CN114924160A - Low-voltage transformer area line loss analysis device and method - Google Patents
Low-voltage transformer area line loss analysis device and method Download PDFInfo
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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- G01R22/08—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using analogue techniques
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention discloses a low-voltage transformer area line loss analysis device and method, and relates to the technical field of line loss management; the device comprises a current transformer, an analog-to-digital conversion unit, a controller, a first communication device and a line loss analysis module which are electrically connected in sequence, the method comprises a line loss analysis step, the controller obtains current waveforms and current I of a transformer area terminal box side sent by the current transformer, obtains voltage waveforms and voltage U of a management terminal side, and further obtains an angle difference between the two waveforms
And power factor
Obtaining a loss value P of a transformer area, obtaining a user loss value P2 at a management terminal side, subtracting the user loss value P2 from the loss value P to obtain a line loss value P3, and comparing the line loss value P3 with an electricity stealing threshold value P4 by a controller to obtain the risk of electricity stealing or the situation of electricity stealing; the line loss analysis device has the advantages that the line loss analysis working efficiency is high and the effect is good through the current transformer, the analog-to-digital conversion unit, the controller, the first communication device, the line loss analysis module and the like.
Description
Technical Field
The invention relates to the technical field of line loss management, in particular to a low-voltage transformer area line loss analysis device and method.
Background
In the transmission process of electric energy, certain loss inevitably occurs, commonly called technical line loss, and in addition, some artificial management factors also cause electric energy loss, commonly called management line loss.
The lean management level of the line loss of the low-voltage transformer area is enhanced, and the method mainly starts from the aspects of making daily information data monitoring management, timely completing system basic information maintenance for newly added customers, monitoring the line loss change condition every day, carrying out daily analysis on transformer areas with unqualified line loss and the like. Particularly, important verification is carried out on zero-degree households, electric quantity abnormal households, users who fail to collect electricity by the electricity collection system, users who require on-site meter reading and the like, so that the short line loss management boards in the transformer area are practically eliminated, and the line loss management level is continuously improved.
The authorized notice number is CN 104809658B, and the name is a rapid analysis method for the line loss of a low-voltage distribution network area. The practicability of the line loss analysis index of the low-voltage distribution network platform area is improved, the contribution rate of the line loss primary index to the line loss is mainly analyzed, the multiple co-linearity problem of the line loss primary index is solved, the line loss secondary index with high line loss contribution rate is screened out, and the workload of line loss analysis is greatly reduced.
The name of the authorized notice number is CN 106291252B, and the method is a management and analysis method for the line loss of a 10kV line loss and a low-voltage transformer area. Establishing a distribution network line loss standardized management mode, and establishing a line loss management system for multiple specialties including planning, construction transformation, production technology, scheduling operation, electric power marketing and electric energy metering; the method has the advantages that each link of the line loss work is combed through the system, the internal relation of each work is cleared, the work key point of the line loss management is mastered, the punctiform line loss management mode is formed to replace the past flaky and planar management modes, the integrated line loss management mode is led through clear division and tacit cooperation, the line loss rate of the power supply enterprise is gradually reduced, the electric energy consumption in the power supply and distribution process is reduced, and the economic added value of the power supply enterprise is improved; a standardized line loss management application system is established, and auxiliary decision support is provided for user fault repair location, high-load distribution transformer reconstruction and transformer area load distribution work, so that the phenomenon of equipment damage caused by untimely fault repair and long-term overload is effectively reduced, and the economic loss value of a power supply enterprise is remarkably reduced.
With the two patent documents and the prior art, the inventor analyzes and discovers that, in the prior art, the line loss analysis device in the low-voltage transformer area not only needs to collect current, but also needs to collect voltage, and when collecting voltage, the terminal needs to be detached, which may cause a short circuit of the voltage transformer PT, and further cause serious accidents. Meanwhile, the existing electricity stealing threshold is invariable and cannot be changed along with the increase of the electricity consumption of the user, so that the situation of misjudgment of electricity stealing can be caused.
Problems with the prior art and considerations:
how to solve in the line loss analysis work because need unpack apart the terminal acquisition current and the voltage of platform district terminal box, it is fixed to steal the electric threshold value, leads to line loss analysis work efficiency lower, the relatively poor technical problem of effect.
