CN111103465A - Real-time state early warning method based on distribution automation master station distribution transformer - Google Patents
Real-time state early warning method based on distribution automation master station distribution transformer Download PDFInfo
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- CN111103465A CN111103465A CN201911370864.1A CN201911370864A CN111103465A CN 111103465 A CN111103465 A CN 111103465A CN 201911370864 A CN201911370864 A CN 201911370864A CN 111103465 A CN111103465 A CN 111103465A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
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Abstract
The invention relates to a distribution transformer real-time state early warning method based on a distribution automation master station, which comprises the steps of collecting quasi real-time data of a distribution transformer in a distribution automation system; analyzing three-phase imbalance and early warning according to real-time data of distribution transformer; carrying out distribution and transformation weight overload analysis and early warning according to real-time data of distribution and transformation; and analyzing and early warning the distribution transformer low voltage according to the real-time data of the distribution transformer. The invention can realize distribution transformer three-phase unbalance early warning, heavy overload early warning and low voltage early warning.
Description
Technical Field
The invention relates to the technical field of power system automation, in particular to a real-time state early warning method based on a distribution automation master station distribution transformer.
Background
The power transmission line network is complicated and complicated, and some environments are particularly severe, which causes great inconvenience to the daily inspection and check work of power workers. With the development and progress of scientific technology, the distribution transformer monitoring and metering terminal is widely applied and acquires a power utilization acquisition system. In order to improve the reliability of the transformer area, a distribution transformer heavy overload risk early warning model is established by means of a power distribution automation system, early warning of heavy overload distribution transformers is achieved, and operation maintenance and fault first-aid repair of a distribution network at the end of the service life are facilitated.
The heavy overload distribution area is automatically analyzed, screened and processed, the capacity of distribution transformer heavy overload on-line analysis and rapid identification is realized, the data asset value of the cross-system is fully mined, and lean data management and comprehensive real-time operation monitoring are realized. Therefore, the supervisory personnel can comprehensively master the real-time running state of the low-voltage power grid, timely discover the power supply state of the transformer area, automatically mine early warning information, know the three-phase load balance degree and the adjustment strategy of the power supply system of the transformer area, and provide scientific basis for energy-saving transformation of the power grid through long-term historical data analysis.
Disclosure of Invention
In view of the above, the present invention provides a distribution transformer real-time state early warning method based on a distribution automation master station, which can realize distribution transformer three-phase imbalance early warning, heavy overload early warning, and low voltage early warning.
The invention is realized by adopting the following scheme: a distribution transformer real-time state early warning method based on a distribution automation master station collects quasi real-time data of distribution transformers in a distribution automation system; analyzing three-phase imbalance and early warning according to real-time data of distribution transformer; carrying out distribution and transformation weight overload analysis and early warning according to real-time data of distribution and transformation; and analyzing and early warning the distribution transformer low voltage according to the real-time data of the distribution transformer.
And further, displaying the early warning information on a human-computer interface.
Further, the collecting of the quasi-real-time data of the distribution transformer in the distribution automation system specifically includes: the distribution automation system communicates with the electricity utilization acquisition system in three areas through webservice, and pushes real-time full-quantity measurement data of the distribution transformer once every ten minutes in an xml file format; and after receiving the data, the three regions send the xml file to the one region through reverse isolation and perform data analysis by the service of the one region.
Further, the analyzing the three-phase imbalance and early warning according to the real-time data of the distribution transformer specifically comprises: and (3) regularly reading the three-phase voltage values of the distribution transformer for comparison: judging the quality code of the three-phase voltage, if the quality code is not initialized, indicating that the three-phase voltage is not collected, and not processing; otherwise, comparing the highest one phase with the lowest one phase in the three-phase voltage values, if the difference value exceeds a preset unbalance amplitude value, marking the state mark as three-phase unbalance, and otherwise, marking as normal; and comparing the current state mark with the state mark at the previous moment, and creating a record if the current state mark is changed from normal to fault. If the fault is changed into normal, updating the end time of the current state record; if the state mark is not changed and the current state mark is three-phase imbalance, calculating the duration of the state mark, and if the duration exceeds the duration alarm limit value, generating three-phase imbalance alarm information.
Further, the analyzing and early warning of the distribution transformer weight overload according to the real-time data of the distribution transformer specifically comprises: and newly establishing an annual list in the historical library, and storing the overload state mark, the state starting time and the state ending time of the distribution transformer. When the distribution transformer analysis service is started, the current overload state mark and the starting time of the current state of the distribution transformer are read from the table. And setting an overload duration alarm limit value through a configuration file. Reading the active power, the capacity and the current information of the distribution transformer at regular time for calculation, if the calculation result meets the preset condition, marking the state mark as overload, otherwise, marking the state mark as normal; and comparing the current state mark with the state mark at the previous moment, and creating a record if the current state mark is changed from normal to fault. If the fault is changed into normal, updating the end time of the current state record; if the state mark is not changed and the current state mark is overloaded, calculating the duration of the state mark, and if the duration exceeds the alarm limit value, generating overload alarm information.
