CN110940873A - Device and method for detecting topological relation between user electric meter and transformer - Google Patents
Device and method for detecting topological relation between user electric meter and transformer Download PDFInfo
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- CN110940873A CN110940873A CN201911107894.3A CN201911107894A CN110940873A CN 110940873 A CN110940873 A CN 110940873A CN 201911107894 A CN201911107894 A CN 201911107894A CN 110940873 A CN110940873 A CN 110940873A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- 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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Abstract
The invention relates to a detection device and a detection method for topological relation between a user electric meter and a transformer, and the detection device comprises a voltage modulation module, a user electric meter data acquisition module and a user electric meter data analysis module, wherein the voltage modulation module is arranged between a transformer outlet end and a user line in a transformer area and comprises a voltage modulation circuit and a controller, the voltage modulation circuit comprises an alternating current/alternating current converter and a compensation transformer which are sequentially connected, and the controller is connected with the alternating current/alternating current converter; the user electric meter data acquisition module is connected with a user electric meter and used for acquiring voltage data of the user electric meter; and the user electric meter data analysis module is connected with the user electric meter data acquisition module and judges the transformer line relation to which the user electric meter belongs according to the voltage data. Compared with the prior art, the method has the advantages of convenience in adjustment, accurate and quick judgment result and the like.
Description
Technical Field
The invention relates to a distribution area identification method, in particular to a device and a method for detecting topological relation between a user electric meter and a transformer.
Background
In recent years, with the continuous progress of urbanization development, residential districts are continuously increased, the power load is increased, and the number of newly-added transformer districts is huge, so that a plurality of technical problems are exposed, for example, illegal power utilization of some low-voltage users, private wiring circuits and the like exist, and the power utilization safety is seriously influenced. It is important to accurately identify the district transformer to which each consumer meter belongs and the phase line of the transformer to which the single-phase meter belongs. Therefore, there is an increasing need for an efficient way to identify the subscriber relationship of a cell.
Since old users frequently change connections and new users are increasing, it is necessary to perform station-to-station subscriber relationship identification every year. At an early stage, it requires field inspection by the staff of the electric company. In this way, staff need inspect the circuit and record manually, and the inefficiency easily leads to the mistake. Later, with the development of power line communication, an identification method based on power line communication was produced, in which information is modulated into a high frequency signal, and at the user side, the signal is received and demodulated by an additional device. However, high frequency signals are susceptible to attenuation and distortion due to long distances and load variations. Furthermore, high frequency signals may enter other areas through transformers and may couple with other lines, which may lead to misreadings. In order to solve the problem, researchers combine power line communication with pulse current, but the pulse current method has potential safety hazards, and workers still need to operate manually. Industrial frequency communication has also been proposed to overcome these drawbacks, however, in this method, additional devices are still required to be installed on the transformer and user side, and the solution is very complicated.
In summary, the current scheme used at home and abroad is as follows:
(1) power line carrier communication mode
The communication carrier of the cable carrier communication mode is a power line of a distribution network, and the station identification mode is to modulate high-frequency coding information at the outlet side of a distribution transformer, transmit the high-frequency coding information through the power line of the distribution network and reach a receiving device at a client side, so that the station attribution judgment and the phase sequence identification are realized. The method for identifying the transformer area has the advantages that the method can realize plug and play in the field operation process, the equipment does not need to be maintained, and the use is very convenient. The basic working principle is as follows:
the main communication device sends data to the outside, the data contains station area number and phase sequence information, the data enters the buffer area of the central processor through the interface, and modulation coding is carried out on the data, so that the data can be coupled to the power line of the low-voltage outlet of the power distribution network for transmission. The receiver of the user side is positioned at the other end of the power line, decouples the station area number and the phase information, receives the signals from the power line, decodes the signals through a built-in processor, performs secondary coding, and finally transmits the signals to the display through the communication interface.
The power line carrier communication mode is adopted for station area identification, and the station area identification generally comprises two parts in the actual operation process: a host; the medium for the hand-held terminal, the host and the terminal to contact is a carrier signal transmitted on a power line. The operation method comprises the following steps: firstly, an inspector installs a host at a low-voltage outlet terminal of a transformer to be detected or a metering box of a transformer area, and a terminal is installed at an inlet terminal of a user meter to be detected remotely. Taking three-phase voltage as an example, the host is connected to the transformer A, the terminal is supposed to be connected to the B-phase cable of the user to be detected, and the handheld terminal is also installed on the B-phase cable. The host computer sends a carrier signal to the handheld terminal, the handheld terminal receives the signal through the receiving device and displays the marking information and the phase information of the transformer A through the screen, and at the moment, the detected client belongs to the transformer A and is connected to the phase cable of the transformer B, so that the station area identification is realized. On the contrary, if the host is connected to other transformers and sends a carrier signal to the terminal, the terminal cannot receive the signal, which indicates that the detected user does not belong to the transformer in principle.
(2) By combining FSK power carrier signal method with pulse current method
The method adopts a mode of combining an FSK power carrier signal method and a pulse current method to judge the affiliation of a station area, and the basic principle is as follows: firstly, the hand-held terminal sends out a pulse current signal, the host machine detects the pulse current signal through the built-in pulse current detector, then re-encodes the signal, modulates a carrier signal and loads the carrier signal on a power line, and if the hand-held terminal receives the carrier signal, the user is powered by the transformer.
1) System architecture
The system principle of the method for identifying the transformer area is as follows: firstly, a handheld terminal sends a pulse current signal outwards, a host at a remote place actively triggers a power line carrier signal after detecting the pulse current signal through a pulse current detection device, codes identification numbers, phase sequences and other data of a distribution area, modulates the data into a carrier signal, and couples the carrier signal to a power line measured at a low-voltage outlet of a power distribution network for transmission. And the handheld terminal of the user side to be detected receives the carrier signal, decouples transformer information and the like transmitted by the host from the power line, analyzes and codes the transformer information and the like through the built-in processor, and displays the result in the display device.
2) In situ use
The device for identifying the transformer area by the pulse current method and the power line carrier communication is also composed of two parts: a host; provided is a handheld terminal. When the transformer is operated on site, the host is connected in the metering box of the distribution transformer area according to the sequence, and the pulse current detection clamp is clamped on the zero line cable of the transformer. And at the detected user end, the red clip of the handheld terminal is clamped on a live wire, the black clip is clamped on a zero wire, the waiting time is about 1 minute, and the transformer information and the phase sequence information which the detected client belongs to are displayed on the display of the terminal. This determines the zone affiliation of the client.
The two methods are very simple and intuitive for identifying the transformer area and are very wide in application, but in the actual use process, some problems are found, for example, the covered area of some transformer areas is large, buried cables are mutually crossed, the load of a line path causes the carrier signal to generate anti-interference in the transmission process, or the amplitude of the carrier signal is attenuated and the resolving power is reduced under the conditions of attenuation, noise and overweight load generated in the operation process of a low-voltage power grid, so that the comprehensive coverage of the low-voltage power distribution network cannot be performed, and the accuracy and the stability of the transformer area identification are influenced. More importantly, due to the working mode of carrier communication, the phenomena of common cable channel, common ground and common high voltage are easy to occur in the transmission process of adjacent transformers; and the signal interference of the communication base station is also a factor which can cause identification misjudgment, and can cause common high voltage crosstalk, common ground crosstalk and parallel transmission crosstalk of carrier signals.
From the actual operation on site, most of the current platform area identification devices adopt a PC (personal computer) mode and a slave mode as handheld terminals, are large in size, heavy and not easy to carry, adopt a host three-phase sending mode and adopt a slave receiving single-phase communication mode, and are low in testing speed; the result is inaccurate, but the price is high, and the function is single. Therefore, the research on a platform area identification technology which can improve the communication reliability and stability, realize the comprehensive coverage of a low-voltage platform area, and has the advantages of accurate, quick and visual result judgment, small volume, light weight, convenient carrying and low price is the development trend in the future.
Disclosure of Invention
The invention aims to overcome the problems of low accuracy and stability of district identification in the prior art, and provides a device and a method for detecting the topological relation between a user electric meter and a transformer.
The purpose of the invention can be realized by the following technical scheme:
a device for detecting topological relation between a user electric meter and a transformer comprises a voltage modulation module, a user electric meter data acquisition module and a user electric meter data analysis module, wherein,
the voltage modulation module is arranged between the transformer outlet end of the transformer in the transformer area and a user line, and comprises a voltage modulation circuit and a controller, wherein the voltage modulation circuit comprises an alternating current/alternating current converter and a compensation transformer which are sequentially connected, and the controller is connected with the alternating current/alternating current converter;
the user electric meter data acquisition module is connected with a user electric meter and used for acquiring voltage data of the user electric meter;
and the user electric meter data analysis module is connected with the user electric meter data acquisition module and judges the transformer line relation to which the user electric meter belongs according to the voltage data.
Further, one transformer is provided with one voltage modulation module.
Further, the input end of the AC/AC converter is connected with the secondary side of the transformer area, the output end of the AC/AC converter is connected with the primary end of the compensation transformer, the secondary end of the compensation transformer is connected with the transformer area in series, and the AC/AC converter generates voltage which is in the same phase or opposite phase with the secondary side of the transformer area.
Furthermore, the user electric meter data acquisition module is connected with the user electric meter in a wireless, communication cable or power line carrier communication mode.
Furthermore, the user electric meter data acquisition module comprises meter reading equipment and a database server.
Further, the user electricity meter data analysis module comprises:
the modulation signal acquisition unit is used for extracting a real-time modulation signal by using a cross-correlation function according to the voltage data;
and the household variable relation identification unit is used for comparing the real-time modulation signal with a pre-stored modulation signal and identifying and obtaining the transformer line relation to which the user electric meter belongs.
The invention also provides a method for detecting the topological relation between the user electric meter and the transformer by adopting the detection device, which comprises the following steps:
the controller controls the output voltage of the alternating current/alternating current converter according to a pre-stored modulation signal, and the output voltage is superposed on an output line of the transformer area through the compensation transformer;
and collecting voltage data of each user electric meter, and judging and obtaining the transformer line relation of each user electric meter according to the voltage data and a prestored modulation signal.
Further, each zone transformer has an independent pre-stored modulation signal.
Further, the step of judging and obtaining the transformer line relationship to which each user electricity meter belongs according to the voltage data and the pre-stored modulation signal specifically includes:
and extracting a real-time modulation signal by using a cross-correlation function according to the voltage data, comparing the real-time modulation signal with a pre-stored modulation signal, and identifying and obtaining the transformer line relation to which the user ammeter belongs.
Further, the method further comprises:
and visually displaying the real-time modulation signal and a pre-stored modulation signal.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention utilizes the voltage data to judge the line relation of the transformer to which the user ammeter belongs, and the judgment result is accurate and quick;
2) the voltage modulation circuit is formed by the AC/AC converter and the compensating transformer, has simple structure, small volume and low cost, can conveniently control the output voltage to increase or decrease, and has high control precision;
3) according to the invention, each line adopts a unique modulation signal to modulate the line output voltage, and the modulation signal is used as line identification information, so that a judgment result can be quickly obtained;
4) the invention has the visualization function and the judgment result is visual.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a voltage modulation circuit according to the present invention;
fig. 3 is a schematic diagram of an output voltage of a voltage modulation module according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, this embodiment provides a device for detecting topological relation between a user electric meter and a transformer, which includes a voltage modulation module 2, a user electric meter data acquisition module 5, and a user electric meter data analysis module 6, where the voltage modulation module 2 is installed between a line outlet of the transformer 1 and a user line, the user line includes a user electric meter 3 and a user load 4, the user electric meter data acquisition module 5 is connected to the user electric meter 3, and the user electric meter data analysis module 6 is connected to the user electric meter data acquisition module 5. The device detects the transformer corresponding to the user-side ammeter and a certain phase line of the transformer in a mode of disturbing the output voltage amplitude of the transformer.
One of the zone transformers 1 is provided with one of the voltage modulation modules 2 such that each zone transformer has an independent pre-stored modulation signal, as shown in fig. 3.
The voltage modulation module 2 is used for modulating the voltage output by the transformer 1 to a set amplitude. As shown in fig. 2, the voltage modulation module 2 includes a voltage modulation circuit including an ac/ac converter 21 and a compensation transformer 22 connected in sequence, and a controller connected to the ac/ac converter 21 and controlling an output voltage of the ac/ac converter 21. The input end of the AC/AC converter 21 is connected with the secondary side of the transformer 1, the output end is connected with the primary end of the compensation transformer 22, the secondary end of the compensation transformer 22 is connected with the transformer 1 in series, the AC/AC converter 21 generates the voltage which is in the same phase or opposite phase with the secondary side of the transformer 1, and therefore the output voltage of the voltage modulation module can be controlled to increase or decrease. The ac/ac converter 21 can control the output voltage as needed and superimpose the output voltage on the output line of the station transformer 1 through the compensating transformer 22. In this way, a specific signal can be modulated onto the amplitude of the secondary output voltage of the transformer in the transformer area.
The voltage modulation module 2 modulates the line output voltage with a unique modulation signal, so that the output line voltage of each transformer has line identification information.
And the user electric meter data acquisition module 5 is used for acquiring and storing the voltage data of the user electric meter at regular time. In this embodiment, the user electric meter data acquisition module 5 is connected with the user electric meter 3 in a wireless manner, and the user electric meter data acquisition module 5 includes a centralized meter reading device and a database server. The centralized meter reading equipment is arranged at the user side.
In some embodiments, the user meter data collecting part 5 may also be connected to the user meter 3 through a communication cable or a power line carrier communication manner.
The user electric meter data analysis module 6 judges the transformer line relation to which the user electric meter belongs according to the voltage data, and the method comprises the following steps: the modulation signal acquisition unit is used for reading the voltage data stored in the database server and extracting a real-time modulation signal by utilizing a cross-correlation function; and the household variable relation identification unit is used for comparing the real-time modulation signal with a pre-stored modulation signal and identifying and obtaining the transformer line relation to which the user electric meter belongs.
The working process of the device for detecting the topological relation between the user electric meter and the transformer comprises the following steps:
the controller controls the output voltage of the alternating current/alternating current converter according to a pre-stored modulation signal, and the output voltage is superposed on an output line of the transformer area through the compensation transformer;
collecting voltage data of each user electric meter, extracting a real-time modulation signal by using a cross-correlation function according to the voltage data, comparing the real-time modulation signal with a pre-stored modulation signal, and identifying and obtaining the line relation of a transformer to which the user electric meter belongs
In this embodiment, the method further includes: and visually displaying the real-time modulation signal and a pre-stored modulation signal.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concept of the present invention should be within the protection scope determined by the present invention.
Claims (10)
1. A topological relation detection device of a user electric meter and a transformer is characterized by comprising a voltage modulation module (2), a user electric meter data acquisition module (5) and a user electric meter data analysis module (6), wherein,
the voltage modulation module (2) is arranged between a line outlet end of the transformer (1) of the transformer area and a user line, and comprises a voltage modulation circuit and a controller, wherein the voltage modulation circuit comprises an alternating current/alternating current converter (21) and a compensating transformer (22) which are sequentially connected, and the controller is connected with the alternating current/alternating current converter (21);
the user electric meter data acquisition module (5) is connected with the user electric meter (3) and is used for acquiring voltage data of the user electric meter (3);
and the user electric meter data analysis module (6) is connected with the user electric meter data acquisition module (5) and judges the transformer line relation to which the user electric meter belongs according to the voltage data.
2. The device for detecting topological relation between consumer electricity meters and transformers according to claim 1, characterized in that one transformer (1) is configured with one voltage modulation module (2).
3. The consumer meter and transformer topology relationship detection device according to claim 1, wherein the input terminal of the ac/ac converter (21) is connected to the secondary side of the transformer (1), the output terminal is connected to the primary terminal of the compensation transformer (22), the secondary terminal of the compensation transformer (22) is connected in series with the transformer (1), and the ac/ac converter (21) generates a voltage in phase or in anti-phase with the secondary side of the transformer (1).
4. The device for detecting the topological relation between the user electric meter and the transformer according to claim 1, wherein the user electric meter data acquisition module (5) is connected with the user electric meter in a wireless, communication cable or power line carrier communication mode.
5. The device for detecting the topological relation between the user electric meter and the transformer according to claim 1, wherein the user electric meter data acquisition module (5) comprises a meter reading device and a database server.
6. The device for detecting the topological relation between a consumer meter and a transformer according to claim 1, wherein said consumer meter data analysis module (6) comprises:
the modulation signal acquisition unit is used for extracting a real-time modulation signal by using a cross-correlation function according to the voltage data;
and the household variable relation identification unit is used for comparing the real-time modulation signal with a pre-stored modulation signal and identifying and obtaining the transformer line relation to which the user electric meter belongs.
7. A method for detecting topological relation between a user electric meter and a transformer by using the detection device as claimed in claim 1, comprising the following steps:
the controller controls the output voltage of the alternating current/alternating current converter (21) according to a pre-stored modulation signal, and the output voltage is superposed on an output line of the transformer (1) of the transformer area through a compensation transformer (22);
and collecting voltage data of each user electric meter (3), and judging and obtaining the transformer line relation of each user electric meter according to the voltage data and a prestored modulation signal.
8. The method for detecting topological relation between user electricity meters and transformers according to claim 7, wherein each regional transformer (1) has an independent pre-stored modulation signal.
9. The method according to claim 7, wherein the step of determining and obtaining the relationship between the transformer lines to which the user electricity meters belong according to the voltage data and the pre-stored modulation signal specifically comprises:
and extracting a real-time modulation signal by using a cross-correlation function according to the voltage data, comparing the real-time modulation signal with a pre-stored modulation signal, and identifying and obtaining the transformer line relation to which the user ammeter belongs.
10. The method of claim 9, further comprising:
and visually displaying the real-time modulation signal and a pre-stored modulation signal.
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Cited By (2)
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Application publication date: 20200331 |