Disclosure of Invention
The invention aims to provide a low-voltage transformer area line loss analysis device and method, and solve the technical problem of low line loss analysis work efficiency.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the line loss analysis device for the low-voltage transformer area comprises a current transformer, an analog-to-digital conversion unit, a controller, a first communication device and a line loss analysis module which are electrically connected in sequence, wherein the line loss analysis module is a program module and used for obtaining current waveforms and current I of a transformer area terminal box side sent by the current transformer, the controller obtains voltage waveforms and voltage U of a management terminal side through the first communication device, the controller obtains the voltage waveforms of the transformer area terminal box side and the voltage waveforms of the management terminal side according to the current waveforms of the transformer area terminal box side, and then angle difference between the two waveforms can be obtained
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists.
The further technical scheme is as follows: the current transformer is used for being placed on a terminal box of a platform area to obtain a platform area current signal or being moved away, the first communication device is a wireless communication device, and the current transformer, the analog-to-digital conversion unit, the controller and the first communication device form a mobile line loss analysis device; the line loss analysis module is also used for acquiring that the electricity stealing risk exists and improving the monitoring frequency when the electricity stealing threshold P4 is greater than 1% P2 when the electricity consumption of the user is less than a certain threshold, and acquiring that the electricity stealing situation exists and sending the electricity stealing risk or the electricity stealing situation to the outside when the electricity stealing threshold P4 is greater than 2% P2; before the electricity stealing threshold value P4 is determined, one hour is taken as a parting line, the loss value P2 of the user is subjected to clustering analysis based on a K-means clustering algorithm, and the threshold value within one hour is obtained and is taken as the electricity stealing threshold value P4.
The further technical scheme is as follows: the intelligent power supply system further comprises a management terminal and a second communication device, wherein the management terminal is connected with the second communication device and is in communication with the second communication device, the first communication device is connected with the second communication device and is in communication with the second communication device, and the management terminal is a computer used for obtaining voltage information U of a user and current information of the user through an intelligent ammeter and obtaining a user loss value P2; and the line loss analysis module is also used for the management terminal to obtain the voltage information U of the user and the current information of the user sent by the intelligent electric meter, and calculating to obtain a user loss value P2.
The further technical scheme is as follows: the current transformer is a Hall sensor, and the controller is a single chip microcomputer.
The low-voltage transformer area line loss analysis device comprises the line loss analysis module, the line loss analysis module is a program module and used for obtaining current waveforms and current I of a transformer area terminal box side sent by a current transformer through a controller, the controller obtains voltage waveforms and voltage U of a management terminal side through a first communication device, and the controller can obtain an angle difference between the two waveforms according to the current waveforms of the transformer area terminal box side and the voltage waveforms of the management terminal side and further obtain an angle difference between the two waveforms
And power factor
Will manage the terminal sideVoltage information U, current information I on the side of the station block terminal box, and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists.
Based on the device, the line loss analysis step comprises the following steps that the controller obtains a current waveform and a current I of a transformer area terminal box side sent by a current transformer, the controller obtains a voltage waveform and a voltage U of a management terminal side through a first communication device, and the controller obtains an angle difference according to the current waveform of the transformer area terminal box side and the voltage waveform of the management terminal side and further obtains the angle difference between the two waveforms
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists.
The further technical scheme is as follows: in the line loss analysis step, when the electricity stealing threshold P4 is greater than 1% P2, the controller knows that the electricity stealing risk exists and improves the monitoring frequency, and when the electricity stealing threshold P4 is greater than 2% P2, the controller knows that the electricity stealing situation exists and sends the electricity stealing risk or the electricity stealing situation to the outside; before the electricity stealing threshold P4 is determined, clustering analysis is carried out on the loss value P2 of the user based on a K-means clustering algorithm by taking one hour as a dividing line, and the threshold within one hour is obtained as the electricity stealing threshold P4.
The further technical scheme is as follows: the electricity stealing threshold P4 is not constant, the P2 is increased by one percent, the P4 is increased by one thousandth, and the formula shows that when the normal threshold is that the P4 is larger than 1% of P2, the electricity stealing risk is determined, and when the normal threshold is larger than 2% of P2, the electricity stealing situation is determined. Wherein the P2 is increased by one percent, the first threshold of P4 is 1.1% P2, and the second threshold is 2.1% P2.
The further technical scheme is as follows: when the line loss is abnormal, the judgment condition between different hours and the line loss threshold value and the analysis between the line loss threshold values of the same hour in the next few days can further improve the precision of the judgment on the line loss abnormality.
