CN105743105B - A kind of polygon distancing element and relay protecting method for adapting to power system oscillation - Google Patents
A kind of polygon distancing element and relay protecting method for adapting to power system oscillation Download PDFInfo
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- CN105743105B CN105743105B CN201610134767.2A CN201610134767A CN105743105B CN 105743105 B CN105743105 B CN 105743105B CN 201610134767 A CN201610134767 A CN 201610134767A CN 105743105 B CN105743105 B CN 105743105B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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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- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of polygon distancing element and relay protecting method for adapting to power system oscillation; after protection starts; it if measuring impedance once in distancing element positive direction area, and hereafter measures impedance and falls into 120 °~135 ° impedance ranges of the second quadrant, be still judged to impedance troubles inside the sample space.Measurement impedance is protected after falling into the second quadrant more than 135 ° and returned.If measurement impedance had not been fallen into the positive direction area of distancing element, and was fallen directly into the range of 120 °~135 ° of the second quadrant, impedance external area error is judged to.The distancing element in the case where circuit external area error is with vibration, can accelerate the responsiveness of distance protection.
Description
Technical field
The application belongs to field of power, more particularly to a kind of relay protection and method and relay protection distance element
Part.
Background technology
The earliest digital milliteslamter in China is exactly the distancing element for having used polygon characteristic, the main spy of the element
Point is that reactance definite value and resistance definite value can be adjusted flexibly respectively, and band transition resistance ability is stronger, and can be used as line end
Remote back-up protection during step down side failure.The design of its polygon characteristic and its all quadrants angle also experienced nearly 30 years
Operation test, have for a long time abundant onsite application experience.
But various distancing elements, all can according to field operation experiences, continuously improve it is perfect, to adapt to the operation of various complexity
Condition.
For example, have many power supplys and regional loading zone in power grid, if regional load and power supply Weak link,
Failure is not cut off quickly, and power grid is susceptible to vibration in failure；In addition, if load is very heavy, may cause to vibrate.So
System in, if low-pressure side breaks down, and Low-side faults are not cut off in time, it is necessary to by associated high voltage side route protection
Cut off failure.High-voltage line protection is mainly configured with pilot protection, distance protection and zero-sequenceprotection.Circuit external area error, high pressure
The pilot protection akinesia of circuit, I section of distance, I section of zero sequence be not in active region.If three-phase shortcircuit, without zero-sequence component
In the case of, the II section of protection of standby distance or III of Distance section protection act can only be passed through.Because of the protection without quick acting, failure
It does not cut off in time, it is possible that situation of the external area error with vibration.
External area error adjoint system vibrates, and when there are the special circumstances that locus of impedance changes greatly, locus of impedance may
Distance protection can be caused to have and returned and deferred action beyond the active region of the second quadrant of distancing element of original polygon.Together
The sector protection having time matching relationship of one circuit, the distance protection actuation time definite value of adjacent lines also have cooperation to close
System if the high-voltage line protection action close to trouble point has delay, may cause in the more remote distance protection action in trouble point,
Expand accident scope.
The present invention proposes a kind of polygon distancing element and relay protecting method for adapting to power system oscillation, in circuit
In the case that external area error is with vibration, distance protection can be acted by normal time, prevent fault spread scope.
The content of the invention
In the case of preventing circuit external area error with vibration, the possible deferred action of polygon distancing element, the present invention
A kind of polygon distancing element and relay protecting method available for system oscillation is proposed, it can using the distance protection of the element
To press normal time action.
The following technical term used in the present invention is illustrated or defined first：
Control word：It the input of some functions or exits in order to control, there is provided control words.For the distance of adaptive system vibration
Element function, distance protection are provided with " distancing element of adaptive system vibration " control word, when the control word is put into, adapt to system
The distancing element function of vibrating of uniting is effective；When the control word exits, the distancing element function of adaptive system vibration is invalid.Electric power
The traffic department of system, according to the parameter and service requirement of specific electric system, by calculate analysis provide it is required each mutually whole
Definite value and control word., it is necessary to put into that " adaptive system vibrates in the case that regional load and power supply Weak link or load are very heavy
Distancing element " control word, otherwise do not put into the control word.
