Is there an error if the three phase four wire watt hour meter is not connected to the zero line

If the three-phase load balance watt-hour meter is measured correctly, as long as the three-phase load unbalanced watt-hour meter is metered, there is an error in the measurement of the three-phase four-line.

The watt-hour meter must be connected to the zero line.

1. If the load is a three-phase load, there is no error. 2。If the load is a three-phase load mixed with a single-phase match, there is an error in the measurement. 3. If the load is single-phase access to single-phase load. The table error is greater

Friends, the three-phase four-wire watt-hour meter is definitely inaccurate if it is not connected to the zero line, and sometimes it will not rotate at all.

Three-phase four-wire electric energy meter If the zero line is not connected, the following situations:

1. Three-phase voltage balance, current can be unbalanced, and the measurement of active electric energy meter is basically error-free.

2. The three-phase voltage is unbalanced (within the national standard error), and the active power measurement error is relatively large, but it basically does not affect (the electricity cost is not much less).

3. When the load power factor is too low, there is an error in the active power, which does not affect the overall situation.

4. There is only one electricity consumption in the three-phase (the coil of the other two-phase electric energy meter is open), and the electric energy meter does not rotate.

5. There are only two kinds of electricity in the three-phase (the coil of the electric energy meter in the other phase is open), and the reading of the electric energy meter is half of the actual reading, and the zero line is not connected

1. The measurement is not accurate.

2. When one of the coils of the electric energy meter is broken down or opened, the electric energy meter insurance does not work, and it is easy to cause deep damage.

The three-phase four-wire watt-hour meter is not connected to the neutral line, which will affect the measurement accuracy.

Because in the three-phase four-wire line, due to various circumstances, the line voltage will not be equal, if the three-phase four-wire watt-hour meter is not connected to the zero line, it will cause the neutral point of the watt-hour meter voltage coil to shift, so that the metering number of the watt-hour meter produces an error. The rated current of the three-phase four-wire watt-hour meter is 80A, etc.

Functions and features.

1. Measure three-phase active or reactive energy, and do not need to be adjusted for long-term work.

2. Three-phase power supply, one line (any one of the three lines of the three-phase three-wire electric energy meter) or two lines (any two of the four lines of the three-phase four-wire electric energy meter) is powered off, and the measurement accuracy is not affected.

3. Wide operating temperature range.

4. It has the function of phase failure indication or voltage indication.

5. Infrared or RS485 communication (can be added according to user requirements).

6. The word wheel counter shows the power level.

There are certain rules and regulations and operating specifications for the installation of the watt-hour meter, and it is not necessary to connect the zero line if you want to be safe.

Summary. If the three-phase four-wire electronic watt-hour meter is not connected to the zero line, the measurement is not accurate.

According to the working principle of the three-phase four-wire electronic meter, if there is no neutral line, the metering coil is only averaged in the three-phase, and the middle line balance of the zero line is missing, and the metering coil is unable to form a complete closed loop and thus affect the normal operation. When there is only one two-phase electricity, the other phase is missing, such as when using an AC welding machine, only two phases are used, which will cause the line to be unbalanced and cause the meter to be inaccurate.

The three-phase four-wire watt-hour meter is not connected to the neutral line, which will affect the measurement accuracy.

In the three-phase four-wire line, due to various circumstances, the line voltage will not be equal, if the three-phase four-wire watt-hour meter is not connected to the zero line, it will cause the neutral point of the watt-hour meter voltage coil to offset, so that the number of watt-hour meter measurement errors.

Whether the three-phase four-wire watt-hour meter is not connected to the zero line affects the metering.

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If the three-phase four-wire electronic watt-hour meter is not connected to the zero line, the measurement is not accurate. According to the working principle of the three-phase four-wire electronic meter, if there is no neutral line, the metering coil is only averaged in the three-phase, and the middle line balance of the zero line is missing, and the metering coil is unable to form a complete closed loop and thus affect the normal operation. When there is only one two-phase electricity, the other phase is missing, such as when using an AC welding machine, only two phases are used, which will cause the line to be unbalanced and cause the meter to be inaccurate. The three-phase four-wire watt-hour meter is not connected to the neutral line, which will affect the measurement accuracy.

