CN104035030A - Calibration method and system of admittance type excitation loss protection device - Google Patents
Calibration method and system of admittance type excitation loss protection device Download PDFInfo
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Abstract
An embodiment of the invention discloses a calibration method and system of an admittance type excitation loss protection device. The calibration method utilizes a conversion module to perform automatic matching of a calibration device and the admittance type excitation loss protection device and successively achieves the purpose of utilizing the calibration device to automatically calibrate the admittance type excitation loss protection device. The calibration method and system has the advantages that the problem that several action points for admittance type excitation loss protection can be manually calibrated by adopting a transitional calibration method and a whole admittance constant value track cannot be verified is solved. The whole admittance constant value track is verified by adopting the calibration method, excitation loss protection reliable action trip after a generator is loss of excitation is ensured, and powerful guarantee is provided for stable running of the generator and a power system.
Description
Technical field
The present invention relates to the method for calibration of field loss protection system, relate in particular to a kind of method of calibration of admittance type field loss protection system.
Background technology
When loss of exicitation refers to generator operation, lose exciting current, after loss of exicitation, will cause system voltage to decline from system absorbing reactive power significantly, affect system safety operation.After loss of exicitation, generator unit stator electric current will increase, and send active power the more before loss of excitation, and the increase of loss of excitation after-current the more, causes generator stator end leakage field to increase, and causes the overheating of end windings and parts.In addition, after loss of exicitation, between rotor and stator field, there is velocity contrast, in Generator's Rotor Circuit, occur that difference frequency electric current causes rotor local overheated.
And high-rating generator excitation system link is a lot, any one link occurs extremely all can causing loss of exicitation, and therefore, Loss of Excitation Protection is the necessary device of guaranteeing electricity generation system stable power-supplying.Loss of Excitation Protection is used for after loss of exicitation by generator off-the-line, to prevent that loss of excitation aggravation from causing that generator step-out even causes electricity generation system concussion.
Conventional high-rating generator Loss of Excitation Protection has two types: impedance type Loss of Excitation Protection and admittance type Loss of Excitation Protection.The application of impedance type Loss of Excitation Protection is very extensive; domestic and international most of Loss of Excitation Protection is all impedance type; the definite value track of impedance type field loss protection is two impedance circles; the protection fixed value checking method of Loss of Excitation Protection is very simple, and can utilize existing calibration equipment to realize automatic Verification.
Yet Siemens Company has but developed a kind of admittance type Loss of Excitation Protection, the protection definite value of admittance type Loss of Excitation Protection more can be reacted the truth after loss of exicitation, and therefore, admittance type Loss of Excitation Protection is occupying the increasing market share.But; the protection definite value track of admittance type Loss of Excitation Protection is admittance straight line and/or admittance ray, rather than impedance circle, and admittance definite value track stretches to infinity point in admittance plane; existing method of calibration cannot be verified whole admittance definite value track, the manually several operating points of verification.
Although the field loss protection of admittance type more can be reacted the machine end admittance change track after loss of exicitation, existing method of calibration efficiency is low, poor reliability, cannot verify the admittance loci of field loss protection, cannot guarantee field loss protection action message after loss of exicitation.
Summary of the invention
Embodiment of the present invention technical matters to be solved is that the protection fixed value checking of existing admittance type Loss of Excitation Protection can only and cannot verify whole admittance loci by the several definite value points of manual verification, and method of calibration efficiency is low, poor reliability.The invention provides a kind of method of calibration and system of admittance type Loss of Excitation Protection, can the whole admittance loci of automatic Verification.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of method of calibration of admittance type Loss of Excitation Protection, it is characterized in that, comprises the following steps:
S1. modular converter converts the field loss protection per unit admittance of design tuning to admittance famous value, then admittance loci corresponding to the famous value of admittance is converted to the locus of impedance in impedance plane;
S2. the locus of impedance providing according to described modular converter the test parameters of calibration equipment and test connection are set so that the automatic output voltage of described calibration equipment and electric current to admittance type Loss of Excitation Protection;
S3. described admittance type Loss of Excitation Protection is according to the voltage and current triggering field loss protection action of input and to described calibration equipment feedback action point impedance value;
S4. described calibration equipment records received operating point resistance value and in coordinate plane, generates operating point locus of impedance.
