CN113484804B - Wrong wiring identification method applied to feeder terminal device - Google Patents
Wrong wiring identification method applied to feeder terminal device Download PDFInfo
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- CN113484804B CN113484804B CN202110616396.2A CN202110616396A CN113484804B CN 113484804 B CN113484804 B CN 113484804B CN 202110616396 A CN202110616396 A CN 202110616396A CN 113484804 B CN113484804 B CN 113484804B
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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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a method for identifying a wrong wiring applied to a feeder terminal device, which comprises the following steps: acquiring line voltage and phase current data acquired by an FTU (fiber to the touch) and determining a voltage phase sequence; measuring U respectively 1 ，U 2 ，U 3 With reference voltage U b Determining U b Determining voltage phases by combining the voltage phase sequences; calculation I 1 ，I 2 ，I 3 And U a ，‑U c ，U b ，‑U a ，U c ，‑U b Obtaining a matrix 1 from the angles of (a); enumerating all possible wiring cases to obtain a matrix 2; traversing the matrix 2, calculating the sum of absolute values of 3 angles in the matrix 1 corresponding to each item to obtain a matrix 3, and solving the minimum value of elements in the matrix; the current phase is determined from the evaluated values and gives the confidence. The invention enumerates all possible wiring modes of the current transformer, calculates the three-phase power factor angle sum under different modes, selects the current phase corresponding to the minimum value with highest reliability in the sum value as a judgment result, and realizes accurate identification of wrong wiring. The method can rapidly give out the voltage and current phase judgment result and the reliability, is not limited by the angle of the power factor, and has strong engineering practicability.
Description
Technical Field
The invention relates to the technical field of power distribution and utilization, in particular to a wrong wiring identification method applied to a feeder terminal device.
Background
The feeder terminal device has the functions of remote control, remote measurement, remote signaling, fault detection and the like, can be communicated with a power distribution automation main station, provides information required by the running condition, various parameters and monitoring control of a power distribution system, executes commands issued by the power distribution main station, adjusts and controls power distribution equipment, realizes fault positioning, isolation, rapid recovery of power supply of non-fault sections and the like, and ensures normal operation of a power grid. However, due to complex actual scene conditions, the constructors have uneven capacities, and sometimes the situation that the feeder terminal device is in misconnection with the line of the voltage transformer or the current transformer often occurs, the former is easy to identify and correct, while the latter can be quickly identified and corrected by a hexagonal graph method when the on-site power factor angle is smaller, but when the power factor angle of a one-phase or multi-phase line is larger than 30 degrees, due to multiple solutions, the misconnection situation is often difficult to directly confirm.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a fault wiring identification method applied to a feeder terminal device, which calculates the sum of three-phase power factor angles under different wiring modes by listing all possible wiring modes of a current transformer, selects the current phase corresponding to the minimum value with the highest reliability level in the sum as a judgment result, and realizes the accurate identification of fault wiring.
The aim of the invention can be achieved by the following technical scheme:
a method for identifying a wrong wiring applied to a feeder terminal device comprises the following steps:
step 1: acquiring two line voltages U acquired by a feeder terminal device 12 ，U 32 Three phase currents I 1 ，I 2 ，I 3 Waveform data of (2) calculation
Determining a voltage phase sequence;
step 2: measuring U respectively 1 ，U 2 ，U 3 With reference voltage U b The voltage with the measured value of 0 is U b Determining voltage phases by combining the voltage phase sequences;
step 3: respectively calculate I 1 ，I 2 ，I 3 And U a ，-U c ，U b ，-U a ，U c ，-U b Obtaining a matrix 1;
step 4: enumerating all possible wiring conditions to obtain a matrix 2;
step 5: traversing the matrix 2, calculating the sum of absolute values of 3 angles in the matrix 1 corresponding to each item to obtain a matrix 3, and solving the minimum value of the elements in the matrix 3;
step 6: the current phase is determined from the minimum value calculated and gives the confidence level.
Further, in the step 1
To extract U by DFT method 12 And U 32 The power frequency phase of the power frequency is converted into an angle value, and then the angle value is obtained by subtracting the power frequency phase from the power frequency phase of the power frequency; if->
Or->
The voltage is a positive phase sequence; if->
Or->
The voltages are in reverse order.
