CN116930746A - On-load tap-changer electrical switching waveform characteristic parameter extraction analysis method and system - Google Patents
On-load tap-changer electrical switching waveform characteristic parameter extraction analysis method and system Download PDFInfo
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Abstract
The invention provides a method and a system for extracting and analyzing waveform characteristic parameters of electrical switching of an on-load tap-changer, wherein the method comprises the following steps: acquiring test waveforms, and determining respective voltage waveforms and current waveforms of an on-load tap-changer access gear and a to-be-accessed gear; extracting a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion; calculating a second characteristic parameter value according to the set second characteristic parameter calculation formula, wherein the first characteristic parameter value, the voltage waveform and the current waveform; determining an abnormality diagnosis result of the test waveform according to the set characteristic parameter abnormality criterion, wherein the first characteristic parameter value and the second characteristic parameter value are determined; and determining a fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the first current waveform. The method and the system realize comprehensive monitoring of the whole process performance of the switch switching test, accurately position abnormal fault conditions and powerfully support the optimal design of the switch.
Description
Technical Field
The invention relates to the field of electrical switching waveform processing analysis, in particular to a method and a system for extracting and analyzing characteristic parameters of an electrical switching waveform of an on-load tap-changer.
Background
The on-load tap-changer is an important component in a converter transformer, in the process of developing the on-load tap-changer with high voltage level, reliable switching of the on-load tap-changer is an important content to be checked in an on-load tap-changer type test, test waveforms of an on-load tap-changer electrical switching test are read, characteristic parameters capable of representing the performance of the tap-changer are extracted, and analysis is an important method for confirming whether the performance of the tap-changer is deteriorated in the test process. At present, a method for reading test waveforms for an electrical switching test of an on-load tap-changer is usually manual reading, and firstly, the sampling frequency of the test waveforms is confirmed; secondly, extracting tapping switch test waveform data at the sampling frequency; thirdly, characteristic parameters in the waveform data are read manually; fourth, the change rule of the characteristic parameters along with the switching times is analyzed, and whether the tapping switch is deteriorated or not is judged. The manual reading of the test waveforms has the following disadvantages: firstly, the test waveform of the tapping switch is read manually, so that the efficiency is low, and the time required for reading each group of data is long; secondly, as the switching test times of the tapping switch are up to 36 ten thousand times, the sampling frequency which can be adopted by manual reading is low, the performance state of the tapping switch cannot be closely monitored, and possible fault working conditions are easily omitted; thirdly, the manual reading of the characteristic parameters of the switching test waveform of the tapping switch is performed manually, the phenomenon that different personnel read results are inconsistent is likely to occur, and the error is large.
Disclosure of Invention
The invention provides a method and a system for extracting and analyzing characteristic parameters of an electrical switching waveform of an on-load tap-changer, which are used for solving the technical problems that the characteristic parameters in an electrical switching test of the on-load tap-changer are low in efficiency and large in error and cannot be comprehensively monitored in all stages of the test in the prior art, so that the characteristic parameters of the electrical switching waveform of the on-load tap-changer are extracted and analyzed in a full-automatic, efficient and high-precision manner, and the full-stage comprehensive monitoring of the test waveform is realized.
According to an aspect of the invention, the invention provides a method for extracting and analyzing characteristic parameters of an electrical switching waveform of an on-load tap-changer, which comprises the following steps:
acquiring test waveforms of an on-load tap-changer electrical switching test, wherein the test waveforms comprise a gear voltage waveform and a gear current waveform of the on-load tap-changer;
determining a first voltage waveform and a first current waveform of the on-load tap-changer connected to a gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform;
extracting a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion;
Calculating a second characteristic parameter value according to the set second characteristic parameter calculation formula, wherein the first characteristic parameter value, the first voltage waveform and the first current waveform are calculated;
determining an abnormality diagnosis result of the test waveform according to the set characteristic parameter abnormality criterion, wherein the first characteristic parameter value and the second characteristic parameter value are determined;
and determining a fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the first current waveform.
Optionally, the determining, according to the gear current waveform, a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear includes:
determining gear current I at the starting action moment of the on-load tap-changer according to the gear current waveform m And I n When I m ＞0，I n When the on-load tap-changer is in the range of 0, determining the switching direction from a gear m to a gear n, wherein the gear m is any one of a gear a and a gear b of the on-load tap-changer, the gear n is a gear corresponding to a non-m gear in the gear a and the gear b of the on-load tap-changer, the first voltage waveform and the first current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer connected to the gear m respectively, and the second voltage waveform and the second current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer to be connected to the gear n respectively.
Optionally, the first characteristic parameter value is extracted from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion, wherein:
the set characteristic parameters to be extracted comprise the starting time t of main on-off contact arcing 1 And end time t 2 Time t for simultaneously connecting two gears of on-load tap-changer 3 Time t for on-load tap-changer to complete gear switching 4 On-off current I of main on-off contact 1 Switching current I of transition contact 2 Recovery voltage U of main on-off contact 1 And the recovery voltage U of the transition contact 2 ；
When the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U x And the voltage value of the (n+1) th voltage sampling point satisfies U m >U x At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 1 Wherein U is x The method comprises the steps that a voltage value is judged for arcing of a contact, the voltage value is determined by the minimum arcing voltage value when the contact is in arcing, the sampling starting moment is the starting action moment of an on-load tap-changer, and N is a natural number;
when the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U y And the voltage value of the (n+1) th voltage sampling point satisfies U m >U y At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 2 Wherein U is y The voltage value is determined for the arc extinction of the contact, and is determined by the minimum recovery voltage value after the contact is opened;
when the current values of the continuous N current sampling points in the second current waveform meet I n ≤I x And the current value of the (n+1) th current sampling point satisfies I n >I x At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 3 Wherein I is x Judging a current value for a gear access loop to be accessed to the on-load tap-changer, and determining by a minimum gear current value after gear access;
when the current values of the continuous N current sampling points in the first current waveform meet I m ≥ I y And the current value of the (n+1) th current sampling point satisfies I m <I y At this time, the (n+1) th current sampling point is extractedAs characteristic parameter t 4 Wherein I is y Judging a current value for the on-load tap-changer to be connected into a gear exit loop, and determining the current value by the minimum gear current value before gear exit;
for the first voltage waveform, a sampling interval t is taken 2 <t<t 3 Voltage U of (2) m Maximum value as characteristic parameter U 1 Is to take the sampling interval t>t 4 Voltage U of (2) m Maximum value as characteristic parameter U 2 Is a characteristic parameter value of (a);
for the first current waveform, a sampling interval t is taken<t 1 Is the current I of (2) m Maximum value as characteristic parameter I 1 Is to take the sampling interval t 3 <t<t 4 Is the current I of (2) m Maximum value as characteristic parameter I 2 Is a characteristic parameter value of (a).
