CN113848525A - Intelligent monitoring device for CVT metering error state - Google Patents
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- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The utility model relates to a measurement voltage transformer technical field provides an intelligent monitoring devices of CVT measurement error state, and the device is including data collection station, data repeater, cloud data server and the data reception treater of order connection. According to the ground current monitoring method and device, the CVT ground current is collected by the data collector with the micro opening, then the collected CVT ground current data is subjected to combined processing, analysis and output through the data repeater, the cloud data server, the data receiving processor and the like, and finally real-time dynamic monitoring of the CVT metering error state is achieved; the data output by the CVT metering error diagnosis method can be compared with historical statistical data, and therefore accuracy and instantaneity of CVT metering error diagnosis are improved.
Description
Technical Field
The application relates to the technical field of metering voltage transformers, in particular to an intelligent monitoring device for a CVT metering error state.
Background
The Capacitor Voltage Transformer (CVT) is used as an important primary device of an electric energy metering device and mainly comprises high-voltage and low-voltage capacitive voltage dividers, an electromagnetic unit (electromagnetic voltage transformer) and other elements, the stability and the accuracy of the CVT are influenced by a plurality of factors, the two most critical factors are a ratio error and a phase error, the accuracy of electric quantity settlement can be directly influenced as long as the two indexes are out of tolerance, and huge economic losses can be brought to both sides of trade, so the CVT metering error is concerned about the fairness and the fairness of the electric quantity settlement.
The conventional Capacitive Voltage Transformer (CVT) metering error diagnosis generally adopts a manual regular field verification mode, but the manual field operation mode needs to carry out steps of checking, finding, diagnosing, processing and the like, the processing timeliness is low, the user acceptance is low, great challenges are brought to electric quantity compensation and normal trade settlement, and the contradiction between the conventional Capacitive Voltage Transformer (CVT) metering error diagnosis and the development trend of safety, stability and mutual trust power utilization is increasingly deepened.
In recent years, in field first detection and periodic detection of a Capacitor Voltage Transformer (CVT), a plurality of cases of measurement over-errors of the capacitor voltage transformer occur, and according to statistics, the disqualification rate of the measurement errors accounts for about 10% of the total amount of detection cases, and the high-proportion over-errors seriously restrict high-quality operation and maintenance of the gateway electric energy metering device.
Therefore, there is a need for a device capable of monitoring the metering error status of the CVT in real time to improve the accuracy and real-time performance of the metering error diagnosis.
Disclosure of Invention
In order to overcome the deficiency of prior art, this application aims at providing a small-size intelligent CVT metering error state's on-line monitoring device, can real-time supervision metering error state, and can realize with historical statistics's comparison to solve the lower and relatively poor technical problem of real-time nature of metering error detection's rate of accuracy.
In order to achieve the above object, the present application provides an intelligent monitoring device for a metering error state of a CVT, specifically comprising: the system comprises a data acquisition unit, a data relay, a cloud data server and a data receiving processor which are sequentially connected.
The data acquisition unit is used for acquiring CVT grounding current, processing the CVT grounding current to obtain processed data and sending the processed data to the data repeater.
The data repeater is in communication connection with the data collector and is used for receiving the processed data, packaging the processed data to obtain packaged data, and transmitting the packaged data to the cloud data server.
And the cloud data server operates in a public network environment and is used for storing and forwarding the packed data.
The data receiving processor is connected with the cloud data server through a network, and is used for reading the packed data from the cloud data server and carrying out standardized processing on the packed data to obtain data in a standard format; and the data processing device is used for monitoring and analyzing the standard format data in real time to obtain an analysis result, and storing and displaying the standard format data and the analysis result.
Further, the data receiving processor may be directly connected to the data collector through an antenna, and configured to obtain the processed data, and perform standardized processing on the processed data to obtain data in a standard format.
Further, the data collector comprises: the system comprises an open-close type mutual inductor, a signal processing and A/D acquisition module, a first microprocessor and a first 433M wireless module which are sequentially connected.
The open-close type mutual inductor is sleeved on a CVT end screen grounding wire and used for transmitting and transforming CVT grounding current.
The signal processing and A/D acquisition module is used for converting the CVT grounding current into voltage data and carrying out high-precision sampling on the voltage data to obtain sampling data.
The first microprocessor is used for processing the sampling data to obtain processing data.
The first 433M wireless module is configured to send the processed data to a data relay or a data receiving processor.
Further, the sampling frequency of the signal processing and A/D acquisition module is set to be 10 kHz.
Further, the data repeater includes: a second 433M wireless module, a second microprocessor, and a 4G wireless module.
