CN102621457B - On-line detection method of metal oxide arrester insulating property influencing factor - Google Patents
On-line detection method of metal oxide arrester insulating property influencing factor Download PDFInfo
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- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 91
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 91
- 238000001514 detection method Methods 0.000 title abstract description 4
- 230000032683 aging Effects 0.000 claims abstract description 20
- 238000007405 data analysis Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 15
- 238000004458 analytical method Methods 0.000 claims description 10
- 230000007812 deficiency Effects 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 4
- 206010063493 Premature ageing Diseases 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 description 8
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- 101100042630 Caenorhabditis elegans sin-3 gene Proteins 0.000 description 2
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Abstract
The invention discloses an on-line detection method of a metal oxide arrester insulating property influencing factor. The on-line detection method comprises the following steps of: firstly obtaining total current i x (t) of leakage current from a metal oxide arrester ground downlead, and separating resistive current i r (t) from the total current; calculating a total current amplitude value I x, a resistive current amplitude value I r, fundamental current amplitude value I r 1 in the resistive current and a triple-frequency harmonics electric current amplitude value I r3 in the resistive current; and further calculating an aging coefficient beta of a metal oxide arrester, if the I x is greater than a setting value or the I r is greater than the setting value, judging the insulating property of the metal oxide arrester to be poor, and then forming criteria according to the I r, the I r 1, the I r 3 and beta. The method can exactly distinguish the influencing factor which causes the insulating property of the metal oxide arrester to get poor, is beneficial to shortening power off overhaul time, prolongs the service life of metal oxide, and has very important meanings of reducing power off loss and guaranteeing an electric system to safely and economically operate.
Description
Technical field
The present invention relates to the protection field of power equipment, specifically relate to a kind of online test method of metal oxide arrester insulating property influence factor.
Background technology
Metal oxide arrester has good nonlinear characteristic and through-current capability, can protect high voltage electric equipment to avoid superpotential infringement, and wherein, superpotential comprises two types of switching overvoltage and Lightning Over-voltage.Therefore, metal oxide arrester at home and abroad obtains a wide range of applications in electrical network as the protection equipment of high voltage electric equipment.
Metal oxide arrester is connected between high-tension line and earth mat, and the quality of self insulating property directly affects the safety of protected high voltage electric equipment, thereby affects power system security.At present, the quality of the application energy real time reaction metal oxide arrester insulating property of on-line monitoring, can be the state of insulation that electric administrative department provides metal oxide arrester in service in real time, to guaranteeing the power system security tool, is of great significance.
On-line monitoring technique in applying at present is to judge the quality of metal oxide arrester insulating property by the situation of change of the total current of monitoring metal oxide arrester leakage current and current in resistance property.When monitoring metal oxide arrester insulating property variation, electric administrative department needs this metal oxide arrester interruption maintenance, by electric power overhaul department, by various electrical test investigations, finds out the factor that causes metal oxide arrester insulating property variation.This way need to expend a large amount of power off times and repair time, not only wastes a large amount of repair times, shortens metal oxide serviceable life, the Socie-economic loss that also can cause larger direct loss of outage and cause because of power failure.Therefore, study a kind of to causing the online test method of metal oxide arrester insulating property variation influence factor, can be electric administrative department and maintenance department formulates metal oxide arrester maintenance scheme reliable basis is provided, thereby be conducive to shorten the interruption maintenance time of metal oxide arrester, for reducing loss of outage, guaranteeing that power system security economical operation tool is of great significance.
Summary of the invention
In order to realize the invention provides a kind of online test method of metal oxide arrester insulating property influence factor to causing the online detection of metal oxide arrester insulating property variation influence factor.