Reactance definite value and resistance definite value：Impedance value includes reactive component and resistive component.The reactance of polygon distancing element
Definite value and resistance definite value are adjusted respectively.The reactance definite value of I section of distance, II section of distance and III of Distance segment element be typically it is different,
The reactance definite value of each section of single-phase earthing distancing element and phase spacing element may be different, but the resistance definite value of all distancing elements
It is identical.In the complex plane of R-X, resistance R is transverse axis, reactance X is the longitudinal axis.RDZ on R axis is resistance definite value, in X-axis
XDZ is respectively the reactance definite value of each distancing element.
It is of the invention specifically to use following technical scheme.
A kind of polygon distancing element of adaptive system vibration, the acting characteristic of the distancing element is polygon；It is special
Sign is：
The distancing element of vibration " adaptive system " control word is set in distance protection, the polygon distancing element according to
The throwing of " distancing element of adaptive system vibration " control word is moved back situation and is realized using different acting characteristic equations and Protection criteria
Adaptive guard.
During input " distancing element of adaptive system vibration " control word, the acting characteristic equation of the polygon distancing element
For：In the complex plane of R-X, first quartile tilts down angle [alpha] at the reactance definite value XDZ in reactance X-axis and makees first straight line
Section, the angle β that is inclined upwardly at the resistance definite value RDZ on resistance R axis makees second straight line section；Second quadrant inclines from origin O
90 ° of+ε of rake angle make the 3rd straightway, make the 4th straight line parallel to resistance R axis to the left at the reactance definite value XDZ in reactance X-axis
Section；Fourth quadrant makees the 5th straightway from origin O angles of inclination for-γ, at the resistance definite value RDZ on resistance R axis to
Under parallel to reactance X-axis make the 6th straightway；It is polygon that described first to the 6th straightway, which intersects in surrounded closed area,
Operating space of the shape Distance Protection Components when control word is put into；
When not putting into " distancing element of adaptive system vibration " control word, the acting characteristic of the polygon distancing element
Equation is, in the complex plane of R-X, first quartile tilts down angle [alpha] at the reactance definite value XDZ in reactance X-axis and makees first
Straightway, the angle that is inclined upwardly at the resistance definite value RDZ on resistance R axis make second straight line section；Second quadrant goes out from origin O
It sends out angle of inclination and makees the 7th straightways for 90 ° of+δ, to the left parallel to resistance R axis work the from the reactance definite value XDZ in reactance X-axis at
Four straightways；Fourth quadrant makees the 5th straightway, the resistance definite value on resistance R axis from origin O angles of inclination for-γ
Make the 6th straightway parallel to reactance X-axis downwards at RDZ；Described first, second, the four, the five, the six, the 7th straightway institutes
The closed area surrounded is operating space of the polygon Distance Protection Components when control word is not put into.
The present invention still further comprises following preferred embodiment：
When control word is put into, the positive direction scope of impedance as defined in polygon distancing element includes：Measurement impedance is located at
In first quartile, in the range of 90 °~90 °+ε of the second quadrant, the operating space scope in the range of fourth quadrant-γ~0 °.
If measuring impedance in the range of the operating space of defined impedance positive direction, judge that event in area has occurred in circuit
Barrier；
If measurement impedance once in defined impedance positive direction operating space, and hereafter measure impedance fall into second as
In the range of limiting 90 ° of+ε~90 °+ξ, and reactance value is less than reactance definite value XDZ, still judges that troubles inside the sample space occurs for circuit；
If measurement impedance had not been fallen into the positive direction operating space of impedance operator, and fell directly into 90 ° of+ε of the second quadrant
In the range of~90 ° of+ξ, then still judge external area error has occurred.
In input " distancing element of adaptive system vibration " control word, the value range of angle [alpha] is 7 °~10 °, angle beta
Value range for 45 °~60 °, the value range that angle is ε is 15 °~30 °, and the value range of angle γ is 15 °~30 °,
The value range of angle ξ is 30 °~45 °.