And the second 433M wireless module is connected with the data collector through an antenna and is used for receiving the processing data.
And the second micro processor is used for packaging the processing data to obtain packaged data.
The 4G wireless module is used for sending the packed data to the cloud data server.
Further, the data reception processor includes: a third 433M wireless module, an RJ45 ethernet module, a third microprocessor, a storage module, and a display module.
And the third 433M wireless module is connected with the data collector through an antenna and is used for acquiring the processing data.
And the RJ45 Ethernet module is connected with the cloud data server through a network and is used for reading the packaged data.
And the third microprocessor is used for carrying out standardized processing on the processed data or the packed data to obtain data in a standard format, and carrying out real-time monitoring and analysis on the data in the standard format to obtain an analysis result.
The storage module is used for storing the standard format data and the analysis result.
And the display module is used for displaying the standard format data and the analysis result and also used for manually setting parameters.
Further, the standard format data is EXCEL format data, and the EXCEL format data is provided with a time stamp and can be directly output to the mobile hard disk through the storage module.
Further, the display module is a 3.5-inch touch screen.
The application provides an intelligent monitoring devices of CVT measurement error state, and the device includes data collection station, data repeater, cloud data server and the data receiving processor that the order is connected. According to the ground current monitoring system, the CVT is used for collecting ground current through the data collector with the micro opening, then the collected ground current data of the CVT are subjected to combined processing, analysis and output through the data repeater, the cloud data server, the data receiving processor and the like, and finally real-time dynamic monitoring of the metering error state of the CVT is achieved. The data output by the CVT metering error diagnosis method can be compared with historical statistical data, and therefore accuracy and instantaneity of CVT metering error diagnosis are improved.
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 structural diagram of an intelligent monitoring device for a metering error state of a CVT according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a data collector provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a data repeater according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a data receiving processor according to an embodiment of the present application;
fig. 5 is a schematic diagram of a real-time monitoring data change curve provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be fully and clearly described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate understanding of technical solutions of the embodiments of the present application, some concepts related to the embodiments of the present application are first described below.
The Capacitor Voltage Transformer (CVT) is one of key devices for signal acquisition in a power system, is widely applied to the power system with the voltage level higher than 110kV and above due to good insulating property and economy, and has more obvious advantages. However, compared with the conventional electromagnetic voltage transformer, the capacitive voltage transformer has a complex structure, and the metering error state is easily affected by various factors in the operation process, so that the stability is low. As a measuring device, the long-term stability of the metering error is one of the most important parameters for measuring the operation performance of the capacitor voltage transformer.
At present, the error state evaluation method of the capacitor voltage transformer is to compare and detect errors by using a standard device and the calibrated capacitor voltage transformer in a power failure state within a certain operation period, and is time-consuming and labor-consuming, and needs a large amount of on-site large-scale test equipment, so that the implementation rate is low. Because the power failure operation of the high-voltage power transmission and transformation line is difficult, a large number of capacitor voltage transformers are in an over-verification periodic operation state, and metering errors have an over-tolerance risk, so that certain hidden dangers are caused to fair trade settlement of electric energy. In addition, the CVT metering error change is a gradual change process, so that the change state of the CVT cannot be accurately obtained through breakpoint or periodic detection, and the existing periodic power failure detection mode cannot meet the operation requirement of the intelligent substation on online monitoring of the state of key equipment. How to realize the state evaluation and prediction of the metering error of the capacitor voltage transformer under the condition of no power failure is a difficult problem to be solved urgently to ensure the safe, stable and economic operation of the intelligent power grid. Therefore, the embodiment of the application provides an intelligent monitoring device, can real-time supervision CVT metering error change, in case the unusual will early warning and suggestion appear.
Further, the prior art generally takes the secondary voltage as a criterion, and the metering secondary circuit is not generally allowed to be connected with other equipment, so that the metering secondary circuit is difficult to realize in the field. Because CVT ground current can reflect CVT measurement error state, this application embodiment adopts miniature open-ended current sensor to gather CVT ground current, then through the joint processing of devices such as data repeater, cloud data server, data receiving processor, realizes the dynamic monitoring of CVT measurement error state, and need not to carry out voltage sampling at measurement secondary circuit, just can carry out synchronous sampling to the ground current of whole transformer substation, so this application embodiment easily realizes.
