CN116930848A - Current transformer abnormality monitoring method and related device - Google Patents
Current transformer abnormality monitoring method and related device Download PDFInfo
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- CN116930848A CN116930848A CN202310819923.9A CN202310819923A CN116930848A CN 116930848 A CN116930848 A CN 116930848A CN 202310819923 A CN202310819923 A CN 202310819923A CN 116930848 A CN116930848 A CN 116930848A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000005856 abnormality Effects 0.000 title claims abstract description 33
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 400
- 230000002159 abnormal effect Effects 0.000 claims abstract description 86
- 238000012423 maintenance Methods 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 8
- 238000012806 monitoring device Methods 0.000 claims description 4
- 238000012552 review Methods 0.000 claims description 4
- 238000013024 troubleshooting Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
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- 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
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The embodiment of the application discloses a current transformer abnormality monitoring method and a related device, wherein the method judges whether the secondary winding of the current transformer and an external loop thereof are damaged or not by comparing the current running values of the secondary winding of the current transformer and the external loop with initial values; or by monitoring the data of the voltages to the ground of the secondary winding and the external circuit of the current transformer, judging whether the secondary winding and the external circuit thereof are abnormal according to the judging standard. By the application of the method, the abnormality of the current transformer can be found in advance, so that the operation safety of the current transformer can be greatly improved, and meanwhile, the fault troubleshooting efficiency of operation and maintenance personnel can be effectively improved.
Description
Technical Field
The application relates to the technical field of fault monitoring of current transformers, in particular to a current transformer abnormality monitoring method and a related device.
Background
The current transformer plays a role in monitoring primary current in a power system, and is generally provided with a plurality of secondary windings, and if a single secondary winding fault problem exists in actual operation, abnormal conditions such as virtual connection, broken line and the like of an external loop of the secondary winding of the current transformer are easy to cause the burning of the transformer, tripping of the action of a protection device or abnormal measurement signals. But the secondary operation condition of the current transformer is hidden, and the secondary hidden trouble of the current transformer is difficult to find during normal operation and maintenance.
Therefore, it is desirable to provide a method that can effectively and timely monitor current transformer anomalies.
Disclosure of Invention
The application mainly aims to provide a current transformer abnormality monitoring method, a device, computer equipment and a storage medium, which can solve the problem that potential safety hazards of current transformers in the prior art are difficult to monitor.
To achieve the above object, a first aspect of the present application provides a method for monitoring abnormality of a current transformer, the method comprising:
collecting circuit data of external loops corresponding to all secondary windings of the current transformer in operation; the circuit data are current value or voltage to ground data;
when the circuit data are current values, obtaining current values of external loops corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, obtaining current values of external loops corresponding to target secondary windings, and obtaining a running reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except for the target secondary winding and an initial reference value, wherein the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding;
if the circuit data are the data of the voltage to ground, obtaining the data of the voltage to ground of an external loop corresponding to the secondary winding of the current transformer; and judging whether the voltage of the external circuit corresponding to the secondary winding is abnormally increased or not according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal or not according to the judging result.
With reference to the first aspect, in one possible implementation manner, determining whether an abnormality exists in the secondary winding of the current transformer and an external loop corresponding to the secondary winding according to the magnitude relation between the operation multiple and the initial multiple includes: and if a secondary winding with the difference value of the operation multiple and the initial multiple being larger than a difference value threshold exists, judging that the external loop corresponding to the secondary winding with the difference value of the operation multiple and the initial multiple being larger than the difference value threshold exists abnormal.
With reference to the first aspect, in one possible implementation manner, the determining, according to the magnitude relation between the operation multiple and the initial multiple, whether the secondary winding of the current transformer and the external loop corresponding to the secondary winding are abnormal further includes: and if the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is larger than a difference value threshold, judging that the target secondary winding and an external loop corresponding to the target secondary winding are abnormal.
With reference to the first aspect, in one possible implementation manner, the determining, according to the magnitude relation between the operation multiple and the initial multiple, whether the secondary winding of the current transformer and the external loop corresponding to the secondary winding are abnormal further includes: and if at least two secondary windings exist and the secondary windings of which the difference value between the running multiple and the initial multiple of the external loop corresponding to the secondary windings is larger than a difference threshold value and the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is not larger than the difference threshold value, judging that the whole current transformer is damaged.