Further comprising the steps of after described step S4:
S5. derive the resistance value data and the operating point track that is positioned at coordinate plane of described calibration equipment record;
S6. the action impedance locus of points of described calibration equipment record is compared with the locus of impedance that described modular converter provides, to verify whether the protection working value of described admittance type Loss of Excitation Protection meets actual designing requirement.
Described step S1 specifically comprises following operation:
S11, according to the reference value of the per unit admittance of design tuning and described admittance type Loss of Excitation Protection, calculate the famous value of admittance, the wherein famous value=per unit admittance * reference value of admittance;
S12, according to the famous value computing impedance of admittance value, wherein resistance value is the inverse of the famous value of admittance;
S13, the admittance loci in field loss protection admittance plane is converted to the locus of impedance in impedance plane.
Described step S2 specifically comprises following operation:
S21, described calibration equipment enter impedance type Loss of Excitation Protection checking mode;
S22, the locus of impedance providing according to described conversion equipment, arrange spacing and the distribution range of action radius, impedance central coordinate of circle and the testing site of impedance circle by described calibration equipment;
S23, the voltage and current output loop of described calibration equipment is connected to the voltage and current loop of described admittance type Loss of Excitation Protection so that the voltage and current of described calibration equipment output is input to described admittance type Loss of Excitation Protection;
S24, admittance type field loss protection action connection point is connected to opening into end of described calibration equipment.
Described step S3 specifically comprises following operation:
S31. described admittance type Loss of Excitation Protection calculates the admittance value of input according to the voltage and current of described calibration equipment input;
Whether the admittance value that S32. judges the input of described calibration equipment on the admittance loci of design tuning, if so, goes to step S33, otherwise returns to step S32;
S33. described admittance type Loss of Excitation Protection triggers field loss protection action and protection operating point resistance value is fed back to described calibration equipment.
Correspondingly, the present invention also provides a kind of check system of admittance type Loss of Excitation Protection, it is characterized in that, comprises calibration equipment and admittance type Loss of Excitation Protection, it is characterized in that, also comprises modular converter;
Described modular converter is for converting the admittance loci corresponding to field loss protection admittance definite value of described design tuning to locus of impedance;
Described calibration equipment arranges test parameters for the locus of impedance of changing according to described modular converter, and the output voltage of described calibration equipment and electric current and described admittance type Loss of Excitation Protection are matched;
Described admittance type Loss of Excitation Protection is calculated verification admittance for the calibration voltage and the verification galvanometer that provide according to described calibration equipment; and judge that verification admittance is whether on the admittance loci of design tuning; if, trigger protection action, otherwise not trigger protection action.
Described calibration equipment is also for recording operating point resistance value and the locus of impedance feeding back when described admittance type Loss of Excitation Protection trigger protection moves.
First described modular converter calculates the famous value of admittance according to per unit admittance, then admittance loci corresponding to the famous value of admittance is converted to locus of impedance; Admittance loci is straight line and/or ray, locus of impedance for circle and/circular arc.
The electric current of described calibration equipment output remains unchanged, and searches for working value and the movement locus of field loss protection by automatic change output voltage.
The test parameters of described calibration equipment setting comprises: spacing and the distribution range of the action radius of impedance circle, impedance central coordinate of circle and testing site.