The objective of the invention is to realize by following approach:
The online test method of metal oxide arrester insulating property influence factor, its main points are, comprise following sequential steps:
(1) calculation processing apparatus that electric quantity collector is provided and is attached thereto, electric quantity collector obtains the total current i of leakage current from the metal oxide arrester down conductor
x(t), and send calculation processing apparatus to, calculation processing apparatus utilizes Fourier algorithm to calculate total current i
x(t) amplitude I
x;
(2) simultaneously, calculation processing apparatus is from leakage current total current i
x(t) extract current in resistance property i in
r(t), utilize Fourier algorithm to calculate current in resistance property i
r(t) amplitude I
r, fundamental harmonic resistant leakage current amplitude I
r1amplitude I with the third harmonic current in resistance property
r3;
(3) further, calculation processing apparatus is according to the amplitude I of fundamental harmonic resistant leakage current
r1amplitude I with the third harmonic current in resistance property
r3calculate metal oxide arrester aging coefficient β value;
(4) provide the data analysis judgment means be connected with calculation processing apparatus, this data analysis judgment means is connected with standard apparatus, stores each current threshold of setting in this standard apparatus, comprises the total current threshold values I of leakage current
xset, current in resistance property threshold values I
rset, fundamental harmonic resistant leakage current threshold values I
r1setwith third harmonic current in resistance property I
r3set, the data analysis judgment means is judged according to the current threshold arranged in standard apparatus: I
xwhether be greater than threshold values I
xsetor I
rwhether be greater than threshold values I
rset, if so, enter step (5) and do further judgement; Otherwise, return to step (1);
(5) data analysis judgment means is connected with respectively storer and output display device, store all kinds of analysis results that judge in storer, after data analysis judgment means discriminatory analysis, to from storer, extract corresponding analysis data and be sent to output display device, further being analyzed as follows of data analysis judgment means: if I
xbe greater than threshold values I
xset, the insulating property that are judged as metal oxide arrester are variation seriously, is differentiated the metal oxide arrester directly more renewed without the factor to causing metal oxide arrester insulating property variation; If I
rbe greater than threshold values I
rset, utilize I
r, I
r1, I
r3with β, to causing that metal oxide arrester insulating property variation influence factor is differentiated, concrete criterion is as follows:
If a) I
rbe greater than threshold values I
rsetand temporal evolution is less, is judged as by internal wetted and causes metal oxide arrester insulating property variation;
B) if I
ronly in setting-up time, be greater than threshold values I
rset, be judged as by filth and cause metal oxide arrester insulating property variation;
C) if I
rtransient state is greater than threshold values I
rset, be judged as by interim rising of voltage dependent resistor (VDR) actuator temperature and cause the metal oxide arrester decreasing insulating;
D) if I
rspike occurs, be judged as by shelf depreciation occurs between resistor disc and insulator and cause metal oxide arrester insulating property variation;
E) if I
rbe greater than threshold values I
rset, I
r1be greater than threshold values I
r1set, I
r3be greater than threshold values I
r3setbe greater than threshold values β with aging coefficient β
set, be judged as the insulating property deficiency that is caused metal oxide arrester by the metal oxide quality problems;
F) if I
rbe greater than threshold values I
rset, I
r1be greater than threshold values I
r1set, I
r3be greater than threshold values I
r3setbe less than threshold values β with aging coefficient β
set, be judged as the insulating property deficiency that inner serious aging causes metal oxide arrester;
G) if I
rbe greater than threshold values I
rset, I
r1be less than threshold values I
r1setand I
r3be greater than threshold values I
r3setand aging coefficient β is less than threshold values β
set, be judged as the insulating property deficiency that inner premature ageing causes metal oxide arrester.
Technique scheme has following beneficial effect:
The harmonic information of comprehensive utilization metal oxide arrester leakage current (comprises the leakage current total current, current in resistance property, fundamental current in current in resistance property and the triple harmonic current in current in resistance property), and in conjunction with the metal oxide arrester aging coefficient, the influence factor that causes metal oxide arrester insulating property variation is accurately differentiated, provide reliable basis for formulating metal oxide arrester maintenance scheme, thereby be conducive to shorten the interruption maintenance time of metal oxide arrester, extend metal oxide serviceable life, for reducing loss of outage, guarantee that power system security economical operation tool is of great significance.
The accompanying drawing explanation
Fig. 1 is the process flow diagram of the online test method of a kind of metal oxide arrester insulating property influence factor of providing of the embodiment of the present invention.
Figure 2 shows that the framed structure schematic diagram of on-line measuring device in the embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is done further and described in detail.
