CN106410764B - A kind of calculation method and device of positive sequence polarization voltage - Google Patents
A kind of calculation method and device of positive sequence polarization voltage Download PDFInfo
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- CN106410764B CN106410764B CN201610918143.XA CN201610918143A CN106410764B CN 106410764 B CN106410764 B CN 106410764B CN 201610918143 A CN201610918143 A CN 201610918143A CN 106410764 B CN106410764 B CN 106410764B
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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 present invention relates to the calculation methods and device of a kind of positive sequence polarization voltage, including zero-sequence current component, zero sequence voltage component and the three-phase voltage amplitude by detection Y/ △ transformer single ended power supply system power supply side, judge whether Y/ △ transformer single ended power supply system power supply side occurs single-phase non-three phase failure again；When single-phase non-three phase failure again occurs for the △ transformer single ended power supply system power supply side Y/, then judge whether the amplitude of the first phase current is greater than electric current setting threshold value, wherein, the first phase current be Y/ △ transformer single ended power supply system power supply side three-phase voltage in, voltage magnitude be greater than voltage set threshold value the corresponding phase current of phase voltage；If the amplitude of the first phase current, which is greater than electric current, sets threshold value, the corresponding phase voltage of the first phase current is as positive sequence polarization voltage.The positive sequence polarization voltage-phase of the calculation method of positive sequence polarization voltage provided by the invention, acquisition remains unchanged before and after failure generation, improves the validity of distance protection equipment protection act unlatching.
Description
Technical field
The present invention relates to technical field of relay protection more particularly to a kind of calculation methods and device of positive sequence polarization voltage.
Background technique
Distance protection is a kind of protective relaying device, the device be able to reflect fault point in transmission line of electricity with apart from guarantor
The distance between installation place is protected, and can determine the actuation time for opening protection according to the distance of distance.The core of distance protection
Element is impedance relay, and impedance relay is for measuring short-circuit impedance, when short-circuit impedance is less than adjusting impedance, impedance relay
Device opens protection.Impedance relay includes Amplitude Comparison impedance relay and phase comparison expression impedance relay, wherein phase
The operation condition of comparison expression impedance relay is 90 °≤Arg (U1/U2)≤270 °, wherein U2 is offset voltage, is that reflection is short
The anti-operating voltage with adjusting impedance comparison result of roadlock, U1 are polarizing voltage, are the reference voltages for judging U2 phase change.
In general electric system, positive sequence voltage due to having the characteristic remained unchanged before failure with phase after failure, because
This is commonly used for the reference voltage for judging U2 phase change, i.e., using positive sequence voltage as polarizing voltage.Distance protection is according to U2 phase
Variation determines whether to open protection, wherein when breaking down in the protection zone positive direction of distance protection, protects if failure is located at
It protects and is then known as troubles inside the sample space in area, impedance relay should act immediately at this time；Occur when on the protection zone opposite direction of distance protection
When failure, then failure is directly judged to external area error, impedance relay should not act at this time.Positive sequence voltage phase 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 electric system is Y/ △ (side Y is source side, the side △ is load side) transformer single ended power supply system and electricity
When net system is in non-full-operating state, if failure again, source side non-three phase voltage magnitude occur for the other phases of source side
Phase voltage amplitude is almost equal with perfecting, but phase differential is larger, so that being formed based on source side three-phase voltage phase calculation
Positive sequence voltage phase shift so that positive sequence voltage phase before failure with, there are biggish phase difference, cause after failure
Malfunction may occur in external area error for distance protection, and tripping may occur in troubles inside the sample space, and positive sequence voltage is no longer at this time
It is suitable as polarizing voltage.
Summary of the invention
To overcome the problems in correlation technique, the present invention provides the calculation method and dress of a kind of positive sequence polarization voltage
It sets.
According to a first aspect of the embodiments of the present invention, a kind of calculation method of positive sequence polarization voltage is provided, comprising:
By the zero-sequence current component, zero sequence voltage component and the three-phase that detect Y/ △ transformer single ended power supply system power supply side
Voltage magnitude, judges whether the Y/ △ transformer single ended power supply system power supply side occurs single-phase non-three phase failure again；
When single-phase non-three phase failure again occurs for Y/ △ transformer single ended power supply system power supply side, then the first phase is judged
Whether the amplitude of electric current is greater than electric current setting threshold value, wherein first phase current is the Y/ △ transformer single ended power supply
In the three-phase voltage of system power supply side, voltage magnitude be greater than voltage setting threshold value the corresponding phase current of phase voltage；
If the amplitude of first phase current, which is greater than electric current, sets threshold value, by the corresponding phase of first phase current
Voltage is as positive sequence polarization voltage.
