技术领域technical field
本发明涉及电能表检测领域，尤其是涉及一种电子式交流电能表的检定方法。The invention relates to the field of electric energy meter detection, in particular to a verification method for an electronic AC electric energy meter.
背景技术Background technique
近些年，随着科学技术的迅猛发展，电能计量技术突飞猛进。2009年，国家电网公司发布智能电能表系列企业标准，拉开了智能电能表大范围推广应用的序幕。自2010年起，上海地区开始全面安装使用智能电能表，至今已历7年，智能电能表已完全覆盖全市范围。电子式电能表尤其是智能电能表的质量性能已大大提升，其实际运行寿命也有了长足的突破。国网上海市电力公司在电能表的采购、试验、验收、检定等过程制定了标准规范的技术要求和管理要求，并严格执行监督。在此情形下，当前按照固定周期进行到期轮换的电能表传统运行管理模式虽然比较简单，容易操作，但也凸现出许多不利之处：首先，传统模式具体实施中无视产品质量水平，临近轮换周期后不论好坏统统一刀切。现有电能表寿命一般已普遍达到10-15年以上，而轮换周期仅为6-8年，这意味着即使到达轮换周期后实际上仍然有大量在用电能表质量性能完好，如果电能表到达轮换周期后不论好坏一律更换，引发旧表拆卸处理、新表购置安装等一系列工作，大量明明质量完好的电能表被提早报废，不仅人力物力成本巨大，而且不利于节能降耗，极大浪费社会资源。In recent years, with the rapid development of science and technology, electric energy measurement technology has advanced by leaps and bounds. In 2009, the State Grid Corporation of China released the enterprise standards for the series of smart energy meters, which opened the prelude to the large-scale promotion and application of smart energy meters. Since 2010, the Shanghai area has begun to fully install and use smart energy meters. It has been 7 years since the smart energy meters have completely covered the whole city. The quality and performance of electronic energy meters, especially smart energy meters, have been greatly improved, and their actual operating life has also made great breakthroughs. State Grid Shanghai Electric Power Co., Ltd. has formulated standard technical requirements and management requirements in the process of purchasing, testing, acceptance, and verification of electric energy meters, and strictly implemented supervision. In this case, although the traditional operation and management mode of the electric energy meter that rotates due to a fixed period is relatively simple and easy to operate, it also highlights many disadvantages: First, the traditional mode ignores the product quality level in the specific implementation, and the rotation is approaching. After the cycle, no matter whether it is good or bad, it is all one size fits all. The service life of existing electric energy meters has generally reached more than 10-15 years, while the rotation cycle is only 6-8 years, which means that even after the rotation cycle is reached, there are still a large number of electric energy meters in use with good quality and performance. After the rotation cycle is reached, they will be replaced regardless of whether they are good or bad, which will lead to a series of tasks such as the dismantling of old meters and the purchase and installation of new meters. Great waste of social resources.
因此，若想节省资源，则需要通过抽样检测来判断当前大部分电能表的质量是否仍然完好，因而如何对电子式交流电能表的质量进行检定，则成为了一个亟待解决的问题。Therefore, if you want to save resources, you need to judge whether the quality of most current electric energy meters is still intact through sampling inspection. Therefore, how to verify the quality of electronic AC electric energy meters has become an urgent problem to be solved.
发明内容Contents of the invention
本发明的目的是针对上述问题提供一种电子式交流电能表的检定方法。The object of the present invention is to provide a verification method for an electronic AC electric energy meter to solve the above problems.
本发明的目的可以通过以下技术方案来实现：The purpose of the present invention can be achieved through the following technical solutions:
一种电子式交流电能表的检定方法，所述方法包括下列步骤：A method for verifying an electronic AC watt-hour meter, said method comprising the following steps:
1)对电子式交流电能表进行潜动检定；1) Creeping verification of electronic AC watt-hour meters;
2)对通过潜动检定的电子式交流电能表进行起动检定；2) Carry out start-up verification for electronic AC watt-hour meters that have passed creep-motion verification;
3)对已通过启动检定的电子式交流电能表进行相对误差检定；3) Perform relative error verification on the electronic AC watt-hour meter that has passed the start-up verification;
4)对相对误差检定在规定阈值内的电子式交流电能表进行日计时误差检定。4) Carry out daily timekeeping error verification for electronic AC watt-hour meters whose relative error verification is within the specified threshold.
