CN112083372B - Polarity identification method and system for current transformer - Google Patents
Polarity identification method and system for current transformer Download PDFInfo
- Publication number
- CN112083372B CN112083372B CN202010846420.7A CN202010846420A CN112083372B CN 112083372 B CN112083372 B CN 112083372B CN 202010846420 A CN202010846420 A CN 202010846420A CN 112083372 B CN112083372 B CN 112083372B
- Authority
- CN
- China
- Prior art keywords
- current
- main transformer
- transformer
- voltage side
- polarity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 114
- 238000004458 analytical method Methods 0.000 claims abstract description 95
- 238000010586 diagram Methods 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 8
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000009466 transformation Effects 0.000 abstract description 7
- 238000005070 sampling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a polarity identification method of a current transformer, which comprises the steps of obtaining a main transformer fault record chart generated by a recorder when a transformer runs under load; carrying out vector analysis on three-phase current waveforms of the high-voltage side and the low-voltage side of the main transformer in the main transformer fault oscillogram, wherein the obtained vector analysis result is consistent with the requirement of a preset rule, and the current transformer of the high-voltage side and the low-voltage side of the main transformer is determined to have correct polarity and the oscillograph is correctly connected; after the current secondary side equipment is connected with the secondary winding of the main transformer high-low voltage side current transformer, vector analysis is carried out on the three-phase current voltage data of the main transformer high-low voltage side of the current secondary side equipment, and a corresponding vector analysis result is obtained; if the vector analysis results of the current secondary side equipment and the main transformer fault wave-recording diagram are consistent, the current secondary side equipment is judged to have correct access polarity; otherwise, the error occurs. The invention can solve the problems of misjudgment and low efficiency caused by the existing on-load tester without repeatedly testing the polarity of the current transformer under the condition of equipment transformation or replacement.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a polarity identification method and system for 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 in dry and poor, 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 is isolated by utilizing a current transformer, and the secondary relay protection device and the measuring instrument can safely and accurately acquire current information of an electric primary loop.
The current transformer is used for changing 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 any one of the leading-out terminals is wrong, the phase of the secondary current can be changed by 180 degrees. When the polarity of the current transformer is wrong, the differential protection in the relay protection device is refused or is wrongly operated, so that the serious consequences such as unstable disconnection of the system or wrong operation of the AVC and AGC system are caused. Therefore, it is necessary to accurately identify the polarity of the current transformer so as to improve the safety of the operation of the power grid.
In the prior art, the polarity of the current transformer is identified through the on-load tester, but the method is easy to cause misjudgment and has low efficiency, and especially under the condition that the workload of secondary equipment transformation is suddenly increased, such as protection replacement, primary equipment transformation, transformer substation comprehensive self-transformation 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 factors such as the quality of the on-load tester, the use method and the like.
Therefore, there is a need for a polarity identification method for a current transformer, which does not need to repeatedly test the polarity of the current transformer under the condition of equipment transformation or replacement, thereby overcoming the problems of misjudgment and low efficiency caused by a load tester in the prior art, improving the accuracy and efficiency of polarity judgment of the current transformer, ensuring the safe operation of a power grid, fully utilizing the existing equipment in a station, getting rid of the dependence on the load tester, and saving the instrument cost.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a polarity identification method for a current transformer, which is capable of solving the problems of misjudgment and low efficiency caused by a load tester in the prior art by repeatedly testing the polarity of the current transformer under the condition of equipment transformation or replacement, improving the accuracy and efficiency of polarity judgment of the current transformer, ensuring the safe operation of a power grid, fully utilizing the existing equipment in a station, getting rid of the dependence on the load tester, and saving the instrument cost.