Preferably, electric by the zero-sequence current component and zero sequence that detect the Y/ △ transformer single ended power supply system power supply side
Component is pressed, judges single-phase non-three phase whether to occur in the Y/ △ transformer single ended power supply system power supply side that failure includes: again
When Y/ △ transformer single ended power supply system power supply side is broken down, then the Y/ △ transformer single ended power supply is judged
System power supply side whether there is zero-sequence current component；
If there are the zero-sequence current components for Y/ △ transformer single ended power supply system power supply side, the Y/ is judged
Whether △ transformer single ended power supply system power supply side is not present zero sequence voltage component；
If Y/ △ transformer single ended power supply system power supply side be not present the zero sequence voltage component, judgement described in
In the three-phase voltage of Y/ △ transformer single ended power supply system power supply side, if be greater than voltage there are the amplitude of two-phase voltage and set threshold
Value, the amplitude of another phase voltage set threshold value lower than the voltage；
If there are the amplitude of two-phase voltage is big in the source side three-phase voltage of the Y/ △ transformer single ended power supply system
Threshold value is set lower than the voltage in the amplitude of voltage setting threshold value, another phase voltage, then the Y/ △ transformer
Single-phase non-three phase failure again occurs for the source side of single ended power supply system.
Preferably, the method also includes:
If the amplitude of first phase current, which is less than electric current, sets threshold value, first phase current is corresponding described
Phase voltage is non-three phase.
Preferably, the method also includes:
Judge whether the amplitude of the second phase current is greater than electric current setting threshold value, wherein second phase current is described
In the three-phase voltage of Y/ △ transformer single ended power supply system, the phase voltage that voltage magnitude is less than voltage setting threshold value is corresponding
Phase current；
If the amplitude of second phase current, which is greater than electric current, sets threshold value, second phase current is corresponding described
Phase voltage is failure phase.
Preferably, the voltage sets threshold value as the 80% of three-phase voltage voltage rating.
According to a second aspect of the embodiments of the present invention, a kind of computing device of positive sequence polarization voltage, described device are also provided
Include:
Single-phase non-three phase breakdown judge module again: for detecting the zero sequence electricity of Y/ △ transformer single ended power supply system power supply side
Flow component, zero sequence voltage component and three-phase voltage amplitude, judge whether the Y/ △ transformer single ended power supply system power supply side is sent out
Give birth to single-phase non-three phase failure again；
Perfect phase judgment module: for when single-phase non-three phase occurs for Y/ △ transformer single ended power supply system power supply side again
When failure, then judge whether the amplitude of the first phase current is greater than electric current setting threshold value, wherein first phase current is described
In the three-phase voltage of Y/ △ transformer single ended power supply system power supply side, voltage magnitude be greater than voltage setting threshold value phase voltage it is corresponding
Phase current；
Positive sequence polarization voltage output module: for when the amplitude of first phase current be greater than electric current setting threshold value when,
Then the corresponding phase voltage of first phase current is exported as positive sequence polarizing voltage.
Preferably, described device further include:
Non-three phase judgment module: for when the amplitude of first phase current be less than electric current setting threshold value when, then by institute
It states the corresponding phase voltage of the first phase current and is judged as non-three phase.
Preferably, described device further include:
Failure phase judgment module: for judging whether the amplitude of the second phase current is greater than electric current setting threshold value, wherein institute
It states in the three-phase voltage that the second phase current is the Y/ △ transformer single ended power supply system, voltage magnitude is set less than the voltage
The corresponding phase current of the phase voltage of threshold value；
If the amplitude of second phase current, which is greater than electric current, sets threshold value, second phase current is corresponding described
Phase voltage is judged as failure phase.
