CN116106815A - Method and system for reducing measurement error of current transformer - Google Patents
Method and system for reducing measurement error of current transformer Download PDFInfo
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Abstract
The application relates to the technical field of current detection, and discloses a method and a system for reducing measurement errors of a current transformer, wherein the method for reducing the measurement errors of the current transformer comprises the following steps: acquiring power supply parameters of a cable to be tested, and generating a current monitoring model based on the power supply parameters; acquiring current parameters measured by a current transformer in real time, generating a current change graph, inputting the current change graph into a current monitoring model, and monitoring a current change event; acquiring a correction calibration period, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event; generating a correction calibration instruction based on the correction calibration plan and sending the correction calibration instruction to a correction calibration device; the application has the effect of being convenient for improve the detection precision of current transformer.
Description
Technical Field
The application relates to the technical field of current detection, in particular to a method and a system for reducing measurement errors of a current transformer.
Background
The current transformer is an instrument for converting primary side large current into secondary side small current to measure according to an electromagnetic induction principle, how to improve the measurement accuracy of current and reduce errors is always an important technical problem puzzling the power industry, and a parallel transformer or a method for reducing load impedance is usually adopted at present to reduce the measurement errors, and the method has the problems of complex design, difficult realization, unsatisfactory effect and the like.
As is clear from the above related art, the conventional current detection method has a problem that it is difficult to improve the detection accuracy.
Disclosure of Invention
In order to facilitate improvement of detection accuracy of a current transformer, the application provides a method and a system for reducing measurement errors of the current transformer.
The first technical scheme adopted by the invention of the application is as follows:
a method of reducing measurement errors of a current transformer, comprising:
acquiring power supply parameters of a cable to be tested, and generating a current monitoring model based on the power supply parameters;
acquiring current parameters measured by a current transformer in real time, generating a current change graph, inputting the current change graph into a current monitoring model, and monitoring a current change event;
acquiring a correction calibration period, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event;
and generating a correction calibration instruction based on the correction calibration plan and sending the correction calibration instruction to the correction calibration device.
By adopting the technical scheme, the power supply parameters of the cable to be tested are obtained according to the application of the cable to be tested and the corresponding power transmission task, so that the current parameters of the cable to be tested in normal power transmission can be conveniently judged, a current monitoring model is generated based on the power supply parameters, whether the current parameters of the cable to be tested are normal or not can be conveniently judged subsequently, and the current change trend can be monitored; acquiring current parameters of a cable to be tested in real time through a current transformer, generating a current change graph according to the measured current parameters and corresponding time so as to acquire a current change trend, inputting the current change graph into a current monitoring model, and monitoring a current change event of current mutation through the current change graph; the method comprises the steps of obtaining a correction calibration period so as to determine a period for carrying out periodic calibration on the current transformer, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event, wherein the correction calibration plan is used for generating a correction calibration instruction sent to a correction calibration device, the correction calibration device is used for executing correction calibration work, and is convenient for executing correction calibration work when current is suddenly changed on the basis of periodically executing the correction calibration plan, so that the monitoring precision of the current transformer is improved.
In a preferred example, the present application: the step of obtaining the power supply parameters of the cable to be tested and generating the current monitoring model based on the power supply parameters comprises the following steps:
acquiring a circuit design diagram, and determining model information of each circuit device to acquire rated parameters of each circuit device;
acquiring running state information of each circuit device, and calculating power supply parameters of the cable to be tested based on the running state information and rated parameters;
and setting a corresponding warning threshold value based on the power supply parameter of the cable to be tested, and generating a current monitoring model based on each rated parameter and the warning threshold value.
By adopting the technical scheme, the circuit design diagram is acquired so as to determine the model information of the circuit equipment such as cables, electric equipment and the like in the circuit, and the rated parameters of the circuit equipment are conveniently acquired through the model information; acquiring the running state information of each circuit device so as to calculate the power consumption of each electric equipment and the power transmission parameters of each cable according to the running state information of each circuit device and the corresponding rated parameters, thereby being convenient for calculating the power supply parameters of the cable to be tested; corresponding warning thresholds are set based on power supply parameters of the cable to be tested, and meanwhile, a current monitoring model is generated based on rated parameters and the warning thresholds, so that the change condition of passing current in the cable to be tested can be detected conveniently.
