CN109655782B - Three-phase electric energy meter wiring abnormity self-checking method and system - Google Patents
Three-phase electric energy meter wiring abnormity self-checking method and system Download PDFInfo
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- CN109655782B CN109655782B CN201910065753.3A CN201910065753A CN109655782B CN 109655782 B CN109655782 B CN 109655782B CN 201910065753 A CN201910065753 A CN 201910065753A CN 109655782 B CN109655782 B CN 109655782B
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Abstract
The invention relates to a three-phase electric energy meter wiring abnormity self-checking method and a three-phase electric energy meter wiring abnormity self-checking system.
Description
Technical Field
The invention relates to the technical field of electric energy meters, in particular to a method and a system for self-checking wiring abnormity of a three-phase electric energy meter.
Background
The abnormal wiring of the three-phase electric energy meter usually has the conditions of wrong connection of three-phase voltage, wrong connection of three-phase current lines and the like, and the results of serious influence on metering errors such as reverse metering, non-metering, less metering and the like of the electric energy meter can be caused after the wrong lines are connected.
At present, the main prevention measures for avoiding the abnormal wiring of the three-phase electric energy meter are as follows: the installation wiring and the process of the electric energy meter metering device are standardized, the installation and wiring results are manually checked, the wiring condition is regularly checked by line maintenance personnel, and the wiring is controlled by a user side so as to avoid the user from changing the wiring privately.
The current three-phase electric energy meter abnormal wiring prevention measures have the following problems: the method is limited by the technical levels of installation companies and field constructors, the error rate is high, and the actual effect is poor; the electric energy meters are large in quantity and wide in distribution, depend on manual inspection, and are high in maintenance cost and low in efficiency; and wiring abnormal information cannot be timely and quickly acquired, so that the influence caused by metering errors is further enlarged.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method and a system for self-checking wiring abnormality of a three-phase electric energy meter, which can timely and accurately detect wiring abnormality of the three-phase electric energy meter, reduce the influence of metering error of the electric energy meter caused by abnormal wiring, and reduce power supplier loss and customer complaints.
In order to achieve the purpose, the invention adopts the technical scheme that: a three-phase electric energy meter wiring abnormity self-checking method is characterized in that: the method comprises the following steps of,
s1, the internal abnormal wiring self-checking module of the three-phase electric energy meter judges whether the abnormal wiring flag bit of each phase of current line is set and whether the single detection of the wiring of each phase of current line is abnormal every time interval delta t;
s2, when the flag bit is not set and the current line wiring is abnormal in a single detection, adding 1 to the abnormal entry frequency, and when the flag bit is not set and the current wiring is normal, clearing the abnormal entry frequency; when the flag bit is set and the current line wiring single detection is abnormal, the abnormal exit frequency is cleared, and when the flag bit is set and the current line wiring single detection is normal, the abnormal exit frequency is increased by 1;
s3, when the number of abnormal entry times is added to 1, judging whether the number of abnormal entry times is larger than a set threshold value; when the number of abnormal exits is increased by 1, judging whether the number of abnormal exits is greater than a set threshold value;
s4, when the number of abnormal entering times is larger than the set threshold, the current line wiring abnormal flag bit is set, the current line wiring is displayed to be abnormal, the S1 is executed, and when the number of abnormal entering times is smaller than or equal to the set threshold, the S1 is executed; and when the abnormal exit frequency is greater than the set threshold, clearing the current wire abnormal wiring flag bit to display that the current wire abnormal wiring is cleared, returning to execute S1, and when the abnormal exit frequency is less than or equal to the set threshold, returning to execute S1.
