CN112834979A - Error comparison system and method for high-voltage electric energy metering device under simulated working condition - Google Patents
Error comparison system and method for high-voltage electric energy metering device under simulated working condition Download PDFInfo
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- CN112834979A CN112834979A CN202110354609.9A CN202110354609A CN112834979A CN 112834979 A CN112834979 A CN 112834979A CN 202110354609 A CN202110354609 A CN 202110354609A CN 112834979 A CN112834979 A CN 112834979A
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Abstract
The application relates to the field of error testing of high-voltage electric energy metering devices, in particular to an error comparison system of a high-voltage electric energy metering device under a simulated working condition, wherein a control unit of the application is respectively connected with a three-phase-shifting balance power supply and a control port of a three-phase self-boosting and self-current-rising integrated device; the output end of the three-phase-shifting balance power supply is connected with the input end of the three-phase self-boosting and self-boosting integrated device, and the output end of the three-phase self-boosting and self-boosting integrated device is respectively connected with the three-phase intelligent standard electric energy meter and the high-voltage electric energy metering device. And also relates to an error comparison method of the high-voltage electric energy metering device under the simulated working condition. The control unit controls the stable operation working condition of the high-voltage electric energy metering device, changes the voltage, the current and the phase position respectively to simulate the actual operation working condition of the high-voltage electric energy metering device, reads the electric energy values of the tested electric energy meter and the three-phase intelligent standard electric energy meter at the same moment, and quickly and accurately obtains the error change condition of the high-voltage electric energy metering device when the voltage, the current and the phase position change.
Description
Technical Field
The application relates to the technical field of error testing of high-voltage metering devices, in particular to an error comparison system and method for a high-voltage electric energy metering device under a simulation working condition.
Background
The high-voltage electric energy metering device comprises an electric energy meter and a combined mutual inductor, and the error of the high-voltage electric energy metering device is related to the error of the electric energy meter and the combined mutual inductor. The error of the electric energy meter is influenced by current and power factor, and the error of the combined mutual inductor is influenced by the ratio difference, phase difference and power factor angle of the mutual inductor. The ratio difference and the phase difference of the mutual inductor are influenced by voltage, current and secondary load of the mutual inductor.
Therefore, it can be seen from the above analysis that the error of the high voltage electric energy metering device is affected by the voltage, the current and the phase. Under the actual operation condition of the high-voltage electric energy metering device, the dynamic change of a high-voltage line causes the change of current, voltage and phase, so that the error of the high-voltage electric energy metering device changes along with the change of the current, the voltage and the phase, and the accuracy of electric energy metering is influenced. However, a test device and a corresponding method for researching the influence of voltage, current and phase factors on the error of the high-voltage electric energy metering device are lacked in the prior art.
Therefore, it is necessary to develop an error comparison system and method for an electric energy metering device, which can analyze the influence of voltage, current or phase factors on the error of the high-voltage electric energy metering device.
Disclosure of Invention
The application provides a system and a method for comparing errors of a high-voltage electric energy metering device under a simulation working condition so as to analyze the influence condition of voltage, current or phase factors on the errors of the high-voltage electric energy metering device.
The technical scheme adopted by the application is as follows:
an error comparison system of a high-voltage electric energy metering device under a simulated working condition comprises a three-phase-shifting balance power supply, a three-phase self-boosting and self-current-boosting integrated device, a three-phase intelligent standard electric energy meter and a control unit;
the control unit is respectively connected with the three-phase-shifting balance power supply and a control port of the three-phase self-boosting and self-current-rising integrated device; the output end of the three-phase-shifting balance power supply is connected with the input end of the three-phase self-boosting and self-current-boosting integrated device, and the output end of the three-phase self-boosting and self-current-boosting integrated device is respectively connected with the three-phase intelligent standard electric energy meter and the high-voltage electric energy metering device.
Furthermore, the three-phase-shift balanced power supply comprises a three-phase-shift voltage source and a three-phase-shift current source, and the input end of the experimental power supply is respectively connected with the input end of the three-phase-shift voltage source and the input end of the three-phase-shift current source; the output end of the three-phase-shifting voltage source is connected with a voltage input winding of the three-phase self-boosting and self-current-boosting integrated device, and the output end of the three-phase-shifting current source is connected with a current input winding of the three-phase self-boosting and self-current-boosting integrated device; and the standard voltage output winding of the three-phase self-boosting and self-current-boosting integrated device, the standard current output winding of the three-phase self-boosting and self-current-boosting integrated device and the three-phase intelligent standard electric energy meter are all connected.