Optionally, the calculating formula of the second characteristic parameter calculates the second characteristic parameter value according to the set second characteristic parameter value, the first voltage waveform and the first current waveform, wherein the calculating formula of the second characteristic parameter is:
wherein t is r Arcing time, t d For a single resistance time, t q For bridging time, W z For the total switching energy, W, of the on-load tap-changer r Switching energy for arcing of on-load tap-changer, W q Switching energy for on-load tap-changer bridging, U m And I m The voltage value in the first voltage waveform and the current value in the first current waveform, respectively.
Optionally, the determining the abnormality diagnosis result of the test waveform according to the set feature parameter abnormality criterion, where the first feature parameter value and the second feature parameter value include:
when any one of the first characteristic parameter value or the second characteristic parameter value meets the corresponding characteristic parameter abnormality criterion, determining waveform abnormality of the test waveform, wherein the characteristic parameter abnormality criterion comprises:
t 1 >t 1a
t 2 >t 2a
t 3 >t 3a
t 4 >t 4a
t q >t q1
t r >t r1
t d >t d1
U 1 >U 1m
U 2 >U 2m
I 1 >I 1m
I 2 >I 2m
W z >W z1
W r >W r1
W q >W q1
wherein t is 1a ，t 2a ，t 3a ，t 4a ，U 1m ，U 2m ，I 1m ，I 2m When the on-load tap-changer is switched normally, taking the starting action moment of the on-load tap-changer as the sampling starting moment, extracting a first characteristic parameter value, t according to a characteristic parameter extraction criterion q1 ，t r1 ，t d1 ，W z1 ，W r1 ，W q1 And when the on-load tap-changer is normally switched, determining a second characteristic parameter value according to a second characteristic parameter calculation formula and the extracted first characteristic parameter value.
Optionally, the determining the fault diagnosis result of the test waveform according to the set fault waveform locating criterion and the first current waveform includes:
in the process of switching the on-load tap-changer from the gear m to the gear n, the gear current value I of the first current waveform m When the fault waveform positioning criterion is continuously met, determining that the on-load tap-changer fails to switch, wherein the test waveform is a fault waveform, and the fault waveform positioning criterion has the following expression:
I m ＞I m1
wherein I is m1 The waveform fault judgment value for the on-load tap-changer test is determined by the minimum gear current value when the gear n is accessed.
According to another aspect of the present invention, there is provided an on-load tap-changer electrical switching waveform characteristic parameter extraction analysis system, the system comprising:
the data acquisition module is used for acquiring test waveforms of an on-load tap-changer electrical switching test, wherein the test waveforms comprise a gear voltage waveform and a gear current waveform of the on-load tap-changer;
the switching direction module is used for determining a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform;
The first extraction module is used for extracting a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion;
the second extraction module is used for calculating a second characteristic parameter value according to a set second characteristic parameter calculation formula, wherein the first characteristic parameter value, the first voltage waveform and the first current waveform;
the first analysis module is used for determining an abnormality diagnosis result of the test waveform according to the set characteristic parameter abnormality criterion, and the first characteristic parameter value and the second characteristic parameter value;
and the second analysis module is used for determining a fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the first current waveform.
Optionally, the switching direction module determines, according to the gear current waveform, a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear, including:
determining gear current I at the starting action moment of the on-load tap-changer according to the gear current waveform m And I n When I m ＞0，I n When=0, the on-load is determinedThe switching direction of the tapping switch is from a gear m to a gear n, wherein the gear m is any one of a gear a and a gear b of the on-load tapping switch, the gear n is a gear corresponding to a non-m gear in the gear a and the gear b of the on-load tapping switch, the first voltage waveform and the first current waveform are a gear voltage waveform and a gear current waveform of the on-load tapping switch connected to the gear m respectively, and the second voltage waveform and the second current waveform are a gear voltage waveform and a gear current waveform of the on-load tapping switch to be connected to the gear n respectively.