Further, the method for determining whether the current line connection single detection in S1 is abnormal includes,
s11, judging whether the three-phase voltages are all larger than the threshold voltage by the internal abnormal wiring self-checking module, if so, executing S12, and if not, indicating that the wiring of the current line is normal;
s12, judging whether the voltage is in a reverse phase sequence, if so, setting the reverse phase sequence of the voltage to indicate that the wiring of the voltage line is abnormal, and if not, executing S13;
s13, judging whether the three-phase currents are all larger than the threshold current, if not, indicating that the current line is normal in wiring, and if so, executing S14;
and S14, judging whether the phase angle of each phase meets the requirement of the set range, if so, indicating that the current wire is normal, and if not, indicating that the current wire is abnormal.
Further, the method for determining whether the voltage in S12 is in the negative phase sequence is to determine that the voltage included angle θ ac between A, C phases is greater than the voltage included angle θ ab between A, B phases, if yes, clear the voltage wiring abnormality flag bit and clear the voltage negative phase sequence flag bit, and if not, set the voltage wiring abnormality and set the voltage negative phase sequence.
Further, in order to improve the detection accuracy, the determining method of whether the voltage in S12 is in the reverse phase sequence further includes, when θ ac is determined to be greater than θ ab, continuing to determine whether a voltage included angle θ ac between A, C phases and a voltage included angle θ ab between A, B phases satisfy: 250 degrees > theta ac > 230 degrees and 130 degrees > theta ab > 110 degrees, if yes, clearing the voltage wiring abnormal zone bit and clearing the voltage reverse phase sequence zone bit, and if not, setting the voltage wiring abnormal and setting the voltage reverse phase sequence.
Further, Δ t takes a value of 1 s.
Further, the set threshold is 60.
Further, the phase angle is set to range from-90 ° to 90 °.
Further, the setting range of the phase angle is 0 ° to 60 °.
Further, the threshold voltage is 0.6 times of the rated voltage, and the threshold current is 0.02 times of the rated current.
The utility model provides a three-phase electric energy meter wiring abnormity self-checking system, the system includes three-phase electric energy meter, power consumption information acquisition system and connects three-phase electric energy meter and power consumption information acquisition system's communication channel, the three-phase electric energy meter is including the sampling module that is used for gathering external voltage and current input signal, the display module that is used for showing electric energy meter wiring abnormity information, its characterized in that:
the three-phase electric energy meter also comprises an internal abnormal wiring self-checking module for executing the method;
the power consumption information acquisition system reads the wiring abnormal information of the three-phase electric energy meter through the communication channel and positions the abnormal wiring electric energy meter.
Compared with the prior art, the invention has the advantages that: the internal program of the three-phase electric energy meter judges the voltage of each phase, the current of each phase, the reverse phase sequence of the voltage and the phase angle of each phase to determine whether the wiring of the current wire is abnormal at a single detection, continuously detects the abnormal wiring condition of the current wire at certain intervals to finally determine the abnormal wiring condition of the current wire, displays or transmits the result to the electricity consumption information acquisition system, realizes the quick automatic detection of the abnormal wiring of the three-phase electric energy meter and feeds back the abnormal information, and has strong engineering application guiding significance for improving the metering accuracy of a power grid and checking and solving the abnormal wiring condition of the electric energy meter.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a process of determining whether a current line is abnormal according to an embodiment of the present invention.
Fig. 3 is a block diagram of a system architecture according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a flowchart illustrating an embodiment of the present invention, and the method for self-checking the wiring abnormality of the three-phase electric energy meter includes the following steps:
s1, the internal program of the three-phase electric energy meter detects abnormal wiring conditions of each phase current line of A, B, C once every time delta t, and judges whether an abnormal wiring flag bit of the current line is set and whether single detection of the current wiring is abnormal;
s2, when the flag bit is not set, when the single detection of the current line wiring is abnormal, the number of abnormal entry times is added with 1, and when the single detection of the current line wiring is normal, the number of abnormal entry times is cleared; when the flag bit is set, when the current line wiring is detected to be abnormal once, the abnormal exit frequency is cleared, and when the current line wiring is detected to be normal once, the abnormal exit frequency is increased by 1;
s3, judging whether the number of abnormal entries is larger than a set threshold value after adding 1 to the number of abnormal entries; judging whether the abnormal exit frequency is greater than a set threshold value or not after adding 1 to the abnormal exit frequency;
s4, when the number of abnormal entering times is larger than the set threshold, the current wire wiring abnormal flag bit is set, the current wire wiring abnormal is displayed, the execution returns to S1, and when the number of abnormal entering times is smaller than or equal to the set threshold, the execution returns to S1; and when the abnormal exit frequency is greater than the set threshold, clearing the current wire abnormal wiring flag bit, displaying that the current wire abnormal wiring is cleared and returning to execute S1, and when the abnormal exit frequency is less than or equal to the set threshold, returning to execute S1.
