CN112083372A - Current transformer polarity identification method and system - Google Patents
Current transformer polarity identification method and system Download PDFInfo
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- CN112083372A CN112083372A CN202010846420.7A CN202010846420A CN112083372A CN 112083372 A CN112083372 A CN 112083372A CN 202010846420 A CN202010846420 A CN 202010846420A CN 112083372 A CN112083372 A CN 112083372A
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- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The invention provides a polarity identification method of a current transformer, which comprises the steps of obtaining a main transformer fault oscillograph generated by a oscillograph when a transformer runs with load; vector analysis is carried out on three-phase current waveforms of the high-voltage side and the low-voltage side of the main transformer in a main transformer fault oscillograph, and the obtained vector analysis result is consistent with the preset regulation requirement, so that the polarity of the current transformer of the high-voltage side and the low-voltage side of the main transformer is determined to be correct, and the oscillograph is correctly accessed; after the current secondary side equipment is connected into a secondary winding of a current transformer at the high-low voltage side of a main transformer, vector analysis is carried out on voltage data of three-phase current at the high-low voltage side of the main transformer of the current secondary side equipment to obtain a corresponding vector analysis result; if the vector analysis results of the current secondary side equipment and the main transformer fault recording graph are consistent, the current secondary side equipment access polarity is determined to be correct; otherwise, it is wrong. By implementing the invention, the problem of access polarity of the current transformer does not need to be tested repeatedly under the condition of equipment transformation or replacement, and the problems of misjudgment and low efficiency caused by the existing load tester can be solved.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a method and a system for identifying the polarity of a current transformer.
Background
The primary side voltage of the power system is high, the current is large, and the operation rated parameters are different, so that an instrument and a relay protection device for measuring or controlling the primary system cannot be directly connected, and therefore the primary side large current needs to be isolated by a current transformer, and the secondary relay protection device and the measuring instrument can safely and accurately acquire the current information of the primary electric loop.
The current transformer is used for converting large current into small current, isolating a secondary circuit connected with a relay and a measuring instrument from a high-voltage system of primary current, and converting the primary current into a secondary current value of 5A or 1A standard. The polarity of the current transformer is closely related to current protection, and if the leading-out terminal of any side of the current transformer is in error, the secondary side current phase changes by 180 degrees. When the polarity of the current transformer is wrong, the differential protection in the relay protection device is rejected or misoperated, so that serious consequences such as system instability and disconnection or system load flow variation cause the AVC and AGC systems to be misoperated and the like. Therefore, it is necessary to accurately identify the polarity of the current transformer to improve the safety of the grid operation.
In the prior art, the polarity of the current transformer is identified by a load tester, but the method is easy to cause misjudgment and low in efficiency, and particularly, under the condition that the workload of primary and secondary equipment transformation suddenly rises, such as protection replacement, primary equipment transformation, comprehensive transformation of a transformer substation and the like, the polarity of the current transformer needs to be retested for each transformed or replaced equipment. Meanwhile, the polarity judgment needs to be carried out by means of an external tool, and the test result is influenced by the quality of the loaded tester, the using method and other factors.
Therefore, a current transformer polarity identification method is urgently needed, the problem of repeatedly testing the connection polarity of the current transformer under the condition of equipment transformation or replacement is not needed, the problems of misjudgment and low efficiency caused by a load tester in the prior art are solved, the polarity judgment accuracy and efficiency of the current transformer are improved, the safe operation of a power grid is ensured, meanwhile, the existing equipment in a station can be fully utilized, the dependence on the load tester is eliminated, and the instrument cost is saved.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method for identifying the polarity of a current transformer, which does not need to repeatedly test the polarity of the current transformer access under the condition of device transformation or device replacement, so as to overcome the problems of misjudgment and low efficiency caused by a load-carrying tester in the prior art, improve the polarity judgment accuracy and efficiency of the current transformer, ensure the safe operation of a power grid, fully utilize the existing devices in a station, get rid of the dependence on the load-carrying tester, and save the device cost.
