and after fault skew, be not suitable for use in the positive sequence polarization voltage of distance protection.
Referring to Fig. 2, it is a kind of flow process signal of the positive sequence polarization voltage computational methods according to an exemplary embodiment
Figure, specifically includes following steps：
S110：By detecting zero-sequence current component, the zero sequence voltage component of Y/ △ transformator single ended power supply system power supply side
With three-phase voltage amplitude, judge whether Y/ △ transformator single ended power supply system power supply side occurs single-phase non-three phase fault again.
Because the △ side of Y/ △ transformator single ended power supply system is triangular structure, three-phase voltage vector sum is always 0,
There is non-three phase and when fault mutually other occurs again in mains side, non-three phase voltage magnitude with to perfect phase voltage amplitude almost equal,
But phase differential is larger, therefore in order to ensure the positive sequence voltage phase place before and after positive sequence polarization voltage failure is consistent, the present invention is led to
Cross judgement mains side and single-phase non-three phase fault again occurs, thus choose perfecting phase voltage as positive sequence polarization voltage, effectively solving
Due to the positive sequence electricity before and after leading to positive sequence polarization voltage failure using three-phase voltage phase place when existing positive sequence polarization voltage calculates
The inconsistent problem of pressure phase place.Referring to Fig. 3, it is a kind of stream judging single-phase non-three phase fault method provided in an embodiment of the present invention
Journey schematic diagram, there is the concrete judge process bag of single-phase non-three phase fault again in the mains side of Y/ △ transformator single ended power supply system
Include：
S1101：When the mains side of Y/ △ transformator single ended power supply system breaks down, judge the single-ended electricity of Y/ △ transformator
The mains side of origin system whether there is zero-sequence current component.
Specifically, when the mains side of Y/ △ transformator single ended power supply system occurs asymmetric earth fault, mains side is deposited
In zero-sequence current component；When mains side occurs phase to phase fault or three-phase fault, there is not zero-sequence current component in mains side.Cause
This, by detect mains side whether there is zero-sequence current component it can be determined that mains side occur fault type.
S1102：If the mains side of Y/ △ transformator single ended power supply system has zero-sequence current component, judge that Y/ △ becomes
Whether the mains side of depressor single ended power supply system does not have zero sequence voltage component.
Specifically, zero-sequence current component is had according to the mains side of Y/ △ transformator single ended power supply system, judge mains side
There is asymmetric earth fault.
Further, if the operating condition of Y/ △ transformator single ended power supply system is entirely mutually to run, when mains side occurs
During asymmetric earth fault, then there is zero sequence voltage component in mains side；If the operation work of Y/ △ transformator single ended power supply system
Condition is open-phase operation, and when mains side occurs asymmetric earth fault, mains side does not then have zero sequence voltage component.Therefore,
When mains side has zero-sequence current component, whether there is zero sequence voltage component it can be determined that Y/ △ becomes by detecting mains side
Whether the operating condition of depressor single ended power supply system is open-phase operation.
S1103：If the mains side of Y/ △ transformator single ended power supply system does not have zero sequence voltage component, judge Y/ △
In the mains side three-phase voltage of transformator single ended power supply system whether there is two-phase voltage amplitude be more than voltage set threshold value,
The amplitude of another phase voltage is less than described voltage and sets threshold value.
Specifically, zero sequence voltage component is not had according to the mains side of Y/ △ transformator single ended power supply system, judge Y/ △
The operating condition of transformator single ended power supply system is open-phase operation.
Further, when the mains side of Y/ △ transformator single ended power supply system occurs single-phase non-three phase fault again, due to
Y/ △ transformator △ side is triangular structure, and determining mains side three-phase voltage vector sum under this state is 0.Therefore, by inspection
Survey the amplitude with the presence or absence of two-phase voltage in mains side three-phase voltage low more than the amplitude of voltage setting threshold value, another phase voltage
Set threshold value in voltage it can be determined that whether mains side occurs single-phase non-three phase fault again.
In the present embodiment, voltage sets threshold value as the 80% of three-phase voltage rated voltage, and certainly, voltage sets threshold value
All can should belong to the present invention's according to the concrete setting such as the electric pressure of Y/ △ transformator single ended power supply system, application scenarios
Protection domain.
