CN107436415B - Working method of online testing system for distributed power grid-connected inverter and capacitor - Google Patents
Working method of online testing system for distributed power grid-connected inverter and capacitor Download PDFInfo
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- CN107436415B CN107436415B CN201710794762.7A CN201710794762A CN107436415B CN 107436415 B CN107436415 B CN 107436415B CN 201710794762 A CN201710794762 A CN 201710794762A CN 107436415 B CN107436415 B CN 107436415B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The invention relates to a working method of an online testing system of a distributed power grid-connected inverter and a capacitor, wherein the online testing system comprises the following steps:Hbridge inverter, theHThe bridge inverter is controlled by a control unit; the working method of the online test system comprises the following steps: the control unit establishes theHInput and output voltage databases of bridge inverters by collectingHInput and output voltages of bridge inverter and the same in databaseHComparing the input and output voltages of the bridge inverter to determineHWhether the bridge inverter is broken.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a working method of a distributed power grid-connected inverter and a working method of an online testing system of a capacitor.
Background
With the original more distributed power generation systems connected to the power grid, power grid companies of various countries all put forward new strict requirements on the distributed power generation systems, namely, the distributed power generation systems are required to continue grid-connected operation and generate active power or reactive power to support the power grid when the power grid fails. Therefore, the distributed power generation system needs to be tested for the adaptability of the power grid before grid connection, however, various forms of power grid faults are not common because the goal of the power grid is to provide standard three-phase sinusoidal voltage. Therefore, when testing a distributed power generation system, it is difficult to reproduce a fault situation only through the grid, and a special device or instrument is required to simulate the fault situation.
Disclosure of Invention
The invention aims to provide a working method of a distributed power supply grid-connected inverter and a working method of an online testing system of a capacitor, and solves the problem of the online testing system of the distributed power supply grid-connected inverter and the capacitorHThe bridge inverter carries out on-line detection.
In order to solve the technical problem, the invention provides a working method of an online test system of a distributed power grid-connected inverter and a capacitor, wherein the online test system comprises:Hbridge inverter, theHThe bridge inverter is controlled by a control unit; the working method of the online test system comprises the following steps: the control unit establishes theHInput and output voltage databases of bridge inverters by collectingHInput and output voltages of bridge inverter and the same in databaseHComparing the input and output voltages of the bridge inverter to determineHWhether the bridge inverter is broken.
Further, the online test system further comprises: the capacitance testing unit is used for carrying out capacitance online detection, and the working method of the capacitance testing unit comprises the following steps:
the method comprises the following steps: collecting voltage vectors at two ends of the capacitor to be measured, and decomposing the voltage vectors into fundamental wave voltage
Andnsub-harmonic voltage component
I.e. the superimposed voltage across the capacitor under test
I.e. by
Calculating the effective value of the superimposed voltageUEffective value of fundamental voltageU 0。
Step two: establishing a capacitance sound pressure level database, wherein the database comprises: each type of capacitor has a capacitor sound pressure level corresponding to the effective value of each fundamental voltage.
Presetting the type and rated capacitance of the capacitor to be measuredC 0According to the type of the measured capacitor and the current effective value of the fundamental voltageU 0Obtaining a corresponding capacitance sound pressure level from the database of capacitance sound pressure levels
。
Collecting sound signals generated by the tested capacitor to obtain the corresponding capacitor sound pressure level
By the formula
Calculating the actual capacitance of the measured capacitorC x 。
Step three: according to the actual capacitance of the measured capacitorC x And effective value of the superimposed voltageUEstablishing a capacitance estimation equation, i.e.
(ii) a Wherein the content of the first and second substances,Cthe ultimate capacitance value when the tested capacitor is damaged,tin order to allow the capacitor to be damaged for the expected time,kis the effective value of the measured capacitance at the current fundamental voltage in unit timeU 0The lower corresponding coefficient of change in capacitance, i.e.,
wherein, in the step (A),C x1andC x2the initial value and the final value of the capacitance of the measured capacitor in unit time are shown.
