CN108008232B - Secondary current loop detection method and device - Google Patents
Secondary current loop detection method and device Download PDFInfo
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Abstract
The invention discloses a secondary current loop detection method, a device, electronic equipment and a computer readable storage medium, which mainly comprises the steps of obtaining data of a secondary current loop; the data comprises vector angles of the high-voltage side phase currents and the low-voltage side phase currents of the transformer; selecting one phase current of the high-voltage side phase currents as a reference current; judging whether the current data of each phase at the high-voltage side is correct or not according to the reference current; if the phase current data of each phase of the high-voltage side is incorrect, the judgment of outputting the high-voltage side data fails, the problem that the wiring correctness of a relay protection circuit of a conventional transformer can be judged only through converted measured values by acquiring various measured values and parameters of the conventional transformer in the prior art and the steps are complex is solved, and the steps for detecting the wiring correctness of the relay protection current loop of the transformer are simple.
Description
Technical Field
The invention relates to the field of transformer wiring detection, in particular to a secondary current loop detection method, a secondary current loop detection device, electronic equipment and a computer readable storage medium.
Background
The secondary direction measurement of the relay protection mainly utilizes a phase meter to measure a vector included angle of working voltage and load current, combines the load condition of primary equipment to carry out vector analysis, judges the running condition of the equipment, verifies the correctness of a secondary current loop, reflects the load trend direction and further ensures the correctness of protection actions.
The secondary vector measurement can ensure the correctness of the protection action and plays an important role in the safe operation of relay protection. The commissioning equipment has differential protection, distance, zero sequence and other directional protection, and protection of a current transformer or line replacement after returning to a factory for maintenance, in short, as long as the work related to Current Transformer (CT) replacement, protection device replacement or current loop modification needs to carry out secondary vector measurement during power transmission, otherwise protection misoperation or refusal can be caused, and great threat is brought to safe and stable operation of a power grid.
In the prior art, chinese patent publication No. CN101788630B discloses a method for analyzing connection of a relay protection circuit of a conventional transformer in a power system, which includes the following steps: 1) acquiring a measured value and parameters of a differential protection circuit of a conventional transformer; 2) converting the measured value of the differential protection circuit of the conventional transformer according to the parameters of the conventional transformer; 3) judging the wiring correctness of each winding according to the converted differential protection of the conventional transformer; 4) performing first correction and judging; 5) carrying out second judgment and carrying out judgment; 6) generating a corrected current effective value and storing a correction value when a correctness condition is met; 7) and outputting an analysis result. However, in the technical scheme, the wiring correctness of the relay protection circuit of the conventional transformer can be judged only through the converted measured values by acquiring various measured values and parameters of the conventional transformer, and the steps are complex.
Therefore, how to solve the problem that the steps of the conventional method for analyzing the wiring of the relay protection circuit of the transformer in the prior art are complicated, and providing a simple method for detecting the wiring correctness of the relay protection current loop of the transformer is urgent to solve.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to solve the problem that the wiring analysis method of the conventional transformer relay protection circuit in the prior art has complicated steps.
To this end, according to a first aspect, an embodiment of the present invention provides a secondary current loop detection method, which is characterized by including the following steps: acquiring data of a secondary current loop; the data comprises vector angles of the high-voltage side phase currents and the low-voltage side phase currents of the transformer; selecting one phase current of the high-voltage side phase currents as a reference current; judging whether the current data of each phase at the high-voltage side is correct or not according to the reference current; and if the current data of each phase on the high-voltage side is incorrect, outputting the data on the high-voltage side to fail to judge.
Optionally, the secondary current loop detection method further includes: if the current data of each phase on the high-voltage side is correct, judging whether the current data of each phase on the low-voltage side is correct or not according to the current data of each phase on the high-voltage side; if the current data of each phase of the low-voltage side is incorrect, outputting the data of the low-voltage side to fail to judge; and if the current data of each phase on the low-voltage side is correct, outputting a detection result.
Optionally, before selecting one of the high-side phase currents as the reference current, the method further includes: judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not; and if the data of the high-voltage side current and the data of the low-voltage side current are abnormal, the output and input data are abnormal.
Optionally, the judging the correctness of the current data of each phase at the high-voltage side according to the reference current comprises: judging whether the vector angle difference between the currents of the high-voltage side phases is 120 +/-10 degrees or not; if the vector angle between the high-side phase currents differs by 120 + -10 degrees, the high-side current data is correct.
Optionally, the judging the correctness of the current data of each phase at the high-voltage side according to the reference current further comprises: if the vector angle between the high-voltage side phase currents is not 120 +/-10 degrees, inverting one phase or two phases of the high-voltage side phase currents except the reference current; judging whether the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees or not; if the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees, the current data of the high-voltage side is correct; if the vector angle between the high-side phase currents is not 120 + -10 degrees, the high-side phase current data is incorrect.
Optionally, the wiring mode of the secondary current loop is YY connection; if the high-voltage side current data of each phase is correct, judging the correctness of the low-voltage side current data of each phase according to the high-voltage side current data of each phase comprises the following steps: corresponding each phase current of the high-voltage side to each phase current of the low-voltage side one by one; judging whether the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the corresponding low-voltage side have a difference of 180 +/-10 degrees or not; if the vector angle of each phase current of the high-voltage side is 180 +/-10 degrees different from the vector angle of each phase current of the corresponding low-voltage side, the data of each phase current of the low-voltage side is correct; if the vector angle of each phase current on the high-voltage side is different from the vector angle of each phase current on the corresponding low-voltage side by 180 +/-10 degrees, inverting one phase or multiple phases in each phase current on the corresponding low-voltage side; judging whether the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the low-voltage side after corresponding phase inversion have a difference of 180 +/-10 degrees or not; if the vector angle of each phase current of the high-voltage side is 180 +/-10 degrees different from the vector angle of each phase current of the low-voltage side after corresponding phase inversion, the data of each phase current of the low-voltage side is correct; if the difference between the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the low-voltage side after corresponding phase inversion is not 180 +/-10 degrees, judging whether the corresponding relation between all the phase currents of the high-voltage side and the phase currents of the low-voltage side is judged; if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is not judged, changing the corresponding relation between the high-voltage side phase currents and the low-voltage side phase currents, and repeating the judging step; and if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged, the low-voltage side phase currents have incorrect data.