S1104：If there is the amplitude of two-phase voltage in the mains side three-phase voltage of Y/ △ transformator single ended power supply system
Set threshold value more than voltage, the amplitude of another phase voltage is less than voltage and sets threshold value, then Y/ △ transformator single ended power supply system
There is single-phase non-three phase fault again in the mains side of system.
Specifically, the three-phase voltage amplitude of the Y/ detecting △ transformator single ended power supply system is set door with voltage respectively
Threshold value is made comparisons, and the amplitude if there is two-phase voltage is more than the amplitude of voltage setting threshold value, another phase voltage less than voltage
Set threshold value, and, mains side obtained according to step S1102 there is zero-sequence current component, step S1103 obtains mains side not
There is zero sequence voltage component, therefore, judge that the mains side of Y/ △ transformator single ended power supply system occurs single-phase non-three phase fault again.
S120：If the mains side of Y/ △ transformator single ended power supply system occurs single-phase non-three phase fault again, judge the
Whether the amplitude of one phase current is more than current settings threshold value, and wherein, the first phase current is Y/ △ transformator single ended power supply system
Mains side three-phase voltage in, voltage magnitude be more than voltage set threshold value the corresponding phase current of phase voltage.
Specifically, single-phase non-three phase is occurred according to the mains side that step S1104 judges Y/ △ transformator single ended power supply system
Fault again, then be not suitable for use in the positive sequence polarization voltage-phase of distance protection based on the positive sequence voltage phase place that three-phase voltage calculates,
And perfect phase voltage phase place and keep constant before and after fault, therefore perfect the positive sequence pole that phase voltage phase place is suitable as distance protection
Change voltage-phase.
Voltage magnitude according to perfecting phase is higher than to set threshold value, current amplitude to cause because of load current and trouble point
Zero-sequence current and be higher than set threshold value feature, obtain voltage magnitude in three-phase voltage using step S1104 and set more than voltage
The biphase current of set threshold value, by detecting corresponding two group of first phase current of biphase current, judges in two group of first phase current
Amplitude with the presence or absence of one of which first phase current is more than current settings threshold value.
In the present embodiment, current settings threshold value is according to the electric pressure of Y/ △ transformator single ended power supply system, applied field
Scape etc. is concrete to be arranged, and the present invention is no longer specifically limited.
S130：If the amplitude of the first phase current is more than current settings threshold value, by corresponding for the first phase current mutually electricity
Pressure is as positive sequence polarization voltage.
Specifically, judge to obtain, according to step S120, the width that there is one of which first phase current in two group of first phase current
Value is more than current settings threshold value, and, obtains the corresponding phase voltage of two group of first phase current according to step S1104 and be all higher than electricity
Pressure sets threshold value, and therefore, what the amplitude of the first phase current was more than current settings threshold value is mutually to perfect phase, will perfect phase voltage
As positive sequence polarization voltage.Keep constant before and after fault due to perfecting phase voltage phase place, therefore, phase voltage will be perfected as just
Sequence polarizing voltage, impedance relay will not occur malfunction, in troubles inside the sample space, tripping occur in external area error, reach relay and protect
The purpose of shield.
Further, if the amplitude of the first phase current is less than current settings threshold value, the corresponding phase of the first phase current
Voltage is non-three phase.Judge whether the amplitude of the second phase current is more than current settings threshold value, wherein, the second phase current is Y/ △
In the three-phase voltage of transformator single ended power supply system, voltage magnitude is less than the corresponding mutually electricity of phase voltage that voltage sets threshold value
Stream；If the amplitude of the second phase current is more than current settings threshold value, the corresponding phase voltage of the second phase current is fault phase.Root
According to the differentiation result of non-three phase in three-phase voltage and fault phase, system running state, fault type and fault characteristic can be done into
One step analysis.
In conjunction with above-mentioned positive sequence polarization voltage computational methods, the embodiment of the present invention additionally provides a kind of positive sequence polarization voltage and calculates
Device, referring to Fig. 4, is a kind of positive sequence polarization electricity being applied to Y/ △ transformator single ended power supply system provided in an embodiment of the present invention
Pressure computing device, this positive sequence polarization voltage computing device includes：
Single-phase non-three phase breakdown judge module again:For detecting the zero sequence electricity of Y/ △ transformator single ended power supply system power supply side
Flow component, zero sequence voltage component and three-phase voltage amplitude, judge whether Y/ △ transformator single ended power supply system power supply side occurs list
Phase non-three phase fault again.
