CN117388575B - Data vector testing method and system for current transformer of power supply and distribution system - Google Patents
Data vector testing method and system for current transformer of power supply and distribution system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of power supply and distribution, and discloses a data vector testing method and system for a current transformer of a power supply and distribution system, which solve the problem of inaccuracy of the polarity of a power transmission line judged by a vector tester according to a difference value of vector angle differences. The test method provided by the invention comprises the following steps: the method comprises the steps of obtaining an induction test current and a reference test current, obtaining a vector angle difference and a reference vector angle difference based on the induction test current and the reference test current, establishing a mapping relation based on historical data of the vector angle difference and the reference vector angle difference, and judging the accuracy of power transmission line polarity judgment by a power supply and distribution system based on the mapping relation, so that the safety of the power transmission line and the power supply and distribution system is ensured.
Description
Technical Field
The invention relates to the technical field of power supply and distribution, in particular to a data vector testing method and system for a current transformer of a power supply and distribution system.
Background
A power supply and distribution system is a system that converts voltage and distributes power directly to end users, which is composed of various power distribution devices (or elements) and power distribution facilities and power lines, and the power supply system from the outlet of a step-down power distribution substation (high-voltage power distribution substation) to the user side in a power system is generally called a power supply and distribution system at present, and the power line is one of important components of the power supply and distribution system, so that the installation of the power line needs to be performed according to the polarity of the power line, otherwise, the safety of the power line cannot be guaranteed.
In order to detect the polarity of a power transmission line of a power supply and distribution system in the prior art, it is often required to implement current rising by using a current rising device, then perform testing by using a vector tester after induction of a current transformer, and determine the polarity of the power transmission line by using a vector angle difference output by the vector tester, for example, a dual-end asynchronous polarity test system and method for a high-voltage power transmission line with the patent application number of 201811113561.7 are disclosed, and the polarity of the power transmission line is obtained by comparing the vector angle difference with a preset angle range.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a data vector testing method and system for a current transformer of a power supply and distribution system, which solve the problem of inaccuracy of the polarity of a power transmission line judged by a vector tester according to the difference value of vector angle differences.
(II) technical scheme
In order to solve the problems, the invention provides the following technical scheme: a method for testing data vectors of current transformers of a power supply and distribution system, the method comprising:
acquiring an induced test current and a reference test current, and acquiring a vector angle difference and a reference vector angle difference based on the induced test current and the reference test current;
establishing a mapping relation based on historical data of the vector angle difference and the reference vector angle difference;
and judging the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system based on the mapping relation.
The invention also provides a data vector testing system of the current transformer of the power supply and distribution system, which comprises:
the current acquisition module is used for acquiring an induced test current and a reference test current, and acquiring a vector angle difference and a reference vector angle difference based on the induced test current and the reference test current;
the relation building module is used for building a mapping relation based on historical data of the vector angle difference and the reference vector angle difference;
and the polarity judging module is used for judging the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system based on the mapping relation.
(III) beneficial effects
Compared with the prior art, the invention provides a data vector testing method and system for a current transformer of a power supply and distribution system, and the method and system have the following beneficial effects:
1. the vector testing method and the vector testing system firstly acquire the induction testing current and perform pretreatment, acquire the vector angle difference and the reference vector angle difference based on the pretreated induction testing current, and input the vector angle difference and the reference vector angle difference into the established mapping relation so as to judge whether the polarity of the power transmission line is accurately judged by the power supply and distribution system or not and verify the polarity, thereby ensuring the safety of the power transmission line and the power supply and distribution system, avoiding the occurrence of the inaccurate problem of the polarity of the power transmission line judged by the conventional vector tester according to the difference value of the vector angle difference, and ensuring the safety of the judged power transmission line polarity.
2. The vector test method and the vector test system also preprocess the obtained induction test current, judge whether harmonic exists in the induction test current, further verify the existence of the harmonic in the power supply and distribution system by detecting and processing the temperature and the current of a power capacitor in the power supply and distribution system, mark the induction test current based on the harmonic, and further avoid outputting the induction test current with the harmonic to a vector tester and a reference vector tester for vector angle difference and reference vector angle difference calculation, and further ensure the accuracy of the induction test current.
3. The vector testing method and system also verify the judged polarity of the power transmission line, then connect the power transmission line to the power supply and distribution system according to the polarity, count the number of times of the polarity which does not meet the mapping relation, and re-collect the induced test current when the number of times exceeds a threshold value so as to establish the mapping relation, thereby further ensuring the accuracy and the timeliness of the established mapping relation and ensuring the accuracy of the polarity of the power transmission line.
