CN109884578B - Rapid method for testing anti-diving performance of electronic electric energy meter - Google Patents
Rapid method for testing anti-diving performance of electronic electric energy meter Download PDFInfo
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- CN109884578B CN109884578B CN201910284044.4A CN201910284044A CN109884578B CN 109884578 B CN109884578 B CN 109884578B CN 201910284044 A CN201910284044 A CN 201910284044A CN 109884578 B CN109884578 B CN 109884578B
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Abstract
A quick method for testing anti-diving performance of an electronic electric energy meter; putting the electronic electric energy meter under the power frequency magnetic field condition with the magnetic field intensity of 0.5 mT; connecting the electronic electric energy meter to the voltage of 115% UnSo that the electronic electric energy meter can work normally, and the real-time current I sampled by the metering chip of the electronic electric energy meter is read by the upper computer softwarekAnd real-time voltage Uk(ii) a If tSThe sampling times of the data are measured for the reading time of the upper computer by n bits, W is the accumulated electric quantity in the reading time, and pavgFor average power, by a first formula
And a second formula
Calculating the average power; if so:
the sneak current generated by the electronic electric energy meter in the power frequency magnetic field of 0.5mT is not enough to enable the electric energy meter to generate a pulse within 20 times of the starting time, and the sneak prevention performance of the electric energy meter is judged to be qualified; the automatic detection and mass production detection are facilitated, and a large amount of time and labor are saved.
Description
Technical Field
The invention relates to the technical field of electric energy meters, in particular to a quick method for testing anti-diving performance of an electronic electric energy meter.
Background
The metering accuracy of the electronic electric energy meter is closely related to the working environment of the electronic electric energy meter, and one main factor is a power frequency magnetic field. The electric energy meter is often in a space power frequency magnetic field due to unreasonable installation and wiring on a working site, so that the error metering is caused, extra electric energy metering is brought to a user, and the user is subjected to unnecessary fee payment.
In order to ensure that the electric energy meter can reliably work in a complicated field power frequency magnetic field environment, a new Q/GDW364-2013 specified in the state network of 2013 is added: under the condition of alternating current 0.5mT magnetic field, the voltage circuit of the electronic electric energy meter is connected with 115% Un, the current loop has no current, the 0.5mT power frequency magnetic field is applied to the position where the electric energy meter is most sensitive to the influence of the magnetic field, and the electric energy meter cannot generate more than one pulse output within 20 times of theoretical starting time. "the theoretical starting time refers to the charging time t required by the electric energy meter to generate a pulse output under the starting current condition of 0.004IbQ. The starting test time specified by the technical specification of the intelligent electric energy meter of the national grid company is
Wherein C is an electric energy meter constant; pQTo initiate power.
Taking the specification of the electronic single-phase electric energy meter as Un of 220VAC, In of 5A and meter constant C of 1200imp/kWh as an example, P is under the conditions that the power factor is 1.0 and the starting current is 0.004InQ0.004 Ib-4.4W ═ Un, then tQ13.6 minutes, namely the theoretical starting time of the electronic single-phase electric energy meter is 13.6 minutes, and the anti-potential performance test time of each electronic single-phase electric energy meter is at least 13.6 minutes by 20 minutes to 272 minutes according to the specification requirement, which is not acceptable for the batch production test of the electronic electric energy meters.
Disclosure of Invention
The application provides a quick method for testing the anti-potentiality performance of an electronic electric energy meter, which aims to solve the problem that the anti-potentiality performance of each electronic single-phase electric energy meter is too long to test according to the standard requirement in the prior art, so that the electronic electric energy meters cannot be produced in batches.
The technical purpose of the invention is realized by the following technical scheme:
a quick method for testing anti-latency performance of an electronic electric energy meter specifically comprises the following steps:
putting the electronic electric energy meter under the power frequency magnetic field condition with the magnetic field intensity of 0.5 mT;
the electronic electric energy meter is connected to the voltage of 115% Un, so that the electronic electric energy meter can normally work, and the real-time current I sampled by a metering chip of the electronic electric energy meter is read by the software of an upper computer at the momentkAnd real-time voltage Uk；
If tSThe sampling times of the data are measured for the reading time of the upper computer by n bits, W is the accumulated electric quantity in the reading time, and pavgFor average power, by a first formula
And a second formula
The average power is calculated.
If so:
the sneak current generated by the electronic electric energy meter in the power frequency magnetic field of 0.5mT is not enough to enable the electric energy meter to generate a pulse within 20 times of the starting time, and the sneak prevention performance of the electric energy meter is judged to be qualified.
