CN111693924B - System and method for detecting monitoring performance of voltage transformer on-line monitoring device - Google Patents

Abstract

The invention discloses a system and method for detecting the monitoring performance of an on-line monitoring device for measuring performance of voltage transformers. After that, the error adjustment unit is used to adjust the error of one or more voltage transformers under test, and the adjusted error is pushed to the test unit, and the test unit is established to determine which voltage transformer under test is abnormal, and The on-line monitoring device does not know the abnormal amount, and by comparing the results calculated by itself with the results of the test unit, it can detect whether the on-line monitoring device can accurately judge the error change and the size of the detected transformer, and realize the on-line monitoring device. Compared with the existing detection methods, it is closer to the actual operating conditions of the online monitoring device, more in line with the principle of judging the measurement performance, and has a broad space for promotion.

Description

System and method for detecting monitoring performance of voltage transformer on-line monitoring device

technical field

The invention relates to the technical field of power grid operation and maintenance, and more particularly, to a system and method for detecting the monitoring performance of an on-line monitoring device for measuring performance of a voltage transformer.

Background technique

The past ten years have been a period of explosive growth of my country's economy, and the demand for power supply has increased year by year, and power construction will still be in a high-speed growth trend in the future. The large-scale construction of the power grid has increased the power transaction volume year by year, and the accuracy of the power metering device is directly related to the fairness and justice of the power trade, which has become a problem of concern to everyone. The electric energy metering device consists of an electric energy meter, a transformer and a secondary circuit. According to a large number of literature research and field tests, it is found that the error stability of the electric energy meter and the secondary voltage drop is relatively high, and the error stability of the electromagnetic transformer in the transformer is relatively high. The capacitor unit is designed with an open structure, which makes its error susceptible to changes during operation, which is a risk point for the overall error accuracy and stability of the power metering device. Since 2014, several provincial power companies in my country have begun to pilot the online monitoring of the measurement performance of voltage transformers. In 2017, the State Grid Corporation of China published the enterprise standard Q/GDW 11683-2017 "Technical Specifications for Online Detection of Error Characteristics of Capacitive Voltage Transformers". It specifies the methods and judgment standards for on-line monitoring of the measurement performance of voltage transformers. As the technology is more and more widely used, the monitoring results of monitoring devices are the focus of everyone's attention.

Therefore, how to determine the monitoring performance of the voltage transformer measurement performance online monitoring device is an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present invention provides a system and method for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer, so as to solve the problem of how to detect the monitoring performance of an on-line monitoring device for the metering performance of a voltage transformer.

In order to solve the above problems, according to one aspect of the present invention, a system for detecting the monitoring performance of an on-line monitoring device for measuring performance of a voltage transformer is provided, the system comprising:

The industrial frequency program-controlled power supply is respectively connected with the standard voltage transformer unit and the tested voltage transformer unit, and is used to provide a voltage power source for the standard voltage transformer unit and the tested voltage transformer unit;

The standard voltage transformer unit is connected with the online monitoring device and the test unit respectively, and is used for outputting the first voltage signal to the online detection device and the test unit in real time;

The detected voltage transformer unit is connected with the online monitoring device and the testing unit respectively, and is used for outputting the second voltage signal to the online monitoring device and the testing unit in real time;

The secondary load unit is respectively connected with the standard voltage transformer unit and the detected voltage transformer unit, and is used for simulating the actual secondary load, and applying the secondary load on the standard voltage transformer unit and the detected voltage transformer unit. On the output terminal of the secondary winding of the detected voltage transformer unit;

An error adjustment unit, connected to the detected voltage transformer unit and the test unit respectively, for adjusting the error of the detected voltage transformer unit, and sending the error adjustment value to the test unit;

an on-line monitoring device, connected to the test unit, for determining the first error value of the voltage transformer unit under test according to the first voltage signal and the second voltage signal;

a testing unit, configured to determine the second error value of the voltage transformer unit under test according to the first voltage signal, the second voltage signal and the error adjustment value, and determine the online value according to the first error value and the second error value The error value of the monitoring device is monitored, and the monitoring performance of the online monitoring device is determined according to the error value of the online monitoring device.