In order to solve the technical problems, the embodiment of the invention provides a polarity identification method of a current transformer, which comprises the following steps:
step S1, after a technical improvement project of a power grid system is completed, acquiring a main transformer fault wave recording diagram generated by a wave recorder when a transformer runs with load; the main transformer fault oscillogram is provided with a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform;
s2, carrying out vector analysis on each phase of current amplitudes and phase angles of a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform in the main transformer fault oscillogram, and when the vector analysis result of the obtained main transformer fault oscillogram is judged to be consistent with the preset regulation requirement, determining that the polarity of the recorder connected to a secondary winding of the main transformer high-voltage side current transformer and a secondary winding of the main transformer low-voltage side current transformer is correct, and setting the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at two sides of the transformer to be correct;
s3, after the current secondary side equipment is 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, corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data are obtained on the current secondary side equipment, vector analysis is carried out 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, and a vector analysis result of the current secondary side equipment is obtained;
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 record chart, the current secondary side equipment is determined to be 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 in correct polarity; otherwise, the polarity error of the current secondary side equipment connected to the secondary winding of the main transformer high-voltage side current transformer and the polarity error of the current secondary winding of the main transformer low-voltage side current transformer are determined.
Wherein the method further comprises:
and if the vector analysis result of the obtained main transformer fault oscillogram is inconsistent with the preset regulation requirement, the polarities of the secondary windings of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer which are connected with the oscillograph are adjusted until the vector analysis result of the obtained main transformer fault oscillogram is consistent with the preset regulation requirement.
Wherein the method further comprises:
and after the polarity errors of the current secondary side equipment 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 are confirmed, the polarity of the current secondary side equipment 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 is adjusted according to the polarity of the 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.
And each vector analysis result is that the moment when the phase angle of a certain phase voltage waveform in ABC is 0 is taken as a reference moment, and vector analysis is carried out on the 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 at the reference moment respectively, and the vector analysis results are displayed in 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 invention also provides a polarity recognition system of the current transformer, which comprises the following steps:
the recorder is connected with the data acquisition unit and is used for acquiring a main transformer fault record chart generated by the recorder when the transformer runs under load after the project of technical improvement of the power grid system is completed; the main transformer fault oscillogram is provided with a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform;
the wave recorder is connected to the data analysis and polarity judgment unit and is used for carrying out vector analysis on each phase of current amplitude and phase angle 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 obtained main transformer fault wave recording diagram is judged to be consistent with the preset regulation requirement, the polarity of the secondary winding of the main transformer high-voltage side current transformer connected to the wave recorder and the polarity of the secondary winding of the main transformer low-voltage side current transformer are judged to be correct, 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;
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 to the main transformer high-voltage side current transformer secondary winding and the 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 is connected to the polarity identification unit and is used for determining that the polarity of the secondary winding of the primary transformer high-voltage side current transformer and the polarity of the secondary winding of the primary transformer low-voltage side current transformer connected to the current secondary side equipment are correct if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the primary transformer fault record chart; otherwise, the polarity error of the current secondary side equipment connected to the secondary winding of the main transformer high-voltage side current transformer and the polarity error of the current secondary winding of the main transformer low-voltage side current transformer are determined.
Wherein, still include: the recorder is connected with a polarity adjusting unit;
and the recorder is connected to the polarity adjustment unit and is used for adjusting the polarity of the recorder 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 until the vector analysis result of the obtained main transformer fault oscillogram is consistent with the preset regulation requirement if the vector analysis result of the obtained main transformer fault oscillogram is not consistent with the preset regulation requirement.
Wherein, still include: the secondary side equipment is connected with a polarity adjusting unit;
the secondary side equipment is connected to the polarity adjustment unit, and is used for adjusting the polarity of the current secondary side equipment 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 according to the polarity of the recorder 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 after the polarity error of the current secondary side equipment 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 is confirmed.