Furthermore, the three-phase self-boosting and self-current-boosting integrated device further comprises a voltage sampling unit and a current sampling unit; the standard voltage output winding is connected with the input end of the voltage sampling unit, and the output end of the voltage sampling unit is connected with the input end of the control unit; the standard current output winding is connected with the input end of the current sampling unit, and the output end of the current sampling unit is respectively connected with the output end of the control unit.
Furthermore, the high-voltage electric energy metering device comprises a combined transformer and a tested electric energy meter, a high-voltage output end of the three-phase self-boosting and self-current-boosting integrated device is connected with a voltage input end of the combined transformer, a large-current output end of the three-phase self-boosting and self-current-boosting integrated device is connected with a current input end of the combined transformer, and an output end of the combined transformer is connected with the tested electric energy meter; the combined transformer comprises a voltage transformer and a current transformer.
The method for comparing the errors of the high-voltage electric energy metering device under the simulated working condition is based on the error comparison system of the high-voltage electric energy metering device under the simulated working condition, and comprises the following steps of:
the control unit controls the three-phase-shifting voltage source to enable the voltage input into the voltage transformer to be rated voltage Un all the time;
meanwhile, the control unit controls the three-phase-shifting current source to enable the rated current input into the current transformer to be 5% In, 20% In, 100% In and 120% In sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time length;
and calculating the difference between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length, so as to obtain the influence condition of different voltages on the error of the high-voltage electric energy metering device.
Further, the method also comprises the step of simulating the error influence of the voltage change on the high-voltage electric energy metering device, and specifically comprises the following steps:
the control unit controls the three-phase-shifting current source to enable the current input into the current transformer to be rated current In all the time;
meanwhile, the control unit controls the three-phase-shifting voltage source to enable the rated voltage input into the voltage transformer to be 80% Un, 100% Un and 120% Un in sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time length;
and calculating the difference between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length, so as to obtain the influence condition of the errors of the high-voltage electric energy metering device with different currents.
Further, the method also comprises the step of simulating the influence of phase change on the error of the high-voltage electric energy metering device, and specifically comprises the following steps:
controlling the output voltage of the three-phase-shift voltage source and the output current of the three-phase-shift current source through the control unit, so that the voltage and the current input into the high-voltage electric energy metering device are rated voltage Un and rated current In all the time;
meanwhile, the control unit controls the phase of the output voltage of the three-phase-shift voltage source and the phase of the output current of the three-phase-shift current source, so that the voltage phase angle and the current phase angle input into the high-voltage electric energy metering device within each fixed time length are respectively 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees in sequence;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time length;
and calculating the difference value between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length, so as to obtain the influence condition of different phases on the error of the high-voltage electric energy metering device.
The technical scheme of the application has the following beneficial effects:
according to the method, the stable operation working condition of the high-voltage electric energy metering device is controlled through the control unit, the voltage, the current and the phase are respectively changed to simulate the actual operation working condition of the high-voltage electric energy metering device, the electric energy values of the tested electric energy meter and the three-phase intelligent standard electric energy meter are read at the same moment, and the error change condition of the high-voltage electric energy metering device when the voltage, the current and the phase change is rapidly and accurately obtained.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an error comparison system of a high-voltage electric energy metering device under a simulated condition provided in an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Detailed description of the preferred embodiment
The application provides a system is compared to high-voltage electric energy metering device error under simulated condition. Referring to fig. 1, a schematic diagram of an error comparison system of a high-voltage electric energy metering device under a simulated condition provided in the embodiment of the present application is shown. The system for comparing the errors of the electric energy metering device under the simulated working condition comprises a three-phase-shifting balance power supply, a three-phase self-boosting and self-current-boosting integrated device, a three-phase intelligent standard electric energy meter and a control unit;
the control unit is respectively connected with a three-phase-shifting balance power supply and a control port of the three-phase self-boosting and self-current-rising integrated device; the output end of the three-phase-shifting balance power supply is connected with the input end of the three-phase self-boosting and self-boosting integrated device, and the output end of the three-phase self-boosting and self-boosting integrated device is respectively connected with the three-phase intelligent standard electric energy meter and the high-voltage electric energy metering device. And reading the electric energy value through a three-phase intelligent standard electric energy meter.