Preferably, the range of the adjustment ratio difference of the error adjustment unit is [-0.500%, +0.500%], the step is 0.002%; the range of the adjustment phase difference is [-10.00', +10.00'], the step is is 0.02'.

Preferably, the error value includes: a ratio difference value and a phase difference value.

Preferably, the standard voltage transformer unit includes: a set of standard voltage transformers for measuring the voltages of A-phase, B-phase and C-phase respectively; the detected voltage transformer unit includes: at least one group of respectively The voltage transformers under test for measuring the voltages of A-phase, B-phase and C-phase; among them, three are in a group.

Preferably, the determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

If the error-adjusted detected voltage transformer can be determined according to the error value of the online monitoring device, the ratio difference of the online monitoring device is within the first preset range, and the phase difference value is within the second preset range within, it is determined that the functionality and accuracy of the online monitoring device meet the requirements;

If the detected voltage transformer that has undergone error adjustment can be determined according to the error value of the online monitoring device, but the ratio difference value of the online monitoring device is not within the first preset range, or the phase difference value is not within the second preset range, Then it is determined that the functionality of the online monitoring device meets the requirements, but the accuracy does not meet the requirements;

If the detected voltage transformer that has undergone error adjustment cannot be determined according to the error value of the on-line monitoring device, it is determined that the functionality and accuracy of the on-line monitoring device do not meet the requirements.

According to another aspect of the present invention, there is provided a method for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer, the method comprising:

The industrial frequency program-controlled power supply provides voltage power source for the standard voltage transformer unit and the tested voltage transformer unit;

The standard voltage transformer unit outputs the first voltage signal to the online detection device and the test unit in real time, and the detected voltage transformer unit outputs the second voltage signal to the online monitoring device and the test unit in real time;

The error adjustment unit adjusts the error of the detected voltage transformer unit, and sends the error adjustment value to the test unit;

The online monitoring device determines the first error value of the detected voltage transformer unit according to the first voltage signal and the second voltage signal;

The test unit determines the second error value of the detected voltage transformer unit according to the first voltage signal, the second voltage signal and the error adjustment value, and determines the online monitoring device according to the first error value and the second error value. The error value is determined, and the monitoring performance of the online monitoring device is determined according to the error value of the online monitoring device.

Preferably, the range of the adjustment ratio difference of the error adjustment unit is [-0.500%, +0.500%], the step is 0.002%; the range of the adjustment phase difference is [-10.00', +10.00'], the step is is 0.02'.

Preferably, the error value includes: a ratio difference value and a phase difference value.

Preferably, the standard voltage transformer unit includes: a set of standard voltage transformers for measuring the voltages of A-phase, B-phase and C-phase respectively; the detected voltage transformer unit includes: at least one group of respectively The voltage transformers under test for measuring the voltages of A-phase, B-phase and C-phase; among them, three are in a group.

Preferably, the determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

The determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

If the error-adjusted detected voltage transformer can be determined according to the error value of the online monitoring device, the ratio difference of the online monitoring device is within the first preset range, and the phase difference value is within the second preset range within, it is determined that the functionality and accuracy of the online monitoring device meet the requirements;

If the detected voltage transformer that has undergone error adjustment can be determined according to the error value of the online monitoring device, but the ratio difference value of the online monitoring device is not within the first preset range, or the phase difference value is not within the second preset range, Then it is determined that the functionality of the online monitoring device meets the requirements, but the accuracy does not meet the requirements;

If the detected voltage transformer that has undergone error adjustment cannot be determined according to the error value of the on-line monitoring device, it is determined that the functionality and accuracy of the on-line monitoring device do not meet the requirements.