Optionally, the secondary current loop is connected in a manner of YD11 connection; if the high-voltage side current data of each phase is correct, judging the correctness of the low-voltage side current data of each phase according to the high-voltage side current data of each phase comprises the following steps: corresponding each phase current of the high-voltage side to each phase current of the low-voltage side one by one; judging whether each phase current of the high-voltage side leads the corresponding each phase current of the low-voltage side by 150 +/-10 degrees or lags by 210 +/-10 degrees; if the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees or lags by 210 +/-10 degrees, the low-voltage side phase current data is correct; if the high-voltage side phase current is not advanced by 150 +/-10 degrees or lagged by 210 +/-10 degrees than the corresponding low-voltage side phase current, inverting one phase or multiple phases in the corresponding low-voltage side phase current; judging whether each phase current of the high-voltage side leads by 150 +/-10 degrees or lags by 210 +/-10 degrees compared with each phase current of the low-voltage side after corresponding phase inversion; if the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees after phase inversion or lags by 210 +/-10 degrees, the low-voltage side phase current data is correct; if the high-voltage side phase current is not advanced by 150 +/-10 degrees or lagged by 210 +/-10 degrees compared with the corresponding low-voltage side phase current after phase inversion, judging whether the corresponding relation between all high-voltage side phase currents and all low-voltage side phase currents is judged; if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is not judged, changing the corresponding relation between the high-voltage side phase currents and the low-voltage side phase currents, and repeating the judging step; and if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged, the low-voltage side phase currents have incorrect data.
Optionally, the detection result includes: a vector angle of the reference current; vector angles of all phase currents on the high-voltage side and whether the phase is reversed or not; the vector angle of each phase current on the low-voltage side and whether the phase is reversed or not; the corresponding relation between each phase current at the high-voltage side and each phase current at the low-voltage side; and/or, a load property map of the reference current; and/or a vector diagram of the high-side phase current and the low-side phase current.
According to a second aspect, an embodiment of the present invention further provides a secondary current loop detection apparatus, including: the input module is used for acquiring data of a secondary current loop, wherein the data comprises a vector angle of each phase current on a high-voltage side and a vector angle of each phase current on a low-voltage side; the selection module is used for selecting one phase current of the high-voltage side phase currents as a reference current; the high-voltage side judgment module is used for judging whether the current data of each phase at the high-voltage side is correct or not according to the reference current; the first output module is used for outputting the data on the high-voltage side to judge failure; the low-voltage side judgment module is used for judging whether the current data of each phase at the low-voltage side is correct or not according to the current data of each phase at the high-voltage side; the second output module is used for outputting the data at the low-voltage side to judge failure; and the third output module is used for outputting the detection result.
Optionally, the secondary current loop detection device further includes: the abnormality judgment unit is used for judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not; and the fourth output unit is used for outputting the input data with abnormity.
Optionally, the high pressure side determining module includes: the first judging unit is used for judging whether the vector angle between the currents of the high-voltage side phases is different by 120 +/-10 degrees; a first adjustment unit for inverting one phase or two phases of each phase current of the high-voltage side other than the reference current; and the second judging unit is used for judging whether the vector angle between the phase currents of the high-voltage side after phase inversion is different from 120 +/-10 degrees.
Optionally, the wiring mode of the secondary current loop is YY connection; the low pressure side judgment module includes: the setting unit is used for corresponding the high-voltage side phase current and the low-voltage side phase current one by one; the third judging unit is used for judging whether the vector angle of each phase current on the high-voltage side and the vector angle of each phase current on the corresponding low-voltage side are different by 180 +/-10 degrees or not; the second adjusting unit is used for inverting one phase or multiple phases in the corresponding low-voltage side phase current; the fourth judging unit is used for judging whether the vector angle of each phase current on the high-voltage side and the vector angle of each phase current on the corresponding low-voltage side after phase inversion are different by 180 +/-10 degrees or not; and the first circulating unit is used for changing the corresponding relation between the high-voltage side phase current and the low-voltage side phase current and judging whether the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged.
According to a third aspect, an embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the processor, and the instructions are executed by the at least one processor to cause the at least one processor to perform all or part of the processes of the secondary current loop detection method.
According to a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, wherein the processor is configured to execute the computer program stored in the storage medium to implement all or part of the processes in the secondary current loop detection method.
The technical scheme provided by the embodiment of the invention has the following advantages:
1. the secondary current loop detection method provided by the invention comprises the steps of acquiring data of a secondary current loop; the data comprises vector angles of the high-voltage side phase currents and the low-voltage side phase currents of the transformer; selecting one phase current of the high-voltage side phase currents as a reference current; the method has the advantages that whether the current data of each phase of the high-voltage side are correct or not is judged according to the reference current, the problem that the wiring correctness of a relay protection circuit of a conventional transformer can be judged only through converted data by acquiring various measured values and parameters of the conventional transformer in the prior art and the steps are complex is solved, and the steps for detecting the wiring correctness of the relay protection current circuit of the transformer are simple.
2. The secondary current loop detection method provided by the invention further comprises the following steps: judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not; and if the data of the high-voltage side current and the data of the low-voltage side current are abnormal, the output and input data are abnormal. By selecting one phase of the high-voltage side phase currents as a reference current and judging whether the acquired input data is abnormal or not before judging the correctness of the high-voltage side phase currents, the problem possibly occurring in data measurement can be found in time, the error of a detection result caused by the abnormal data is prevented, and the detection accuracy of the secondary current loop detection method is improved.
