CN117538814A - Method, device, equipment and medium for judging faults of three-phase four-wire intelligent electric energy meter - Google Patents

Method, device, equipment and medium for judging faults of three-phase four-wire intelligent electric energy meter Download PDF

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Publication number
CN117538814A
CN117538814A CN202311501733.9A CN202311501733A CN117538814A CN 117538814 A CN117538814 A CN 117538814A CN 202311501733 A CN202311501733 A CN 202311501733A CN 117538814 A CN117538814 A CN 117538814A
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China
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current
electric energy
energy meter
intelligent electric
absolute value
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CN202311501733.9A
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Inventor
常仕亮
郑可
徐鸿宇
杨浩
刘拧滔
何珉
邹波
万树伟
曾鸣钟
谭涛
米思蓓
牟攀
吴宇
冯凌
周川
傅宏
吴林峰
刘林锋
朱贺
段俊
刘昊耘
谭时顺
王雪松
张怡航
冉航舟
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State Grid Chongqing Electric Power Co Marketing Service Center
State Grid Corp of China SGCC
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State Grid Chongqing Electric Power Co Marketing Service Center
State Grid Corp of China SGCC
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Priority to CN202311501733.9A priority Critical patent/CN117538814A/en
Publication of CN117538814A publication Critical patent/CN117538814A/en
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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
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

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  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The application relates to the field of power technology. A method, device, equipment and medium for judging faults of a three-phase four-wire intelligent electric energy meter are disclosed. Wherein. The method comprises the following steps: acquiring power factors, voltages and currents of an intelligent electric energy meter, a first element, a second element and a third element at a sampling moment; judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule; when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element. The intelligent ammeter fault judging method is not limited by personnel skill level, and is accurate, automatic and intelligent, and testing is not needed through instruments and meters.

Description

Method, device, equipment and medium for judging faults of three-phase four-wire intelligent electric energy meter
Technical Field
The application relates to the technical field of electric power, in particular to a method, a device, equipment and a medium for judging faults of a three-phase four-wire intelligent electric energy meter.
Background
The intelligent electric energy meter is an important information monitoring device in the internet of things system and is indispensable in industrial automation, power distribution management, energy management, property charging and other applications, so that the intelligent electric energy meter needs to be checked and maintained regularly.
When checking and maintaining the intelligent electric energy meter, the staff is required to use the instruments and meters to test, so that the working intensity is increased, and the skill level of the staff is limited.
It has been a problem in the industry to find a way to automatically identify faults in an intelligent ammeter.
Disclosure of Invention
Aiming at the situation, the embodiment of the application provides a method, a device, equipment and a medium for judging faults of a three-phase four-wire intelligent electric energy meter, which aim to solve the problems or at least partially solve the problems.
In a first aspect, the present application provides a method for determining a fault of a three-phase four-wire intelligent electric energy meter, including:
respectively acquiring power factors, voltages and currents of an intelligent electric energy meter, a first element, a second element and a third element at a sampling moment;
judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current;
when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element.
In a second aspect, a device for judging faults of a three-phase four-wire intelligent ammeter is provided, including:
the acquisition module is used for respectively acquiring the power factors, the voltages and the currents of the intelligent electric energy meter, the first element, the second element and the third element at one sampling moment;
the judging module is used for judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current;
the intelligent ammeter fault detection module is used for judging whether the intelligent ammeter is faulty or not according to the power factor of the intelligent ammeter, the power factor of the first element, the power factor of the second element and the power factor of the third element when the intelligent ammeter is judged to be required to be started based on a preset fault detection starting rule.
In a third aspect, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for determining a fault of a three-phase four-wire intelligent ammeter as described above when the computer program is executed.
In a fourth aspect, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method for determining a fault of a three-phase four-wire smart electric energy meter as described above.