The embodiment of the present invention provide technical solution can include the following benefits: it is provided in an embodiment of the present invention just
The calculation method of sequence polarizing voltage, by the zero-sequence current component, the zero sequence that detect Y/ △ transformer single ended power supply system power supply side
Component of voltage and three-phase voltage, when judging that Y/ △ transformer single ended power supply system power supply side is broken down, fault type whether be
Single-phase non-three phase failure again；When fault type is single-phase non-three phase failure again, by judging that the amplitude of the first phase current is greater than
Electric current sets threshold value, wherein the first phase current is in the three-phase voltage of Y/ △ transformer single ended power supply system, and voltage magnitude is big
In the corresponding phase current of phase voltage of voltage setting threshold value, obtaining the corresponding phase voltage of the first phase current is to perfect phase；It will 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/ △ transformer single ended power supply system
Operating condition, Y/ △ transformer single ended power supply system source side occur non-three phase again failure when, pass through detection three-phase voltage voltage
Amplitude and with voltage setting amplitude compared with, detection three-phase voltage current amplitude and with electric current setting amplitude compared with choose it is strong
Quan Xiang will perfect phase voltage as positive sequence polarization electricity using characteristic of the phase voltage before failure with phase invariant after failure is perfected
Pressure, efficiently solve Y/ △ transformer single ended power supply system occur non-three phase again failure when, external area error malfunction and troubles inside the sample space
The problem of tripping.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without any creative labor, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of Y/ △ transformer single ended power supply system provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram of positive sequence polarization voltage calculation method provided in an embodiment of the present invention；
Fig. 3 is a kind of flow diagram for judging single-phase non-three phase fault method provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of positive sequence polarization voltage computing device provided in an embodiment of the present invention；
Fig. 5 is a kind of differentiation schematic diagram of failure phase and non-three phase provided in an embodiment of the present invention；
Fig. 6 is the differentiation schematic diagram of another failure phase and non-three phase provided in an embodiment of the present invention；
Fig. 7 is the differentiation schematic diagram of the third failure phase and non-three phase provided in an embodiment of the present invention；
In Fig. 5-7, symbol is expressed as:
U0- residual voltage, I0- zero-sequence current, Un- voltage rating, In- rated current, Ua-A phase voltage, Ub-B phase electricity
Pressure, Uc-C phase voltage, Ia-A phase current, Ib-B phase current, Ic-C phase current, k1- residual voltage set threshold coefficient, k2- the
One false voltage sets threshold coefficient, and k3- zero-sequence current sets threshold coefficient, and the second false voltage of k4- sets threshold coefficient,
K5- Fisrt fault electric current sets threshold coefficient, and the second fault current of k6- sets threshold coefficient.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
It is the structural schematic diagram of Y/ △ transformer single ended power supply system provided in an embodiment of the present invention referring to Fig. 1.Y/ △ becomes
The side Y is source side in depressor single ended power supply system, and the side △ is load side, when Y/ △ transformer is in single-phase non-full-operating state
When, in case of other phase singlephase earth faults, when source side breaks down, if system is in open-phase operation shape at this time
State, then positive sequence voltage phase is acted in an unreasonable way offset before and after failure, is not suitable for use in the positive sequence polarization voltage of distance protection.
It referring to fig. 2, is a kind of process signal of positive sequence polarization voltage calculation method shown according to an exemplary embodiment
Figure, specifically comprises the following steps:
S110: zero-sequence current component, zero sequence voltage component by detecting Y/ △ transformer single ended power supply system power supply side
With three-phase voltage amplitude, judge whether Y/ △ transformer single ended power supply system power supply side occurs single-phase non-three phase failure again.
Since the side △ of Y/ △ transformer single ended power supply system is triangular structure, three-phase voltage vector sum is always 0,
Source side is there are non-three phase and when failure again occurs for other phases, 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 before and after positive sequence polarization voltage failure is consistent, the present invention is logical
It crosses judgement source side and single-phase non-three phase failure again occurs, perfect phase voltage as positive sequence polarization voltage to choose, effectively solve
Due to leading to using three-phase voltage phase the positive sequence electricity before and after positive sequence polarization voltage failure when existing positive sequence polarization voltage calculates
The problem for pressing phase inconsistent.It is a kind of stream for judging single-phase non-three phase fault method provided in an embodiment of the present invention referring to Fig. 3
The specific deterministic process packet of single-phase non-three phase failure again occurs for journey schematic diagram, the source side of Y/ △ transformer single ended power supply system
It includes:
S1101: when the source side of Y/ △ transformer single ended power supply system breaks down, judge the single-ended electricity of Y/ △ transformer
The source side of source system whether there is zero-sequence current component.