3. According to the secondary current loop detection method provided by the invention, the wiring mode of the secondary loop is YY connection or YD11 connection, so that the wiring correctness of the relay protection current loop with two wiring modes of YY connection and YD11 connection can be directly judged, and the application range of the secondary current loop detection method is expanded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a secondary current loop detection method provided in this embodiment;
fig. 2 is a flowchart for determining whether current data of each phase on the high-voltage side is correct according to a reference current according to the present embodiment;
fig. 3 is a flowchart for determining whether the current data of each phase on the low voltage side is correct according to the current data of each phase on the high voltage side according to the embodiment;
fig. 4 is another flowchart for determining whether the current data of each phase on the low-voltage side is correct according to the current data of each phase on the high-voltage side according to the present embodiment;
fig. 5 is a schematic structural diagram of a secondary current loop detection device provided in this embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
The present embodiment provides a method for detecting a secondary current loop, please refer to fig. 1, which includes the following steps:
step S100, data of the secondary current loop is acquired. In the present embodiment, the data includes a vector angle of each phase current on the high-voltage side and a vector angle of each phase current on the low-voltage side of the transformer. In a specific embodiment, the vector angle of each phase current on the high-voltage side and the vector angle of each phase current on the low-voltage side of the transformer are measured by an ammeter, the high-voltage side of the transformer comprises three-phase currents, the vector angles of the three-phase currents are I, II and III respectively, and the low-voltage side of the transformer comprises three-phase currents, the vector angles of the three-phase currents are 1, 2 and 3 respectively.
In step S200, one of the high-side phase currents is selected as a reference current. In this embodiment, any one of the phases I, II, and III is selected as a reference, and is denoted as an a phase, and the remaining two phases are denoted as a B phase and a C phase, specifically, I is selected as a reference current, and II and III are denoted as a B phase and a C phase, respectively. It should be noted that the above-mentioned selection manner is only a specific example for facilitating the understanding of the solution of the present embodiment by those skilled in the art, and should not be construed as a limitation to the technical solution of the present embodiment.
And step S300, judging whether the current data of each phase at the high-voltage side is correct or not according to the reference current. If the high-side phase current data is not correct, step S400 is performed. In this embodiment, it is determined whether the current data of each phase on the high-voltage side is correct by determining whether the difference between the vector angles of the phase B and phase C currents with respect to the vector angle of the reference current a matches a preset value. In a particular embodiment, the vector angles of phase B and phase C currents differ by 120 degrees and 240 degrees, or 240 degrees and 120 degrees, respectively, relative to the vector angle of reference current a.
And step S400, outputting the high-pressure side data, and judging failure.
The method for detecting the secondary current loop solves the problem that the wiring correctness of the relay protection circuit of the conventional transformer can be judged only through the converted measured values by acquiring various measured values and parameters of the conventional transformer in the prior art, and the steps are complex, and the steps for detecting the wiring correctness of the relay protection current loop of the transformer are simple.
In an alternative embodiment, referring to fig. 1, the method for detecting the secondary current loop further includes:
if the high-side phase current data is correct, step S500 is performed.
And step S500, judging whether the current data of each phase at the low-voltage side is correct or not according to the current data of each phase at the high-voltage side. If the low-side phase current data is not correct, step S600 is performed, and if the low-side phase current data is correct, step S700 is performed. In this embodiment, whether the current data of each phase on the low-voltage side is correct is determined by determining whether the difference between the vector angle of each phase current on the low-voltage side and the vector angle of each phase current on the corresponding high-voltage side meets a preset value. In a specific embodiment, the preset value is determined according to a connection mode of the transformer.
And step S600, outputting the low-voltage side data and judging failure.
And step S700, outputting the detection result.
In an alternative embodiment, referring to fig. 1, before performing step S200, the method for detecting a secondary current loop further includes:
step S800, judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not. Step S900 is performed if there is an abnormality in the data of the high-side current and the data of the low-side current, and step S200 is performed if there is no abnormality in the data of the high-side current and the data of the low-side current. In this embodiment, whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal is determined by determining whether the vector angles of the high-voltage side three-phase currents of the transformer are respectively I, II, and III, and the vector angles of the low-voltage side three-phase currents of the transformer are respectively 1, 2, and 3, within the interval [0,360 ].
In step S900, there is an abnormality in the output input data. In the embodiment, if one of I, II and III is not in the interval [0,360) or the data of the two are equal, the data of the high-voltage side is output to be abnormal; if one of the 1, 2 and 3 is not in the interval [0,360) or the two data are equal, outputting the data on the low-voltage side to be abnormal; if all the I, II, III and 1, 2, 3 are not in the interval [0,360) or the data of the two are equal, the data on the high-voltage side and the low-voltage side are output to be abnormal.
By selecting one phase of the high-voltage side phase currents as a reference current and judging whether the acquired input data is abnormal or not before judging the correctness of the high-voltage side phase currents, the problem possibly occurring in data measurement can be found in time, the error of a detection result caused by the abnormal data is prevented, and the detection accuracy of the secondary current loop detection method is improved.
In an alternative embodiment, when step S300 is executed, please refer to fig. 2, the determining process includes:
in step S301, it is determined whether the vector angle between the high-voltage-side phase currents differs by 120 ± 10 degrees. Step S302 is performed if the vector angle between the high-voltage side phase currents differs by 120 ± 10 degrees, and step S303 is performed if the vector angle between the high-voltage side phase currents does not differ by 120 ± 10 degrees. In the present embodiment, it is determined whether the vector angle between the high-side phase currents differs by 120 ± 10 degrees by determining whether phase a leads phase B by 120 ± 10 degrees or lags phase B by 240 ± 10 degrees and whether phase a leads phase C by 240 ± 10 degrees or lags phase C by 120 ± 10 degrees.
In step S302, the high-side current data is correct. In the present embodiment, the correct high-side current data indicates whether the a phase leads the B phase by 120 ± 10 degrees or lags the B phase by 240 ± 10 degrees, and whether the a phase leads the C phase by 240 ± 10 degrees or lags the C phase by 120 ± 10 degrees.
In step S303, one or two of the high-voltage-side currents other than the reference current are inverted. In the present embodiment, when the a phase is not advanced by 120 ± 10 degrees or lagged by 240 ± 10 degrees from the B phase, the B phase is inverted and S304 is performed, and when the a phase is not advanced by 240 ± 10 degrees or lagged by 120 ± 10 degrees from the C phase, the C phase is inverted and S304 is performed.
Step S304, whether the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees is judged. Step S302 is performed if the vector angle between the high-side phase currents after the phase inversion differs by 120 ± 10 degrees, and step S305 is performed if the vector angle between the high-side phase currents is not different by 120 ± 10 degrees. In the embodiment, whether the vector angle between the high-voltage side phase currents after phase inversion differs by 120 ± 10 degrees is determined by determining whether the phase a leads the phase B after phase inversion by 120 ± 10 degrees or lags the phase B after phase inversion by 240 ± 10 degrees or lags the phase a by 120 ± 10 degrees.