Setting the limit capacitance valueCAnd deducing the expected time of capacitor damage through the capacitance estimation formulatIs calculated by the formula (i)
So as to calculate the expected time of the tested capacitor being damaged.
Further, the effective value of the superimposed voltageUBy a fundamental voltage
Andnsub-harmonic voltage component
The square root value of the sum of the squares of the effective values of (a) is obtained.
Further, thenSub-harmonic voltage component
InnAnd 5, taking.
Compared with the prior art, the technical scheme of the invention has the following advantages: (1) the invention establishes the above through the control unitHInput and output voltage databases of bridge inverters by collectingHInput and output voltages of bridge inverter and the same in databaseHComparing the input and output voltages of the bridge inverter to determineHWhether the bridge inverter is damaged or not, the method has the advantages of real-time simplicity and good reliability; (2) the invention combines the ultrasonic sensor and the high-frequency current sensor, and realizes the on-line detection without turning off the power supply; (3) the invention collects the capacitance sound pressure level generated by the capacitance to be measured through the ultrasonic sensor
(ii) a The high-frequency current sensor collects the voltage values at two ends of the capacitor, a capacitance estimation formula is established, the life of the capacitor to be measured is predicted by using the formula, and compared with the traditional method of only detecting the actual capacitance of the current capacitor to judge the life of the capacitor, the method has the advantage of forward lookingAnd (4) sex.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments taken in conjunction with the accompanying drawings, in which
FIG. 1 is a block diagram of the online test system;
FIG. 2 is a schematic block diagram of the capacitance test unit;
fig. 3 is a flowchart of a working method of the capacitance testing unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
As shown in fig. 1, a working method of an online test system for a distributed power grid-connected inverter and a capacitor, wherein the online test system includes:Hbridge inverter, theHThe bridge inverter is controlled by a control unit; the working method of the online test system comprises the following steps: the control unit establishes theHInput and output voltage databases of bridge inverters by collectingHInput and output voltages of bridge inverter and the same in databaseHComparing the input and output voltages of the bridge inverter to determineHWhether the bridge inverter is broken.
Through the inventionIGBTThree-phase construction by switching technologyHBridge inverter, control unit pairHSolutions for the corresponding control of the bridge have been disclosed in a large number of documents, for example:ＥＭＳthe energy management system can achieve the control function.
The control unit establishes theHThe steps of the input and output voltage database of the bridge inverter include: by for each typeHBridge inverter outputSampling the input and output voltages to obtain standard values, i.e. establishing the input and output voltage database, when the control unit detects that the tested voltage is detectedHJudging that the output voltage of the bridge inverter is not consistent with the output voltage in the database under the current input voltageHThe bridge inverter fails.
The input and output voltages are collected and can be transmitted through a step-down transformer,ADThe module and the processor unit belong to the prior art.
Example 2
As shown in fig. 2, the online test system according to embodiment 1 further includes: a capacitance test unit for performing on-line detection of capacitance, the capacitance test unit comprising:
the ultrasonic sensor is used for collecting sound signals generated by the measured capacitor to obtain the corresponding capacitor sound pressure level
。
And the high-frequency current sensor is used for acquiring voltage vectors at two ends of the capacitor.
The ultrasonic sensor and the high-frequency current sensor are respectively connected with the data processing control unit through the corresponding data conditioning unit; namely, the ultrasonic sensor and the high-frequency current sensor are respectively connected with the numerical control processing control unit through the first data conditioning unit and the second data conditioning unit, and the first data conditioning unit and the second data conditioning unit can adopt amplifiers with a certain proportion formed by integrated operational amplifiers.