In order to solve the above technical problem, an embodiment of the present invention provides a method for identifying a polarity of a current transformer, where the method includes the following steps:
s1, after the technical improvement project of the power grid system is put into operation, acquiring a main transformer fault recording chart generated by a recorder when the transformer runs with load; wherein, a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform are formed on the main transformer fault recording chart;
step S2, carrying out vector analysis on the amplitude and phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform in the main transformer fault oscillograph, and when the vector analysis result of the main transformer fault oscillograph is judged to be consistent with the preset regulation requirement, determining that the oscillograph is connected into a secondary winding of a main transformer high-voltage side current transformer and a secondary winding of a main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at the two sides of the transformer are correctly set;
step S3, after the current secondary side equipment is connected with a secondary winding of a main transformer high-voltage side current transformer and a secondary winding of a main transformer low-voltage side current transformer, obtaining corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data on the current secondary side equipment, and carrying out vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data obtained by the current secondary side equipment to obtain a vector analysis result of the current secondary side equipment;
step S4, if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the main transformer fault recording chart, the polarity of the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer accessed by the current secondary side equipment are determined to be correct; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
Wherein the method further comprises:
and if the vector analysis result of the obtained main transformer fault recording diagram is judged to be inconsistent with the preset regulation requirement, the polarity of the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer accessed by the oscillograph are adjusted until the vector analysis result of the obtained main transformer fault recording diagram is consistent with the preset regulation requirement.
Wherein the method further comprises:
after the polarity errors of the secondary windings of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer are identified, the polarities of the secondary windings of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer are adjusted according to the polarities of the secondary windings of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer accessed by the oscillograph.
And any vector analysis result is obtained by taking the moment when the phase angle of a phase voltage waveform of a certain phase in ABC is 0 as a reference moment, and performing vector analysis on the amplitude and the phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform at the reference moment and displaying the vector analysis result by using a vector diagram.
Wherein, the current secondary side equipment is one of a relay protection device, a measurement and control device and a meter.
The embodiment of the present invention further provides a system for identifying polarity of a current transformer, including:
the wave recorder access data acquisition unit is used for acquiring a main transformer fault wave recording diagram generated by the wave recorder when the transformer runs with load after the technical improvement project of the power grid system is put into operation; wherein, a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform are formed on the main transformer fault recording chart;
the wave recorder access data analysis and polarity determination unit is used for carrying out vector analysis on the phase current amplitude and the phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform in the main transformer fault wave recording diagram, and when the vector analysis result of the main transformer fault wave recording diagram is determined to be consistent with the preset regulation requirement, the wave recorder is determined to be accessed to the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at the two sides of the transformer are correctly set;
the secondary side equipment access data acquisition and analysis unit is used for obtaining corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data on the current secondary side equipment after the current secondary side equipment is accessed into a main transformer high-voltage side current transformer secondary winding and a main transformer low-voltage side current transformer secondary winding, and carrying out vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data obtained by the current secondary side equipment to obtain a vector analysis result of the current secondary side equipment;
the secondary side equipment access polarity identification unit is used for determining that the polarity of the secondary winding of the current secondary side equipment access main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are correct if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the main transformer fault recording chart; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
Wherein, still include: the oscillograph is connected with a polarity adjusting unit;
and the wave recorder is connected with the polarity adjusting unit and used for adjusting the polarity of the wave recorder connected with the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer until the vector analysis result of the obtained main transformer fault wave recording chart is consistent with the preset regulation requirement if the vector analysis result of the obtained main transformer fault wave recording chart is judged to be inconsistent with the preset regulation requirement.
Wherein, still include: the secondary side equipment is connected with a polarity adjusting unit;
and the secondary side equipment is connected with a polarity adjusting unit and used for adjusting the polarity of the secondary winding of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer according to the polarity of the secondary winding of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer accessed by the oscillograph after the polarity error of the secondary winding of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer is identified.
Wherein, the current secondary side equipment is one of a relay protection device, a measurement and control device and a meter.
The embodiment of the invention has the following beneficial effects:
after the project of power grid technical improvement is completed, vector analysis results obtained by analyzing the current amplitude and the phase angle of three-phase current waveforms at the high-low voltage side of a main transformer fault oscillograph on an oscillograph are compared with preset regulation requirements to judge the polarity of the current transformer at the high-low voltage side of the main transformer and the polarity of a secondary winding of the oscillograph accessed to the current transformer, and on the premise of judging the polarity to be correct, the vector analysis results of the main transformer fault oscillograph are used as a reference object, the reference comparison is carried out by using the current amplitude and the phase angle analysis results after the current secondary equipment is accessed to quickly judge the correctness of the access polarity of the current secondary equipment, and the access polarity of the oscillograph is used as an alteration scheme to carry out adjustment when the access is wrong, so that the problem of the access polarity of the current transformer does not need to be tested repeatedly under the condition of equipment transformation, the problem of misjudgment and low efficiency caused by a load tester in the prior art can be solved, personal errors are avoided, existing equipment in a station is utilized, dependence on the load tester is eliminated, the instrument cost is saved, the polarity judgment correctness and efficiency of the current transformer are improved, and the safe operation of a power grid is ensured.