In step S305, the current data of each phase on the high voltage side is incorrect. In the present embodiment, the high-side phase current data is incorrect, meaning that phase a is not advanced by 120 ± 10 degrees or lagged by 240 ± 10 degrees from phase B after the phase inversion, and/or phase a is not advanced by 240 ± 10 degrees or lagged by 120 ± 10 degrees from phase C after the phase inversion.
In this embodiment, the ± 10 degrees is a margin set to prevent an error generated when the ammeter measures data and to determine correct data as an error, thereby causing an error in determining the correctness of the transformer wiring, and in a specific embodiment, the magnitude of the margin may be adjusted according to a specific scenario such as the measurement accuracy of the ammeter.
In an alternative embodiment, the connection mode of the secondary current loop is YY connection, and when step S500 is executed, referring to fig. 3, the determining process includes:
in step S501, the high-side phase current and the low-side phase current are in one-to-one correspondence. In this embodiment, 1, 2, and 3 may be named phase a, phase B, and phase C, respectively, where phase a corresponds to phase a, phase B corresponds to phase B, and phase C corresponds to phase C.
Step S502, judging whether the vector angle of each phase current on the high-voltage side and the corresponding vector angle of each phase current on the low-voltage side have a difference of 180 +/-10 degrees. If the vector angle of each phase current on the high-voltage side is different from the vector angle of each phase current on the corresponding low-voltage side by 180 +/-10 degrees, step S503 is executed, and if the vector angle of each phase current on the high-voltage side is not different from the vector angle of each phase current on the corresponding low-voltage side by 180 +/-10 degrees, step S504 is executed. In the present embodiment, it is determined whether the vector angle of the high-side phase current differs from the vector angle of the corresponding low-side phase current by 180 ± 10 degrees by determining whether phase a leads or lags phase a by 180 ± 10 degrees, phase B leads or lags phase B by 180 ± 10 degrees, and phase C leads or lags phase C by 180 ± 10 degrees.
In step S503, the low-voltage-side current data is correct. In the present embodiment, the low-side phase current data is correct, i.e., phase a leads or lags phase a by 180 ± 10 degrees, phase B leads or lags phase B by 180 ± 10 degrees, and phase C leads or lags phase C by 180 ± 10 degrees.
In step S504, one or more phases of the corresponding low-side phase currents are inverted. In the present embodiment, when the a phase is not advanced or delayed 180 ± 10 degrees from the a phase, the a phase is inverted and step S505 is performed, when the B phase is not advanced or delayed 180 ± 10 degrees from the B phase, the B phase is inverted and step S505 is performed, and when the C phase is not advanced or delayed 180 ± 10 degrees from the C phase, the C phase is inverted and step S505 is performed.
Step S505 is performed to determine whether the vector angle of the high-voltage-side phase current differs from the vector angle of the corresponding inverted low-voltage-side phase current by 180 ± 10 degrees. If the vector angle of the high-voltage side phase current is different from the vector angle of the low-voltage side phase current corresponding to the phase-reversed phase by 180 + -10 degrees, step S503 is executed, and if the vector angle of the high-voltage side phase current is not different from the vector angle of the low-voltage side phase current corresponding to the phase-reversed phase by 180 + -10 degrees, step S506 is executed. In the embodiment, whether the vector angle of each phase current on the high-pressure side is different from the vector angle of each phase current on the corresponding low-pressure side by 180 +/-10 degrees is judged by judging whether the phase A is advanced or lagged by 180 +/-10 degrees compared with the phase a after phase inversion, and/or whether the phase B is advanced or lagged by 180 +/-10 degrees compared with the phase B after phase inversion, and/or whether the phase C is advanced or lagged by 180 +/-10 degrees compared with the phase C after phase inversion.
In step S506, it is determined whether the correspondence between all the high-voltage-side phase currents and the low-voltage-side phase currents is determined. If the corresponding relationship between all the high-side phase currents and the low-side phase currents is not determined, step S507 is executed, and step S502 to step S506 are repeatedly executed, and if the corresponding relationship between all the high-side phase currents and the low-side phase currents is determined, step S508 is executed.
In step S507, the correspondence between the high-voltage-side current and the low-voltage-side current is changed. In the present embodiment, the correspondence relationship between the high-voltage side phase current and the low-voltage side phase current, that is, the correspondence relationship between the high-voltage side phase current and the low-voltage side phase current, may be changed by respectively naming 1, 2, and 3 as one of a phase, and C phase, B phase, C phase, and a phase, C phase, a phase, and B phase, or C phase, B phase, and a phase, where a phase corresponds to a, B phase corresponds to B, and C phase corresponds to C, that is, the correspondence relationship between the high-voltage side phase current and the low-voltage side phase current is six in total.
In step S508, the current data of each phase on the low voltage side is incorrect. In this embodiment, the low-side phase current data is incorrect, meaning that phase a does not lead or lag phase a after phase inversion by 180 ± 10 degrees, and/or phase B does not lead or lag phase B after phase inversion by 180 ± 10 degrees, and/or phase C does not lead or lag phase C after phase inversion by 180 ± 10 degrees.
In this embodiment, the ± 10 degrees is a margin set to prevent an error generated when the ammeter measures data and to determine correct data as an error, thereby causing an error in determining the correctness of the transformer wiring, and in a specific embodiment, the magnitude of the margin may be adjusted according to a specific scenario such as the measurement accuracy of the ammeter.
In an alternative embodiment, the connection mode of the secondary current loop is YD11 connection, and when step S500 is executed, referring to fig. 4, the determining process includes:
step S510, the high-side phase current and the low-side phase current are in one-to-one correspondence. In this embodiment, 1, 2, and 3 may be named phase a, phase B, and phase C, respectively, where phase a corresponds to phase a, phase B corresponds to phase B, and phase C corresponds to phase C.