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 power grid technical improvement project is completed, the vector analysis results obtained by analyzing the current amplitude and the phase angle of the main transformer high-low voltage side three-phase current waveform of the main transformer fault record chart on the wave recorder are compared with the preset regulation requirements to judge the polarity of the main transformer high-low voltage side current transformer and the correctness of the polarity of the secondary winding of the current transformer connected with the wave recorder, and on the premise that the judgment polarities are correct, the vector analysis results of the main transformer fault record chart are used as reference objects, the vector analysis results obtained by analyzing the current amplitude and the phase angle generated after the current secondary equipment is connected are used for reference comparison, so that the correctness of the current secondary equipment is rapidly judged, and the polarity of the wave recorder is used as a change scheme for adjustment when the current secondary equipment is connected in error, thereby repeatedly testing the polarity of the current transformer under the condition of no need of equipment transformation or replacement, avoiding the problem of misjudgment and low efficiency caused by a load tester in the prior art, avoiding the dependence on the load tester, saving the cost of the current transformer, improving the accuracy of the polarity judgment of the current transformer and the power grid, and ensuring the safety of the power grid.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
Fig. 1 is a flowchart of a polarity recognition method of a current transformer according to an embodiment of the present invention;
FIG. 2 is a diagram showing a phase relationship of a secondary side current of an YN d11 wiring transformer under normal conditions in a polarity recognition method of a current transformer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of connection between a transformer and 110kV bus side and 10kV bus in an application scenario of a polarity recognition method of a current transformer according to an embodiment of the present invention;
FIG. 4 is a graph of the vector analysis result obtained after the vector analysis of the fault log map of the main transformer generated by the recorder during the load operation of the transformer in FIG. 3;
fig. 5 is a schematic diagram of a polarity recognition structure of a current transformer according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, in an embodiment of the present invention, a method for identifying the polarity of a current transformer is provided, where the method includes the following steps:
step S1, after a technical improvement project of a power grid system is completed, acquiring a main transformer fault wave recording diagram generated by a wave recorder when a transformer runs with load; the main transformer fault oscillogram is provided with a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform;
s2, carrying out vector analysis on each phase of current amplitudes and phase angles of a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform in the main transformer fault oscillogram, and when the vector analysis result of the obtained main transformer fault oscillogram is judged to be consistent with the preset regulation requirement, determining that the polarity of the recorder connected to a secondary winding of the main transformer high-voltage side current transformer and a secondary winding of the main transformer low-voltage side current transformer is correct, and setting the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at two sides of the transformer to be correct;
s3, after the current secondary side equipment is 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, corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data are obtained on the current secondary side equipment, vector analysis is carried out 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, and a vector analysis result of the current secondary side equipment is obtained;
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 record chart, the current secondary side equipment is determined to be 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 in correct polarity; otherwise, the polarity error of the current secondary side equipment connected to the secondary winding of the main transformer high-voltage side current transformer and the polarity error of the current secondary winding of the main transformer low-voltage side current transformer are determined.
In step S1, after the transformer is loaded when the engineering is put into operation, the main transformer fault wave recording diagram is obtained by manually starting the wave recorder or manually starting the wave recorder, so that the polarity identification of the current transformer can be ensured under the condition of safe operation of the power grid. The main transformer fault oscillogram 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 oscillogram based on the bus voltage, for example, the moment when the phase angle of a certain phase voltage waveform in ABC is 0 is taken as a reference moment, vector analysis may be performed on the current amplitudes and phase angles 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 the vector analysis may be performed on the vector diagram. Of course, the main transformer fault wave recording diagram can directly take the occurrence time of a zero crossing point of a certain phase of 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, so that vector analysis can be carried out on the 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 at the reference time. It should be noted that the benchmarks or reference moments of vector analysis are not limited to just the several ways described above.
As can be seen from the basic theory of the transformer, as shown in FIG. 2, the phase difference of the current in-phase current at two sides of the Yd11 (or YNd 11) wiring transformer Yd is 150 degrees, so that a vector diagram at the right side of FIG. 2 is obtained, namely the vector diagram is an analysis result required by a preset rule.
Therefore, the vector analysis result of the main transformer fault record chart is compared with the preset rule requirement, namely, the vector chart of the main transformer fault record chart is compared with the vector chart on the right side of fig. 2, if the two are consistent, the polarity of the recorder 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 is determined to be correct, 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 main transformer fault record graphs are inconsistent, the polarities of the secondary windings of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer which are connected with the recorder are adjusted until the vector analysis result of the obtained main transformer fault record graphs is consistent with the preset regulation requirement.