The data processing control subunit includes:
a capacitance superposition voltage calculation module suitable for decomposing the obtained voltage vector into fundamental voltage
Andnsub-harmonic voltage component
I.e. the superimposed voltage across the capacitor under test
I.e. by
Calculating the effective value of the superimposed voltageUWhile calculating the effective value of the fundamental voltageU 0(ii) a Wherein the method for obtaining harmonic wave and fundamental wave is realized byFFTThe calculation results, and the method has been described in a large number of documents in the prior art, such as: li Jia liter and Chaihejie, 9 months 2009, have been described in the paper "research on-line fast detection method of harmonic between harmonic waves of electric energy quality" in the journal "protection and control of electric power system".
A capacitance calculating module suitable for calculating the rated capacitance according to the preset type of the capacitor to be measuredC 0And obtaining the capacitance sound pressure level of the measured capacitance corresponding to the effective value of each fundamental voltage through the capacitance sound pressure level database
(ii) a Obtaining the corresponding capacitance sound pressure level by the sound signal generated by the measured capacitance
By the formula
Calculating the actual capacitance of the measured capacitorC x (ii) a Wherein the capacitance sound pressure level
The method comprises the steps that the method is obtained by establishing a capacitor sound pressure level database, namely, capacitor sound pressure levels corresponding to various types of capacitors and effective values of various fundamental wave voltages are stored in the database, and capacitor sound pressure level data corresponding to the capacitors are searched and obtained from the capacitor sound pressure level database through presetting the types of the input capacitors to be detected and calculating the obtained effective values of the current fundamental wave voltages; calculating corresponding capacitance sound pressure level
In the paper literature: a capacitance noise level calculation method based on a vibration signal, published in the journal of the electronics and technology in 2010 at 6 months, is disclosed.
The module for calculating the life of the measured capacitor is suitable for calculating the actual capacitance of the measured capacitorC x And effective value of the superimposed voltageUEstablishing a capacitance estimation equation, i.e.
(ii) a Wherein the content of the first and second substances,Cthe ultimate capacitance value when the tested capacitor is damaged,tin order to allow the capacitor to be damaged for the expected time,kis the effective value of the measured capacitance at the current fundamental voltage in unit timeU 0The lower corresponding coefficient of change in capacitance, i.e.,
whereinC x1AndC x2is at the effective value of the current fundamental voltageU 0The initial value and the final value of the capacitance of the capacitor to be measured in unit time; coefficient of variation of capacitancekThe capacitance change coefficient database can be obtained by actually measuring and establishing capacitance change coefficient databases of various types of capacitors under effective values of various fundamental wave voltages, and the capacitance change coefficient database is searched to obtain the capacitance change coefficient corresponding to the capacitor according to the type of the capacitor and the effective value of the corresponding fundamental wave voltagekThe specific acquisition method comprises the following steps: the initial and final capacitance values of each type of capacitance measured under the effective values of various fundamental wave voltages in a period of time are converted to corresponding initial and final capacitance values in a unit time, and the effective value of the current fundamental wave voltage is obtained by calculation according to the type of the preset capacitance to be measured and the capacitance variation coefficient corresponding to the capacitance is searched from the capacitance variation coefficient databasekFor convenience of calculation, the variation of the capacitance in unit time is linear; and deducing the expected time of capacitor damage through the capacitance estimation formulatIs calculated by the formula (i)
Setting the limit capacitance valueCSo as to calculate the expected time of the tested capacitor being damaged.
The superimposed voltage
Effective value ofUThe calculation method comprises the following steps: fundamental voltage
Andnsub-harmonic voltage component
The square root of the sum of the squares of the effective values of (a). The above-mentionednSub-harmonic voltage component
InnAnd 5, taking.
The data processing control subunit passesFPGAThe modules are implemented as a single module, i.e.,FPGAchip and method for manufacturing the sameXC6SLX9-TQG144。
Table 1 shows the comparison result between experimental data and actual measurement, and the power capacitor in Table 1 is a Juhua power capacitorBSMJ-0.415-15-3 15KvarSetting the limit capacitance valueCIs 40 percent of the original capacity.