The invention provides a system and method for detecting the monitoring performance of an on-line monitoring device for measuring performance of voltage transformers. After that, the error adjustment unit is used to adjust the error of one or more voltage transformers under test, and the adjusted error is pushed to the test unit, and the test unit is established to determine which voltage transformer under test is abnormal, and The on-line monitoring device does not know the abnormal amount, and by comparing the results calculated by itself with the results of the test unit, it can detect whether the on-line monitoring device can accurately judge the error change and the size of the detected transformer, and realize the on-line monitoring device. Compared with the existing test methods, it is closer to the actual operating conditions of the online monitoring device for the measurement performance of the voltage transformer, and the test content is more in line with the judgment principle of the measurement performance, and has a broad space for promotion.

Description of drawings

Exemplary embodiments of the present invention may be more fully understood by reference to the following drawings:

FIG. 1 is a schematic structural diagram of a system 100 for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention;

2 is an overall architecture diagram of a system for detecting the function and accuracy of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention;

FIG. 3 is a flow chart of a method 300 for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.

Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

FIG. 1 is a schematic structural diagram of a system 100 for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention. As shown in FIG. 1 , the system for detecting the monitoring performance of the on-line monitoring device for measuring the measurement performance of the voltage transformer provided by the embodiment of the present invention adopts the power frequency power supply to apply the rated voltage source to the standard voltage transformer and the voltage transformer under test, and simulates the operation. The power supply of the voltage transformer, and then adjust the error of one or more voltage transformers under test through the error adjustment unit, and push the adjusted error to the test unit, and establish a test unit to determine which voltage transformer to be tested. If there is an abnormality and the amount of abnormality, the online monitoring device does not know it. By comparing the results calculated by itself with the results of the test unit, it can detect whether the online monitoring device can accurately judge the error change and the size of the detected transformer. The function judgment and accuracy evaluation of the online monitoring device; compared with the existing test methods, it is closer to the actual operating conditions of the online monitoring device for the measurement performance of the voltage transformer, and the test content is more in line with the judgment principle of the measurement performance. promotion space. The system 100 for detecting the monitoring performance of an on-line monitoring device for measuring performance of a voltage transformer provided by the embodiment of the present invention includes: a power frequency program-controlled power supply 101 , a standard voltage transformer unit 102 , a detected voltage transformer unit 103 , and a secondary load unit 104 , an error adjustment unit 105 , an online monitoring device 106 and a testing unit 107 .

Preferably, the industrial frequency program-controlled power supply 101 is respectively connected with the standard voltage transformer unit and the tested voltage transformer unit, and is used to provide a voltage power source for the standard voltage transformer unit and the tested voltage transformer unit.

In the embodiment of the present invention, the power frequency program-controlled power supply can change the frequency of the power supply, the frequency range is 49.5Hz-50.5Hz, and can also provide the 3rd harmonic, the 5th harmonic and the 7th harmonic.

Preferably, the standard voltage transformer unit 102 is respectively connected with the online monitoring device and the testing unit, and is used to output the first voltage signal to the online testing device and the testing unit in real time.

Preferably, the detected voltage transformer unit 103 is respectively connected with the online monitoring device and the testing unit, and is used for outputting the second voltage signal to the online monitoring device and the testing unit in real time.

Preferably, the standard voltage transformer unit includes: a set of standard voltage transformers for measuring the voltages of A-phase, B-phase and C-phase respectively; the detected voltage transformer unit includes: at least one group of respectively The voltage transformers under test for measuring the voltages of A-phase, B-phase and C-phase; among them, three are in a group.

In the embodiment of the present invention, the standard voltage transformer unit includes a plurality of standard voltage transformers, the detected voltage transformer unit includes a plurality of detected voltage transformers, and each standard voltage transformer and the detected voltage transformer The voltage ratio of the device is the same, that is, the primary voltage and the secondary voltage are the same. The voltage transformers in the standard voltage transformer unit are electromagnetic voltage transformers (VT), with an accuracy level of 0.01, a group of 3, which are respectively set in three phases A, B, and C, one for each phase; The voltage transformers in the voltage transformer unit are capacitive voltage transformers (CVT) with an accuracy level of 0.2. Two or three groups can be provided, a total of 6 or 9, which are set at A, B, and C respectively. Three-phase, 2 or 3 per phase. The error of each voltage transformer is tested by offline error detection, and the error is known. The output voltage signal of each voltage transformer is uploaded to the online monitoring device and testing unit in real time.