With reference to the first aspect, in one possible implementation manner, the determining, according to the voltage data to ground, whether an abnormal voltage rise exists in an external loop corresponding to the secondary winding, to obtain a determination result includes: if the change amount of the data of the external loop corresponding to the secondary winding to the ground voltage is larger than the voltage threshold value within the preset time length, the judgment result is that the voltage of the external loop corresponding to the secondary winding is abnormally increased; if the change amount of the data of the external loop corresponding to the secondary winding to the ground voltage is not larger than the voltage threshold value within the preset time length, the judgment result is that the external loop corresponding to the secondary winding has no abnormal voltage rise.
With reference to the first aspect, in one possible implementation manner, determining, according to the determination result, whether an abnormality exists in the secondary winding of the current transformer and an external loop corresponding to the secondary winding includes: if the judgment result shows that the abnormal voltage rise exists in the external circuit corresponding to the secondary winding, determining that the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal; if the judgment result shows that the external loop corresponding to the secondary winding has no abnormal voltage rise, determining that the secondary winding of the current transformer and the external loop corresponding to the secondary winding have no abnormality.
With reference to the first aspect, in one possible implementation manner, the method further includes: when the secondary windings of the current transformer and the external loop corresponding to the secondary windings are abnormal, current waveforms and ground voltage waveforms of all the secondary windings of the current transformer in a target time period are acquired for maintenance personnel to review and check; the target time period is a time period from a preset time before the abnormal time to the abnormal end time.
With reference to the first aspect, in one possible implementation manner, the method further includes: when the secondary winding of the current transformer and the external loop corresponding to the secondary winding are determined to be abnormal, alarm information of the abnormal secondary winding and the external loop corresponding to the abnormal secondary winding is sent to remind operation and maintenance personnel to check and maintain.
To achieve the above object, a second aspect of the present application provides a current transformer abnormality monitoring device, the device comprising:
and the acquisition module is used for: the circuit data of the external loops corresponding to all secondary windings of the current transformer in operation are collected; the circuit data are current value or voltage to ground data;
a first judging module: when the circuit data are current values, acquiring the current values of the external circuits corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, and acquiring the current values of the external circuits corresponding to the target secondary windings, thereby obtaining a running time reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except for the target secondary winding and an initial reference value, wherein the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding;
and a second judging module: the method comprises the steps of obtaining the ground voltage data of an external loop corresponding to a secondary winding of a current transformer if circuit data are the ground voltage data; and judging whether the external circuit corresponding to the secondary winding has abnormal voltage rise according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding have abnormality according to the judging result.
To achieve the above object, a third aspect of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
collecting circuit data of external loops corresponding to all secondary windings of the current transformer in operation; the circuit data are current value or voltage to ground data;
when the circuit data are current values, obtaining current values of external loops corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, obtaining current values of external loops corresponding to target secondary windings, and obtaining a running reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except for the target secondary winding and an initial reference value, wherein the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding;
if the circuit data are the data of the voltage to ground, obtaining the data of the voltage to ground of an external loop corresponding to the secondary winding of the current transformer; and judging whether the voltage of the external circuit corresponding to the secondary winding is abnormally increased or not according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal or not according to the judging result.
To achieve the above object, a fourth aspect of the present application provides a computer device including a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:
collecting circuit data of external loops corresponding to all secondary windings of the current transformer in operation; the circuit data are current value or voltage to ground data;
when the circuit data are current values, obtaining current values of external loops corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, obtaining current values of external loops corresponding to target secondary windings, and obtaining a running reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except for the target secondary winding and an initial reference value, wherein the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding;
if the circuit data are the data of the voltage to ground, obtaining the data of the voltage to ground of an external loop corresponding to the secondary winding of the current transformer; and judging whether the voltage of the external circuit corresponding to the secondary winding is abnormally increased or not according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal or not according to the judging result.
