CN212622870U - Voltage and current split type electric energy quality measuring device for intelligent substation - Google Patents
Voltage and current split type electric energy quality measuring device for intelligent substation Download PDFInfo
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- CN212622870U CN212622870U CN202021419036.0U CN202021419036U CN212622870U CN 212622870 U CN212622870 U CN 212622870U CN 202021419036 U CN202021419036 U CN 202021419036U CN 212622870 U CN212622870 U CN 212622870U
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Abstract
The utility model discloses a voltage and current split type electric energy quality measuring device for an intelligent substation, which can simultaneously measure voltage type and current type electric energy quality indexes, wherein measuring signals are respectively taken from a merging unit front end analog voltage signal and a current signal, and the electric energy quality indexes such as harmonic waves and the like are accurately obtained, thereby solving the problem that a digital electric energy quality measuring device cannot measure high-order harmonic waves and the measuring indexes in the traditional analog signal measuring method are incomplete; the voltage measurement module and the current measurement module are respectively and independently arranged, a plurality of voltage signal measurement channels and current signal measurement channels are respectively arranged on the voltage measurement module and the current measurement module, the voltage measurement module and the current measurement module are both electrically connected with the high-precision clock wireless synchronization module, the voltage signal measurement channels and the current signal measurement channels are respectively and electrically connected with the voltage measurement screen and the current measurement screen, and the voltage measurement screen and the current measurement screen are both electrically connected with the merging unit.
Description
Technical Field
The utility model relates to a split type electric energy quality measurement device of voltage electric current for intelligent substation belongs to electric energy quality measurement technical field.
Background
Intelligent substations are increasingly popular and undertake the tasks of conversion and transmission of electric energy. As power loads are more and more power electronic, the problem of power quality such as harmonic waves is more and more prominent. However, most of the current intelligent transformer substations have the voltage and current and signal sampling frequency of 4kHz and insufficient sampling frequency, and cannot meet the requirement of accurate measurement of electric energy quality indexes such as harmonic waves, particularly higher harmonics. At present, the electric energy quality test methods of the intelligent substation mainly comprise the following steps:
the first method is digital signal measurement. The method adopts a digital power quality test analyzer to acquire digital signals at the output end of a merging unit of the intelligent substation. Because the sampling frequency of the digital signal of the merging unit is 4kHz, and the harmonic transmission characteristic influence of the mutual inductor anti-aliasing filter for the merging unit instrument, only 13 harmonics can be accurately tested.
The second method is conventional analog signal measurement. The method adopts an analog electric energy quality test analyzer, and signals are obtained from analog signals of a mutual inductor input at the front end of a merging unit. The method has accurate test results, but is limited by the installation positions of the on-site voltage control cubicle and the current control cubicle of the intelligent substation, the voltage control cubicle and the current control cubicle are independent from each other and are far away from each other, and the simultaneous measurement of voltage and current is difficult.
The third method is a specific analog-to-digital conversion method for harmonic measurement. The method utilizes the special local module for high-precision harmonic measurement to collect voltage and current waveform data and then calculate the harmonic, can accurately measure the harmonic, increases the special local module and the measurement link, makes the communication protocol of the special local module and the digital measurement device complicated, and increases the difficulty and the cost of the on-site harmonic test of the intelligent station.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art exists not enough, a split type electric energy quality measuring device of voltage electric current for intelligent substation is provided, can simultaneous measurement voltage class and electric current class electric energy quality index, measuring signal is got respectively from merging unit front end analog voltage and current signal, electric energy quality indexes such as accurate acquisition harmonic have solved digital electric energy quality measuring device and can not survey the problem that the index is incomplete in high order harmonic and the traditional analog signal measurement method.
In order to solve the technical problem, the utility model discloses a technical scheme be: the voltage and current split type electric energy quality measuring device for the intelligent substation comprises a voltage measuring module, a current measuring module, a voltage signal measuring channel, a current signal measuring channel and a high-precision clock wireless synchronization module, wherein the voltage measuring module and the current measuring module are respectively and independently arranged and are respectively used for collecting analog waveform sampling signals of voltage and current, the voltage measuring module and the current measuring module are respectively and fixedly arranged in a voltage control cabinet and a current control cabinet, a plurality of voltage signal measuring channels and current signal measuring channels are respectively arranged on the voltage measuring module and the current measuring module, and the voltage measuring module and the current measuring module can be correspondingly provided with transformation ratio parameters of the voltage signal measuring channels and the current signal measuring channels; the voltage measuring module and the current measuring module are both electrically connected with the high-precision clock wireless synchronization module, so that clocks of the voltage measuring module and the current measuring module are kept synchronous, and the obtained voltage waveform data and the obtained current waveform data are ensured to be synchronous; the voltage signal measuring channel and the current signal measuring channel are respectively electrically connected with the voltage measuring screen and the current measuring screen, the voltage measuring screen and the current measuring screen are both electrically connected with the merging unit, and the voltage measuring screen, the current measuring screen and the merging unit are both internally provided with control modules provided with electric energy quality analysis software, so that electric energy parameters can be displayed independently and can be displayed in a merging manner.
The voltage measuring module and the current measuring module can be used for independent measurement or combined use.