Optionally, the first extraction module extracts a first feature parameter value from the test waveform according to the set feature parameter to be extracted and the feature parameter extraction criterion, wherein:
the set characteristic parameters to be extracted comprise the starting time t of main on-off contact arcing 1 And end time t 2 Time t for simultaneously connecting two gears of on-load tap-changer 3 Time t for on-load tap-changer to complete gear switching 4 On-off current I of main on-off contact 1 Switching current I of transition contact 2 Recovery voltage U of main on-off contact 1 And the recovery voltage U of the transition contact 2 ；
When the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U x And the voltage value of the (n+1) th voltage sampling point satisfies U m >U x At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 1 Wherein U is x The method comprises the steps that a voltage value is judged for arcing of a contact, the voltage value is determined by the minimum arcing voltage value when the contact is in arcing, the sampling starting moment is the starting action moment of an on-load tap-changer, and N is a natural number;
when the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U y And the voltage value of the (n+1) th voltage sampling point satisfies U m >U y At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 2 Wherein U is y The voltage value is determined for the arc extinction of the contact, and is determined by the minimum recovery voltage value after the contact is opened;
when the second electricityThe current values of the continuous N current sampling points in the current waveform meet I n ≤I x And the current value of the (n+1) th current sampling point satisfies I n >I x At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 3 Wherein I is x Judging a current value for a gear access loop to be accessed to the on-load tap-changer, and determining by a minimum gear current value after gear access;
when the current values of the continuous N current sampling points in the first current waveform meet I m ≥ I y And the current value of the (n+1) th current sampling point satisfies I m <I y At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 4 Wherein I is y Judging a current value for the on-load tap-changer to be connected into a gear exit loop, and determining the current value by the minimum gear current value before gear exit;
for the first voltage waveform, a sampling interval t is taken 2 <t<t 3 Voltage U of (2) m Maximum value as characteristic parameter U 1 Is to take the sampling interval t>t 4 Voltage U of (2) m Maximum value as characteristic parameter U 2 Is a characteristic parameter value of (a);
for the first current waveform, a sampling interval t is taken<t 1 Is the current I of (2) m Maximum value as characteristic parameter I 1 Is to take the sampling interval t 3 <t<t 4 Is the current I of (2) m Maximum value as characteristic parameter I 2 Is a characteristic parameter value of (a).
Optionally, the second extracting module calculates a second characteristic parameter value according to a set second characteristic parameter calculation formula, where the first characteristic parameter value, the first voltage waveform and the first current waveform are calculated according to the second characteristic parameter calculation formula:
wherein t is r Arcing time, t d For a single resistance time, t q For bridging time, W z Is to haveTotal switching energy, W, of load tap changer r Switching energy for arcing of on-load tap-changer, W q Switching energy for on-load tap-changer bridging, U m And I m The voltage value in the first voltage waveform and the current value in the first current waveform, respectively.
The invention discloses a method and a system for extracting and analyzing waveform characteristic parameters of electrical switching of an on-load tap-changer, wherein the method comprises the following steps: acquiring test waveforms of an electrical switching test of the on-load tap-changer; determining a first voltage waveform and a first current waveform of the on-load tap-changer connected to a gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform; extracting a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion; calculating a second characteristic parameter value according to the set second characteristic parameter calculation formula, wherein the first characteristic parameter value, the first voltage waveform and the first current waveform are calculated; determining an abnormality diagnosis result of the test waveform according to the set characteristic parameter abnormality criterion, wherein the first characteristic parameter value and the second characteristic parameter value are determined; and determining a fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the first current waveform. The method and the system can read test waveforms in batches, fully automatically extract and calculate the characteristic parameter values of the test waveforms in batches according to the set characteristic parameter extraction criteria, judge abnormal waveforms and fault waveforms according to the determined characteristic parameter values, greatly improve the efficiency of test waveform extraction and analysis, and have high accuracy, thereby realizing comprehensive monitoring of the whole process performance of the on-load tap-changer switching test, accurately positioning abnormal fault conditions and strongly supporting the optimal design of the on-load tap-changer.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method for extracting and analyzing characteristic parameters of an electrical switching waveform of an on-load tap changer according to a preferred embodiment of the invention;
FIG. 2 is a schematic diagram of test waveforms for an on-load tap-changer electrical switching test in accordance with a preferred embodiment of the invention;
fig. 3 is a schematic structural diagram of an on-load tap-changer electrical switching waveform characteristic parameter extraction analysis system according to a preferred embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example method
Fig. 1 is a flowchart of a method for extracting and analyzing characteristic parameters of an electrical switching waveform of an on-load tap changer according to a preferred embodiment of the invention. As shown in fig. 1, the method for extracting and analyzing the characteristic parameters of the electrical switching waveform of the on-load tap changer according to the preferred embodiment starts from step 101.
In step 101, a test waveform of an on-load tap-changer electrical switching test is obtained, wherein the test waveform comprises an on-load tap-changer gear voltage waveform and a gear current waveform.
In the preferred embodiment, in order to facilitate the subsequent extraction of the characteristic parameters, the test waveforms of the electrical switching test of the original on-load tap-changer need to be preprocessed, so that the data file modes of all the test waveforms are the same. For example, when Matlab is adopted to write a program to carry out analysis on test waveform data, the data file of the original test waveform is required to be converted into a matrix format which can be identified by Matlab, so that the test waveform of the on-load split-pull power switching test obtained in the step is all a standard data file which has a format which can be identified by the program after being preprocessed.
In step 102, a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear are determined according to the gear current waveform.
Preferably, the determining, according to the gear current waveform, a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear includes:
determining gear current I at the starting action moment of the on-load tap-changer according to the gear current waveform m And I n When I m ＞0，I n When the on-load tap-changer is in the range of 0, determining the switching direction from a gear m to a gear n, wherein the gear m is any one of a gear a and a gear b of the on-load tap-changer, the gear n is a gear corresponding to a non-m gear in the gear a and the gear b of the on-load tap-changer, the first voltage waveform and the first current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer connected to the gear m respectively, and the second voltage waveform and the second current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer to be connected to the gear n respectively.
Fig. 2 is a schematic diagram of test waveforms for an on-load tap-changer electrical switching test according to a preferential treatment embodiment of the invention. As shown in fig. 2, the present preferred embodiment includes voltage waveforms and current waveforms of each of the gear a and the gear b. Comparing the current waveforms, it can be seen that I is when the on-load tap-changer is started a ＞0，I b In this embodiment, the switching direction of the on-load tap-changer is switched from gear a to gear b, i.e. the switch-in gear m is gear a, and the switch-in gear n is gear b, and accordingly, the first voltage waveform and the first current waveform are the voltage waveform U of gear a a And current waveform I a The second voltage waveform and the second current waveform are the voltage waveform U of the gear b b And current waveform I b 。
In step 103, a first characteristic parameter value is extracted from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion.
