CN114994590B - Electric energy meter with metering self-checking function and self-checking method - Google Patents
Electric energy meter with metering self-checking function and self-checking method Download PDFInfo
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- CN114994590B CN114994590B CN202210666991.1A CN202210666991A CN114994590B CN 114994590 B CN114994590 B CN 114994590B CN 202210666991 A CN202210666991 A CN 202210666991A CN 114994590 B CN114994590 B CN 114994590B
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- 238000001514 detection method Methods 0.000 claims abstract description 68
- 230000005611 electricity Effects 0.000 claims abstract description 47
- 230000002159 abnormal effect Effects 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims 2
- 230000005856 abnormality Effects 0.000 abstract description 5
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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Abstract
The invention relates to an electric energy meter with a metering self-checking function and a self-checking method, wherein the self-checking method comprises the following steps: collecting the temperature of a wire to be measured at a certain moment, recording as T1, and starting to measure the electricity consumption; when the electricity consumption reaches a set value W0, detecting the current temperature of the wire to be detected, and recording the current temperature as T2; and determining whether the electric energy meter is abnormal according to the difference between the theoretical temperature variation and the actual temperature variation, wherein the theoretical temperature variation is the temperature variation of the wire to be tested when the power consumption in the standard state reaches W0, and the actual temperature variation is T2-T1. The invention belongs to online detection, can realize automatic detection without manual triggering, and judges whether the electric energy meter is abnormal or not through temperature change, and compared with a power detection means, the electric energy meter abnormality detection device can be used for identifying and finding the electric energy meter abnormality, and has reliability.
Description
Technical Field
The invention relates to the technical field of electric meters, in particular to an electric energy meter with a metering self-checking function and a self-checking method.
Background
Once the electric energy meter is delivered to a user for use, the electric energy meter runs on site for a long time, and the user and a power supply enterprise can not check the electric energy meter under the conventional condition. If the electric energy meter fails, electricity utilization disputes which are accumulated for a long time are easily caused, so that the detection and calibration of the metering function of the electric energy meter are necessary. In the conventional detection method, current detection, voltage detection or power detection is generally performed, and whether the electric energy meter is abnormal is judged through the current, the voltage or the power. The detection mode has certain accuracy, but has the defects that for the condition of power theft behavior, for example, a power theft person can avoid the found abnormality by adjusting power, or can not judge whether the electric energy meter is abnormal or abnormal caused by power theft when the abnormality is found.
Disclosure of Invention
The invention aims to provide an electric energy meter with a metering self-checking function and a self-checking method, which can improve the accuracy of a detection result, are not influenced by the power stealing behavior, can realize automatic detection and improve the efficiency.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a self-checking method of an electric energy meter comprises the following steps:
Collecting the temperature of a wire to be measured at a certain moment, recording as T1, and starting to measure the electricity consumption;
When the electricity consumption reaches a set value W0, detecting the current temperature of the wire to be detected, and recording the current temperature as T2;
and determining whether the electric energy meter is abnormal according to the difference between the theoretical temperature variation and the actual temperature variation, wherein the theoretical temperature variation is the temperature variation of the wire to be tested when the power consumption in the standard state reaches W0, and the actual temperature variation is T2-T1.
In a further optimized scheme, the steps of collecting the temperature of the wire to be measured at a certain moment, recording as T1, and starting to measure the electricity consumption are replaced by the following steps: cooling the wire to be measured, detecting the temperature of the wire to be measured in real time, and starting to detect and meter the electricity consumption when the temperature of the wire to be measured is reduced to a set temperature value T0; the actual temperature change amount is T2-T0.
In the above scheme, the detection is not started at any time, but is started after the temperature is reduced to a certain specific temperature, so that the influence of the ambient temperature can be eliminated, and the accuracy of the detection result is higher.
