Whether the energy meter has losses when there is no load

Energy meters. There is loss when there is no load.

Analysis: When the user does not use electricity, that is, there is no load current on the electric energy meter, and the current coil in the meter is without loss. But the voltage coils are connected in parallel to the phase wires in the line.

Between the neutral wire, regardless of whether the user has a load or not, it consumes electricity.

Because the wire diameter of the voltage coil is small, the number of turns is more, and the power consumption is generally within W per hour, then the monthly power consumption of the electric energy meter at no load can be calculated: W 24 h 30= kw· h

Therefore, the electric energy meter is lost in the case of no load.

After the electric energy meter is put into operation, if the user uses electricity, the electric energy meter is in working state, the current coil and the voltage coil will consume electric energy, and the electric energy meter is lost. But when the user does not use electricity, is there a loss of the energy meter?Let's break it down.

When the user does not use electricity, that is, there is no load current on the energy meter, and the current coil in the meter is not lost. However, the voltage coil is connected in parallel between the phase wire and the neutral wire in the line, and the power is consumed regardless of whether the user has a load or not. Due to the small wire diameter of the voltage coil, the number of turns is large, and the power consumption is generally within W per hour, the monthly power consumption of the electric energy meter at no load can be calculated

w× 24 h× 30= kw· h

Therefore, the electric energy meter is lossy under no load, and the monthly power consumption is about 1 kw· h.

Every piece of energy meter.

As long as it is energized, it will lose electric energy, and this loss is theoretically a fixed value and will not increase with the increase of electricity consumption. This self-depletion is not measured by the meter itself. The master meter will measure the loss of the sub-meter.

Generally, the loss of the meter itself is one to two kilowatt-hours per month. Because it only loses one to two kilowatt-hours a month, the power is quite small, and the accuracy that can be achieved by the household electric version of the energy meter is immeasurable.

The self-loss of the electric energy meter is mainly the loss of the voltage coil, taking the voltage coil of the 220V single-phase electric energy meter as an example, the loss power is about 1w, so the general single-phase electric energy meter adds one kilowatt-hour of electricity (1kwh) to the reading of the electric energy meter every month It is correct, (1w*24h*30 days =, if it is a three-phase four-wire.

The energy meter, because it has three voltage coils, the loss is about 3W.

As long as each electric energy meter is energized, it will lose electric energy, but this loss is theoretically a fixed value and will not increase with the increase of electricity consumption. This self-depletion is not measured by the meter itself. However, theoretically, the master meter will measure the loss of the sub-meter.

Generally, the loss of the meter itself is one to two kilowatt-hours per month. But because it only loses one or two kilowatt-hours a month, his power is quite small, and the accuracy that can be achieved by the current household energy meter cannot be measured. So you don't have to worry about paying for him.

However, this is for the situation that there is only one submeter, if you have a dozen or even dozens of submeters under your home, then this loss will suddenly appear. That's where the loss comes in. Can you understand what I mean, the ability to express myself is limited, hehe!

It's not going to count your money, because the meter consumes electricity, but it doesn't measure the amount of electricity you consume.

Hehe, there won't be much loss, it's basically negligible!

Reactive energy meter is specialized in calculating electrical loss, what is an active watt-hour meter and reactive energy meter Electrical energy can be converted into various energies. For example, it is converted into heat energy through electric furnaces, mechanical energy through motors, and light energy through electric lamps.

The electrical energy consumed in these conversions is both active and electrical. The meter that records this energy is an active energy meter. The principle of electrical engineering tells us that some electrical devices have to establish a conversion environment when they are used for energy conversion, such as:

Motors, transformers, etc. need to establish a magnetic field before energy conversion, and some electrical devices need to establish an electric field before energy conversion. Whereas, the electrical energy required to establish the magnetic and electric fields is reactive energy. The meter that records this energy is a reactive energy meter.

Reactive energy is not energy consumed in the electrical device itself, but it will generate reactive current in the electrical circuit, and a certain loss will be generated in the current ** circuit. The reactive energy meter is specially designed to record this loss, and generally only larger units install this kind of meter, hoping to help you.

For example, if you use 300 kWh of electricity in the current month, it will actually be calculated as 303 kWh, then the additional 3 kWh is the electricity loss, 303 300 is equal to, and then multiplied by the degree of each sub-meter is apportioned by each family. This is one of the characteristics of this industry, because the transmission of electricity will incur some additional losses in the high-voltage lines, and basically these losses will be added to each user's account in proportion.

