Correct installation of a three phase four wire meter with a current transformer of the same rate?

First of all, the question can be said like this: those who are difficult will not, and those who will will not be difficult!

1. Make sure that the transformation ratio of the current transformer is the same;

2. The direction of the current transformer should be correct, and the power supply should be from the P1 side to the P2 side;

3. The number of turns must be correct, and the number of turns must be correct according to the nameplate of the transformer;

4. Then there is the wiring problem: after the three phase wires and one neutral wire are correctly connected, then connect the secondary line of the current transformer, K1 into the meter, K2 out of the meter, the transformer must correspond to the phase wire! K2 should be grounded!

K1 and K2 will run backwards when connected to the meter, if one phase is reversed, and the other two phases are running, the meter is still running, but in the three-phase equilibrium state, it should theoretically run less than 2 3 power. Think about it!

1: Of course, the wrong wiring of the current transformer will of course be metered.

2: The current should pass through the transformer P1, of course, the wiring should also be from the A-B-C-phase, one phase and one phase.

Come. K1 of a mutual inductor is connected to the first terminal of the meter, and then a power cord is connected from the outlet end of the switch A to the second terminal of the meter, and the K2 of the transformer is connected to the third terminal of the meter, and finally the ground wire is connected. Phase B and phase C are also connected in this way.

3: The last terminal of the meter is terminated with the neutral line, and it is done.

It will cause measurement errors, such as three-phase may burn the meter.

What is the model of your transformer, single-phase or three-phase, if it is a single-phase wiring error, it may cause a measurement error, if it is a three-phase connection, it will not be metered wrong.

Three-phase four-wire. through a current transformer.

Later, the wire is passed through the transformer again, so that the watt-hour meter.

It will also measure the power drops!

Current transformer wiring diagram.

At this time, the amount of electricity can be directly multiplied by the meter count and the transformer rate!

If the power cord passes through the transformer and then passes through the transformer again, the calculation of the amount of electricity is the meter count multiplied by half of the current transformer rate!

For example, when the current transformer only passes through one line, if the current transformer multiplier is 100 5A, the amount of electricity is equal to the meter count multiplied by 100 5!

The same current transformer multiplier is 100 5A, if the power line passes through the transformer again, the amount of electricity is equal to the meter count multiplied by (current transformer multiplier 2)!

Measure. As long as the power cord passes through the transformer and does not leave the transformer, as long as the electricity is used, the transformer will measure the electricity consumption.

Not metered. It is equivalent to the end of the thread where you insert the segment without load. However, this approach can be seen at a glance by a discerning person.

It will not be metered, and there is no current in the second flow of each other.

For the through-center current transformer, according to the need, a wire can be passed through the transformer, or it can be worn back and forth again, both of which are a kind of wiring that is correctly metered, but the ratio of the two is different. The ratio of the latter is half that of the former.

The degree read by the watt-hour meter (this month's reading, the previous month's reading), multiplied by the current transformer rate, is the actual power consumption of the month. If the change ratio is 200 5, it is 40 times, and the meter reading * 40 is the actual electricity consumption.

The "converter ratio" of the current transformer is the same as that of the current transformer.

The ratio of the number of turns of the first and second turns is related. When the "number of turns is 2", the current transformer of 200 5 becomes 100 5, and the magnification changes from 40 times to 20 times. The converter ratio on the nameplate of the current transformer, divided by the primary and secondary phases, is the rate of the current transformer.

Summary. This is a transformer for metering, and another transformer for ammetering. The degree of the watt-hour meter is the ratio of the transformer (only the transformer of the watt-hour meter, not the transformer of another one-watt-hour meter).

A three-phase four-wire meter, each phase is connected to two current transformers, how to calculate the electricity.

This is a transformer for metering, and another transformer for ammetering. The degree of the watt-hour meter is the ratio of the transformer (only the transformer of the watt-hour meter, not the transformer of another one-watt-hour meter).

The wire comes out of the circuit breaker and goes into the 200 5 current transformer into the meter, and out of the meter it wears another transformer of the same size, so that there is no impact on the calculation, thank you.

That's a turn. If you look at the name brand of the transformer, there is generally a multiplier ratio of how many turns it is worn. If it is 200 to 5 when wearing a turn, then one kilowatt-hour of electricity in the watt-hour meter is 40 kilowatt-hours of electricity.

Both are straight through.

Straight through? Don't go around in circles?

Do not wrap around, a 9o square straight through 2.

Is it also 40 times? Thank you.

Hello. In the, the straight through has little impact.

Hello! We're happy to answer for you! Yes.

If the three-phase meter does not have a transformer and the line enters the transformer, it is necessary to adjust the magnification of the meter according to the ratio of the transformer to accurately measure the current and energy. In this case, the reading displayed by the meter is not the actual power consumption value, but the value after the transformer ratio correction. Let's take an example:

Assuming that the rated current of a three-phase meter is 5A, and the transformer ratio used in the incoming line is 1:100, the magnification of the meter needs to be set to 100 when connecting to the meter. This effectively amplifies the meter readings by a factor of 100 to match the transformer ratio and obtain correct energy metering results.

It should be noted that the incoming transformer still needs to be calibrated and inspected with reference to specific measurement criteria and verification standards to ensure the accuracy and stability of electric energy measurement. Moreover, in practical application, attention should also be paid to the selection of transformers, meters and supporting equipment that meet the requirements to ensure the safety, reliability and accuracy of the electrical measurement system.

Hello, if the three-phase meter does not have a transformer but the incoming line is too respectful key transformer, then according to the working principle of the energy meter, the indication of the meter should need to be multiplied by the ratio of the transformer to get the correct power reading. A transformer is a device that realizes the measurement of electrical energy through proportional conversion of voltage and current, while the electricity meter calculates the amount of electricity by measuring the value of voltage and current. Therefore, if the incoming line passes through the transformer, the meter needs to be multiplied by the transformer ratio to get the correct fuel gauge.

If the variable ratio factor is not taken into account, the meter reading will be lower than the actual electricity consumption, which will lead to inaccurate electricity bill calculations. It should be noted that if you are calculating the cost of electricity instead of taking a measurement for detection, then it should be calculated based on the actual electricity consumption, without considering the variable factor. In such cases, the utility company will usually set up a billing meter specifically to measure actual electricity consumption, rather than using a regular meter.

Summary. What if you install three transformers with different magnifications on a three-phase four-wire smart meter that can be equipped with a transformer? Hello dear, under the three-phase load relative balance.

If you calculate the variation ratio by a factor of 80, the measurement is on the small side; If the calculation ratio is 120, the measured value is large, and if the three-phase load is unbalanced, the error can be large or small. There may be a slight error in the metering, and the calculation of the actual electricity is slightly complicated. 400 5 80 (times); 600 5 120 (times); Rational calculation of the change ratio:

What if you install three transformers with different magnifications on a three-phase four-wire smart meter that can be equipped with a transformer? Hello dear, under the three-phase load relative balance. If you calculate the variation ratio by a factor of 80, the measurement is on the small side; If the calculation ratio is 120, the measured value is large from the previous foot, and if the three-phase load is unbalanced, the error can be large or small.

There may be a slight error in the metering, and the calculation of the actual electricity is slightly complicated. 400 5 80 (times); 600 5 120 (times); Rational calculation becomes wisdom answer high ratio: 80 2 120 3 times) I hope to help you.

I wish you good health and a happy life!

Hello dear, the three-phase current transformer rate should be the same, otherwise the meter measurement will be inaccurate. I hope I can help you. I wish you good health and a happy life!