所述潜动检定具体为：将电子式交流电能表接入电路中，保持电流线路不加电流，电压线路施加电压，且施加电压值为参比电压值的115％，保持相量φ满足φ＝1且输出单元所发出的脉冲不超过一个。The creep test is specifically: connecting the electronic AC watt-hour meter into the circuit, keeping the current line without adding current, applying voltage to the voltage line, and the applied voltage value is 115% of the reference voltage value, and keeping the phasor φ satisfying φ =1 and the output unit does not send more than one pulse.
所述潜动检定的最短时间Δt具体为：The shortest time Δt of the stealth test is specifically:
对于1级电子式交流电能表：For Class 1 electronic AC watt-hour meters:
对于2级电子式交流电能表：For Class 2 electronic AC watt-hour meters:
其中，C为电子式交流电能表输出单元发出的脉冲数，Un为参比电压，Imax为最大电流，m为电能表相关系数。Among them, C is the number of pulses sent by the output unit of the electronic AC watt-hour meter, Un is the reference voltage, Imax is the maximum current, and m is the correlation coefficient of the watt-hour meter.
所述起动试验具体为：保持与潜动检定相同的电压和相量，将电子式交流电能表的电流线路升高至人为规定的起动电流IQ后，在电子式交流电能表的起动时限tQ内对电能表的显示值进行连续记录。The starting test is specifically: keep the same voltage and phasor as the creep test, after the current circuit of the electronic AC watt-hour meter is raised to the artificially prescribed starting current IQ , after the starting time t of the electronic AC watt-hour meter The display value of the electric energy meter is continuously recorded inQ.
所述起动时限tQ具体为：The starting time limit tQ is specifically:
其中，C为电子式交流电能表输出单元发出的脉冲数，Un为参比电压，m为电能表相关系数。Among them, C is the pulse number sent by the output unit of the electronic AC watt-hour meter, Un is the reference voltage, and m is the correlation coefficient of the watt-hour meter.
所述相对误差检定的方法具体为：通过被检定的电子式交流电能表的输出脉冲，控制标准的电子式交流电能表进行计数，根据计数值计算得到被检定的电子式交流电能表的相对误差γ。The relative error verification method is specifically as follows: through the output pulse of the verified electronic AC electric energy meter, control the standard electronic AC electric energy meter to count, and calculate the relative error of the verified electronic AC electric energy meter according to the count value gamma.
所述相对误差γ具体为：The relative error γ is specifically:
其中，m为实测脉冲数，N为被检定的电子式交流电能表的脉冲数，C0为标准电子式交流电能表的仪表常数，CL为被检定的电子式交流电能表的仪表常数，KI和KU分别为标准电子式交流电能表的电流和电压互感器变比。Among them, m is the measured pulse number, N is the pulse number of the verified electronic AC watt-hour meter, C0 is the instrument constant of the standard electronic AC watt-hour meter, CL is the meter constant of the verified electronic AC watt-hour meter, KI and KU are the current and voltage transformer transformation ratios of the standard electronic AC watt-hour meter, respectively.
