CN106093831A - Rapid batch electric energy meter false actuation test method - Google Patents

Abstract

The present invention relates to a kind of fast creep test method of electric energy meters in batches. In the creep test, under a certain value voltage U, a relatively large current Im is used to pass time T1, and a counter is used to realize the time timing target, and the target electric energy consumption E1 is reached; Under the fixed value voltage U, power off, check whether the second pulse appears within a certain time T2, if it appears, it is unqualified, if it does not appear, it is qualified. The waiting time before the test and the test time of the creep test are compressed, and the verification efficiency of the batch electric energy meter is effectively improved without changing the original electric energy meter verification device. The system and method can be applied to the verification system of various manual and automatic electric energy metering devices, which is conducive to further improving the verification scheme of smart electric energy meters and meeting the meter needs of power supply units, and improving the verification management level of metering verification devices.

Description

Fast batch electric energy meter creep test method

technical field

The invention belongs to the field of electric energy metering, in particular to a fast batch electric energy meter creep test method.

Background technique

The watt-hour meter is a measuring instrument that measures the time-varying power passed by the rated voltage and the time integral.

The creep test is the accuracy test of the electric energy meter. The comparison method is usually used for the accuracy test of the electric energy meter, that is, the same power is transmitted from the power source to the standard meter and the checked meter, and the error calculator receives the output pulses of the standard meter and the checked meter and calculates the relative error of the checked meter. Both the standard meter and the tested meter have a nominal pulse constant (the number of pulses output per 1kWh of electric energy), and the pulse constant Ks of the standard meter is considered to be a real value during measurement, while the pulse constant Km of the tested meter is a nominal value. Ks is much larger than Km. The Km of the same watt-hour meter is a fixed value, so the greater the load power, the higher the pulse frequency, and the smaller the pulse interval Tp.

The creep test method of the electric energy meter is: under the condition of only applying voltage and no current, within the specified time Tno-load, the number of output pulses of the tested meter should not be greater than 1. This requirement is equivalent to the fact that the pulse interval of the tested meter is greater than Tno-load under the creep test condition. Since the power of the creep test is zero, the theoretical Tno-load is infinite, and the Tno-load needs to be sufficiently large during the test, usually exceeding 30 minutes.

With the development of the low-voltage centralized reading project of the State Grid Corporation, a large number of smart meters have been replaced, which has led to a sharp increase in the workload of smart meter verification. In order to complete the verification task and cope with the large demand for smart meters, the present invention proposes a fast batch electric energy meter creep test system and method, which improves the detection efficiency of electric energy meters by reducing the time for electric energy meter accuracy tests.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a rapid batch electric energy meter creep test method with reasonable structure, convenient use, safety and reliability, and improved efficiency.

The present invention solves its technical problem and realizes by taking the following technical solutions:

A fast batch electric energy meter creep test method, characterized in that: using a relatively large current to pass through the front part of the energy, respectively verifying that the target electric energy consumption is 1500J, 2100J, 2400J, 2700J, and then switching to the original current IQ=0.005Ib, reducing the start-up test time.

Moreover, when the number of checked watches in the same batch exceeds 30, the probability of the waiting time Tw exceeding 0.9Tstart reaches 0.96.

Moreover, the specific steps are:

(1) By installing a counter on the standard meter;

⑵Calculate under a certain value of voltage U, use a larger current Im to pass through time T1, and when the target power consumption E1 is reached, the number of pulses output by the standard meter in the value of power E1 is about Ks1;

(3) Under a certain voltage U, use a larger current Im to pass through the tested meter and the standard meter;

(4) When the counter reaches the number of pulses Ks1, switch to the test standard current I _Q under a certain voltage U until the tested meter sends out pulses;

(5) Verification end: Judgment of the verification result, if the judgment is "yes", the test is over; if the judgment result is "no", the test is not over, then repeat steps ⑴ to step 4 until the verification is over.

Advantage and positive effect of the present invention are:

The invention effectively improves the verification efficiency of the batch electric energy meter by compressing the waiting time before the test and the test time of the batch electric energy meter start-up test. And this method can be applied to the verification system of various manual and automatic electric energy metering devices, which is conducive to further improving the verification scheme of smart electric energy meters and meeting the needs of power supply units for meters, and improving the verification management level of metering verification devices.

Description of drawings

Figure 1 is the control schematic diagram of the electric energy meter accuracy test.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

A fast batch electric energy meter creep test method, the purpose of which is to reduce the verification time of the batch electric energy meter creep test. Under a certain voltage U, use a large current Im to pass through the time T1, and use the counter to achieve the time measurement goal, and reach the target power consumption E1; then under the constant voltage U, turn off the power, and verify whether there is a second one within a certain time T2 If the pulse appears, it is unqualified, and if it does not appear, it is qualified.