Implement the embodiment of the present invention; there is following beneficial effect: solved manually several definite value points of verification and cannot verify the difficult problem on whole admittance definite value border of admittance type Loss of Excitation Protection; verified the whole admittance loci of admittance type Loss of Excitation Protection; guarantee field loss protection action message tripping operation after loss of exicitation, for generator and power system stability operation provide sound assurance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method for calibration process flow diagram of admittance type Loss of Excitation Protection provided by the invention;
Fig. 2 is admittance definite value track provided by the invention and impedance definite value track transformation result figure;
Fig. 3 is the check system block diagram of admittance type Loss of Excitation Protection provided by the invention;
Fig. 4 A is admittance definite value 1 test resistance value and impedance point trajectory diagram provided by the invention;
Fig. 4 B is the theoretical locus of impedance of admittance definite value 1 provided by the invention and test impedance point comparison diagram;
Fig. 5 A is admittance definite value 2 test resistance value and impedance point trajectory diagrams provided by the invention;
Fig. 5 B is the theoretical locus of impedance of admittance definite value 2 provided by the invention and test impedance point comparison diagram;
Fig. 6 A is admittance definite value 3 test resistance value and impedance point trajectory diagrams provided by the invention;
Fig. 6 B is the theoretical locus of impedance of admittance definite value 3 provided by the invention and test impedance point comparison diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, Fig. 1 is the method for calibration process flow diagram of admittance type Loss of Excitation Protection provided by the invention.As shown in Figure 1, method of calibration comprises the following steps:
S1. modular converter converts the field loss protection per unit admittance of design tuning to admittance famous value, then admittance loci corresponding to the famous value of admittance is converted to the locus of impedance in impedance plane;
S2. the locus of impedance providing according to described modular converter the test parameters of calibration equipment and test connection are set so that the automatic output voltage of described calibration equipment and electric current to admittance type Loss of Excitation Protection;
S3. described admittance type Loss of Excitation Protection is according to the voltage and current triggering field loss protection action of input and to described calibration equipment feedback action point impedance value;
S4. described calibration equipment records received operating point resistance value and in coordinate plane, generates operating point locus of impedance.
Should be understood that when not adopting technical scheme provided by the invention, directly the voltage and current of existing calibration equipment is input in existing admittance type Loss of Excitation Protection, cannot mate between the two.The method of calibration providing by the present embodiment, can realize the existing admittance type of existing calibration equipment Auto-matching Loss of Excitation Protection, thereby can utilize calibration equipment realize automatic Verification admittance type field loss protection definite value and draw definite value boundary value.
In order further to judge whether the action impedance value that calibration equipment records conforms to locus of impedance with the resistance value of design tuning with operating point track, further comprising the steps after step S4:
S5. derive the resistance value data and the operating point track that is positioned at coordinate plane of described calibration equipment record;
S6. the action impedance locus of points of described calibration equipment record is compared with the locus of impedance that described modular converter provides, to verify whether the protection working value of described admittance type Loss of Excitation Protection meets actual designing requirement.
If on the locus of impedance that the action impedance point of described calibration equipment record provides at described modular converter, the realistic designing requirement of protection working value of admittance type Loss of Excitation Protection is described.
In another preferred embodiment of the present invention, described step S1 specifically comprises following operation:
S11, according to the reference value of the per unit admittance of design tuning and described admittance type Loss of Excitation Protection, calculate the famous value of admittance, the wherein famous value=per unit admittance * reference value of admittance;
S12, according to the famous value computing impedance of admittance value, wherein resistance value is the inverse of the famous value of admittance;
S13, the admittance loci in field loss protection admittance plane is converted to the locus of impedance in impedance plane.
In another preferred embodiment of the present invention, described step S2 specifically comprises following operation:
S21, described calibration equipment enter impedance type Loss of Excitation Protection checking mode;
Should be understood that existing calibration equipment is the product of software and hardware combining, not only can test protection equipment, can also test aut.eq., carry out electric system simulation and common apparatus calibration etc.In a preferred embodiment of the invention, while utilizing existing calibration equipment to carry out automatic Verification, need be introduced into the software that calibration equipment carries, select the checking mode that impedance type Loss of Excitation Protection is carried out to verification;
S22, the locus of impedance providing according to described conversion equipment, arrange spacing and the distribution range of action radius, impedance central coordinate of circle and the testing site of impedance circle by described calibration equipment;
S23, the voltage and current output loop of described calibration equipment is connected to the voltage and current loop of described admittance type Loss of Excitation Protection so that the voltage and current of described calibration equipment output is input to described admittance type Loss of Excitation Protection;
S24, admittance type field loss protection action connection point is connected to opening into end of described calibration equipment.
Described step S24 is that the resistance value of operating point feeds back to described calibration equipment when described admittance type Loss of Excitation Protection is triggered to field loss protection action, so that described calibration equipment operation of recording point impedance value.