In a further optimized scheme, the step of detecting the current temperature of the wire to be measured, denoted as T2, is replaced by the following steps:
When the electricity consumption reaches the set value W0, judging whether the time for the electricity consumption to reach the set value W0 is higher than the set value S0, if not, detecting the current temperature of the wire to be detected and marking as T2, and if so, abandoning the detection and not performing the treatment.
If the power consumption reaches W0 for too long, the power consumption is too small, which may be a special case of no equipment or only short power consumption, and the temperature is naturally radiated (heat dissipation) for too long, the measurement of the temperature change is inaccurate, so that the detection is abandoned under the condition, and the inaccurate detection result caused by the inaccuracy is avoided.
In a further optimized scheme, the temperature of the wire to be tested is reduced within a preset time or a preset current range, and the temperature of the wire to be tested is detected in real time.
In the scheme, detection is not performed at any time or in real time, but is performed within a set time or current range, so that inaccurate measurement results caused by unstable voltage can be avoided, the influence of voltage fluctuation can be eliminated, and the accuracy of the detection results is further improved.
In a further optimized scheme, when the abnormality of the electric energy meter is determined, an alarm prompt is sent to a designated user. In this scheme, in time send the warning suggestion after detecting the electric energy meter unusual, can remind user or ammeter company personnel to handle in time.
In a further optimized scheme, when the electric energy meter is determined to be abnormal continuously N times, an alarm prompt is sent to a designated user, and N is an integer greater than one. In this scheme, only confirm the unusual time of electric energy meter when N in succession and send the warning suggestion, can avoid from this reporting to the wrong because of single measurement error leads to for detect more accurate, effective.
On the other hand, the embodiment of the invention also provides an electric energy meter with a metering self-checking function, which comprises an electricity consumption metering unit, a wire to be measured, a processor, a temperature detection unit and a temperature detection unit, wherein the temperature detection unit is used for detecting the temperature of the wire to be measured, the temperature comprises a starting temperature T1 and an ending temperature T2, the electricity consumption metering unit is used for metering the electricity consumption of the wire to be measured, the ending temperature T2 is the temperature of the wire to be measured when the electricity consumption reaches W0, the processor determines whether the electric energy meter is abnormal or not according to the difference between the theoretical temperature variation and the actual temperature variation, the theoretical temperature variation is the temperature variation of the wire when the electricity consumption reaches W0 in a standard state, and the actual temperature variation is T2-T1.
In a further optimized scheme, the temperature reducing device is further arranged, the temperature reducing device is used for reducing the temperature of the wire to be tested until the temperature is reduced to T0, the initial temperature is T0, and the actual temperature change amount is T2-T0.
Compared with the prior art, the invention detects whether the electric energy meter is abnormal through temperature change, rather than adopting traditional power change for detection, thereby improving the reliability of detection. On the other hand, the invention can automatically detect the temperature and collect the electricity consumption, automatically judge whether the electric energy meter is abnormal according to the analysis result, belongs to online automatic detection, does not need manual off-line triggering, can improve the detection efficiency, and also provides convenience for users or electric meter companies.
Other technical advantages of the present invention will be described in the following examples.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of an electric energy meter with a metering self-checking function in an embodiment.
FIG. 2 is a flow chart of a self-checking method in an embodiment.
FIG. 3 is a flow chart of another self-checking method according to an embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The devices of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Referring to fig. 1, connection lines without arrows in fig. 1 indicate that electrical signal connection relationships exist between the connection lines with arrows, and the connection lines with arrows indicate that an object indicated by an arrow is an acting object, that is, a wire to be tested is used as the acting object to perform corresponding processing, for example, a cooling device performs cooling processing on the wire to be tested.