The angle [alpha] is preferably 7 °, and β is 60 °, and ε is 30 °, and γ is 15 °, and ξ is 45 °.
When not putting into " distancing element of adaptive system vibration " control word, impedance as defined in polygon distancing element is square
To scope include measurement impedance be located in first quartile, in the range of 90 °~90 °+δ of the second quadrant, fourth quadrant-γ~0 ° scope
Interior operating space scope, wherein δ<ε.
If measuring impedance in the range of defined impedance positive direction operating space, judge that event in area has occurred in circuit
Barrier；
If measuring impedance beyond defined positive direction operating space scope, judge that external area error has occurred in circuit.
When " distancing element of adaptive system vibration " control word exits, the value range of angle [alpha] is 7 °~10 °, angle beta
Value range for 45 °~60 °, the value range that angle is δ is 10 °~15 °, and the value range of angle γ is 15 °~30 °,
The value range of angle ε is 15 °~30 °.
The angle [alpha] is preferably 7 °, and β is 60 °, and δ is 15 °, and γ is 15 °, and ε is 30 °.
Disclosed herein as well is a kind of relay protecting method of adaptive system vibration, technical solution is as follows：
It is a kind of adapt to power system oscillation relay protecting method, which is characterized in that the relay protecting method include with
Lower step：
(1) the CT secondary currents of line protective devices installation place are measured in real time, including A phase currents, B phase currents, C phases electricity
Stream, zero-sequence current；The secondary voltage of measurement line protective devices installation place in real time, including A phase voltages, B phase voltages, C phase voltages；
Resistance measuring element calculates the measurement impedance of circuit, including A phase of impedance, B phases in real time according to the secondary voltage and secondary current
Impedance, C phase of impedance, AB phase to phase impedance, BC phase to phase impedance, CA phase to phase impedance.
(2) differentiate whether route protection starts according to secondary current value；
(3) after protection starts, differentiate whether " distancing element of adaptive system vibration " control word puts into；
(4) when " distancing element of adaptive system vibration " control word input,
4.1 judge to measure impedance whether in impedance positive direction operating space, if be not judged to always in this region
External area error；If in this region, into 4.2；
4.2 judge to measure whether impedance is continuously in impedance positive direction operating space, if it is, judging circuit
Troubles inside the sample space, otherwise into 4.3；
If 4.3 measurement impedances were once fallen into impedance positive direction operating space, then measure impedance and fall into the second quadrant
In the range of 120 °~135 °, while reactance value is measured less than reactance definite value XDZ, still sentence circuit and troubles inside the sample space has occurred, otherwise sentence
Break and external area error has occurred for circuit；
4.4 troubles inside the sample spaces act tripping after persistently reaching the protection definite value time, and trip protection cuts off failure；When judging line
When external area error has occurred in road, protection act is not sent；
(5) when " distancing element of adaptive system vibration " control word exits,
When measurement impedance is fallen into impedance positive direction operating space, then judge that troubles inside the sample space has occurred in circuit, when in area
After failure persistently reaches the protection definite value time, protection act tripping cuts off failure, and otherwise protection returns.
Further preferably：
In step (3), in " distancing element of adaptive system vibration " control word input, polygon distancing element regulation
The positive direction scope of impedance include：Measurement impedance be located at first quartile is interior, in the range of 90 °~120 ° of the second quadrant, four-quadrant
In the range of -15 °~0 ° of limit, and meet definite value requirement.
When " distancing element of adaptive system vibration " control word exits, the pros of impedance as defined in polygon distancing element
Include to scope：Impedance positive direction scope as defined in polygon distancing element include measurement impedance be located at first quartile it is interior, second
In the range of 90 °~105 ° of quadrant, the operating space in the range of -15 ° of fourth quadrant~0 °.