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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a polarity identification method for a current transformer according to an embodiment of the present invention;
fig. 2 is a secondary side current phase relationship diagram of a YN d11 wiring transformer in the current transformer polarity identification method according to the embodiment of the present invention under normal conditions;
fig. 3 is a schematic connection diagram of a transformer and buses on a 110kV bus side and a 10kV side in an application scenario of the method for identifying the polarity of a current transformer according to the embodiment of the present invention;
FIG. 4 is a vector analysis result diagram obtained by vector analysis of a main transformer fault oscillograph generated by the oscillograph during the transformer load operation in FIG. 3;
fig. 5 is a schematic diagram of a polarity identification structure of a current transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a method for identifying a polarity of a current transformer provided in an embodiment of the present invention includes the following steps:
s1, after the technical improvement project of the power grid system is put into operation, acquiring a main transformer fault recording chart generated by a recorder when the transformer runs with load; wherein, a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform are formed on the main transformer fault recording chart;
step S2, carrying out vector analysis on the amplitude and phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform in the main transformer fault oscillograph, and when the vector analysis result of the main transformer fault oscillograph is judged to be consistent with the preset regulation requirement, determining that the oscillograph is connected into a secondary winding of a main transformer high-voltage side current transformer and a secondary winding of a main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at the two sides of the transformer are correctly set;
step S3, after the current secondary side equipment is connected with a secondary winding of a main transformer high-voltage side current transformer and a secondary winding of a main transformer low-voltage side current transformer, obtaining corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data on the current secondary side equipment, and carrying out vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data obtained by the current secondary side equipment to obtain a vector analysis result of the current secondary side equipment;
step S4, if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the main transformer fault recording chart, the polarity of the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer accessed by the current secondary side equipment are determined to be correct; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
In step S1, when the engineering work is performed, after the transformer is loaded, a main transformer fault recording diagram is obtained by manually starting the wave recorder or manually starting the wave recorder, so as to ensure that the polarity of the current transformer can be identified when the power grid is operated safely. The main transformer fault recording diagram comprises, but is not limited to, a main transformer high-voltage side three-phase current waveform, a main transformer low-voltage side three-phase current waveform, a main transformer high-voltage side three-phase voltage waveform, a main transformer low-voltage side three-phase voltage waveform and the like.
In step S2, the bus voltage may be extracted, and vector analysis may be performed on the magnitude and direction of the secondary current of the current transformer on the main transformer fault recording diagram with the bus voltage as a reference, for example, the time when the phase angle of a certain phase voltage waveform in ABC is 0 is used as a reference time, the phase current amplitude and the phase angle of each of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform at the reference time are subjected to vector analysis, and the vector analysis is presented as a vector diagram. Of course, the vector analysis of the amplitude and phase angle of each phase current of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform at the reference time can be realized by directly taking the time when a certain phase zero crossing point occurs in the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform as the reference time on a main transformer fault recording chart. It should be noted that the reference or reference time of the vector analysis is not limited to the above-described modes.
It can be known from the transformer basic theory that, as shown in fig. 2, the phase difference of the current in-phase current at the two sides of the Yd11 (or YNd11) wiring transformer Yd is 150 degrees, so as to obtain the vector diagram at the right side of fig. 2, that is, the vector diagram is the analysis result required by the preset regulation.
Therefore, the vector analysis result of the main transformer fault recording diagram is compared with the preset regulation requirement, namely the vector diagram of the main transformer fault recording diagram is compared with the vector diagram on the right side of the diagram 2, if the vector diagram is consistent with the vector diagram on the right side of the diagram 2, the recorder is determined to be connected into the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer on the two sides of the transformer are set correctly. Otherwise, if the two main transformer fault oscillographs are not consistent, the oscillograph is adjusted to be connected with the polarities of the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer until the vector analysis result of the obtained main transformer fault oscillograph is consistent with the preset regulation requirement.