Drawings
Fig. 1 is a schematic flow chart of a test method provided by the invention.
Fig. 2 is a schematic circuit diagram of a current acquisition module for preprocessing an induced test current according to the present invention.
Fig. 3 is a schematic structural diagram of a test system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, the present invention provides a new technical solution: a method and a system for testing data vectors of current transformers of a power supply and distribution system are provided, wherein the testing method comprises the following steps:
s1, acquiring an induction test current and a reference test current, and obtaining a vector angle difference and a reference vector angle difference based on the induction test current and the reference test current.
Specifically, the power transmission line and the current transformer of the power supply and distribution system form a closed loop electric connection, the current transformer is arranged at one side of the power transmission line of the power supply and distribution system and used for generating induction test current, the current transformer comprises a current transformer of the current transformer and a reference current transformer, the current transformer of the current transformer side is arranged at one side of the current transformer and used for generating induction test current, the reference current transformer is also arranged at one side of the current transformer and used for generating reference test current, the main vector tester calculates based on the induction test current to obtain vector angle difference, the reference vector tester outputs a reference vector angle difference based on a reference test current detected by the reference current transformer, wherein the types of the reference current transformer and the current transformer at the side of the current transformer are different, so that different detection results are ensured, namely, the vector angle difference is ensured to be different from the reference vector angle difference, wherein the vector angle difference is calculated by the main vector tester based on the induction test current and a preset threshold current, the reference vector angle difference is calculated by the reference vector tester based on the reference test current and the preset threshold current, and the specific vector angle difference is calculated in the following way:
first, the current is expressed as complex: the magnitude and phase angle of the current are expressed in complex form, e.g., i1=i1mθ1 and i2=i2mθ2, where i1m and i2m are the magnitudes of the currents, respectively, θ1 and θ2 are the phase angles of the currents, e.g., assuming two currents i1=5a° 30 ° and i2=10a° 120 °, respectively, expressed in complex form: i1 =5+_30° and i2=10+_120°;
then calculate the phase angle difference: subtracting the phase angles of the two currents to obtain a phase angle difference delta theta=theta 2-theta 1, wherein delta theta=120 ° -30 ° =90 °;
the second is to normalize the phase angle difference: the phase angle difference is normalized to a range of-180 deg. to +180 deg.. If the phase angle difference is greater than +180°, 360 ° is subtracted; if the phase angle difference is smaller than-180 degrees, 360 degrees are added, and the adjustment is not needed because the 90 degrees are in the range of-180 degrees to 180 degrees;
finally, calculating the vector angle difference: the normalized phase angle difference is divided by 2pi and multiplied by 360 to obtain a vector angle difference, and the vector angle difference between the current I1 and the current I2 is 90 °.
The reference vector angle difference is calculated in a similar manner to the vector angle difference, and the reference vector tester obtains the reference vector angle difference based on the reference test current.
When the vector tester calculates the vector angle difference based on the induction test current, if the harmonic exists, the calculated vector angle difference may have an error, and if the polarity of the power transmission line is judged based on the vector angle difference, whether the detected induction test current has the harmonic or not needs to be detected before the vector angle difference is calculated, so that the accuracy of the judged polarity of the power transmission line can be ensured, and further, the obtaining of the induction test current and the reference test current comprises the following steps:
judging whether harmonic exists or not based on the induction test current, and if the harmonic exists, marking the induction test current.
Specifically, the current transformer T1 detects an induced test current, where the current transformer is an up-converter side current transformer, the induced test current is an ac signal, the induced test current is described as an induced current signal, the induced current signal is divided by a resistor R2 and a resistor R12 to avoid damage to components caused by excessive induced current signals, the divided induced current signal is transmitted to the multiplier V1 through a resistor R14, the multiplier V1 multiplies the induced current signal with a first signal transmitted through a resistor R13 to output a frequency difference and a frequency sum of the first signal and the induced current signal, the first signal is a 50Hz current signal without noise, after the frequency difference and the frequency sum are filtered by a low-pass filter with a resistor R6, a capacitor C3 and an operational amplifier U3B as cores, only the existence of the frequency difference is reserved, if the frequency difference delays the transistor Q2 by the resistor R8 and the capacitor C4, the existence of harmonics in the induced current signal is also indicated, if the harmonic is present in the induced current signal, based on the existence of the induced test current, the harmonic is not indicated, and if the harmonic is not present, the harmonic is not indicated, and the test cannot be performed if the harmonic is conducted, and the harmonic is not indicated.