The application has technique effect beneficial below：
Polygon distancing element with adaptive system vibration adaptively increases the actuating range of impedance positive direction,
In the case where circuit external area error is with vibration, even if the locus of impedance of measurement has a greater change, still ensure that distance is protected
Shield is acted by normal time.
Description of the drawings
Fig. 1 is a kind of impedance positive direction characteristic schematic diagram of the polygon distancing element of adaptive system vibration；
Fig. 2 is the relay protecting method flow chart based on polygon distancing element.
Specific embodiment
Technical scheme is described in further details with reference to Figure of description.
Fig. 1 is a kind of impedance positive direction characteristic schematic diagram of the polygon distancing element of adaptive system vibration.
(1) input " distancing element of adaptive system vibration " control word is at this time, it may be necessary to consider power system oscillation situation.
The acting characteristic equation of distancing element during input " distancing element of adaptive system vibration " control word is, in R-X
Complex plane in, first quartile tilts down angle [alpha] at the reactance definite value XDZ in reactance X-axis and makees first straight line section, in electricity
The angle β that is inclined upwardly at resistance definite value RDZ on resistance R axis makees second straight line section, and more than two lines section intersects at point D；Second as
Limit, from origin O, the 3rd straightway is made in angle of inclination for 90 ° of+ε, parallel to the left at the reactance definite value XDZ in reactance X-axis
Make the 4th straightway in resistance R axis, more than two lines section intersects at point B；Fourth quadrant, from origin O, angle of inclination for-
γ make the 5th straightway, the resistance definite value RDZ on resistance R axis place downwards parallel to reactance X-axis work the 6th straightway, more than two
Line segment intersection is in point E.
First to the 6th straightway intersects in surrounded closed area to be thrown for polygon Distance Protection Components in control word
Fashionable operating space.
When control word is put into, the positive direction scope of impedance as defined in polygon distancing element includes：Measurement impedance is located at
In first quartile, in the range of 90 °~90 °+ε of the second quadrant, the operating space scope in the range of fourth quadrant-γ~0 °.
If measuring impedance in the range of the operating space of defined impedance positive direction, judge that event in area has occurred in circuit
Barrier；If measuring impedance once in defined impedance positive direction operating space, and hereafter measure impedance and fall into 90 ° of the second quadrant
In the range of+the ξ of+ε~90 °, and reactance value is less than reactance definite value XDZ, still judges that troubles inside the sample space occurs for circuit；If measure impedance not
Once fell into the positive direction operating space of impedance operator, and in the range of falling directly into 90 ° of+ε~90 °+ξ of the second quadrant, then still
So judge external area error has occurred.
In input control word, it is generally the case that the value range of angle [alpha] is 7 °~10 °, and the value range of angle beta is
45 °~60 °, the value range that angle is ε is 15 °~30 °, and the value range of angle γ is 15 °~30 °, the value model of angle ξ
It encloses for 30 °~45 °.Transitory waveform in order to prevent, angle [alpha] are preferably 7 °.
Line impedance angle is generally larger than 60 °, and angle beta is preferably 60 °.Under normal circumstances, during positive direction failure, measurement resistance
It is anti-to fall into first quartile；Reverse direction failure, measurement impedance can fall into third quadrant.It with vibration and is helped in view of failure
Situations such as increasing, measurement impedance may be more than 90 °, into the second quadrant.Therefore, the second quadrant positive direction is arranged to angle of inclination
ε is the OB lines in Fig. 1, and ε is preferably 30 °, ensures that distance protection is operating normally during positive direction failure.
High resistance earthing fault, due to the measured deviation of electric current and voltage, measurement impedance may fall into fourth quadrant, because
This, fourth quadrant positive direction is arranged to angle of inclination γ, is the OE lines in Fig. 1, and γ is preferably 15 °, ensures high resistance earthing fault
When distance protection be operating normally.
Failure with vibration when, the locus of impedance of measurement may change greatly, when failure starts impedance fall into positive direction area
It is interior, but when chromic trouble is not cut off, the locus of impedance of measurement may be more than 120 ° of the second quadrant, therefore by impedance at this time
The second quadrant of positive direction is set to angle of inclination ζ, i.e. OC lines in Fig. 1, ζ is preferably 45 °.