Compared with the prior art, the utility model beneficial effect who has is: the utility model discloses the voltage signal of measurement object in the well voltage signal measurement passageway inserts voltage screen, the current signal who corresponds measurement object in the current signal measurement passageway inserts current screen, the transformation ratio parameter of configuration voltage signal measurement passageway and current signal measurement passageway, dispose the wireless synchronization module of high accuracy clock, the clock that makes voltage measurement module and current measurement module keeps synchronous, the voltage waveform data and the synchronization of current waveform data that guarantee to obtain, utilize voltage waveform data analysis harmonic voltage, the electric energy quality index of voltage class such as voltage flicker; utilize current waveform data analysis harmonic current, class electric energy quality index such as unbalanced current, utilize synchronous voltage waveform data and current waveform data, superpose the calculation, analysis harmonic power, class electric energy quality index such as idle, the utility model discloses ability simultaneous measurement voltage class and class electric energy quality index, measuring signal are got respectively from merging cells front end analog voltage and current signal, and electric energy quality index such as accurate acquisition harmonic has solved digital electric energy quality measuring device and can not survey the incomplete problem of measuring index in high order harmonic and the traditional analog signal measuring method.
Drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is the utility model discloses well voltage measurement module and current measurement module built-up connection schematic diagram.
In the figure: the device comprises a voltage measuring module 1, a current measuring module 2, a voltage signal measuring channel 3, a current signal measuring channel 4, a high-precision clock wireless synchronization module 5, a voltage measuring screen 6, a current measuring screen 7 and a merging unit 8.
Detailed Description
As shown in fig. 1 and fig. 2, the utility model relates to a split type electric energy quality measurement device of voltage electric current for intelligent substation includes: the voltage measuring module 1, the current measuring module 2, the voltage measuring module 1 are provided with a voltage signal measuring channel 3, the current measuring module 2 is provided with a current signal measuring channel 4, and the voltage measuring module 1 and the current measuring module 2 are respectively provided with a high-precision clock wireless synchronization module 5. The voltage measuring module 1 and the current measuring module 2 are independent devices respectively, collect analog waveform sampling signals of voltage and current respectively, can perform independent measurement, and can also be flexibly combined for use.
The utility model relates to a split type electric energy quality measurement method of voltage electric current for intelligent substation, including following step:
the first step is as follows: the voltage signal measuring channel 3 is connected with a voltage analog signal in the voltage sink control cabinet, the current signal measuring channel 4 is connected with a corresponding current analog signal in the current sink control cabinet, and the transformation ratio parameters of the voltage signal measuring channel 3 and the current signal measuring channel 4 are configured;
the second step is that: a high-precision clock wireless synchronization module 5 is configured to keep the clocks of the voltage measurement module 1 and the current measurement module 2 synchronous, so that the obtained voltage waveform data and the obtained current waveform data are ensured to be synchronous;
the third step: analyzing the power quality indexes of voltage types such as voltage deviation, harmonic voltage, voltage flicker and the like by using voltage waveform data; analyzing current type power quality indexes such as harmonic current, unbalanced current and the like by using current waveform data;
the fourth step: and developing or utilizing voltage and current data comprehensive analysis software, such as PQViewer software, and utilizing synchronous voltage waveform data and current waveform data to perform superposition calculation and analyze power quality indexes such as harmonic power, reactive power and the like.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (2)
1. A split type electric energy quality measuring device of voltage electric current for intelligent substation, its characterized in that, including voltage measurement module (1), current measurement module (2), voltage signal measurement passageway (3), current signal measurement passageway (4) and high accuracy clock wireless synchronization module (5), voltage measurement module (1) and current measurement module (2) independent setting respectively are used for gathering the analog waveform sampling signal of voltage and electric current respectively, voltage measurement module (1) and current measurement module (2) are fixed the setting respectively in voltage collection accuse cabinet and current collection accuse cabinet, just be provided with a plurality of voltage signal measurement passageways (3) and current signal measurement passageway (4) on voltage measurement module (1) and current measurement module (2) respectively, configuration voltage signal measurement passageway (3) and current signal measurement passageway (4) that voltage measurement module (1) and current measurement module (2) can correspond A transformation ratio parameter; the voltage measuring module (1) and the current measuring module (2) are electrically connected with the high-precision clock wireless synchronization module (5), so that clocks of the voltage measuring module (1) and the current measuring module (2) are kept synchronous, and the obtained voltage waveform data and the obtained current waveform data are ensured to be synchronous; voltage signal measurement passageway (3) and current signal measurement passageway (4) are connected with voltage measurement screen (6) and current measurement screen (7) electricity respectively, voltage measurement screen (6) and current measurement screen (7) all are connected with merging cells (8) electricity, all be provided with the control module who installs electric energy quality analysis software in voltage measurement screen (6) and current measurement screen (7) and merging cells (8) for the electric energy parameter can show alone also can merge the demonstration.
2. The voltage-current split type power quality measuring device for the intelligent substation according to claim 1, wherein the voltage measuring module (1) and the current measuring module (2) can be independently measured or used in combination.
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| CN202021419036.0U CN212622870U (en) | 2020-07-18 | 2020-07-18 | Voltage and current split type electric energy quality measuring device for intelligent substation |
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| CN202021419036.0U CN212622870U (en) | 2020-07-18 | 2020-07-18 | Voltage and current split type electric energy quality measuring device for intelligent substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650465A (en) * | 2020-07-18 | 2020-09-11 | 国网山西省电力公司电力科学研究院 | Voltage and current split type electric energy quality measuring device and method for intelligent substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650465A (en) * | 2020-07-18 | 2020-09-11 | 国网山西省电力公司电力科学研究院 | Voltage and current split type electric energy quality measuring device and method for intelligent substation |
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