Still further, the marking the induced test current includes:
and judging the current and the temperature of a power capacitor in the power supply and distribution system based on the harmonic wave to obtain marking data, and marking the induction test current based on the marking data.
Specifically, after the triode Q2 is conducted based on the detected harmonic wave, the triode Q2 conducts the diode D2, the diode D2 conducts the thyristors Q4 and Q1 through the capacitor C1, the thyristors Q4 and Q1 respectively output current signals and temperature signals of a power capacitor in a power supply and distribution system to the resistor R5 and the resistor R18, wherein the current signals are acquired through a Hall current sensor, the temperature signals are acquired through an infrared temperature sensor, the current signals and the temperature signals are analog signals, the prior art is omitted, the resistor R5 divides the current signals into two paths, one path is directly output to an in-phase end of the operational amplifier U4B, the other path is delayed through the resistor R9 and the capacitor C5 and then is output to an inverting end of the operational amplifier U4B, the operational amplifier U4B performs subtraction operation on the two paths of current signals to obtain a first variation signal of the two current signals, the first change signal is a change value of the current signal after harmonic occurrence, if the current signal conducts the voltage stabilizing tube D4, the current of the power capacitor is greatly increased after harmonic occurrence, the voltage stabilizing tube D4 outputs the first change signal to the AND gate U3A, the temperature signal is divided into two paths, one path is output to the same phase end of the operational amplifier U2B through the resistor R19, the other path is delayed through the resistor R18 and the capacitor C6 and then is output to the operational amplifier U2B, the operational amplifier U2B performs subtraction operation on the two paths of temperature signals and outputs a second change signal, wherein the second change signal is the change value of the temperature signal after harmonic occurrence, if the second change signal conducts the diode D3, the temperature of the power capacitor is increased after harmonic occurrence, the second change signal is output to the second pins 2 and 3 pins of the switch S1 through the resistor R16, the capacitor C2 is stored on the 1 pin of the and gate U1A, and at the same time, the second change signal turns on the relay K1, the relay K1 disconnects the 2 pin of the switch S1 from the 3 pin and connects the 2 pin to the 1 pin, because the temperature sensor is always detecting the temperature signal of the power capacitor, if the temperature is always rising in the process, the operational amplifier U2B is always subtracting, a plurality of second change signals may be obtained in the process, if the second change signal appears again, which indicates that the temperature of the power capacitor is always rising after the harmonic appears, the second change signal output again and the second change signal stored on the 1 pin of the and gate U1A are processed and output a rising signal, the rising signal is output to the and gate U3A through the diode D1, the and gate U3A is processed and operated to obtain the flag data, which indicates that the harmonic at that the moment has caused the abnormality of the elements in the power supply and distribution system, the flag data is output to the upper computer, if the upper computer is based on the flag 3A detected by the flag, the flag is not sensed by the flag, the test error vector is not sensed by the upper computer, and the test vector is not sensed by the test vector is calculated, and the test is able to be output.
The reference test current is not marked, after the main vector tester obtains a marking signal, the marking signal is also output to the reference vector tester, and after the reference vector tester receives the marking signal, the reference vector tester does not calculate the reference test current to obtain the reference vector angle difference.
S2, establishing a mapping relation based on historical data of the vector angle difference and the reference vector angle difference.
Specifically, after the main vector tester receives unmarked induction test current, the main vector tester calculates a vector angle difference based on the induction test current, a plurality of groups of historical vector angle differences and historical reference angle vector differences are stored on the upper computer, the upper computer respectively takes the historical vector angle differences and the historical reference angle vector differences as data sets to carry out multiple tests, so that a mapping relation between the historical vector angle differences and the historical reference angle vector differences is established, the mapping relation is stored on the upper computer, and after the vector angle differences and the reference angle vector differences respectively output by the main vector tester and the reference vector tester are received, the vector angle differences and the reference angle vector differences are output to the mapping relation, and whether the received vector angle differences and the received reference angle vector differences meet the mapping relation is judged.
Further, the establishing a mapping relation based on the historical data of the vector angle difference and the reference vector angle difference includes:
and establishing a mapping relation based on the plurality of groups of historical vector angle differences and the historical reference vector angle differences at the same moment as the historical vector angle differences.