As shown in fig. 1, the embodiment provides an electric energy meter with a metering self-checking function, which mainly comprises an electricity consumption metering unit, a wire to be measured, a processor, a temperature detection unit and a cooling device, wherein the electricity consumption metering unit of the electricity consumption metering unit comprises a current transformer and/or a voltage transformer and is mainly used for metering the electricity consumption of the wire to be measured, the electricity consumption metering unit is used for performing electricity consumption collection of the basic function of the electric energy meter and also for performing abnormal electricity consumption detection of the electric energy meter, the cooling device is mainly used for cooling the wire to be measured, the temperature detection unit comprises a temperature sensor and is mainly used for collecting the temperature of the wire to be measured and transmitting the collected temperature data to the processor, and the processor is mainly used for determining whether the electric energy meter is abnormal or not according to the difference between the theoretical temperature change and the actual temperature change.
The main purpose of the cooling device is to reduce the temperature of the wire to be measured to a set certain temperature, which is marked as T0. In particular, the cooling device may be a fan, a semiconductor refrigerator, or the like. In order to realize the control of the cooling device, for example, the cooling is stopped when the temperature is reduced to T0, the cooling device is connected with the processor, and the processor controls the opening and closing of the cooling device.
The temperature detection unit mainly collects two temperatures of the wire to be detected, namely a starting temperature T1 and an ending temperature T2, wherein the starting temperature T1 refers to the temperature of the wire to be detected when the wire to be detected is just detected, and the ending temperature T2 refers to the temperature of the wire to be detected when the electricity consumption reaches a set value W0 from just detected. As an implementation manner, the temperature detection unit may collect the temperature of the wire to be detected in real time from the start of detection until the detection is finished (the power consumption reaches W0); as another embodiment, the temperature detection unit is triggered by the processor and only performs the acquisition at two moments, namely a start detection moment and an end detection moment.
For the initial temperature T1, t1=t0 is taken in the present embodiment, that is, the detection starts when the temperature of the wire to be measured is reduced to T0, and the electricity consumption meter unit starts to perform electricity consumption statistics (only for detection). Because of the influence of the environmental heat radiation, for the situation of consuming the same electricity consumption, if the basic temperature is higher, the temperature rises faster, if the basic temperature is lower, the temperature rises slower, and the situation that the mobile phone is much scalded than the mobile phone in winter in summer is similar to the same using mode, therefore, if the detection is started at any temperature, the detection result may be inaccurate. In this scheme, all cool down to a certain fixed temperature through heat sink to the wire that awaits measuring when detecting at every turn, the ambient temperature that detects at every turn all keeps unanimous promptly, just so can eliminate the influence of temperature difference, improves the accuracy of testing result. The purpose of the cooling down to T0 is to keep the base temperature for each detection consistent, while there is no limit to the value of the temperature in particular.
If the influence of temperature is not taken into consideration, the initial temperature T1 may not be T0, that is, the detection may be started at any temperature (at any time) without limitation of temperature.
The actual temperature change amount means a temperature change amount from the start of detection to the end of detection, i.e., T2-T1. The theoretical temperature variation is the temperature variation of the wire to be measured when the power consumption reaches W0 in a standard state, and the standard state is the metering state of a standard electric energy meter without metering error. In order to improve the accuracy of the detection result, the initial measurement temperature of the standard electric energy meter is also T0, and the theoretical temperature variation can be obtained through experiments. Comparing the theoretical temperature variation with the actual temperature variation, and if the theoretical temperature variation and the actual temperature variation have no difference or the difference is within an allowable range, the electric energy meter can be considered to have accurate measurement and no error; otherwise, if the difference between the two (including that the theoretical temperature variation is larger than the actual temperature variation and that the theoretical temperature variation is smaller than the actual temperature variation) is larger and exceeds the allowable range, the electric energy meter is considered to have metering errors, namely the electric energy meter is abnormal.
The electric energy meter preferably further comprises an alarm unit which gives an alarm prompt to a designated user when the electric energy meter is determined to be abnormal, so that corresponding processing can be performed in time, for example, the electric energy meter can be calibrated or replaced in time. The alarm unit can realize sound and light alarm, and can also be a short message cat and the like.