Further, the preset conditions are specifically as follows:
heavy load judgment conditions: active power 1.3-distribution rated capacity > 0;
overload judgment conditions: active power/distribution transformer rated capacity > 1;
the outgoing switch has heavy current-carrying capacity: current/ampacity > 0.7;
the current-carrying capacity of the outgoing line switch is overloaded: the current/ampacity is > 1.
Further, the specific steps of carrying out distribution transformer low-voltage analysis and early warning according to the real-time data of the distribution transformer are as follows: and a new chronology is built in the history library, and the low-voltage state mark, the state starting time and the state ending time of the distribution transformer are saved. When the service is started, the current low voltage state mark of the distribution transformer and the starting time of the current state are read from the table. And the distribution transformer analysis service reads the low voltage duration alarm limit value and the low voltage limit value through the configuration file. Reading three-phase voltage of the distribution transformer at regular time, comparing the three-phase voltage with a low voltage limit value, if the three-phase voltage is lower than the low voltage limit value, marking a state flag as low voltage, and otherwise, marking as normal; and comparing the current state mark with the state mark at the previous moment, and creating a record if the current state mark is changed from normal to fault. If the fault is changed into normal, updating the end time of the current state record; if the overload duration time does not change and the current state is low voltage, calculating overload duration time, and if the overload duration time exceeds the duration time alarm limit value, generating low voltage alarm information.
Preferably, the generated information such as the three-phase unbalance early warning, the heavy overload early warning, the low voltage early warning and the like is pushed to a human-computer, and the early warning information is displayed on a human-computer interface.
Particularly, the invention supports multithread calling and can simultaneously process a plurality of distribution transformer early warning analyses.
Compared with the prior art, the invention has the following beneficial effects: the invention can realize the analysis and early warning of three-phase unbalance, heavy overload and low voltage of the distribution transformer, meet the requirement of service personnel on real-time monitoring and early warning of the running state of the distribution transformer, and ensure the accuracy and timeliness of the analysis and early warning of the three-phase unbalance, heavy overload and low voltage of the distribution transformer.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the embodiment provides a method for early warning a distribution transformer real-time state based on a distribution automation master station, and the method includes acquiring quasi-real-time data of the distribution transformer in a distribution automation system; analyzing three-phase imbalance and early warning according to real-time data of distribution transformer; carrying out distribution and transformation weight overload analysis and early warning according to real-time data of distribution and transformation; and analyzing and early warning the distribution transformer low voltage according to the real-time data of the distribution transformer.
In this embodiment, the warning information is displayed on a human-computer interface.
In this embodiment, the collecting of the quasi-real-time data of the distribution transformer in the distribution automation system specifically includes: the distribution automation system communicates with the electricity utilization acquisition system in three areas through webservice, and pushes real-time full-quantity measurement data of the distribution transformer once every ten minutes in an xml file format; and after receiving the data, the three regions send the xml file to the one region through reverse isolation and perform data analysis by the service of the one region.
In this embodiment, the analyzing three-phase imbalance and early warning according to the real-time data of the distribution transformer specifically includes: and (3) regularly reading the three-phase voltage values of the distribution transformer for comparison: judging the quality code of the three-phase voltage, if the quality code is not initialized, indicating that the three-phase voltage is not collected, and not processing; otherwise, comparing the highest one phase with the lowest one phase in the three-phase voltage values, if the difference value exceeds a preset unbalance amplitude value, marking the state mark as three-phase unbalance, and otherwise, marking as normal; and comparing the current state mark with the state mark at the previous moment, and creating a record if the current state mark is changed from normal to fault. If the fault is changed into normal, updating the end time of the current state record; if the state mark is not changed and the current state mark is three-phase imbalance, calculating the duration of the state mark, and if the duration exceeds the duration alarm limit value, generating three-phase imbalance alarm information.
In this embodiment, the analyzing and early warning of the distribution transformer overload according to the real-time data of the distribution transformer specifically comprises: and newly establishing an annual list in the historical library, and storing the overload state mark, the state starting time and the state ending time of the distribution transformer. When the distribution transformer analysis service is started, the current overload state mark and the starting time of the current state of the distribution transformer are read from the table. And setting an overload duration alarm limit value through a configuration file. Reading the active power, the capacity and the current information of the distribution transformer at regular time for calculation, if the calculation result meets the preset condition, marking the state mark as overload, otherwise, marking the state mark as normal; and comparing the current state mark with the state mark at the previous moment, and creating a record if the current state mark is changed from normal to fault. If the fault is changed into normal, updating the end time of the current state record; if the state mark is not changed and the current state mark is overloaded, calculating the duration of the state mark, and if the duration exceeds the alarm limit value, generating overload alarm information.
In this embodiment, the preset conditions are specifically:
heavy load judgment conditions: active power 1.3-distribution rated capacity > 0;
overload judgment conditions: active power/distribution transformer rated capacity > 1;
the outgoing switch has heavy current-carrying capacity: current/ampacity > 0.7;
the current-carrying capacity of the outgoing line switch is overloaded: the current/ampacity is > 1.