In the embodiment of the present application, the specific state monitoring logic is: the method comprises the steps of firstly obtaining bus three-phase CVT grounding current and line three-phase CVT grounding current in the whole transformer substation, and then judging the state of a metering error by comparing the difference between the bus three-phase CVT grounding current and the line three-phase CVT grounding current. If the grounding currents of the three-phase CVT of the bus and the line are simultaneously increased or decreased, namely the change trends are consistent, judging that the CVT is normal; if the change trend of the three-phase grounding current of the bus CVT is inconsistent with that of the three-phase grounding current of the line CVT, the possibility of the abnormality of the CVT is judged, and timely troubleshooting and processing are needed.
Referring to fig. 1, a schematic structural diagram of an intelligent monitoring device for a metering error state of a CVT provided in an embodiment of the present application is shown. The application provides an intelligent monitoring devices of CVT metering error state specifically includes: the data acquisition device, the data set repeater, the cloud data server and the data receiving processor which are connected in sequence can realize remote data acquisition and collection.
The data acquisition unit is used for acquiring CVT grounding current, processing the CVT grounding current to obtain processed data and sending the processed data to the data repeater. Specifically, in the embodiment of the present application, the CVT ground current collected by the data collector includes an a-phase, a B-phase, and a C-phase ground current.
The data repeater is in communication connection with the data collector and is used for receiving the processed data, packaging the processed data to obtain packaged data, and transmitting the packaged data to the cloud data server.
And the cloud data server operates in a public network environment and is used for storing and forwarding the packed data. Specifically, the data repeater operates in a public network environment, and serves as a small data forwarding service unit to realize a data forwarding service of a non-fixed IP.
The data receiving processor is connected with the cloud data server through a network, and is used for reading the packed data from the cloud data server and carrying out standardized processing on the packed data to obtain data in a standard format; and the data processing device is used for monitoring and analyzing the standard format data in real time to obtain an analysis result, and storing and displaying the standard format data and the analysis result.
Further, the data receiving processor may be directly connected to the data collector through an antenna, and configured to obtain the processed data, and perform standardized processing on the processed data to obtain data in a standard format.
Further, referring to fig. 2, a schematic structural diagram of a data collector provided in the embodiment of the present application is shown. In this embodiment of the application, the data collector includes: the system comprises an open-close type mutual inductor, a signal processing and A/D acquisition module, a first microprocessor and a first 433M wireless module which are sequentially connected.
The open-close type mutual inductor is sleeved on a CVT end screen grounding wire and used for transmitting and transforming CVT grounding current.
The signal processing and A/D acquisition module is used for converting the CVT grounding current into voltage data and carrying out high-precision sampling on the voltage data to obtain sampling data.
The first microprocessor is used for processing the sampling data to obtain processing data.
The first 433M wireless module is configured to send the processed data to a data relay or a data receiving processor.
Further, the sampling frequency of the signal processing and A/D acquisition module is set to be 10 kHz. Specifically, the collection time interval may be set autonomously, and is not limited to a collection frequency of 10KHz, and a sampling interval of 10 seconds to 60 seconds may be set according to specific needs, so as to perform subsequent data processing.
Specifically, the open-close type mutual inductor is sleeved on a ground wire of a CVT (constant-voltage transformer) end bottle and used for transmitting CVT capacitive ground current, data are sent to the microprocessor after being sampled by high-precision A/D (analog/digital), and then the data are sent to the data repeater through the 433M module after being processed (the data repeater can also be directly sent to the data receiving processor under the condition of short distance).
More specifically, the data collector further comprises a power module for providing a power driving source for the data collector. In the embodiment of the application, the power module is directly designed to be a power line, can be directly connected with a power socket and can be powered on, and is simple and convenient. However, in the embodiment of the present application, the power module of the data collector is not limited to the power line, and the data collector may be set as long as the power module can drive the data collector to normally operate.
Further, referring to fig. 3, a schematic structural diagram of a data repeater according to an embodiment of the present application is provided. The data repeater includes: a second 433M wireless module, a second microprocessor, and a 4G wireless module.
And the second 433M wireless module is connected with the data collector through an antenna and is used for receiving the processing data.
And the second micro processor is used for packaging the processing data to obtain packaged data.
The 4G wireless module is used for sending the packed data to the cloud data server.
Specifically, the data repeater is arranged near the data acquisition unit, and is provided with two groups of antennas, wherein one group of antennas is a 433M frequency band and is used for communicating with the data acquisition unit, receiving data, packaging the received data and sending the packaged data to the cloud data server through a 4G wireless network, so that remote data transmission is realized. The data repeater also includes a power module for providing a source of electrical drive for the data repeater. In the embodiment of the application, the power module is directly designed to be a power line, can be directly connected with a power socket and can be powered on, and is simple and convenient. However, the power module of the data repeater in the embodiment of the present application is not limited to the power line, and may be configured to drive the data repeater to normally operate.