The above-mentioned at least one technical scheme that this application embodiment adopted can reach following beneficial effect:
the intelligent ammeter fault judging method is not limited by personnel skill level, does not need to be tested through instruments and meters, and can accurately, automatically and intelligently judge whether the three-phase four-wire intelligent ammeter has faults or not through intelligent ammeter data.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic diagram of an application environment of a method for determining faults of a three-phase four-wire intelligent ammeter according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining faults of a three-phase four-wire intelligent ammeter according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a specific implementation of step 40 of a method for determining a fault of a three-phase four-wire intelligent ammeter according to an embodiment of the present invention;
FIG. 4 is a phasor diagram of a three-phase four-wire smart meter in accordance with one embodiment of the present invention;
FIG. 5 is a schematic diagram of a device for determining faults of a three-phase four-wire intelligent ammeter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a computer device according to an embodiment of the invention;
FIG. 7 is a schematic diagram of another embodiment of a computer device according to the present invention.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that such uses may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "include" and variations thereof are to be interpreted as open-ended terms that mean "include, but are not limited to.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
As described above, the verification and maintenance of the current intelligent electric energy meter require that the staff use the instruments and meters to test, which increases the working intensity and is limited by the skill level of the staff. In order to solve the technical problem, the embodiment of the application provides a method for judging faults of a three-phase four-wire intelligent ammeter.
The method for judging the faults of the three-phase four-wire intelligent electric energy meter provided by the embodiment of the invention can be applied to an application environment as shown in fig. 1, wherein the equipment end communicates with the service end through a network. The server side can respectively acquire the power factors, the voltages and the currents of the intelligent electric energy meter, the first element, the second element and the third element at one sampling moment through the equipment side; judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current; when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element. The judging method of the three-phase four-wire intelligent electric energy meter fault adopts the power factor, the voltage and the current generated by the intelligent electric energy meter to judge the fault, is not limited by personnel skill level, does not need to be tested through instruments and meters, and can accurately, automatically and intelligently judge whether the three-phase four-wire intelligent electric energy meter has the fault or not through intelligent electric energy meter data.
The device end can be, but not limited to, various data acquisition devices and communication devices which are arranged on the intelligent electric energy meter. The server may be implemented by a stand-alone server or a server cluster formed by a plurality of servers. The present invention will be described in detail with reference to specific examples.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for determining faults of a three-phase four-wire intelligent ammeter according to an embodiment of the present invention, including the following steps:
s10: and respectively acquiring the power factors, the voltages and the currents of the intelligent electric energy meter, the first element, the second element and the third element at one sampling moment.
It can be understood that, in this embodiment, a plurality of sampling moments are set, power factors, voltages and currents of the intelligent ammeter, the first element, the second element and the third element at each sampling moment are respectively obtained, data at each sampling moment are processed, and whether the intelligent ammeter at each sampling moment has a fault is judged.
It can be understood that the first element, the second element and the third element are all metering elements in the intelligent electric energy meter.
Specifically, the power factors, voltages and currents of the intelligent electric energy meter, the first element, the second element and the third element comprise: the power factor of the intelligent electric energy meter, the rated voltage of the intelligent electric energy meter, the rated current of the intelligent electric energy meter, the power factor of the first element, the voltage of the first element, the current of the first element, the power factor of the second element, the voltage of the second element, the current of the second element, the power factor of the third element, the voltage of the third element and the current of the third element.
It can be understood that the power factor of the intelligent electric energy meter in this embodiment is the total power factor of the intelligent electric energy meter.
S20: and judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current.
In this embodiment, for a user metering point or an internal checking metering point metered by a three-phase four-wire intelligent electric energy meter, when the first element current, the second element current and the third element current meet a preset fault identification starting rule, fault identification is started in a load basically symmetrical state.
Specifically, step S20 judges whether the intelligent electric energy meter starts fault recognition based on a preset fault recognition start rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current, and the third element voltage and current, including:
when the first element voltage, the second element voltage and the third element voltage all accord with a preset voltage judgment rule, and the first element current, the second element current and the third element current all accord with a preset current judgment rule, the intelligent electric energy meter is judged to need to start fault identification.
Specifically, the method comprises the following steps: the first condition is satisfied: when the first element voltage, the second element voltage and the third element voltage are within a preset voltage range. In this embodiment, the voltage of the intelligent ammeter includes the rated voltage U of the intelligent ammeter n The preset voltage range is 90% of rated voltage of the intelligent electric energy meter. That is to sayFirst element voltage U a Voltage U of second element b Voltage U of third element c Respectively satisfying the formula (1-1):
U a ≥0.9U n 、U b ≥0.9U n 、U c ≥0.9U n (1-1)
and, the second condition is satisfied: when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a preset current range, obtaining the maximum value of the absolute value of the three-phase current and the minimum value of the absolute value of the three-phase current according to the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current, and judging that the difference value between the maximum value of the absolute value of the three-phase current and the minimum value of the absolute value of the three-phase current is in a preset fault identification starting range. And judging that the intelligent electric energy meter needs to start fault identification when the first condition and the second condition are met simultaneously.
