Direct-reading single-phase meters and three-phase meters can read numbers directly, subtracting the last reading is the amount of electricity in this phase.

Three-phase electric meter is connected via a current transformer connection, the meter has a connection wiring 10, to observe the current ratio of the current transformer connected with the brand name of the current transformer, 5 is a figure than the indicated For example, 100/5 150/5, etc., the reading of the electricity meter on the meter multiplied by the current ratio is the amount of electricity metered, plus the exact loss and line loss.

Single-phase meter measures the power of the three-phase electricity. The power reading method is a straight-in method of connecting the meter. The number on the meter reading is multiplied by 3, if the meter connected through the transformer is to read the meter number multiplied by the transformer. The current multiple is multiplied by 3.

The smart meter has only one LCD screen. If it is a single phase, it will directly display the total amount of power and the remaining battery capacity. Direct reading will do. If it is an IC card meter, only the LED display is a single card table, then there will be a small red dot on the meter. The red dot jumps to the total where it is used, and jumping to the rest is the surplus. Dual graphics card, read above or below. Three-phase prepaid meter direct in-line readings. The mutual meter reading is multiplied by the transformer magnification.