In a preferred example, the present application: the method for monitoring the current change event comprises the steps of:
acquiring current parameters measured by a current transformer in real time, generating a current change chart based on the current parameters and corresponding sampling time, and inputting the current change chart into a current monitoring model;
when the current parameter is larger than a preset warning threshold value, generating a current change signal;
setting an evaluation period and a change rate threshold, calculating the change rate of the current parameter in the evaluation period in real time, and generating a current change signal when the change rate is larger than the change rate threshold.
By adopting the technical scheme, the current parameters of the cable to be tested are detected through the current transformer in real time according to the preset sampling period, a current change diagram is generated according to the current parameters and the corresponding sampling time points, and the current change diagram is input into the current monitoring model so as to monitor the abnormal condition of the current parameters through the current monitoring model; when the current parameter is larger than a preset warning threshold value, the current parameter is considered to be beyond the normal numerical range of the current circuit, and a current change signal is generated; and setting the duration of the evaluation period and a change rate threshold according to actual requirements, calculating the change rate of the current parameter in the evaluation period in real time, and generating a current change signal when the change rate of the current parameter in one evaluation period is greater than the change rate threshold, so that a current change event can be conveniently determined based on the current change signal to take corresponding countermeasures.
In a preferred example, the present application: the step of obtaining the correction calibration period and determining the correction calibration plan based on the correction calibration period and the time node of the current change event comprises the following steps:
acquiring a correction calibration period set by the current transformer, and generating a correction calibration plan based on the correction calibration period;
when the current change time corresponding to the current change event is obtained, the current change time is added to the correction calibration plan so as to update the correction calibration plan.
By adopting the technical scheme, a correction calibration period is set for the current transformer according to the current parameter detection precision requirement of the current transformer corresponding to the cable to be tested, and a correction calibration plan is generated according to the set correction calibration period, so that the current transformer is corrected and calibrated regularly according to the preset correction calibration period; when the current change time corresponding to the current change event is obtained, updating the correction calibration plan based on the current change time, and adding the current change time into the correction calibration plan to update the correction calibration plan, so that the correction calibration work is conveniently executed when the current change event occurs on the basis of regularly correcting calibration work of the current transformer.
In a preferred example, the present application: after the step of generating a correction calibration command based on the correction calibration plan and transmitting the correction calibration command to the correction calibration device, the method comprises the following steps:
when a correction calibration instruction is detected, determining a test parameter based on the current parameter, modulating a test current based on the test parameter, and inputting the test current into a current transformer, wherein the test parameter is in direct proportion to the current parameter;
and acquiring a calibration current parameter measured by the current transformer, calculating the current correction rate based on the calibration current parameter and the test parameter, and correcting the current parameter based on the correction rate.
By adopting the technical scheme, when the correction calibration instruction is detected, the correction calibration work is started, the corresponding test parameter is determined based on the current parameter, the test current is modulated according to the test parameter, the test current is input into the current transformer, the conversion multiplying power of the current transformer is conveniently judged according to the influence of the test current on the output current of the current transformer, and the test parameter is in direct proportion to the current parameter so as to adapt the test current to the current conveyed in the cable to be tested; after the test current is input to the current transformer, obtaining data measured by the current transformer, subtracting the original current parameter to obtain a calibrated current parameter, calculating the actual conversion multiplying power of the current transformer to be a correction multiplying power according to the calibrated current parameter and the test parameter, and correcting the current parameter based on the correction multiplying power, thereby achieving the effect of improving the detection accuracy of the current parameter.
In a preferred example, the present application: the step of obtaining the current parameters measured by the current transformer in real time comprises the following steps:
acquiring current data measured by a current transformer in real time, and analyzing the peak value and the change frequency of the current data;
and calculating the effective value of the current data in each sampling period as a corresponding current parameter.
Through adopting above-mentioned technical scheme, because current transformer can be used to detect the electric current of direct current and alternating current, when the detected be the alternating current, the current value changes constantly, can lead to the fact the interference to the discernment of current change event, consequently, carries out the analysis to the current data that current transformer measured to handle the alternating current, thereby reduce the alternating current and change the interference that the discernment current change event caused among this application technical scheme.
In a preferred example, the present application: and determining a test parameter based on the current parameter, modulating a test current based on the test parameter, and inputting the test current into the current transformer, wherein the number of current values in the test parameter is a plurality.
By adopting the technical scheme, the number of the current values in the test parameters is multiple, so that when correction calibration work is executed, the test currents with different magnitudes are modulated to test the current transformer, and the accuracy of correction multiplying power calculation is further improved.