Preferably, the first characteristic parameter value is extracted from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion, wherein:
the set characteristic parameters to be extracted comprise the starting time t of main on-off contact arcing 1 And end time t 2 Time t for simultaneously connecting two gears of on-load tap-changer 3 Time t for on-load tap-changer to complete gear switching 4 On-off current I of main on-off contact 1 Switching current I of transition contact 2 Recovery voltage U of main on-off contact 1 And the recovery voltage U of the transition contact 2 ；
When the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U x And the voltage value of the (n+1) th voltage sampling point satisfies U m >U x At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 1 Wherein U is x The method comprises the steps that a voltage value is judged for arcing of a contact, the voltage value is determined by the minimum arcing voltage value when the contact is in arcing, the sampling starting moment is the starting action moment of an on-load tap-changer, and N is a natural number;
when the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U y And the voltage value of the (n+1) th voltage sampling point satisfies U m >U y At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 2 Wherein U is y The voltage value is determined for the arc extinction of the contact, and is determined by the minimum recovery voltage value after the contact is opened;
when the current values of the continuous N current sampling points in the second current waveform meet I n ≤I x And the current value of the (n+1) th current sampling point satisfies I n >I x At this time, the (n+1) th current sample is extractedThe moment of the point is taken as a characteristic parameter t 3 Wherein I is x Judging a current value for a gear access loop to be accessed to the on-load tap-changer, and determining by a minimum gear current value after gear access;
when the current values of the continuous N current sampling points in the first current waveform meet I m ≥ I y And the current value of the (n+1) th current sampling point satisfies I m <I y At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 4 Wherein I is y Judging a current value for the on-load tap-changer to be connected into a gear exit loop, and determining the current value by the minimum gear current value before gear exit;
for the first voltage waveform, a sampling interval t is taken 2 <t<t 3 Voltage U of (2) m Maximum value as characteristic parameter U 1 Is to take the sampling interval t>t 4 Voltage U of (2) m Maximum value as characteristic parameter U 2 Is a characteristic parameter value of (a);
for the first current waveform, a sampling interval t is taken<t 1 Is the current I of (2) m Maximum value as characteristic parameter I 1 Is to take the sampling interval t 3 <t<t 4 Is the current I of (2) m Maximum value as characteristic parameter I 2 Is a characteristic parameter value of (a).
In the preferred embodiment, according to the arcing process of the main on-off contact of the on-load tap-changer, the following characteristic parameters are selected: selecting t 1 As the starting moment of the main on-off contact arcing, t 2 As the end time of the main on-off contact arcing, the arcing time t of the tapping switch r =t 2 -t 1 Correspondingly calculating the energy consumed by the tapping switch in the period as arcing switching energy W r . Selecting t 3 At the moment when two gears of the tapping switch are simultaneously connected, the tapping switch flows through circulation, and the single resistance time t d =t 3 -t 2 And (5) representing the action duration of the transition resistor in the switching process. Selecting t 4 The moment is the moment when the tapping switch finishes circulating current and finishes switching, and the bridging time t q =t 4 -t 3 Characterization scoreCorrespondingly calculating the energy consumed by the tap switch in the period of time as bridging switching energy W when the tap switch flows through the circulating current q . The total switching time of the tapping switch is t 4 -t 1 Correspondingly calculating the energy consumed by the tapping switch in the period as the total switching energy W z . Selecting parameters representing the switching-on and switching-off performance of the tapping switch: breaking current I of main on-off contact 1 Switching-on/off current I of transition contact 2 Recovery voltage U of main on-off contact 1 Recovery voltage U of transition contact 2 。
As shown in fig. 2, the characteristic parameter t during normal switching of the on-load tap-changer can be clearly confirmed according to the first voltage waveform, the first current waveform and the second current waveform according to the characteristic parameter extraction criterion 1 ，t 2 ，，t 3 ，t 4 ，，I 1 ，I 2 ，，U 1 And U 2 Is a characteristic parameter value of (a). It should be noted that for different test voltage and current levels, U in the above-mentioned characteristic parameter extraction criterion x 、U y 、I x 、I y Is different in value. U, as at 6000V,1000A load point x =10V，U y =50V，I x =10A，I y =10A。
In step 104, a second characteristic parameter value is calculated from the set second characteristic parameter calculation formula, the first characteristic parameter value, the first voltage waveform and the first current waveform.
Preferably, the calculating formula of the second characteristic parameter calculates the second characteristic parameter value according to the set second characteristic parameter value, the first voltage waveform and the first current waveform, wherein the calculating formula of the second characteristic parameter is:
Wherein t is r Arcing time, t d For a single resistance time, t q For bridging time, W z For the total switching energy, W, of the on-load tap-changer r Switching energy for arcing of on-load tap-changer, W q Switching energy for on-load tap-changer bridging, U m And I m The voltage value in the first voltage waveform and the current value in the first current waveform, respectively.
In step 105, according to the set characteristic parameter abnormality criterion, the first characteristic parameter value and the second characteristic parameter value determine an abnormality diagnosis result of the test waveform.