The further technical scheme is as follows: in the line loss analysis step, the management terminal obtains the voltage information U of the user and the current information of the user sent by the intelligent electric meter, and calculates and obtains a user loss value P2.
The line loss analysis device for the low-voltage transformer area comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the computer program comprises the line loss analysis module, and the processor executes the computer program to realize the corresponding steps of the method.
The low-voltage transformer area line loss analysis device comprises a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, the computer program comprises the line loss analysis module, and when being executed by a processor, the computer program realizes the corresponding steps in the method.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the low-voltage transformer area line loss analysis device comprises a current transformer, an analog-to-digital conversion unit, a controller, a first communication device and a line loss analysis module which are sequentially and electrically connected, wherein the line loss analysis module is a program module and used for the controller to obtain a transformer area sent by the current transformerThe controller obtains voltage information U of the management terminal side through the first communication device, and obtains an angle difference according to the current information I of the transformer area terminal box side and the voltage information U of the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists. According to the technical scheme, the line loss analysis work efficiency is high and the effect is good through the current transformer, the analog-to-digital conversion unit, the controller, the first communication device, the line loss analysis module and the like.
The safety effect of the PT equipment can be further improved by adopting the transformer area line loss analysis device which is set to collect current only and not collect voltage, and meanwhile, in order to further improve the accuracy of line loss, the PT equipment is communicated with a dispatching center by arranging a communication device, so that the waveform of the voltage at the moment is determined, and the calculation accuracy of the transformer area line loss is further determined. Meanwhile, the K-means algorithm is adopted to perform cluster analysis on the specific conditions of the electric equipment in each hour in one day, so that more accurate reference is provided for setting the electricity stealing threshold. In addition, when line loss abnormity exists, the accurate time of electricity stealing occurrence is determined by analyzing the same hours on different dates or the same hour on the same date when the line loss abnormity exists, the accuracy of judging the line loss abnormity can be further improved, meanwhile, the sampling frequency is accelerated, the line loss value can be recorded and uploaded more quickly, the first time of the occurrence of the line loss abnormity can be recorded on the case, and a solid foundation is improved for later-stage maintenance. The mobile arrangement also facilitates the monitoring of the line loss. Through setting up the size of the threshold value of alarm value and definite electricity stealing risk value, can further improve the monitoring precision of line loss, can also just arouse dispatch personnel's attention and warning at the very first time that has the risk of stealing electricity simultaneously, the setting of developments electricity stealing threshold value also makes the judgement of whole electricity stealing become more accurate.
The line loss analysis method for the low-voltage transformer area comprises the line loss analysis step, wherein a controller obtains current information I sent by a current transformer on the transformer area terminal box side, the controller obtains voltage information U on the management terminal side through a first communication device, and the controller obtains an angle difference according to the current information I on the transformer area terminal box side and the voltage information U on the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists. This technical scheme, it realizes that line loss analysis work efficiency is higher, the effect is better through line loss analysis step etc..
See detailed description of the preferred embodiments.
Drawings
FIG. 1 is a schematic block diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic block diagram of embodiment 2 of the present invention;
FIG. 3 is a schematic block diagram of embodiment 3 of the present invention;
FIG. 4 is a schematic block diagram of embodiment 6 of the present invention;
FIG. 5 is a schematic block diagram of embodiment 8 of the present invention;
FIG. 6 is a screen shot of the monitoring effect of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. 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 the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be appreciated by those skilled in the art that the present application may be practiced without departing from the spirit and scope of the present application, and that the present application is not limited to the specific embodiments disclosed below.
Example 1:
as shown in fig. 1, the invention discloses a low-voltage transformer area line loss analysis device, which comprises a current transformer, an analog-to-digital conversion unit, a controller, a first communication device and a line loss analysis module, wherein the current transformer, the analog-to-digital conversion unit, the controller, the first communication device and the line loss analysis module are sequentially and electrically connected, the current transformer is a hall sensor, the current transformer is placed on a terminal box of a transformer area to obtain a transformer area current signal or is moved away, the controller is a single chip microcomputer, the first communication device is a wireless communication device, and the current transformer, the analog-to-digital conversion unit, the controller and the first communication device form a mobile line loss analysis device.