The second object of the present application is achieved by the following technical scheme:
the system for reducing the measurement error of the current transformer comprises the current transformer, a current detector and a correction calibration device, wherein the current transformer is used for being connected with a cable to be tested, the current transformer is electrically connected with the current detector, the correction calibration device comprises a correction winding and a control unit electrically connected with the correction winding, the correction winding is connected with the current transformer, the control unit is used for executing any step of the method for reducing the measurement error of the current transformer, and the current detector is electrically connected with the control unit.
By adopting the technical scheme, the system for reducing the measurement error of the current transformer comprises the current transformer, the current detector and the correction calibration device, wherein the current transformer is used for connecting a cable to be tested, performing multiplying power conversion on the passing current in the cable to be tested, and testing current parameters by the current detector; the correction calibration device is used for carrying out correction calibration operation on the current transformer, wherein the correction calibration device comprises a control unit and a correction winding, the control unit is used for executing any method for reducing the measurement error of the current transformer, the correction calibration device is used for modulating test current and inputting the test current to the current transformer through the correction winding, and the current detector is electrically connected to the control unit and used for sending detected current parameters to the correction calibration device and simultaneously facilitating correction of the output result of the current parameters according to the acquired correction multiplying power.
In a preferred example, the present application: the current transformer comprises a magnetic conduction ring and a detection winding, the detection winding is wound on the magnetic conduction ring, the correction winding is wound on the magnetic conduction ring, two ends of a detection winding wire are connected with a current detector, and the current detector is in radio connection with a control unit.
By adopting the technical scheme, the current transformer comprises a magnetic conduction ring and a detection winding, wherein the detection winding and the correction winding are both wound on the magnetic conduction ring, and two ends of a detection winding wire are connected with a current detector and are used for detecting current and test current in a cable to be tested; the current detector is wirelessly connected with the control unit, so that detected current parameters or calibration current parameters can be conveniently transmitted to the control unit in a wireless mode, the influence of control unit equipment on the volume of the current transformer equipment is reduced, and meanwhile one control unit can be used for controlling a plurality of current transformers at the same time.
In a preferred example, the present application: the control unit is provided with an adjustable power supply, and the correction winding is electrically connected to the adjustable power supply.
By adopting the technical scheme, the control unit is provided with the adjustable power supply and is used for modulating the test current, and the correction winding is electrically connected with the adjustable power supply, so that the test current can be conveniently input into the current transformer through the correction winding.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the application of the cable to be tested and the corresponding power transmission task, the power supply parameters of the cable to be tested are obtained, so that the current parameters of the cable to be tested during normal power transmission can be conveniently judged, a current monitoring model is generated based on the power supply parameters, whether the current parameters of the cable to be tested are normal or not can be conveniently judged subsequently, and the current change trend can be monitored; acquiring current parameters of a cable to be tested in real time through a current transformer, generating a current change graph according to the measured current parameters and corresponding time so as to acquire a current change trend, inputting the current change graph into a current monitoring model, and monitoring a current change event of current mutation through the current change graph; the method comprises the steps of obtaining a correction calibration period so as to determine a period for carrying out periodic calibration on the current transformer, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event, wherein the correction calibration plan is used for generating a correction calibration instruction sent to a correction calibration device, the correction calibration device is used for executing correction calibration work, and is convenient for executing correction calibration work when current is suddenly changed on the basis of periodically executing the correction calibration plan, so that the monitoring precision of the current transformer is improved.
2. Acquiring a circuit design diagram so as to determine model information of circuit equipment such as cables, electric equipment and the like in a circuit and conveniently acquire rated parameters of the circuit equipment through the model information; acquiring the running state information of each circuit device so as to calculate the power consumption of each electric equipment and the power transmission parameters of each cable according to the running state information of each circuit device and the corresponding rated parameters, thereby being convenient for calculating the power supply parameters of the cable to be tested; corresponding warning thresholds are set based on power supply parameters of the cable to be tested, and meanwhile, a current monitoring model is generated based on rated parameters and the warning thresholds, so that the change condition of passing current in the cable to be tested can be detected conveniently.
3. Detecting current parameters of a cable to be tested through a current transformer in real time according to a preset sampling period, generating a current change diagram according to the current parameters and corresponding sampling time points, and inputting the current change diagram into a current monitoring model so as to monitor abnormal conditions of the current parameters through the current monitoring model; when the current parameter is larger than a preset warning threshold value, the current parameter is considered to be beyond the normal numerical range of the current circuit, and a current change signal is generated; and setting the duration of the evaluation period and a change rate threshold according to actual requirements, calculating the change rate of the current parameter in the evaluation period in real time, and generating a current change signal when the change rate of the current parameter in one evaluation period is greater than the change rate threshold, so that a current change event can be conveniently determined based on the current change signal to take corresponding countermeasures.