The second condition specifically includes:
comparing the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current to obtain the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current. In this embodiment, by comparing the first element current I a Absolute value of (2) second element current I b Absolute value of (3) third element current I c Obtaining the maximum value I 'of the absolute value in the three-phase current' max And a minimum value I 'of absolute values in the three-phase current' min 。
When the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a first preset current range, judging that the ratio of the absolute value of the difference to the maximum value of the absolute values in the three-phase currents is in a first preset fault identification starting range. It should be noted that, in this embodiment, the current of the intelligent ammeter includes rated current I of the intelligent ammeter n The first preset current range is not more than rated current I of the intelligent electric energy meter n 5% -50% of the absolute value of the three-phase current, the first preset fault identification starting range is not more than the maximum value I 'of the absolute value of the three-phase current' max 20% of (C). That is, when the first element current I a Absolute value of (2) second element current I b Absolute value of (3) third element current I c The absolute value of (2) satisfies the formula (1-2), and the maximum value I 'of the absolute value in the three-phase current is judged' max And a minimum value I 'of absolute values in the three-phase current' min When the difference satisfies the formula (1-3), the second condition is satisfied:
50％I n ≥|I a |≥5％I n ，50％I n ≥|I b |≥5％I n ，50％I n ≥|I c |≥5％I n ， (1-2)
I′ max -I′ min ≤20％I′ max (1-3)
in the formula, according to the rules and logic relations presented under different inductive and capacitive load characteristic states, a current imbalance coefficient of 20% is introduced, and the coefficient can be adjusted in real time according to the required judgment accuracy.
It should be noted that, when rated secondary current of the current transformer in the middle is 5A, rated current I of the intelligent electric energy meter n 1.5A, rated current I of intelligent electric energy meter when rated secondary current of current transformer is 1A n 0.3A.
Or,
and when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a second preset current range, judging that the difference value is in a second preset fault identification starting range. It should be noted that, in this embodiment, the current of the intelligent ammeter includes rated current I of the intelligent ammeter n The second preset current range is larger than rated current I of the intelligent electric energy meter n Not exceeding 50% of the absolute value of the maximum value I 'in the three-phase current' max The second preset fault identification start-up range is no more than 0.2A and no less than 0A. That is, when the first element current I a Absolute value of (2) second element current I b Absolute value of (3) third element current I c The absolute value of (2) satisfies the formula (1-4), and the maximum value I 'of the absolute value in the three-phase current is judged' max And a minimum value I 'of absolute values in the three-phase current' min When the difference satisfies the formula (1-5), the second condition is satisfied:
I max ≥|I a |＞50％I n ，I max ≥|I b |＞50％I n ，I max ≥|I c |＞50％I n (1-4)
0A≤I′ max -I′ min ≤0.2A (1-5)
wherein I is max And the current difference of 0.2A is introduced for the maximum current of the three-phase four-wire intelligent electric energy meter according to the rule and logic relation presented under different inductive and capacitive load characteristic states, and the current difference can be adjusted in real time according to the required judgment accuracy.
It should be noted that, when rated secondary current of the current transformer in the middle is 5A, rated current I of the intelligent electric energy meter n 1.5A, rated current I of intelligent electric energy meter when rated secondary current of current transformer is 1A n 0.3A.
When at least one of the first element voltage, the second element voltage and the third element voltage does not accord with a preset voltage judgment rule, or at least one of the first element current, the second element current and the third element current does not accord with a preset current judgment rule, it is judged that the intelligent electric energy meter does not need to start fault recognition. That is, when the first element voltage U a Voltage U of second element b Voltage U of third element c At least one of the first element currents I does not satisfy the formula (1-1), or a Second element current I b Third element current I c If at least one of the formulas (1-2) to (1-5) is not satisfied, the intelligent ammeter does not need to start fault identification.
S30: when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element.
In this embodiment, under the load basic symmetrical state, inductive load and capacitive load of the three-phase four-wire intelligent electric energy meter can be accurately judged, and faults under various complex load tide states can be greatly improved in judging accuracy, wherein the faults are caused by voltage phase sequence errors, current phase errors, polarity reverse connection and the like.