Specifically, the method comprises the following steps: the three-phase-shifting balanced power supply comprises a three-phase-shifting voltage source and a three-phase-shifting current source, the phase of the output voltage is 0-400V, the three-phase voltage can be adjusted, and the phase adjusting range is 0-360 degrees. The input end of the experimental power supply is respectively connected with the input end of the three-phase-shift voltage source and the input end of the three-phase-shift current source. The output end of the three-phase-shifting voltage source is connected with a voltage input winding of the three-phase self-boosting and self-current-boosting integrated device, and test voltage with amplitude and phase changes can be provided. The output end of the three-phase-shifting current source is connected with a current input winding of the three-phase self-boosting and self-current-boosting integrated device, and test current with amplitude and phase changes can be provided. And a standard voltage output winding of the three-phase self-boosting and self-current-boosting integrated device, a standard current output winding of the three-phase self-boosting and self-current-boosting integrated device and a three-phase intelligent standard electric energy meter are used for reading electric energy values through the three-phase intelligent standard electric energy meter.
The standard primary voltage of the three-phase self-boosting and self-current-boosting integrated device is 6kV to 35kV, the standard secondary voltage is 100V and 3V, and the standard primary current is 10A, 15A, 20A, 30A, 40A, 50, 75A, 100A, 150A, 200A, 300A, 400A, 500A, 600A, and the standard secondary current is 5A and 1A. The three-phase self-boosting and self-current-boosting integrated device comprises a voltage sampling unit and a current sampling unit which are respectively used for collecting standard voltage data and standard current data output by the three-phase self-boosting and self-current-boosting integrated device and feeding the standard voltage data and the standard current data back to the control unit.
The standard voltage output winding is connected with the input end of the voltage sampling unit, and the output end of the voltage sampling unit is connected with the input end of the control unit; the standard current output winding is connected with the input end of the current sampling unit, and the output end of the current sampling unit is respectively connected with the output end of the control unit.
The high-voltage electric energy metering device comprises a combined transformer and a tested electric energy meter. The high-voltage output end of the three-phase self-boosting and self-current-boosting integrated device is connected with the voltage input end of the combined transformer, the large-current output end of the three-phase self-boosting and self-current-boosting integrated device is connected with the current input end of the combined transformer, and the output end of the combined transformer is connected with a tested electric energy meter; the combined transformer comprises a voltage transformer and a current transformer. And reading the electric energy value through the tested electric energy meter.
Detailed description of the invention
Adopt the error comparison system of this application to carry out error analysis to high-voltage electric energy metering device, including the error influence that the simulation current change produced high-voltage electric energy metering device, specifically include following step:
the control unit controls the three-phase-shifting voltage source to enable the voltage input into the voltage transformer to be rated voltage Un all the time;
meanwhile, the control unit controls the three-phase-shifting current source to enable the rated current of the input current transformer to be 5% In, 20% In, 100% In and 120% In sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time;
and calculating the difference between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length to obtain the influence condition of different voltages on the error of the high-voltage electric energy metering device.
Detailed description of the preferred embodiment
Adopt the system of this application to carry out error analysis to high-voltage electric energy metering device, still include the error influence that the analog voltage change produced high-voltage electric energy metering device, specifically include following step:
the control unit controls the three-phase-shifting current source to enable the current input into the current transformer to be rated current In all the time;
meanwhile, the control unit controls the three-phase-shifting voltage source to enable the rated voltage of the input voltage transformer to be 80% Un, 100% Un and 120% Un in sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time;
and calculating the difference value between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time period, so as to obtain the influence condition of the errors of the high-voltage electric energy metering devices with different currents.