In this embodiment, the analyzing and warning the distribution transformer low voltage according to the real-time data of the distribution transformer specifically comprises: and a new chronology is built in the history library, and the low-voltage state mark, the state starting time and the state ending time of the distribution transformer are saved. When the service is started, the current low voltage state mark of the distribution transformer and the starting time of the current state are read from the table. And the distribution transformer analysis service reads the low voltage duration alarm limit value and the low voltage limit value through the configuration file. Reading three-phase voltage of the distribution transformer at regular time, comparing the three-phase voltage with a low voltage limit value, if the three-phase voltage is lower than the low voltage limit value, marking a state flag as low voltage, and otherwise, marking as normal; and comparing the current state mark with the state mark at the previous moment, and creating a record if the current state mark is changed from normal to fault. If the fault is changed into normal, updating the end time of the current state record; if the overload duration time does not change and the current state is low voltage, calculating overload duration time, and if the overload duration time exceeds the duration time alarm limit value, generating low voltage alarm information.
Preferably, the generated information such as the three-phase unbalance early warning, the heavy overload early warning, the low voltage early warning and the like is pushed to a human-computer, and the early warning information is displayed on a human-computer interface.
In particular, the embodiment supports multi-thread calling, and can simultaneously process a plurality of distribution transformer early warning analyses.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (7)
1. A distribution transformer real-time state early warning method based on a distribution automation master station is characterized in that a distribution automation system collects quasi real-time data of a distribution transformer; analyzing three-phase imbalance and early warning according to real-time data of distribution transformer; carrying out distribution and transformation weight overload analysis and early warning according to real-time data of distribution and transformation; and analyzing and early warning the distribution transformer low voltage according to the real-time data of the distribution transformer.
2. The method for power distribution automation master station and distribution transformer real-time state early warning based on claim 1 is characterized in that early warning information is displayed on a human-computer interface.
3. The method for power distribution automation master station and distribution transformer real-time state early warning based on claim 1 is characterized in that the method for collecting the quasi-real-time data of the distribution transformer in the power distribution automation system specifically comprises the following steps: the distribution automation system communicates with the electricity utilization acquisition system in three areas through webservice, and pushes real-time full-quantity measurement data of the distribution transformer once every ten minutes in an xml file format; and after receiving the data, the three regions send the xml file to the one region through reverse isolation and perform data analysis by the service of the one region.
4. The method for early warning of the real-time state of the distribution transformer of the distribution automation main station according to claim 1, wherein the analyzing of the three-phase imbalance and the early warning according to the real-time data of the distribution transformer are specifically as follows: and (3) regularly reading the three-phase voltage values of the distribution transformer for comparison: judging the quality code of the three-phase voltage, if the quality code is not initialized, indicating that the three-phase voltage is not collected, and not processing; otherwise, comparing the highest one phase with the lowest one phase in the three-phase voltage values, if the difference value exceeds a preset unbalance amplitude value, marking the state mark as three-phase unbalance, and otherwise, marking as normal; and comparing the current state mark with the state mark at the previous moment, if the state mark is not changed and the current state mark is three-phase imbalance, calculating the duration of the state mark, and if the duration exceeds a duration alarm limit value, generating three-phase imbalance alarm information.
5. The method for performing distribution transformer real-time state early warning based on the distribution automation master station according to claim 1, wherein the analysis and early warning of distribution transformer weight overload according to the real-time data of the distribution transformer specifically comprises: reading the active power, the capacity and the current information of the distribution transformer at regular time for calculation, if the calculation result meets the preset condition, marking the state mark as overload, otherwise, marking the state mark as normal; and comparing the current state mark with the state mark at the last moment, if the state mark is not changed and the current state mark is overloaded, calculating the duration of the state mark, and if the current state mark exceeds the duration alarm limit value, generating overload alarm information.
6. The method for power distribution automation master station and distribution transformation real-time state early warning based on claim 5 is characterized in that the preset conditions are specifically as follows:
heavy load judgment conditions: active power 1.3-distribution rated capacity > 0;
overload judgment conditions: active power/distribution transformer rated capacity > 1;
the outgoing switch has heavy current-carrying capacity: current/ampacity > 0.7;
the current-carrying capacity of the outgoing line switch is overloaded: the current/ampacity is > 1.
7. The method for performing distribution transformer real-time state early warning based on the distribution automation master station as claimed in claim 1, wherein the analysis and early warning of the distribution transformer low voltage according to the real-time data of the distribution transformer specifically comprises: reading three-phase voltage of the distribution transformer at regular time, comparing the three-phase voltage with a low voltage limit value, if the three-phase voltage is lower than the low voltage limit value, marking a state flag as low voltage, and otherwise, marking as normal; and comparing the current state mark with the state mark at the last moment, if the current state mark is not changed and the current state mark is low voltage, calculating overload duration, and if the overload duration exceeds a duration alarm limit value, generating low voltage alarm information.
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