However, when the power grid normally operates and is connected with a measurement and control device, a relay protection device and a meter to measure, control or protect a primary system, if the polarity of the device connected with the current transformer needs to be judged, the secondary winding of the current transformer is subjected to on-load test one by one in a traditional mode.
In order to overcome the defects of the traditional mode, the method only needs to extract the sampling data of the current transformer of the equipment and adopt the vector analysis method in the step S2 to obtain the corresponding vector analysis result, and then further compares the obtained vector analysis result with the vector analysis result of the main transformer fault record chart when the polarity access in the step S2 is correct, so that the correctness of the polarity of the current transformer accessed by the equipment can be rapidly 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 the phase angle of the three-phase current sampled by the current transformer on the secondary device; such as the magnitude and the phase angle of the three-phase voltage directly reflected by the secondary device) of the current secondary side device are obtained on the current secondary side device through the modes of network, monitoring background, device display, printing and the like, and the same vector analysis method in step S2 is adopted 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 to obtain the vector analysis result of the current secondary side device; 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 record chart, determining that the polarity of the current secondary side device 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 is correct; otherwise, the polarity error of the current secondary side equipment connected to the secondary winding of the main transformer high-voltage side current transformer and the polarity error of the current secondary winding of the main transformer low-voltage side current transformer are determined.
It should be noted that, after the polarity errors of the current secondary side equipment 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 are confirmed, the polarity of the current secondary side equipment 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 is adjusted according to the polarity of the recorder 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.
As shown in fig. 3 and fig. 4, taking test data after a certain transformer substation actual main transformer has load as an example, an application scenario of a current transformer polarity identification method provided in an embodiment of the present invention is further described:
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 arrangement mode of the polarity of the current transformer close to the bus terminal is determined according to the current flowing to the 10kV of the high-voltage side of the main transformer. At the moment, the oscillograph is connected to the secondary winding of the 110kV current transformer at the high-voltage side of the main transformer and the secondary winding of the 10kV current transformer at the low-voltage side of the main transformer.
The main transformer high-low voltage side current data is obtained from the recorder by taking 110kV 1M voltage as a reference, and specifically comprises three-phase current data of main transformer high voltage side of channels 33, 34 and 35 and three-phase current data of main transformer low voltage side of channels 45, 46 and 47 respectively, as shown in the following table 1.
TABLE 1
By vector analysis, the bus voltage is used as a reference, and vector analysis is performed on the 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 at the reference time, and the vector analysis is shown by a vector diagram, as shown in fig. 4.
Considering that the CT polarity of the high-voltage side of the transformer substation faces the 110kV bus 1M and the CT polarity of the low-voltage side faces the 10kV bus 2M, the secondary current of the two sides of the transformer collected by each relay protection and measurement and control device in the normal condition transformer substation is lagged by 150 DEG behind the current of the high-voltage side, such as I aL Lag behind I AH 150°
By comparing the vector diagrams of fig. 4 and fig. 2, the data of the fault wave recording diagram are analyzed and known to be consistent with the data of the theoretical analysis vector diagram, so that the polarity of the fault wave recording group current transformer can be judged to meet the rule requirement, namely, the polarity of the secondary winding of the main transformer high-voltage side 110kV current transformer and the polarity of the secondary winding of the main transformer low-voltage side 10kV current transformer are correct, and the polarities of the main transformer high-voltage side 110kV current transformer and the main transformer low-voltage side 10kV current transformer on two sides of the transformer are correct.
At this time, main transformer high-voltage side three-phase current and three-phase voltage sampling data and main transformer low-voltage side three-phase current and three-phase voltage sampling data are obtained on a liquid crystal display screen of the relay protection device, and then vector analysis is carried out on the main transformer high-voltage side three-phase current and voltage data and the main transformer low-voltage side three-phase current and voltage data of the relay protection device, so that a vector analysis result diagram similar to that shown in fig. 4 is generated.