所述日计时误差检定具体为：将电子式交流电能表接入电路中，保持电压线路施加参比电压达到1h以上，通过标准时钟测试仪测试电子式交流电能表的频率输出，保持测量时间达到1min且连续测量达到5次以上，记录测量值并计算算数平均值，得到的结果作为日计时误差。The daily timing error verification is specifically as follows: connect the electronic AC watt-hour meter into the circuit, keep the reference voltage applied to the voltage circuit for more than 1 hour, test the frequency output of the electronic AC watt-hour meter through a standard clock tester, and keep the measurement time reaching 1min and continuous measurement reaches more than 5 times, record the measured value and calculate the arithmetic mean value, and the obtained result is regarded as the daily timing error.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
(1)本发明通过依次对电子式交流电能表进行潜动检定、起动检定、相对误差检定和日计时误差检定，完整、全面地实现了对电子式交流电能表的整体检定，从而可以明确电子式交流电能表的质量是否符合要求，继而可以实现对电子式交流电能表的抽样检测，节省资源和成本。(1) The present invention completely and comprehensively realizes the overall verification of the electronic AC watt-hour meter by sequentially performing creep verification, start-up verification, relative error verification and daily timing error verification on the electronic AC watt-hour meter, so that the electronic Whether the quality of the electronic AC energy meter meets the requirements, and then the sampling inspection of the electronic AC energy meter can be realized, saving resources and costs.
(2)对电子式交流电能表按照潜动检定、起动检定、相对误差检定和日计时误差检定的顺序进行依次检定，这样的检定过程可以使得检定的条件改变达到最小，即按照此顺序进行检定，每次需要改变的条件变量较小，因此可以使得检定过程较为简单，减少检定人员的工作量。(2) The electronic AC watt-hour meter is verified in sequence in the order of creep verification, starting verification, relative error verification and daily timing error verification. This verification process can minimize the change of verification conditions, that is, the verification is carried out in this order , the condition variables that need to be changed each time are small, so the verification process can be made simpler and the workload of the verification personnel can be reduced.
(3)在进行日计时误差检定时，需要保持电压线路施加参比电压达到1h以上，由于在潜动检定、起动检定和相对误差检定的过程中，均需要保持电压线路的施加参比电压，因此在进行日计时误差检定时，无需再等待过多的时长，节省了检定时间。(3) When performing daily timekeeping error verification, it is necessary to maintain the reference voltage applied to the voltage line for more than 1h. Since it is necessary to maintain the applied reference voltage of the voltage line in the process of creep verification, starting verification and relative error verification, Therefore, there is no need to wait for too much time when performing the daily timing error verification, which saves the verification time.
附图说明Description of drawings
图1为本发明的方法流程图。Fig. 1 is a flow chart of the method of the present invention.
具体实施方式detailed description
下面结合附图和具体实施例对本发明进行详细说明。本实施例以本发明技术方案为前提进行实施，给出了详细的实施方式和具体的操作过程，但本发明的保护范围不限于下述的实施例。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
本发明提出的一种电子式交流电能表的检定方法，包括下列步骤：The verification method of an electronic AC electric energy meter proposed by the present invention comprises the following steps:
1)对电子式交流电能表进行潜动检定，具体为：1) Carry out creep-motion verification for electronic AC watt-hour meters, specifically:
将电子式交流电能表接入电路中，保持电流线路不加电流，电压线路施加电压，且施加电压值为参比电压值的115％，保持相量φ满足φ＝1且输出单元所发出的脉冲不超过一个，潜动检定的最短时间Δt具体为：Connect the electronic AC watt-hour meter into the circuit, keep the current line without current, apply voltage to the voltage line, and the applied voltage value is 115% of the reference voltage value, keep the phasor φ satisfying φ=1 and the output unit sends There is no more than one pulse, and the minimum time Δt of the stealth test is specifically:
对于1级电子式交流电能表：For Class 1 electronic AC watt-hour meters:
对于2级电子式交流电能表：For Class 2 electronic AC watt-hour meters:
其中，C为电子式交流电能表输出单元发出的脉冲数，Un为参比电压，Imax为最大电流，m为电能表相关系数；Among them, C is the number of pulses sent by the output unit of the electronic AC watt-hour meter, Un is the reference voltage, Imax is the maximum current, and m is the correlation coefficient of the watt-hour meter;
2)对通过潜动检定的电子式交流电能表进行起动检定，具体为：2) Carry out start-up verification for electronic AC watt-hour meters that have passed creep-motion verification, specifically:
保持与潜动检定相同的电压和相量，将电子式交流电能表的电流线路升高至人为规定的起动电流IQ后，在电子式交流电能表的起动时限tQ内对电能表的显示值进行连续记录，起动时限tQ具体为：Keep the same voltage and phasor as the creep test, after raising the current line of the electronic AC watt-hour meter to the artificially specified starting current IQ , the display of the watt-hour meter within the starting time limit tQ of the electronic AC watt-hour meter The value is continuously recorded, and the starting time limit tQ is specifically:
其中，C为电子式交流电能表输出单元发出的脉冲数，Un为参比电压，m为电能表相关系数；Among them, C is the number of pulses sent by the output unit of the electronic AC watt-hour meter, Un is the reference voltage, and m is the correlation coefficient of the watt-hour meter;
3)对已通过启动检定的电子式交流电能表进行相对误差检定，具体为：3) Carry out relative error verification for electronic AC watt-hour meters that have passed the start-up verification, specifically:
通过被检定的电子式交流电能表的输出脉冲，控制标准的电子式交流电能表进行计数，根据计数值计算得到被检定的电子式交流电能表的相对误差γ，具体为：The standard electronic AC watt-hour meter is controlled to count by the output pulse of the verified electronic AC watt-hour meter, and the relative error γ of the verified electronic AC watt-hour meter is calculated according to the count value, specifically:
其中，m为实测脉冲数，N为被检定的电子式交流电能表的脉冲数，C0为标准电子式交流电能表的仪表常数，CL为被检定的电子式交流电能表的仪表常数，KI和KU分别为标准电子式交流电能表的电流和电压互感器变比；Among them, m is the measured pulse number, N is the pulse number of the verified electronic AC watt-hour meter, C0 is the instrument constant of the standard electronic AC watt-hour meter, CL is the meter constant of the verified electronic AC watt-hour meter, KI and KU are the current and voltage transformer ratios of the standard electronic AC watt-hour meter, respectively;
4)对相对误差检定在规定阈值内的电子式交流电能表进行日计时误差检定，具体为：将电子式交流电能表接入电路中，保持电压线路施加参比电压达到1h以上，通过标准时钟测试仪测试电子式交流电能表的频率输出，保持测量时间达到1min且连续测量达到5次以上，记录测量值并计算算数平均值，得到的结果作为日计时误差。4) Perform daily timing error verification on the electronic AC watt-hour meter whose relative error verification is within the specified threshold, specifically: connect the electronic AC watt-hour meter into the circuit, keep the reference voltage on the voltage line for more than 1h, pass the standard clock The tester tests the frequency output of the electronic AC watt-hour meter, keeps the measurement time for 1 minute and continuously measures for more than 5 times, records the measured values and calculates the arithmetic mean value, and the obtained results are taken as the daily timing error.
根据上述步骤对电子式交流电能表进行具体的检定，过程如下：According to the above steps, the electronic AC watt-hour meter is verified specifically, and the process is as follows:
首先对于使用后的电能表，应能够准确辨别必要的信息，能够准确读取电能读数。仪表的功能应符合要求。对于表壳损坏、封印破坏、接线柱无法再接线及影响检定的表，应使用替换表。First of all, for the energy meter after use, it should be able to accurately identify the necessary information and accurately read the energy readings. The function of the instrument shall meet the requirements. Replacement tables should be used for watches with damaged cases, broken seals, terminals that cannot be rewired, or that affect verification.
继而开始，潜动试验，试验时，电流线路不加电流，电压线路施加电压应为参比电压的115％，cosφ＝1，测试输出单元所发脉冲不应多于1个。Then start the creep test. During the test, no current is applied to the current line, the voltage applied to the voltage line should be 115% of the reference voltage, cosφ=1, and the pulse sent by the test output unit should not exceed 1.