Drawings
Fig. 1 is a flowchart of a method for reducing measurement error of a current transformer according to a first embodiment of the present application.
Fig. 2 is a flowchart of step S10 in a method for reducing measurement error of a current transformer according to the present application.
Fig. 3 is a flowchart of step S20 in a method for reducing measurement error of a current transformer according to the present application.
Fig. 4 is a flowchart of step S30 in a method for reducing measurement error of a current transformer according to the present application.
Fig. 5 is a flowchart of step S40 in a method for reducing measurement error of a current transformer according to the present application.
Fig. 6 is a schematic device structure diagram of a system for reducing measurement errors of a current transformer in a second embodiment of the present application.
Fig. 7 is a schematic view of an apparatus in a third embodiment of the present application.
Reference numerals illustrate:
100. a cable to be tested; 1. a current transformer; 11. a magnetic conductive ring; 12. detecting a winding; 2. a current detector; 3. correcting the calibration device; 31. correcting the winding; 32. and a control unit.
Detailed Description
The present application is described in further detail below in conjunction with figures 1 to 7.
Example 1
The application discloses a method for reducing measurement errors of a current transformer, which can be used for detecting the existing current transformer, so that the effects of improving the detection precision of the current transformer and reducing the detection errors are achieved.
In this embodiment, the cable to be measured refers to a power transmission cable that needs to perform current parameter measurement; the current parameter means a parameter of a current value.
As shown in fig. 1, the method for reducing the measurement error of the current transformer specifically includes the following steps:
s10: and acquiring power supply parameters of the cable to be tested, and generating a current monitoring model based on the power supply parameters.
In this embodiment, the power supply parameter refers to a related parameter of the internal passing current of the cable to be tested; the current monitoring model is used for judging whether the current parameters of the cable to be tested are normal or not and monitoring the current change trend in the cable to be tested.
Referring to fig. 2, in step S10, the specific steps of obtaining a power supply parameter of a cable to be tested and generating a current monitoring model based on the power supply parameter include:
s11: and acquiring a circuit design diagram, and determining model information of each circuit device to acquire rated parameters of each circuit device.
In this embodiment, the circuit design diagram refers to a design diagram of a circuit system where a cable to be tested is located, and the circuit equipment refers to various devices in the circuit system where the cable to be tested is located, including electric equipment, cables, and the like.
Specifically, a circuit design diagram of a circuit system where a cable to be tested is located is obtained, model information corresponding to each circuit device is determined from the circuit design diagram, and rated parameters of each circuit device are obtained from related technical manuals based on the model information of each circuit device; technical manuals include national standard documents, industry standard documents, enterprise standard documents, specifications, and the like.
S12: and acquiring the running state information of each circuit device, and calculating the power supply parameters of the cable to be tested based on the running state information and the rated parameters.
In this embodiment, the operation state information refers to information for recording the operation state of the circuit device, including information about whether to start, start a gear, current operating power, and the like.
Specifically, the running state information of each circuit device is obtained through the existing intelligent circuit switch or the intelligent control module of the circuit device, so that the power supply parameters in the cable to be tested are calculated according to the current running state information of each circuit device and the corresponding rated parameters.
S13: and setting a corresponding warning threshold value based on the power supply parameter of the cable to be tested, and generating a current monitoring model based on each rated parameter and the warning threshold value.
In this embodiment, the warning threshold is a threshold for determining whether the current in the cable to be tested exceeds the normal fluctuation range.
Specifically, since the power supply parameter is an ideal value of the cable current to be measured calculated according to the current working state of each circuit device, in actual situations, the actual resistance and the power consumption value of each circuit device may deviate from the ideal state, therefore, a corresponding warning threshold value is set according to the power supply parameter, when the current in the cable to be measured reaches the warning threshold value, the current parameter of the cable to be measured is considered to be abnormal, and the abnormality of the current parameter may be caused by measurement errors or circuit faults; in this embodiment, the warning threshold may be determined according to the value of the power supply parameter, for example, the warning threshold may be determined to be equal to or greater than 110% of the power supply parameter and equal to or less than 90% of the power supply parameter.
Specifically, based on rated parameters of each circuit device in a circuit system where the cable to be tested is located and an alarm threshold value of the cable to be tested, a current monitoring model is generated, so that conditions such as abnormal passing current in the cable to be tested can be detected conveniently.