Specifically, in this embodiment, when it is determined that the intelligent ammeter needs to start fault recognition based on a preset fault recognition start rule, step S30 includes:
the power factor of the intelligent electric energy meter is calculatedThe power factor of the first element +.>The power factor of the second element +.>The power factor of the third element +.>And comparing the intelligent electric energy meter with a plurality of preset ranges, and judging whether the intelligent electric energy meter fails or not according to a comparison result.
In this embodiment, the plurality of preset ranges include:
in quadrant i and iv:
first kind:
second kind:
third kind:
in quadrants II and III:
fourth kind:
fifth:
sixth:
specifically, when the power factor of the intelligent electric energy meter isThe power factor of the first element +.>The power factor of the second element +.>The power factor of the third element +.>Any one of the intelligent electric energy meter faults is judged if the intelligent electric energy meter faults do not accord with a plurality of (six) preset ranges.
In this embodiment, the determining method further includes the following step S40, as shown in fig. 3, specifically including:
s41: obtaining fault judgment results of a plurality of sampling moments;
s42: acquiring the total sampling times and judging the sampling times of faults of the intelligent electric energy meter;
s43: and when the ratio of the sampling times of the faults of the intelligent electric energy meter in the sampling total times is larger than a preset proportion value, starting fault early warning of the intelligent electric energy meter.
Specifically, in this embodiment, the sampling time of each day is 24 whole points, and the preset proportion value is 50%. And acquiring the total sampling times 24 by acquiring fault judgment results of 24 sampling moments, and triggering fault early warning of 'three-phase four-wire intelligent meter faults' if the ratio of the sampling times (more than 12) of the intelligent electric energy meter faults in the total sampling times is judged to be more than 50%.
If 96 sampling times per day are used, the preset ratio value is 50%. And acquiring the total sampling times 96 by acquiring fault judging results of 96 sampling moments, and triggering fault early warning of 'three-phase four-wire intelligent meter faults' if the ratio of the sampling times (more than 48) of the intelligent electric energy meter faults in the total sampling times is judged to be more than 50%.
According to the accuracy rate of fault judgment of the requirements, the sampling times can be adjusted according to the requirements.
For example, a 110kV special line user three-phase four-wire intelligent electric energy meter has a voltage specification of 3X 57.7/100V, a current specification of 3X 1.5 (6) A and a maximum current I max The rated secondary current of the current transformer is 5A and is 6A.
The power factors, voltages and current parameters of the intelligent electric energy meter, the first element, the second element and the third element at one sampling moment are as follows:
parameters of the intelligent electric energy meter:rated voltage U n =57.7v, rated current I n =1.5a, total active power p= 91.17W, total reactive power q= -66.46var, power factor
Parameters of the first element: voltage U a =59.1v, current I a Active power p=0.97a a = 46.96W, reactive power Q a = -32.88var, power factor
Parameters of the second element: voltage U b =59.6v, current I b Active power p=0.91A b = 49.15W, reactive power Q b = 22.92var, power factor
Parameters of the third element: voltage U c =59.7v, current I c Active power P = -0.95A c = -4.94W, reactive power Q c = -56.50var, power factor
As can be seen from the formula (1-1), U in this example a ≥0.9U n 、U b ≥0.9U n 、U c ≥0.9U n I.e. the first condition is fulfilled;
as can be seen from the formulas (1-2) to (1-5), I in this example max ≥|I a |＞50％I n ，I max ≥|I b |＞50％I n ，I max ≥|I c |＞50％I n Maximum value I 'of absolute values in three-phase current' max ＝I a Minimum value I 'of absolute value in three-phase current' min ＝I b At this time, 0.97-0.91=0.06.2A or less, satisfying the second condition;
based on a preset fault identification starting rule, the method can know that the first condition and the second condition are met at the same time, and judges that the intelligent ammeter starts fault identification.
And (3) fault identification:
according to the power factor of the intelligent electric energy meterThe power factor of the first component->The power factor of the second component->The power factor of the third element->
Knowing the power factor of intelligent ammeterThe power factor of the first component->The power factor of the second component->The power factor of the third element->And the fault of the three-phase four-wire intelligent electric energy meter of the special line user is judged because the fault does not accord with any one of the six conditions.