Specifically, the upper computer takes the historical vector angle difference and the historical reference angle vector difference as data sets respectively, performs multiple tests to calculate and obtain the mapping relation between the historical vector angle difference and the historical reference angle vector difference, and determines the polarity of the power transmission line based on whether the mapping relation f of the power supply and distribution system is satisfied by the vector angle difference and the reference angle difference obtained based on different vector testers and different power supply and distribution systems, and the mapping relation f can be specifically set according to actual conditions or can be a function if the data set of the historical reference angle difference is the data set, wherein f is the mapping relation between the historical vector angle difference and the historical reference angle vector difference, such that the vector angle difference of the current tested by the main vector tester is always equal to twice the reference vector angle difference of the current tested by the reference vector tester tested at the same moment.
And S3, judging the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system based on the mapping relation.
Specifically, based on a mapping relation stored by an upper computer, after receiving a vector angle difference and a reference vector angle difference, a calling instruction is output to the upper computer, the calling instruction comprises a calling command and the vector angle difference and the reference vector angle difference, the upper computer calls a corresponding mapping relation of a power supply and distribution system where the stored vector angle difference and the reference vector angle difference are located according to the calling instruction, and the direct output of the vector angle difference and the reference vector angle difference to the mapping relation is realized, so that the polarity of a power transmission line is judged according to whether the relation between the vector angle difference and the reference vector angle difference meets the mapping relation or not, the judged polarity is displayed on a display screen connected with the upper computer, and a worker is reminded of being connected according to the polarity of the power transmission line, and the judged polarity is also stored on the upper computer.
Further, the determining, based on the mapping relationship, the accuracy of the power supply and distribution system to determine the polarity of the power transmission line includes:
if the vector angle difference and the reference vector angle difference jointly meet the mapping relation, judging whether the polarity judgment of the power transmission line of the power supply and distribution system is accurate or not, and outputting the result.
In particular, in order to ensure the efficient operation of the power transmission line, the power supply and distribution system performs primary judgment of the polarity of the power transmission line, so as to improve the power transportation efficiency, if the vector angle difference and the reference vector angle difference jointly meet the mapping relation corresponding to the power supply and distribution system where the power transmission line is located, the polarity judgment of the power transmission line by the power supply and distribution system is determined to be accurate, otherwise, the power supply and distribution system is inaccurate, namely, if the mapping relation of the power supply and distribution system where the power transmission line is located is equal to twice the reference vector angle difference at the same moment, and all the vector angle differences in the power supply and distribution system are equal to twice the reference vector angle difference at the same moment, the polarity judgment of the power transmission line by the power supply and distribution system where the power transmission line is determined to be accurate, the result of the accuracy judgment of the polarity judgment of the power transmission line is output on a display screen according to the accuracy or inaccuracy is displayed, and the polarity of the current transformer is also recorded at the same time, the current circulation of the power transmission line after connection according to the polarity is observed, so that the correctness of the polarity of the power transmission line is determined, and the power transmission line is connected to the power supply and distribution system is ensured.
Further, the determining the polarity of the power transmission line of the power supply and distribution system based on the mapping relation includes:
if the mapping relation is not satisfied, counting the times of not satisfying the mapping relation, and if the times exceed a threshold value, reestablishing the mapping relation.
Specifically, the vector angle difference and the reference vector angle difference have the possibility of jointly meeting the mapping relation corresponding to the power supply and distribution system where the vector angle difference and the reference vector angle difference are located, the possibility of not meeting the mapping relation exists, the number of times of not meeting the mapping relation is counted, when the number of times is increased, the current circulation of the power transmission line after being connected according to the polarity is observed, so that the correctness of the polarity of the power transmission line is verified, a threshold value is set, the threshold value can be specifically set according to the actual situation, when the number of times exceeds the threshold value, the sensing test current is redetected based on the model numbers of the replacement current transformer and the reference current transformer, the vector angle difference and the reference vector angle difference are redeposited based on the detected vector angle difference and the reference vector angle difference, whether the redeposited mapping relation is identical to the mapping relation stored by an upper computer or not is judged, if the polarity of the judged power transmission line is not identical, the polarity of the power transmission line is verified to be stored and called by the redeposited mapping relation, and if the polarity of the power transmission line is not identical to exist, the polarity of the power supply and distribution system is stopped, the power supply and distribution system is arranged to work is stopped, and the power supply and distribution system is maintained, and the power distribution system is safely arranged.