S20: and acquiring current parameters measured by the current transformer in real time, generating a current change graph, inputting the current change graph into a current monitoring model, and monitoring a current change event.
In this embodiment, the current parameter refers to current value data measured from the cable to be measured; the current change graph refers to a graph of current generated based on current parameters and corresponding sampling times over time; the current change event refers to an event of abrupt current value change in the cable to be tested.
Specifically, current parameters of the cable to be tested are obtained in real time through the current transformer, a current change chart is generated based on the current parameters and corresponding sampling time and is input into a current monitoring model, so that current change events are monitored.
In the specific step of monitoring the current change event, referring to fig. 3, in step S20, the method includes:
s21: and acquiring current parameters measured by the current transformer in real time, generating a current change chart based on the current parameters and corresponding sampling time, and inputting the current change chart into a current monitoring model.
Specifically, current parameters of a cable to be tested are detected in real time according to a preset sampling period through a current transformer, each collected current parameter and a corresponding sampling time node are used for generating a current change diagram, and the current change diagram is input into a current monitoring model so as to monitor the abnormal condition of the current parameters through the current monitoring model.
Because the current transformer can be used for detecting the current of direct current and alternating current, when the detected current is alternating current, the current value changes at any time, and the recognition of a current change event is interfered, the specific steps for acquiring the current parameters measured by the current transformer in real time comprise:
s211: and acquiring current data measured by the current transformer in real time, and analyzing the peak value and the change frequency of the current data.
In this embodiment, the current data refers to current value raw data directly measured by the detection end of the current transformer.
Specifically, the current data in the cable to be tested is detected through the detection end of the current transformer, the current data is analyzed, the current peak value and the current direction change frequency of the electric energy conveyed in the cable to be tested are determined, and the type and the current change trend of the current conveyed in the cable to be tested are conveniently judged.
S212: and calculating the effective value of the current data in each sampling period as a corresponding current parameter.
Specifically, a sampling period is set according to analysis requirements on the current data, preferably, the sampling period can be set to 0.2 seconds, an effective value of the current data in the sampling period is calculated according to a current peak value and a current direction change frequency of the current data in the sampling period, and the calculated effective value of the current data is set as a current parameter in the sampling period, so that the effective current change condition of the alternating current is conveniently analyzed subsequently.
S22: and when the current parameter is larger than a preset warning threshold value, generating a current change signal.
Specifically, when the current parameter is greater than the preset warning threshold, the current parameter is considered to be beyond the normal numerical range of the current circuit, namely a current change event occurs, and a current change signal is generated to mark the current change event, so that corresponding countermeasures can be conveniently taken subsequently.
S23: setting an evaluation period and a change rate threshold, calculating the change rate of the current parameter in the evaluation period in real time, and generating a current change signal when the change rate is larger than the change rate threshold.
In the present embodiment, the evaluation period refers to a period for evaluating the condition of the change in the current parameter; the change rate refers to the ratio of the difference value between the maximum value and the minimum value of the current parameter to the minimum value of the current parameter by taking the minimum value of the current parameter as a reference in the evaluation period; the change rate threshold value refers to a threshold value for evaluating whether or not the change rate of the current parameter meets the current change event condition; the current change signal refers to a signal for marking a current change event.
Specifically, the evaluation period is set according to the actual detection demand, wherein the evaluation period is a plurality of sampling periods, the change rate threshold is set according to the actual detection demand, preferably, the evaluation period can be set to 10 sampling periods, each sampling period is 0.1S, and the change rate threshold can be set to 3%.
Specifically, the change rate of the current parameter in the evaluation period is calculated in real time, when the change rate of the current parameter in one evaluation period is larger than the change rate threshold, the current change rate is considered to be larger, a current change event occurs, a current change signal is generated, and the current change event is conveniently determined based on the current change signal so as to take corresponding countermeasures.
S30: and acquiring a correction calibration period, and determining a correction calibration plan based on the correction calibration period and a time node of the current change event.
In this embodiment, the correction calibration period is a period in which the pointer performs periodic correction calibration on the current transformer; the correction calibration plan refers to a plan for performing correction calibration work.
The specific steps for determining the correction calibration plan may refer to fig. 4, and in step S30, the method includes:
s31: and acquiring a correction calibration period set by the current transformer, and generating a correction calibration plan based on the correction calibration period.
Specifically, according to the current parameter detection precision requirement of the current transformer corresponding to the cable to be tested, a correction calibration period is set for the current transformer, preferably, the correction calibration period can be set to be 1 hour, and a correction calibration plan is generated according to the set correction calibration period, so that the current transformer is corrected and calibrated regularly according to a preset correction calibration period.