The phasor diagram of the three-phase four-wire intelligent electric energy meter for the special line user is shown in fig. 4, and the angles are as follows:the three-phase four-wire intelligent ammeter is wired as follows: />I.e. first element access->Second element Access->Third component access->There is a miswiring fault.
Therefore, in the above scheme, aiming at the discrimination of the faults of the three-phase four-wire intelligent electric energy meter, the power factors, the voltages and the currents of the intelligent electric energy meter and the first element, the second element and the third element in the intelligent electric energy meter are obtained, when the preset voltage discrimination rules and the preset current discrimination rules are met, the power factors of the intelligent electric energy meter and the first element, the second element and the third element in the intelligent electric energy meter are matched with various preset ranges, and whether the faults exist in the three-phase four-wire intelligent electric energy meter is judged according to the matching results. The fault judgment of the three-phase four-wire intelligent electric energy meter is not limited by the skill level of personnel, the test is not needed through an instrument and a meter, and whether the three-phase four-wire intelligent electric energy meter has faults or not can be accurately, automatically and intelligently judged through intelligent electric energy meter data.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
In an embodiment, a device for determining a fault of a three-phase four-wire intelligent ammeter is provided, where the device for determining a fault of a three-phase four-wire intelligent ammeter is in one-to-one correspondence with the method for determining a fault of a three-phase four-wire intelligent ammeter in the above embodiment. As shown in fig. 5, the device for determining a fault of the three-phase four-wire intelligent ammeter comprises an acquisition module 101, a determination module 102 and an identification module 103. The functional modules are described in detail as follows:
the acquisition module 101 is configured to acquire power factors, voltages and currents of the intelligent ammeter, the first element, the second element and the third element at a sampling moment respectively;
the judging module 102 is configured to judge whether the intelligent electric energy meter starts fault recognition based on a preset fault recognition start rule according to the voltage and current of the intelligent electric energy meter, the voltage and current of the first element, the voltage and current of the second element, and the voltage and current of the third element;
and the identification module 103 is configured to determine whether the intelligent ammeter has a fault based on a preset fault identification rule according to a power factor of the intelligent ammeter, a power factor of the first element, a power factor of the second element, and a power factor of the third element when the intelligent ammeter needs to start fault identification based on the preset fault identification rule.
Specifically, the obtaining module 101 is configured to:
parameters of the intelligent electric energy meter: rated voltage U n Rated current I n Power P, reactive power Q, power factor
Parameters of the first element: voltage U a Current I a Power P a Reactive power Q a Power factor of
Parameters of the second element: voltage U b Current I b Power P b Reactive power Q b Power factor of
Third elementIs defined by the parameters: voltage U c Current I c Power P c Reactive power Q c Power factor of
Specifically, the judging module 102 is further configured to:
when the first element voltage, the second element voltage and the third element voltage all accord with preset voltage judgment rules, and the first element current, the second element current and the third element current all accord with preset current judgment rules, judging that the intelligent electric energy meter needs to start fault identification;
when at least one of the first element voltage, the second element voltage and the third element voltage does not accord with a preset voltage judgment rule, or at least one of the first element current, the second element current and the third element current does not accord with a preset current judgment rule, it is judged that the intelligent electric energy meter does not need to start fault recognition.
Specifically, the judging module 102 is further configured to:
when the first element voltage, the second element voltage and the third element voltage all accord with a preset voltage judgment rule, and all of the first element current, the second element current and the third element current accord with a preset current judgment rule, the intelligent electric energy meter is judged to need to start fault identification, the method comprises the following steps:
when the first element voltage, the second element voltage and the third element voltage are within a preset voltage range;
and, in addition, the method comprises the steps of,
when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a preset current range, obtaining the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current according to the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current, and judging that the difference value between the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current is in a preset fault identification starting range;
and judging that the intelligent electric energy meter needs to start fault identification.
Specifically, the judging module 102 is further configured to:
comparing the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current to obtain the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current;
when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are within a first preset current range, judging that the ratio of the absolute value of the difference to the maximum value of the absolute values in the three-phase currents is within a first preset fault identification starting range,
or,
and when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a second preset current range, judging that the difference value is in a second preset fault identification starting range.
Specifically, the identification module 103 is further configured to:
comparing the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element with a plurality of preset ranges, and judging whether the intelligent electric energy meter fails or not according to a comparison result.