Comparing the vector analysis result diagram of the relay protection device with the vector analysis result diagram of the fault recorder of fig. 4, and if the vector analysis result diagram is consistent with the vector analysis result diagram of the fault recorder of fig. 4, indicating that the polarity of the relay protection device connected to the secondary winding of the main transformer high-voltage side 110kV current transformer and the polarity of the relay protection device connected to the secondary winding of the main transformer low-voltage side 10kV current transformer are correct; otherwise, the connection error is indicated, and the polarities of the secondary winding of the main transformer high-voltage side 110kV current transformer and the secondary winding of the main transformer low-voltage side 10kV current transformer connected to the protection device are adjusted again according to the polarities of the secondary windings connected to the recorder, so that the repeated test of the connection polarities of the current transformers to the relay protection device is not needed.
As shown in fig. 5, in an embodiment of the present invention, a polarity recognition system for a current transformer is provided, including:
the recorder is connected to the data acquisition unit 110, and is configured to acquire a main transformer fault record chart generated by the recorder when the transformer is in load operation after the technical improvement project of the power grid system is completed; the main transformer fault oscillogram is provided with a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform;
the recorder access data analysis and polarity determination unit 120 is configured to perform vector analysis on each phase of current amplitudes and phase angles of a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform in the main transformer fault record chart, and determine that the polarity of the recorder access main transformer high-voltage side current transformer secondary winding and the main transformer low-voltage side current transformer secondary winding is correct when it is determined that the vector analysis result of the obtained main transformer fault record chart is consistent with a preset regulation requirement, and the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer on both sides of the transformer are both set correctly;
the secondary side device access data acquisition and analysis unit 130 is configured to obtain 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 device after the current secondary side device is accessed to the main transformer high-voltage side current transformer secondary winding and the main transformer low-voltage side current transformer secondary winding, and 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 to obtain a vector analysis result of the current secondary side device;
the secondary side device access polarity identification unit 140 is configured to determine that the polarity of the secondary winding of the primary transformer high-voltage side current transformer and the polarity of the secondary winding of the primary transformer low-voltage side current transformer are correct if the vector analysis result of the current secondary side device and the vector analysis result of the primary transformer fault record chart are consistent; otherwise, the polarity error of the current secondary side equipment connected to the secondary winding of the main transformer high-voltage side current transformer and the polarity error of the current secondary winding of the main transformer low-voltage side current transformer are determined.
Wherein, still include: the recorder is connected to the polarity adjustment unit 150;
and the recorder is connected to the polarity adjustment unit and is used for adjusting the polarity of the recorder 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 until the vector analysis result of the obtained main transformer fault oscillogram is consistent with the preset regulation requirement if the vector analysis result of the obtained main transformer fault oscillogram is not consistent with the preset regulation requirement.
Wherein, still include: the secondary side equipment is connected to the polarity adjustment unit 160;
the secondary side equipment is connected to the polarity adjustment unit, and is used for adjusting the polarity of the current secondary side equipment 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 according to the polarity of the recorder 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 after the polarity error of the current secondary side equipment 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 is confirmed.
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 power grid technical improvement project is completed, the vector analysis results obtained by analyzing the current amplitude and the phase angle of the main transformer high-low voltage side three-phase current waveform of the main transformer fault record chart on the wave recorder are compared with the preset regulation requirements to judge the polarity of the main transformer high-low voltage side current transformer and the correctness of the polarity of the secondary winding of the current transformer connected with the wave recorder, and on the premise that the judgment polarities are correct, the vector analysis results of the main transformer fault record chart are used as reference objects, the vector analysis results obtained by analyzing the current amplitude and the phase angle generated after the current secondary equipment is connected are used for reference comparison, so that the correctness of the current secondary equipment is rapidly judged, and the polarity of the wave recorder is used as a change scheme for adjustment when the current secondary equipment is connected in error, thereby repeatedly testing the polarity of the current transformer under the condition of no need of equipment transformation or replacement, avoiding the problem of misjudgment and low efficiency caused by a load tester in the prior art, avoiding the dependence on the load tester, saving the cost of the current transformer, improving the accuracy of the polarity judgment of the current transformer and the power grid, and ensuring the safety of the power grid.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (7)
1. A method for identifying polarity of a current transformer, the method comprising the steps of:
step S1, after a technical improvement project of a power grid system is completed, acquiring a main transformer fault wave recording diagram generated by a wave recorder when a transformer runs with load; the main transformer fault oscillogram is provided with a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform;
s2, carrying out vector analysis on each phase of current amplitudes and phase angles of a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform in the main transformer fault oscillogram, and when the vector analysis result of the obtained main transformer fault oscillogram is judged to be consistent with the preset regulation requirement, determining that the polarity of the recorder connected to a secondary winding of the main transformer high-voltage side current transformer and a secondary winding of the main transformer low-voltage side current transformer is correct, and setting the polarities of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer at two sides of the transformer to be correct;
s3, after the current secondary side equipment is 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, corresponding main transformer high-voltage side three-phase current voltage data and main transformer low-voltage side three-phase current voltage data are obtained on the current secondary side equipment, vector analysis is carried out 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, and a vector analysis result of the current secondary side equipment is obtained;
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 record chart, the current secondary side equipment is determined to be 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 in correct polarity; otherwise, the current secondary side equipment is determined to be connected 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 is wrong;
wherein the method further comprises:
and if the vector analysis result of the obtained main transformer fault oscillogram is inconsistent with the preset regulation requirement, the polarities of the secondary windings of the main transformer high-voltage side current transformer and the main transformer low-voltage side current transformer which are connected with the oscillograph are adjusted until the vector analysis result of the obtained main transformer fault oscillogram is consistent with the preset regulation requirement.
2. The current transformer polarity identification method of claim 1, wherein the method further comprises:
and after the polarity errors of the current secondary side equipment 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 are confirmed, the polarity of the current secondary side equipment 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 is adjusted according to the polarity of the 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.
3. The method for identifying the polarity of the current transformer according to claim 1, wherein any vector analysis result takes a time when a phase angle of a voltage waveform of a certain phase in ABC is 0 as a reference time, and vector analysis is carried out on current amplitudes and phase angles of each phase of a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform at the reference time and the vector analysis result is displayed in a vector diagram.
4. The method of claim 1, wherein the current secondary device is one of a relay protection device, a measurement and control device, and a meter.
5. A current transformer polarity identification system, comprising:
the recorder is connected with the data acquisition unit and is used for acquiring a main transformer fault record chart generated by the recorder when the transformer runs under load after the project of technical improvement of the power grid system is completed; the main transformer fault oscillogram is provided with a main transformer high-voltage side three-phase current waveform and a main transformer low-voltage side three-phase current waveform;
the wave recorder is connected to the data analysis and polarity judgment unit and is used for carrying out vector analysis on each phase of current amplitude and phase angle 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 obtained main transformer fault wave recording diagram is judged to be consistent with the preset regulation requirement, the polarity of the secondary winding of the main transformer high-voltage side current transformer connected to the wave recorder and the polarity of the secondary winding of the main transformer low-voltage side current transformer are judged to be correct, 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;
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 to the main transformer high-voltage side current transformer secondary winding and the 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 is connected to the polarity identification unit and is used for determining that the polarity of the secondary winding of the primary transformer high-voltage side current transformer and the polarity of the secondary winding of the primary transformer low-voltage side current transformer connected to the current secondary side equipment are correct if the vector analysis result of the current secondary side equipment is consistent with the vector analysis result of the primary transformer fault record chart; otherwise, the current secondary side equipment is determined to be connected 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 is wrong;
wherein, still include: the recorder is connected with a polarity adjusting unit;
and the recorder is connected to the polarity adjustment unit and is used for adjusting the polarity of the recorder 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 until the vector analysis result of the obtained main transformer fault oscillogram is consistent with the preset regulation requirement if the vector analysis result of the obtained main transformer fault oscillogram is not consistent with the preset regulation requirement.
6. The current transformer polarity identification system of claim 5, further comprising: the secondary side equipment is connected with a polarity adjusting unit;
the secondary side equipment is connected to the polarity adjustment unit, and is used for adjusting the polarity of the current secondary side equipment 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 according to the polarity of the recorder 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 after the polarity error of the current secondary side equipment 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 is confirmed.