S32: when the current change time corresponding to the current change event is obtained, the current change time is added to the correction calibration plan so as to update the correction calibration plan.
In this embodiment, the current change time refers to a time node corresponding to a current change event; the correction calibration plan refers to information for controlling the execution plan of the correction calibration work.
Specifically, when the current change time corresponding to the current change event is obtained, updating the correction calibration plan based on the current change time, adding the current change time to the correction calibration plan, adjusting a subsequent correction calibration time node in the correction calibration plan, enabling the interval of one correction calibration time interval after the current change time and the current change time to be a correction calibration period, updating the correction calibration plan, and facilitating the correction calibration work to be executed when the current change event occurs on the basis of the correction calibration work of the current transformer regularly.
S40: and generating a correction calibration instruction based on the correction calibration plan and sending the correction calibration instruction to the correction calibration device.
In the present embodiment, the correction calibration instruction refers to an instruction for controlling the start of execution of the correction calibration operation.
Specifically, after the correction calibration plan is generated, a correction calibration instruction is generated based on the calibration plan and sent to the correction calibration device so as to control the correction calibration device to execute correction calibration work.
Referring to fig. 5, after step S40, the method for reducing the measurement error of the current transformer further includes:
s41: when the correction calibration instruction is detected, a test parameter is determined based on the current parameter, the test current is modulated based on the test parameter, and the test parameter is input into the current transformer, and the test parameter is in direct proportion to the current parameter.
In this embodiment, the test current refers to the current input to the current transformer by the correction calibration device when the correction calibration is performed; the test parameters refer to parameters for modulating the test current.
Specifically, when a correction calibration instruction is detected, starting to execute correction calibration work, and determining corresponding test parameters based on the current parameters, wherein the test parameters are in direct proportion to the current parameters, and preferably, the test parameters and the current parameters are 1:10 so as to enable the test current to be suitable for the current conveyed in the cable to be tested; and modulating the test current according to the test parameters, inputting the test current into the current transformer, and judging the conversion multiplying power of the current transformer according to the influence of the test current on the output current of the current transformer.
Specifically, the test parameters are determined based on the current parameters, the test currents are modulated based on the test parameters, and the number of the current values in the test parameters is multiple in the step of inputting the test currents into the current transformer, so that the current transformer is conveniently tested by modulating the test currents with different magnitudes when correction calibration work is carried out, and the accuracy of correction multiplying power calculation is further improved.
S42: and acquiring a calibration current parameter measured by the current transformer, calculating the current correction rate based on the calibration current parameter and the test parameter, and correcting the current parameter based on the correction rate.
In this embodiment, the calibration current parameter refers to a parameter of the measured current after the current transformer performs rate conversion on the test current.
Specifically, after the test current is input to the current transformer, the current transformer is simultaneously input with the current in the cable to be tested and the test current, data measured by the current transformer are obtained, the original current parameter is subtracted to obtain a calibrated current parameter, the actual conversion multiplying power of the current transformer is calculated to be the correction multiplying power according to the calibrated current parameter and the test parameter, the correction multiplying power=the calibrated current parameter/the test parameter, and the current parameter is corrected based on the correction multiplying power, so that the effect of improving the detection accuracy of the current parameter is achieved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
The current transformer can be used for measuring voltage, and only the acquired current parameter is changed into the voltage parameter, and other parameters related to the voltage are acquired according to the technical scheme in the application.
Example two
As shown in fig. 6, the application discloses a system for reducing measurement errors of a current transformer, which comprises the current transformer, a current detector and a correction calibration device, wherein the current transformer is used for being connected with a cable to be tested and performing rate conversion on current of the cable to be tested, and the current transformer is electrically connected with the current detector so as to detect current parameters after rate conversion through the current detector, and the correction calibration device is used for correcting and calibrating the current transformer.
The current transformer comprises a magnetic ring and detection windings, the detection windings are wound on the magnetic ring, and two ends of a detection winding wire are connected with the current detector so that the current detector can measure the current in the detection windings.
The correction calibration device comprises a correction winding and a control unit electrically connected with the correction winding, wherein the control unit is used for executing any step of the method for reducing the measurement error of the current transformer, the control unit is provided with an adjustable power supply, the correction winding is electrically connected with the adjustable power supply, the correction winding is wound on the magnetic ring, so that the adjustable power supply modulates test current according to test parameters, and the test current is input to the current transformer through the correction winding.