Preferably, the determining the abnormality diagnosis result of the test waveform according to the set feature parameter abnormality criterion, the first feature parameter value and the second feature parameter value includes:
when any one of the first characteristic parameter value or the second characteristic parameter value meets the corresponding characteristic parameter abnormality criterion, determining waveform abnormality of the test waveform, wherein the characteristic parameter abnormality criterion comprises:
t 1 >t 1a
t 2 >t 2a
t 3 >t 3a
t 4 >t 4a
t q >t q1
t r >t r1
t d >t d1
U 1 >U 1m
U 2 >U 2m
I 1 >I 1m
I 2 >I 2m
W z >W z1
W r >W r1
W q >W q1
wherein t is 1a ，t 2a ，t 3a ，t 4a ，U 1m ，U 2m ，I 1m ，I 2m When the on-load tap-changer is switched normally, taking the starting action moment of the on-load tap-changer as the sampling starting moment, extracting a first characteristic parameter value, t according to a characteristic parameter extraction criterion q1 ，t r1 ，t d1 ，W z1 ，W r1 ，W q1 And when the on-load tap-changer is normally switched, determining a second characteristic parameter value according to a second characteristic parameter calculation formula and the extracted first characteristic parameter value.
In step 106, a fault diagnosis result of the test waveform is determined according to the set fault waveform locating criterion and the first current waveform.
Preferably, the determining the fault waveform in the test waveform according to the set fault waveform locating criterion and the first current waveform includes:
in the process of switching the on-load tap-changer from the gear m to the gear n, the gear current value I of the first current waveform m When the fault waveform positioning criterion is continuously met, determining that the on-load tap-changer fails to switch, wherein the test waveform is a fault waveform, and the fault waveform positioning criterion has the following expression:
I m ＞I m1
wherein I is m1 The waveform fault judgment value for the on-load tap-changer test is determined by the minimum gear current value when the gear n is accessed.
In the preferred embodiment, matlab is adopted to write a program for batch reading of data files of test waveforms and extracting and analyzing characteristic parameters. The characteristic parameter extraction analysis method based on the written program is realized by firstly, reading data files of test waveforms in batches to obtain the test waveforms; then determining a switching direction of a switch according to the test waveform; extracting the characteristic parameters of each group of test waveforms from the test waveforms according to the determined switching direction and characteristic parameter extraction criteria, wherein the characteristic parameters comprise time sequence parameters (arcing time, bridging time and single resistance time), switching-on and switching-off characteristic parameters (main switching-on and switching-off contact switching-off current, transition contact switching-off current, main switching-on and switching-off contact recovery voltage and transition contact recovery voltage), and calculating energy parameter values (arcing switching energy, bridging switching energy and total switching energy) according to the extracted time sequence parameters and gear voltage and current of an access gear; and finally, determining an abnormal diagnosis result of the test waveform according to the extracted and calculated determined characteristic parameter value and the set characteristic parameter abnormal criterion, and determining the fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the gear current waveform. The method according to the preferred embodiment has the following beneficial effects:
1. The method can replace a manual test waveform characteristic parameter extraction method, realizes full-automatic extraction of test waveform characteristic parameters of an on-load tap-changer switching test, and has high extraction efficiency. For test waveform data with the capacity of 10GB, the processing time is only 2 hours;
2. the automatic extraction of the characteristic parameters is realized by adopting Matlab or other software programming programs, so that the manual reading errors caused by manual reading are avoided, and the parameter extraction accuracy is high;
3. the characteristic parameter extraction of full waveform data of the on-load tap-changer switching test can be realized without sampling analysis, so that the overall monitoring of the overall process performance of the tap-changer switching test and the accurate positioning of abnormal fault conditions are realized, and the tap-changer optimization design is strongly supported.
Example System
Fig. 3 is a schematic structural diagram of an on-load tap-changer electrical switching waveform characteristic parameter extraction analysis system according to a preferred embodiment of the invention. As shown in fig. 3, the on-load tap-changer electrical switching waveform characteristic parameter extraction analysis system 300 according to the present preferred embodiment includes:
the data acquisition module 301 is configured to acquire a test waveform of an electrical switching test of the on-load tap-changer, where the test waveform includes a gear voltage waveform and a gear current waveform of the on-load tap-changer;
The switching direction module 302 is configured to determine a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform;
a first extracting module 303, configured to extract a first feature parameter value from the test waveform according to the set feature parameter to be extracted and a feature parameter extraction criterion;
a second extraction module 304, configured to calculate a second characteristic parameter value according to a set second characteristic parameter calculation formula, where the first characteristic parameter value, the first voltage waveform and the first current waveform are the first characteristic parameter value;
a first analysis module 305, configured to determine an abnormality diagnosis result of the test waveform according to the set feature parameter abnormality criterion, where the first feature parameter value and the second feature parameter value are set;
the second analysis module 306 determines a fault diagnosis result of the test waveform according to the set fault waveform locating criterion and the first current waveform.
Preferably, the switching direction module 302 determines a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform, including:
Determining gear current I at the starting action moment of the on-load tap-changer according to the gear current waveform m And I n When I m ＞0，I n When the on-load tap-changer is in the range of 0, determining the switching direction from a gear m to a gear n, wherein the gear m is any one of a gear a and a gear b of the on-load tap-changer, the gear n is a gear corresponding to a non-m gear in the gear a and the gear b of the on-load tap-changer, the first voltage waveform and the first current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer connected to the gear m respectively, and the second voltage waveform and the second current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer to be connected to the gear n respectively.