Specifically, in Y/ △ transformator single ended power supply system power supply side, the residual voltage of detection A, B, C three-phase voltage divides
The amplitude of amount, zero-sequence current component and A, B, C three-phase voltage, if there is zero-sequence current component, there is not residual voltage in system
There is two-phase voltage amplitude little more than voltage setting amplitude, another phase voltage amplitude in the amplitude of component and A, B, C three-phase voltage
Set amplitude in voltage, then judge that system is in single-phase non-full-operating state, and there occurs in system power supply side single-phase non-complete
Phase fault again.
Perfect phase judge module：For there is single-phase non-three phase fault again when Y/ △ transformator single ended power supply system power supply side
When, then judge whether the amplitude of the first phase current is more than current settings threshold value, wherein, the first phase current is Y/ △ transformator list
Hold in power-supply system mains side three-phase voltage, voltage magnitude is more than the corresponding phase current of phase voltage that voltage sets threshold value.
Specifically, when by single-phase non-three phase, breakdown judge module judges Y/ △ transformator single ended power supply system power supply side again
Occur single-phase non-three phase again fault when, detect the corresponding phase current of A, B, C three-phase voltage, wherein, by three-phase voltage, voltage amplitude
The corresponding phase current of phase voltage that value is more than voltage setting threshold value is defined as the first phase current, judges the amplitude of the first phase current
Whether it is more than current settings threshold value, if the amplitude of the first phase current is more than current settings threshold value, judge that this is strong
Quan Xiang.
Positive sequence polarization voltage output module：For when the amplitude of the first phase current is more than current settings threshold value, then
The corresponding phase voltage of first phase current is output as positive sequence polarization voltage.
Specifically, obtain perfecting phase by perfecting phase judge module, that is, the amplitude of the first phase current is more than current settings door
The corresponding phase voltage of threshold value, using this phase voltage as positive sequence polarization voltage, using this phase phase place as positive sequence polarization voltage-phase.
In still another embodiment of the process, described device also includes：
Non-three phase judge module：For when the amplitude of the first phase current is less than current settings threshold value, then by the first phase
The corresponding phase voltage of electric current is judged as non-three phase.
Fault phase judge module：Whether the amplitude for judging the second phase current is more than current settings threshold value, wherein, the
Two-phase current is in the three-phase voltage of Y/ △ transformator single ended power supply system, and voltage magnitude is less than the mutually electricity that voltage sets threshold value
Press corresponding phase current；
If the amplitude of the second phase current is more than current settings threshold value, the corresponding phase voltage of the second phase current is judged as
Fault phase.
Fig. 5 is the differentiation schematic diagram of a kind of fault phase according to the present invention one exemplary embodiment and non-three phase.Root
According to the definition of residual voltage and zero-sequence current, as U0 ＜ k1 × Un+I0 × Z0, then there is not residual voltage in decision-making system；When
During 3I0 ＞ k3 × In, then there is zero-sequence current in decision-making system.As Ub ＞ k2 × Un, that is, B phase voltage amplitude sets more than first voltage
Set threshold value, then judge B phase as non-faulting phase；As Uc ＞ k2 × Un, that is, C phase voltage amplitude is more than first voltage setting threshold
Value, then judge C phase as non-faulting phase；As Ua ＜ k4 × Un, that is, A phase voltage amplitude is less than second voltage setting threshold value, then A phase
It may be fault phase.There is zero-sequence current, there is not residual voltage, there is two-phase voltage in three-phase voltage according to system power supply side
Amplitude is more than voltage setting threshold value and another phase voltage amplitude is single-phase non-complete less than voltage setting threshold value decision-making system generation
Phase fault again.
Further, when A phase voltage amplitude is less than second voltage and sets threshold value, if Ia ＞ is k6 × In, that is, A phase is electric
Stream sets threshold value more than the second fault current, then judges A phase as fault phase, i.e. the event of system generation single-phase non-three phase fault again
Barrier is mutually A phase；When B phase voltage amplitude is more than first voltage and sets threshold value, if Ib ＜ is k5 × In, that is, B phase current is less than
Fisrt fault current settings threshold value, then judge B phase as non-three phase；Set threshold value when C phase voltage amplitude is more than first voltage
When, if Ic ＜ is k5 × In, that is, C phase current is less than Fisrt fault current settings threshold value, then judge C phase as non-three phase.