潜动试验最短试验时间△t见下式：The minimum test time △t of the creep test is shown in the following formula:
1级表：Level 1 table:
2级表：Level 2 table:
其中：in:
C——电能表输出单元发出的脉冲数，imp/kWh；C——the number of pulses sent by the output unit of the electric energy meter, imp/kWh;
Un——参比电压，V；Un ——reference voltage, V;
Imax——最大电流，A；Imax - maximum current, A;
m——系数，对单相电能表，m＝1；对三相四线电能表，m＝3；m—coefficient, for single-phase watt-hour meters, m=1; for three-phase four-wire watt-hour meters, m=3;
潜动试验结束后，进行起动试验，在电压线路加参比电压Un和cosφ＝1的条件下，电流线路的电流升到表3规定的起动电流IQ后，电能表在起动时限tQ内电能表应能起动并连续记录。时限按下式确定：After the creep test is over, start the test. Under the condition of voltage line plus reference voltage Un and cosφ=1, after the current of the current line rises to the starting current IQ specified in Table 3, the electric energy meter will start at the starting time tQ The internal electric energy meter should be able to start and record continuously. The time limit is determined as follows:
式中：In the formula:
IQ——起动电流，A；IQ ——starting current, A;
起动试验结束后，开始测定基本误差，测定受检电能表基本误差过程中，在cosφ＝1条件下，电压线路加参比电压，电流线路通参比电流Ib，预热15min，按负载电流从Imax逐次减小的顺序测定基本误差。After the starting test is over, start to measure the basic error. During the process of measuring the basic error of the electric energy meter under test, under the condition of cosφ=1, add the reference voltage to the voltage line, pass the reference current Ib on the current line, preheat for 15 minutes, and press the load current The basic error was determined in decreasing order fromImax .
测定基本误差应调定的负载功率，在参比频率和参比电压下，对电能表进行使用中检查时，通常应在表1和表2规定的负载功率下测定基本误差。The load power that should be adjusted to determine the basic error, when checking the electric energy meter in use under the reference frequency and reference voltage, the basic error should usually be measured under the load power specified in Table 1 and Table 2.
表1检定单相电能表和平衡负载下的三相电能表时应调定的负载功率Table 1 The load power that should be set when verifying single-phase electric energy meters and three-phase electric energy meters under balanced loads
表2三相有功电能表分组检定时应调定的负载功率Table 2 The load power that should be set during group verification of three-phase active energy meters
具体的则是用比较法进行电能表检定，标准电能表与被检电能表都在连续工作的情况下，用被检电能表输出的脉冲控制标准电能表计数来确定被检电能表的相对误差。Specifically, the comparison method is used to verify the electric energy meter. When the standard electric energy meter and the electric energy meter to be inspected are both in continuous operation, the pulse output by the electric energy meter to be inspected is used to control the counting of the standard electric energy meter to determine the relative error of the electric energy meter to be inspected. .
被检电能表的相对误差γ(％)按下式计算。The relative error γ (%) of the tested electric energy meter is calculated according to the following formula.
式中：m——实测脉冲数；In the formula: m - measured pulse number;
m0——算定(或预置)的脉冲数，按下式计算。m0 —— Calculated (or preset) pulse number, calculated according to the following formula.
式中：N——被检电能表脉冲数；In the formula: N——the pulse number of the electric energy meter under inspection;
C0——标准表的(脉冲)仪表常数(imp/kWh)；C0 ——the (pulse) instrument constant of the standard meter (imp/kWh);
CL——被检电能表的仪表常数(imp/kWh)；CL —— the instrument constant of the electric energy meter under test (imp/kWh);
KI、KU——标准表外接的电流、电压互感器变比。当没有外接电流、电压互感器时，KI和KU都等于1。KI , KU ——The transformation ratio of current and voltage transformers externally connected to the standard meter. When there is no external current and voltage transformer, both KI and KU are equal to 1.
要适当地选择被检电能表的脉冲数N和标准表外接的互感器量程或标准表的倍率开关档，使算定(或预置)脉冲数和实测脉冲数满足表3的规定，同时每次测试时限不少于5s。It is necessary to properly select the pulse number N of the electric energy meter under test and the external transformer range of the standard meter or the multiplier switch gear of the standard meter so that the calculated (or preset) pulse number and the measured pulse number meet the requirements in Table 3, and at the same time The test time limit is not less than 5s.