Preferably, the first extracting module 303 extracts a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion, where:
the set characteristic parameters to be extracted comprise the starting time t of main on-off contact arcing 1 And end time t 2 Time t for simultaneously connecting two gears of on-load tap-changer 3 Time t for on-load tap-changer to complete gear switching 4 On-off current I of main on-off contact 1 Switching current I of transition contact 2 Recovery voltage U of main on-off contact 1 And transition touchRecovery voltage U of head 2 ；
When the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U x And the voltage value of the (n+1) th voltage sampling point satisfies U m >U x At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 1 Wherein U is x The method comprises the steps that a voltage value is judged for arcing of a contact, the voltage value is determined by the minimum arcing voltage value when the contact is in arcing, the sampling starting moment is the starting action moment of an on-load tap-changer, and N is a natural number;
when the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U y And the voltage value of the (n+1) th voltage sampling point satisfies U m >U y At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 2 Wherein U is y The voltage value is determined for the arc extinction of the contact, and is determined by the minimum recovery voltage value after the contact is opened;
when the current values of the continuous N current sampling points in the second current waveform meet I n ≤I x And the current value of the (n+1) th current sampling point satisfies I n >I x At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 3 Wherein I is x Judging a current value for a gear access loop to be accessed to the on-load tap-changer, and determining by a minimum gear current value after gear access;
When the current values of the continuous N current sampling points in the first current waveform meet I m ≥ I y And the current value of the (n+1) th current sampling point satisfies I m <I y At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 4 Wherein I is y Judging a current value for the on-load tap-changer to be connected into a gear exit loop, and determining the current value by the minimum gear current value before gear exit;
for the first voltage waveform, a sampling interval t is taken 2 <t<t 3 Voltage U of (2) m Maximum value as characteristic parameter U 1 Is to take the sampling interval t>t 4 Voltage U of (2) m Maximum value as characteristic parameter U 2 Is a characteristic parameter value of (a);
for the first current waveform, a sampling interval t is taken<t 1 Is the current I of (2) m Maximum value as characteristic parameter I 1 Is to take the sampling interval t 3 <t<t 4 Is the current I of (2) m Maximum value as characteristic parameter I 2 Is a characteristic parameter value of (a).
Preferably, the second extracting module 304 calculates a second characteristic parameter value according to a set second characteristic parameter calculation formula, where the first characteristic parameter value, the first voltage waveform and the first current waveform are calculated according to the second characteristic parameter calculation formula:
wherein t is r Arcing time, t d For a single resistance time, t q For bridging time, W z For the total switching energy, W, of the on-load tap-changer r Switching energy for arcing of on-load tap-changer, W q Switching energy for on-load tap-changer bridging, U m And I m The voltage value in the first voltage waveform and the current value in the first current waveform, respectively.
Preferably, the first analysis module 305 determines an abnormality diagnosis result of the test waveform according to the set feature parameter abnormality criterion, where the first feature parameter value and the second feature parameter value include:
when any one of the first characteristic parameter value or the second characteristic parameter value meets the corresponding characteristic parameter abnormality criterion, determining waveform abnormality of the test waveform, wherein the characteristic parameter abnormality criterion comprises:
t 1 >t 1a
t 2 >t 2a
t 3 >t 3a
t 4 >t 4a
t q >t q1
t r >t r1
t d >t d1
U 1 >U 1m
U 2 >U 2m
I 1 >I 1m
I 2 >I 2m
W z >W z1
W r >W r1
W q >W q1
wherein t is 1a ，t 2a ，t 3a ，t 4a ，U 1m ，U 2m ，I 1m ，I 2m When the on-load tap-changer is switched normally, taking the starting action moment of the on-load tap-changer as the sampling starting moment, extracting a first characteristic parameter value, t according to a characteristic parameter extraction criterion q1 ，t r1 ，t d1 ，W z1 ，W r1 ，W q1 And when the on-load tap-changer is normally switched, determining a second characteristic parameter value according to a second characteristic parameter calculation formula and the extracted first characteristic parameter value.
Preferably, the second analysis module 306 determines a fault waveform in the test waveform according to the set fault waveform locating criteria and the first current waveform, including:
In the process of switching the on-load tap-changer from the gear m to the gear n, the gear current value I of the first current waveform m When the fault waveform positioning criterion is continuously met, determining that the on-load tap-changer fails to switch, wherein the test waveform is a fault waveform, and the fault waveform positioning criterion has the following expression:
I m ＞I m1
wherein I is m1 The waveform fault judgment value for the on-load tap-changer test is determined by the minimum gear current value when the gear n is accessed.
The on-load tap-changer electrical switching waveform characteristic parameter extraction analysis system according to the preferred embodiment obtains a test waveform, extracts a characteristic parameter value according to a test waveform and a characteristic parameter extraction criterion after determining a switching direction of the switch, calculates a second characteristic parameter value according to the extracted characteristic parameter value and a second characteristic parameter calculation formula, determines an abnormal diagnosis result of the test waveform according to the characteristic parameter value, and determines a fault diagnosis result of the test waveform according to a gear current value.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The method for extracting and analyzing the characteristic parameters of the electrical switching waveform of the on-load tap-changer is characterized by comprising the following steps:
acquiring test waveforms of an on-load tap-changer electrical switching test, wherein the test waveforms comprise a gear voltage waveform and a gear current waveform of the on-load tap-changer;
determining a first voltage waveform and a first current waveform of the on-load tap-changer connected to a gear, and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform;
extracting a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion;
calculating a second characteristic parameter value according to the set second characteristic parameter calculation formula, wherein the first characteristic parameter value, the first voltage waveform and the first current waveform are calculated;
determining an abnormal waveform of the test waveform according to the set characteristic parameter abnormal criterion, wherein the first characteristic parameter value and the second characteristic parameter value are determined;
and determining a fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the first current waveform.
2. The method of claim 1, wherein determining a first voltage waveform and a first current waveform for the on-load tap-changer to engage the gear and a second voltage waveform and a second current waveform for the on-load tap-changer to engage the gear from the gear current waveform comprises:
Determining gear current I at the starting action moment of the on-load tap-changer according to the gear current waveform m And I n When I m ＞0，I n When the on-load tap-changer is in the range of 0, determining the switching direction from a gear m to a gear n, wherein the gear m is any one of a gear a and a gear b of the on-load tap-changer, the gear n is a gear corresponding to a non-m gear in the gear a and the gear b of the on-load tap-changer, the first voltage waveform and the first current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer connected to the gear m respectively, and the second voltage waveform and the second current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer to be connected to the gear n respectively.
3. The method according to claim 2, wherein the first characteristic parameter value is extracted from the test waveform according to the set characteristic parameter to be extracted and a characteristic parameter extraction criterion, wherein:
the set characteristic parameters to be extracted comprise the starting time t of main on-off contact arcing 1 And end time t 2 Time t for simultaneously connecting two gears of on-load tap-changer 3 Time t for on-load tap-changer to complete gear switching 4 On-off current I of main on-off contact 1 Switching current I of transition contact 2 Recovery voltage U of main on-off contact 1 And the recovery voltage U of the transition contact 2 ；
When the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U x And the voltage value of the (n+1) th voltage sampling point satisfies U m >U x At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 1 Wherein U is x The method comprises the steps that a voltage value is judged for arcing of a contact, the voltage value is determined by the minimum arcing voltage value when the contact is in arcing, the sampling starting moment is the starting action moment of an on-load tap-changer, and N is a natural number;
when the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U y And the voltage value of the (n+1) th voltage sampling point satisfies U m >U y At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 2 Wherein U is y The voltage value is determined for the arc extinction of the contact, and is determined by the minimum recovery voltage value after the contact is opened;
when the current values of the continuous N current sampling points in the second current waveform meet I n ≤I x And the current value of the (n+1) th current sampling point satisfies I n >I x At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 3 Wherein I is x Judging a current value for a gear access loop to be accessed to the on-load tap-changer, and determining by a minimum gear current value after gear access;
When the current values of the continuous N current sampling points in the first current waveform meet I m ≥ I y And the current value of the (n+1) th current sampling point satisfies I m < I y At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 4 Wherein I is y Judging a current value for the on-load tap-changer to be connected into a gear exit loop, and determining the current value by the minimum gear current value before gear exit;
for the first voltage waveform, a sampling interval t is taken 2 < t< t 3 Voltage U of (2) m Maximum value as characteristic parameter U 1 Is to take the sampling interval t> t 4 Voltage U of (2) m Maximum value as characteristic parameter U 2 Is a characteristic parameter value of (a);
for the first current waveform, a sampling interval t is taken< t 1 Is the current I of (2) m Maximum value as characteristic parameter I 1 Is to take the sampling interval t 3 < t< t 4 Is the current I of (2) m Maximum value as characteristic parameter I 2 Is a characteristic parameter value of (a).
4. A method according to claim 3, wherein the second characteristic parameter value is calculated according to a set second characteristic parameter calculation formula, the first characteristic parameter value, the first voltage waveform and the first current waveform, wherein the second characteristic parameter calculation formula is:
wherein t is r Arcing time, t d For a single resistance time, t q For bridging time, W z For the total switching energy, W, of the on-load tap-changer r Switching energy for arcing of on-load tap-changer, W q Switching energy for on-load tap-changer bridging, U m And I m The voltage value in the first voltage waveform and the current value in the first current waveform, respectively.
5. The method of claim 4, wherein determining the abnormal waveform of the test waveform from the first and second characteristic parameter values according to the set characteristic parameter abnormality criteria comprises:
when any one of the first characteristic parameter value or the second characteristic parameter value meets the corresponding characteristic parameter abnormality criterion, determining waveform abnormality of the test waveform, wherein the characteristic parameter abnormality criterion comprises:
t 1 > t 1a
t 2 > t 2a
t 3 > t 3a
t 4 > t 4a
t q >t q1
t r >t r1
t d >t d1
U 1 >U 1m
U 2 >U 2m
I 1 >I 1m
I 2 >I 2m
W z >W z1
W r >W r1
W q >W q1
wherein t is 1a ，t 2a ，t 3a ，t 4a ，U 1m ，U 2m ，I 1m ，I 2m When the on-load tap-changer is switched normally, taking the starting action moment of the on-load tap-changer as the sampling starting moment, extracting a first characteristic parameter value, t according to a characteristic parameter extraction criterion q1 ，t r1 ，t d1 ，W z1 ，W r1 ，W q1 And when the on-load tap-changer is normally switched, determining a second characteristic parameter value according to a second characteristic parameter calculation formula and the extracted first characteristic parameter value.
6. The method of claim 2, wherein said determining a fault diagnosis of said test waveform based on said set fault waveform locating criteria and said first current waveform comprises:
In the process of switching the on-load tap-changer from the gear m to the gear n, the gear current value I of the first current waveform m When the fault waveform positioning criterion is continuously met, determining that the on-load tap-changer fails to switch, wherein the test waveform is a fault waveform, and the fault waveform positioning criterion has the following expression:
I m ＞I m1
wherein I is m1 The waveform fault judgment value for the on-load tap-changer test is determined by the minimum gear current value when the gear n is accessed.
7. An on-load tap-changer electrical switching waveform characteristic parameter extraction analysis system, the system comprising:
the data acquisition module is used for acquiring test waveforms of an on-load tap-changer electrical switching test, wherein the test waveforms comprise a gear voltage waveform and a gear current waveform of the on-load tap-changer;
the switching direction module is used for determining a first voltage waveform and a first current waveform of the on-load tap-changer connected to the gear and a second voltage waveform and a second current waveform of the on-load tap-changer to be connected to the gear according to the gear current waveform;
the first extraction module is used for extracting a first characteristic parameter value from the test waveform according to the set characteristic parameter to be extracted and the characteristic parameter extraction criterion;
The second extraction module is used for calculating a second characteristic parameter value according to a set second characteristic parameter calculation formula, wherein the first characteristic parameter value, the first voltage waveform and the first current waveform;
the first analysis module is used for determining abnormal waveforms of the test waveforms according to the set characteristic parameter abnormal criteria, wherein the first characteristic parameter values and the second characteristic parameter values are determined;
and the second analysis module is used for determining a fault diagnosis result of the test waveform according to the set fault waveform positioning criterion and the first current waveform.