The current detector and the control unit are both provided with wireless communication modules, the current detector is in wireless connection with the control unit, so that the current detector can conveniently send detected current parameters to the control unit, and meanwhile, the control unit can conveniently send acquired correction multiplying power to the current detector so as to correct the output result of the current parameters; the influence of the control unit device on the volume of the current transformer device can be reduced, so that one control unit can be used for controlling a plurality of current transformers at the same time.
Example III
A computer device, which may be a server, may have an internal structure as shown in fig. 7. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing data such as power supply parameters, a current monitoring model, current parameters, a current change chart, a correction calibration period, a current change signal, a correction calibration plan, a correction calibration instruction and the like. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of reducing a measurement error of a current transformer.
In one embodiment, a computer device is provided comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
s10: acquiring power supply parameters of a cable to be tested, and generating a current monitoring model based on the power supply parameters;
s20: acquiring current parameters measured by a current transformer in real time, generating a current change graph, inputting the current change graph into a current monitoring model, and monitoring a current change event;
s30: acquiring a correction calibration period, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event;
s40: and generating a correction calibration instruction based on the correction calibration plan and sending the correction calibration instruction to the correction calibration device.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
s10: acquiring power supply parameters of a cable to be tested, and generating a current monitoring model based on the power supply parameters;
s20: acquiring current parameters measured by a current transformer in real time, generating a current change graph, inputting the current change graph into a current monitoring model, and monitoring a current change event;
s30: acquiring a correction calibration period, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event;
s40: and generating a correction calibration instruction based on the correction calibration plan and sending the correction calibration instruction to the correction calibration device.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various 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 (Synchlink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand; the technical scheme described in the foregoing embodiments can be modified or some of the features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method for reducing measurement errors of a current transformer, comprising:
acquiring power supply parameters of a cable to be tested, and generating a current monitoring model based on the power supply parameters;
acquiring current parameters measured by a current transformer in real time, generating a current change graph, inputting the current change graph into a current monitoring model, and monitoring a current change event;
acquiring a correction calibration period, and determining a correction calibration plan based on the correction calibration period and a time node of a current change event;
and generating a correction calibration instruction based on the correction calibration plan and sending the correction calibration instruction to the correction calibration device.
2. A method of reducing measurement errors in a current transformer as set forth in claim 1, wherein: the step of obtaining the power supply parameters of the cable to be tested and generating the current monitoring model based on the power supply parameters comprises the following steps:
acquiring a circuit design diagram, and determining model information of each circuit device to acquire rated parameters of each circuit device;
acquiring running state information of each circuit device, and calculating power supply parameters of the cable to be tested based on the running state information and rated parameters;
and setting a corresponding warning threshold value based on the power supply parameter of the cable to be tested, and generating a current monitoring model based on each rated parameter and the warning threshold value.
3. A method of reducing measurement errors in a current transformer as set forth in claim 1, wherein: the method for monitoring the current change event comprises the steps of:
acquiring current parameters measured by a current transformer in real time, generating a current change chart based on the current parameters and corresponding sampling time, and inputting the current change chart into a current monitoring model;
when the current parameter is larger than a preset warning threshold value, generating a current change signal;
setting an evaluation period and a change rate threshold, calculating the change rate of the current parameter in the evaluation period in real time, and generating a current change signal when the change rate is larger than the change rate threshold.
4. A method of reducing measurement errors in a current transformer as set forth in claim 1, wherein: the step of obtaining the correction calibration period and determining the correction calibration plan based on the correction calibration period and the time node of the current change event comprises the following steps:
acquiring a correction calibration period set by the current transformer, and generating a correction calibration plan based on the correction calibration period;
when the current change time corresponding to the current change event is obtained, the current change time is added to the correction calibration plan so as to update the correction calibration plan.
5. A method of reducing measurement errors in a current transformer as set forth in claim 1, wherein: after the step of generating a correction calibration command based on the correction calibration plan and transmitting the correction calibration command to the correction calibration device, the method comprises the following steps:
when a correction calibration instruction is detected, determining a test parameter based on the current parameter, modulating a test current based on the test parameter, and inputting the test current into a current transformer, wherein the test parameter is in direct proportion to the current parameter;
and acquiring a calibration current parameter measured by the current transformer, calculating the current correction rate based on the calibration current parameter and the test parameter, and correcting the current parameter based on the correction rate.
6. A method of reducing measurement errors in a current transformer according to claim 3, wherein: the step of obtaining the current parameters measured by the current transformer in real time comprises the following steps:
acquiring current data measured by a current transformer in real time, and analyzing the peak value and the change frequency of the current data;
and calculating the effective value of the current data in each sampling period as a corresponding current parameter.