In this embodiment, the method for determining whether the current line connection is abnormal in a single detection includes the following steps,
s11, judging whether the three-phase voltages are all larger than the threshold voltage, if so, executing S12, and if not, detecting the current line wiring in a single time to be normal;
s12, because only after checking the abnormal connection of the voltage line, the current abnormal connection can be accurately judged, so whether the voltage is in a reverse phase sequence or not is judged, if yes, the reverse phase sequence of the voltage is set to indicate that the single detection of the connection of the voltage line is abnormal, and if not, S13 is executed;
s13, judging whether the three-phase currents are all larger than the threshold current, if not, detecting the current line wiring in a single time to be normal, and if so, executing S14;
and S14, judging whether each phase angle meets the requirement of the set range, if so, detecting the current line wiring in a single time normally, and if not, detecting the current line wiring in a single time abnormally.
The abnormal condition of the current line wiring is preliminarily determined through single detection of the current line wiring, the single detection is carried out once every interval delta t, and after multiple detections, when the continuous times of the initial abnormal condition reach a set threshold value, whether the current line wiring is abnormal or not is finally determined and displayed through a display to prompt management and maintenance personnel.
The self-checking method is continuously carried out to monitor the abnormal wiring condition of the three-phase electric energy meter at any time, so that managers can conveniently master the abnormal wiring condition in time.
Preferably, the voltage reverse phase sequence determination method is that a voltage included angle θ ac between A, C phases is determined to be larger than a voltage included angle θ ab between A, B phases, if yes, the voltage wiring abnormal flag bit is cleared, the voltage reverse phase sequence flag bit is cleared, and if not, the set voltage wiring is abnormal, and the voltage reverse phase sequence is set.
In order to improve the detection accuracy, the voltage negative phase sequence determining method further includes determining whether a voltage included angle θ ac between A, C phases and a voltage included angle θ ab between A, B phases satisfy: 250 degrees > theta ac > 230 degrees and 130 degrees > theta ab > 110 degrees, if yes, clearing the voltage wiring abnormal zone bit and clearing the voltage reverse phase sequence zone bit, and if not, setting the voltage wiring abnormal and setting the voltage reverse phase sequence.
In this embodiment, the value of Δ t is 1s, and of course, the value of Δ t may also be adjusted according to factors such as the use position of the three-phase electric energy meter, user requirements, and the like.
Preferably, the set threshold is 60, and the size of the set threshold is related to the accuracy of determining the wiring abnormality of the three-phase electric energy meter, the metering accuracy of the three-phase electric energy meter, and the like, and can be selected according to actual conditions.
Preferably, the phase angle setting range is-90 ° to 90 °, and as a further preference, a suitable phase angle range can be selected according to the field power utilization environment, and according to practical experience, the self-checking method has better accuracy when the phase angle setting range is 0 ° to 60 °.
Preferably, the threshold voltage is 0.6 times the rated voltage.
Preferably, the threshold current is 0.02 times the rated current.
The invention also provides a self-checking system for the wiring abnormity of the three-phase electric energy meter, which comprises the three-phase electric energy meter, a communication channel and an electricity utilization information acquisition system; the three-phase electric energy meter comprises a sampling module (not shown in the figure), an internal wiring abnormity self-checking module adopting the self-checking algorithm and a display module;
the three-phase electric energy meter samples external voltage and current input signals through a sampling module, detects the wiring state of the electric energy meter through an internal abnormal wiring self-checking algorithm and outputs an actual wiring state;
the display module is used for correspondingly displaying abnormal information on the electric energy meter when the electric energy meter detects that the current wiring is abnormal, so that the maintenance personnel of the electric power circuit can conveniently position abnormal points and timely maintain and correct the abnormality.