The embodiment of the application has the following beneficial effects:
the application provides a current transformer abnormality monitoring method, which comprises the steps of acquiring circuit data of an external loop corresponding to all secondary windings of a current transformer in operation, wherein when the circuit data are current values, calculating a first current value corresponding to each secondary winding except a target secondary winding and a multiple of a reference value in operation to obtain an operation multiple corresponding to each secondary winding except the target secondary winding; the method comprises the steps of selecting a target secondary winding as any one of all secondary windings in a current transformer, wherein the selected secondary winding is not changed, a reference value in operation is a current value of the target secondary winding, determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal according to the magnitude relation of an operation multiple and an initial multiple, wherein the initial multiple is a multiple between a second current value of each secondary winding except the target secondary winding and the initial reference value, the second current value is a current value acquired by the current transformer for the external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is a second current value of the target secondary winding. If the circuit data are the data of the voltage to ground, obtaining the data of the voltage to ground of an external loop corresponding to the secondary winding of the current transformer; and judging whether the voltage of the external circuit corresponding to the secondary winding is abnormally increased or not according to the voltage data to the ground, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormally increased or not according to the judging result. In the technical scheme, whether the secondary winding of the current transformer and the external loop of the current transformer are damaged or not is judged through comparison of the current running values of the secondary winding of the current transformer and the external loop and initial values; or by monitoring the data of the voltages to the ground of the secondary winding and the external circuit of the current transformer, judging whether the secondary winding and the external circuit thereof are abnormal or not. By the application of the method, the abnormality of the current transformer can be found in advance, so that the operation safety of the current transformer can be greatly improved, and meanwhile, the fault troubleshooting efficiency of operation and maintenance personnel can be effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic flow chart of a method for monitoring abnormality of a current transformer according to an embodiment of the present application;
FIG. 2 is a block diagram of an abnormality monitoring device for a current transformer according to an embodiment of the present application;
fig. 3 is a block diagram of a computer device in an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, an embodiment of the present application provides a flow chart of a current transformer abnormality monitoring method, which may be executed by a software device, for example, a current transformer abnormality monitoring apparatus, and the method is applicable to all scenes of current transformer abnormality monitoring, as shown in fig. 1, and the specific steps of the method are as follows:
and step S101, collecting circuit data of external loops corresponding to all secondary windings of the current transformer in operation.
In this embodiment, in operation of the current transformer, circuit data of an external circuit (which may be understood as a secondary circuit) corresponding to all secondary windings of the current transformer are obtained in real time, the circuit data may be a current value of the external circuit corresponding to the secondary winding (which may be understood as a current value of a current flowing through the secondary winding and the external circuit corresponding to the secondary winding) or may be ground voltage data of the external circuit corresponding to the secondary winding, in this embodiment, the current transformer abnormality may be determined in parallel by determining a change in the current value of the external circuit corresponding to the secondary winding and a change in the ground voltage data of the external circuit corresponding to the secondary winding, and in a possible implementation manner, only one of the methods may be adopted to determine the current transformer abnormality.
If the circuit data is a current value, the abnormality monitoring of the current transformer can be performed according to the following steps:
and step S201, obtaining current values of external loops corresponding to all secondary windings of the current transformer in operation, and calculating operation multiples corresponding to all secondary windings according to the current values.
And step S202, determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple.
The initial multiple is a multiple between a second current value of each secondary winding except the target secondary winding and an initial reference value, the second current value is a current value acquired for an external loop corresponding to the secondary winding in the current transformer during primary operation, and the initial reference value is a second current value of the target secondary winding.
Firstly, when the current transformer initially operates, collecting current values of external loops corresponding to all secondary windings of the current transformer, recording the collected current values as second current values for convenience of description, selecting any one secondary winding of all secondary windings of the current transformer as a target secondary winding, determining the second current values of the target secondary windings as initial reference values, calculating a multiple B2 between the second current values of all secondary windings except the target secondary windings and the initial reference values, and recording the multiple between the second current values and the initial reference values as initial multiple B2, so that the current transformer can be used for monitoring whether the current transformer is abnormal or not in the subsequent normal operation. The target secondary winding is any one selected from all secondary windings in the current transformer, and the selected secondary winding is not changed.
Wherein, the formula of B2 may be:
specifically, when the current transformer is operated after initial operation, current values of external loops corresponding to all secondary windings are obtained, the current values at this time are recorded as first current values for convenience of description, the current values of external loops corresponding to target secondary windings are obtained, the first current values of the target secondary windings are determined as operation time reference values, a multiple B1 of the first current values corresponding to the secondary windings except the target secondary windings and the operation reference value is calculated, and the multiple between the first current values and the operation time reference values is recorded as an operation multiple B1. Wherein, the formula of B1 can be:
according to the operation multiple between the second current value of each secondary winding except the target secondary winding and the initial reference value and the initial multiple between the second current value of each secondary winding except the target secondary winding and the initial reference value, the abnormal condition of the current transformer is judged, and the abnormal condition is specifically as follows:
and step 301, if a secondary winding with the difference value between the running multiple and the initial multiple being greater than a difference threshold exists, judging that the external loop corresponding to the secondary winding with the difference value between the running multiple and the initial multiple being greater than the difference threshold exists, and the secondary winding with the difference value between the running multiple and the initial multiple being greater than the difference threshold exists.