However, when the power grid normally operates and a measurement and control device, a relay protection device and a meter are connected to measure, control or protect a primary system, if the polarity of the current transformer connected to the equipment needs to be judged, the traditional method is to carry out load test on secondary windings of the current transformer one by one.
In order to overcome the defects of the traditional mode, the method only needs to extract the sampling data of the equipment current transformer and adopt the vector analysis method in the step S2 to obtain a corresponding vector analysis result, and then the obtained vector analysis result is compared with the vector analysis result of the main transformer fault oscillogram when the polarity access is correct in the step S2, so that the correctness of the polarity of the equipment access current transformer can be quickly judged.
Therefore, in step S3, after the current secondary side device is connected to the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer, the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data (such as the magnitude and phase angle of the three-phase current sampled by the current transformer on the secondary device; and the magnitude and phase angle of the three-phase voltage directly reflected on the secondary device) of the current secondary side device are obtained on the current secondary side device through the network, the monitoring background, the device display, the printing and other forms, and the same vector analysis method is adopted in step S2 to directly perform vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data obtained by the current secondary side device, so; wherein, the current secondary side equipment is one of a relay protection device, a measurement and control device and a meter.
In step S4, if the vector analysis result of the current secondary side device is consistent with the vector analysis result of the main transformer fault recording graph, determining that the polarity of the secondary winding of the current secondary side device connected to the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are correct; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
It should be noted that, after the polarity error of the secondary winding of the current secondary side device connected to the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer is identified, the polarity of the secondary winding of the current secondary side device connected to the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer is adjusted according to the polarity of the secondary winding of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer connected to the wave recorder.
As shown in fig. 3 and fig. 4, an application scenario of the method for identifying the polarity of a current transformer provided in the embodiment of the present invention is further explained by taking test data of an actual main transformer of a certain transformer substation after being loaded as an example:
in fig. 3, the high voltage side of the main transformer is 110kV, the low voltage side of the main transformer is 10kV, at this time, the 110kV bus 1M of the high voltage side of the main transformer and the 10kV bus 2M of the low voltage side of the main transformer are connected through a current transformer, and the setting mode that the polarity of the current transformer is close to the bus end is determined according to the current flowing to the 10kV side of the main transformer from the high voltage side of the main transformer. At the moment, the oscillograph is connected to a secondary winding of a 110kV current transformer at the high-voltage side of the main transformer and a secondary winding of a 10kV current transformer at the low-voltage side of the main transformer.
The main transformer high-low voltage side current data are obtained from the wave recorder by taking 110kV 1M voltage as a reference, and specifically comprise that channels 33, 34 and 35 are main transformer high-voltage side three-phase current data respectively, and channels 45, 46 and 47 are main transformer low-voltage side three-phase current data respectively, as shown in the following table 1.
TABLE 1
By means of vector analysis, the amplitude and phase angle of each phase current of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform at a reference moment are subjected to vector analysis by taking the bus voltage as a reference, and are displayed by a vector diagram, as shown in fig. 4.
Considering that the high-voltage side CT polarity of the transformer substation faces to a 110kV bus 1M, and the low-voltage side CT polarity faces to a 10kV bus 2M, the current of the transformer two-side secondary current, the same phase and the low-voltage side secondary current collected by each relay protection, measurement and control device in the transformer substation lags behind the current of the high-voltage side by 150 degrees, such as IaLLags behind IAH150°
By comparing the vector diagrams in fig. 4 and fig. 2, the data of the fault recording diagram is analyzed to be consistent with the data of the theoretical analysis vector diagram, so that the polarity of the current transformer of the fault recording group can be judged to meet the regulation requirement, that is, the polarity of the secondary winding of the current transformer of the main transformer high-voltage side 110kV and the secondary winding of the current transformer of the main transformer low-voltage side 10kV connected to the wave recorder is correct, and the polarity of the secondary winding of the current transformer of the main transformer high-voltage side 110kV and the polarity of the secondary winding of the current transformer of the main transformer low-voltage.
At the moment, the three-phase voltage sampling data of the main transformer high-voltage side three-phase current and the three-phase voltage sampling data of the main transformer low-voltage side three-phase current are obtained on a liquid crystal display screen of the relay protection device, then the vector analysis is carried out on the three-phase voltage data of the main transformer high-voltage side and the three-phase voltage data of the main transformer low-voltage side three-phase current of the relay protection device, and a vector analysis result graph similar to that shown in fig. 4.