Preferably, the secondary load unit 104 is connected to the standard voltage transformer unit and the tested voltage transformer unit, respectively, for simulating an actual secondary load, and applying the secondary load to the On the output terminals of the secondary winding of the standard voltage transformer unit and the tested voltage transformer unit.

In the embodiment of the present invention, the secondary load unit is a secondary load box, which is used to simulate an actual secondary load and is applied to the output terminal of the secondary winding of the voltage transformer. In use, the secondary load of the standard voltage transformer and the tested voltage transformer can be the same or different. The secondary load box has multiple sets of independent output terminals, which can be used independently.

Preferably, the error adjustment unit 105 is respectively connected to the detected voltage transformer unit and the test unit, and is used to adjust the error of the detected voltage transformer unit and send the error adjustment value to the test unit unit.

Preferably, the range of the adjustment ratio difference of the error adjustment unit is [-0.500%, +0.500%], the step is 0.002%; the range of the adjustment phase difference is [-10.00', +10.00'], the step is is 0.02'.

In an embodiment of the present invention, the error adjustment unit is used to adjust the error of any one or more voltage transformers in the detected voltage transformer unit. The range of adjusting the ratio difference is [-0.500%, +0.500%], and the step is 0.002%; the range of adjusting the phase difference is [-10.00', +10.00'], and the step is 0.02'. Through the error adjustment unit, the error change of the detected voltage transformer, that is, the error adjustment value, can be accurately known. According to the error adjustment value, the test unit can determine the adjusted error of the detected voltage transformer after the error adjustment. The interior of the error adjustment unit is composed of a coil and a resistor, and the number of turns of the secondary winding of the electromagnetic unit of the voltage transformer can be simulated by changing the number of coil turns to achieve the purpose of changing the ratio difference; Number adjustment and coordination to achieve the purpose of changing the phase. In actual operation, the phase difference can be adjusted first, and then the ratio difference can be adjusted.

Preferably, the online monitoring device 106 is connected to the test unit, and is used for determining the first error value of the voltage transformer unit under test according to the first voltage signal and the second voltage signal.

In the embodiment of the present invention, the on-line monitoring device is the equipment to be tested. For any existing on-line monitoring device, the present invention only needs to determine the monitoring error according to the displayed data, without considering how the error is realized. monitored.

Preferably, the testing unit 107 is configured to determine the second error value of the detected voltage transformer unit according to the first voltage signal, the second voltage signal and the error adjustment value, according to the first error value and the second error value The error value determines the error value of the online monitoring device, and determines the monitoring performance of the online monitoring device according to the error value of the online monitoring device.

Preferably, the error value includes: a ratio difference value and a phase difference value.

Preferably, the determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

If the error-adjusted detected voltage transformer can be determined according to the error value of the online monitoring device, the ratio difference of the online monitoring device is within the first preset range, and the phase difference value is within the second preset range within, it is determined that the functionality and accuracy of the online monitoring device meet the requirements;

If the detected voltage transformer that has undergone error adjustment can be determined according to the error value of the online monitoring device, but the ratio difference value of the online monitoring device is not within the first preset range, or the phase difference value is not within the second preset range, Then it is determined that the functionality of the online monitoring device meets the requirements, but the accuracy does not meet the requirements;

If the detected voltage transformer that has undergone error adjustment cannot be determined according to the error value of the on-line monitoring device, it is determined that the functionality and accuracy of the on-line monitoring device do not meet the requirements.