In another preferred embodiment of the present invention, described step S3 specifically comprises following operation:
S31. described admittance type Loss of Excitation Protection calculates the admittance value of input according to the voltage and current of described calibration equipment input;
Whether the admittance value that S32. judges the input of described calibration equipment on the admittance loci of design tuning, if so, goes to step S33, otherwise returns to step S32;
S33. described admittance type Loss of Excitation Protection triggers field loss protection action and protection operating point resistance value is fed back to described calibration equipment.
Refer to Fig. 2, Fig. 2 is admittance definite value track provided by the invention and impedance definite value track transformation result figure.Generator normally operation holds admittance in fourth quadrant opportunity, and after loss of exicitation, the admittance of machine end will enter first quartile from fourth quadrant.The definite value of admittance type field loss protection is 4 rays and 1 straight line, when the admittance of machine end enters and is just judged as generator set loss of excitation when first quartile is crossed admittance straight line from fourth quadrant in admittance plane.Because admittance loci stretches to infinite distance in admittance plane, calibration equipment cannot directly be measured its whole track.
For whether the admittance characteristic of verification field loss protection meets design requirement; 4 rays and 1 straight-line pass conversion in admittance plane can be converted to 4 sections of circular arcs (part impedance circle) and 1 impedance circle in impedance plane, can by the method for verification impedance circle characteristic, carry out easily the admittance characteristic of indirect verification field loss protection like this.According to plural transformation rule, we know, the step that the point in z-plane (x, y) is converted to the point (u, v) in w plane is:
If the point in z-plane is: z=x+jy, the point in w plane: w=u+jv, and meet
Point in z-plane meets straight-line equation: y=kx+b, and k, b are constant, b ≠ 0;
By conversion, we are converted to the circle in w plane by the straight line in z-plane (equation y=kx+b)
in z-plane, on a beeline y=kx+b, any point can be in w plane inner circle
on find corresponding point, and this conversion is one to one.
Preferably, certain 1000MW generator loss-of-excitation protection definite value (perunit value) of newly building a power station:
Admittance 1:Y1=0.51, Angle1=80 °, t1=10s (2 about vertical axisymmetric ray);
Admittance 2:Y2=0.46, Angle2=90 °, the t2=1.0s straight line of the longitudinal axis (1 perpendicular to);
Admittance 3:Y3=1.1, Angle3=100 °, t3=0s (2 about vertical axisymmetric ray);
The transformational relation that utilizes point in above-mentioned two planes, can be converted to admittance definite value impedance definite value (two sub-values):
Impedance circle 1:(u ± 1.97 of admittance 1 correspondence)
2+ (v+11.32)
2=132.12;
The impedance circle 2:u of admittance 2 correspondences
2+ (v+12.55)
2=157.31;
Impedance circle 3:(u ± 0.93 of admittance 3 correspondences)
2+ (v+5.25)
2=28.41;
Wherein, Y1, Y2 and Y3 represent respectively the effective value of three per unit admittances, and u and v represent respectively real number and the imaginary number coordinate of impedance plane internal impedance two sub-values.As shown in Figure 2, ray 1 and 2 corresponding admittance definite values 1, the corresponding admittance definite value 2 of straight line 3, ray 4 and 5 corresponding admittance definite values 3 in Fig. 2.Be transformed into after impedance plane the ray 1 and 2 in the circular arc 1 in Fig. 2 and 2 corresponding admittance planes, the straight line 3 in circle 3 corresponding admittance planes, the ray 4 and 5 in circular arc 4 and 5 corresponding admittance planes.
Refer to Fig. 3, Fig. 3 is the check system block diagram of admittance type Loss of Excitation Protection provided by the invention.The check system of the Loss of Excitation Protection of admittance type as shown in Figure 3, comprises modular converter 100, calibration equipment 200 and admittance type Loss of Excitation Protection 300.
Described modular converter 100 converts the admittance definite value track of the generator loss-of-excitation protection of described design tuning (being per unit admittance track) to locus of impedance (being the famous value track of impedance).Wherein, first described modular converter 100 calculates the famous value of admittance according to per unit admittance, the more famous value track of admittance is converted to the famous value track of impedance.