In the three-phase four-wire line, due to various circumstances, the line voltage will not be equal, if the three-phase four-wire watt-hour meter is not connected to the zero line, it will cause the neutral point of the watt-hour meter voltage coil to shift, and the lap type will make the metering number of the watt-hour meter produce the wrong residual branch difference.

There are three voltage coils in the table, and the star is connected to 380V, and the voltage on each coil is 220V, which is the same as the effect of connecting the zero line, at this time, if the upper line of the table is out of phase, the three coils of the slow lead in the table, in addition to the lack of phase of the phase, the voltage of the other two coils is reduced to 190V, and the two-phase electricity is still working (two-phase 380V load, or a single-phase load carrying its zero line through it) will appear less worded.

Summary. 1. When the voltage is balanced, the accuracy of the zero line will not be affected, there are three voltage coils in the table, the voltage on each coil is 220V, which can be the same as the effect of connecting the zero line, if the upper line of the table is out of phase, the voltage of the three coils in the table and the other two coils will drop by 190V, and the two-phase electricity is still working, and there will be less words.

1. When the voltage is balanced, the accuracy of the zero line will not be affected, there are three voltage coils in the table, the voltage on each coil is 220V, and the effect of the zero line is the same, if the upper line of the table is out of phase, the three coils in the table, the voltage of the other two coils will drop by 190V, at this time, the two-phase electricity is still in the work code, there will be less words.

2. If the four-line electric meter is not connected to the zero line, the accuracy will be affected, because of various circumstances, the line source voltage will not be the same, if there is no zero line, it may cause the neutral point of the voltage coil to shift, and the number of meters will produce errors.

3. If you want to do it in accordance with the requirements of the specification, you need to connect the zero line, if you don't enter the zero, you can't measure accurately, because the three-phase four-wire is connected by three electric return coils, three-phase balanced load, and the leakage mu does not need to use single-phase electricity, so you don't need to connect the zero line. If the end is all three-phase load, it will not affect the metering if it is not connected to the zero line, and the electric energy meter has a single-phase load, so it must be connected to the zero line.

What is the function of the neutral line 1. The neutral line is the power circuit of the electric Ruchai bridge gas equipment, which can be used to connect the load of single-phase 220V. 2. If the load is unbalanced, the neutral line current will flow back to the neutral point, so that the voltage and phase voltage protection of the line are balanced. 3. When the insulation of the equipment is damaged, there will be a phenomenon of hitting the shell, and the short-circuit current may form a loop through the neutral line, and the impedance of the neutral line is small, so the short-term demolition current will be relatively large, and the protection device will disconnect the power supply and play the role of slag protection.

If the three-phase four-wire electronic pre-punch watt-hour meter is not connected to the zero line, the measurement is inaccurate.

According to the working principle of the three-phase four-wire electronic electric meter, if there is no zero line in Tongjuan, the metering coil is only averaged in the three-phase, and the middle line balance of the zero line is missing, and the metering coil is unable to form a complete closed loop to affect the normal operation.

When there is only one two-phase electricity, the other phase is missing, such as when using an AC welding machine, only two phases are used, which will cause the line to be unbalanced and cause the meter to be inaccurate.

Three-phase four-wire. The meter does not need to be connected to the neutral line to measure the electricity consumption.

Three-phase alternating current.

The current of the neutral line is a three-phase phase.

The vector sum of the current. Therefore, it is not necessary to measure the neutral line current, and it is sufficient to directly measure the current of the three phases of A, B and C. In this way, accurate measurement is possible.

The three-phase four-wire meter is accurate if it is not connected to the neutral line. The zero line of the three-phase four-wire meter is just a bridge line (short line) and does not enter the metering circuit of the meter.