Further, the positive voltage phase sequence includes ABC, BCA, CAB and the negative voltage phase sequence includes ACB, CBA, BAC.
Further, the specific calculation process in the step 3 is as follows: first calculate I 1 、I 2 、I 3 And U a Then calculates U according to the hexagonal diagram a 、-U c 、U b 、-U a 、U c 、-U b And U a At least one of the angles of (1) and (I) 1 、I 2 、I 3 and-U c 、U b 、-U a 、U c 、-U b The angle of (2) gives a matrix 1 with dimensions (3, 6) as follows:
each column in the matrix represents a different current phase, a, -C, B, -A, C, -B in turn.
Further, in the step 3, when the angle between the current and the voltage of a certain phase is not within the theoretical range of the power factor angle [ -90 °,90 ° ], the angle value is set to + -infinity.
Further, the dimensions of the matrix 2 in the step 4 are (6, 8), which are specifically as follows:
the 3 elements of each entry in matrix 2 are the indices of the corresponding columns of the three rows in matrix 1, respectively.
Further, a plurality of minima may be generated in the solving of the matrix 3 in the step 5.
Further, in the step 6, the current phase reliability is divided into four levels of high, low and low; if only one minimum value exists, selecting the corresponding current phase and giving out the corresponding credibility level; if a plurality of minimum values exist, selecting the current phase corresponding to the minimum value with the highest reliability level; if the confidence levels of the multiple minimum values are the same, a multiple solution is given.
Further, the credibility grading principle is as follows:
condition 1: solving the matrix 3 to obtain a certain minimum value smaller than 90 degrees;
condition 2: the absolute values of the 3 angles in the matrix 1 corresponding to the minimum value are all smaller than 30 degrees;
condition 3: 2 or more absolute values of 3 angles in the matrix 1 corresponding to the minimum value are smaller than or equal to 20 degrees;
if all the 3 conditions are met, the corresponding current is very high in reliability;
if only conditions 1 and 2 or conditions 1 and 3 are met, the reliability is higher;
if a certain minimum value obtained by solving the matrix 3 is more than or equal to 90 degrees, and 2 or more absolute values of the minimum value corresponding to 3 angles in the matrix 1 are more than or equal to 30 degrees, the corresponding current phase has very low reliability;
the other cases correspond to a lower current phase reliability.
The beneficial effects of the invention are as follows: by enumerating all possible wiring modes of the current transformer, calculating the sum of three-phase power factor angles under different wiring modes, selecting the current phase corresponding to the minimum value with the highest reliability level in the sum as a judgment result, and realizing the accurate identification of wrong wiring. The method can rapidly give out the voltage and current phase judgment result and the reliability, is not limited by the angle of the power factor, and has strong engineering practicability.
Drawings
Fig. 1 is a general flow chart of the present invention.
Fig. 2 is a hexagonal diagram corresponding to embodiment 1 of the present invention.
Fig. 3 is a hexagonal diagram corresponding to embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1.
Referring to fig. 1, a method for identifying a wrong connection wire applied to a feeder terminal device includes the following steps:
step 1: acquiring two line voltages U acquired by a feeder terminal device 12 And U 32 Three phase currents I 1 、I 2 、I 3 Extracting U with DFT 12 The power frequency phase of (2) is converted into an angle value of 30 DEG, and U is extracted 32 The power frequency phase of (2) is converted into an angle value of 90 degrees,
the voltage is a positive phase sequence;
step 2: measuring U respectively 1 ，U 2 ，U 3 With a known reference voltage U b Wherein U is 2 -U b =0, so U 2 Is U (U) b The voltage phase is determined to be ABC because the voltage is in positive phase sequence;