In the embodiment of the present invention, the test unit has a built-in function analysis module and an accuracy analysis module. The testing unit determines the second error value of the detected voltage transformer unit according to the first voltage signal, the second voltage signal and the error adjustment value, and determines the error value of the online monitoring device according to the first error value and the second error value , and the monitoring performance of the online monitoring device is determined according to the error value of the online monitoring device. Specifically, if the error-adjusted voltage transformer under test can be determined according to the error value of the online monitoring device, and the ratio difference value of the online monitoring device is within the first preset range, and the phase difference value is within the second Within the preset range, it is determined that the functionality and accuracy of the on-line monitoring device meet the requirements; if the error-adjusted voltage transformer to be tested can be determined according to the error value of the on-line monitoring device, but the ratio of the on-line monitoring device The difference value is not within the first preset range, or the phase difference value is not within the second preset range, then it is determined that the functionality of the online monitoring device meets the requirements, but the accuracy does not meet the requirements; If the error value cannot determine the detected voltage transformer that has undergone error adjustment, it is determined that the functionality and accuracy of the on-line monitoring device do not meet the requirements. The first preset range is [-0.05%, +0.05%], and the second preset range is [-2.0', 2.0'].

FIG. 2 is an overall architecture diagram of a system for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention. As shown in Figure 2, the industrial frequency program-controlled power supply is respectively connected with the standard voltage transformer unit and the tested voltage transformer unit; the standard voltage transformer unit is respectively connected with the online monitoring device and the test unit; the tested voltage transformer unit The unit is connected with the online monitoring device and the test unit respectively; the secondary load unit is connected with the standard voltage transformer unit and the tested voltage transformer unit respectively; the error adjustment unit is respectively connected with the tested voltage transformer unit The unit is connected with the test unit; the online monitoring device is connected with the test unit. The standard voltage transformer unit includes: three standard voltage transformers, the three standard voltage transformers are respectively used to measure the voltages of A-phase, B-phase and C-phase; the detected voltage transformer unit includes: 6 There are six tested voltage transformers, and the six tested voltage transformers are divided into two groups. The three tested voltage transformers in each group are respectively used to measure the voltages of A-phase, B-phase and C-phase. The steps of detecting the monitoring performance of the voltage transformer metering performance online monitoring device include:

Step 1: Prepare the test equipment configuration, and design the detected voltage transformer unit with a rated primary voltage of 110kV to perform error monitoring. Then the power frequency program-controlled source adjusts the output rated voltage to 110kV, the frequency is set to 50Hz, and the 110kV voltage level VT is a total of 3 Branch as a standard, 0.01 level. Each tested voltage transformer has a rated primary voltage of 0.2, which is also 110kV, and the secondary load is adjusted to 1VA. Connect the secondary output of the standard voltage transformer unit and the secondary output of the tested voltage transformer unit to the online respectively. The signal input end of the monitoring device and the signal input end of the test unit, in addition, the signal output end of the online monitoring device is connected to the signal input end of the test unit, and the preparation work is completed.

Step 2, turn on the power supply, all test voltage transformers are charged, and the secondary signal is displayed on the online monitoring device and the test unit respectively. Due to the error of each voltage transformer in the standard voltage transformer unit and the tested voltage transformer unit It is known that the test unit shows the error of the tested voltage transformer tested with a higher accuracy level. At this time, you can directly compare whether the error value of the tested voltage transformer displayed on the online monitoring device is the same as that of the test unit. The error value on the above is the same, and the accuracy level of the online monitoring device can be known according to the difference between the two.

Step 3: Adjust the error value of the tested voltage transformer. Since the error adjustment unit only changes the tested voltage transformer, and can know which test voltage transformer error is changed, the error change is also considered to be set. This value can be input to the test unit, which is known to the test unit, but unknown to the online monitoring device, so the online monitoring device needs to analyze which one or several of the detected voltage transformers have changed through its internal calculation. , and calculate the error variation. Step 4: Compare whether the error change calculated on the online monitoring device is consistent with the known error adjustment pushed to the test unit, and determine the functionality and accuracy of the online monitoring device according to the calculated difference between the two.

