How to make the load of the high voltage metering three phase three wire electric energy meter belt

The reading of the high-voltage metering meter is calculated by the meter number * magnification = electricity.

The voltage transformer is generally 10000:100=100 and the current transformer 30:5=6 (the current on the high-voltage side is small).

Magnification = 100 * 6 = 600

In the case of normal meters and transformers, there are only multi-contact appliances to go.

When the electric energy meter is connected to the circuit under test, there is alternating current flowing through the current coil and the voltage coil, and the two alternating currents produce alternating magnetic flux in their cores respectively; The alternating magnetic flux passes through the aluminum disc and induces eddy currents in the aluminum disk; The eddy current, in turn, is subjected to force in the magnetic field, which causes the aluminum disc to obtain torque (active torque) and rotate. The greater the power consumed by the load, the greater the current through the current coil, and the greater the eddy current induced in the aluminum disc, the greater the torque that makes the aluminum disc rotate. That is, the magnitude of the torque is proportional to the power consumed by the load.

The higher the power, the greater the torque, and the faster the aluminum disc will rotate. When the aluminum disc rotates, it is affected by the braking torque generated by the permanent magnet, and the braking torque is opposite to the direction of the active torque; The size of the braking torque is directly proportional to the speed of the aluminum disc, and the faster the aluminum disc rotates, the greater the braking torque. When the active torque and the braking torque reach a temporary balance, the aluminum disc will rotate at a constant speed.

The electrical energy consumed by the load is directly proportional to the number of revolutions of the aluminum disc. When the aluminum disc rotates, the counter is driven to indicate the electrical energy consumed. This is the simple process of working with an energy meter.

Look at the model should be generated by Jiangsu Linyang,As for the reading degree,The table should be a liquid crystal display,The items often displayed on the LCD should be the total power,There are buttons on the table,You can read the power of the previous month and the previous month。

You can also use RS485 communication to connect with the computer host to copy the degree.

A is connected to phase A with a voltage of 100V.

B is connected to phase B 100V voltage.

C is connected to C phase 100V voltage (PT secondary or spike voltage).

As1As2 is the polar land mass end-resistant end of CT, As1 in, As2 out, and the same is true for BS1.

BS2 out (three-phase three-wire no, generally use A, C two CT), CS1 into early spring.

cs2 out.

The electronic three-phase three-wire watt-hour meter B phase current is calculated by the vector sum of a, b, c three-phase current, the three-phase apparent power is the sum of the power of each phase, that is: uania+ubnib+ucnic, the same way we can know that the active power is multiplied by the cosine of the phase angle between you and i for each phase, and the reactive power is multiplied by the sinusoid. In the case of the reverse connection of the phase sequence as you said, the input current of phase A is changed to phase C, that is, it is 120 degrees ahead, phase B is unchanged, and the actual input current of phase C is recorded by 120 degrees, and the specific power change depends on the phase relationship between the actual three-phase current and voltage and the size of the effective value.

This is just a general electronic meter, and it depends on how the manufacturer's program for power calculation is done.

If it is a mechanical watch, it will not have an effect. If it's an electronic watch, it depends on what kind of watch it is.

Ordinary table, there is no active power, there is no active power.

Electronic watches, none of them.

There are several terminals on the metering box. ABC relative to ABC terminal respectively connected to the meter terminal SA1, SA2 and SC1, SC2 is the current terminal, is the phase current, when the primary side P1 is connected to the power supply P2 load, SA2 and SC2 short to the ground, and then connected to the meter terminal, connected to the 1, 5 terminal and vice versa.

Hello: 1, the metering watt-hour meter of the high-voltage cabinet should be usedVoltage transformers and current transformersand multiply by the multiplier.

2. Due to the particularity of high-voltage metering (three-phase three-wire), [Two-element watt-hour meter

The calculation of 10kV high-voltage electricity is simpler than BAI, which is the reading difference of the DU energy meter during the assessment period, multiplied by the multiplier of the accessories in the DAO electric energy metering;

If you read the meter x1 in the last month and x2 in the current month, the reading difference of the current month's energy meter is x2-x1;

When the power supply voltage is fixed at 10kv, the rate of the voltage transformer is 10000v 100v = 100 fixed; If not, you can go to see the nameplate of the current transformer after the power failure, generally n 5, then the magnification of the electric energy metering accessories is "100 * n 5";

The total electricity energy in this assessment period is: 100*N 5*(x2-x1).

The three-phase four-wire system must be equipped with a three-phase four-wire meter, and a three-phase three-wire meter cannot be installed, otherwise when the three-phase load is unbalanced, that is, there is an unbalanced current on the center line, it will cause a large measurement error.

Whether the three-phase three-wire system and the three-phase four-wire system use the three-phase three-wire system or the three-phase four-wire system are determined by the user's incoming line and the nature of the electricity consumption.

If the user is a pure three-phase electrical appliance, such as three-phase transformer, three-phase motor, etc., you can use the three-phase three-wire line, the three-phase three-wire system only has three wires, no zero line, you can only use the three-phase three-wire meter.

If the user has a single-phase load and a three-phase load, it is a three-phase four-wire system or a three-phase five-wire system (multi-zero grounding line) line, and a three-phase four-wire meter should be used. The three-phase three-wire line has no adjustment capacity, and the three-phase load is required to be basically balanced.

The high-voltage metering in the substation should use a three-phase three-wire electronic multi-functional energy meter, the voltage is 3*100V, and it can be installed with a current transformer and a voltage transformer, and it can also be equipped with a combined transformer. The three-phase three-wire meter is generally connected to 7 wires, the voltage ABC is connected separately, AS1 is connected to terminal 1, AS2 is connected to terminal 3, CS1 is connected to 7, CS2 is connected to 9, phase B has no current line, phase B voltage and AS2 and CS2 are connected in series to ground on the junction box.

The voltage level of the three-phase four-wire watt-hour meter is 3*200 380V, which cannot be used for high-voltage metering.

By sealing the K2 (tail end) in the current circuit, the center wire can be connected. We've used it, and it should be fine!