Power meter reversal causes and treatment methods - Database & Sql Blog Articles

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The torque of the electric power meter is related to the mutual direction of the voltage of the meter and the current coil. If the current direction of one of the coils is reversed, the torque will change direction. At this time, not only the reading but also the pointer will be hit. Bend. In order to prevent this, the “*” or “+” and “-” signs are marked next to the power terminal terminals. When wiring the power meter, the “*” terminals of the current and voltage coils should be connected to the same Polarity, to ensure that the current direction of the two coils is consistent, and from "+" to "-", this is the so-called "generator end code" of the power meter wiring.

There is also the possibility of pointer reversal when measuring with the power meter properly wired. There are two reasons for this. The first is that there is actually a Power Supply on the load side, and the load branch does not consume power but emits power: the second possibility may occur in the power measurement of the three-phase circuit, and for the load with cosφ < 0.5, the two are connected to the three phases. The power meter of the circuit must have a negative reading. In order to obtain the reading, the polarity of the voltage or current should be reversed. The polarity switch can switch the polarity switch position and add a negative in front of the reading. number.

Therefore, when measuring single-phase power, when the meter is reversed, one coil of the meter is reversed, and the measurement result can be added with a minus sign. When measuring the most three-phase power, when one power meter is reversed, the three-phase power should be two. The difference between the tables, this should be very careful.