Provide a kind of on-line measuring device in the online test method of metal oxide arrester insulating property influence factor of the present invention, this pick-up unit includes electric quantity collector, calculation processing apparatus, data analysis judgment means and the output display device sequentially connected, and wherein data analysis judgment means also connects respectively the storer that stores the standard apparatus of setting current threshold and store each alanysis judgement structure.At first electric quantity collector by obtaining the total current i of leakage current from the metal oxide arrester down conductor
x(t), calculation processing apparatus is according to total current i
x(t) reach the current in resistance property i extracted from wherein
r(t), utilize Fourier algorithm to calculate the total current amplitude I of leakage current
x, current in resistance property amplitude I
r, the fundamental current amplitude I in current in resistance property
r1with the triple harmonic current amplitude I in current in resistance property
r3, and further utilize the fundamental current amplitude I in current in resistance property
r1with the triple harmonic current amplitude I in current in resistance property
r3calculate metal oxide arrester aging coefficient β.If meet I
xbe greater than threshold values I
xsetor I
rbe greater than threshold values I
rset, be judged as the insulating property variation of metal oxide arrester, and then utilize current in resistance property amplitude I
r, the fundamental current amplitude I in current in resistance property
r1, the triple harmonic current amplitude I in current in resistance property
r3form criterion with metal oxide arrester insulation ag(e)ing factor beta, accurately differentiate the influence factor that causes metal oxide arrester insulating property variation, the data analysis judgment means, after discriminatory analysis, will be extracted corresponding analysis data and be sent to output display device from storer.
Referring to Fig. 1, below illustrate the job step of calculation processing apparatus and data analysis judgment means:
1, obtain the total current i of leakage current from the metal oxide arrester down conductor
x(t), utilize Fourier algorithm to calculate total current i
x(t) amplitude I
x;
2, from leakage current total current i
x(t) isolate current in resistance property i in
r(t), utilize Fourier algorithm to calculate current in resistance property i
r(t) amplitude I
r.Wherein, from leakage current total current i
x(t) isolate current in resistance property i in
r(t) calculating formula is suc as formula (1).
Wherein, I
xmfor i
x(t) first maximal value after the waveform zero passage; T is any time; T is i
x(t) constant cycle length; t
0for i
x(t) the corresponding time of first maximal value after the waveform zero passage.
3, utilize Fourier algorithm to calculate current in resistance property i
r(t) the fundamental harmonic resistant leakage current i in
r1(t) amplitude I
r1.I
r(t) first-harmonic and each odd harmonic electric current by current in resistance property forms, and the expansion of its Fourier series is suc as formula (2).
Utilize Fourier algorithm to calculate current in resistance property i
r(t) the fundamental harmonic resistant leakage current i in
r1(t) amplitude I
r1suc as formula (3).
Utilize Fourier algorithm to calculate current in resistance property i
r(t) the third harmonic current in resistance property i in
r3(t) amplitude I
r3suc as formula (4).
4, utilize I
r1and I
r3calculate metal oxide arrester aging coefficient β value, the calculating formula of β is suc as formula (5).
If 5 I
xbe greater than threshold values I
xsetor I
rbe greater than threshold values I
rset, be judged as metal oxide arrester insulating property variation, enter step 6; Otherwise, return to step 1;
If 6 I
xbe greater than threshold values I
xset, the insulating property that are judged as metal oxide arrester are variation seriously, is differentiated the metal oxide arrester directly more renewed without the factor to causing metal oxide arrester insulating property variation; Otherwise, utilize I
r, I
r1, I
r3with β, to causing that metal oxide arrester insulating property variation influence factor is differentiated, concrete criterion is as follows:
If a) I
rbe greater than threshold values I
rsetand temporal evolution is less (calculates I
rthe linear angle of change curve), be judged as by internal wetted and cause metal oxide arrester insulating property variation;
B) if I
ronly in setting-up time, be greater than threshold values I
rset, be judged as by filth and cause metal oxide arrester insulating property variation;
C) if I
rtransient state is greater than threshold values I
rset(calculate its number of times that is greater than threshold values or its time in threshold values whether are less than setting-up time), be judged as by interim rising of voltage dependent resistor (VDR) actuator temperature and cause the metal oxide arrester decreasing insulating;
D) if I
rspike (analysis I appears
rwhether surpass the pulse value of setting, and the time that this value occurs), be judged as by shelf depreciation occurs between resistor disc and insulator and cause metal oxide arrester insulating property variation;
E) if I
rbe greater than threshold values I
rset, I
r1be greater than threshold values I
r1set, I
r3be greater than threshold values I
r3setbe greater than threshold values β with aging coefficient β
set, be judged as the insulating property deficiency that is caused metal oxide arrester by the metal oxide quality problems;
F) if I
rbe greater than threshold values I
rset, I
r1be greater than threshold values I
r1set, I
r3be greater than threshold values I
r3setbe less than threshold values β with aging coefficient β
set, be judged as the insulating property deficiency that inner serious aging causes metal oxide arrester;
G) if I
rbe greater than threshold values I
rset, I
r1be less than threshold values I
r1setand I
r3be greater than threshold values I
r3setand aging coefficient β is less than threshold values β
set, be judged as the insulating property deficiency that inner premature ageing causes metal oxide arrester.