In step S520, it is determined whether the high-side phase current leads the corresponding low-side phase current by 150 + -10 degrees or lags the corresponding low-side phase current by 210 + -10 degrees. Step S530 is performed if the high-side phase current is advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees from the corresponding low-side phase current, and step S540 is performed if the high-side phase current is neither advanced by 150 ± 10 degrees nor delayed by 210 ± 10 degrees from the corresponding low-side phase current. In the present embodiment, it is determined whether the high-side phase current is advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees from the corresponding low-side phase current or lagged by 210 ± 10 degrees by determining whether the a phase is advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees from the a phase, the B phase is advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees from the B phase, and the C phase is advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees from the C phase.
In step S530, the low-voltage-side current data is correct. In the present embodiment, the current data of each phase on the low voltage side correctly means that phase a leads phase a by 150 ± 10 degrees or lags phase a by 210 ± 10 degrees, phase B leads phase B by 150 ± 10 degrees or lags phase B by 210 ± 10 degrees, and phase C leads phase C by 150 ± 10 degrees or lags phase C by 210 ± 10 degrees.
In step S540, one or more phases of the corresponding low-side phase currents are inverted. In the present embodiment, when the a phase is not advanced 150 ± 10 degrees or lagged 210 ± 10 degrees from the a phase, the a phase is inverted and step S550 is performed, when the B phase is not advanced 150 ± 10 degrees or lagged 210 ± 10 degrees from the B phase, the B phase is inverted and step S550 is performed, and when the C phase is not advanced 150 ± 10 degrees or lagged 210 ± 10 degrees from the C phase, the C phase is inverted and step S550 is performed.
In step S550, it is determined whether the high-side phase current leads the corresponding phase-inverted low-side phase current by 150 + -10 degrees or lags by 210 + -10 degrees. Step S530 is performed if the high-side phase current is advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees from the corresponding phase-reversed low-side phase current, and step S560 is performed if the high-side phase current is not advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees from the corresponding phase-reversed low-side phase current. In the present embodiment, it is determined whether the high-side phase current is advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees with respect to the low-side phase current after the phase inversion, by determining whether the phase a is advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees with respect to the phase a after the phase inversion, and/or whether the phase B is advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees with respect to the phase B after the phase inversion, and/or whether the phase C is advanced by 150 ± 10 degrees or delayed by 210 ± 10 degrees with respect to the phase C after the phase inversion.
In step S560, it is determined whether or not all the correspondence relationships between the high-side phase current and the low-side phase current have been determined. If the correspondence relationship between all the high-side phase currents and the low-side phase currents is not determined, step S570 is executed, and steps S520 to S560 are repeatedly executed, and if the correspondence relationship between all the high-side phase currents and the low-side phase currents is determined, step S580 is executed.
In step S570, the correspondence between the high-side phase current and the low-side phase current is changed. In the present embodiment, the correspondence relationship between the high-voltage side phase current and the low-voltage side phase current, that is, the correspondence relationship between the high-voltage side phase current and the low-voltage side phase current, may be changed by respectively naming 1, 2, and 3 as one of a phase, and C phase, B phase, C phase, and a phase, C phase, a phase, and B phase, or C phase, B phase, and a phase, where a phase corresponds to a, B phase corresponds to B, and C phase corresponds to C, that is, the correspondence relationship between the high-voltage side phase current and the low-voltage side phase current is six in total.
In step S580, the current data of each phase on the low voltage side is incorrect. In the present embodiment, the low-side phase current data is incorrect, which means that phase a is not advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees than phase a after the phase inversion, and/or phase B is not advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees than phase B after the phase inversion, and/or phase C is not advanced by 150 ± 10 degrees or lagged by 210 ± 10 degrees than phase C after the phase inversion.
In this embodiment, the ± 10 degrees is a margin set to prevent an error generated when the ammeter measures data and to determine correct data as an error, thereby causing an error in determining the correctness of the transformer wiring, and in a specific embodiment, the magnitude of the margin may be adjusted according to a specific scenario such as the measurement accuracy of the ammeter.
In the method for detecting a secondary current loop provided in this embodiment, the wiring manner of the secondary loop is YY connection or YD11 connection, so that the wiring correctness of the relay protection current loop with two wiring manners of YY connection and YD11 connection can be directly determined, and the application range of the method for detecting a secondary current loop is expanded.
In an alternative embodiment, the detection result includes: a vector angle of the reference current; vector angles of all phase currents on the high-voltage side and whether the phase is reversed or not; the vector angle of each phase current on the low-voltage side and whether the phase is reversed or not; the corresponding relation between each phase current at the high-voltage side and each phase current at the low-voltage side; and/or, a load property map of the reference current; and/or a vector diagram of the high-side phase current and the low-side phase current.
In the present embodiment, a vector diagram is drawn based on the vector angle of the high-side phase current, the vector angle of the low-side phase current, and the correspondence relationship between the high-side phase current and the low-side phase current. And drawing the load property diagram according to the vector angle of the reference current, wherein in the specific embodiment, the longitudinal axis in the horizontal and longitudinal axes is marked as 0 degree, the horizontal coordinate is marked as Q, the vertical coordinate is marked as P/U, the reference current is drawn by taking the clockwise direction as the positive direction, and the angle and the relation between the reference current and the other two phases of currents on the high-voltage side are marked, so that the drawing of the load property diagram is completed.
Example 2
Referring to fig. 5, the secondary current loop detection apparatus of the present embodiment includes: the input module 100, the selection module 200, the high-pressure side determination module 300, the first output module 400, the low-pressure side determination module 500, the second output module 600, and the third output module 700, wherein:
the input module 100 is configured to obtain data of a secondary current loop, where the data includes a vector angle of each phase current on a high-voltage side and a vector angle of each phase current on a low-voltage side; the selection module 200 is configured to select one of the high-voltage-side phase currents as a reference current; the high-voltage side judging module 300 is configured to judge whether each phase current data of the high-voltage side is correct according to the reference current; the first output module 400 is used for outputting the high-pressure side data and judging failure; the low-voltage side judging module 500 is configured to judge whether current data of each phase of the low-voltage side is correct according to current data of each phase of the high-voltage side; the second output module 600 is configured to output the low-voltage side data and determine a failure; the third output module 700 is used for outputting the detection result.