And step S302, if the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is larger than a difference value threshold, judging that the target secondary winding and an external loop corresponding to the target secondary winding are abnormal.
And step S303, judging that the whole current transformer is damaged if at least two secondary windings and the difference value between the operation multiple and the initial multiple of the external loop corresponding to the secondary windings are larger than a difference threshold value and the difference value between the operation multiple and the initial multiple of all secondary windings except for the target secondary winding is not larger than the difference threshold value.
Setting a difference threshold, wherein the difference threshold R may be an initial multiple of K times, i.e., r=kxb2, for example, K is 3%, and the initial multiple is 10, and if the difference threshold R is 0.3, calculating the difference between the initial multiple and the operation multiple of the outer loop corresponding to each secondary winding except the target secondary winding, determining whether the difference is greater than the difference threshold, and determining the abnormal condition of the current transformer according to the number of secondary windings with the difference greater than the difference threshold. Specifically, if the number of secondary windings whose difference between the running multiple and the initial multiple is greater than the difference threshold is one, it is determined that there is an abnormality in the secondary windings whose difference between the running multiple and the initial multiple is greater than the difference threshold and in the external circuit corresponding to the secondary windings, for example, the secondary windings of the current transformer include the secondary winding 1, the secondary winding 2 and the secondary winding 3 in addition to the target secondary winding, and if only the difference between the running multiple and the initial multiple corresponding to the secondary winding 2 is greater than the difference threshold, it is determined that there is an abnormality in the secondary windings 2 and in the external circuit corresponding to the secondary winding 2.
If the difference between the running multiple and the initial multiple of all secondary windings except the target secondary winding is larger than the difference threshold, determining that the target secondary winding and the external loop corresponding to the target secondary winding are abnormal, for example, the secondary winding of the current transformer is provided with a secondary winding 1, a secondary winding 2 and a secondary winding 3 except the target secondary winding, and if the difference between the running multiple and the initial multiple of the secondary winding 1 is larger than the difference threshold, the difference between the running multiple and the initial multiple of the secondary winding 2 is larger than the difference threshold, and the difference between the running multiple and the initial multiple of the secondary winding 3 is larger than the difference threshold, determining that the external loop corresponding to the target secondary winding and the target secondary winding is abnormal.
If the number of secondary windings with the difference value larger than the difference value threshold exceeds one and the difference between the operation multiple and the initial multiple of all secondary windings except the target secondary winding is not larger than the difference value threshold, the integral damage of the current transformer is judged, for example, the secondary winding of the current transformer is provided with a secondary winding 1, a secondary winding 2 and a secondary winding 3 except the target secondary winding, and if the difference value between the operation multiple corresponding to the secondary winding 1 and the initial multiple is larger than the difference value threshold and the difference value between the operation multiple corresponding to the secondary winding 3 and the initial multiple is larger than the difference value threshold, the integral damage of the current transformer is judged.
The method for monitoring the abnormality of the current transformer according to the current value of the external loop corresponding to the secondary winding is introduced, and the method for monitoring the abnormality of the current transformer when the circuit data is the data of the voltage to ground is introduced, and the steps of the method are as follows:
and S401, acquiring the data of the ground voltage of an external loop corresponding to the secondary winding of the current transformer.
And step S402, determining whether the secondary winding of the current transformer and the external loop are abnormal according to the obtained ground voltage data and the judgment standard.