Specifically, source side is deposited when asymmetric ground fault occurs for the source side of Y/ △ transformer single ended power supply system
In zero-sequence current component；When phase to phase fault or three-phase fault occur for source side, zero-sequence current component is not present in source side.Cause
This, whether there is zero-sequence current component by detection source side, it can be determined that the fault type that source side occurs.
S1102: if the source side of Y/ △ transformer single ended power supply system there are zero-sequence current component, judges that Y/ △ becomes
Whether the source side of depressor single ended power supply system is not present zero sequence voltage component.
Specifically, according to the source side of Y/ △ transformer single ended power supply system, there are zero-sequence current components, judge source side
Asymmetric ground fault occurs.
Further, if the operating condition of Y/ △ transformer single ended power supply system is complete mutually operation, when source side occurs
When asymmetric ground fault, then there is zero sequence voltage component in source side；If the operation work of Y/ △ transformer single ended power supply system
Condition is open-phase operation, and when asymmetric ground fault occurs for source side, zero sequence voltage component is then not present in source side.Therefore,
When source side is there are when zero-sequence current component, zero sequence voltage component whether there is by detection source side, it can be determined that Y/ △ becomes
Whether the operating condition of depressor single ended power supply system is open-phase operation.
S1103: if zero sequence voltage component is not present in the source side of Y/ △ transformer single ended power supply system, judge Y/ △
In the source side three-phase voltage of transformer single ended power supply system with the presence or absence of two-phase voltage amplitude be greater than voltage setting threshold value,
The amplitude of another phase voltage sets threshold value lower than the voltage.
Specifically, zero sequence voltage component is not present according to the source side of Y/ △ transformer single ended power supply system, Y/ △ is judged
The operating condition of transformer single ended power supply system is open-phase operation.
Further, when single-phase non-three phase failure again occurs for the source side of Y/ △ transformer single ended power supply system, due to
The side transformer △ Y/ △ is triangular structure, determines that source side three-phase voltage vector sum is 0 under the state.Therefore, pass through inspection
It surveys low greater than voltage setting threshold value, the amplitude of another phase voltage with the presence or absence of the amplitude of two-phase voltage in source side three-phase voltage
Threshold value is set in voltage, it can be determined that whether source side occurs single-phase non-three phase failure again.
In the present embodiment, voltage sets threshold value as the 80% of three-phase voltage voltage rating, certainly, voltage setting threshold value
It can be specifically arranged according to voltage class, application scenarios of Y/ △ transformer single ended power supply system etc., all be should belong to of the invention
Protection scope.
S1104: if there are the amplitudes of two-phase voltage in the source side three-phase voltage of Y/ △ transformer single ended power supply system
Amplitude greater than voltage setting threshold value, another phase voltage sets threshold value lower than voltage, then Y/ △ transformer single ended power supply system
Single-phase non-three phase failure again occurs for the source side of system.
Specifically, the three-phase voltage amplitude for the Y/ △ transformer single ended power supply system that will test sets door with voltage respectively
Threshold value is made comparisons, and is lower than voltage greater than the amplitude of voltage setting threshold value, another phase voltage if there is the amplitude of two-phase voltage
Threshold value is set, also, source side is obtained according to step S1102 there are zero-sequence current component, step S1103 to obtain source side not
There are zero sequence voltage components, therefore, judge that single-phase non-three phase failure again occurs for the source side of Y/ △ transformer single ended power supply system.
S120: if single-phase non-three phase failure again occurs for the source side of Y/ △ transformer single ended power supply system, judge the
Whether the amplitude of one phase current is greater than electric current setting threshold value, wherein the first phase current is Y/ △ transformer single ended power supply system
Source side three-phase voltage in, voltage magnitude be greater than voltage setting threshold value the corresponding phase current of phase voltage.
Specifically, judging that single-phase non-three phase occurs for the source side of Y/ △ transformer single ended power supply system according to step S1104
Failure again, then the positive sequence voltage phase calculated based on three-phase voltage are not suitable for use in the positive sequence polarization voltage-phase of distance protection,
And perfects phase voltage phase and remained unchanged before and after failure, therefore perfect the positive sequence pole that phase voltage phase is suitable as distance protection
Change voltage-phase.
Caused by being higher than setting threshold value, current amplitude because of load current and fault point according to the voltage magnitude for perfecting phase
Zero-sequence current and the characteristics of be higher than setting threshold value, obtain in three-phase voltage voltage magnitude using step S1104 and set greater than voltage
The biphase current of set threshold value is judged in two group of first phase current by corresponding two group of first phase current of detection biphase current
It is greater than electric current setting threshold value with the presence or absence of the amplitude of wherein one group of first phase current.