Described calibration equipment 200 is changed according to described modular converter 100 locus of impedance coming test parameters is set, and the output voltage of described calibration equipment and electric current and described admittance type Loss of Excitation Protection are matched.Set test parameters comprises: spacing and the distribution range of the action radius of impedance circle, impedance central coordinate of circle and testing site.
Calibration voltage and verification galvanometer that described admittance type Loss of Excitation Protection 300 provides according to described calibration equipment 200 are calculated verification admittance; and judge that verification admittance is whether on the admittance loci of design tuning; if, trigger protection action, otherwise not trigger protection action.After trigger protection action, calibration voltage when described admittance type Loss of Excitation Protection 300 moves trigger protection and verification current feedback are given described calibration equipment 200.Resistance value when described calibration equipment 200 calculates trigger protection action according to the voltage and current value feeding back, and operation of recording resistance value and the action impedance locus of points.
Preferably, described calibration equipment 200 is when from admittance type field loss protection system 300 output verification voltages described in trend and verification electric current, and the electric current of output remains unchanged, and searches for working value and the movement locus of field loss protection by automatic change output voltage.
Preferably; in another embodiment provided by the invention; described calibration equipment 200 feeds back to described modular converter 100 by recorded action impedance value and impedance point track; whether the described modular converter action impedance point that automatically more described calibration equipment 200 provides is on the locus of impedance being converted to according to the admittance loci of design tuning; if, output admittance type Loss of Excitation Protection protection action meets the signal of designing requirement; if have part operating point not on locus of impedance, export and report an error signal and export the resistance value while reporting an error.
Should be understood that described modular converter 100 can be to be built in chip in existing calibration equipment 200 or this is software program, or the combination of hardware and software program.Certainly; the most extreme in the situation that; also can utilize other software (comprising office software) to realize the conversion between admittance loci and locus of impedance; then artificial parameter and the wiring that regulates described correction verification module, manually mates described calibration equipment 100 and described admittance type Loss of Excitation Protection 300.
Please refer to Fig. 4 A, Fig. 4 A is admittance definite value 1 test resistance value and impedance point trajectory diagram provided by the invention.Admittance definite value 1 counterpart impedance circle 1: the center of circle (± 1.97,-11.32), radius 11.49 (theory locus), Fig. 4 A is original experiment data and the trip boundary of admittance definite value 1 correspondence that records of calibration equipment (in the present embodiment preferably rich electric relay protection instrument).The actual measurement action impedance value of rich electric relay protection instrument record is plotted in theoretical locus of impedance, obtains the theoretical locus of impedance of admittance definite value 1 and test impedance point comparison diagram as shown in Figure 4 B.As shown in Figure 4 B, the circular arc in figure is the impedance theory track of admittance definite value 1 correspondence, and point in figure is actual measurement action impedance point.From Fig. 4 B, can find out, except putting 4,9,11 slightly deviation theory track, all the other 9 operating points are all on theory locus.
Please refer to Fig. 5 A, Fig. 5 A is admittance definite value 2 test resistance value and impedance point trajectory diagrams provided by the invention.Admittance definite value 2 counterpart impedance circles 2: the center of circle (0 ,-12.55), radius 12.55 (theory locus), Fig. 5 A is original experiment data and the trip boundary of admittance definite value 2 correspondences that record of rich electric relay protection instrument.The actual measurement action impedance value of rich electric relay protection instrument record is plotted in theoretical locus of impedance, obtains the theoretical locus of impedance of admittance definite value 2 and test impedance point comparison diagram as shown in Figure 5 B.As described in Fig. 5 B, the circle in figure is the impedance theory track of admittance definite value 2 correspondences, and point in figure is actual measurement action impedance point.From Fig. 5 B, can find out, all 12 operating points are all on theory locus.