step 3: as shown in FIG. 2, extracting I with DFT 1 ，I 2 ，I 3 The power frequency phase of (2) is converted into angle values of-10 DEG, -110 DEG, and-140 DEG respectively, namely, the angle values are equal to U a The angles of (a) are-10 degrees, -110 degrees, 140 degrees and U respectively a ，-U c ，U b ，-U a ，U c ，-U b And U a The angles of (1) are respectively 0 DEG, -60 DEG, -120 DEG, -180 DEG, -120 DEG, 60 DEG, and I is calculated respectively 1 ，I 2 ，I 3 and-U c ，U b ，-U a ，U c ，-U b To obtain a matrix 1, if the angle value in the matrix 1 is not within [ -90 DEG, 90 DEG]In the range, the temperature is directly set to + -infinity, the end result of matrix 1 is as follows:
step 4: enumerating all possible wiring cases, a matrix 2 is obtained as follows:
in row 1, column 8 element [1,6, 5]]To illustrate the meaning of the elements in matrix 2, 1 represents the 1 st row and 1 st column elements in matrix 1,6 represents the 2 nd row and 6 th column elements in matrix 1, and 5 represents the 3 rd row and 5 th column elements in matrix 1, the wiring mode is I 1 Corresponding I A 、I 2 corresponding-I B 、I 3 Corresponding I C I.e. the current phase is a-BC;
step 5: traversing the matrix 2, and calculating the sum of absolute values of 3 angles in the matrix 1 corresponding to each term to obtain a matrix 3 as follows:
taking the element 40 DEG of the 1 st row and the 5 th column as an illustration of the element calculation method in the matrix 3, and the element 5 of the 1 st row and the 5 th column in the matrix 2 is [1,3,5], the absolute value of the 1 st row and the 1 st column in the matrix 1 is-10 DEG, and the absolute value of the 10 DEG of the 2 rd row and the 3 rd column and the absolute value of the 20 DEG of the 3 rd row and the 5 th column are added to obtain 40 deg.
The minimum value of the elements in the matrix 3 is calculated to be 40 degrees;
step 6: the minimum value 40 degrees in the matrix 3 is smaller than 90 degrees, the absolute value of the corresponding 3 angles in the matrix 1 is 10 degrees, 10 degrees and 20 degrees are all smaller than 30 degrees, and two or more angles are smaller than or equal to 20 degrees, so that the corresponding current phase ABC has high reliability. In this case, the voltage phase is ABC and the current phase is ABC, i.e. both are correctly wired without correction.
Example 2.
Referring to fig. 1, a method for identifying a wrong connection wire applied to a feeder terminal device includes the following steps:
step 1: acquiring two line voltages U acquired by a feeder terminal device 12 And U 32 Three phase currents I 1 、I 2 、I 3 Extracting U with DFT 12 The power frequency phase of (2) is converted into an angle value of-150 DEG, and U is extracted 32 The power frequency phase of (2) is converted into an angle value of 150 degrees,
the voltage is in reverse phase sequence;
step 2: measuring U respectively 1 ，U 2 ，U 3 With a known reference voltage U b Wherein U is 1 -U b =0, so U 1 Is U (U) b Since the voltage is in the reverse phase sequence, the voltage phase is determined as BAC;
step 3: as shown in FIG. 3, extracting I with DFT 1 ，I 2 ，I 3 And converted into angle values of-5, -70, -166, respectively, i.e. they are parallel to U a The angles of (a) are-5 degrees, -70 degrees, 166 degrees and U is respectively as follows a ，-U c ，U b ，-U a ，U c ，-U b And U a The angles of (1) are respectively 0 DEG, -60 DEG, -120 DEG, -180 DEG, -120 DEG, 60 DEG, and I is calculated respectively 1 ，I 2 ，I 3 and-U c ，U b ，-U a ，U c ，-U b To obtain a matrix 1, if the angle value in the matrix 1 is not within [ -90 DEG, 90 DEG]In the range, the temperature is directly set to + -infinity, the end result of matrix 1 is as follows:
step 4: enumerating all possible wiring cases, a matrix 2 is obtained as follows:
step 5: traversing the matrix 2, and calculating the sum of absolute values of 3 angles in the matrix 1 corresponding to each term to obtain a matrix 3 as follows:
obtaining the minimum value of the elements in the matrix 3 to be 61 degrees;
step 6: the minimum value 61 DEG in the matrix 3 is smaller than 90 DEG, the absolute value of 3 angles in the corresponding matrix 1 is 5 DEG, 10 DEG, and more than two of 46 DEG are smaller than or equal to 20 DEG, so the corresponding current phase A-CB has higher reliability. The voltage phase is BAC, the current phase is A-CB, the voltage transformer and the current transformer are all in error connection, the correction is needed, and the correction mode is as follows: u is set to 1 And U 2 Exchange, I 2 And I 3 To exchange, at the same time I 2 The polarity of the inner part is reversed and the polarity is required to be changed.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.