Detailed description of the invention
Adopt the system of this application to carry out error analysis to high-voltage electric energy metering device, still include the error influence that simulation phase place change produced high-voltage electric energy metering device, specifically include following step:
controlling the output voltage of the three-phase-shift voltage source and the output current of the three-phase-shift current source through the control unit, so that the voltage and the current input into the high-voltage electric energy metering device are rated voltage Un and rated current In all the time;
meanwhile, the phase of the output voltage of the three-phase-shift voltage source and the phase of the output current of the three-phase-shift current source are controlled by the control unit, so that the voltage phase angle and the current phase angle input into the high-voltage electric energy metering device within each fixed time length are respectively 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees in sequence;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time;
and calculating the difference value between the electric energy value of the three-phase intelligent standard electric energy meter in each fixed time length and the electric energy value of the tested electric energy meter, so as to obtain the influence condition of different phases on the error of the high-voltage electric energy metering device.
Detailed description of the preferred embodiment
Adopt the error comparison system of this application to carry out error analysis to rated primary voltage 10kV, rated primary current 600A's high-voltage electric energy metering device, specifically include: and respectively analyzing the influence of current change, voltage change and phase change on the error of the electric energy metering device.
Analyzing the error influence condition of the current transformation high-voltage electric energy metering device, comprising: the control unit controls the three-phase-shifting voltage source to enable the voltage input into the voltage transformer to be 10KV of rated voltage all the time;
meanwhile, the control unit controls the three-phase-shifting current source to enable the rated current of the input current transformer to be 30A, 120A, 600A and 720A in sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time;
and calculating the difference between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length to obtain the influence condition of different voltages on the error of the high-voltage electric energy metering device. The fixed duration may be set to 1 hour.
Still include the error influence condition of analysis voltage change high-voltage electric energy metering device, include: the control unit controls the three-phase-shifting current source to enable the current input into the current transformer to be the rated current 600A all the time;
meanwhile, the control unit controls the three-phase-shifting voltage source to enable the rated voltage of the input voltage transformer to be 8kV, 10kV and 12kV in sequence within each preset time length;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time;
and calculating the difference value between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time period, so as to obtain the influence condition of the errors of the high-voltage electric energy metering devices with different currents.
Still include the error influence condition of analysis phase change to high-voltage electric energy metering device, include: the output voltage of the three-phase-shift voltage source and the output current of the three-phase-shift current source are controlled by the control unit, so that the voltage and the current input into the high-voltage electric energy metering device are rated voltage Un which is 10KV and rated current In which is 600A all the time;
meanwhile, the phase of the output voltage of the three-phase-shift voltage source and the phase of the output current of the three-phase-shift current source are controlled by the control unit, so that the voltage phase angle and the current phase angle input into the high-voltage electric energy metering device within each fixed time length are respectively 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees in sequence;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time;
and calculating the difference value between the electric energy value of the three-phase intelligent standard electric energy meter in each fixed time length and the electric energy value of the tested electric energy meter, so as to obtain the influence condition of different phases on the error of the high-voltage electric energy metering device.
According to the method, the stable operation working condition of the high-voltage electric energy metering device is controlled through the control unit, the voltage, the current and the phase are respectively changed to simulate the actual operation working condition of the high-voltage electric energy metering device, the electric energy values of the tested electric energy meter and the three-phase intelligent standard electric energy meter are read at the same moment, and the error change condition of the high-voltage electric energy metering device when the voltage, the current and the phase are changed is rapidly and accurately obtained.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (7)
1. An error comparison system of a high-voltage electric energy metering device under a simulated working condition is characterized by comprising a three-phase-shifting balance power supply, a three-phase self-boosting and self-current-rising integrated device, a three-phase intelligent standard electric energy meter and a control unit;
the control unit is respectively connected with the three-phase-shifting balance power supply and a control port of the three-phase self-boosting and self-current-rising integrated device; the output end of the three-phase-shifting balance power supply is connected with the input end of the three-phase self-boosting and self-current-boosting integrated device, and the output end of the three-phase self-boosting and self-current-boosting integrated device is respectively connected with the three-phase intelligent standard electric energy meter and the high-voltage electric energy metering device.