In the present embodiment, electric current sets threshold value according to voltage class, the applied field of Y/ △ transformer single ended power supply system
Scape etc. is specifically arranged, and the present invention is no longer specifically limited.
S130: if the amplitude of the first phase current is greater than electric current and sets threshold value, by the corresponding phase electricity of the first phase current
Pressure is used as positive sequence polarization voltage.
Specifically, judging to obtain the width that there is wherein one group of first phase current in two group of first phase current according to step S120
Value is greater than electric current and sets threshold value, also, obtains the corresponding phase voltage of two group of first phase current according to step S1104 and be all larger than electricity
Pressure setting threshold value, therefore, what the amplitude of the first phase current was greater than electric current setting threshold value is mutually to perfect phase, will perfect phase voltage
As positive sequence polarization voltage.It is remained unchanged before and after failure due to perfecting phase voltage phase, phase voltage will be perfected as just
Sequence polarizing voltage, impedance relay malfunction will not occur in external area error, tripping occur in troubles inside the sample space, reach relay guarantor
The purpose of shield.
Further, if the amplitude of the first phase current is less than electric current and sets 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 greater than electric current setting threshold value, wherein the second phase current is Y/ △
In the three-phase voltage of transformer single ended power supply system, voltage magnitude is less than the corresponding phase electricity of phase voltage of voltage setting threshold value
Stream；If the amplitude of the second phase current, which is greater than electric current, sets threshold value, the corresponding phase voltage of the second phase current is failure phase.Root
According to non-three phase in three-phase voltage and failure phase differentiation as a result, system running state, fault type and fault characteristic can be done into
The analysis of one step.
In conjunction with above-mentioned positive sequence polarization voltage calculation method, the embodiment of the invention also provides a kind of calculating of positive sequence polarization voltage
Device, referring to fig. 4, for a kind of positive sequence polarization electricity applied to Y/ △ transformer single ended power supply system provided in an embodiment of the present invention
Computing device is pressed, which includes:
Single-phase non-three phase breakdown judge module again: for detecting the zero sequence electricity of Y/ △ transformer single ended power supply system power supply side
Flow component, zero sequence voltage component and three-phase voltage amplitude, judge whether Y/ △ transformer single ended power supply system power supply side occurs list
Phase non-three phase failure again.
Specifically, in Y/ △ transformer single ended power supply system power supply side, the residual voltage point of detection A, B, C three-phase voltage
Amount, the amplitude of zero-sequence current component and A, B, C three-phase voltage, if system is there are zero-sequence current component, there is no residual voltages
There are two-phase voltage amplitude is small greater 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 be in single-phase non-full-operating state, and system power supply side have occurred it is single-phase it is non-entirely
Mutually failure again.
Perfect phase judgment module: for when single-phase non-three phase failure again occurs for Y/ △ transformer single ended power supply system power supply side
When, then judge whether the amplitude of the first phase current is greater than electric current setting threshold value, wherein the first phase current is Y/ △ transformer list
It holds in power-supply system source side three-phase voltage, voltage magnitude is greater 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/ △ transformer single ended power supply system power supply side again
Occur single-phase non-three phase again failure when, the corresponding phase current of detection A, B, C three-phase voltage, wherein by three-phase voltage, voltage amplitude
The corresponding phase current of phase voltage that value is greater than voltage setting threshold value is defined as the first phase current, judges the amplitude of the first phase current
Whether it is greater than electric current and sets threshold value, if the amplitude of the first phase current is greater than electric current and sets threshold value, it is strong for judging this mutually
Quan Xiang.
Positive sequence polarization voltage output module: for when the amplitude of the first phase current is greater than electric current setting threshold value, then will
The corresponding phase voltage output of first phase current is positive sequence polarizing voltage.
Specifically, obtaining perfecting phase by perfecting phase judgment module, i.e. the amplitude of the first phase current is greater than electric current setting door
The corresponding phase voltage of threshold value, using the phase voltage as positive sequence polarization voltage, using the phase phase as positive sequence polarization voltage-phase.
In still another embodiment of the process, described device further include:
Non-three phase judgment module: for when the amplitude of the first phase current be less than electric current setting threshold value when, then by the first phase
The corresponding phase voltage of electric current is judged as non-three phase.
