Shenyang SIWO Electrical Equipment Co., Ltd.
Add:No.22, Puyu Road, Dadong District, Shenyang City, Liaoning Province, China
Contact us:Gu Yu
Ammeter is the short name of the energy meter, also known as the meter, fire table, energy meter, kilowatt-hour table, is a measure of power for the instrument. The most commonly used is the kilowatt hour meter. In the application of retail power, power supply companies use these meters to issue electricity bills. The meter can also record other information when using electricity, such as time.
According to the national standard GB / T15283-94 and the international standard IEC521-1988 energy meter has two current values, such as 10 ⒇ A. Here the standard 10A as the basic current (basiccurrent), the symbol is to determine the characteristics of the current value of the instrument, also known as the current value of the calibration current. The subscripts in the brackets are the rated maximum current (rated maximumcurrent), and the symbol is the maximum current value that the instrument can meet the accuracy specified by the standard. Through the energy meter current can be as high as the basic current of 2 to 8 times, less than 2 times the table only marked the basic current value. In other words, if a user installed the energy meter only marked with a current value, such as 5A, this is only the basic current value, not allowed to pass the maximum current. For this energy meter can generally be overloaded to 120% will not be a problem, but also to meet the accurate measurement of energy meter. On the other hand, the induction system energy meter due to its large resistance of the rotating mechanism, according to the standard specified starting current can not be less than 0.5% of the basic current (accuracy of the level of the energy meter), visible light meter light load to the basic current Refells to Explaint outcome Rhitheric calling calling rounds.aintithers么s.
In China, the power supply line voltage is 220V, the frequency is 50Hz, the selected power meter rated voltage and the applicable frequency should be consistent with the line voltage and frequency, it should be 220V, 50Hz.
Select the energy meter, the current value of the most important choice, but also the most complex. One is the starting current, that is, the minimum current that can rotate the turntable continuously; the second is the maximum rated current relative to the basic current multiple. In addition, the old table and the new table in terms of performance differences. (5% ~ 10%); the maximum rated current is small, generally ≤ 2, in the dial on the disk only marked a current value, and generally referred to as the current value of the old meter is still used, the starting current is relatively large, Rated current. Therefore, in the old electrical manual that the use of the load circuit current should be greater than the rated current of 10%, less than 120% or less than 125%. According to the national standard GB / T15283-94 and the international standard IEC521-1988 production of energy meter, the new residential use of the energy meter starting current is small, for the table is 0.5%; maximum rated current, the general maximum rated current For (2 ~ 4), some up to (6 ~ 8). In the new energy meter dial on the disk marked with two current values, such as 5 (20A), the choice of this energy meter on the one hand to pay attention to the minimum load current can not be lower than the starting current, that is 0.5% × ≥5A = 0. 025A; on the other hand long-term use of the ammeter value can not be higher than the maximum rated current value of 20A. Select the energy meter, should take into account the increasing number of electrical appliances into the family, to leave the margin, but also reasonable and reasonable, because the greater the number of the higher the table price.
The current value of 10 before the brackets is called the calibration current, which is used as the current value of the base load. value. According to the requirements of the program, direct access to the energy meter, the calibration current should be based on the rated maximum current and overload factor to determine, where the rated maximum current should be approved by the customer reported load capacity to determine; overload factor, the normal operation In the actual energy load current reaches the maximum rated current of more than 30%, should take 2 times the table; the actual load current is less than 30%, should take 4 times the table.
Residents with the table are generally doubled to meet the residents in a certain period of time the natural growth of the need to apply 10a with the maximum rated current 20a table, consider the residents of the electricity load with the seasonal change is relatively large, in order to accurately measure Choose 4 times the table that is 5 ⒇ a.
The above meaning is that the table of 5 ⑽a is twice as large as the maximum permissible current of 10 ⒇a and 5 ⒇a, and the maximum allowable current for the table is 10%, but the meter is more accurate when the light load is.
1,1.5 is the rated current of the meter, 6A is the rated maximum current of the table, 6 / 1.5 = 4 is the multiples of the table, referring to the table is 4 times the table.
2, the rules stipulate "by the current transformer access to the energy meter, the calibration current should not exceed the current transformer rated secondary current of 30%, the rated maximum current should be rated current secondary current of about 120% TA secondary current has been standardized to 5A, then its 30% is 1.5A, the rated maximum current value is 6A.
This is the origin of 1.5 and 6A.
3, the rules stipulate "to improve the accuracy of low load measurement, should be used to overload 4 times and above the energy meter", so 2 times and 4 times the difference is the accuracy of low load measurement. Watt-hour meter nameplate current 5-10a, 10⒇a, 5⒇a What does it mean? What's the difference?
4, the general life of the meter for 6 years, in accordance with the provisions of the state every six years to conduct a test, tuning, replacement and other steps to ensure the safety of electricity.