For example, during the initial error adjustment, the errors of the voltage transformers to be tested are: the first group A, 0.100%, 1.00'; B, 0.100%, 1.00'; C, 0.100%, 1.00'; the second group A, -0.100%, -1.00'; B, -0.100%, -1.00'; C, -0.100%, -1.00'. These data are entered into the test unit at the beginning, but the online monitoring device does not know it, and the online device needs to calculate by the output signal of the standard voltage transformer collected and the output signal of the tested voltage transformer. After that, the error adjustment unit adjusts the second set of A-phase errors to -0.150%, -2.00'; B-phase errors to 0.050%, 0.00, and pushes the adjusted transformer error information to the test unit, then at this time at The detected voltage transformer errors displayed on the test unit are: the first group A, 0.100%, 1.00'; B, 0.100%, 1.00'; C, 0.100%, 1.00'; the second group A, -0.150%, - 2.00'; B, 0.050%, 0.00; C, -0.100%, -1.00'.

For the online monitoring device, if the analysis result is close to the test unit, it is qualified. For example, the analysis result is that the error of the detected voltage transformer is the first group A, 0.095%, 1.20'; B, 0.098%, 1.40'; C, 0.105% , 0.94'; the second group A, -0.145%, -2.10'; B, 0.055%, 0.10'; C, -0.130%, -0.78'. If the difference between the ratio difference and the standard value given by the test unit is within ±0.05%, and the difference in phase difference is within ±2.0', the function of the online monitoring device meets the design requirements, and the accuracy is 0.05. If the CVT that changes the error can be found accurately, but the absolute value of the ratio difference between the calculated error and the error given by the test unit is greater than 0.05%, and the absolute value of the phase difference difference is greater than 2.0', the function meets the requirements but the accuracy Does not meet the 0.05 level. If the analysis result of the online monitoring device shows that the error of the detected voltage transformer has not changed, the functionality does not meet the design requirements.

The test platform built by the embodiment of the present invention is close to the actual operating conditions of the online monitoring device for the measurement performance of the voltage transformer, and can simulate the voltage transformers running on different lines, and errors will change after one or more of them are abnormal. The standard transformer, the tested transformer and the error adjustment unit give signals to the online monitoring device in black box mode, and the real adjustment signal is pushed to the test unit. The test unit compares the difference between the calculation results of the online monitoring device and the real results to achieve Judgment and accuracy assessment of on-line monitoring device functionality. The range and step of the error adjustment unit are set after referring to the relevant standards of the transformer error detection, and the adjusted value can cover the accuracy adjustment requirements of the 0.02-level transformer. The accuracy level of the test platform is 0.02, and it has the ability to perform functional tests and accuracy tests on voltage transformers and online monitoring devices with a voltage range of 10kV-500kV. In the test platform, the voltage transformer operating in the actual project is used, and the accuracy level of the standard voltage transformer is set to 0.01, and the accuracy level of the tested voltage transformer is 0.2. In principle, the accuracy of the error is realized. Adjustment and judgment, have the ability to accurately test the online monitoring device; the overall test detection ability is 0.02, and it has the ability to test the accuracy level of the voltage transformer online monitoring device with an accuracy level of 0.05.

FIG. 3 is a flow chart of a method 300 for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention. As shown in FIG. 3 , the method 300 for detecting the monitoring performance of an on-line monitoring device for measuring performance of a voltage transformer provided by an embodiment of the present invention starts from step 301 , and in step 301 the power frequency program-controlled power supply is a standard voltage transformer unit and a detected voltage transformer unit. The voltage transformer unit provides the voltage power source.

Preferably, the standard voltage transformer unit includes: a set of standard voltage transformers for measuring the voltages of A-phase, B-phase and C-phase respectively; the detected voltage transformer unit includes: at least one group of respectively The voltage transformers under test for measuring the voltages of A-phase, B-phase and C-phase; among them, three are in a group.