As shown in fig. 2, the self-checking method based on the electric energy meter shown in fig. 1 comprises the following steps:
And step 1, cooling the wire to be detected, detecting the temperature of the wire to be detected in real time, stopping cooling when the temperature of the wire to be detected is reduced to a set temperature value T0, and starting to detect and meter the electricity consumption.
And 2, detecting the current temperature of the wire to be detected when the electricity consumption reaches a set value W0, and recording the current temperature as T2.
And step 3, determining whether the electric energy meter is abnormal according to the difference between the theoretical temperature variation and the actual temperature variation, wherein the theoretical temperature variation is the temperature variation of the wire to be tested when the electricity consumption in the standard state reaches W0, and the actual temperature variation is T2-T0.
Comparing the theoretical temperature variation with the actual temperature variation, and if the theoretical temperature variation and the actual temperature variation have no difference or the difference is within an allowable range, the electric energy meter can be considered to have accurate measurement and no error; otherwise, if the difference between the two (including that the theoretical temperature variation is larger than the actual temperature variation and that the theoretical temperature variation is smaller than the actual temperature variation) is larger and exceeds the allowable range, the electric energy meter is considered to have metering errors, namely the electric energy meter is abnormal.
And step 4, if the electric energy meter is determined to be abnormal, sending an alarm prompt to the appointed user.
As mentioned above, the flow shown in fig. 2 considers the influence of temperature, and if the temperature influence is ignored, step 1 is replaced by the following steps: and collecting the temperature of the wire to be measured at a certain moment, recording as T1, and starting to measure the electricity consumption. At this time, the actual temperature change amount is T2-T1.
In theory, the self-checking method belongs to online detection, can be used for detecting at any moment, however, the electric equipment started at different time has large change, and the voltage is possibly unstable, so that inaccurate measurement can be caused. Therefore, in order to further improve the accuracy of the detection result, it is preferable to perform the temperature reduction treatment on the wire to be detected within a preset time or a preset current range, and then start the detection when the temperature is reduced to T0. For example, the temperature of the wire to be measured is reduced after 1 a.m. because the electric equipment is relatively fixed and the voltage is relatively stable, the measurement error caused by unstable voltage can be reduced or even avoided.
Referring to fig. 3, another preferred self-checking method is provided in this embodiment, which includes the steps of:
and 10, when the current time reaches the predicted time, cooling the wire to be detected, detecting the temperature of the wire to be detected in real time, stopping cooling when the temperature of the wire to be detected is reduced to a set temperature value T0, and starting to detect and meter the electricity consumption.
And 20, when the electricity consumption reaches a set value W0, judging whether the time for the electricity consumption to reach the W0 is higher than the set value S0, if not, detecting the current temperature of the wire to be detected and marking as T2, and if so, abandoning the detection and not performing the treatment. That is, when the time taken for the power consumption to reach W0 is higher than the set value S0, the detection is ended and the next detection is waited for.
That is, if the time taken for the power consumption to reach W0 is too long, exceeding the set value, the detection is abandoned and the next detection is waited. Because the time is too long, the heat generated in the process can be gradually dissipated, and then the temperature variation is very small when the power consumption reaches WO, even the situation of negative variation (the ending temperature is smaller than the initial temperature) appears, the situation is obviously not in line with the normal situation, and therefore the detection is abandoned at the moment, and the accuracy of the detection result at each time can be ensured.
And step 30, determining whether the electric energy meter is abnormal according to the difference between the theoretical temperature variation and the actual temperature variation, wherein the theoretical temperature variation is the temperature variation of the wire to be tested when the power consumption in the standard state reaches W0, and the actual temperature variation is T2-T0.
And step 40, judging whether the electric energy meter is abnormal or not continuously determined N times (integer larger than 1), if so, sending an alarm prompt to a designated user, and if not, ending the detection, and waiting for the time to carry out the next detection.
In the step, false alarm caused by inaccurate single detection result can be avoided through multiple times of detection, and then the detection effectiveness and reliability are improved.