When A phase be fault phase, B phase be non-three phase when, then C phase be perfect phase, using C phase voltage as positive sequence polarization voltage,
Using C phase voltage phase place as positive sequence polarization voltage-phase；When A phase be fault phase, C phase be non-three phase when, then B phase be perfect phase,
Using B phase voltage as positive sequence polarization voltage, using B phase voltage phase place as positive sequence polarization voltage-phase.
When Fig. 6, Fig. 7 respectively B phase is fault phase, C phase is fault phase, there is single-phase non-three phase fault, fault phase in system
With the differentiation schematic diagram of non-three phase, it differentiates that content is similar to the above embodiments, will not be described here.
As seen from the above-described embodiment, the computational methods of the positive sequence polarization voltage that the present invention provides, by detecting Y/ △ transformation
The zero-sequence current component of device single ended power supply system power supply side, zero sequence voltage component and three-phase voltage, judge whether system occurs list
Phase non-three phase fault again, when system occurs single-phase non-three phase fault again, by detecting A, B, C three-phase voltage and A, B, C three-phase
Electric current, judges to perfect phase, fault phase and non-three phase, and chooses and perfect phase voltage as positive sequence polarization voltage, chooses sound mutually electricity
Pressure phase place, as positive sequence polarization voltage-phase, keeps not, therefore perfecting due to perfecting phase voltage phase place before fault, after fault
Phase voltage effectively prevent positive sequence polarization voltage-phase as positive sequence polarization voltage and offsets the distance protection equipment causing outside area
It may happen that it may happen that the situation of tripping when malfunction, troubles inside the sample space, improve distance protection equipment protection act and open during fault
The accuracy opening.
Those skilled in the art are considering description and practice here after disclosure of the invention, will readily occur to its of the present invention
Its embodiment.The application is intended to any modification, purposes or the adaptations of the present invention, these modifications, purposes or
Person's adaptations are followed the general principle of the present invention and are included the undocumented common knowledge in the art of the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It is described above and precision architecture illustrated in the accompanying drawings it should be appreciated that the invention is not limited in, and
And various modifications and changes can carried out without departing from the scope.The scope of the present invention only to be limited by appended claim.
Claims (8)
1. a kind of computational methods of positive sequence polarization voltage are it is characterised in that include：
By detecting zero-sequence current component, zero sequence voltage component and the three-phase voltage of Y/ △ transformator single ended power supply system power supply side
Amplitude, judges whether described Y/ △ transformator single ended power supply system power supply side occurs single-phase non-three phase fault again；
When described Y/ △ transformator single ended power supply system power supply side occurs single-phase non-three phase fault again, then judge the first phase current
Amplitude whether be more than current settings threshold value, wherein, described first phase current is described Y/ △ transformator single ended power supply system
In mains side three-phase voltage, voltage magnitude be more than voltage set threshold value the corresponding phase current of phase voltage；
If the amplitude of described first phase current is more than current settings threshold value, by corresponding for described first phase current phase voltage
As positive sequence polarization voltage.
2. the computational methods of positive sequence polarization voltage according to claim 1 are it is characterised in that become by described detection Y/ △
The zero-sequence current component of depressor single ended power supply system power supply side and zero sequence voltage component, judge described Y/ △ transformator single ended power supply
Whether system power supply side occurs single-phase non-three phase, and fault includes again：
When breaking down in Y/ △ transformator single ended power supply system power supply side, then judge described Y/ △ transformator single ended power supply system
Mains side whether there is zero-sequence current component；
If described Y/ △ transformator single ended power supply system power supply side has described zero-sequence current component, judge that described Y/ △ becomes
Whether depressor single ended power supply system power supply side does not have zero sequence voltage component；
If described Y/ △ transformator single ended power supply system power supply side does not have described zero sequence voltage component, judge described Y/ △
In the three-phase voltage of transformator single ended power supply system power supply side, if exist two-phase voltage amplitude be more than voltage set threshold value,
The amplitude of another phase voltage is less than described voltage and sets threshold value；
If in the mains side three-phase voltage of described Y/ △ transformator single ended power supply system, the amplitude that there is two-phase voltage is more than institute
State voltage and set the amplitude of threshold value, another phase voltage less than described voltage setting threshold value, then described Y/ △ transformator is single-ended
There is single-phase non-three phase fault again in the mains side of power-supply system.