In an optional embodiment, the secondary current loop detection device further includes an abnormality determination unit configured to determine whether there is an abnormality in the data of the high-voltage side current and the data of the low-voltage side current; and the fourth output unit is used for outputting the input data with abnormity.
In an alternative embodiment, the high pressure side determination module comprises: the first judging unit is used for judging whether the vector angle between the currents of the high-voltage side phases is different by 120 +/-10 degrees; a first adjustment unit for inverting one phase or two phases of each phase current of the high-voltage side other than the reference current; and the second judging unit is used for judging whether the vector angle between the phase currents of the high-voltage side after phase inversion is different from 120 +/-10 degrees.
In an alternative embodiment, the secondary current loop is connected in a YY connection mode; the low pressure side judgment module includes: the setting unit is used for corresponding the high-voltage side phase current and the low-voltage side phase current one by one; the third judging unit is used for judging whether the vector angle of each phase current on the high-voltage side and the vector angle of each phase current on the corresponding low-voltage side are different by 180 +/-10 degrees or not; the second adjusting unit is used for inverting one phase or multiple phases in the corresponding low-voltage side phase current; the fourth judging unit is used for judging whether the vector angle of each phase current on the high-voltage side and the vector angle of each phase current on the corresponding low-voltage side after phase inversion are different by 180 +/-10 degrees or not; and the first circulating unit is used for changing the corresponding relation between the high-voltage side phase current and the low-voltage side phase current and judging whether the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged.
In an alternative embodiment, the secondary current loop is wired in the manner of YD11 connection; the low pressure side judgment module includes: the second setting unit is used for corresponding the high-voltage side phase current and the low-voltage side phase current one by one; a fifth judging unit for judging whether the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees or lags by 210 +/-10 degrees; a third adjusting unit, for inverting one or more phases of the corresponding low-voltage side phase currents; a sixth judging unit for judging whether the high-voltage side phase current is ahead of the corresponding phase-reversed low-voltage side phase current by 150 + -10 degrees or behind by 210 + -10 degrees; and the second circulating unit is used for changing the corresponding relation between the high-voltage side phase current and the low-voltage side phase current and judging whether the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged.
Example 3
The embodiment provides a computer device, comprising a processor, wherein the processor is used for executing a computer program stored in a memory, and realizing the following method:
acquiring data of a secondary current loop; the data comprises vector angles of the high-voltage side phase currents and the low-voltage side phase currents of the transformer; selecting one phase current of the high-voltage side phase currents as a reference current; judging whether the current data of each phase at the high-voltage side is correct or not according to the reference current; and if the current data of each phase on the high-voltage side is incorrect, outputting the data on the high-voltage side to fail to judge.
In an optional embodiment, the secondary current loop detection method further includes: if the current data of each phase on the high-voltage side is correct, judging whether the current data of each phase on the low-voltage side is correct or not according to the current data of each phase on the high-voltage side; if the current data of each phase of the low-voltage side is incorrect, outputting the data of the low-voltage side to fail to judge; and if the current data of each phase on the low-voltage side is correct, outputting a detection result.
In an alternative embodiment, before selecting one of the high-side phase currents as the reference current, the method further includes: judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not; and if the data of the high-voltage side current and the data of the low-voltage side current are abnormal, the output and input data are abnormal.
In an alternative embodiment, the judging the correctness of the current data of each phase at the high-voltage side according to the reference current comprises the following steps: judging whether the vector angle difference between the currents of the high-voltage side phases is 120 +/-10 degrees or not; if the vector angle between the high-side phase currents differs by 120 + -10 degrees, the high-side current data is correct.
In an alternative embodiment, the determining the correctness of the current data of each phase on the high-voltage side according to the reference current further includes: if the vector angle between the high-voltage side phase currents is not 120 +/-10 degrees, inverting one phase or two phases of the high-voltage side phase currents except the reference current; judging whether the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees or not; if the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees, the current data of the high-voltage side is correct; if the vector angle between the high-side phase currents is not 120 + -10 degrees, the high-side phase current data is incorrect.
In an alternative embodiment, the secondary current loop is connected in a YY connection mode; if the high-voltage side current data of each phase is correct, judging the correctness of the low-voltage side current data of each phase according to the high-voltage side current data of each phase comprises the following steps: corresponding each phase current of the high-voltage side to each phase current of the low-voltage side one by one; judging whether the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the corresponding low-voltage side have a difference of 180 +/-10 degrees or not; if the vector angle of each phase current of the high-voltage side is 180 +/-10 degrees different from the vector angle of each phase current of the corresponding low-voltage side, the data of each phase current of the low-voltage side is correct; if the vector angle of each phase current on the high-voltage side is different from the vector angle of each phase current on the corresponding low-voltage side by 180 +/-10 degrees, inverting one phase or multiple phases in each phase current on the corresponding low-voltage side; judging whether the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the low-voltage side after corresponding phase inversion have a difference of 180 +/-10 degrees or not; if the vector angle of each phase current of the high-voltage side is 180 +/-10 degrees different from the vector angle of each phase current of the low-voltage side after corresponding phase inversion, the data of each phase current of the low-voltage side is correct; if the difference between the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the low-voltage side after corresponding phase inversion is not 180 +/-10 degrees, judging whether the corresponding relation between all the phase currents of the high-voltage side and the phase currents of the low-voltage side is judged; if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is not judged, changing the corresponding relation between the high-voltage side phase currents and the low-voltage side phase currents, and repeating the judging step; and if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged, the low-voltage side phase currents have incorrect data.
In an alternative embodiment, the secondary current loop is wired in the manner of YD11 connection; if the high-voltage side current data of each phase is correct, judging the correctness of the low-voltage side current data of each phase according to the high-voltage side current data of each phase comprises the following steps: corresponding each phase current of the high-voltage side to each phase current of the low-voltage side one by one; judging whether each phase current of the high-voltage side leads the corresponding each phase current of the low-voltage side by 150 +/-10 degrees or lags by 210 +/-10 degrees; if the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees or lags by 210 +/-10 degrees, the low-voltage side phase current data is correct; if the high-voltage side phase current is not advanced by 150 +/-10 degrees or lagged by 210 +/-10 degrees than the corresponding low-voltage side phase current, inverting one phase or multiple phases in the corresponding low-voltage side phase current; judging whether each phase current of the high-voltage side leads by 150 +/-10 degrees or lags by 210 +/-10 degrees compared with each phase current of the low-voltage side after corresponding phase inversion; if the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees after phase inversion or lags by 210 +/-10 degrees, the low-voltage side phase current data is correct; if the high-voltage side phase current is not advanced by 150 +/-10 degrees or lagged by 210 +/-10 degrees compared with the corresponding low-voltage side phase current after phase inversion, judging whether the corresponding relation between all high-voltage side phase currents and all low-voltage side phase currents is judged; if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is not judged, changing the corresponding relation between the high-voltage side phase currents and the low-voltage side phase currents, and repeating the judging step; and if the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged, the low-voltage side phase currents have incorrect data.