The harmonic information of the inventive method comprehensive utilization metal oxide arrester leakage current (comprises the leakage current total current, current in resistance property, fundamental current in current in resistance property and the triple harmonic current in current in resistance property), and in conjunction with the metal oxide arrester aging coefficient, the influence factor that causes metal oxide arrester insulating property variation is accurately differentiated, provide reliable basis for formulating metal oxide arrester maintenance scheme, thereby be conducive to shorten the interruption maintenance time of metal oxide arrester, extend metal oxide serviceable life, for reducing loss of outage, guarantee that power system security economical operation tool is of great significance.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. the online test method of a metal oxide arrester insulating property influence factor, is characterized in that, comprises following sequential steps:
(1) calculation processing apparatus that electric quantity collector is provided and is attached thereto, electric quantity collector obtains the total current i of leakage current from the metal oxide arrester down conductor
x(t), and send calculation processing apparatus to, calculation processing apparatus utilizes Fourier algorithm to calculate total current i
x(t) amplitude I
x;
(2) simultaneously, calculation processing apparatus is from leakage current total current i
x(t) extract current in resistance property i in
r(t), utilize Fourier algorithm to calculate current in resistance property i
r(t) amplitude I
r, fundamental harmonic resistant leakage current amplitude I
r1amplitude I with the third harmonic current in resistance property
r3;
(3) further, calculation processing apparatus is according to the amplitude I of fundamental harmonic resistant leakage current
r1amplitude I with the third harmonic current in resistance property
r3calculate metal oxide arrester aging coefficient β value;
(4) provide the data analysis judgment means be connected with calculation processing apparatus, this data analysis judgment means is connected with standard apparatus, stores each current threshold of setting in this standard apparatus, comprises the total current threshold values I of leakage current
xset, current in resistance property threshold values I
rset, fundamental harmonic resistant leakage current threshold values I
r1setwith third harmonic current in resistance property threshold values I
r3set, the data analysis judgment means is judged according to the current threshold arranged in standard apparatus: I
xwhether be greater than threshold values I
xsetor I
rwhether be greater than threshold values I
rset, if so, enter step (5) and do further judgement; Otherwise, return to step (1);
(5) data analysis judgment means is connected with respectively storer and output display device, store all kinds of analysis results that judge in storer, after data analysis judgment means discriminatory analysis, to from storer, extract corresponding analysis data and be sent to output display device, further being analyzed as follows of data analysis judgment means: if I
xbe greater than threshold values I
xset, the insulating property that are judged as metal oxide arrester are variation seriously, is differentiated the metal oxide arrester directly more renewed without the factor to causing metal oxide arrester insulating property variation; If I
rbe greater than threshold values I
rset, utilize I
r, I
r1, I
r3with β, to causing that metal oxide arrester insulating property variation influence factor is differentiated, the concrete analysis criterion is as follows:
If a) I
rbe greater than threshold values I
rsetand temporal evolution is less, is judged as by internal wetted and causes metal oxide arrester insulating property variation;
B) if I
ronly be greater than threshold values in setting-up time, be judged as by filth and cause metal oxide arrester insulating property variation;
C) if I
rtransient state is greater than threshold values I
rset, be judged as by interim rising of voltage dependent resistor (VDR) actuator temperature and cause the metal oxide arrester decreasing insulating;
D) if I
rspike occurs, be judged as by shelf depreciation occurs between resistor disc and insulator and cause metal oxide arrester insulating property variation;
E) if I
rbe greater than threshold values I
rset, I
r1be greater than threshold values I
r1set, I
r3be greater than threshold values I
r3setbe greater than threshold values β with aging coefficient β
set, be judged as the insulating property deficiency that is caused metal oxide arrester by the metal oxide quality problems;
F) if I
rbe greater than threshold values I
rset, I
r1be greater than threshold values I
r1set, I
r3be greater than threshold values I
r3setbe less than threshold values β with aging coefficient β
set, be judged as the insulating property deficiency that inner serious aging causes metal oxide arrester;
G) if I
rbe greater than threshold values I
rset, I
r1be less than threshold values I
r1setand I
r3be greater than threshold values I
r3setand aging coefficient β is less than threshold values β
set, be judged as the insulating property deficiency that inner premature ageing causes metal oxide arrester.
2. the online test method of a kind of metal oxide arrester insulating property influence factor according to claim 1, is characterized in that, in step (3), utilizes I
r1and I
r3the calculating formula of calculating metal oxide arrester aging coefficient β value is
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