The invention also provides a data vector testing system of the current transformer of the power supply and distribution system, as shown in figures 2-3, the testing system comprises:
the current acquisition module is used for acquiring an induced test current and a reference test current, and acquiring a vector angle difference and a reference vector angle difference based on the induced test current and the reference test current;
the relation building module is used for building a mapping relation based on historical data of the vector angle difference and the reference vector angle difference;
and the polarity judging module is used for judging the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system based on the mapping relation.
The current acquisition module is specifically configured to:
judging whether harmonic exists or not based on the induction test current, and if the harmonic exists, marking the induction test current.
The current acquisition module is further configured to:
and judging the current and the temperature of a power capacitor in the power supply and distribution system based on the harmonic wave to obtain marking data, and marking the induction test current based on the marking data.
The partial structure of the current acquisition module is as follows, the current acquisition module comprises a current transformer T1, one end of the current transformer T1 is connected with one end of a resistor R2, the other end of the resistor R2 is respectively connected with one end of a resistor R14 and one end of a resistor R12, the other end of the resistor R14 is connected with a 1 pin of a multiplier V1, a 2 pin of the multiplier V1 is connected with one end of a resistor R13, the other end of the resistor R13 is connected with a first signal, the output end of the multiplier V1 is connected with one end of a resistor R6, the other end of the resistor R6 is respectively connected with one end of a capacitor C3 and one end of a resistor R11, the other end of the resistor R11 is connected with the same-phase end of an operational amplifier U3B, the reverse-phase end of the operational amplifier U3B is connected with one end of a resistor R7 and one end of a resistor R1, the output end of the operational amplifier U3B is respectively connected with one end of a resistor R8 and the other end of the resistor R1, the other end of the resistor R8 is respectively connected with one end of a capacitor C4 and the base of a triode Q2, the emitter of the triode Q2 is connected with one end of a resistor R10, the collector of the triode Q2 is respectively connected with one end of a resistor R3 and the positive electrode of a diode D2, the other end of the resistor R3 is connected with a positive polarity power supply VCC, the negative electrode of the diode D2 is respectively connected with one end of a capacitor C1, the control electrode of a thyristor Q4 and the control electrode of the thyristor Q1, the anode of the thyristor Q4 is connected with a current signal, the cathode of the thyristor Q4 is connected with one end of a resistor R5, the other end of the resistor R5 is respectively connected with one end of a resistor R4 and the same phase end of an operational amplifier U4B, the opposite phase end of the operational amplifier U4B is respectively connected with the other end of the resistor R9, one end of a capacitor C5 and one end of a resistor R15, the output end of the operational amplifier U4B is respectively connected with the other end of the resistor R15 and the negative electrode of a voltage stabilizing tube D4, the positive electrode of the voltage stabilizing tube D4 is connected with the 2 pin of an AND gate U3A, the output end of the AND gate U3A is connected with an upper computer, the 1 pin of the AND gate U3A is connected with the negative electrode of the diode D1, the positive pole of diode D1 is connected with the output of AND gate U1A, the 1 pin of AND gate U1A connects the one end of resistance R16 respectively, the one end of electric capacity C2, the one end of relay K1, the other end of resistance R16 connects the 3 pin of switch S1, the 1 pin of switch S1 connects AND gate U1A' S2 pin, the 2 pin of switch S1 connects the negative pole of diode D3, the positive pole of diode D3 connects the output of fortune amplifier U2B respectively, the one end of resistance R17 respectively, the inverting terminal of fortune amplifier U2B connects the one end of electric capacity C6 respectively, the other end of resistance R17, the one end of resistance R18 respectively, the homophase end of fortune amplifier U2B connects the one end of resistance R19 respectively, the one end of resistance R20, the other end of resistance R18 respectively, the negative pole of thyristor Q1, the positive pole of thyristor Q1 connects temperature signal, the other end of resistance C6 connects the other end of resistance R20 respectively, the other end of electric capacity C5, the other end of electric capacity C1, the other end of resistance R4, the other end of resistance R10, the other end of resistance C7, the other end of resistance C3, the other end of resistance C1 and the other end of resistance C1, the other end of resistance C2 and the other end of resistance C1, the mutual inductor.
The relationship establishing module is specifically configured to:
and establishing a mapping relation based on the plurality of groups of historical vector angle differences and the historical reference vector angles at the same moment as the historical vector angle differences.