表3算定(或预置)脉冲数和显示被检电能表误差的小数位数Table 3 calculates (or presets) the number of pulses and the number of decimal places showing the error of the tested electric energy meter
每一个负载功率下，至少记录两次误差测定数据，取其平均值作为实测基本误差值。如不能正确地采集被检电能表脉冲数，舍去测得的数据。若测得的相对误差等于0.8～1.2倍被检电能表的基本误差限，再进行两次测定，取各次测定数据的平均值计算相对误差。Under each load power, record the error measurement data at least twice, and take the average value as the measured basic error value. If the pulse number of the electric energy meter under test cannot be collected correctly, the measured data will be discarded. If the measured relative error is equal to 0.8 to 1.2 times the basic error limit of the watt-hour meter under test, two more measurements are made, and the relative error is calculated by taking the average value of each measurement data.
最后，对相对误差符合规定的电子式交流电能表测定日计时误差，过程为电压线路(或辅助电源线路)加参比电压1h后，用标准时钟测试仪测电能表频率输出，连续测量5次，每次测量时间为1min，取其算术平均值，判断试验结果是否满足要求。Finally, measure the daily timing error of the electronic AC watt-hour meter whose relative error meets the requirements. The process is to add the reference voltage to the voltage circuit (or auxiliary power supply circuit) for 1 hour, then measure the frequency output of the watt-hour meter with a standard clock tester, and measure 5 times continuously. , each measurement time is 1min, take the arithmetic mean value, and judge whether the test results meet the requirements.
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| CN201710256534.4ACN107085196A (en) | 2017-04-19 | 2017-04-19 | A verification method for an electronic AC watt-hour meter |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710256534.4ACN107085196A (en) | 2017-04-19 | 2017-04-19 | A verification method for an electronic AC watt-hour meter |
| Publication Number | Publication Date |
|---|---|
| CN107085196Atrue CN107085196A (en) | 2017-08-22 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710256534.4APendingCN107085196A (en) | 2017-04-19 | 2017-04-19 | A verification method for an electronic AC watt-hour meter |
| Country | Link |
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| CN (1) | CN107085196A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597017A (en)* | 2018-12-26 | 2019-04-09 | 郑州万特电气股份有限公司 | A kind of rapid detection method of intelligent electric energy meter starting and shunt running |
| CN110426669A (en)* | 2019-08-12 | 2019-11-08 | 安徽南瑞中天电力电子有限公司 | A kind of automatic screening methods of electric energy meter based on error testing |
| CN110780139A (en)* | 2019-11-13 | 2020-02-11 | 湖南省计量检测研究院 | Method for measuring working error of electric vehicle charger |
| CN114493173A (en)* | 2021-12-28 | 2022-05-13 | 国网河北省电力有限公司营销服务中心 | Verification method and device of electric energy meter |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901388A (en)* | 2014-03-26 | 2014-07-02 | 国家电网公司 | Parallel detection terminal device and detection method |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901388A (en)* | 2014-03-26 | 2014-07-02 | 国家电网公司 | Parallel detection terminal device and detection method |
| Title |
|---|
| 何叶萍: ""故障电能表检定与分析"", 《科技信息》* |
| 唐虹等: "《电子式交流电能表检定规程》", 31 March 2013, 中国质检出版社* |
| 祝小红等: "《电能计量（第二版）》", 31 August 2014, 中国电力出版社* |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597017A (en)* | 2018-12-26 | 2019-04-09 | 郑州万特电气股份有限公司 | A kind of rapid detection method of intelligent electric energy meter starting and shunt running |
| CN110426669A (en)* | 2019-08-12 | 2019-11-08 | 安徽南瑞中天电力电子有限公司 | A kind of automatic screening methods of electric energy meter based on error testing |
| CN110780139A (en)* | 2019-11-13 | 2020-02-11 | 湖南省计量检测研究院 | Method for measuring working error of electric vehicle charger |
| CN114493173A (en)* | 2021-12-28 | 2022-05-13 | 国网河北省电力有限公司营销服务中心 | Verification method and device of electric energy meter |
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| RJ01 | Rejection of invention patent application after publication | Application publication date:20170822 | |
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