Comparing the vector analysis result graph of the relay protection device with the vector analysis result graph of the fault oscillograph in FIG. 4, and if the vector analysis result graph is consistent with the vector analysis result graph of the fault oscillograph in FIG. 4, indicating that the polarity of the secondary winding of the 110kV current transformer connected to the high-voltage side of the main transformer and the polarity of the secondary winding of the 10kV current transformer connected to the low-voltage side of the main transformer of the relay protection device; otherwise, the access error is indicated, and the polarities of the secondary winding of the 110kV current transformer at the main transformer high-voltage side and the secondary winding of the 10kV current transformer at the main transformer low-voltage side of the access protection device are adjusted again according to the polarity of the secondary winding of the access oscillograph, so that the access polarity of the current transformer does not need to be tested repeatedly for the relay protection device.
As shown in fig. 5, in an embodiment of the present invention, a polarity identification system for a current transformer is provided, including:
the oscillograph access data acquisition unit 110 is used for acquiring a main transformer fault oscillograph generated by the oscillograph when a transformer operates with load after a technical improvement project of a power grid system is put into operation; wherein, a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform are formed on the main transformer fault recording chart;
the oscillograph access data analysis and polarity determination unit 120 is used for carrying out vector analysis on the phase current amplitude and the phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform in the main transformer fault oscillograph, and when the vector analysis result of the main transformer fault oscillograph obtained by determination is consistent with the preset regulation requirement, the oscillograph is determined to be accessed into the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at the two sides of the transformer are correctly set;
the secondary side equipment access data acquisition and analysis unit 130 is used for acquiring corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data on the current secondary side equipment after the current secondary side equipment is accessed into a main transformer high-voltage side current transformer secondary winding and a main transformer low-voltage side current transformer secondary winding, and performing vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data acquired by the current secondary side equipment to acquire a vector analysis result of the current secondary side equipment;
the secondary side equipment access polarity identification unit 140 is used for determining that the polarity of the secondary winding of the current secondary side equipment access main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are correct if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the main transformer fault recording chart; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
Wherein, still include: the oscillograph is connected to a polarity adjusting unit 150;
and the wave recorder is connected with the polarity adjusting unit and used for adjusting the polarity of the wave recorder connected with the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer until the vector analysis result of the obtained main transformer fault wave recording chart is consistent with the preset regulation requirement if the vector analysis result of the obtained main transformer fault wave recording chart is judged to be inconsistent with the preset regulation requirement.
Wherein, still include: the secondary side device is connected to the polarity adjusting unit 160;
and the secondary side equipment is connected with a polarity adjusting unit and used for adjusting the polarity of the secondary winding of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer according to the polarity of the secondary winding of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer accessed by the oscillograph after the polarity error of the secondary winding of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer is identified.
Wherein, the current secondary side equipment is one of a relay protection device, a measurement and control device and a meter.
The embodiment of the invention has the following beneficial effects:
after the project of power grid technical improvement is completed, vector analysis results obtained by analyzing the current amplitude and the phase angle of three-phase current waveforms at the high-low voltage side of a main transformer fault oscillograph on an oscillograph are compared with preset regulation requirements to judge the polarity of the current transformer at the high-low voltage side of the main transformer and the polarity of a secondary winding of the oscillograph accessed to the current transformer, and on the premise of judging the polarity to be correct, the vector analysis results of the main transformer fault oscillograph are used as a reference object, the reference comparison is carried out by using the current amplitude and the phase angle analysis results after the current secondary equipment is accessed to quickly judge the correctness of the access polarity of the current secondary equipment, and the access polarity of the oscillograph is used as an alteration scheme to carry out adjustment when the access is wrong, so that the problem of the access polarity of the current transformer does not need to be tested repeatedly under the condition of equipment transformation, the problem of misjudgment and low efficiency caused by a load tester in the prior art can be solved, personal errors are avoided, existing equipment in a station is utilized, dependence on the load tester is eliminated, the instrument cost is saved, the polarity judgment correctness and efficiency of the current transformer are improved, and the safe operation of a power grid is ensured.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (9)
1. A current transformer polarity identification method is characterized by comprising the following steps:
s1, after the technical improvement project of the power grid system is put into operation, acquiring a main transformer fault recording chart generated by a recorder when the transformer runs with load; wherein, a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform are formed on the main transformer fault recording chart;
step S2, carrying out vector analysis on the amplitude and phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform in the main transformer fault oscillograph, and when the vector analysis result of the main transformer fault oscillograph is judged to be consistent with the preset regulation requirement, determining that the oscillograph is connected into a secondary winding of a main transformer high-voltage side current transformer and a secondary winding of a main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at the two sides of the transformer are correctly set;
step S3, after the current secondary side equipment is connected with a secondary winding of a main transformer high-voltage side current transformer and a secondary winding of a main transformer low-voltage side current transformer, obtaining corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data on the current secondary side equipment, and carrying out vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data obtained by the current secondary side equipment to obtain a vector analysis result of the current secondary side equipment;
step S4, if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the main transformer fault recording chart, the polarity of the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer accessed by the current secondary side equipment are determined to be correct; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
2. The current transformer polarity identification method of claim 1, wherein the method further comprises:
and if the vector analysis result of the obtained main transformer fault recording diagram is judged to be inconsistent with the preset regulation requirement, the polarity of the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer accessed by the oscillograph are adjusted until the vector analysis result of the obtained main transformer fault recording diagram is consistent with the preset regulation requirement.