3. the computational methods of positive sequence polarization voltage according to claim 1 are it is characterised in that methods described also includes：
If the amplitude of described first phase current is less than current settings threshold value, described first phase current is corresponding described mutually electric
Press as non-three phase.
4. the computational methods of positive sequence polarization voltage according to claim 1 are it is characterised in that methods described also includes：
Judge whether the amplitude of the second phase current is more than current settings threshold value, wherein, described second phase current is described Y/ △
In the three-phase voltage of transformator single ended power supply system, voltage magnitude is less than the corresponding phase of phase voltage that described voltage sets threshold value
Electric current；
If the amplitude of described second phase current is more than current settings threshold value, described second phase current is corresponding described mutually electric
Press as fault phase.
5. the computational methods of positive sequence polarization voltage according to claim 1 are it is characterised in that described voltage sets threshold value
For three-phase voltage rated voltage 80%.
6. a kind of positive sequence polarization voltage computing device is it is characterised in that include:
Single-phase non-three phase breakdown judge module again：Zero-sequence current for detecting Y/ △ transformator single ended power supply system power supply side divides
Amount, zero sequence voltage component and three-phase voltage amplitude, judge whether described Y/ △ transformator single ended power supply system power supply side occurs list
Phase non-three phase fault again；
Perfect phase judge module：For there is single-phase non-three phase fault again when described Y/ △ transformator single ended power supply system power supply side
When, then judge whether the amplitude of the first phase current is more than current settings threshold value, wherein, described first phase current is described Y/ △
In the three-phase voltage of transformator single ended power supply system power supply side, voltage magnitude be more than voltage set threshold value the corresponding phase of phase voltage
Electric current；
Positive sequence polarization voltage output module：For when the amplitude of described first phase current is more than current settings threshold value, then
The corresponding phase voltage of described first phase current is output as positive sequence polarization voltage.
7. positive sequence polarization voltage computing device according to claim 6 is it is characterised in that described device also includes：
Non-three phase judge module：For when the amplitude of described first phase current is less than current settings threshold value, then by described the
The corresponding described phase voltage of one phase current is judged as non-three phase.
8. positive sequence polarization voltage computing device according to claim 6 is it is characterised in that described device also includes：
Fault phase judge module：Whether amplitude for judging the second phase current is more than current settings threshold value, wherein, described the
Two-phase current is in the three-phase voltage of described Y/ △ transformator single ended power supply system, and voltage magnitude is less than described voltage and sets threshold
The corresponding phase current of phase voltage of value；
If the amplitude of described second phase current is more than current settings threshold value, described second phase current is corresponding described mutually electric
Pressure is judged as fault phase.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109444565A (en) * | 2018-05-24 | 2019-03-08 | 天津大学 | A kind of single-phase permanent fault recognition methods based on voltage-phase fluctuation characteristic |
| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
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| CN1658463A (en) * | 2004-02-19 | 2005-08-24 | 烟台东方电子信息产业股份有限公司 | Discriminiting element for developmental fault of high-voltage transmission line of power system |
| CN103760458A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Single-phase grounding fault direction discriminating method of double-circuit lines on the same tower |
| CN104076248A (en) * | 2014-07-09 | 2014-10-01 | 山东大学 | Fault direction judgment method based on positive-sequence polarization voltage phase comparison |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1658463A (en) * | 2004-02-19 | 2005-08-24 | 烟台东方电子信息产业股份有限公司 | Discriminiting element for developmental fault of high-voltage transmission line of power system |
| CN103760458A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Single-phase grounding fault direction discriminating method of double-circuit lines on the same tower |
| CN104076248A (en) * | 2014-07-09 | 2014-10-01 | 山东大学 | Fault direction judgment method based on positive-sequence polarization voltage phase comparison |
Cited By (3)
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| CN109444565A (en) * | 2018-05-24 | 2019-03-08 | 天津大学 | A kind of single-phase permanent fault recognition methods based on voltage-phase fluctuation characteristic |
| CN109444565B (en) * | 2018-05-24 | 2020-03-17 | 天津大学 | Single-phase permanent fault identification method based on voltage phase fluctuation characteristics |
| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
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