Specifically, the identification module 103 is further configured to:
and judging that the intelligent electric energy meter fails when any one of the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element does not accord with a plurality of preset ranges.
The device for judging the fault of the three-phase four-wire intelligent ammeter further comprises an early warning module 104, which is used for:
obtaining fault judgment results of a plurality of sampling moments;
acquiring the total sampling times and judging the sampling times of faults of the intelligent electric energy meter;
and when the ratio of the sampling times of the faults of the intelligent electric energy meter in the sampling total times is larger than a preset proportion value, starting fault early warning of the intelligent electric energy meter.
The invention provides a judging device for faults of a three-phase four-wire intelligent electric energy meter, which is characterized in that the power factors, voltages and currents of the intelligent electric energy meter and first, second and third elements in the intelligent electric energy meter are obtained, when preset voltage judging rules and preset current judging rules are met, the power factors of the intelligent electric energy meter and the first, second and third elements in the intelligent electric energy meter are matched with various preset ranges, and whether the three-phase four-wire intelligent electric energy meter has faults is judged according to the matching results. The fault judgment of the three-phase four-wire intelligent electric energy meter is not limited by the skill level of personnel, the test is not needed through an instrument and a meter, and whether the three-phase four-wire intelligent electric energy meter has faults or not can be accurately, automatically and intelligently judged through intelligent electric energy meter data.
For specific limitation of the device for determining the fault of the three-phase four-wire intelligent electric energy meter, reference may be made to the limitation of the method for determining the fault of the three-phase four-wire intelligent electric energy meter hereinabove, and the description thereof will not be repeated here. All or part of each module in the fault judging device of the three-phase four-wire intelligent electric energy meter can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes non-volatile and/or volatile storage media and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external device end through network connection. The computer program is executed by a processor to realize functions or steps of a service side of a judging method of the fault of the three-phase four-wire intelligent electric energy meter.
In one embodiment, a computer device is provided, which may be a device side, and the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is for communicating with an external server via a network connection. The computer program is executed by a processor to realize functions or steps of equipment end side of a method for judging faults of the three-phase four-wire intelligent electric energy meter.
In one embodiment, a computer device is provided comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of when executing the computer program:
respectively acquiring power factors, voltages and currents of an intelligent electric energy meter, a first element, a second element and a third element at a sampling moment;
judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current;
when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element.
Also used for realizing the following steps:
obtaining fault judgment results of a plurality of sampling moments;
acquiring the total sampling times and judging the sampling times of faults of the intelligent electric energy meter;
and when the ratio of the sampling times of the faults of the intelligent electric energy meter in the sampling total times is larger than a preset proportion value, starting fault early warning of the intelligent electric energy meter.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
respectively acquiring power factors, voltages and currents of an intelligent electric energy meter, a first element, a second element and a third element at a sampling moment;
judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current;
when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element.
Also used for realizing the following steps:
obtaining fault judgment results of a plurality of sampling moments;
acquiring the total sampling times and judging the sampling times of faults of the intelligent electric energy meter;
and when the ratio of the sampling times of the faults of the intelligent electric energy meter in the sampling total times is larger than a preset proportion value, starting fault early warning of the intelligent electric energy meter.
It should be noted that, the functions or steps that can be implemented by the computer readable storage medium or the computer device may correspond to the descriptions of the server side and the device side in the foregoing method embodiments, and are not described herein for avoiding repetition.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims (10)

1. The method for judging the faults of the three-phase four-wire intelligent electric energy meter is characterized by comprising the following steps of:
respectively acquiring power factors, voltages and currents of an intelligent electric energy meter, a first element, a second element and a third element at a sampling moment;
judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current;
when the intelligent electric energy meter is judged to need to start fault recognition based on a preset fault recognition starting rule, judging whether the intelligent electric energy meter is faulty or not based on the preset fault recognition rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element.
2. The method according to claim 1, wherein,
when judging that the intelligent electric energy meter needs to start fault identification based on a preset fault identification starting rule, judging whether the intelligent electric energy meter has a fault based on the preset fault identification rule according to the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element, and comprising the following steps:
comparing the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element with a plurality of preset ranges, and judging whether the intelligent electric energy meter fails or not according to a comparison result.
