The influence of the 3 current transformers on the metering is different!

Under the three-phase load relative balance. If you calculate the ratio by 80 times, the measurement is small, if you calculate the ratio by 120, the measurement 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:

80 2 120 3 times).

The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is made up of a closed core and windings. Its primary side winding turns are very small, stringed in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is more, connected in series in the measuring instrument and the protection loop, when the current transformer is working, its secondary side loop is always closed, so the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to short circuit.

The current transformer converts the large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be opened.

If you can set the ratio of A, B and C phases separately in your meter, as long as it is set according to the actual CT ratio, if you can't set the ratio separately, the measured value will definitely be incorrect.

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:

80 2 120 3 times).

Obviously, the current transformer with different ratios is connected to the watt-hour meter, which will make the metering inaccurate and the error will increase.

The measurement results will be larger than the actual electricity consumption.

There must be a large error. Cannot be accurately measured.

Current transformers.

The secondary side is 5a. The ratio of a current transformer is the primary side current divided by the secondary side current. Because of the current transformer, our ammeter.

It can be made into 5a. The current relay can also be made into 5A. A current transformer is to turn a large current into a small current. The secondary components such as measurement, protection, signal, and control can achieve unified specifications.

The ratio of the current transformer above is 1200 5 240

The current transformer is to convert the large current into a small current to measure and measure, to know the actual value, the reduction of the multiple expansion, this is the transformation ratio, such as 1200 5 = 240 times, the measurement of the reduction of 240 times. For example, the ammeter of 1200 5 has been magnified 240 times on the panel scale. The electric energy meter is different, its measurement is reduced, and the actual consumption of electric energy is the expansion of the metered value of the electric energy meter by 240 times.

The transformation ratio of the current transformer is also the multiplier of the transformer, and dividing 1200 by 5 is equal to the multiplier of the transformer.

The influence of the 3 current transformers on the metering is different!

The ratio of the 3 current transformers is different, which makes the impact of metering funny! Under the three-phase load relative balance. If you calculate a ratio of 80 times, the measurement is small, if you calculate the ratio of 120, the measurement is large, and if the three-phase load is unbalanced, the error can be large or small.

There is a slight error in the meter measurement or the number of socks, and it is slightly complicated to calculate the actual electricity level.

I have three transformers, of which n two are 200 to 5, and one is 150 to 5.

1.How to calculate the electricity consumption of a 150 to 5 transformer meter: Proportional calculation, for example:

150 to 5 = 150 5 = 30, ie"Transformer meters"One word is 30 kilowatt-hours of electricity. 2.According to the number of turns marked on the nameplate of the current transformer, the corresponding variable ratio below is calculated for magnification.

Electricity consumption = meter index x multiplier. 3.The reading of a three-phase meter with a transformer is the same as that of a meter without a transformer, except that the actual power consumption of the meter using the current transformer is the difference between the meters and multiplied by the converter ratio of the transformer.

For example, an electricity meter with a transformer 200 5 shows 365 last month and 465 this month. The electricity meter shows that the monthly power consumption is 465-365 = 100 kWh, which is actually multiplied by the transformer Gaokai conversion ratio of 40 (200 5).

The actual power consumption is 100x40=4000 kWh.

There is also a transformer that is 150 to 5, what if it is calculated as 200 to 5.

Because in practice, the current of the circuit with vertical withering is too large to be represented by the conventional ammeter, so the transformer is used to form a secondary circuit, so that the original current is reduced by several times, and the conventional ammeter is still used, so that the reading displayed by the ammeter is several times smaller than the actual current, and the ratio is used to make it return to the actual current, such as 150 to 5, that is, when the reading of the ammeter is 5, it means that the actual current is 150, that is, the actual current is 30 times larger than the reading. The rest can be analog.

Two of my transformers are 200 to 5, one is 150 to 5, and the measurement is calculated according to 200 to 5.

The meter is fee-controlled, and the computer automatically reads the meter and uploads it every day.

What about people. 200 to 5 transformer it guesses that the ratio is 40. That is, when the primary coil flows through 200 amps, the secondary coil flows through 5 amps. When calculating the meter, the spike should also be multiplied by the multiplier. If the meter shows 10 degrees sensitive, the actual calculation should be 10 degrees x 40 = 400 degrees.

The calculation method of the amount of electricity charged by the transformer meter of 150 to 5: Calculated proportionally, for example: 150 is more than the imitation rent 5 = 150 5 = 30, that is"Transformer meters"One word is 30 kilowatt-hours of electricity.

The transformation ratio of the current transformer is the ratio of the primary side current to the secondary side current, such as 5, etc., such as 500 5, which means that when the primary current reaches 500A, the current induced on the secondary side is 5A, and the ratio of the two types of combustion hall is the transformation ratio.

The secondary side of the current transformer is 5A. The ratio of a current transformer is the primary side current divided by the secondary side current. Because of the current transformer, our ammeter can be made to be 5A.

The current relay can also be made into 5A. A current transformer is to turn a large current into a small current. So that the measurement, protection, signal, control and other secondary fiber components can achieve unified specifications.

The influence of the 3 current transformers on the metering is different!

Hello dear! I'm here to answer your questions, and I'm glad you asked! The influence of the 3 current transformers on the metering is different!

Under the three-phase load relative balance. If you calculate the variable ratio by 80 times, the measured value is small, if the calculated variable 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) Calculate the transformation ratio: 80 2 120 3 times) The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is made up of a closed core and windings.

Its primary side winding turns are very small, stringed in the line of the current that needs to be measured, so it often has all the current of the line flowing, the number of turns of the secondary side winding is more than the teasing, connected in series in the measuring instrument and the protection loop, when the current transformer is working, its secondary side loop is always closed, so the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to a short circuit. The current transformer converts the large current on the primary side into a small current on the secondary side for measurement, and the secondary side cannot be opened.

Summary. Under the three-phase load relative balance. If you calculate the ratio by 80 times, the measurement is small, if you calculate the ratio by 120, the measurement 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) Calculation ratio: 80 2 120 3 times).

The influence of the 3 current transformers on the metering is different!

Under the three-phase load relative balance. If you calculate the ratio of 80 times, the measured value is small, if the ratio is calculated to be 120, then the value of the rubber edge is large, and if the three-phase load is unbalanced, then the pin 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 the shirt) calculation ratio: 80 2 120 3 times).

The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is made up of a closed core and windings. The number of turns of its primary side winding is very small, and the string is in the line of the current that needs to be measured, so it often has the full let of the current flow of the line, and the number of turns of the secondary side winding is more, which is connected in series in the measuring instrument and the protection circuit, when the current transformer is working, its secondary side loop is always closed, because the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to a short circuit.

The current transformer converts the large current on the primary side into a small current on the secondary side to measure the amount of punching ridge, and the secondary side cannot be opened.

Answer]: a, b

In the current mutual inductance committee that has been made, the error is affected by: the current on the primary side is constant, the greater the virtual resistance before the total resistance of the secondary measurement, the greater the induced electromotive force on the secondary side, so the greater the magnetic flux density in the core, the core is easy to saturate After the total impedance of the secondary side is determined, the increase of the primary current will also cause the magnetic flux density in the core to increase, so the greater the primary current, the greater the secondary current error 72