TABLE 1 comparison table of experimental data and actual measurement
Wherein the capacitance variation coefficient is calculatedkAt 525 hours, the unit time is 24 hoursVThe capacitance variation of one day is actually measured to be 0.08 under the effective value of fundamental waveuF。
Table 2 shows the comparison result between the experimental data and the actual measurement, and the Shanghai Weiscon power capacitor is selected for the power capacitor in Table 2BSMJ0.4-15-3 and capacitanceBSMJ0.45-15-3, and setting the limit capacitance valueCIs 40 percent of the original capacity.
TABLE 2 comparison table of experimental data and actual measurement
Wherein the capacitance variation coefficient is calculatedkThe unit time is 24 hours, namely at 450VThe capacitance variation of one day is actually measured to be 0.12 under the effective value of fundamental waveuF(ii) a Or at 415VThe capacitance variation of one day is actually measured to be 0.11 under the effective value of fundamental waveuF。
Table 3 shows the comparison result between the experimental data and the actual measurement, and the power capacitor in Table 3 is a parallel power capacitor with a Deleisi self-healing low-voltage capacitorBSMJS0.4 20-3 BSMJSetting the limit capacitance valueCIs 40 percent of the original capacity.
TABLE 3 comparison table of experimental data and actual measurement
Wherein the capacitance variation coefficient is calculatedkTime unit is 24 hours, i.e. at 380VThe capacitance variation of one day is actually measured to be 0.063 under the effective value of fundamental waveuF。
The effective value of the fundamental wave in the present invention can be considered as an effective value of the voltage in an ideal state.
As can be seen from tables 1 to 3, the on-line detection and estimation of the residual time of the capacitor is practical and effective, has the characteristic of high accuracy, and can be used for estimating the limit capacitance value when the actual capacitance of the capacitor is close to the actual capacitance of the capacitor and the capacitor is damagedCThe closer the settled result is to the actual measurement result. Therefore, the online test system can complete necessary online detection of the capacitor, the detection data of the online test system is very close to the actual data, and the online test system can be completely used for estimating the service life of the capacitor.
Example 3
As shown in fig. 3, on the basis of embodiment 2, an operating method of the online test system is provided, where the online test system further includes: the capacitance testing unit is used for carrying out capacitance online detection, and the working method of the capacitance testing unit comprises the following steps:
step (ii) ofSAnd 100, obtaining effective values of superposed voltage and fundamental voltage at two ends of the capacitor to be measured.
Collecting voltage vectors at two ends of the capacitor to be measured, and decomposing the voltage vectors into fundamental wave voltage
Andnsub-harmonic voltage component
I.e. the superimposed voltage across the capacitor under test
I.e. by
Calculating the effective value of the superimposed voltageUWhile calculating the effective value of the fundamental voltageU 0(ii) a Wherein the method for obtaining harmonic wave and fundamental wave is realized byFFTThe calculation results, and the method has been described in a large number of documents in the prior art, such as: li Jia liter and Chaihejie, 9 months 2009, have been described in the paper "research on-line fast detection method of harmonic between harmonic waves of electric energy quality" in the journal "protection and control of electric power system". The capacitor in the invention is a power capacitor.
Step (ii) ofSAnd 200, obtaining the actual capacitance of the measured capacitor.
Establishing a capacitance sound pressure level database, wherein the database comprises: each type of capacitor has a capacitor sound pressure level corresponding to the effective value of each fundamental voltage.
Presetting the type and rated capacitance of the capacitor to be measuredC 0Obtaining the effective value of the measured capacitor at the current fundamental voltage through the capacitor sound pressure level databaseU 0Lower corresponding capacitance sound pressure level
(ii) a By collecting the capacitance to be measuredSound signal to obtain corresponding capacitance sound pressure level
By the formula
Calculating the actual capacitance of the measured capacitorC x (ii) a Wherein the capacitance sound pressure level
The method comprises the steps that the method is obtained by establishing a capacitor sound pressure level database, namely, capacitor sound pressure levels of various types of capacitors corresponding to effective values of fundamental wave voltages are stored in the database, and capacitor sound pressure level data corresponding to the capacitors are searched and obtained from the capacitor sound pressure level database through presetting the types of the input capacitors to be detected and calculating the obtained effective values of the current fundamental wave voltages; wherein only each fundamental voltage refers to a non-harmonic voltage; calculating corresponding capacitance sound pressure level
In the paper literature: a capacitance noise level calculation method based on a vibration signal, published in the journal of the electronics and technology in 2010 at 6 months, is disclosed.