In step 302, the standard voltage transformer unit outputs the first voltage signal to the online detection device and the test unit in real time, and the detected voltage transformer unit outputs the second voltage signal to the online monitoring device and the test unit in real time.

In step 303, the error adjustment unit adjusts the error of the detected voltage transformer unit, and sends the error adjustment value to the test unit.

Preferably, the range of the adjustment ratio difference of the error adjustment unit is [-0.500%, +0.500%], the step is 0.002%; the range of the adjustment phase difference is [-10.00', +10.00'], the step is is 0.02'.

In step 304, the online monitoring device determines the first error value of the detected voltage transformer unit according to the first voltage signal and the second voltage signal.

In step 305, the testing unit determines a second error value of the detected voltage transformer unit according to the first voltage signal, the second voltage signal and the error adjustment value, and determines the second error value according to the first error value and the second error value The error value of the online monitoring device is monitored, and the monitoring performance of the online monitoring device is determined according to the error value of the online monitoring device.

Preferably, the error value includes: a ratio difference value and a phase difference value.

Preferably, the determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

The determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

If the error-adjusted detected voltage transformer can be determined according to the error value of the online monitoring device, the ratio difference of the online monitoring device is within the first preset range, and the phase difference value is within the second preset range within, it is determined that the functionality and accuracy of the online monitoring device meet the requirements;

If the detected voltage transformer that has undergone error adjustment can be determined according to the error value of the online monitoring device, but the ratio difference value of the online monitoring device is not within the first preset range, or the phase difference value is not within the second preset range, Then it is determined that the functionality of the online monitoring device meets the requirements, but the accuracy does not meet the requirements;

If the detected voltage transformer that has undergone error adjustment cannot be determined according to the error value of the on-line monitoring device, it is determined that the functionality and accuracy of the on-line monitoring device do not meet the requirements.

The method 300 for detecting the monitoring performance of an on-line monitoring device for metering performance of a voltage transformer according to an embodiment of the present invention corresponds to the system 100 for detecting the monitoring performance of an on-line monitoring device for monitoring the metering performance of a voltage transformer according to another embodiment of the present invention. No longer.

The present invention has been described with reference to a few embodiments. However, as is known to those skilled in the art, other embodiments than the above disclosed invention are equally within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/the/the [means, component, etc.]" are open to interpretation as at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications or equivalent replacements are made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A system for detecting monitoring performance of a voltage transformer metering performance on-line monitoring device is characterized by comprising:

the power frequency program control power supply is respectively connected with the standard voltage transformer unit and the detected voltage transformer unit and is used for providing a voltage power source for the standard voltage transformer unit and the detected voltage transformer unit;

the standard voltage transformer unit is respectively connected with the online monitoring device and the testing unit and used for outputting a first voltage signal to the online monitoring device and the testing unit in real time;

the detected voltage transformer unit is respectively connected with the online monitoring device and the testing unit and is used for outputting a second voltage signal to the online monitoring device and the testing unit in real time;

the secondary load unit is respectively connected with the standard voltage transformer unit and the detected voltage transformer unit and is used for simulating an actual secondary load and applying the secondary load to output terminals of secondary windings of the standard voltage transformer unit and the detected voltage transformer unit;

the error adjusting unit is respectively connected with the detected voltage transformer unit and the testing unit and is used for adjusting the error of the detected voltage transformer unit and sending an error adjusting value to the testing unit;

the online monitoring device is connected with the test unit and used for determining a first error value of the detected voltage transformer unit according to the first voltage signal and the second voltage signal;

and the test unit is used for determining a second error value of the detected voltage transformer unit according to the first voltage signal, the second voltage signal and the error adjusting value, determining an error value of the online monitoring device according to the first error value and the second error value, and determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device.