7. The current transformer polarity identification system of claim 5, wherein the current secondary side device is one of a relay protection device, a measurement and control device, and a meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010846420.7A CN112083372B (en) | 2020-08-21 | 2020-08-21 | Polarity identification method and system for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010846420.7A CN112083372B (en) | 2020-08-21 | 2020-08-21 | Polarity identification method and system for current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112083372A CN112083372A (en) | 2020-12-15 |
| CN112083372B true CN112083372B (en) | 2023-12-15 |
Family
ID=73728545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010846420.7A Active CN112083372B (en) | 2020-08-21 | 2020-08-21 | Polarity identification method and system for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112083372B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580020B (en) * | 2020-05-27 | 2022-03-11 | 中国南方电网有限责任公司 | Three-phase split type transformer CT polarity verification method and system |
| CN112946553B (en) * | 2021-01-29 | 2023-04-28 | 南方电网科学研究院有限责任公司 | Online checking method and device for same name end of distribution network |
| CN112965013B (en) * | 2021-03-17 | 2023-01-31 | 国网福建省电力有限公司龙岩供电公司 | Electric power measurement V-V wiring PT secondary reverse polarity judgment device |
| CN114200354B (en) * | 2022-02-16 | 2022-04-19 | 广东电网有限责任公司肇庆供电局 | Zero sequence CT polarity online detection method, system and equipment |
| CN116840748B (en) * | 2023-08-30 | 2023-11-14 | 国网智能电网研究院有限公司 | Polarity detection device and method |
| CN117388575B (en) * | 2023-12-11 | 2024-03-19 | 广东威恒输变电工程有限公司 | Data vector testing method and system for current transformer of power supply and distribution system |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201438212U (en) * | 2009-07-16 | 2010-04-14 | 华东电力试验研究院有限公司 | Electronic current transformer polarity measurement system |
| CN202057747U (en) * | 2011-04-29 | 2011-11-30 | 河南省电力公司鹤壁供电公司 | Intelligent secondary circuit vector analyzer |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN103837795A (en) * | 2014-02-18 | 2014-06-04 | 国网山东省电力公司 | Dispatching end grid fault diagnosis method based on wide-area fault recording information |
| WO2016117781A1 (en) * | 2015-01-20 | 2016-07-28 | 주식회사 신동파워텍 | Two-way measurement device for scott transformer and measuring method in measurement device for scott transformer |
| CN106026021A (en) * | 2016-06-28 | 2016-10-12 | 广东电网有限责任公司佛山供电局 | Method for identifying protective action fault recording graph |
| CN107300684A (en) * | 2017-08-17 | 2017-10-27 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of check method in transformer differential protection secondary loop |
| CN108931754A (en) * | 2018-09-26 | 2018-12-04 | 云南电网有限责任公司电力科学研究院 | A kind of current transformer polarity and secondary winding use detection method with |
| CN109031179A (en) * | 2018-07-04 | 2018-12-18 | 云南电网有限责任公司 | Main transformer CT polarity and protection direction-adaptive method of calibration |
| CN109143143A (en) * | 2018-10-19 | 2019-01-04 | 天生桥二级水力发电有限公司天生桥水力发电总厂 | Transformer substation current transformer secondary side polarity intelligent detection device and method |
| CN109283406A (en) * | 2018-08-13 | 2019-01-29 | 中国南方电网有限责任公司超高压输电公司梧州局 | Current loop based on whole station date comprision monitors system |
| CN110824385A (en) * | 2019-11-22 | 2020-02-21 | 国网福建省电力有限公司 | Transformer system current phasor testing system and method based on low-frequency excitation response |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10191102B2 (en) * | 2015-01-27 | 2019-01-29 | Utility Relay Company | Automatic current transformer polarity correction |
-
2020
- 2020-08-21 CN CN202010846420.7A patent/CN112083372B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201438212U (en) * | 2009-07-16 | 2010-04-14 | 华东电力试验研究院有限公司 | Electronic current transformer polarity measurement system |
| CN202057747U (en) * | 2011-04-29 | 2011-11-30 | 河南省电力公司鹤壁供电公司 | Intelligent secondary circuit vector analyzer |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN103837795A (en) * | 2014-02-18 | 2014-06-04 | 国网山东省电力公司 | Dispatching end grid fault diagnosis method based on wide-area fault recording information |