Please refer to Fig. 6 A, Fig. 6 A is admittance definite value 3 test resistance value and impedance point trajectory diagrams provided by the invention; Admittance definite value 3 counterpart impedance circles 3: the center of circle (± 0.93 ,-5.25), radius 5.33 (theory locus), Fig. 6 A is original experiment data and the trip boundary of admittance definite value 3 correspondences that record of rich electric relay protection instrument.The actual measurement action impedance value of rich electric relay protection instrument record is plotted in theoretical locus of impedance, obtains the theoretical locus of impedance of admittance definite value 3 and test impedance point comparison diagram as shown in Figure 6B.As described in Fig. 6 B, the circle in figure is the impedance theory track of admittance definite value 3 correspondences, and point in figure is actual measurement action impedance point.From Fig. 6 B, can find out, except putting 11,12 slightly deviation theory track, all the other 10 operating points are all on theory locus.
The test result providing from above-described embodiment and comparison diagram can be found out; method of calibration provided by the invention and system can very accurately be verified movement locus and the trip boundary of admittance type Loss of Excitation Protection; all checking procedures are all that rich electric relay protection instrument completes automatically; not only improved verification efficiency; also strengthen the reliability of verification, can guarantee effectively the stable power-supplying of electricity generation system.In order more to clearly state automatic check function of the present invention, below by provide prior art to the calibration tails of admittance type field loss protection system to compare.
Preferably; the Nanjing technician of Siemens Company still adopts the field loss protection of manual verification admittance type at present; this method of calibration can only manually verification definite value several operating points, cannot verify whole admittance loci, moreover whether operating point is not verified on admittance loci at all.
Up to the present, also do not have better method of calibration can substitute the whole admittance loci of the method for calibration checking admittance type field loss protection in this programme.
Below field loss protection definite value and producer's calibration tails of certain 1000MW unit in power station:
■ definite value
| Title | Electronic | Angle | Mode | Time |
| Characteristic 1 | 0.42 | 80° | T1 subtracts and exerts oneself | 10s |
| Characteristic 2 | 0.38 | 90° | T2 tripping operation | 10s |
| Characteristic 3 | 1.02 | 100° | T3 tripping operation | 0.5s |
■ A cabinet test figure
Characteristic 1
| Voltage (V) | 57.74 | 57.74 | 57.74 |
| Electric current (A) | 2.695 | 2.385 | 2.28 |
| Φ＝u-1(°) | 40 | 50 | 55 |
| Time (s) | 10.03 | 10.01 | 10.02 |
Characteristic 2
| Voltage (V) | 57.74 | 57.74 | 57.74 |
| Electric current (A) | 1.977 | 1.939 | 1.917 |
| Φ＝u-1(°) | 75 | 80 | 85 |
| Time (s) | 10.3 | 10.8 | 10.7 |
Characteristic 3
| Voltage (V) | 57.74 | 57.74 | 57.74 |
| Electric current (A) | 6.527 | 5.774 | 5.321 |
| Φ＝u-1(°) | 60 | 70 | 80 |
| Time (s) | 10.2 | 10.3 | 10.6 |
From above-mentioned calibration tails, can find out, the method for calibration of existing admittance type Loss of Excitation Protection can only, by the several points of manual verification, can not utilize calibration equipment to realize automatic Verification.Manually several points of verification can not intuitively react whole movement locus and the trip boundary of admittance type Loss of Excitation Protection, and verification efficiency is low, poor reliability.And method of calibration provided by the invention takes full advantage of existing calibration equipment, by a modular converter, the existing calibration equipment that is applicable to impedance type field loss protection system is successfully applied in the automatic Verification of admittance type Loss of Excitation Protection.Method of calibration provided by the invention has obviously improved verification efficiency and verification reliability, thereby in the time of guaranteeing loss of exicitation effectively, protective device real-time action, by loss of excitation generator off-the-line, is guaranteed electricity generation system stable operation.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and the equivalent variations of doing according to the claims in the present invention, still belong to the scope that invention is contained.
Claims (10)
1. a method of calibration for admittance type Loss of Excitation Protection, is characterized in that, comprises the following steps:
S1. modular converter converts the field loss protection per unit admittance of design tuning to admittance famous value, then admittance loci corresponding to the famous value of admittance is converted to the locus of impedance in impedance plane;
S2. the locus of impedance providing according to described modular converter the test parameters of calibration equipment and test connection are set so that the automatic output voltage of described calibration equipment and electric current to admittance type Loss of Excitation Protection;
S3. described admittance type Loss of Excitation Protection is according to the voltage and current triggering field loss protection action of input and to described calibration equipment feedback action point impedance value;
S4. described calibration equipment records received operating point resistance value and in coordinate plane, generates operating point locus of impedance.