3. The method according to claim 2, wherein,
comparing the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element with a plurality of preset ranges, judging whether the intelligent electric energy meter fails according to the comparison result, and comprising the following steps:
and judging that the intelligent electric energy meter fails when any one of the power factor of the intelligent electric energy meter, the power factor of the first element, the power factor of the second element and the power factor of the third element does not accord with a plurality of preset ranges.
4. The method according to claim 1, wherein,
the judging method further comprises the following steps:
obtaining fault judgment results of a plurality of sampling moments;
acquiring the total sampling times and judging the sampling times of faults of the intelligent electric energy meter;
and when the ratio of the sampling times of the faults of the intelligent electric energy meter in the sampling total times is larger than a preset proportion value, starting fault early warning of the intelligent electric energy meter.
5. The method according to claim 1, wherein,
the determining whether the intelligent electric energy meter starts fault recognition based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current comprises the following steps:
when the first element voltage, the second element voltage and the third element voltage all accord with preset voltage judgment rules, and the first element current, the second element current and the third element current all accord with preset current judgment rules, judging that the intelligent electric energy meter needs to start fault identification;
when at least one of the first element voltage, the second element voltage and the third element voltage does not accord with a preset voltage judgment rule, or at least one of the first element current, the second element current and the third element current does not accord with a preset current judgment rule, it is judged that the intelligent electric energy meter does not need to start fault recognition.
6. The method according to claim 5, wherein,
when the first element voltage, the second element voltage and the third element voltage all accord with a preset voltage judgment rule, and the first element current, the second element current and the third element current all accord with a preset current judgment rule, the intelligent electric energy meter is judged to need to start fault identification, the method comprises the following steps:
when the first element voltage, the second element voltage and the third element voltage are within a preset voltage range;
and, in addition, the method comprises the steps of,
when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a preset current range, obtaining the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current according to the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current, and judging that the difference value between the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current is in a preset fault identification starting range;
and judging that the intelligent electric energy meter needs to start fault identification.
7. The method according to claim 6, wherein,
when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are within a preset current range, obtaining the maximum value of the absolute value of the three-phase current and the minimum value of the absolute value of the three-phase current according to the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current, and judging that the difference value between the maximum value of the absolute value of the three-phase current and the minimum value of the absolute value of the three-phase current is within a preset fault identification starting range, the method comprises the following steps:
comparing the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current to obtain the maximum value of the absolute value in the three-phase current and the minimum value of the absolute value in the three-phase current;
when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are within a first preset current range, judging that the ratio of the absolute value of the difference to the maximum value of the absolute values in the three-phase currents is within a first preset fault identification starting range,
or,
and when the absolute value of the first element current, the absolute value of the second element current and the absolute value of the third element current are in a second preset current range, judging that the difference value is in a second preset fault identification starting range.
8. A judging device of three-phase four-wire intelligent ammeter trouble, its characterized in that includes:
the acquisition module is used for respectively acquiring the power factors, the voltages and the currents of the intelligent electric energy meter, the first element, the second element and the third element at one sampling moment;
the judging module is used for judging whether the intelligent electric energy meter starts fault recognition or not based on a preset fault recognition starting rule according to the voltage and current of the intelligent electric energy meter, the first element voltage and current, the second element voltage and current and the third element voltage and current;
the intelligent ammeter fault detection module is used for judging whether the intelligent ammeter is faulty or not according to the power factor of the intelligent ammeter, the power factor of the first element, the power factor of the second element and the power factor of the third element when the intelligent ammeter is judged to be required to be started based on a preset fault detection starting rule.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method for determining a fault of a three-phase four-wire intelligent ammeter according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the method for determining a fault of a three-phase four-wire intelligent ammeter according to any one of claims 1 to 7.
CN202311501733.9A 2023-11-10 2023-11-10 Method, device, equipment and medium for judging faults of three-phase four-wire intelligent electric energy meter Pending CN117538814A (en)

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CN202311501733.9A CN117538814A (en) 2023-11-10 2023-11-10 Method, device, equipment and medium for judging faults of three-phase four-wire intelligent electric energy meter

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Application Number Priority Date Filing Date Title
CN202311501733.9A CN117538814A (en) 2023-11-10 2023-11-10 Method, device, equipment and medium for judging faults of three-phase four-wire intelligent electric energy meter

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CN117538814A true CN117538814A (en) 2024-02-09

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