The technical scheme provided by the application comprises the following beneficial technical effects:
the invention provides a rapid method for testing anti-diving performance of an electronic electric energy meter, which adopts a first formula
And a second formula
Calculating the average power;
if so:
the sneak current generated by the electronic electric energy meter in the power frequency magnetic field of 0.5mT is not enough to enable the electric energy meter to generate a pulse within 20 times of the starting time, and the sneak prevention performance of the electric energy meter is judged to be qualified; the anti-creeping performance of the electronic electric energy meter can be quickly detected in actual operation, the detection of automation and mass production is facilitated, and a large amount of time and labor cost are saved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic view of the working states of an upper computer and an electronic electric energy meter in the application;
FIG. 2 is a screenshot of a host computer in the present application;
fig. 3 is a schematic diagram of the specific steps of the overall method of the present application.
Description of reference numerals: 1. an upper computer; 2. an electronic electric energy meter; 3. 0.5mT power frequency magnetic field.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Examples
As shown In fig. 1 and fig. 2, the tool for testing the anti-latency performance of the electronic electric energy meter 2 comprises an upper computer 1 and the electronic electric energy meter 2 to be tested, which is arranged In a 0.5mT power frequency magnetic field 3, wherein the electronic electric energy meter 2 is an electronic single-phase electric energy meter with specifications of Un 220V, In 5(60) A C1200 imp/kWh 50Hz, and the upper computer 1 is connected with the electronic electric energy meter 2 through a 485 communication interface.
Referring to fig. 3, a method for quickly testing anti-latency performance of an electronic electric energy meter 2 specifically includes the following steps:
s1, placing an electronic electric energy meter 2 under the condition of a power frequency magnetic field 3 with the magnetic field intensity of 0.5 mT.
S2, the electronic electric energy meter 2 is connected to the voltage of 115% Un, so that the electronic electric energy meter 2 works normally, and at the moment, the real-time current I sampled by the metering chip of the electronic electric energy meter 2 is read through software of the upper computer 1kAnd real-time voltage Uk；
S3, if tSReading time for the upper computer 1, measuring the sampling times of data by n bits, W is the accumulated electric quantity in the reading time, and pavgFor average power, by a first formula
And a second formula
The average power is calculated.
If so:
the sneak current generated by the electronic electric energy meter 2 in the power frequency magnetic field 3 of 0.5mT is not enough to enable the electric energy meter to generate a pulse within 20 times of the starting time, and the anti-sneak performance of the electric energy meter is judged to be qualified.
Reading time t S1 minute, the number of reading n is 30, and the upper computer 1 software compares tS、n、Ik、UkSubstituting the parameters into a first formula and a second formula to automatically calculate the average power p in the reading time tSavg＝0.005W。
When the anti-latency performance test is qualified under the condition of a power factor of 1.0 and the power frequency magnetic field condition of 0.5mT under 3
The maximum average power allowed to be generated in the 0.5mT power frequency magnetic field 3 is:
thereby determining pavg＝0.005W<Pmax＝0.009W。
Comparative example
Under the condition that the power factor is 1.0, the anti-potential performance test time of each electronic single-phase electric energy meter is at least equal to the time required by the specification
The comparison of the results of the embodiment and the comparative example shows that the anti-creeping performance time of the electronic electric energy meter 2 is shortened from 272 minutes to 1 minute, the detection efficiency is greatly improved, if the anti-creeping performance of the electronic electric energy meter under a 0.5mT power frequency magnetic field 3 is detected by 1000 electric energy meters, only 1000 minutes are needed, compared with the original detection method, the required time is shortened by nearly 270 times, the detection efficiency is greatly improved, and the method can be completely suitable for automatic and mass production detection.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (1)
1. A quick method for testing anti-diving performance of an electronic electric energy meter is characterized by comprising the following steps:
the electronic electric energy meter (2) is placed under the condition of a power frequency magnetic field (3) with the magnetic field intensity of 0.5 mT;
the electronic electric energy meter (2) is connected to the voltage of 115% Un, so that the electronic electric energy meter (2) works normally, and the real-time current I sampled by the metering chip of the electronic electric energy meter (2) is read through software of the upper computer (1) at the momentkAnd real-time voltage Uk；
If tSReading time for an upper computer (1), n is the sampling frequency of the metering data, W is the accumulated electric quantity in the reading time, and pavgFor average power, by a first formula
And a second formula
The average power is calculated and,
if so:
the sneak current generated by the electronic electric energy meter (2) in the power frequency magnetic field (3) of 0.5mT is not enough to enable the electric energy meter to generate a pulse within 20 times of the starting time, and the sneak prevention performance of the electric energy meter is judged to be qualified;
wherein Un is the rated voltage of the electronic voltmeter; t is tQGenerating a pulse output time for the electronic electric energy meter; and C is the constant of the electronic electric energy meter.
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