The specific steps are:

(1) By installing a counter on the standard meter;

⑵Batch electric energy meter start-up test and verification, calculate the number of pulses output by the standard meter in the electric energy E1 value of about Ks1 when the target electric energy consumption E1 is reached by using a relatively large current Im through the time T1 under a certain value of voltage U;

(3) Creep-moving test verification of batch electric energy meters, under a certain value of voltage U, use a relatively large current Im to pass through the tested meter and the standard meter;

⑷Basic error test verification of batch electric energy meters. When the counter counts to the number of pulses Ks1, under a certain voltage U, switch to the test standard current I _Q until the tested meter sends out pulses;

(5) Verification end: Judgment of the verification result, if the judgment is "yes", the test is over; if the judgment result is "no", the test is not over, then repeat steps ⑴ to step 4 until the verification is over.

Rationale

The accuracy test of the electric energy meter usually adopts the comparison method to carry out the accuracy test of the electric energy meter, that is, the same power is transmitted from the power source to the standard meter and the tested meter, and the error calculator receives the output pulses of the standard meter and the tested meter and calculates the output pulse of the measured meter. The relative error of the check table. Both the standard meter and the tested meter have a nominal pulse constant (the number of pulses output per 1kWh of electric energy), and the pulse constant Ks of the standard meter is considered to be a real value during measurement, while the pulse constant Km of the tested meter is a nominal value. Ks is much larger than Km. The Km of the same type of electric energy meter is basically equal, so the greater the load power, the higher the pulse frequency and the shorter the pulse interval time.

Due to the randomness of the time when the first pulse of the checked meter appears, when the number of checked meters in the same batch exceeds 30, record the waiting time as Tw. Theoretical analysis shows that the probability of Tw exceeding 0.9 is as high as 0.96. That is, generally Tw>0.9.

The electric energy consumed between two adjacent pulses of the tested meter is a fixed value, denoted as E. Assume that under a certain value voltage U, use a large current Im to pass through time T1 to reach the target power consumption E1; then under a fixed value voltage U, switch to the test standard current IQ, pass time T2 to reach the remaining part of power consumption E2. And record it under the fixed value voltage U, to reach the value of electric energy E, the standard time required to pass the pulse interval is TQ.

Then E=E1+E2=U·Im·T1+U·IQ·T2, TP=T1+T2.

Among them, E1 and Im are independent variables, and T1 can be obtained by these two values, and E2 and IQ are independent variables, and T2 can be obtained by these two values. Then the pulse interval time can be obtained. When Im>IQ, then there is TP<TQ, so as to achieve the goal of reducing the standard time TQ between pulses. Furthermore, by controlling the IQ value, T1<TW can be realized.

For example, Im=20IQ, E1=0.9E, E2=0.1E.

Then can pass E1=U·Im·T1, E=E1+E2=U·Im·T1+U·IQ·T2 and TP=T1+T2,

It is estimated that T1≈0.45·T2, ≈1.45*T2<<TQ≈10*T2, T1<TW.

Since Ks is much larger than Km, it can be seen that the pulse interval of the standard meter is much smaller than that of Km. By installing a counter on the standard meter, the number of pulses output by the standard meter in the value of electric energy E1 is about Ks1. By using a larger current to pass through the front part of the energy, when the counter counts the number of pulses Ks1, switch the current through the meter under test to achieve the purpose of counting.

Although the embodiments and drawings of the present invention are disclosed for the purpose of illustration, those skilled in the art can understand that various replacements, changes and modifications are possible without departing from the spirit and scope of the present invention. The scope of the invention is not limited to what is disclosed in the embodiments and drawings.

Claims (2)

1. A fast batch electric energy meter creep test method is characterized in that: in the creep test, under a certain value voltage U, use a larger current Im to pass through the time T1, realize the time timing target by a counter, and reach the target electric energy consumption E1; After that, under the fixed value voltage U, power off, check whether the second pulse appears within a certain time T2, if it occurs, it is unqualified, and if it does not appear, it is qualified. 2. The fast batch electric energy meter creep test method according to claim 1 is characterized in that: the specific steps are: (1) By installing a counter on the standard meter; ⑵Calculate under a certain value of voltage U, use a larger current Im to pass through time T1, and when the target power consumption E1 is reached, the number of pulses output by the standard meter in the value of power E1 is about Ks1; (3) Under a certain voltage U, use a larger current Im to pass through the tested meter and the standard meter; (4) When the counter reaches the number of pulses Ks1, switch to the test standard current I _Q under a certain voltage U until the tested meter sends out pulses; (5) Verification end: Judgment of the verification result, if the judgment is "yes", the test is over; if the judgment result is "no", the test is not over, then repeat steps ⑴ to step 4 until the verification is over.