2. The error comparison system of the high-voltage electric energy metering device under the simulated working condition according to claim 1, wherein the three-phase-shift balanced power supply comprises a three-phase-shift voltage source and a three-phase-shift current source, and the input end of the experimental power supply is respectively connected with the input end of the three-phase-shift voltage source and the input end of the three-phase-shift current source; the output end of the three-phase-shifting voltage source is connected with a voltage input winding of the three-phase self-boosting and self-current-boosting integrated device, and the output end of the three-phase-shifting current source is connected with a current input winding of the three-phase self-boosting and self-current-boosting integrated device; and the standard voltage output winding of the three-phase self-boosting and self-current-boosting integrated device, the standard current output winding of the three-phase self-boosting and self-current-boosting integrated device and the three-phase intelligent standard electric energy meter are all connected.
3. The system for comparing the errors of the high-voltage electric energy metering device under the simulated working condition according to claim 2, wherein the three-phase self-boosting and self-current-boosting integrated device further comprises a voltage sampling unit and a current sampling unit; the standard voltage output winding is connected with the input end of the voltage sampling unit, and the output end of the voltage sampling unit is connected with the input end of the control unit; the standard current output winding is connected with the input end of the current sampling unit, and the output end of the current sampling unit is respectively connected with the output end of the control unit.
4. The system according to claim 2, wherein the high-voltage electric energy metering device comprises a combined transformer and a tested electric energy meter, a high-voltage output end of the three-phase self-boosting and self-current-boosting integrated device is connected with a voltage input end of the combined transformer, a large-current output end of the three-phase self-boosting and self-current-boosting integrated device is connected with a current input end of the combined transformer, and an output end of the combined transformer is connected with the tested electric energy meter; the combined transformer comprises a voltage transformer and a current transformer.
5. An error comparison method for a high-voltage electric energy metering device under a simulated working condition is characterized in that based on the error comparison system for the high-voltage electric energy metering device under the simulated working condition of any one of claims 1 to 4, the method comprises the step of simulating the error influence of current change on the high-voltage electric energy metering device, and specifically comprises the following steps:
the control unit controls the three-phase-shifting voltage source to enable the voltage input into the voltage transformer to be rated voltage Un all the time;
meanwhile, the control unit controls the three-phase-shifting current source to enable the rated current input into the current transformer to be 5% In, 20% In, 100% In and 120% In sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time length;
and calculating the difference between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length, so as to obtain the influence condition of different voltages on the error of the high-voltage electric energy metering device.
6. The method for comparing the errors of the high-voltage electric energy metering device under the simulated working condition according to claim 5, wherein the method further comprises simulating the error influence of voltage change on the high-voltage electric energy metering device, and specifically comprises the following steps:
the control unit controls the three-phase-shifting current source to enable the current input into the current transformer to be rated current In all the time;
meanwhile, the control unit controls the three-phase-shifting voltage source to enable the rated voltage input into the voltage transformer to be 80% Un, 100% Un and 120% Un in sequence within each fixed time period;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time length;
and calculating the difference between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length, so as to obtain the influence condition of the errors of the high-voltage electric energy metering device with different currents.
7. The method for comparing the errors of the high-voltage electric energy metering device under the simulated working condition according to claim 5, wherein the method further comprises simulating the error influence of phase change on the high-voltage electric energy metering device, and specifically comprises the following steps:
controlling the output voltage of the three-phase-shift voltage source and the output current of the three-phase-shift current source through the control unit, so that the voltage and the current input into the high-voltage electric energy metering device are rated voltage Un and rated current In all the time;
meanwhile, the control unit controls the phase of the output voltage of the three-phase-shift voltage source and the phase of the output current of the three-phase-shift current source, so that the voltage phase angle and the current phase angle input into the high-voltage electric energy metering device within each fixed time length are respectively 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees in sequence;
sequentially recording the electric energy values in the three-phase intelligent standard electric energy meter and the tested electric energy meter in each fixed time length;
and calculating the difference value between the electric energy value of the three-phase intelligent standard electric energy meter and the electric energy value of the tested electric energy meter in each fixed time length, so as to obtain the influence condition of different phases on the error of the high-voltage electric energy metering device.
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| CN105548948A (en) * | 2016-01-28 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | Device and method for testing digitalization electric energy metering system |
| CN106371048A (en) * | 2016-08-31 | 2017-02-01 | 安徽赛福电子有限公司 | Programmable digital integration phase shifter |
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