Extended Information: The voltage drop due to line loss is related to the wire material, wire cross-section, wire length, and load current. Line Resistance Formula:

r=resistivity*l s, copper wire resistivity:, aluminum wire resistivity:, l:

Length, s: line cross-section. Voltage drop formula:

u=ri。When the current passes through the wire, there will be active power loss and reactive power loss, and the product of power loss and time is the power loss. When calculating the power loss of a transmission line, only the active energy loss of the line is calculated. The power loss of the transmission line is composed of three parts: the basic loss, the additional loss caused by the current passing through the wire, and the correction value caused by the ambient air temperature.

The formula for calculating reactive power.

1. High-voltage high-voltage high-gauge users:

Forward reactive power +|Reverse reactive power|

Among them: forward reactive power = (table word of this month - table word of last month) * multiplier reverse reactive power = (table word of this month - table word of last month) * multiplier.

Second, high-voltage undermeter users:

Forward reactive power +|Reverse reactive power - reactive copper loss - reactive iron lossThat is: the sum of the absolute values of the difference between the forward and reverse reactive power and the (reactive copper loss + reactive iron loss).

You're asking if it's transformer loss.

The no-load plus stray loss of the transformer is fixed, generally 6% of the total capacity, and the load loss is the copper loss, which should be calculated according to the load power and power factor.

Power factor calculation method for electricity meters:

Power factor = active power root number (square of active power + square of reactive power) I hope it can help you!

Reactive power needs to be measured by a reactive energy meter and cannot be calculated.

In the above case, we can estimate the reactive power as appropriate, and the algorithm is the active power multiplied by 1-power factor. For example, if the power factor is, then the reactive power is about 674400*(

Transformer Loss Sharing:

First of all, if the subcontractor uses high-voltage metering, it has included the transformer loss in the electricity consumption, and if it is low-voltage metering, the transformer loss can be divided in this way, for example, the subcontractor uses a total of 100 kWh, and your own unit uses a total of 200 kWh, and the subcontractor shares one-third of the transformer loss.

Calculation of reactive power of subcontracting unit:

You can go to the Electric Power Bureau to check the average power factor of your unit first, and then calculate the reactive power according to the electricity consumption of the subcontracting unit, the formula: power factor active power divided by (the square of the active power + the square of the reactive power is in the root number) The active power of the subcontracting unit is 674400 degrees, and the power factor is generally.

Line loss of 75 square aluminum wire:

It is related to the cross-sectional area of the aluminum wire and the length of the line, and I forgot the formula. The loss should not be too large.

If your unit transformer is 800, there should also be a basic electricity bill (if it is a temporary electricity no), generally 1KVA is 24 yuan (the basic electricity fee is different in various places), 800 * 24 19200 yuan, that is, you will be charged 19200 yuan per month, and you should also share this cost against it.

That's all, I hope it helps. Give me extra points.

The electricity consumption of the smart electric energy meter itself is not included in the loss of the public line of the power supply company, but is it included in the customer's electricity.

Hello, I'm Xinru, a workplace mentor. A smart energy meter is a high-tech meter that uses very little electricity on its own, so it is generally not counted as a customer's electricity. However, in some special cases, the smart energy meter may produce a certain amount of error in the key quantity of the measured cheat, resulting in the deviation of the customer's electricity calculation.

In addition, in the actual use process, the power supply company may verify and calibrate the measurement results of the smart rental smart watt meter to protect the rights and interests of customers. In general, a smart energy meter is a high-precision meter, which can provide more accurate electricity metering results, which is of great significance for protecting the rights and interests of customers and optimizing the operation of the power grid.

Judging from your posture, the possible reasons:

1. The old measurement of the meter section installed by others is not accurate, and the meter loss of the meter itself is very small, generally less than 3 watts, which is about 1 kilowatt-hour of electricity per month, and if the meter measurement is not accurate, it is difficult to say.

2. The installation of the meter is incorrect, if it is electromagnetic (that is, the kind with the dial rotating), the meter is not installed correctly (vertically) will cause inaccurate measurement, and there is no problem with the power supply bureau for verification, and there is no such problem in the general electronic type.

3. Stealing electricity (estimated not), that is, the power supply is not out of the meter, which is generally not under your control.

4. The maximum current (maximum power) allowed by your meter is too small, resulting in excessive load on the meter when used together, and then the meter measurement of your home is inaccurate and large!

5. My home has indeed used more electricity this month.