Failure phase judgment module: for judging whether the amplitude of the second phase current is greater than electric current setting threshold value, wherein the
Two-phase current is in the three-phase voltage of Y/ △ transformer single ended power supply system, and voltage magnitude is less than the phase electricity of voltage setting threshold value
Press corresponding phase current；
If the amplitude of the second phase current, which is greater than electric current, sets threshold value, the corresponding phase voltage of the second phase current is judged as
Failure phase.
Fig. 5 is the differentiation schematic diagram of a kind of the failure phase and non-three phase shown in an exemplary embodiment according to the present invention.Root
According to the definition of residual voltage and zero-sequence current, as U0 < k1 × Un+I0 × Z0, then residual voltage is not present in decision-making system；When
When 3I0 > k3 × In, then there are zero-sequence currents for decision-making system.As Ub > k2 × Un, i.e. B phase voltage amplitude is set greater than first voltage
Set threshold value then determines that B phase is non-faulting phase；As Uc > k2 × Un, i.e., C phase voltage amplitude is greater than first voltage setting threshold
Value, then determine that C phase is non-faulting phase；As Ua < k4 × Un, i.e. A phase voltage amplitude is less than second voltage setting threshold value, then A phase
It may be failure phase.According to system power supply side there are zero-sequence current, there is no there are two-phase voltages in residual voltage, three-phase voltage
Amplitude is greater 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
Mutually failure again.
Further, when A phase voltage amplitude is less than second voltage setting threshold value, if Ia > k6 × In, i.e. A phase are electric
Stream is greater than the second fault current and sets threshold value, then determines that A phase is failure phase, i.e. system event that single-phase non-three phase failure again occurs
Barrier is mutually A phase；When B phase voltage amplitude is greater than first voltage setting threshold value, if Ib < k5 × In, i.e. B phase current are less than
Fisrt fault electric current sets threshold value, then determines that B phase is non-three phase；Threshold value is set when C phase voltage amplitude is greater than first voltage
When, if Ic < k5 × In, i.e. C phase current are less than Fisrt fault electric current and set threshold value, then determine that C phase is non-three phase.
When A phase is failure phase, B phase is non-three phase, then C phase is to perfect phase, using C phase voltage as positive sequence polarization voltage,
Using C phase voltage phase as positive sequence polarization voltage-phase；When A phase is failure phase, C phase is non-three phase, then B phase is to perfect phase,
Using B phase voltage as positive sequence polarization voltage, using B phase voltage phase as positive sequence polarization voltage-phase.
Fig. 6, Fig. 7 are respectively that B phase is failure phase, when C phase is failure phase, and single-phase non-three phase failure, failure phase occur for system
With the differentiation schematic diagram of non-three phase, differentiate that content is similar to the above embodiments, details are not described herein.
As seen from the above-described embodiment, the calculation method of positive sequence polarization voltage provided by the invention, by detecting Y/ △ transformation
Zero-sequence current component, zero sequence voltage component and the three-phase voltage of device single ended power supply system power supply side, judge whether system occurs list
Failure passes through detection A, B, C three-phase voltage and A, B, C three-phase when single-phase non-three phase failure again occurs for system to phase non-three phase again
Electric current, judgement perfect phase, failure phase and non-three phase, and choose and perfect phase voltage as positive sequence polarization voltage, choose sound mutually electricity
Press phase as positive sequence polarization voltage-phase, phase keeps not, to perfect before failure, after failure due to perfecting phase voltage
Phase voltage effectively prevents distance protection equipment caused by positive sequence polarization voltage-phase deviates outside area as positive sequence polarization voltage
It may improve distance protection equipment protection act there is a situation where tripping may occur when malfunction, troubles inside the sample space when failure and open
The accuracy opened.
Those skilled in the art will readily occur to of the invention its after considering specification and the disclosure invented here of practice
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (8)
1. a kind of calculation method of positive sequence polarization voltage characterized by comprising
By the zero-sequence current component, zero sequence voltage component and the three-phase voltage that detect Y/ △ transformer single ended power supply system power supply side
Amplitude, judges whether the Y/ △ transformer single ended power supply system power supply side occurs single-phase non-three phase failure again；
When single-phase non-three phase failure again occurs for Y/ △ transformer single ended power supply system power supply side, then the first phase current is judged
Amplitude whether be greater than electric current setting threshold value, wherein first phase current be the Y/ △ transformer single ended power supply system
In source side three-phase voltage, voltage magnitude be greater than voltage setting threshold value the corresponding phase current of phase voltage；
If the amplitude of first phase current, which is greater than electric current, sets threshold value, by the corresponding phase voltage of first phase current
As positive sequence polarization voltage.