If measuring impedance once in positive direction area, and hereafter measure 120 °~135 ° scopes that impedance falls into the second quadrant
Interior, measurement reactance value is less than definite value XDZ, is still judged to impedance troubles inside the sample space, and after measurement impedance angle is more than 135 °, protection returns, because
This distancing element adaptively increases the actuating range of impedance positive direction, increases drop-off to pick-up radio, in circuit external area error
In the case of vibration, measurement impedance is not in fall into a little while in area, fall into multiple round-trip situation outside area a little while,
Ensure that distance protection is acted by normal time.
If measurement impedance had not been fallen into the positive direction area of impedance operator, and fell directly into 120 °~135 ° of the second quadrant
It is interior, it is judged to impedance external area error.It ensure that positive direction failure and reverse direction failure have apparent interval region.
(2) " distancing element of adaptive system vibration " control word is exited
There is oscillatory condition at this time without considering system.
The acting characteristic equation of distancing element when exiting " distancing element of adaptive system vibration " control word is, in R-X
Complex plane in, first quartile tilts down angle [alpha] at the reactance definite value XDZ in reactance X-axis and makees first straight line section, in electricity
The angle β that is inclined upwardly at resistance definite value RDZ on resistance R axis makees second straight line section, and more than two lines section intersects at point D；Second as
Limit, from origin O, the 7th straightway is made in angle of inclination for 90 ° of+δ, parallel to the left at the reactance definite value XDZ in reactance X-axis
Make the 4th straightway in resistance R axis, more than two lines section intersects at point A；Fourth quadrant, from origin O, angle of inclination for-
γ make the 5th straightway, the resistance definite value RDZ on resistance R axis place downwards parallel to reactance X-axis work the 6th straightway, more than two
Line segment intersection is in point E.
First, secondth, the closed area that the four, the five, the six, the 7th straightways are surrounded is polygon distance protection member
Operating space of the part when control word is not put into.
When not putting into " distancing element of adaptive system vibration " control word, impedance as defined in polygon distancing element is square
To scope include measurement impedance be located in first quartile, in the range of 90 °~90 °+δ of the second quadrant, fourth quadrant-γ~0 ° scope
Interior operating space scope, wherein δ<ε.
If measuring impedance in the range of defined impedance positive direction operating space, judge that event in area has occurred in circuit
Barrier；If measuring impedance beyond defined positive direction operating space scope, judge that external area error has occurred in circuit.
When " distancing element of adaptive system vibration " control word exits, the value range of angle [alpha] is 7 °~10 °, angle beta
Value range for 45 °~60 °, the value range that angle is δ is 10 °~15 °, and the value range of angle γ is 15 °~30 °,
The value range of angle ε is 15 °~30 °.
Angle [alpha] is preferably 7 °, and β is 60 °, and γ is 15 °, and ε is 30 °.Angle δ is preferably 15 °, is the OA lines in Fig. 1.
As long as the angle that measurement impedance falls into the second quadrant is more than 105 °, protection is judged to external area error, ensure that positive direction
Failure and reverse direction failure have larger interval region, protect action message.
Fig. 2 is the relay protecting method flow chart based on polygon distancing element.
A kind of relay protecting method of adaptation power system oscillation of the application comprises the following steps：
Step 1：The CT secondary currents of measurement line protective devices installation place in real time, including A phase currents, B phase currents, C phases
Electric current and zero-sequence current；The secondary voltage of measurement line protective devices installation place in real time, including A phase voltages, B phase voltages, C phases
Voltage；Resistance measuring element calculates the measurement impedance of circuit, including A phase resistances in real time according to the secondary voltage and secondary current
Anti-, B phase of impedance, C phase of impedance, AB phase to phase impedance, BC phase to phase impedance, CA phase to phase impedance.
The CT secondary currents of protection are mainly used for differentiating that protection starts and calculate measurement impedance etc..