As an example, the abnormal information may be displayed in the following manner: for example, Err-XXXX, for example, Err-Ia shows abnormal connection of A-phase current, Err-Ib shows abnormal connection of B-phase current, Err-Ic shows abnormal connection of C-phase current, and includes Err-Iab, Err-Ibc, Err-Iac, Err-Iabc, etc.
The communication channel is used for realizing data interaction between the three-phase electric energy meter and the electricity utilization information acquisition system, and can transmit the abnormal wiring condition detected by the electric energy meter on site to the electricity utilization information acquisition system in real time; the communication channel mainly comprises: carrier wave, RS485, infrared, wireless module, etc.
The power consumption information acquisition system reads wiring abnormal information detected by the three-phase electric energy meter through the communication channel, positions the abnormal wiring electric energy meter, and timely maintains and corrects the abnormality.
In addition to the above-mentioned modifications, other similar modifications are also included in the scope of the modifications of the present invention, and are not described herein in detail.
While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A three-phase electric energy meter wiring abnormity self-checking method is characterized in that: the method comprises the following steps of,
s1, the internal abnormal wiring self-checking module of the three-phase electric energy meter judges whether the abnormal wiring flag bit of each phase of current line is set and whether the single detection of the wiring of each phase of current line is abnormal every time interval delta t;
s2, when the flag bit is not set and the current line wiring is abnormal in a single detection, adding 1 to the abnormal entry frequency, and when the flag bit is not set and the current wiring is normal, clearing the abnormal entry frequency; when the flag bit is set and the current line wiring single detection is abnormal, the abnormal exit frequency is cleared, and when the flag bit is set and the current line wiring single detection is normal, the abnormal exit frequency is increased by 1;
s3, when the number of abnormal entry times is added to 1, judging whether the number of abnormal entry times is larger than a set threshold value; when the number of abnormal exits is increased by 1, judging whether the number of abnormal exits is greater than a set threshold value;
s4, when the number of abnormal entering times is larger than the set threshold, the current line wiring abnormal flag bit is set, the current line wiring is displayed to be abnormal, the S1 is executed, and when the number of abnormal entering times is smaller than or equal to the set threshold, the S1 is executed; and when the abnormal exit frequency is greater than the set threshold, clearing the current wire abnormal wiring flag bit to display that the current wire abnormal wiring is cleared, returning to execute S1, and when the abnormal exit frequency is less than or equal to the set threshold, returning to execute S1.
2. The method of claim 1, further comprising:
the method for determining whether the current line connection in S1 is abnormal in a single detection includes,
s11, judging whether the three-phase voltages are all larger than the threshold voltage by the internal abnormal wiring self-checking module, if so, executing S12, and if not, indicating that the wiring of the current line is normal;
s12, judging whether the voltage is in a reverse phase sequence, if so, setting the reverse phase sequence of the voltage to indicate that the wiring of the voltage line is abnormal, and if not, executing S13;
s13, judging whether the three-phase currents are all larger than the threshold current, if not, indicating that the current line is normal in wiring, and if so, executing S14;
and S14, judging whether the phase angle of each phase meets the requirement of the set range, if so, indicating that the current wire is normal, and if not, indicating that the current wire is abnormal.
3. The method of claim 2, further comprising:
the judgment of whether the voltage in S12 is in the reverse phase sequence is performed,
and judging whether the voltage included angle theta ac among A, C phases is larger than the voltage included angle theta ab among A, B phases, if so, clearing a voltage wiring abnormal zone bit and clearing a voltage reverse phase sequence zone bit, and if not, setting the voltage wiring abnormal and setting the voltage reverse phase sequence.