The line loss analysis module is a program module and is used for acquiring current information I of the transformer area terminal box side sent by the current transformer through the controller, and the controller acquires the tube through the first communication deviceVoltage information U of management terminal side, the controller obtains angle difference according to current information I of transformer area terminal box side and voltage information U of management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 of the management terminal side through the first communication device, the loss value P of the transformer area is subtracted by a user loss value P2 of the management terminal side to obtain a line loss value P3, the controller compares the line loss value P3 with a power stealing threshold value P4 to know that power stealing risks or power stealing situations exist, namely when the power stealing threshold value P4 is larger than 1% of P2, the controller knows that the power stealing risks exist, when the power stealing threshold value P4 is larger than 2% of P2, the controller knows that the power stealing situations exist, and the controller sends the power stealing risks or the power stealing situations to the outside.
The current transformer, the analog-to-digital conversion unit, the controller, the first communication device and the corresponding communication connection technology are not described herein again for the prior art.
Example 1 description of use:
the manager places the line loss analysis device on the terminal box of the platform area during inspection, the first communication device of the line loss analysis device is wirelessly connected with the second communication device of the control room, the second communication device is in wired connection and communication with the server of the control room, and the server is a management terminal.
Example 1 working procedure:
a current transformer of the line loss analysis device obtains current information I of a transformer area terminal box side and sends the current information I to a controller of the line loss analysis device, the controller obtains the current information I of the transformer area terminal box side sent by the current transformer, the controller reads and obtains voltage information U of a management terminal side through a first communication device, and the controller obtains the voltage information U of the management terminal side according to the transformer area terminal sideObtaining the angle difference between the current information I of the subbox side and the voltage information U of the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
Multiplying to obtain a loss value P of a transformer area, obtaining a user loss value P2 of a management terminal side by a controller through a first communication device, subtracting the user loss value P2 of the management terminal side from the loss value P of the transformer area to obtain a line loss value P3, comparing the line loss value P3 with a power stealing threshold value P4 by the controller to know that the power stealing risk or the power stealing situation exists, namely when the power stealing threshold value P4 is larger than 1% P2, knowing that the power stealing risk exists by the controller, when the power stealing threshold value P4 is larger than 2% P2, knowing that the power stealing situation exists by the controller, sending the power stealing risk or the power stealing situation to the outside by the controller, and obtaining the power stealing risk or the power stealing situation sent by the controller and correspondingly alarming by a server; before the electricity stealing threshold P4 is determined, the management terminal takes one hour as a parting line, carries out cluster analysis on the loss value P2 of the user based on a K-means clustering algorithm, and obtains the threshold within one hour as the electricity stealing threshold P4.
Example 2:
As shown in fig. 2, the invention discloses a low-voltage transformer area line loss analysis device, which comprises a current transformer, an analog-to-digital conversion unit, a controller, a first communication device, a line loss analysis module, a management terminal and a second communication device, wherein the current transformer, the analog-to-digital conversion unit, the controller, the first communication device and the first communication device are sequentially and electrically connected, the current transformer is a hall sensor, the current transformer is placed on a terminal box of a transformer area to obtain a transformer area current signal or is moved away, the controller is a single chip microcomputer, the first communication device is a wireless communication device, and the current transformer, the analog-to-digital conversion unit, the controller and the first communication device form a mobile line loss analysis device.
The management terminal is a server of a management and control room, the management terminal is in wired connection and communication with the second communication device, the first communication device is in wireless connection and communication with the second communication device, and the management terminal is used for being connected with the intelligent electric meter, obtaining voltage information U of a user and current information of the user and obtaining a user loss value P2.
The line loss analysis module is a program module and is used for obtaining voltage information U of a user and current information of the user sent by the intelligent electric meter through the management terminal and calculating to obtain a user loss value P2; before the electricity stealing threshold value P4 is determined, the management terminal takes one hour as a parting line, and carries out clustering analysis on the loss value P2 of the user based on a K-means clustering algorithm to obtain the threshold value within one hour as an electricity stealing threshold value P4; the controller obtains current information I of the transformer area terminal box side sent by the current transformer, obtains voltage information U of the management terminal side through the first communication device, and obtains an angle difference according to the current information I of the transformer area terminal box side and the voltage information U of the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
Multiplying to obtain a loss value P of a transformer area, obtaining a user loss value P2 of a management terminal side by a controller through a first communication device, subtracting the user loss value P2 of the management terminal side from the loss value P of the transformer area to obtain a line loss value P3, comparing the line loss value P3 with a power stealing threshold value P4 by the controller to know that power stealing risks or power stealing situations exist, namely when the power stealing threshold value P4 is larger than 1% of P2, knowing that the power stealing risks exist, when the power stealing threshold value P4 is larger than 2% of P2, knowing that the power stealing situations exist, sending the power stealing risks or power stealing situations to the management terminal by the controller, and managing the powerThe terminal obtains the electricity stealing risk or the electricity stealing situation and gives an alarm correspondingly.
The current transformer, the analog-to-digital conversion unit, the controller, the first communication device, the smart meter, the management terminal, the second communication device and corresponding communication connection technologies are not described herein again for the prior art.
Example 3:
as shown in fig. 3, the present invention discloses a low-voltage transformer area line loss analysis apparatus, which includes the line loss analysis module in embodiment 1, wherein the line loss analysis module is a program module, and is used for a controller to obtain current information I of a transformer area terminal box side sent by a current transformer, the controller obtains voltage information U of a management terminal side through a first communication device, and the controller obtains an angle difference according to the current information I of the transformer area terminal box side and the voltage information U of the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists.
Example 4:
the invention discloses a low-voltage transformer area line loss analysis method, which is based on an embodiment 1 and comprises the following steps:
a line loss analysis step, wherein the controller obtains current information I of the transformer area terminal box side sent by the current transformer, obtains voltage information U of the management terminal side through the first communication device, and obtains the current information I of the transformer area terminal box side and the voltage information U of the management terminal side according to the controllerObtaining the angle difference of the information U
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 of the management terminal side through the first communication device, the loss value P of the transformer area is subtracted by a user loss value P2 of the management terminal side to obtain a line loss value P3, the controller compares the line loss value P3 with a power stealing threshold value P4 to know that power stealing risks or power stealing situations exist, namely when the power stealing threshold value P4 is larger than 1% of P2, the controller knows that the power stealing risks exist, when the power stealing threshold value P4 is larger than 2% of P2, the controller knows that the power stealing situations exist, and the controller sends the power stealing risks or the power stealing situations to the outside.
Example 5:
the invention discloses a low-voltage transformer area line loss analysis method, which is based on an embodiment 2 and comprises the following steps:
a line loss analysis step, namely acquiring voltage information U of a user and current information of the user sent by the intelligent electric meter through the management terminal, and calculating to obtain a user loss value P2; before the electricity stealing threshold P4 is determined, the management terminal takes one hour as a parting line, and carries out cluster analysis on the loss value P2 of the user based on a K-means clustering algorithm to obtain a threshold within one hour as an electricity stealing threshold P4; the controller obtains current information I of the transformer area terminal box side sent by the current transformer, obtains voltage information U of the management terminal side through the first communication device, and obtains an angle difference according to the current information I of the transformer area terminal box side and the voltage information U of the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 of the management terminal side through the first communication device, the loss value P of the transformer area subtracts the user loss value P2 of the management terminal side to obtain a line loss value P3, the controller compares the line loss value P3 with a power stealing threshold value P4 to know that the power stealing risk or the power stealing situation exists, namely when the power stealing threshold value P4 is larger than 1% of P2, the controller knows that the power stealing risk exists, when the power stealing threshold value P4 is larger than 2% of P2, the controller knows that the power stealing situation exists, the controller sends the power stealing risk or the power stealing situation to the management terminal, and the management terminal obtains the power stealing risk or the power stealing situation and gives an alarm correspondingly.
Example 6:
as shown in fig. 4, the present invention discloses a low-voltage transformer area line loss analysis apparatus, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of embodiment 4 when executing the computer program.
Example 7:
the invention discloses a low-voltage transformer area line loss analysis device which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the steps of embodiment 5 are realized when the processor executes the computer program.
Example 8:
as shown in fig. 5, the present invention discloses a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps in embodiment 4.
Example 9:
a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps in embodiment 5 is disclosed.
The conception of the application is as follows:
under the premise of not collecting the voltage at the terminal box, the current collection is realized through the Hall sensor, so that the collection of the loss signal can be realized on the basis of not changing the existing wiring of the terminal box. The voltage adopts the voltage information stored in the management server, the voltage information is acquired by the intelligent electric meter and sent to the management server, and the voltage information sent to the server by the intelligent electric meter can be adopted because the voltage is invariable in line loss, so that the voltage information does not need to be obtained by accessing a voltage sensor at a terminal box.
The voltage and power factor of the low-voltage transformer area are not always constant and can change along with the change of the load of a family, so that severe change occurs, and how to ensure the reliability and accuracy of the line loss analysis device and further ensure the safety of the voltage transformer PT device is urgently needed to be improved. The power stealing threshold of the present application is dynamically set, unlike other prior art.
Description of the technical scheme:
1. firstly, the current signals of the existing distribution room are collected through devices such as a Hall sensor on the basis of not damaging the terminal wiring of a terminal box.
The acquisition of the current signal not only needs to acquire the effective value of the current, but also acquires the current waveform through a mobile line loss analysis device under the sampling frequency of more than 14kHz through high-frequency acquisition.
2. On the basis that the communication device is arranged in the mobile line loss analysis device, the communication device and a remote dispatching and control center are used for transmitting voltage signals in real time, and the voltage waveforms and the current waveforms are analyzed in real time, so that phase angle values and power factor values are obtained, and real-time power consumption values can be obtained.
3. And comparing the obtained power consumption value P with a real-time power consumption value P2 of a remote dispatching center to obtain a line loss value P3 at the moment, so as to determine whether electricity stealing exists or not.
4. The method comprises the steps that the line loss value and the electricity stealing threshold value are judged, so that the electricity stealing situation is judged, the electricity stealing threshold value is not invariable and can be changed along with the change of the power loss value of the whole network, and on the basis that the power loss value of the whole network is improved by 1 percent, the whole electricity stealing threshold value can be correspondingly changed along with an analysis system of the whole mobile electricity stealing analysis device.
Firstly, before the threshold is determined, 1h is taken as a parting line, and the power use condition and the power factor condition of the whole distribution area are clustered by adopting a K-means clustering algorithm, so that the electricity load condition of the whole distribution area in each hour after thinning is obtained.
And secondly, obtaining the power load condition of the whole distribution area through the clustering analysis, so as to further adjust the electricity stealing threshold value, wherein the amplitude of the electricity stealing threshold value along with the rise of the power loss value is different according to different load conditions of the whole distribution area.
And simultaneously, the ratio of the line loss to the power loss value at the moment is utilized to alarm the gradient line loss risk, when the ratio is about 1% -2%, the alarm is carried out and data is uploaded to a dispatching center, and when the ratio is more than 2%, the electricity stealing risk is determined.
5. When the risk of electricity stealing exists, the mobile line loss analysis device can further adjust the monitoring frequency, improve the monitoring speed, further reduce the electricity stealing threshold value, store the electricity stealing threshold value in the memory, and determine whether the electricity stealing phenomenon exists or not through the analysis of data above 1h and the comparative analysis of data between adjacent working days.
6. When the condition of electricity stealing is judged, the condition is transmitted to remote dispatching and operating personnel through the communication device of the mobile line loss analysis device, so that the monitoring strength and the monitoring precision of the line loss of the distribution room are further enhanced.
The method comprises the following specific implementation steps:
1. current I and current waveform collection from low voltage side terminal box of community distribution transformer
2. Obtaining voltage U and voltage waveform from server of dispatching center through communication device
3. Determining the angular difference by means of the voltage and current waveforms
And power factor
4. Calculating loss value of cell
5. Obtaining user loss value P2 from dispatching center
6. Determining line loss value P3 ═ P-P2
7. And comparing with a power stealing threshold P4 to determine whether a power stealing risk or a power stealing situation exists.
The electricity stealing threshold P4 is not constant, the P2 is increased by one percent, the P4 is increased by one thousandth, and the formula shows that when the normal threshold is that the P4 is larger than 1% of P2, the electricity stealing risk is determined, and when the normal threshold is larger than 2% of P2, the electricity stealing situation is determined. Wherein P2 is increased by one percent, the first threshold of P4 is 1.1% P2 and the second threshold is 2.1% P2.
Firstly, before the threshold is determined, 1h is taken as a parting line, and the loss value P2 of the user is subjected to clustering analysis by adopting a K-means clustering algorithm, so that the threshold within one hour is determined.
8. When the risk of electricity stealing exists, the mobile line loss analysis device can further adjust the monitoring frequency, improve the monitoring speed and store the monitoring frequency into the memory, and through the analysis of data above 1h and the comparative analysis of data between adjacent working days, whether the electricity stealing phenomenon exists is determined.
9. As shown in fig. 6, when it is determined that an electricity stealing situation occurs, the electricity stealing situation is transmitted to a remote dispatching and operating person through the communication device of the mobile line loss analysis device, so that the monitoring strength and the monitoring precision of the line loss of the distribution room are further enhanced.
After the application runs secretly for a period of time, the feedback of field technicians has the advantages that:
the safety effect of the PT equipment can be further improved by adopting the transformer area line loss analysis device which is set to collect current only and not collect voltage, and meanwhile, in order to further improve the accuracy of line loss, the PT equipment is communicated with a dispatching center by arranging a communication device, so that the waveform of the voltage at the moment is determined, and the calculation accuracy of the transformer area line loss is further determined. Meanwhile, the K-means algorithm is adopted to perform cluster analysis on the specific conditions of the electric equipment in each hour in one day, so that more accurate reference is provided for setting the electricity stealing threshold. In addition, when line loss abnormity exists, the judgment precision of the line loss abnormity can be further improved through the judgment condition between different hours and the line loss threshold value and the analysis between the line loss threshold values of the same hour in the same days, meanwhile, the sampling frequency is accelerated, and the line loss value can be recorded and uploaded more quickly, so that the line loss abnormity can be recorded on the case at the first moment of occurrence of the line loss abnormity, and a solid foundation is improved for later-stage maintenance right. The mobile arrangement also facilitates the monitoring of the line loss. By setting the alarm value and determining the threshold value of the electricity stealing risk value, the line loss monitoring precision can be further improved, and meanwhile, the attention and the warning of a dispatcher can be brought at the first time when the electricity stealing risk exists.
At present, the technical scheme of the invention has been subjected to a pilot plant test, namely a small-scale test of the product before large-scale mass production; after the pilot test is finished, the investigation for the use of the user is carried out in a small range, and the investigation result shows that the satisfaction degree of the user is higher; the preparation of products for formal production for industrialization (including intellectual property risk early warning research) has been started.
Claims (10)
1. The utility model provides a low pressure platform district line loss analytical equipment which characterized in that: the line loss analysis module is a program module and is used for obtaining current waveforms and current I of a transformer area terminal box side sent by the current transformer by the controller, and the controllerThe first communication device obtains the voltage waveform and voltage U of the management terminal side, and the controller obtains the angle difference between the two waveforms according to the current waveform and current I of the station terminal box side and the voltage waveform and voltage U of the management terminal side
And power factor
Will manage the voltage U at the terminal side, the current I at the terminal box side of the transformer area and the power factor
The controller obtains a loss value P of the transformer area by multiplication, obtains a user loss value P2 on the management terminal side through the first communication device, subtracts the user loss value P2 on the management terminal side from the loss value P of the transformer area to obtain a line loss value P3, and compares the line loss value P3 with a power stealing threshold value P4 to know that the power stealing risk or the power stealing situation exists.
2. The low-voltage transformer area line loss analysis device according to claim 1, wherein: the current transformer is used for being placed on a terminal box of the transformer area to obtain a transformer area current signal or being moved away, the first communication device is a wireless communication device, and the current transformer, the analog-to-digital conversion unit, the controller and the first communication device form a mobile line loss analysis device; the line loss analysis module is further used for acquiring that the electricity stealing risk exists and improving the monitoring frequency when the user loss value P2 is smaller than a certain threshold value and the electricity stealing threshold value P4 is larger than 1% of the user loss value P2, and acquiring that the electricity stealing situation exists and sending the electricity stealing risk or the electricity stealing situation to the outside when the electricity stealing threshold value P4 is larger than 2% of the user loss value P2; before the electricity stealing threshold P4 is determined, clustering analysis is carried out on the loss value P2 of the user based on a K-means clustering algorithm by taking one hour as a dividing line, and the threshold within one hour is obtained as the electricity stealing threshold P4.
3. The low-voltage transformer area line loss analysis device according to claim 1, wherein: the current transformer is a Hall sensor, and the controller is a singlechip; when the user loss value P2 is increased by one percent, the electricity stealing threshold value P4 is increased by one thousandth, and the normal threshold value is expressed by a formula, when the electricity stealing threshold value P4 is larger than 1% of the user loss value P2, the electricity stealing risk is determined to exist, and when the electricity stealing risk is larger than 2% of the user loss value P2, the electricity stealing situation is determined to exist; if the user loss value P2 is increased by one percent, the first threshold of the electricity stealing threshold P4 is 1.1% user loss value P2, and the second threshold is 2.1% user loss value P2.