Claims (7)
1. The method for identifying the wrong wiring applied to the feeder terminal device is characterized by comprising the following steps of:
step 1: acquiring two line voltages U acquired by a feeder terminal device 12 ，U 32 Three phase currents I 1 ，I 2 ，I 3 Waveform data of (2) calculation
Determining a voltage phase sequence;
step 2: measuring U respectively 1 ，U 2 ，U 3 With reference voltage U b The voltage with the measured value of 0 is U b Determining voltage phases by combining the voltage phase sequences;
step 3: respectively calculate I 1 ，I 2 ，I 3 And U a ，-U c ，U b ，-U a ，U c ，-U b Obtaining a matrix 1;
step 4: enumerating all possible wiring conditions to obtain a matrix 2;
step 5: traversing the matrix 2, calculating the sum of absolute values of 3 angles in the matrix 1 corresponding to each item to obtain a matrix 3, and solving the minimum value of the elements in the matrix 3;
step 6: determining the current phase according to the minimum value and giving the credibility; specifically:
the current phase reliability is divided into four levels of high, low and low; if only one minimum value exists, selecting the corresponding current phase and giving out the corresponding credibility level; if a plurality of minimum values exist, selecting the current phase corresponding to the minimum value with the highest reliability level; if the credibility levels of the minimum values are the same, a multi-solution is given;
the credibility grading principle is as follows:
condition 1: solving the matrix 3 to obtain a certain minimum value smaller than 90 degrees;
condition 2: the absolute values of the 3 angles in the matrix 1 corresponding to the minimum value are all smaller than 30 degrees;
condition 3: 2 or more absolute values of 3 angles in the matrix 1 corresponding to the minimum value are smaller than or equal to 20 degrees;
if all the 3 conditions are met, the corresponding current is very high in reliability;
if only conditions 1 and 2 or conditions 1 and 3 are met, the reliability is higher;
if a certain minimum value obtained by solving the matrix 3 is more than or equal to 90 degrees, and 2 or more absolute values of the minimum value corresponding to 3 angles in the matrix 1 are more than or equal to 30 degrees, the corresponding current phase has very low reliability;
the other cases correspond to a lower current phase reliability.
2. The method for identifying a wrong wiring applied to a feeder terminal device according to claim 1, wherein in step 1
To extract U by DFT method 12 And U 32 The power frequency phase of the power frequency is converted into an angle value, and then the angle value is obtained by subtracting the power frequency phase from the power frequency phase of the power frequency; if->
Or->
The voltage is a positive phase sequence; if->
Or->
The voltages are in reverse order.
3. A method of identifying a misconnection applied to a feeder terminal device according to claim 2, wherein the positive voltage sequence comprises ABC, BCA, CAB and the negative voltage sequence comprises ACB, CBA, BAC.
4. The method for identifying the wrong wiring applied to the feeder terminal device according to claim 1, wherein the specific calculation process in the step 3 is as follows: first calculate I 1 、I 2 、I 3 And U a Then calculates U according to the hexagonal diagram a 、-U c 、U b 、-U a 、U c 、-U b And U a At least one of the angles of (1) and (I) 1 、I 2 、I 3 and-U c 、U b 、-U a 、U c 、-U b The angle of (2) gives a matrix 1 with dimensions (3, 6) as follows:
each column in the matrix represents a different current phase, a, -C, B, -A, C, -B in turn.
5. A misconnection identification method for a feeder terminal device as claimed in claim 1, wherein, in the step 3, when the angle between the current and the voltage of a certain phase is not within the theoretical range of the power factor angle [ -90 DEG, 90 DEG], the angle value is set to + -infinity.
6. The method for identifying the wrong wiring applied to the feeder terminal device according to claim 1, wherein the dimensions of the matrix 2 in the step 4 are (6, 8), specifically:
the 3 elements of each entry in matrix 2 are the indices of the corresponding columns of the three rows in matrix 1, respectively.
7. A method of identifying a misconnection applied to a feeder terminal device according to claim 1, wherein a plurality of minima are likely to occur in the solving of the matrix 3 in step 5.
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| CN116699505A (en) * | 2023-08-04 | 2023-09-05 | 青岛鼎信通讯股份有限公司 | Electric energy meter wrong wiring judging method based on electricity utilization inspection instrument |
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