Further, referring to fig. 4, a schematic structural diagram of a data receiving processor according to an embodiment of the present application is provided. The data reception processor includes: a third 433M wireless module, an RJ45 ethernet module, a third microprocessor, a storage module, and a display module.
And the third 433M wireless module is connected with the data collector through an antenna and is used for acquiring the processing data.
And the RJ45 Ethernet module is connected with the cloud data server through a network and is used for reading the packaged data.
And the third microprocessor is used for carrying out standardized processing on the processed data or the packed data to obtain data in a standard format, and carrying out real-time monitoring and analysis on the data in the standard format to obtain an analysis result.
The storage module is used for storing the standard format data and the analysis result.
And the display module is used for displaying the standard format data and the analysis result and also used for manually setting parameters.
In an embodiment of the present application, the data receiving processor further includes a power module, configured to provide an electric power driving source for the data receiving processor. In the embodiment of the application, the power module of the data receiving processor is directly designed into the power line, and can be directly connected with the power socket to be powered on, so that the data receiving processor is simple and convenient. However, in the embodiment of the present application, the power module of the data receiving processor is not limited to the power line, and may be configured to drive the data receiving processor to normally operate.
Specifically, when the data receiving processor is normally used, the data receiving processor can be connected with a public network by using a network cable, and can be connected with the data repeater to realize data reading, and the data receiving processor can be used in places with networks.
Further, the standard format data is EXCEL format data, and the EXCEL format data is provided with a time stamp and a real-time clock; the EXCEL format data can be directly output to the mobile hard disk through the storage module, so that comparison with historical statistical data can be realized, and processing and analysis are facilitated.
Furthermore, the display module is a 3.5-inch touch screen, so that data can be displayed friendly, and the parameter setting of workers is facilitated.
Specifically, the data receiving processor can be connected with the data repeater through a network cable to access a public network, so that data reading can be realized, and the data receiving processor can be used in places with networks. If the device is used for field debugging, the device can be switched to work in a 433M receiving mode, and can be directly connected with field acquisition equipment to realize data reading. The read data is stored in mobile storage equipment such as a U disk in an EXCEL format, a real-time clock is provided, the data is provided with time marks, the data can be conveniently processed and analyzed subsequently, and a 3.5-inch touch screen on the equipment can be friendly to display the data and set parameters.
The following describes an intelligent monitoring device for a metering error state of a CVT provided in an embodiment of the present application in detail by using a specific embodiment.
Referring to fig. 5, a schematic diagram of a real-time monitoring data change curve provided in the embodiment of the present application is shown. Based on the foregoing principle, the specific embodiment of the present application intercepts a part of the test wave recording data, the X axis represents a specific time point, the Y axis represents a ground current value, a relationship between current and time can be clearly seen from the graph, and at night, the final bottle current of the CVT increases because of the voltage increase.
A. B, C, if the phase A rises relative to the ground current and the other two phases do not change, it is determined that the phase A is abnormal, and the intelligent monitoring device provided by the embodiment of the application sends out an early warning and a prompt so that the control center can send out a worker to check and check in time.
The application provides an intelligent monitoring devices of CVT metering error state specifically includes: the system comprises a data acquisition unit, a data set relay, a cloud data server and a data receiving processor which are sequentially connected.
The data acquisition unit is used for acquiring CVT grounding current, processing the CVT grounding current to obtain processed data and sending the processed data to the data repeater.
The data repeater is in communication connection with the data collector and is used for receiving the processed data, packaging the processed data to obtain packaged data, and transmitting the packaged data to the cloud data server.
And the cloud data server operates in a public network environment and is used for storing and forwarding the packed data.
The data receiving processor is connected with the cloud data server through a network, and is used for reading the packed data from the cloud data server and carrying out standardized processing on the packed data to obtain data in a standard format; and the data processing device is used for monitoring and analyzing the standard format data in real time to obtain an analysis result, and storing and displaying the standard format data and the analysis result.
Specifically, the logic for monitoring the metering error state of the CVT is as follows: firstly, acquiring bus three-phase CVT grounding current and line three-phase CVT grounding current in the whole transformer substation; and then, the metering error state diagnosis is carried out by comparing the difference between the grounding current of the bus three-phase CVT and the grounding current of the line three-phase CVT. If the grounding currents of the three-phase CVT of the bus and the line are simultaneously increased or decreased, namely the change trends are consistent, judging that the CVT is normal; if the change trend of the three-phase grounding current of the bus CVT is inconsistent with that of the three-phase grounding current of the line CVT, the fact that the CVT is abnormal is judged, and timely troubleshooting and processing are needed.