In an alternative embodiment, the detection result includes: a vector angle of the reference current; vector angles of all phase currents on the high-voltage side and whether the phase is reversed or not; the vector angle of each phase current on the low-voltage side and whether the phase is reversed or not; the corresponding relation between each phase current at the high-voltage side and each phase current at the low-voltage side; and/or, a load property map of the reference current; and/or a vector diagram of the high-side phase current and the low-side phase current.
Example 4
The present embodiment provides a computer-readable storage medium having a computer program stored thereon. Those skilled in the art will appreciate that all or part of the processes for implementing the method in embodiment 1 can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (11)
1. A secondary current loop detection method is characterized by comprising the following steps:
acquiring data of a secondary current loop; wherein the data comprises a vector angle of each phase current on a high-voltage side and a vector angle of each phase current on a low-voltage side of the transformer;
judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not by judging whether the vector angles of the high-voltage side three-phase current of the transformer are I, II and III respectively, and whether the vector angles of the low-voltage side three-phase current of the transformer are 1, 2 and 3 respectively, and whether the vector angles are in an interval of [0 DEG and 360 DEG or not;
the judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not specifically comprises the following steps:
if one of the I, II and III is not in the interval [0 DEG, 360 DEG ] or the two data are equal, outputting abnormal data on the high-voltage side; if one of the vector angle 1, the vector angle 2 and the vector angle 3 is not in the interval [0 DEG, 360 DEG ] or the two data are equal, outputting the low-voltage side data to be abnormal; if the I, II and III are not in the interval [0 DEG, 360 DEG ] or the two data are equal to each other with the vector angle 1, the vector angle 2 and the vector angle 3, outputting abnormal data on the high-voltage side and the low-voltage side;
if the data of the high-voltage side current and the data of the low-voltage side current are abnormal, outputting and inputting the data, and judging whether the data are abnormal;
when the data of the high-voltage side current and the data of the low-voltage side current are not abnormal, selecting one phase current in the high-voltage side current as a reference current;
judging whether the current data of each phase at the high-voltage side is correct or not according to the reference current, specifically:
judging whether the current data of each phase of the high-voltage side is correct or not by judging the vector angle between the currents of each phase of the high-voltage side and judging whether the vector angle between the currents of each phase of the high-voltage side, which is one phase or two phases of the currents of each phase of the high-voltage side except the reference current are opposite in phase, is 120 +/-10 degrees or not;
if the current data of each phase of the high-voltage side is incorrect, outputting the data of the high-voltage side to fail to judge;
if the current data of each phase at the high-voltage side is correct, judging whether the current data of each phase at the low-voltage side is correct according to the current data of each phase at the high-voltage side, specifically:
determining a preset value according to the connection mode of the transformer, and judging whether current data of each phase on the low-voltage side is correct or not by judging whether the difference value between the vector angle of each phase current on the low-voltage side and the vector angle of each phase current on the corresponding high-voltage side meets the preset value or not;
if the current data of each phase of the low-voltage side is incorrect, outputting the data of the low-voltage side to fail to judge;
and if the current data of each phase on the low-voltage side is correct, outputting a detection result.
2. The secondary current loop detection method according to claim 1, wherein the determining the correctness of the current data of each phase on the high-voltage side according to the reference current comprises:
judging whether the vector angle difference between the currents of the high-voltage side phases is 120 +/-10 degrees or not;
if the vector angle between the high-voltage side phase currents is different by 120 +/-10 degrees, the high-voltage side current data is correct.
3. The method for detecting the secondary current loop according to claim 2, wherein the determining the correctness of the current data of each phase on the high-voltage side according to the reference current further comprises:
inverting one or both of the high-side phase currents except the reference current if the vector angle between the high-side phase currents is not 120 ± 10 degrees apart;
judging whether the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees or not;
if the vector angle difference between the phase currents of the high-voltage side after phase inversion is 120 +/-10 degrees, the current data of the high-voltage side is correct;
if the vector angle between the high-voltage side phase currents is not 120 +/-10 degrees, the high-voltage side phase current data is incorrect.
4. The method according to claim 1, wherein the secondary current loop is connected in a YY connection manner; if the high-voltage side current data of each phase is correct, judging the correctness of the low-voltage side current data of each phase according to the high-voltage side current data of each phase comprises the following steps:
corresponding the high-voltage side phase current to the low-voltage side phase current one by one;
judging whether the vector angle of each phase current of the high-voltage side and the corresponding vector angle of each phase current of the low-voltage side have a difference of 180 +/-10 degrees or not;
if the vector angle of each phase current of the high-voltage side and the corresponding vector angle of each phase current of the low-voltage side have a difference of 180 +/-10 degrees, the data of each phase current of the low-voltage side is correct;
if the vector angle of each phase current on the high-voltage side is different from the vector angle of each phase current on the corresponding low-voltage side by 180 +/-10 degrees, inverting one phase or multiple phases in each phase current on the corresponding low-voltage side;
judging whether the difference between the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the corresponding reversed-phase low-voltage side is 180 +/-10 degrees;
if the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the corresponding reversed phase of the low-voltage side have a difference of 180 +/-10 degrees, the data of each phase current of the low-voltage side is correct;
if the difference between the vector angle of each phase current of the high-voltage side and the vector angle of each phase current of the low-voltage side after corresponding phase inversion is not 180 +/-10 degrees, judging whether the corresponding relation between all the phase currents of the high-voltage side and the phase currents of the low-voltage side is judged;
if the corresponding relation between all the high-voltage side phase currents and the low-voltage side phase currents is not judged completely, changing the corresponding relation between the high-voltage side phase currents and the low-voltage side phase currents, and repeating the judging step;
and if the corresponding relation between all the high-voltage side phase currents and the low-voltage side phase currents is judged, the low-voltage side phase currents have incorrect data.