The method is further improved based on the method shown in fig. 2, so for the description omitted, please refer to the related description of the method shown in fig. 2, and the description is omitted here.
The invention detects the accuracy of the metering function through temperature change, breaks through the traditional detection mode, and supposedly has the electricity stealing behavior, the electricity stealing person cannot know when to perform cooling treatment and cannot determine the degree of cooling, namely the electricity stealing person cannot hide the electricity stealing behavior through avoiding means, so that the invention has high detection result accuracy and is not influenced by the electricity stealing behavior. Meanwhile, the invention belongs to online detection, can automatically detect after setting detection time or conditions, does not need to detect in a mode of triggering by a key or taking down an ammeter and the like on site, and improves detection efficiency.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The self-checking method of the electric energy meter is characterized by comprising the following steps:
Collecting the temperature of a wire to be measured at a certain moment, recording as T1, and starting to measure the electricity consumption;
When the electricity consumption reaches a set value W0, detecting the current temperature of the wire to be detected, and recording the current temperature as T2;
determining whether the electric energy meter is abnormal or not according to the difference between the theoretical temperature variation and the actual temperature variation, wherein the theoretical temperature variation is the temperature variation of the wire to be tested when the electricity consumption in the standard state reaches W0, and the actual temperature variation is T2-T1;
The step of collecting the temperature of the wire to be measured at a certain moment, which is marked as T1, and starting to measure the electricity consumption is replaced by the following steps:
cooling the wire to be measured, detecting the temperature of the wire to be measured in real time, and starting to detect and meter the electricity consumption when the temperature of the wire to be measured is reduced to a set temperature value T0;
the actual temperature variation is T2-T0;
And when the electricity consumption reaches a set value W0, detecting the current temperature of the wire to be detected, and marking as T2, wherein the following steps are replaced by the following steps:
When the electricity consumption reaches the set value W0, judging whether the time for the electricity consumption to reach the set value W0 is higher than the set value S0, if not, detecting the current temperature of the wire to be detected and marking as T2, and if so, abandoning the detection and not performing the treatment.
2. The self-checking method of an electric energy meter according to claim 1, wherein the temperature of the wire to be tested is reduced in a preset time or a preset current range, and the temperature of the wire to be tested is detected in real time.
3. The self-test method of an electric energy meter according to any one of claims 1 to 2, wherein when it is determined that the electric energy meter is abnormal, an alarm prompt is issued to a specified user.
4. The self-test method of an electric energy meter according to any one of claims 1 to 2, wherein when the electric energy meter is determined to be abnormal N times in succession, an alarm prompt is sent to a specified user, N being an integer greater than one.
5. The utility model provides an electric energy meter with measurement self-checking function, includes power consumption metering unit, wire and the treater that awaits measuring, its characterized in that still includes temperature detection unit, temperature detection unit is used for detecting the temperature of wire that awaits measuring, the temperature includes initial temperature T1 and end temperature T2, power consumption metering unit is used for measuring the power consumption of wire that awaits measuring, end temperature T2 is the temperature of wire that awaits measuring when the power consumption reaches W0, the treater confirms whether the electric energy meter is unusual according to the difference between theoretical temperature variation and the actual temperature variation, the theoretical temperature variation is the temperature variation of wire when the power consumption reaches W0 under the standard state, actual temperature variation is T2-T1.
6. The electric energy meter with the metering self-checking function according to claim 5, further comprising a cooling device, wherein the cooling device cools the wire to be tested until the temperature is reduced to T0, the initial temperature is T0, and the actual temperature change is T2-T0.
7. The electric energy meter with metering self-checking function according to claim 6, further comprising an alarm unit for giving an alarm prompt to a designated user when it is determined that the electric energy meter is abnormal.
8. The electric energy meter with metering self-checking function according to claim 5, wherein the electricity consumption metering unit comprises a current transformer and/or a voltage transformer.
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