summary:Tianyang BrandHow many household meters A suitable?How big a meter should be installed in the home?The rated current of the general household electricity meter should not be greater than10install.Below, we will introduce the capacity selection and installation of household meter.
How much does it take to install the household meter? How to choose the capacity of the household meter?
How much is the average household meter
TianyangSelection of meter capacity: Select the capacity of the meter should be 20% of the rated current of the meter. ~120%Between, single phase220VLighting installation per kilowatt5An, three phases380VPower electricity per kilovolt1.5An or2It is advisable to calculate.
The magnitude of the current of the electricity meter: The rated current of the electricity meter for general households should not be greater than 10 am.This is because:
1. The starting current of the meter is in the power factor1At about the rated current0.5~1%，So one10AThe electricity meter must have0.05~0.1AThe current starts to rotate when it passes,220VThe power on the line is equivalent to12~24watt.Although an electric meter is a precision instrument, there is still unavoidable mechanical resistance when rotating.When starting to rotate, the accuracy of the meter is not high because the original torque is not much different from the mechanical resistance.
2. A calibrated meter can only ensure that the current is at the rated voltage.10~100%Within the range, the power factor is0.5~1When its error does not exceed1~2%。That is to say one10AThe meter can only be at the load110~2200Only by watt-hours can the purpose of accurate measurement be achieved.At present, the power wattage of ordinary households does not exceed this range. If the nameplate current of the meter exceeds the current of the meter10AAt that time, the purpose of measurement standards cannot be met, so it is not suitable to use it.
How to choose the capacity of a household meter
Installation of the meter:
1. The meter should be installed on a wall or switch board that is not easily affected by vibration, and should be located at the ground level.1.7~2Between the rice;
2. The place where the meter is installed should be clean, dry, and no strong magnetic field, and should be placed in a clear place for reading and monitoring;
3. In places that are susceptible to mechanical damage, dirt and easy to touch, the meter should be installed in the box;
4. The meter should be installed vertically, and the allowable deviation should not exceed2°；
Power-on check: Power-on check whether the power meter is working properly.If there are abnormal phenomena such as non-reversal, reversal and excessive error, the cause should be analyzed and eliminated.Most of the causes of these failures are wiring errors.The reason for the inversion is that in addition to the reverse polarity of the voltage and current coils and the reverse polarity of the current and voltage transformers, it may also be due to abnormal load.For example, in the load of a three-phase active meter, when a motor with a larger capacity is overspeeded, the motor becomes a generator to run, and the active meter will reverse.Calculate and verify the operation of the meter: After the meter is put into use for a period of time, it should be calculated and checked.Sometimes, although the wiring is incorrect, it is difficult to observe from the operating state of the meter alone. This requires calculation based on the load's power, power factors and working time, and the calculation results are compared with the meter readings to confirm the reliable operation of the meter.