| WO2016117781A1 (en) * | 2015-01-20 | 2016-07-28 | 주식회사 신동파워텍 | Two-way measurement device for scott transformer and measuring method in measurement device for scott transformer |
| CN106026021A (en) * | 2016-06-28 | 2016-10-12 | 广东电网有限责任公司佛山供电局 | Method for identifying protective action fault recording graph |
| CN107300684A (en) * | 2017-08-17 | 2017-10-27 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of check method in transformer differential protection secondary loop |
| CN109031179A (en) * | 2018-07-04 | 2018-12-18 | 云南电网有限责任公司 | Main transformer CT polarity and protection direction-adaptive method of calibration |
| CN109283406A (en) * | 2018-08-13 | 2019-01-29 | 中国南方电网有限责任公司超高压输电公司梧州局 | Current loop based on whole station date comprision monitors system |
| CN108931754A (en) * | 2018-09-26 | 2018-12-04 | 云南电网有限责任公司电力科学研究院 | A kind of current transformer polarity and secondary winding use detection method with |
| CN109143143A (en) * | 2018-10-19 | 2019-01-04 | 天生桥二级水力发电有限公司天生桥水力发电总厂 | Transformer substation current transformer secondary side polarity intelligent detection device and method |
| CN110824385A (en) * | 2019-11-22 | 2020-02-21 | 国网福建省电力有限公司 | Transformer system current phasor testing system and method based on low-frequency excitation response |
Non-Patent Citations (1)
| Title |
|---|
| 基于主变380V通流的电流互感器极性校验;卢迪勇;《电工电气》;20100915(第09期);第1-4小节 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112083372A (en) | 2020-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112083372B (en) | Polarity identification method and system for current transformer | |
| CN110689252B (en) | Capacitive voltage transformer metering error situation awareness system | |
| EP2680017A1 (en) | A method of early detection of feeder lines with a high-ohm ground fault in compensated power networks | |
| WO2018006876A1 (en) | Capacitive voltage mutual inductor for transient over-voltage monitoring system | |
| CN105785157B (en) | Double main transformer longitudinal differential protection cyclization test methods | |
| CN106990380B (en) | Fault detection method for on-site capacitor voltage transformer | |
| CN102540001A (en) | Method of checking alternating current loop of a 500kV transformer substation through carrying out simulated through-type three-phase short circuit | |
| CN110850352A (en) | Secondary circuit wiring checking method of 10kV voltage transformer | |
| CN113759301A (en) | System and method for detecting secondary circuit wiring of voltage transformer | |
| CN110231533A (en) | Temperature-rise test device and method, storage medium, computer equipment | |
| CN102788902B (en) | High-voltage transmission line power frequency parameter actual measuring device capable of resisting against high-induced voltage interference | |
| CN205656294U (en) | Current transformer error measuring apparatu | |
| Behjat et al. | An experimental approach for investigating low-level interturn winding faults in power transformers | |
| CN117269700A (en) | Voltage transformer insulation defect diagnosis method based on fault wave recording information | |
| CN112379194A (en) | Secondary loop detection method for transformer protection device | |
| CN106199164B (en) | A kind of measurement method of transformer iron core grounding current | |
| CN112798990A (en) | 10kV bus voltage transformer secondary circuit wiring checking method | |
| CN109188334B (en) | Mutual inductor error calibration method and device | |
| CN108776320B (en) | Transformation ratio and polarity detection test method and device for current transformer | |
| CN216285463U (en) | Power flow analyzer for power system | |
| Xu et al. | On-line monitoring of winding deformation of power transformer | |
| CN112415435A (en) | Detection method for secondary loop of parallel reactor protection device | |
| CN114325484A (en) | Method for checking wiring of secondary circuit of voltage transformer of generator | |
| CN113866526A (en) | One-time simulation live test system and method for intelligent substation | |
| CN105467354A (en) | An operation condition examination method for a metering device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |