CN111650535A - Electric energy meter wiring detection method - Google Patents
Electric energy meter wiring detection method Download PDFInfo
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- CN111650535A CN111650535A CN202010472365.XA CN202010472365A CN111650535A CN 111650535 A CN111650535 A CN 111650535A CN 202010472365 A CN202010472365 A CN 202010472365A CN 111650535 A CN111650535 A CN 111650535A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention provides a method for detecting the wiring of an electric energy meter, which comprises the following steps: step S10, pre-dividing all the wiring of the electric energy meter into four voltage wires and six current wires, and respectively connecting the four voltage wires and the six current wires to a voltage wire connection region and a current wire connection region of the electric energy meter wiring detection device; step S11, starting a current terminal test, and determining outgoing lines of the three groups of current transformers through a variable parameter oscillation circuit connected with a current line connection area; step S12, applying periodic step impulse current to each voltage line, testing the outgoing lines of the matched current transformer in turn, and calibrating the corresponding relation between the current transformer and the current voltage line according to the secondary oscillation attenuation signal of the current transformer; and step S13, determining the access sequence of each group of current transformers according to the polarity of each oscillation attenuation signal, and outputting the result. By implementing the method and the device, the accuracy of judging the wiring relation of the electric energy meter is improved, the work complexity of field operation and maintenance personnel is reduced, and the work efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electric power safety, in particular to a method for detecting the wiring of an electric energy meter.
Background
With the continuous development of social economy, newly-built houses and factories are increased day by day, newly-installed electric energy meters are increased, the installation positions of the electric energy meters are often not in the same positions as voltage and current sensors, the phenomenon of artificial misconnection exists in the construction process, potential safety hazards exist after electrification, the inaccuracy of electric energy metering is caused, positive loss is brought to an electric power marketing department, and the potential safety hazards are brought to the safety power utilization of users. In order to improve the power supply service level and ensure accurate electric energy metering, an electric power company needs to check the wiring problem of the electric energy meter in time. Because the electric energy meter connecting line is generally arranged in the wall body, the checking needs to be checked when entering the home, sometimes even the checking is stopped when the checking is finished, the power supply service quality and the user power consumption experience are seriously influenced, in addition, the field wiring is more, the line is complex and changeable, the effective checking rate is lower, the checking needs to be carried out repeatedly, and the great labor and financial resources are consumed.
The existing detection device usually needs a plurality of persons to cooperate in the installation stage for measurement, the electric energy meter, especially the electric energy meter accessed by a three-phase mutual inductor, cannot be accurately judged, the adopted technology mainly adopts a method of transmitting a terminal signal and receiving at a meter end, and the method usually has the problem of coupling interference among lines.
Disclosure of Invention
The invention aims to provide a method for detecting the wiring of an electric energy meter, so as to ensure the accurate wiring of the electric energy meter, provide reliable and accurate technical means for the safe operation and accurate metering of equipment and ensure the personal safety of an operator.
In order to solve the technical problem, the invention provides a method for detecting the wiring of an electric energy meter, which is used for detecting the wiring of a three-phase electric energy meter connected with a three-phase mutual inductor, and comprises the following steps:
step S10, pre-dividing all the wiring of the electric energy meter into four voltage wires and six current wires, and respectively connecting the four voltage wires and the six current wires to a voltage wire connection region and a current wire connection region of the electric energy meter wiring detection device;
step S11, starting a current terminal test, and determining outgoing lines of the three groups of current transformers through a variable parameter oscillation circuit connected with a current line connection area;
step S12, applying periodic step impulse current to each voltage line, testing the outlet of the current transformer in turn, when receiving the secondary oscillation attenuation signal of the current transformer, calibrating the corresponding relation between the current transformer and the current voltage line;
and step S13, determining the access sequence of each group of current transformers according to the polarity of each oscillation attenuation signal.
Preferably, the step S11 further includes:
starting a current terminal test, preselecting two current lines to test the frequency of the variable parameter resonator, and leading the two lines to be a group of current transformer outgoing lines when the characteristic frequency of the two lines is in a preset interval, or leading the current transformer outgoing lines to the next step;
and disconnecting one current line, connecting other four current lines in turn, testing according to the steps, if the pairing is not successful, connecting four voltage lines in turn, and testing according to the steps until the pairing is successful.
Preferably, further comprising:
the method comprises the following steps of predetermining the corresponding relation between each phase voltage line and a current transformer:
the voltage loop applies a step impact signal i (t) to a phase voltage line for a preset time;
detecting the response characteristic of the current loop, and generating an oscillation-damped voltage signal u (t) u at two ends of the current transformer0e-at+jbtWherein u0 is 0+ response of the current transformer, a is a voltage attenuation index, b is oscillation frequency of the voltage, and the corresponding relation between each phase voltage line and the current transformer is obtained according to the oscillation attenuated voltage signal.
Preferably, further comprising: and recording a test result, analyzing a characteristic value of the acquired signal, and judging the wiring length of the current transformer.
Preferably, further comprising: in the specific testing process, the external low-frequency interference introduced by the connection is sequentially stored according to the judgment result, and the modulation effect of u (t) ═ k (t) · sinwt, k (t) represents the influence of the length of the connection on the frequency of the resonator, and the method comprises the following steps:
the input sampling value is DFT converted to obtain the frequency distribution f0, f1, f2, f3... fn of the input signal, n is the sampling point number,
performing iterative computation on fmax to obtain a frequency main value of the signal;
screening low-frequency components, wherein the screening range is 0-270 Hz, and acquiring the maximum value of the low-frequency components in the range to acquire the low-frequency main value of a signal;
and outputting the frequency principal value and the low-frequency component.
Preferably, the step S13 further includes: when step impact current is applied to a voltage loop, performing cross-correlation analysis on an oscillation signal and a periodic excitation source signal of the current loop to obtain relevant characteristics of the current loop and the applied voltage loop, wherein the relevant characteristics comprise:
inputting sampling data of the impulse current and the output voltages of the phase current transformers A, B and C;
judging the current phase sequence of the current transformer according to the pre-calculated corresponding relation between each phase voltage line and each current transformer;
judging the polarity of the wiring of the current transformer according to the impact current and the polarity of the output voltage signal of the current transformer;
and outputting the current phase sequence and polarity judgment result.
The embodiment of the invention has the following beneficial effects:
the invention provides a method for detecting the wiring of an electric energy meter, which is used for detecting and distinguishing connected voltage and current wires at the wiring end of the electric energy meter. The corresponding relation between the voltage phase sequence and the current sensor is found out respectively, meanwhile, the polarity judgment of the current transformer is included, the corresponding relation between the voltage loop and the current loop is judged according to the transient response of the voltage loop and the current loop, and the line sequence of the current transformer is detected according to the frequency characteristic of the current sensor. By implementing the embodiment of the invention, the accurate detection of the wiring state of the electric energy meter can be realized, and a reliable detection method is provided for the safe operation of the electric energy meter.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a wiring structure of an electric energy meter wiring detection device and an electric energy meter according to the present invention;
fig. 2 is a schematic main flow chart of a method for detecting the wiring of an electric energy meter according to the present invention;
FIG. 3 is a more detailed flowchart of step S13 in FIG. 2;
fig. 4 is a more detailed flow chart of the steps involved in fig. 2 for analyzing the characteristic values of the acquired signals and determining the wiring length of the current transformer.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
The electric energy meter is used as an important device of an electric energy metering system, and the wiring of the electric energy meter is related to the running safety of the device and the metering accuracy, and referring to fig. 1, the electric energy meter is a typical wiring mode of a three-phase electric energy meter accessed by a typical three-phase mutual inductor. Four voltage lines of electric energy meter input ABCN, six electric current lines generally insert through the terminal box, and current transformer installs in the switch board output usually, and the wiring return circuit is longer, easily appears the misconnection phenomenon. And connecting the corresponding wire to the device manufactured according to the embodiment at the position of the junction box for detection, and identifying the wiring of the voltage transformer and the current transformer.
As shown in fig. 2, a schematic main flow chart of a method for detecting the wiring of an electric energy meter provided by the present invention is shown; in this embodiment, the method includes the steps of:
step S10, pre-dividing all the wiring of the electric energy meter into four voltage wires (ABCN) and six current wires (IA1& IA2, IB1& IB2, IC1& IC2), and respectively connecting the voltage wire connection region and the current wire connection region of the electric energy meter wiring detection device; at this time, the correspondence between the voltage and the current is the sequence during installation, and it can be understood that the correspondence is pre-division and is not necessarily accurate, and the detection and adjustment need to be performed through the following steps;
step S11, starting a current terminal test, and determining outgoing lines of the three groups of current transformers through a variable parameter oscillation circuit connected with a current line connection area;
in a specific example, the step S11 further includes:
starting a current terminal test, preselecting two current lines to test the frequency of the variable parameter resonator, and leading the two lines to be a group of current transformer outgoing lines when the characteristic frequency of the two lines is in a preset interval, or leading the current transformer outgoing lines to the next step;
and disconnecting one current line, connecting other four current lines in turn, testing according to the steps, if the pairing is not successful, connecting four voltage lines in turn, and testing according to the steps until the pairing is successful. It is understood that after the matching is successful, the rewiring operation can be performed according to the matching result, namely four voltage wires (ABCN) and six current wires (IA1& IA2, IB1& IB2, IC1& IC2) are respectively connected to the voltage wire connection region and the current wire connection region of the electric energy meter wiring detection device;
step S12, applying periodic step impulse current to each voltage line, testing the outlet of the current transformer in turn, when receiving the secondary oscillation attenuation signal of the current transformer, calibrating the corresponding relation between the current transformer and the current voltage line; similarly, the corresponding relationship of the current transformers corresponding to the three voltage lines can be found respectively.
It can be understood that the detection of the current transformer is based on the secondary characteristic of the current transformer, i.e. equivalent to an inductor, and the current transformer is connected to a variable parameter oscillating circuit, which changes the output frequency of the resonator and judges whether the connected secondary side of the current transformer is the secondary side of the current transformer according to the frequency.
In the embodiment of the present invention, it is necessary to determine in advance a correspondence between each phase voltage line and a current transformer, and the method specifically includes the following steps:
the voltage loop applies a step impact signal i (t) to a phase voltage line for a preset time;
detecting the response characteristic of the current loop, and generating an oscillation-damped voltage signal u (t) u at two ends of the current transformer0e-at+jbtWherein u0 is 0+ response of the current transformer, a is a voltage attenuation index, b is oscillation frequency of the voltage, and the corresponding relation between each phase voltage line and the current transformer is obtained according to the oscillation attenuated voltage signal.
Preferably, further comprising: and recording a test result, analyzing a characteristic value of the acquired signal, and judging the wiring length of the current transformer.
Preferably, further comprising: in the specific testing process, the external low-frequency interference introduced by the connection is sequentially stored according to the judgment result, and the modulation effect of u (t) ═ k (t) · sinwt, k (t) represents the influence of the length of the connection on the frequency of the resonator, and the method comprises the following steps:
the input sampling value is DFT converted to obtain the frequency distribution f0, f1, f2, f3... fn of the input signal, n is the sampling point number,
iteratively calculating fmax (the maximum value in f) to obtain a frequency main value of the signal;
screening low-frequency components, wherein the screening range is 0-270 Hz, and acquiring the maximum value of the low-frequency components in the range to acquire the low-frequency main value of a signal;
and outputting the frequency principal value and the low-frequency component.
In a specific example, the step S13 further includes:
when step impact current is applied to a voltage loop, performing cross-correlation analysis on an oscillation signal and a periodic excitation source signal of the current loop to obtain relevant characteristics of the current loop and the applied voltage loop, wherein the relevant characteristics comprise:
inputting sampling data of the impulse current and the output voltages of the phase current transformers A, B and C;
judging the current phase sequence of the current transformer according to the pre-calculated corresponding relation between each phase voltage line and each current transformer;
judging the polarity of the wiring of the current transformer according to the impact current and the polarity of the output voltage signal of the current transformer;
and outputting the current phase sequence and polarity judgment result.
The embodiment of the invention has the following beneficial effects:
the invention provides a method for detecting the wiring of an electric energy meter, which is used for detecting and distinguishing connected voltage and current wires at the wiring end of the electric energy meter. The corresponding relation between the voltage phase sequence and the current sensor is found out respectively, meanwhile, the polarity judgment of the current transformer is included, the corresponding relation between the voltage loop and the current loop is judged according to the transient response of the voltage loop and the current loop, and the line sequence of the current transformer is detected according to the frequency characteristic of the current sensor. By implementing the embodiment of the invention, the accurate detection of the wiring state of the electric energy meter can be realized, and a reliable detection method is provided for the safe operation of the electric energy meter.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for detecting the wiring of an electric energy meter is used for detecting the wiring of a three-phase electric energy meter connected with a three-phase mutual inductor, and is characterized by comprising the following steps:
step S10, pre-dividing all the wiring of the electric energy meter into four voltage wires and six current wires, and respectively connecting the four voltage wires and the six current wires to a voltage wire connection region and a current wire connection region of the electric energy meter wiring detection device;
step S11, starting a current terminal test, and determining outgoing lines of the three groups of current transformers through a variable parameter oscillation circuit connected with a current line connection area;
step S12, applying periodic step impulse current to each voltage line, testing the outlet of the current transformer in turn, when receiving the secondary oscillation attenuation signal of the current transformer, calibrating the corresponding relation between the current transformer and the current voltage line;
and step S13, determining the access sequence of each group of current transformers according to the polarity of each oscillation attenuation signal, and outputting the result.
2. The method for detecting the wiring of the electric energy meter according to claim 1, wherein the step S11 further comprises:
starting a current terminal test, preselecting two current lines to test the frequency of the variable parameter resonator, and leading the two lines to be a group of current transformer outgoing lines when the characteristic frequency of the two lines is in a preset interval, or leading the current transformer outgoing lines to the next step;
and disconnecting one current line, connecting other four current lines in turn, testing according to the steps, if the pairing is not successful, connecting four voltage lines in turn, and testing according to the steps until the pairing is successful.
3. The method for detecting the wiring of the electric energy meter according to claim 2, further comprising:
the method comprises the following steps of predetermining the corresponding relation between each phase voltage line and a current transformer:
the voltage loop applies a step impact signal i (t) to a phase voltage line for a preset time;
detecting the response characteristic of the current loop, and generating an oscillation-damped voltage signal u (t) u at two ends of the current transformer0e-at+jbtWherein u0 is 0+ response of the current transformer, a is a voltage attenuation index, b is oscillation frequency of the voltage, and the corresponding relation between each phase voltage line and the current transformer is obtained according to the oscillation attenuated voltage signal.
4. The electric energy meter wiring detection method according to any one of claims 1 to 3, characterized by further comprising: and recording a test result, analyzing a characteristic value of the acquired signal, and judging the wiring length of the current transformer.
5. The electric energy meter wiring detection method according to any one of claims 1 to 3, characterized by further comprising: in the specific testing process, the external low-frequency interference introduced by the connection is sequentially stored according to the judgment result, and the modulation effect of u (t) ═ k (t) · sinwt, k (t) represents the influence of the length of the connection on the frequency of the resonator, and the method comprises the following steps:
the input sampling value is DFT converted to obtain the frequency distribution f0, f1, f2, f3... fn of the input signal, n is the sampling point number,
performing iterative computation on fmax to obtain a frequency main value of the signal;
screening low-frequency components, wherein the screening range is 0-270 Hz, and acquiring the maximum value of the low-frequency components in the range to acquire the low-frequency main value of a signal;
and outputting the frequency principal value and the low-frequency component.
6. The method for detecting the wiring of the electric energy meter according to claim 4, wherein the step S13 further comprises: when step impact current is applied to a voltage loop, performing cross-correlation analysis on an oscillation signal and a periodic excitation source signal of the current loop to obtain relevant characteristics of the current loop and the applied voltage loop, wherein the relevant characteristics comprise:
inputting sampling data of the impulse current and the output voltages of the phase current transformers A, B and C;
judging the current phase sequence of the current transformer according to the pre-calculated corresponding relation between each phase voltage line and each current transformer;
judging the polarity of the wiring of the current transformer according to the impact current and the polarity of the output voltage signal of the current transformer;
and outputting the current phase sequence and polarity judgment result.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113890647A (en) * | 2021-09-09 | 2022-01-04 | 国网上海市电力公司 | Communication detection method and system for anti-theft data of electric energy meter |
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| CN113890647B (en) * | 2021-09-09 | 2024-02-06 | 国网上海市电力公司 | Communication detection method and system for anti-theft data of electric energy meter |
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