Specifically, according to the voltage data to the ground, judging whether the external circuit corresponding to the secondary winding has abnormal voltage rise, obtaining a judging result, and according to the judging result, determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding have abnormality. When the current transformer operates, the ground voltage data of an external loop corresponding to a secondary winding of the current transformer is obtained, whether the voltage of the external loop corresponding to the secondary winding is abnormally increased or not is judged according to the ground voltage data, specifically, if the change amount of the ground voltage data of the external loop corresponding to the secondary winding is larger than a voltage threshold value within a preset time period, the judgment result is that the voltage of the external loop corresponding to the secondary winding is abnormally increased, if the change amount of the ground voltage data of the external loop corresponding to the secondary winding is not larger than the voltage threshold value within the preset time period, the judgment result is that the voltage of the external loop corresponding to the secondary winding is not abnormally increased, if the abnormal voltage of the external loop corresponding to the secondary winding is abnormally increased, the secondary winding of the current transformer and the external loop corresponding to the secondary winding are determined, and if the abnormal voltage of the external loop corresponding to the secondary winding is not increased, the secondary winding of the current transformer and the external loop corresponding to the secondary winding are determined to be abnormal. For example, the current transformer comprises a secondary winding 1, a secondary winding 2 and a secondary winding 3, if the difference between the running multiple corresponding to the secondary winding 2 and the initial multiple is greater than a difference threshold, it is determined that the change of the ground voltage data of the secondary winding 2 within a preset duration is greater than the voltage threshold, it is indicated that abnormal voltage rise exists in an external circuit corresponding to the secondary winding 2, and it is determined that the secondary winding 2 and the external circuit corresponding to the secondary winding 2 are abnormal.
In one possible implementation manner, when it is determined that the secondary windings of the current transformer and the external loop corresponding to the secondary windings are abnormal, current waveforms of all the secondary windings of the current transformer and ground voltage waveforms of the external loop of the secondary windings in a target time period are obtained for a maintainer to review and check, wherein the target time period is a time period from a preset time before an abnormal time to an abnormal end time.
In one possible implementation manner, when it is determined that the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal, alarm information of the abnormal secondary winding and the external circuit corresponding to the abnormal secondary winding is sent to remind operation and maintenance personnel to check and maintain.
Based on the method, firstly, current and voltage monitoring and early warning of the secondary part of the current transformer can be realized, the abnormal operation of the secondary part of the current transformer can be early warned in time, and the operation safety of the current transformer is effectively improved. Secondly, the complete record of data when the secondary part of the current transformer operates abnormally can be realized, operation and maintenance personnel can be effectively assisted to rapidly analyze faults or protection action reasons, and powerful auxiliary decision making function is achieved for improving rapid power supply capacity.
In order to better implement the above method, an embodiment of the present application provides a structural block diagram of a current transformer abnormality monitoring device, as shown in fig. 2, the device 20 specifically includes:
the acquisition module 201 is used for: collecting circuit data of external loops corresponding to all secondary windings of the current transformer in operation; the circuit data are current values or voltage data to ground.
The first judging module 202 is configured to: when the circuit data are current values, obtaining current values of external loops corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, obtaining current values of external loops corresponding to target secondary windings, and obtaining a running reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except the target secondary winding and an initial reference value, the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding.
The second judging module 203 is configured to: if the circuit data are the data of the voltage to ground, obtaining the data of the voltage to ground of an external loop corresponding to the secondary winding of the current transformer; and judging whether the external circuit corresponding to the secondary winding has abnormal voltage rise according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding have abnormality according to the judging result.
In one possible design, the first determining module 202 is specifically configured to: and if a secondary winding with the difference value between the running multiple and the initial multiple being larger than a difference value threshold exists, judging that the secondary winding and an external loop corresponding to the secondary winding are abnormal.
In one possible design, the first determining module 202 is specifically configured to: and if the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is larger than a difference value threshold, judging that the target secondary winding and an external loop corresponding to the target secondary winding are abnormal.
In one possible design, the first determining module 202 is specifically configured to: and if at least two secondary windings exist and the secondary windings of which the difference value between the running multiple and the initial multiple of the external loop corresponding to the secondary windings is larger than a difference threshold value and the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is not larger than the difference threshold value, judging that the whole current transformer is damaged.
In one possible design, the second determining module 203 is specifically configured to: if the change amount of the data of the external loop corresponding to the secondary winding to the ground voltage is larger than the voltage threshold value within the preset time length, the judgment result is that the voltage of the external loop corresponding to the secondary winding is abnormally increased; if the change amount of the data of the external loop corresponding to the secondary winding to the ground voltage is not larger than the voltage threshold value within the preset time length, the judgment result is that the external loop corresponding to the secondary winding has no abnormal voltage rise.