7. The method for reducing measurement errors of a current transformer according to claim 5, wherein: and determining a test parameter based on the current parameter, modulating a test current based on the test parameter, and inputting the test current into the current transformer, wherein the number of current values in the test parameter is a plurality.
8. A system for reducing measurement errors of a current transformer, comprising a current transformer for connecting a cable to be tested, a current detector and a correction calibration device, the current transformer being electrically connected to the current detector, the correction calibration device comprising a correction winding and a control unit electrically connected to the correction winding, the correction winding being connected to the current transformer, the control unit being adapted to perform the steps of the method for reducing measurement errors of a current transformer according to any one of claims 1-7, the current detector being electrically connected to the control unit.
9. A system for reducing measurement errors in a current transformer as set forth in claim 8, wherein: the current transformer comprises a magnetic conduction ring and a detection winding, the detection winding is wound on the magnetic conduction ring, the correction winding is wound on the magnetic conduction ring, two ends of a detection winding wire are connected with a current detector, and the current detector is in radio connection with a control unit.
10. A system for reducing measurement errors in a current transformer as set forth in claim 8, wherein: the control unit is provided with an adjustable power supply, and the correction winding is electrically connected to the adjustable power supply.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013053855A (en) * | 2011-08-31 | 2013-03-21 | National Institute Of Advanced Industrial & Technology | Error estimation device for electronic current transformer |
| WO2018232937A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市盛路物联通讯技术有限公司 | Electric power cable fault monitoring method and apparatus |
| CN113376561A (en) * | 2021-04-28 | 2021-09-10 | 国网重庆市电力公司营销服务中心 | Electric energy metering device remote calibration system based on peer comparison mode |
| CN114325548A (en) * | 2022-01-11 | 2022-04-12 | 云南电网有限责任公司电力科学研究院 | Transmission delay calibration method and system for direct-current electronic current transformer |
| CN115112948A (en) * | 2022-07-29 | 2022-09-27 | 苏州维众数据技术有限公司 | Multi-branch electric quantity calibration method and device, intelligent terminal and storage medium |
| CN115113130A (en) * | 2022-08-26 | 2022-09-27 | 中国电力科学研究院有限公司 | Current transformer state monitoring method and system based on high-frequency vector impedance inversion |
| CN115407255A (en) * | 2022-11-03 | 2022-11-29 | 云南电网有限责任公司 | Current transformer error online monitoring device and method |
| CN115453440A (en) * | 2022-09-26 | 2022-12-09 | 浙江华采科技有限公司 | Digital calibration intelligent management method and system for current transformer |
| CN115480204A (en) * | 2022-09-29 | 2022-12-16 | 武汉格蓝若智能技术有限公司 | Current transformer operation error online evaluation optimization method based on big data deduction |
-
2023
- 2023-02-06 CN CN202310088751.2A patent/CN116106815B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013053855A (en) * | 2011-08-31 | 2013-03-21 | National Institute Of Advanced Industrial & Technology | Error estimation device for electronic current transformer |
| WO2018232937A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市盛路物联通讯技术有限公司 | Electric power cable fault monitoring method and apparatus |
| CN113376561A (en) * | 2021-04-28 | 2021-09-10 | 国网重庆市电力公司营销服务中心 | Electric energy metering device remote calibration system based on peer comparison mode |
| CN114325548A (en) * | 2022-01-11 | 2022-04-12 | 云南电网有限责任公司电力科学研究院 | Transmission delay calibration method and system for direct-current electronic current transformer |
| CN115112948A (en) * | 2022-07-29 | 2022-09-27 | 苏州维众数据技术有限公司 | Multi-branch electric quantity calibration method and device, intelligent terminal and storage medium |
| CN115113130A (en) * | 2022-08-26 | 2022-09-27 | 中国电力科学研究院有限公司 | Current transformer state monitoring method and system based on high-frequency vector impedance inversion |
| CN115453440A (en) * | 2022-09-26 | 2022-12-09 | 浙江华采科技有限公司 | Digital calibration intelligent management method and system for current transformer |
| CN115480204A (en) * | 2022-09-29 | 2022-12-16 | 武汉格蓝若智能技术有限公司 | Current transformer operation error online evaluation optimization method based on big data deduction |
| CN115407255A (en) * | 2022-11-03 | 2022-11-29 | 云南电网有限责任公司 | Current transformer error online monitoring device and method |
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