Of course, what do you want! Do you still want to ask whether the three-phase electric meter can go without a one-phase electric meter? Let me tell you: don't worry, you won't take advantage of the public!

I believe everyone knows that electricity is an indispensable thing in daily life, because all electrical appliances in the home must be connected to the power before they can be used. So, is it okay for a three-phase four-wire meter not to be connected to the neutral line? What should I do if I am electrocuted?

Let's find out together!

Is it okay if the three-phase four-wire meter is not connected to the zero line?

No. Because the three-phase four-wire meter is equal to three single-phase meters, if there is no neutral line, it will not form a loop, and there is no way to accurately measure it in the end. Therefore, the three-phase four-wire meter must be connected to the neutral line, otherwise it will cause unnecessary trouble.

2. What should I do if I am electrocuted?

1. When you feel that you are being electrified, you should get rid of the power immediately. Because we have a lot of water in our bodies, we become conductors of electricity. When electricity enters you, you will perceive a burst of pain.

If you don't get rid of the power supply right away, the electricity will spread all over your body, eventually endangering your life.

2. When you get rid of the power supply, you should immediately go to a dry environment to check the place where you were injured. In fact, the place where the electric shock occurs is usually near the electric kettle or rice cooker, and the cause of the electric shock is because your hands are stained with water. If you feel that it is particularly difficult to breathe after an electric shock, open the window immediately to ventilate.

Because our heartbeat will become slow when we are electrocuted, which will eventually lead to a lack of oxygen, and this can be alleviated by opening the doors and windows.

3. When you are electrocuted, you can immediately drink some glucose water to replenish yourself with some energy. Because during the electric shock, the oxygen entering the lungs will slowly decrease, and fainting may occur over time.

Summary: The above introduced to you the relevant content of the three-phase four-wire meter if it is not connected to the zero line and what to do if you are electrocuted, hoping to give you some small help. If you want to explore more about three-phase four-wire meters, you can continue to lock down our Wangqing Oak station.

No. The three-phase four-wire low-voltage watt-hour meter measures the three-phase 220V voltage of the watt-hour meter, and its input voltage specification is 220 380V, that is to say, the phase voltage is 220V, and the line voltage between any two phases is 380V.

The three-phase electric energy meter is equivalent to three single-phase electric energy meters, and it cannot form a loop without a neutral line and cannot be accurately measured.

Reasons why it is necessary to connect the neutral line:

1. In order to measure accurately and reliably. The three-phase four-wire electric energy meter adopts the star connection, if there is no grounding wire, the neutral point will drift with the load, so that the voltage between the metering elements is unstable, and the metering function is not accurate.

2. Easy to use. Generally, users who install three-phase four-wire watt-hour meters not only use three-phase motors, but also generally need to use 220V voltage for lighting, so this requires a neutral line.

Safety precautions for the use of three-phase four-wire meters:

1. The three-phase watt-hour meter is inspected and qualified before leaving the factory, and it can be installed and used after sealing the lead seal of Hunger Kaihui. If it is found to be a lead-free or expired energy meter, you should ask the relevant department to re-calibrate it before installing and using it to ensure accurate metering.

3. The watt-hour meter is installed indoors, choose a dry and ventilated place, and the bottom plate of the watt-hour meter should be placed on a solid fire-resistant wall that is not easy to be shaken by moisture.

4. When the watt-hour meter is installed, the installation stipulates the phase sequence (positive sequence) and the correct wiring diagram for wiring. The wires in the access junction box should be fixed tightly to avoid poor contact of the connector and burning the junction box.

5. When using the watt-hour meter in areas with more thunderstorms, lightning protection measures need to be taken at the installation site.

6. In places where there is dirt and may damage the mechanism, the electric energy meter should be installed in the protective cabinet.

7. The load used by the three-phase watt-hour meter should be within 5% of the rated load 150%, for example: the 50A watt-hour meter can be used in the range of 2 75A.

8. Experienced electricians or professionals are required to install electric energy meters, and make sure to read the installation manual.