In one possible design, the second determining module 203 is specifically configured to: if the judgment result shows that the abnormal voltage rise exists in the external circuit corresponding to the secondary winding, determining that the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal; if the judgment result shows that the external loop corresponding to the secondary winding has no abnormal voltage rise, determining that the secondary winding of the current transformer and the external loop corresponding to the secondary winding have no abnormality.
In one possible design, the apparatus 20 further includes a voltage data monitoring module for collecting voltage data to ground of an external circuit corresponding to the secondary winding of the current transformer.
In one possible design, the apparatus 20 further comprises a data storage module, specifically for: when the secondary windings of the current transformer and the external loops corresponding to the secondary windings are abnormal, current waveforms of all the secondary windings of the current transformer and ground voltage waveforms of the external loops of the secondary windings in a target time period are obtained for maintenance personnel to review and check; the target time period is a time period from a preset time before the abnormal time to the abnormal end time.
In one possible design, the apparatus 20 further includes an alarm output module, specifically for: when the secondary winding of the current transformer and the external loop corresponding to the secondary winding are determined to be abnormal, alarm information of the abnormal secondary winding and the external loop corresponding to the abnormal secondary winding is sent to remind operation and maintenance personnel to check and maintain.
Based on the device, monitoring and early warning of current and voltage of the secondary part of the current transformer can be realized, the abnormal operation of the secondary part of the current transformer can be early warned in time, and the operation safety of the current transformer is effectively improved. In addition, the complete record of data during abnormal operation of the secondary part of the current transformer can be realized, operation and maintenance personnel can be effectively assisted to rapidly analyze faults or protection action reasons, and powerful auxiliary decision making function is achieved for improving rapid power supply capacity.
FIG. 3 illustrates an internal block diagram of a computer device in one embodiment. The computer device may specifically be a terminal or a server. As shown in fig. 3, the computer device includes a processor, a memory, and a network interface connected by a system bus. The memory includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program which, when executed by a processor, causes the processor to carry out all the steps of the above-described method. The internal memory may also have stored therein a computer program which, when executed by a processor, causes the processor to perform all the steps of the method described above. It will be appreciated by those skilled in the art that the structure shown in FIG. 3 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is presented comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of the aforementioned method.
In one embodiment, a computer-readable storage medium is provided, storing a computer program which, when executed by a processor, causes the processor to perform the steps of the aforementioned method.
Those skilled in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by a computer program for instructing relevant hardware, where the program may be stored in a non-volatile computer readable storage medium, and where the program, when executed, may include processes in the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method for monitoring anomalies in a current transformer, the method comprising:
collecting circuit data of external loops corresponding to all secondary windings of the current transformer in operation; the circuit data are current value or voltage to ground data;
when the circuit data are current values, obtaining current values of external loops corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, obtaining current values of external loops corresponding to target secondary windings, and obtaining a running reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except for the target secondary winding and an initial reference value, wherein the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding;
if the circuit data are the data of the voltage to ground, obtaining the data of the voltage to ground of an external loop corresponding to the secondary winding of the current transformer; and judging whether the voltage of the external circuit corresponding to the secondary winding is abnormally increased or not according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal or not according to the judging result.
2. The method according to claim 1, wherein determining whether the secondary winding of the current transformer and the external loop corresponding to the secondary winding are abnormal according to the magnitude relation between the operation multiple and the initial multiple comprises:
and if a secondary winding with the difference value of the operation multiple and the initial multiple being larger than a difference value threshold exists, judging that the external loop corresponding to the secondary winding with the difference value of the operation multiple and the initial multiple being larger than the difference value threshold exists abnormal.
3. The method according to claim 1, wherein determining whether there is an abnormality in the secondary winding of the current transformer and an external circuit corresponding to the secondary winding according to the magnitude relation between the operation multiple and the initial multiple, further comprises:
and if the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is larger than a difference value threshold, judging that the target secondary winding and an external loop corresponding to the target secondary winding are abnormal.
4. The method of claim 1, wherein determining whether the secondary winding of the current transformer and the external loop corresponding to the secondary winding are abnormal according to the magnitude relation of the operational multiple and the initial multiple, further comprises:
and if at least two secondary windings exist and the secondary windings of which the difference value between the running multiple and the initial multiple of the external loop corresponding to the secondary windings is larger than a difference threshold value and the difference value between the running multiple and the initial multiple of all secondary windings except the target secondary winding is not larger than the difference threshold value, judging that the whole current transformer is damaged.
5. The method according to claim 1, wherein the step of determining whether an abnormal voltage rise exists in the external circuit corresponding to the secondary winding according to the ground voltage data, to obtain a determination result, includes:
if the change amount of the data of the external loop corresponding to the secondary winding to the ground voltage is larger than the voltage threshold value within the preset time length, the judgment result is that the voltage of the external loop corresponding to the secondary winding is abnormally increased;
if the change amount of the data of the external loop corresponding to the secondary winding to the ground voltage is not larger than the voltage threshold value within the preset time length, the judgment result is that the external loop corresponding to the secondary winding has no abnormal voltage rise.
6. The method of claim 1, wherein determining whether the current transformer secondary winding and the external loop corresponding to the secondary winding are abnormal according to the determination result comprises:
if the judgment result shows that the abnormal voltage rise exists in the external circuit corresponding to the secondary winding, determining that the secondary winding of the current transformer and the external circuit corresponding to the secondary winding are abnormal;
if the judgment result shows that the external loop corresponding to the secondary winding has no abnormal voltage rise, determining that the secondary winding of the current transformer and the external loop corresponding to the secondary winding have no abnormality.
7. The method according to claim 1, wherein the method further comprises:
when the secondary windings of the current transformer and the external loop corresponding to the secondary windings are abnormal, current waveforms and ground voltage waveforms of all the secondary windings of the current transformer in a target time period are acquired for maintenance personnel to review and check; the target time period is a time period from a preset time before the abnormal time to the abnormal end time.
8. The method according to claim 1, wherein the method further comprises:
when the secondary winding of the current transformer and the external loop corresponding to the secondary winding are determined to be abnormal, alarm information of the abnormal secondary winding and the external loop corresponding to the abnormal secondary winding is sent to remind operation and maintenance personnel to check and maintain.
9. A current transformer anomaly monitoring device, the device comprising:
and the acquisition module is used for: the circuit data of the external loops corresponding to all secondary windings of the current transformer in operation are collected; the circuit data are current value or voltage to ground data;
a first judging module: when the circuit data are current values, acquiring the current values of the external circuits corresponding to all secondary windings of the current transformer in operation, obtaining first current values of all secondary windings, and acquiring the current values of the external circuits corresponding to the target secondary windings, thereby obtaining a running time reference value; calculating the multiple of the first current value corresponding to each secondary winding except the target secondary winding and the reference value in operation to obtain the operation multiple corresponding to each secondary winding except the target secondary winding; the target secondary winding is any one selected from all secondary windings in the current transformer, and the target secondary winding is not changed after being selected; determining whether the secondary winding of the current transformer and an external loop corresponding to the secondary winding are abnormal or not according to the magnitude relation between the operation multiple and the initial multiple; the initial multiple is a multiple between a second current value of each secondary winding except for the target secondary winding and an initial reference value, wherein the second current value is a current value acquired from an external loop corresponding to the secondary winding in the current transformer when the current transformer is operated for the first time, and the initial reference value is the second current value of the target secondary winding;
and a second judging module: the method comprises the steps of obtaining the ground voltage data of an external loop corresponding to a secondary winding of a current transformer if circuit data are the ground voltage data; and judging whether the external circuit corresponding to the secondary winding has abnormal voltage rise according to the ground voltage data, obtaining a judging result, and determining whether the secondary winding of the current transformer and the external circuit corresponding to the secondary winding have abnormality according to the judging result.
10. A computer readable storage medium storing a computer program, which when executed by a processor causes the processor to perform the steps of the method according to any one of claims 1 to 8.
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| CN202310819923.9A CN116930848A (en) | 2023-07-05 | 2023-07-05 | Current transformer abnormality monitoring method and related device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117477495A (en) * | 2023-12-28 | 2024-01-30 | 国网山西省电力公司太原供电公司 | Current transformer state monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117477495A (en) * | 2023-12-28 | 2024-01-30 | 国网山西省电力公司太原供电公司 | Current transformer state monitoring system and method |
| CN117477495B (en) * | 2023-12-28 | 2024-03-12 | 国网山西省电力公司太原供电公司 | Current transformer state monitoring system and method |
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