The voltage of protection is mainly used for calculating measurement impedance.
Resistance measuring element calculates counterpart impedance value with real-time voltage, real-time current.Single-phase earthing fault uses failure phase
Measurement impedance, if phase-to phase fault is just using the alternate measurement impedance of failure.
The acting characteristic equation of each distancing element is identical.
Step 2：Protection differentiates whether protection starts according to secondary current value.
During grid collapses, secondary current protects startup after reaching jump-value of current definite value；If electric current is slowly varying, dash forward
Variable current cannot start, and when secondary current reaches quiet steady unstability current ration, protection can also start.
After protection starts, exception handles could be entered.
Step 3：After protection starts, differentiate whether " distancing element of adaptive system vibration " control word puts into.The control word
During input, the distancing element of adaptive system vibration is effective；When the control word exits, the distancing element of adaptive system vibration is invalid.
Step 4：During the distancing element of vibration " adaptive system " control word input, impedance positive direction scope includes, first as
In limit, the second quadrant, in the range of 90 °~120 °, fourth quadrant, in the range of -15 °~0 °, and meet definite value requirement.
Measurement impedance is fallen into impedance positive direction operating space, then judges that troubles inside the sample space has occurred in circuit.Otherwise it is judged as
External area error has occurred in circuit.
During failure, measurement impedance may be fallen into sometimes in the positive direction area, fallen into sometimes outside its area, but if measurement resistance
Resist the interior duration in the impedance positive direction operating space, reached the distance protection definite value time, met protection act
Condition, protection act cut off failure.
After protection starts, if measurement impedance was once fallen into the impedance positive direction operating space, and resistance is hereafter measured
It is anti-to fall into the range of 120 °~135 ° of the second quadrant, measure reactance and be less than reactance definite value XDZ, impedance troubles inside the sample space is still judged to,
Otherwise it is judged as that external area error has occurred in circuit.When judging that external area error has occurred in circuit, protection act is not sent.
Impedance positive direction operating space at this time has reached 135 ° in the second quadrant, adaptively increases impedance positive direction
Actuating range.
During failure, measurement impedance may be fallen into sometimes comprising in 120 °~135 ° of positive direction area, fallen into sometimes outside area,
But if measuring impedance duration in this impedance positive direction operating space, the distance protection definite value time is reached, has protected
Action cuts off failure.
Step 5：When " distancing element of adaptive system vibration " control word exits, protected with original polygon distancing element characteristic
It holds unanimously, convenient for coordinating with the whole network.Impedance positive direction scope at this time includes, in first quartile, the second quadrant, 90 °~105 °
In the range of, the operating space in the range of -15 ° of fourth quadrant~0 °.
After protection starts, when measurement impedance is fallen into the range of the positive direction operating space, impedance troubles inside the sample space is judged to.Otherwise
It is judged as that external area error has occurred in circuit.
During failure, measurement impedance may be sometimes fallen into positive direction area, fallen into sometimes outside area, but if measurement impedance exists
Duration in the positive direction area has reached the distance protection definite value time, and protection act cuts off failure, and otherwise protection returns.
Example given above not makees in any form the present invention to illustrate the present invention and its practical application
Limitation, any one professional and technical personnel in the range of without departing from technical solution of the present invention, according to more than technology and
Method makees certain modification and change when the equivalent embodiment for being considered as equivalent variations.
Claims (12)
1. a kind of polygon distancing element of adaptive system vibration, the acting characteristic of the distancing element is polygon；Its feature
It is：
" distancing element of adaptive system vibration " control word is set in distance protection, and the polygon distancing element is according to " suitable
Answer the distancing element of system oscillation " throwing of control word move back situation realized using different acting characteristic equations and Protection criteria it is adaptive
It should protect；
During input " distancing element of adaptive system vibration " control word, the acting characteristic equation of the polygon distancing element is：
In the complex plane of R-X, first quartile tilts down angle [alpha] at the reactance definite value XDZ in reactance X-axis and makees first straight line section,
The angle β that is inclined upwardly at resistance definite value RDZ on resistance R axis makees second straight line section；Second quadrant is tilted from origin O
90 ° of+ε of angle make the 3rd straightway, make the 4th straight line parallel to resistance R axis to the left at the reactance definite value XDZ in reactance X-axis
Section；Fourth quadrant makees the 5th straightway from origin O angles of inclination for-γ, at the resistance definite value RDZ on resistance R axis to
Under parallel to reactance X-axis make the 6th straightway；It is polygon that described first to the 6th straightway, which intersects in surrounded closed area,
Operating space of the shape Distance Protection Components when control word is put into；
When not putting into " distancing element of adaptive system vibration " control word, the acting characteristic equation of the polygon distancing element
For in the complex plane of R-X, first quartile tilts down angle [alpha] at the reactance definite value XDZ in reactance X-axis and makees first straight line
Section, the angle that is inclined upwardly at the resistance definite value RDZ on resistance R axis makees second straight line section；Second quadrant inclines from origin O
Rake angle makees the 7th straightway for 90 ° of+δ, makees the 4th directly parallel to resistance R axis to the left at the reactance definite value XDZ in reactance X-axis
Line segment；Fourth quadrant, from origin O angles of inclination for-γ the 5th straightways of work, at the resistance definite value RDZ on resistance R axis
Make the 6th straightway parallel to reactance X-axis downwards；Described first, second, the four, the five, the six, the 7th straightways are surrounded
Closed area is operating space of the polygon Distance Protection Components when control word is not put into.
2. the polygon distancing element of adaptive system vibration according to claim 1, it is characterised in that：
When control word is put into, the positive direction scope of impedance as defined in polygon distancing element includes：It measures impedance and is located at first
In quadrant, in the range of 90 °~90 °+ε of the second quadrant, the operating space scope in the range of fourth quadrant-γ~0 °.
3. the polygon distancing element of adaptive system vibration according to claim 2, it is characterised in that：
When control word is put into, if measurement impedance judges circuit in the range of the operating space of defined impedance positive direction
Troubles inside the sample space has occurred；
If measuring impedance once in defined impedance positive direction operating space, and hereafter measure impedance and fall into the second quadrant
In the range of 90 ° of+ε~90 °+ξ, and reactance value is less than reactance definite value XDZ, still judges that troubles inside the sample space occurs for circuit；
If measurement impedance had not been fallen into the positive direction operating space of impedance operator, and fell directly into 90 ° of+ε~90 ° of the second quadrant
In the range of+ξ, then still judge external area error has occurred.
4. the polygon distancing element of adaptive system vibration according to claim 3, it is characterised in that：
In input " distancing element of adaptive system vibration " control word, the value range of angle [alpha] is 7 °~10 °, and angle beta takes
It is 45 °~60 ° to be worth scope, and the value range that angle is ε is 15 °~30 °, and the value range of angle γ is 15 °~30 °, angle ξ
Value range be 30 °~45 °.
5. the polygon distancing element of adaptive system vibration according to claim 4, it is characterised in that：
The angle [alpha] is preferably 7 °, and β is 60 °, and ε is 30 °, and γ is 15 °, and ξ is 45 °.
6. the polygon distancing element of the adaptive system vibration according to claim 1-5 any claims, feature exist
In：
When not putting into " distancing element of adaptive system vibration " control word, impedance positive direction model as defined in polygon distancing element
It encloses and is located at including measurement impedance in first quartile, in the range of 90 °~90 °+δ of the second quadrant, in the range of fourth quadrant-γ~0 °
Operating space scope, wherein δ<ε.
7. the polygon distancing element of adaptive system vibration according to claim 6, it is characterised in that：
When not putting into " distancing element of adaptive system vibration " control word, if measurement impedance is moved in defined impedance positive direction
Make in regional extent, then judge that troubles inside the sample space has occurred in circuit；
If measuring impedance beyond defined positive direction operating space scope, judge that external area error has occurred in circuit.