The polarity judging module is specifically configured to:
if the vector angle difference and the reference vector angle difference jointly meet the mapping relation, judging whether the polarity judgment of the power transmission line of the power supply and distribution system is accurate or not, and outputting the result.
The polarity judging module is further configured to:
if the mapping relation is not satisfied, counting the times of not satisfying the mapping relation, and if the times exceed a threshold value, reestablishing the mapping relation.
The data vector testing system for the current transformer of the power supply and distribution system can achieve the processes of the data vector testing method for the current transformer of the power supply and distribution system, and can achieve the same technical effects, so that repetition is avoided, and repeated description is omitted.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A data vector testing method for a current transformer of a power supply and distribution system is characterized by comprising the following steps of: the test method comprises the following steps:
acquiring an induced test current and a reference test current, and acquiring a vector angle difference and a reference vector angle difference based on the induced test current and the reference test current;
establishing a mapping relation based on historical data of the vector angle difference and the reference vector angle difference;
judging the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system based on the mapping relation;
the specific vector angle difference calculation mode is as follows: the magnitude and phase angle of the induction test current or the reference test current and the preset threshold current are expressed in a complex form, then the phase angle difference between the induction test current and the threshold current and the phase angle difference between the reference test current and the preset threshold current are calculated respectively, the phase angle difference is normalized, and finally the vector angle difference and the reference vector angle difference are obtained respectively based on the normalized phase angle difference divided by 2 pi and multiplied by a calculation mode of 360 degrees;
the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system is judged based on the mapping relation, and the method comprises the following steps:
judging whether the polarity judgment of the power transmission line of the power supply and distribution system is accurate or not according to whether the vector angle difference and the reference vector angle difference jointly meet the mapping relation established based on the historical data of the vector angle difference and the reference vector angle difference, and outputting the result;
the establishing a mapping relation based on the historical data of the vector angle difference and the reference vector angle difference comprises the following steps:
and establishing a mapping relation based on the plurality of groups of historical vector angle differences and the historical reference vector angle differences at the same moment as the historical vector angle differences.
2. The method for testing the data vector of the current transformer of the power supply and distribution system according to claim 1, wherein the method comprises the following steps of: the obtaining the induced test current and the reference test current includes:
judging whether harmonic exists or not based on the induction test current, and if the harmonic exists, marking the induction test current.
3. The method for testing the data vector of the current transformer of the power supply and distribution system according to claim 2, wherein the method comprises the following steps of: the step of marking the induced test current comprises the following steps:
and judging the current and the temperature of a power capacitor in the power supply and distribution system based on the harmonic wave to obtain marking data, and marking the induction test current based on the marking data.
4. The method for testing the data vector of the current transformer of the power supply and distribution system according to claim 1, wherein the determining the accuracy of the polarity determination of the power transmission line by the power supply and distribution system based on the mapping relation comprises:
if the mapping relation is not satisfied, counting the times of not satisfying the mapping relation, and if the times exceed a threshold value, reestablishing the mapping relation.
5. A power supply and distribution system current transformer data vector test system is characterized in that: the test system includes:
the current acquisition module is used for acquiring an induced test current and a reference test current, and acquiring a vector angle difference and a reference vector angle difference based on the induced test current and the reference test current;
the relation building module is used for building a mapping relation based on historical data of the vector angle difference and the reference vector angle difference;
the polarity judging module is used for judging the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system based on the mapping relation;
the specific vector angle difference calculation mode is as follows: the magnitude and phase angle of the induction test current or the reference test current and the preset threshold current are expressed in a complex form, then the phase angle difference between the induction test current and the threshold current and the phase angle difference between the reference test current and the preset threshold current are calculated respectively, the phase angle difference is normalized, and finally the vector angle difference and the reference vector angle difference are obtained respectively based on the normalized phase angle difference divided by 2 pi and multiplied by a calculation mode of 360 degrees;
the accuracy of the polarity judgment of the power transmission line by the power supply and distribution system is judged based on the mapping relation, and the method comprises the following steps:
judging whether the polarity judgment of the power transmission line of the power supply and distribution system is accurate or not according to whether the vector angle difference and the reference vector angle difference jointly meet the mapping relation established based on the historical data of the vector angle difference and the reference vector angle difference, and outputting the result;
the establishing a mapping relation based on the historical data of the vector angle difference and the reference vector angle difference comprises the following steps:
and establishing a mapping relation based on the plurality of groups of historical vector angle differences and the historical reference vector angle differences at the same moment as the historical vector angle differences.
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