The electrical meter is a meter specifically used to measure the cumulative value of the electrical energy at a certain period of time.Electric meters can be divided into use: power meter, powerless power meter, maximum demand meter, standard electric energy meter, compound rate of time -sharing electrical meter, prepaid electrical energy meterFormat), loss of power meter, multi -functional electric energy meter and intelligent power meter.
Electrical table selection
Mainly choose a meter with a suitable range based on the electricity environment and power consumption. Generally, the single -phase watch is 220V and 10 (40) A.20 (80) A, three -and -three -phase, three -phase and four lines and three -phase three lines.Use three -phase and three lines during high pressure, three -phase and four lines in low pressure, and the range is selected according to actual needs.
Electric table symbol
1.gb/T17215-2002GB The two letters, which are the abbreviation of the "national standard", represents that the meter has passed the national standard, 17215 is the production serial number of the meter, and 2002 represents the standard release date of the meter. 2002 represents this meter.It was released in 2002.Class 2.1 or ① level 1 represents the accuracy of electrical energy meters in level 1, which describes the accuracy of the meter count.3. The constant constant is a special value, which is used to describe a value of the relationship between non -powerless energy and the corresponding test output that describes the instrument record.If this value is the number of pulses, the constant is described by the meter-related counting of the meter with the constant value per 1,000-hour pulse (IMP/KVARH) or the lack of each pulse.4.220V220V means that the meter should be used in the electric environment with a voltage of 220V.
Electric meter reading
Family users are usually single -phase electrical tables, which are the types as follows: Households can read numbers directly, and minusing the previous reading is the power at this stage.For example, 5376 minus 5186 last month, 550 (degrees), then the practical number of this month is 550 degrees.另外电度表上会有一些电流标定，比如1.5(6)A，2.5(10)A，5(20)A，10(40)A，15(60)A，20(80)A，30(100) A, etc. What does this mean? How to understand the current labeled current? In fact, it is not difficult, such as: 15 (60) A is to allow the current through the current meterThe current is 15A and the maximum current is 60A.
Electric meter parameter
1. Voltage parameters: indicate the voltage of the applicable power supply.The single -phase voltage of my countrys low -voltage working circuit is 220V, and the three -phase voltage is 380V.The power meter of the calibration 220V is suitable for single -phase ordinary lighting circuits.The power meter with a calibration 380V is suitable for industrial and agricultural production circuits using three -phase power supply.2. current parameters: There are two current parameters of the current meter.For example, 10 (20) a, one is the calibration working current IB (10A) that reflects the measurement accuracy and start the current index, and the other is to indicate two values ??that allow the maximum current IMAX (20A) to pass when met the measurement standard requirements.If the current in the circuit exceeds the maximum current IMAX allowed, the electrical meter accounting number is not allowed or even damaged.
Working principle of electrical meter
When the electrical meter is connected to the measured circuit, the current coil and voltage coil have a cross -current current. These two interchange currents generate in the iron core, respectively.Passing the aluminum disk, induced the vortex in the aluminum disk; the vortex is rejected in the magnetic field, so that the aluminum plate can be turned (active torque) and rotates.The greater the power consumption of the load, the greater the current of the current coil, and the greater the vortexy in the aluminum disk, the greater the torque of the aluminum plate rotation.That is, the size of the torque is proportional to the power consumption of the load.The greater the power, the greater the torque, and the faster the aluminum tray rotates.When the aluminum tray is rotated, the braking torque generated by the permanent magnet is the opposite of the direction of the braking power; the size of the brake torque is proportional to the speed of the aluminum plate.The larger.When the active torque and the brake torque reaches a temporary balance, the aluminum plate will rotate at a constant speed.The electrical energy consumed by the load is directly proportional to the rotation of the aluminum plate.When the aluminum plate is rotated, the counter is driven to instruct the consumed power energy.This is the simple process of the work of the electric energy meter.
Electric meter wiring diagram
The electric meter mainly uses the voltage coil and the current coil to rotate on the turntable to generate an current.Calculating the rotation of the turntable can be further measured.The single -phase electric meter has 5 wiring end, of which two wiring end is inside the electric meter and is connected with a connector. Therefore, there are only 4 wiring ends exposed to the outside.There are two methods: the access method of the wiring end, the access method of the electrical meter, and the transformer access method.

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