8. the polygon distancing element of adaptive system vibration according to claim 7, it is characterised in that：
When " distancing element of adaptive system vibration " control word exits, the value range of angle [alpha] is 7 °~10 °, and angle beta takes
It is 45 °~60 ° to be worth scope, and the value range that angle is δ is 10 °~15 °, and the value range of angle γ is 15 °~30 °, angle ε
Value range be 15 °~30 °.
9. the polygon distancing element of adaptive system vibration according to claim 8, it is characterised in that：
The angle [alpha] is preferably 7 °, and β is 60 °, and δ is 15 °, and γ is 15 °, and ε is 30 °.
10. a kind of relay protecting method for adapting to power system oscillation, which is characterized in that the relay protecting method includes following
Step：
(1) the CT secondary currents of line protective devices installation place are measured in real time, including A phase currents, B phase currents, C phase currents, zero
Sequence electric current；The secondary voltage of measurement line protective devices installation place in real time, including A phase voltages, B phase voltages, C phase voltages；Impedance
Measuring cell calculates the measurement impedance of circuit, including A phase of impedance, B phase resistances in real time according to the secondary voltage and secondary current
Anti-, C phase of impedance, AB phase to phase impedance, BC phase to phase impedance, CA phase to phase impedance；
(2) differentiate whether route protection starts according to secondary current value；
(3) after protection starts, differentiate whether " distancing element of adaptive system vibration " control word puts into；
(4) when " distancing element of adaptive system vibration " control word input,
4.1 judge to measure impedance whether in impedance positive direction operating space, if be not judged to always in this region outside area
Failure；If in this region, into 4.2；
4.2 judge to measure whether impedance is continuously in impedance positive direction operating space, if it is, judging that area has occurred in circuit
Internal fault, otherwise into 4.3；
If 4.3 measurement impedances once fell into impedance positive direction operating space, then measure impedance fall into 120 ° of the second quadrant~
In the range of 135 °, while reactance value is measured less than reactance definite value XDZ, still sentence circuit and troubles inside the sample space has occurred, be otherwise judged as line
External area error has occurred in road；
4.4 troubles inside the sample spaces act tripping after persistently reaching the protection definite value time, and trip protection cuts off failure；When judge circuit send out
When having given birth to external area error, protection act is not sent；
(5) when " distancing element of adaptive system vibration " control word exits,
When measurement impedance is fallen into impedance positive direction operating space, then judge that troubles inside the sample space has occurred in circuit, works as troubles inside the sample space
After persistently reaching the protection definite value time, protection act tripping cuts off failure, and otherwise protection returns.
11. the relay protecting method according to claim 10 for adapting to power system oscillation, it is characterised in that：
In step (4), in " distancing element of adaptive system vibration " control word input, resistance as defined in polygon distancing element
Anti- positive direction scope includes：Measurement impedance be located at first quartile is interior, in the range of 90 °~120 ° of the second quadrant, fourth quadrant-
In the range of 15 °~0 °, and meet definite value requirement.
12. the relay protecting method of the adaptation power system oscillation according to claim 10 or 11, it is characterised in that：
In step (5), when " distancing element of adaptive system vibration " control word exits, resistance as defined in polygon distancing element
Anti- positive direction scope includes：Impedance positive direction scope as defined in polygon distancing element includes measurement impedance and is located at first quartile
In the range of interior, 90 °~105 ° of the second quadrant, the operating space in the range of -15 ° of fourth quadrant~0 °.
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| CN113300341A (en) * | 2021-06-11 | 2021-08-24 | 国网山东省电力公司莱芜供电公司 | Distance protection method based on static synchronous compensator |
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| CN1167994A (en) * | 1996-01-04 | 1997-12-17 | 斯维则工程实验室公司 | Protective relay having out-of-step logic capability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1167994A (en) * | 1996-01-04 | 1997-12-17 | 斯维则工程实验室公司 | Protective relay having out-of-step logic capability |
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| Title |
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| 距离Ⅲ段保护特性研究与整定计算;瞿迪庆;《中国电力》;20151031;第48卷(第10期);第113-117页 * |
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