Recently, Ms. Dong, a user of Hedi Road, Yuncheng District, Yunfu City, complained to 95598. In the absence of a significant increase in electricity consumption at home, electricity consumption has doubled in the past two months. She suspects that the meter was artificially accelerated. After the on-site inspection by the power supply bureau, there was no "acceleration" in the meter. Ms. Dong later applied to the Yunfu Technical Supervision Bureau for on-site inspection. On September 10th, the verification results of the Technical Supervision Bureau of Yunfu City showed that: “All the indicators of the meter are normal, the measurement is accurate, and the relevant technical standards are met.†
The electricity bill soared, and the user’s first reaction was “impossibleâ€. It was suspected that the meter was out of order and the power supply department was also unavoidably suspected of “accelerating the meterâ€. Is it possible to speed up the meter?
statement
Power companies do "hands and feet", electricity meters go quickly
There are three kinds of statements on the Internet about the tricks of electricity meter: The first argument is that the rated current of the electric meter installed by the electric utility department for users is mostly 5A, which is equal to the current value achieved when boiled with a 1200 watt kettle. With more appliances, current usage exceeds the 5A rating, and the meter will spin at a few times the normal value. The second argument is that the civil voltage basically fluctuates within the range of 220V-237V. As long as the power company controls the voltage slightly, the increase in voltage will also make the speed of the meter faster. The third argument is that the power consumption of smart meters installed in the power sector is passed on to users. Is there any scientific basis for these arguments on the Internet?
the truth
In order to maintain accuracy, the meter has been subjected to anti-jamming experiments
An expert from the National Measurement Laboratory of the Chinese Academy of Electric Power has done an experiment: When the current is increased from 5 amps to 30 amps, it can be seen that the error is basically kept at zero-point and the error is basically unchanged. Continuing to adjust the current to a maximum of 60 amps, the meter's error is also in the tens of thousands. That is to say, in the rumor, “If the current exceeds the rated current, the meter will fly away†does not appear.
Then use the same method to test whether the voltage increase will make meter metering acceleration. At present, the civilian supply voltage is generally around 220 volts. The experts operate according to the test specification, increase the voltage by 10% to 242 volts, and observe the measurement of the meter. accuracy.
Finally, regarding the energy consumed by the smart meter itself, the expert stated that this problem was taken into account from the initial design and principle of the electricity meter and was not included in the user's electricity.
Experts stated that in fact, whether the current changes, the voltage changes, or the power consumption of the meter itself, are all items that are routinely required to be tested by the laboratory in the national standard of electric energy meters. There are also many other anti-jamming experiments. The purpose is to ensure that the meter is free from external interference and ensure the accuracy of measurement.
From this we can see that there are no factual basis for the arguments concerning the power departments in the Internet and the fact that the electricity meters are hidden inside the meter.
statement
Power companies privately require manufacturers to adjust the meter
Some time ago, "The electric meter was accelerated, the electric power company hurts the director", the article points out that the electric meters used in the market are mostly installed by the electric power company after installation. In order to obtain benefits, power companies will privately ask manufacturers to adjust the meter, and the sooner the better.
the truth
Electricity meter "home", first to go through a third party monitoring "three levels"
The reporter learned that from the production of electricity meters to the installation of households, in accordance with the regulations, third-party monitoring agencies will conduct full supervision.
Cheng Weidong, vice president of Holley Instrument Group Co., Ltd., said that, first of all, measurement products need legal measurement, must comply with relevant laws and regulations; Second, the relevant technical supervision department will fly to the company from time to time, that is, without prior notice, direct Sampling from the table in the assembly line in the assembly line or at the end of the package. The China National Accreditation Service for Conformity Assessment (CNAS), as a third party organization, will evaluate the testing environment, equipment, processes, and personnel of the metrology agencies, provide certification, and conduct “reviews†on a periodic basis. "Review" has to pass three levels.
The first pass, the manufacturer detects. Meter manufacturers have strict qualification requirements. The manufacturer of the electric energy meter according to the national technical standard, carries on the strict inspection to each electric energy meter before leaving the factory, after the examination passes the "lead seal", delivers again to the power supply department. At the same time, manufacturers will also archive relevant test data for reference in the operation of the energy meter.
The second pass, the acceptance of the meter. After the power supply department receives the supply from the manufacturer, it will perform acceptance testing on the energy meter. At the same time, the provincial measurement center will also extract a part of the meter from the meter to perform a full-scale inspection of its function and performance. The “double insurance†guarantees the quality of the energy meter. If any party finds that it does not meet the requirements of the testing standard, this shipment will all be rejected. It is reported that the "lead seal" cannot be removed or damaged during testing.
The third level, local quality supervision bureau sampling. A meter from the production to the installation of the home but also through the quality inspection designated third-party testing agencies for mandatory testing. When the Bureau of Geological Supervision in accordance with the provisions of the national measurement law, the quality of the energy meter to conduct random checks to ensure the accuracy and accuracy. So how is the so-called mandatory verification? According to relevant personnel, the quality supervision department took the two measures of random inspection in the production process and mandatory verification after leaving the factory. Before the installation, there was a third barrier: a random inspection of 10%. Even if the previous one misses, the last two passes will not go.
The meter is suspected to run fast to request testing
In order to dispel the concerns of Ms. Dong, the staff of the Power Supply Bureau went to Ms. Dong's home again to check the relevant conditions. As a result, it has been found that the user's home electric water heater has been switched on for a long time. Ms. Dong’s electricity bills for the past two months are more because the appliances have been switched on for a long time, causing them to be consumed unconsciously when they repeatedly heated the water in the tank.
The power supply department stated that if customers feel that there is a problem with the accuracy of the watt-hour meter, they may request testing from the power supply department. When the power supply department receives a question concerning the reading of the meter, it will handle it in a timely manner according to the business process and conduct on-site verification. The customer will be given a new one. Table, to ensure the normal use of electricity, and then remove the watch strap back to the test, once it is determined that the power meter failure, will promptly refund more than the collection of electricity.
In addition, customers can also send suspected suspected electric meters to third-party testing agencies, such as provincial measurement centers or local quality supervision bureaus for testing.
Literacy
The "full-body inspection" of the electricity meter has to go through seven steps
After the meter is used from the factory to the end, it will undergo many verifications. Once it fails, it will face the end of repair or scrap. The check of the meter is like a comprehensive "physical check." Let's take a look at the verification items for meter verification.
The first is to check the appearance of the meter, that is, to see whether the nameplate of the meter is clear and meets the standards, whether the case is damaged, whether the meter displays clearly, whether the basic function of the meter is normal, and whether the seal is damaged;
Secondly, the AC voltage test is, in simple terms, the test of the meter's ability to resist blows, and whether the meter can work properly after being exposed to a high voltage.
Thirdly, it is a latent test, which means that if the meter is tested under no load, will it secretly turn itself?
Fourth, start the test, mainly to detect whether the meter will not turn under the load. Electric energy metering emphasizes "fairness." It will not record more electricity once, nor will it record electricity for less.
Fifth, the basic error. Just like the table, the time of the second hand must be exactly equal to 1 second. The law of ammeter walking requires very strict precision.
Sixth, the instrument constant experiment. The main test is whether the meter constant is consistent with the mark on the meter's nameplate.
Seventh, clock time error. As many places now have time-of-use and ladder prices. Therefore, the clock date must be accurate.
Therefore, there is no scientific basis and factual basis for the speculation that "electric meters are artificially adjusted."