According to the technical scheme, the intelligent monitoring device for the metering error state of the CVT comprises a data acquisition unit, a data relay, a cloud data server and a data receiving processor which are sequentially connected. According to the ground current monitoring system, the CVT is used for collecting ground current through the data collector with the micro opening, then the collected ground current data of the CVT are subjected to combined processing, analysis and output through the data repeater, the cloud data server, the data receiving processor and the like, and finally real-time dynamic monitoring of the metering error state of the CVT is achieved. The data output by the CVT metering error diagnosis method can be compared with historical statistical data, and therefore accuracy and instantaneity of CVT metering error diagnosis are improved.
The present application has been described in detail with reference to specific embodiments and illustrative examples to enable those skilled in the art to understand or practice the present application, but the description is not intended to limit the present application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (8)
1. An intelligent monitoring device for the metering error state of a CVT (continuously variable transmission), which is characterized by comprising: the system comprises a data acquisition unit, a data set relay, a cloud data server and a data receiving processor which are sequentially connected;
the data acquisition unit is used for acquiring CVT grounding current, processing the CVT grounding current to obtain processed data and sending the processed data to the data repeater;
the data repeater is in communication connection with the data collector and is used for receiving the processed data, packaging the processed data to obtain packaged data and transmitting the packaged data to the cloud data server;
the cloud data server operates in a public network environment and is used for storing and forwarding the packed data;
the data receiving processor is connected with the cloud data server through a network, and is used for reading the packed data from the cloud data server and carrying out standardized processing on the packed data to obtain data in a standard format; and the data processing device is used for monitoring and analyzing the standard format data in real time to obtain an analysis result, and storing and displaying the standard format data and the analysis result.
2. The intelligent monitoring device for the metering error state of the CVT as recited in claim 1, wherein the data receiving processor is directly connected to the data collector through an antenna, and is configured to obtain the processed data and standardize the processed data to obtain data in a standard format.
3. The intelligent monitoring device for the metering error state of the CVT according to claim 2, wherein the data collector comprises: the system comprises an open-close type mutual inductor, a signal processing and A/D acquisition module, a first microprocessor and a first 433M wireless module which are sequentially connected;
the open-close type mutual inductor is sleeved on a CVT end screen grounding wire and used for transmitting and transforming CVT grounding current;
the signal processing and A/D acquisition module is used for converting the CVT grounding current into voltage data and carrying out high-precision sampling on the voltage data to obtain sampling data;
the first microprocessor is used for processing the sampling data to obtain processed data;
the first 433M wireless module is configured to send the processed data to a data relay or a data receiving processor.
4. An intelligent monitoring device for the metering error state of a CVT according to claim 3, characterized in that the sampling frequency of the signal processing and A/D acquisition module is set to 10 kHz.
5. An intelligent CVT metering error status monitoring apparatus as in claim 1, wherein the data relay comprises:
the second 433M wireless module is connected with the data acquisition unit through an antenna and used for receiving the processing data;
the second micro processor is used for packaging the processing data to obtain packaged data;
and the 4G wireless module is used for sending the packed data to the cloud data server.
6. The intelligent CVT metering error status monitoring device of claim 2, wherein the data receiving processor comprises:
the third 433M wireless module is connected with the data collector through an antenna and used for acquiring the processing data;
the RJ45 Ethernet module is connected with the cloud data server through a network and used for reading the packaged data;
the third microprocessor is used for carrying out standardized processing on the processed data or the packed data to obtain standard format data and carrying out real-time monitoring and analysis on the standard format data to obtain an analysis result;
the storage module is used for storing the standard format data and the analysis result;
and the display module is used for displaying the standard format data and the analysis result and also used for manually setting parameters.
7. The intelligent monitoring device for the metering error state of the CVT according to claim 6, characterized in that the standard format data is EXCEL format data, and the EXCEL format data is provided with a time stamp and can be directly output to a mobile hard disk through the storage module.
8. The intelligent monitoring device for the metering error state of the CVT of claim 6, wherein the display module is a 3.5 inch touch screen.
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| CN110196356A (en) * | 2019-05-17 | 2019-09-03 | 国网陕西省电力公司电力科学研究院 | Passive type dielectric spectroscopy on-line measurement analysis system and method |
| CN110689252A (en) * | 2019-09-20 | 2020-01-14 | 云南电网有限责任公司电力科学研究院 | Capacitive voltage transformer metering error situation sensing system |
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