4. The method of claim 3, further comprising:
the determining method of whether the voltage in S12 is in the reverse phase sequence further includes, when θ ac is greater than θ ab, continuously determining whether a voltage included angle θ ac between A, C phases and a voltage included angle θ ab between A, B phases satisfy: 250 degrees > theta ac > 230 degrees and 130 degrees > theta ab > 110 degrees, if yes, clearing the voltage wiring abnormal zone bit and clearing the voltage reverse phase sequence zone bit, and if not, setting the voltage wiring abnormal and setting the voltage reverse phase sequence.
5. The method of claim 1, further comprising:
the value of delta t is 1 s.
6. The method of claim 1, further comprising:
the set threshold is 60.
7. The method of claim 2, further comprising:
the phase angle is set to range from-90 ° to 90 °.
8. The method of claim 7, further comprising:
the phase angle is set to range from 0 ° to 60 °.
9. The method of claim 2, further comprising:
the threshold voltage is 0.6 times of rated voltage, and the threshold current is 0.02 times of rated current.
10. The utility model provides a three-phase electric energy meter wiring abnormity self-checking system, the system includes three-phase electric energy meter, power consumption information acquisition system and connects three-phase electric energy meter and power consumption information acquisition system's communication channel, the three-phase electric energy meter is including the sampling module that is used for gathering external voltage and current input signal, the display module that is used for showing electric energy meter wiring abnormity information, its characterized in that:
the three-phase electric energy meter further comprises an internal abnormal wiring self-checking module for executing the method according to any one of claims 1-9;
the power consumption information acquisition system reads the wiring abnormal information of the three-phase electric energy meter through the communication channel and positions the abnormal wiring electric energy meter.
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| CN110824409B (en) * | 2019-11-22 | 2022-04-05 | 周秀琴 | Three-phase three-wire electric energy meter wiring mode identification method, electric energy meter and equipment |
| CN111060754A (en) * | 2019-12-31 | 2020-04-24 | 南京新联智慧能源服务有限公司 | Electric energy information acquisition terminal with automatic phase sequence identification function and automatic phase sequence identification method |
| CN111722101B (en) * | 2020-05-29 | 2023-09-01 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
| CN113484627A (en) * | 2021-07-13 | 2021-10-08 | 中国第一汽车股份有限公司 | Wiring detection method and device for electric drive system and motor control system |
| CN113640710B (en) * | 2021-08-13 | 2024-04-09 | 深圳市新威尔电子有限公司 | Automatic detection method for channel crossing |
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| JP3374361B2 (en) * | 1997-04-04 | 2003-02-04 | 矢崎総業株式会社 | Vehicle abnormal current detecting method, vehicle abnormal current detecting device, and vehicle power supply device |
| KR100307747B1 (en) * | 1999-03-22 | 2001-09-26 | 배동만 | Remote inspecting system for automatically checking abnormal operation |
| JP3623492B2 (en) * | 2002-09-05 | 2005-02-23 | 本田技研工業株式会社 | Vehicle control system |
| CN102340808B (en) * | 2010-07-21 | 2015-08-26 | 中兴通讯股份有限公司 | Alert processing method and device |
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| CN103728137B (en) * | 2013-12-11 | 2016-03-16 | 力帆实业(集团)股份有限公司 | A kind of method detecting engine vvt mechanism in the engine thermal period of adjustment |
| CN106291086A (en) * | 2016-08-03 | 2017-01-04 | 宁波三星医疗电气股份有限公司 | A kind of electric energy meter metering abnormality detection and restoration methods |
| CN107831350B (en) * | 2017-09-14 | 2019-06-04 | 国家电网公司 | The method of line loss exception is judged based on electrical energy meter fault and typical fault wiring |
| CN109142960B (en) * | 2018-08-08 | 2021-05-07 | 国网重庆市电力公司电力科学研究院 | Three-phase three-wire metering device wrong wiring online discrimination method and system |
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