2. method of calibration according to claim 1, is characterized in that, further comprising the steps of after described step S4:
S5. derive the resistance value data and the operating point track that is positioned at coordinate plane of described calibration equipment record;
S6. the action impedance locus of points of described calibration equipment record is compared with the locus of impedance that described modular converter provides, to verify whether the protection working value of described admittance type Loss of Excitation Protection meets actual designing requirement.
3. method of calibration according to claim 1, is characterized in that, described step S1 specifically comprises following operation:
S11, according to the reference value of the per unit admittance of design tuning and described admittance type Loss of Excitation Protection, calculate the famous value of admittance, the wherein famous value=per unit admittance * reference value of admittance;
S12, according to the famous value computing impedance of admittance value, wherein resistance value is the inverse of the famous value of admittance;
S13, the admittance loci in field loss protection admittance plane is converted to the locus of impedance in impedance plane.
4. method of calibration according to claim 1, is characterized in that, described step S2 specifically comprises following operation:
S21, described calibration equipment enter impedance type Loss of Excitation Protection checking mode;
S22, the locus of impedance providing according to described conversion equipment, arrange spacing and the distribution range of action radius, impedance central coordinate of circle and the testing site of impedance circle by described calibration equipment;
S23, the voltage and current output loop of described calibration equipment is connected to the voltage and current loop of described admittance type Loss of Excitation Protection so that the voltage and current of described calibration equipment output is input to described admittance type Loss of Excitation Protection;
S24, admittance type field loss protection action connection point is connected to opening into end of described calibration equipment.
5. method of calibration according to claim 1, is characterized in that, described step S3 specifically comprises following operation:
S31. described admittance type Loss of Excitation Protection calculates the admittance value of input according to the voltage and current of described calibration equipment input;
Whether the admittance value that S32. judges the input of described calibration equipment on the admittance loci of design tuning, if so, goes to step S33, otherwise returns to step S32;
S33. described admittance type Loss of Excitation Protection triggers field loss protection action and protection operating point resistance value is fed back to described calibration equipment.
6. a check system for admittance type Loss of Excitation Protection, comprises calibration equipment and admittance type Loss of Excitation Protection, it is characterized in that, also comprises modular converter;
Described modular converter is for converting the admittance loci corresponding to field loss protection admittance definite value of described design tuning to locus of impedance;
Described calibration equipment arranges test parameters for the locus of impedance of changing according to described modular converter, and the output voltage of described calibration equipment and electric current and described admittance type Loss of Excitation Protection are matched;
Described admittance type Loss of Excitation Protection is calculated verification admittance for the calibration voltage and the verification galvanometer that provide according to described calibration equipment; and judge that verification admittance is whether on the admittance loci of design tuning; if, trigger protection action, otherwise not trigger protection action.
7. check system according to claim 6, is characterized in that, operating point resistance value and locus of impedance that described calibration equipment also feeds back when recording described admittance type Loss of Excitation Protection trigger protection action.
8. check system according to claim 6, is characterized in that, first described modular converter calculates the famous value of admittance according to per unit admittance, then admittance loci corresponding to the famous value of admittance is converted to locus of impedance; Admittance loci is straight line and/or ray, locus of impedance for circle and/circular arc.
9. check system according to claim 6, is characterized in that, the electric current of described calibration equipment output remains unchanged, and searches for working value and the movement locus of field loss protection by automatic change output voltage.
10. check system according to claim 6, is characterized in that, the test parameters of described calibration equipment setting comprises: spacing and the distribution range of the action radius of impedance circle, impedance central coordinate of circle and testing site.
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|---|---|---|---|
| CN201410253296.8A CN104035030A (en) | 2014-06-09 | 2014-06-09 | Calibration method and system of admittance type excitation loss protection device |
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