8. The system of claim 7, wherein the switching direction module determines a first voltage waveform and a first current waveform for the on-load tap-changer to engage the gear and a second voltage waveform and a second current waveform for the on-load tap-changer to engage the gear from the gear current waveform, comprising:
determining gear current I at the starting action moment of the on-load tap-changer according to the gear current waveform m And I n When I m ＞0，I n When the on-load tap-changer is in the range of 0, determining the switching direction from a gear m to a gear n, wherein the gear m is any one of a gear a and a gear b of the on-load tap-changer, the gear n is a gear corresponding to a non-m gear in the gear a and the gear b of the on-load tap-changer, the first voltage waveform and the first current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer connected to the gear m respectively, and the second voltage waveform and the second current waveform are a gear voltage waveform and a gear current waveform of the on-load tap-changer to be connected to the gear n respectively.
9. The system of claim 8, wherein the first extraction module extracts a first feature parameter value from the test waveform according to the set feature parameters to be extracted and feature parameter extraction criteria, wherein:
the set characteristic parameters to be extracted comprise the starting time t of main on-off contact arcing 1 And end time t 2 Time t for simultaneously connecting two gears of on-load tap-changer 3 Time t for on-load tap-changer to complete gear switching 4 On-off current I of main on-off contact 1 Switching current I of transition contact 2 Recovery voltage U of main on-off contact 1 And the recovery voltage U of the transition contact 2 ；
When the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U x And the voltage value of the (n+1) th voltage sampling point satisfies U m >U x At the time, the (n+1) th is extractedThe moment of the voltage sampling point is taken as a characteristic parameter t 1 Wherein U is x The method comprises the steps that a voltage value is judged for arcing of a contact, the voltage value is determined by the minimum arcing voltage value when the contact is in arcing, the sampling starting moment is the starting action moment of an on-load tap-changer, and N is a natural number;
when the voltage values of the continuous N voltage sampling points in the first voltage waveform meet U m ≤U y And the voltage value of the (n+1) th voltage sampling point satisfies U m >U y At the time, the time of the (n+1) th voltage sampling point is extracted as a characteristic parameter t 2 Wherein U is y The voltage value is determined for the arc extinction of the contact, and is determined by the minimum recovery voltage value after the contact is opened;
when the current values of the continuous N current sampling points in the second current waveform meet I n ≤I x And the current value of the (n+1) th current sampling point satisfies I n >I x At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 3 Wherein I is x Judging a current value for a gear access loop to be accessed to the on-load tap-changer, and determining by a minimum gear current value after gear access;
when the current values of the continuous N current sampling points in the first current waveform meet I m ≥ I y And the current value of the (n+1) th current sampling point satisfies I m < I y At the time, the time of the (n+1) th current sampling point is extracted as a characteristic parameter t 4 Wherein I is y Judging a current value for the on-load tap-changer to be connected into a gear exit loop, and determining the current value by the minimum gear current value before gear exit;
for the first voltage waveform, a sampling interval t is taken 2 < t< t 3 Voltage U of (2) m Maximum value as characteristic parameter U 1 Is to take the sampling interval t> t 4 Voltage U of (2) m Maximum value as characteristic parameter U 2 Is a characteristic parameter value of (a);
For the first current waveform, a sampling interval t is taken< t 1 Is the current I of (2) m Maximum value as characteristic parameter I 1 Is obtained by taking the characteristic parameter values of (1)Sample interval t 3 < t< t 4 Is the current I of (2) m Maximum value as characteristic parameter I 2 Is a characteristic parameter value of (a).
10. The system of claim 9, wherein the second extraction module calculates a second characteristic parameter value from the set second characteristic parameter calculation formula, the first characteristic parameter value, the first voltage waveform and the first current waveform, wherein the second characteristic parameter calculation formula is:
wherein t is r Arcing time, t d For a single resistance time, t q For bridging time, W z For the total switching energy, W, of the on-load tap-changer r Switching energy for arcing of on-load tap-changer, W q Switching energy for on-load tap-changer bridging, U m And I m The voltage value in the first voltage waveform and the current value in the first current waveform, respectively.
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| JP2002198230A (en) * | 2000-12-27 | 2002-07-12 | Hokuriku Denki Seizo Kk | Changeover-confirming mechanism and protective system for on-load tap changer |
| CN105759200A (en) * | 2016-02-18 | 2016-07-13 | 中国农业大学 | Method for online monitoring of work state of on-load tap-changer and early warning |
| CN108490345A (en) * | 2018-03-26 | 2018-09-04 | 盐城博鸣信息科技有限公司 | A kind of fault simulation diagnostic method of converter power transformer tap switch |
| CN109143047A (en) * | 2018-07-11 | 2019-01-04 | 中国农业大学 | A kind of parameter test method and device of on-load tap changers of transformers |
| CN114019365A (en) * | 2021-11-05 | 2022-02-08 | 国网河南省电力公司电力科学研究院 | On-load tap-changer fault diagnosis method based on gas detection technology in oil |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002198230A (en) * | 2000-12-27 | 2002-07-12 | Hokuriku Denki Seizo Kk | Changeover-confirming mechanism and protective system for on-load tap changer |
| CN105759200A (en) * | 2016-02-18 | 2016-07-13 | 中国农业大学 | Method for online monitoring of work state of on-load tap-changer and early warning |
| CN108490345A (en) * | 2018-03-26 | 2018-09-04 | 盐城博鸣信息科技有限公司 | A kind of fault simulation diagnostic method of converter power transformer tap switch |
| CN109143047A (en) * | 2018-07-11 | 2019-01-04 | 中国农业大学 | A kind of parameter test method and device of on-load tap changers of transformers |
| CN114019365A (en) * | 2021-11-05 | 2022-02-08 | 国网河南省电力公司电力科学研究院 | On-load tap-changer fault diagnosis method based on gas detection technology in oil |
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