2. The system according to claim 1, characterized in that the adjustment ratio difference of the error adjustment unit ranges from [ -0.500%, + 0.500% ], with a step of 0.002%; the range of the adjusting phase difference is [ -10.00', +10.00' ], and the step is 0.02 '.

3. The system of claim 1, wherein the error value comprises: ratio difference values and phase difference values.

4. The system of claim 1, wherein the standard voltage transformer unit comprises: a group of standard voltage transformers for measuring phase A, phase B and phase C voltages respectively; the detected voltage transformer unit comprises: at least one group of detected voltage transformers respectively used for measuring phase A, phase B and phase C voltages; wherein, three are in one group.

5. The system of claim 2, wherein determining the monitoring performance of the on-line monitoring device based on the error value of the on-line monitoring device comprises:

if the detected voltage transformer subjected to error adjustment can be determined according to the error value of the online monitoring device, the specific difference value of the online monitoring device is within a first preset range, and the phase difference value is within a second preset range, determining that both the functionality and the accuracy of the online monitoring device meet the requirements;

if the detected voltage transformer subjected to error adjustment can be determined according to the error value of the online monitoring device, but the specific difference value of the online monitoring device is not within a first preset range or the phase difference value is not within a second preset range, determining that the functionality of the online monitoring device meets the requirement, but the accuracy does not meet the requirement;

and if the detected voltage transformer subjected to error adjustment cannot be determined according to the error value of the online monitoring device, determining that the functionality and the accuracy of the online monitoring device do not meet the requirements.

6. A method for detecting the monitoring performance of an online voltage transformer metering performance monitoring device is characterized by comprising the following steps:

the power frequency program control power supply provides a voltage power source for the standard voltage transformer unit and the detected voltage transformer unit;

the standard voltage transformer unit outputs a first voltage signal to the online detection device and the test unit in real time, and the detected voltage transformer unit outputs a second voltage signal to the online monitoring device and the test unit in real time;

the error adjusting unit adjusts the error of the detected voltage transformer unit and sends an error adjusting value to the testing unit;

the online monitoring device determines a first error value of the detected voltage transformer unit according to the first voltage signal and the second voltage signal;

the test unit determines a second error value of the detected voltage transformer unit according to the first voltage signal, the second voltage signal and the error adjusting value, determines an error value of the online monitoring device according to the first error value and the second error value, and determines the monitoring performance of the online monitoring device according to the error value of the online monitoring device.

7. The method according to claim 6, characterized in that the adjustment ratio difference of the error adjustment unit ranges from-0.500%, + 0.500%, with a step of 0.002%; the range of the adjusting phase difference is [ -10.00', +10.00' ], and the step is 0.02 '.

8. The method of claim 6, wherein the error value comprises: ratio difference values and phase difference values.

9. The method of claim 6, wherein the standard voltage transformer unit comprises: a group of standard voltage transformers for measuring phase A, phase B and phase C voltages respectively; the detected voltage transformer unit comprises: at least one group of detected voltage transformers respectively used for measuring phase A, phase B and phase C voltages; wherein, three are in one group.

10. The method of claim 6, wherein determining the monitoring performance of the on-line monitoring device based on the error value of the on-line monitoring device comprises:

the determining the monitoring performance of the online monitoring device according to the error value of the online monitoring device includes:

if the detected voltage transformer subjected to error adjustment can be determined according to the error value of the online monitoring device, the specific difference value of the online monitoring device is within a first preset range, and the phase difference value is within a second preset range, determining that both the functionality and the accuracy of the online monitoring device meet the requirements;

if the detected voltage transformer subjected to error adjustment can be determined according to the error value of the online monitoring device, but the specific difference value of the online monitoring device is not within a first preset range or the phase difference value is not within a second preset range, determining that the functionality of the online monitoring device meets the requirement, but the accuracy does not meet the requirement;

and if the detected voltage transformer subjected to error adjustment cannot be determined according to the error value of the online monitoring device, determining that the functionality and the accuracy of the online monitoring device do not meet the requirements.

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