Step (ii) ofS300, calculating the expected time of the damage of the capacitor to be measured by establishing a capacitance estimation formula.
Step (ii) ofS310, establishing a capacitance estimation formula and a capacitance variation coefficientkAnd (4) calculating a formula.
According to the actual capacitance of the measured capacitorC x And effective value of the superimposed voltageUEstablishing a capacitance estimation equation, i.e.
(ii) a Wherein the content of the first and second substances,Cthe ultimate capacitance value when the tested capacitor is damaged,tin order to allow the capacitor to be damaged for the expected time,kis the effective value of the measured capacitance at the current fundamental voltage in unit timeU 0The lower corresponding coefficient of change in capacitance,that is to say that the first and second electrodes,
，C x1andC x2is at the effective value of the current fundamental voltageU 0The initial value and the final value of the capacitance of the capacitor to be measured in unit time; coefficient of variation of capacitancekThe capacitance change coefficient database is obtained by actually measuring effective values of various types of capacitors and only various fundamental wave voltages and searching the capacitance change coefficient database according to the type of the capacitor and the effective value of the corresponding fundamental wave voltage to obtain the capacitance change coefficient corresponding to the capacitorkThe specific acquisition method comprises the following steps: the initial and final capacitance values of each type of capacitance measured under the effective values of various fundamental wave voltages in a period of time are converted to corresponding initial and final capacitance values in a unit time, and the effective value of the current fundamental wave voltage is obtained by calculation according to the type of the preset capacitance to be measured and the capacitance variation coefficient corresponding to the capacitance is searched from the capacitance variation coefficient databasekFor convenience of calculation, it is assumed that the change amount of the capacitance per unit time is linear.
Step (ii) ofSAnd 320, calculating the expected time of the damage of the measured capacitor.
Deducing the expected time of capacitor damage through the capacitance estimation formulatIs calculated by the formula (i)
Setting the limit capacitance valueCCalculating the expected time of the damage of the measured capacitor, namely the service life of the measured capacitor; wherein the ultimate capacitance valueCThe threshold value for warning the capacitance is set manually, so that the capacitance can be evaluated on line conveniently.
Further, the effective value of the superimposed voltageUBy a fundamental voltage
Andnsub-harmonic voltage component
The square root value of the sum of the squares of the effective values of (a) is obtained.
Further, in consideration of harmonic energy distribution, thenSub-harmonic voltage component
InnAnd 5, taking.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (1)
1. The utility model provides an online test system of distributed generator grid-connected inverter and electric capacity which characterized in that, online test system includes:Hbridge inverter, theHThe bridge inverter is controlled by a control unit;
the working method of the online test system comprises the following steps: the control unit establishes theHInput and output voltage databases of bridge inverters by collectingHInput and output voltages of bridge inverter and the same in databaseHComparing the input and output voltages of the bridge inverter to determineHWhether the bridge inverter is damaged;
the control unit establishes theHThe steps of the input and output voltage database of the bridge inverter include: by for each typeHSampling the input and output voltages of the bridge inverter to obtain standard values, namely establishing an input and output voltage database, and when the control unit detects that the measured voltage is detectedHJudging that the output voltage of the bridge inverter is not consistent with the output voltage in the database under the current input voltageHA bridge inverter fault;
the working method of the online test system further comprises the following steps: the capacitance testing unit is used for carrying out capacitance online detection, and the working method of the capacitance testing unit comprises the following steps:
the method comprises the following steps: collecting voltage vectors at two ends of the capacitor to be measured, and decomposing the voltage vectors into fundamental wave voltage
Andnsub-harmonic voltage component
So as to obtain the superposed voltage of two ends of the measured capacitor
I.e. by
Then calculating the effective value of the superimposed voltageUEffective value of fundamental voltageU 0；
Step two: establishing a capacitance sound pressure level database, wherein the database comprises: the sound pressure level of each type of capacitor corresponding to the effective value of each fundamental voltage;
presetting the type and rated capacitance of the capacitor to be measuredC 0According to the type of the measured capacitor and the current effective value of the fundamental voltageU 0Obtaining a corresponding capacitance sound pressure level from the database of capacitance sound pressure levels
；
Collecting sound signals generated by the tested capacitor to obtain the corresponding capacitor sound pressure level
By the formula
Calculating the actual capacitance of the measured capacitorC x ；
Step three: according to the actual capacitance of the measured capacitorC x And effective value of the superimposed voltageUEstablishing a capacitance estimation equation, i.e.
