How to calculate the amount of electricity in the three phase power metering box?

The voltage transformer ratio of the three-phase power metering box is 10000 100 = 100 times, which is no problem; However, the current transformer ratio is, indicating that there are two transformation ratios, one is 25 1 = 25, and the other is 50 1 = 50 Which transformation ratio you use depends on your specific usage. The technology of each manufacturer to manufacture double conversion ratio is different, some rely on the primary side to change the "series, parallel", some rely on the secondary side of the "tap", you can check the wiring diagram on the nameplate of the three-phase power metering box and compare with the actual to see which ratio is used.

If you use the 25 1 wiring method, the comprehensive multiplier of the three-phase power metering box is 25 * 100 = 2500 times;

If you use the 50 1 wiring method, the comprehensive multiplier of the three-phase power metering box is 50 * 100 = 5000 times;

If there is no current transformer, the current transformer wire is directly stringed, that is, 50 1, if you spare 2 circles (there are 2 strands in the center of the transformer), it is 25 1, and your magnification has two possibilities, either 5000 times or 2500 times.

The current transformer is 100 times, the voltage transformer is 100 times, and if you calculate the amount of electricity, of course, it is 2550 times

Actual amount of electricity (number of representations in this month, number of representations in the previous month) Current transformer rate Voltage transformer rate.

Summary. The electricity consumption of each phase is measured by three single-phase watt-hour meters, and then the electricity consumption of the motor is obtained by adding the three phases.

How to measure three-phase electricity consumption with a single-phase meter?

To measure three-phase electricity with a single-phase watt-hour meter, the practice is that three single-phase watt-hour meters are connected to each phase separately, and the readings of the three meters together are the total number of degrees of electricity consumed in the three phases. Such as a piece reading 32; The other block reads 35; There is also a piece that reads 33; Then the total degree of three-phase electricity = 32 + 35 + 33 = 100 kWh.

There is only one single-phase meter, can I measure the amount of motor used in a three-phase motor by connecting any of the three-phase lines?

The electricity consumption of each phase is measured by three single-phase watt-hour meters, and then the electricity consumption of the motor is obtained by adding the three phases.

Dear, you use a single-phase watt-hour meter to measure three-phase electricity, the practice is that three single-phase watt-hour meters are connected to each phase, and the readings of the three meters together are the total electricity consumption of the three-phase electricity. Such as a piece reading 32; The other block reads 35; There is also a piece that reads 33; Then the total degree of three-phase electricity = 32 + 35 + 33 = 100 kWh of electricity has only 1 single-phase table cracking stool. Three single-phase watt-hour meters are used to measure the electricity consumption of each source and the starting phase, and then the three phases are added together to obtain the electricity consumption of the motor.

Hope mine is helpful to you<>

Summary. Connect two single-phase meters to a single-phase three-wire system, and then add up the readings from the two meters to get the total power. A single-phase meter is connected to a three-phase three-wire system, and a current coil is connected in series on any line by using the Brondel transform principle, and a voltage coil is connected with the other two lines respectively to obtain the total power.

Three single-phase meters are connected to a three-phase four-wire system, and the readings of the three meters are added together to give the total power.

Connect two single-phase meters to a single-phase three-state excavation and dismantling system, and then add the readings of the two meters to get the total power. A single-phase meter is connected to the three-phase three-wire system, and a current coil is connected in series on any line by using the principle of Brondel transform, and a voltage coil is connected with the other two lines respectively to obtain the total power of the sail date. Three single-phase meters are connected to a three-phase four-wire system, and the readings of the three meters are added together to give the total power.

It is not accurate to use a single-phase meter to measure three-phase electricity usage, as a single-phase meter can only measure single-phase electricity.

If you need to meter your three-phase electricity usage, but only a single-phase meter is available, you can use a method called the two-meter method. This method requires you to use two single-phase electricity meters to measure the amount of three-phase electricity used, and the specific steps are as follows:1

Connect the first meter to any two phases, taking care to keep the polarity consistent. 2.Connect the second meter to the other two phases, again with the same polarity.

3.Record the readings of each meter and add them together over the years. 4.

Finally, multiply by a coefficient k, which is usually the root number 3) to obtain the actual three-phase electricity consumption. The formula is: Three-phase electricity consumption = Sum of phase A and phase B) + Sum of phase C and neutral) It is important to note that when using this method, it is important to ensure that the rating of each meter is large enough to handle all the measured loads.

In addition, since this method is not a standard measurement method, it is not suitable as a basis for formal calculations in commercial and industrial applications.

Obviously different. The first thing to say is that there is no such thing as a two-phase meter. There is only a three-phase energy meter and a single-phase energy meter.

The three-phase meter you are talking about should be a three-phase four-wire energy meter that needs to be connected to the three-phase current of Bishuhao, and the two-phase meter you are talking about should be a three-phase three-wire energy meter (or three-phase two-element energy meter) that only needs to be connected to the two-phase current. The two-phase meter you are talking about (the one starting with DS) can only be used in a three-phase three-wire system. And the terminal power distribution, especially in your hotel are used in the three-wire four-wire distribution after the lack of electricity, can only use the three-phase four-wire electric energy meter (three-phase current must be connected, the meter starting with dt) If you use a three-phase two-element electric energy meter (the meter starting with ds) to measure the electricity consumption of the three-phase four-wire system is not accurate.

There is a phase current that is not connected to the energy meter. This knowledge is something that an average electrician should know. The level of electricians in your hotel is too poor, and the electric energy meter is installed indiscriminately.

The reason why the energy meter used in the three-phase three-wire system can only be connected to the two-phase current is because the three-phase three-wire system is balanced, and the three-phase current phasor sum is zero.

Three-phase electricity is measured with a single-phase watt-hour meter.

The method is to connect three single-phase watt-hour meters to each phase, and add up the readings of the three meters to the total number of degrees of electricity you consume in the three phases. For example, if you take the manuscript block reading 32; Another piece of Naxiao reads 35; There is also a sensitive oak that reads 33; Then the total degree of three-phase electricity = 32 + 35 + 33 = 100 kWh.