3. The current transformer polarity identification method of claim 1, wherein the method further comprises:
after the polarity errors of the secondary windings of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer are identified, the polarities of the secondary windings of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer are adjusted according to the polarities of the secondary windings of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer accessed by the oscillograph.
4. The method for identifying the polarity of the current transformer according to claim 1, wherein any vector analysis result is obtained by using a time point at which a phase angle of a phase voltage waveform of a certain phase in ABC is 0 as a reference time point, and performing vector analysis on the amplitude and the phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform at the reference time point and displaying the phase amplitude and the phase angle in a vector diagram.
5. The method for identifying the polarity of the current transformer according to claim 1, wherein the current secondary-side device is one of a relay protection device, a measurement and control device and a meter.
6. A current transformer polarity identification system, comprising:
the wave recorder access data acquisition unit is used for acquiring a main transformer fault wave recording diagram generated by the wave recorder when the transformer runs with load after the technical improvement project of the power grid system is put into operation; wherein, a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform are formed on the main transformer fault recording chart;
the wave recorder access data analysis and polarity determination unit is used for carrying out vector analysis on the phase current amplitude and the phase angle of each phase of the main transformer high-voltage side three-phase current waveform and the main transformer low-voltage side three-phase current waveform in the main transformer fault wave recording diagram, and when the vector analysis result of the main transformer fault wave recording diagram is determined to be consistent with the preset regulation requirement, the wave recorder is determined to be accessed to the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at the two sides of the transformer are correctly set;
the secondary side equipment access data acquisition and analysis unit is used for obtaining corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data on the current secondary side equipment after the current secondary side equipment is accessed into a main transformer high-voltage side current transformer secondary winding and a main transformer low-voltage side current transformer secondary winding, and carrying out vector analysis on the main transformer high-voltage side three-phase current voltage data and the main transformer low-voltage side three-phase current voltage data obtained by the current secondary side equipment to obtain a vector analysis result of the current secondary side equipment;
the secondary side equipment access polarity identification unit is used for determining that the polarity of the secondary winding of the current secondary side equipment access main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are correct if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the main transformer fault recording chart; and otherwise, determining that the polarity of the secondary side equipment accessed to the secondary winding of the main transformer high-voltage side current transformer and the polarity of the secondary winding of the main transformer low-voltage side current transformer are wrong.
7. The current transformer polarity identification system of claim 6, further comprising: the oscillograph is connected with a polarity adjusting unit;
and the wave recorder is connected with the polarity adjusting unit and used for adjusting the polarity of the wave recorder connected with the secondary winding of the main transformer high-voltage side current transformer and the secondary winding of the main transformer low-voltage side current transformer until the vector analysis result of the obtained main transformer fault wave recording chart is consistent with the preset regulation requirement if the vector analysis result of the obtained main transformer fault wave recording chart is judged to be inconsistent with the preset regulation requirement.
8. The current transformer polarity identification system of claim 6, further comprising: the secondary side equipment is connected with a polarity adjusting unit;
and the secondary side equipment is connected with a polarity adjusting unit and used for adjusting the polarity of the secondary winding of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer according to the polarity of the secondary winding of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer accessed by the oscillograph after the polarity error of the secondary winding of the current secondary side equipment connected with the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer is identified.
9. The system for identifying polarity of current transformer as claimed in claim 6, wherein said current secondary side device is one of relay protection device, measurement and control device and meter.
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