5. The secondary current loop detection method according to claim 1, wherein the secondary current loop is wired in a manner of YD11 connection; if the high-voltage side current data of each phase is correct, judging the correctness of the low-voltage side current data of each phase according to the high-voltage side current data of each phase comprises the following steps:
judging whether the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees or lags by 210 +/-10 degrees;
if the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees or lags by 210 +/-10 degrees, the low-voltage side phase current data is correct;
inverting one or more phases of the corresponding low-side phase current if the high-side phase current is not advanced by 150 + -10 degrees or is not retarded by 210 + -10 degrees from the corresponding low-side phase current;
judging whether the high-voltage side phase current leads the corresponding low-voltage side phase current by 150 +/-10 degrees or lags by 210 +/-10 degrees;
if the high-voltage side phase current leads by 150 +/-10 degrees or lags by 210 +/-10 degrees than the corresponding low-voltage side phase current after phase inversion, the low-voltage side phase current data is correct;
and if the high-voltage side phase current is not advanced by 150 +/-10 degrees or lagged by 210 +/-10 degrees than the corresponding low-voltage side phase current after phase inversion, judging whether the corresponding relation between all the high-voltage side phase currents and the low-voltage side phase currents is completely judged.
6. The secondary current loop detection method according to claim 4 or 5, wherein the detection result includes:
a vector angle of the reference current;
the vector angle of each phase current of the high-voltage side and whether the phase is reversed or not;
the vector angle of each phase current of the low-voltage side and whether the phase is reversed or not;
the corresponding relation between the high-voltage side phase current and the low-voltage side phase current; and/or the presence of a gas in the gas,
a load property map of the reference current; and/or the presence of a gas in the gas,
a vector diagram of the high-side phase current and the low-side phase current.
7. A secondary current loop detection device, comprising:
the input module is used for acquiring data of a secondary current loop, wherein the data comprises a vector angle of each phase current on a high-voltage side and a vector angle of each phase current on a low-voltage side;
the abnormality judgment unit judges whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not by judging whether the vector angles of the high-voltage side three-phase current of the transformer are I, II and III respectively and whether the vector angles of the low-voltage side three-phase current of the transformer are 1, 2 and 3 respectively within an interval of [0 DEG and 360 DEG or not;
the judging whether the data of the high-voltage side current and the data of the low-voltage side current are abnormal or not specifically comprises the following steps:
if one of the I, II and III is not in the interval [0 DEG, 360 DEG ] or the two data are equal, outputting abnormal data on the high-voltage side; if one of the vector angle 1, the vector angle 2 and the vector angle 3 is not in the interval [0 DEG, 360 DEG ] or the two data are equal, outputting the low-voltage side data to be abnormal; if the I, II and III are not in the interval [0 DEG, 360 DEG ] or the two data are equal to each other with the vector angle 1, the vector angle 2 and the vector angle 3, outputting abnormal data on the high-voltage side and the low-voltage side;
the fourth output unit is used for outputting input data with abnormity;
the selection module is used for selecting one phase current in the high-voltage side current and the low-voltage side current as a reference current when the data of the high-voltage side current and the data of the low-voltage side current are not abnormal;
the high-voltage side judgment module is used for judging whether the current data of each phase of the high-voltage side is correct according to the reference current, and specifically comprises the following steps:
judging whether the current data of each phase of the high-voltage side is correct or not by judging the vector angle between the currents of each phase of the high-voltage side and judging whether the vector angle between the currents of each phase of the high-voltage side, which is one phase or two phases of the currents of each phase of the high-voltage side except the reference current are opposite in phase, is 120 +/-10 degrees or not;
the first output module is used for outputting the data on the high-voltage side to judge failure;
the low-voltage side judging module is used for judging whether the current data of each phase of the low-voltage side is correct according to the current data of each phase of the high-voltage side, and specifically comprises the following steps:
determining a preset value according to the connection mode of the transformer, and judging whether current data of each phase on the low-voltage side is correct or not by judging whether the difference value between the vector angle of each phase current on the low-voltage side and the vector angle of each phase current on the corresponding high-voltage side meets the preset value or not;
the second output module is used for outputting the data at the low-voltage side to judge failure;
and the third output module is used for outputting the detection result.
8. The device according to claim 7, wherein the high-side determining module comprises:
the first judgment unit is used for judging whether the vector angle between the high-voltage side phase currents is different by 120 +/-10 degrees;
a first adjustment unit for inverting one phase or two phases of the high-voltage-side respective-phase currents except the reference current;
and the second judging unit is used for judging whether the vector angle between the phase of each phase of the high-voltage side after phase inversion is different from 120 +/-10 degrees.
9. The device according to claim 7, wherein the secondary current loop is connected in a YY connection manner; the low-pressure side judgment module comprises:
the setting unit is used for corresponding the high-voltage side phase current and the low-voltage side phase current one by one;
the third judging unit is used for judging whether the vector angle of each phase current on the high-voltage side and the corresponding vector angle of each phase current on the low-voltage side have a difference of 180 +/-10 degrees or not;
a second adjusting unit, for inverting one or more phases of the corresponding low-voltage side phase currents;
the fourth judging unit is used for judging whether the difference between the vector angle of each phase current on the high-voltage side and the vector angle of each phase current on the corresponding reversed phase on the low-voltage side is 180 +/-10 degrees;
and the first circulating unit is used for changing the corresponding relation between the high-voltage side phase current and the low-voltage side phase current and judging whether the corresponding relation between all the high-voltage side phase currents and all the low-voltage side phase currents is judged.
10. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of any one of claims 1-6.
11. A computer-readable storage medium, on which a computer program is stored, characterized in that a processor is adapted to execute the computer program stored in the storage medium to implement the method according to any of claims 1-6.
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| CN109738714B (en) * | 2019-03-20 | 2021-04-13 | 国家电网有限公司 | Secondary phase checking method and device |
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