4. The low-voltage transformer area line loss analysis device according to claim 1, wherein: the intelligent power supply system further comprises a management terminal and a second communication device, wherein the management terminal is connected with the second communication device and is in communication with the second communication device, the first communication device is connected with the second communication device and is in communication with the second communication device, and the management terminal is a computer which is used for obtaining voltage information U of a user and current information of the user through an intelligent ammeter and obtaining a user loss value P2; and the line loss analysis module is also used for the management terminal to obtain the user voltage information U and the user current information sent by the intelligent electric meter, and calculate to obtain a user loss value P2.
5. The utility model provides a low pressure platform district line loss analytical equipment which characterized in that: the line loss analyzing device of claim 1, wherein the line loss analyzing device is a program module for acquiring the current information I from the current transformer on the transformer substation terminal box side, acquiring the voltage information U from the management terminal side by the controller through the first communication device, and acquiring the angle difference by the controller according to the current information I from the transformer substation terminal box side and the voltage information U from the management terminal side
And power factor
To manage voltage information U of terminal side, of station terminal box sideCurrent information I and power factor
The controller obtains a loss value P of the transformer area by multiplication, obtains a user loss value P2 on the management terminal side through the first communication device, subtracts the user loss value P2 on the management terminal side from the loss value P of the transformer area to obtain a line loss value P3, and compares the line loss value P3 with a power stealing threshold value P4 to know that the power stealing risk or the power stealing situation exists.
6. A low-voltage transformer area line loss analysis method is characterized by comprising the following steps: the apparatus according to claim 1, comprising a line loss analyzing step of obtaining a current waveform and a current I of the station terminal box side from the current transformer by the controller, obtaining a voltage waveform and a voltage U of the management terminal side by the controller through the first communication means, and obtaining an angle difference between the two waveforms by the controller based on the current waveform and the current I of the station terminal box side and the voltage waveform and the voltage U of the management terminal side
And power factor
Voltage information U at management terminal side, current information I at transformer station terminal box side and power factor
The loss value P of the transformer area is obtained through multiplication, the controller obtains a user loss value P2 at the management terminal side through the first communication device, the line loss value P3 is obtained by subtracting the user loss value P2 at the management terminal side from the loss value P of the transformer area, and the controller compares the line loss value P3 with the electricity stealing threshold value P4 to know that the electricity stealing risk or the electricity stealing situation exists.
7. The method for analyzing the line loss of the low-voltage transformer area according to claim 6, wherein the method comprises the following steps: in the online loss analysis step, when the electricity stealing threshold value P4 is larger than a 1% user loss value P2, the controller knows that the electricity stealing risk exists, and meanwhile, the detection frequency is improved, when the electricity stealing threshold value P4 is larger than a 2% user loss value P2, the controller knows that the electricity stealing situation exists, and the controller sends the electricity stealing risk or the electricity stealing situation to the outside; before the electricity stealing threshold P4 is determined, clustering analysis is carried out on the loss value P2 of the user based on a K-means clustering algorithm by taking one hour as a dividing line, and the threshold within one hour is obtained as the electricity stealing threshold P4.
8. The method for analyzing the line loss of the low-voltage transformer area according to claim 6, wherein the method comprises the following steps: in the line loss analysis step, the management terminal obtains voltage information U of a user and current information of the user sent by the intelligent electric meter, and calculates to obtain a user loss value P2; when the user loss value P2 is increased by one percent, the electricity stealing threshold value P4 is increased by one thousandth, and the formula shows that the normal threshold value is that the electricity stealing threshold value P4 is larger than 1% of the user loss value P2, the existence of the electricity stealing risk is determined, and when the electricity stealing risk is larger than 2% of the user loss value P2, the existence of the electricity stealing situation is determined; if the user loss value P2 is increased by one percent, the first threshold of the electricity stealing threshold P4 is a 1.1% user loss value P2, and the second threshold is a 2.1% user loss value P2; when the line loss abnormality exists, the accurate time of electricity stealing occurrence is determined through the analysis of the same hour on different dates or the same hour on the same date.
9. A low-voltage transformer area line loss analysis apparatus, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: the computer program comprises the line loss analysis module of claim 1, and the processor implements the corresponding steps of the method of any one of claims 6 to 8 when executing the computer program.
10. A low-voltage transformer area line loss analysis apparatus comprising a computer-readable storage medium storing a computer program, characterized in that: the computer program comprising the line loss analysis module of claim 1, the computer program when executed by a processor implementing the corresponding steps of the method of any one of claims 6 to 8.
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