(ii) a Wherein the content of the first and second substances,Cthe ultimate capacitance value when the tested capacitor is damaged,tin order to allow the capacitor to be damaged for the expected time,kis the effective value of the measured capacitance at the current fundamental voltage in unit timeU 0The lower corresponding coefficient of change in capacitance, i.e.,
wherein, in the step (A),C x1andC x2the initial value and the final value of the capacitance of the measured capacitor in unit time are shown;
setting the limit capacitance valueCAnd deducing the expected time of capacitor damage through the capacitance estimation formulatIs calculated by the formula (i)
To calculate the expected time of the damage of the tested capacitor;
effective value of the superimposed voltageUBy a fundamental voltage
Andnsub-harmonic voltage component
Obtaining a square root value of the sum of squares of the effective values;
the above-mentionednSub-harmonic voltage component
InnTaking 5;
a data processing control subunit passesFPGAAnd the module is implemented.
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| CN201410256883 | 2014-06-11 | ||
| CN2014102568832 | 2014-06-11 | ||
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| CN201710794720.3A Expired - Fee Related CN107589324B (en) | 2014-06-11 | 2014-09-18 | Online testing system for grid-connected inverter and capacitor |
| CN201710819231.9A Active CN107621582B (en) | 2014-06-11 | 2014-09-18 | Online testing system for grid-connected inverter and capacitor and working method thereof |
| CN201710794765.0A Active CN107561410B (en) | 2014-06-11 | 2014-09-18 | Online testing system for distributed power supply grid-connected inverter and capacitor |
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| CN201710794720.3A Expired - Fee Related CN107589324B (en) | 2014-06-11 | 2014-09-18 | Online testing system for grid-connected inverter and capacitor |
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| CN105203865B (en) * | 2014-06-11 | 2017-10-27 | 国电联合动力技术有限公司 | The method of work of the Online Transaction Processing of distributed electrical source grid-connected inverter and electric capacity |
| CN109596875B (en) * | 2018-12-04 | 2023-08-18 | 国网湖北省电力有限公司电力科学研究院 | Method and device for detecting waveform abnormality of output voltage of H-bridge power unit |
| CN109596894A (en) * | 2019-01-02 | 2019-04-09 | 厦门科华恒盛股份有限公司 | Ac capacitor on-line monitoring method and device |
| CN112564287A (en) * | 2020-12-12 | 2021-03-26 | 国网新源控股有限公司回龙分公司 | Simple system for monitoring running state of power equipment |
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| Publication number | Publication date |
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| CN107436415A (en) | 2017-12-05 |
| CN107561410B (en) | 2021-04-27 |
| CN107621582B (en) | 2019-12-24 |
| CN107589324A (en) | 2018-01-16 |
| CN105203865B (en) | 2017-10-27 |
| CN105203865A (en) | 2015-12-30 |
| CN107589324B (en) | 2019-12-27 |
| CN107621582A (en) | 2018-01-23 |
| CN107561410A (en) | 2018-01-09 |
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