2. the calculation method of positive sequence polarization voltage according to claim 1, which is characterized in that become by the detection Y/ △
The zero-sequence current component and zero sequence voltage component of depressor single ended power supply system power supply side judge the Y/ △ transformer single ended power supply
Whether system power supply side occurs single-phase non-three phase, and failure includes: again
When Y/ △ transformer single ended power supply system power supply side is broken down, then the Y/ △ transformer single ended power supply system is judged
Source side whether there is zero-sequence current component；
If Y/ △ transformer single ended power supply system power supply side there are the zero-sequence current component, judges that the Y/ △ becomes
Whether depressor single ended power supply system power supply side is not present zero sequence voltage component；
If the zero sequence voltage component is not present in Y/ △ transformer single ended power supply system power supply side, the Y/ △ is judged
In the three-phase voltage of transformer single ended power supply system power supply side, if there are the amplitude of two-phase voltage be greater than voltage setting threshold value,
The amplitude of another phase voltage sets threshold value lower than the voltage；
If in the source side three-phase voltage of the Y/ △ transformer single ended power supply system, there are the amplitudes of two-phase voltage to be greater than institute
State voltage setting threshold value, another phase voltage amplitude lower than the voltage set threshold value, then the Y/ △ transformer is single-ended
Single-phase non-three phase failure again occurs for the source side of power-supply system.
3. the calculation method of positive sequence polarization voltage according to claim 1, which is characterized in that the method also includes:
If the amplitude of first phase current, which is less than electric current, sets threshold value, the corresponding phase electricity of first phase current
Pressure is non-three phase.
4. the calculation method of positive sequence polarization voltage according to claim 1, which is characterized in that the method also includes:
Judge whether the amplitude of the second phase current is greater than electric current setting threshold value, wherein second phase current is the Y/ △
In the three-phase voltage of transformer single ended power supply system, voltage magnitude is less than the corresponding phase of phase voltage of voltage setting threshold value
Electric current；
If the amplitude of second phase current, which is greater than electric current, sets threshold value, the corresponding phase electricity of second phase current
Pressure is failure phase.
5. the calculation method of positive sequence polarization voltage according to claim 1, which is characterized in that the voltage sets threshold value
It is the 80% of three-phase voltage voltage rating.
6. a kind of positive sequence polarization voltage computing device characterized by comprising
Single-phase non-three phase breakdown judge module again: for detecting the zero-sequence current point of Y/ △ transformer single ended power supply system power supply side
Amount, zero sequence voltage component and three-phase voltage amplitude, judge whether the Y/ △ transformer single ended power supply system power supply side occurs list
Phase non-three phase failure again；
Perfect phase judgment module: for when single-phase non-three phase failure again occurs for Y/ △ transformer single ended power supply system power supply side
When, then judge whether the amplitude of the first phase current is greater than electric current setting threshold value, wherein first phase current is the Y/ △
In the three-phase voltage of transformer single ended power supply system power supply side, voltage magnitude be greater than voltage setting threshold value the corresponding phase of phase voltage
Electric current；
Positive sequence polarization voltage output module: for when the amplitude of first phase current is greater than electric current setting threshold value, then will
The corresponding phase voltage output of first phase current is positive sequence polarizing voltage.
7. positive sequence polarization voltage computing device according to claim 6, which is characterized in that described device further include:
Non-three phase judgment module: for when the amplitude of first phase current is less than electric current setting threshold value, then by described the
The corresponding phase voltage of one phase current is judged as non-three phase.
8. positive sequence polarization voltage computing device according to claim 6, which is characterized in that described device further include:
Failure phase judgment module: for judging whether the amplitude of the second phase current is greater than electric current setting threshold value, wherein described the
Two-phase current is in the three-phase voltage of the Y/ △ transformer single ended power supply system, and voltage magnitude is less than the voltage and sets threshold
The corresponding phase current of the phase voltage of value；
If the amplitude of second phase current, which is greater than electric current, sets threshold value, the corresponding phase electricity of second phase current
Pressure is judged as failure phase.
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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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| 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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