Where does the error of the energy meter come from?

   The error of the electric energy meter can be divided into introductory error and fresh error. The introductory error refers to the error value measured under the specified rated voltage, rated frequency, standard temperature, and other laboratory conditions; the fresh error refers to the influence of external conditions similar as voltage, frequency, and temperature during the operation of the electric energy cadence. error. Two conditions must be met for the accurate dimension of the electric energy cadence one is that the speed of the slice is commensurable to the power, and the retardation necklace is commensurable to the speed of the slice; the other is that the disunion necklace is equal to the compensation necklace. Still, in real life, the disunion necklace and the rotational speed of the slice change in the form of an irregular function, which isn't a constant; due to the iron core material, the electric energy cadence under different cargo conditions has no difference between the glamorous flux and the current. There's a rigorously commensurable relationship. Thus, the electric energy cadence will inescapably produce crimes in the factual dimension. Specifically include two：

(1) Error of inductive energy cadence

All factors that affect the commensurable relationship between the speed of the electric energy cadence and the cargo power may beget crimes. Due to the effect of fresh ropes similar to a restraining necklace, disunion necklace, and compensation necklace in the factual operation of the electric energy cadence, the commensurable relationship between the rotating speed of the turntable and the cargo power is destroyed, performing in crimes.

( 2) Error of electronic energy cadence

Due to the electronic circuit board structure, the dimension performance of the electronic electric energy cadence is veritably stable, and the dimension delicacy is better than that of the inductive electric energy cadence. Or beget misalignment of multipliers, metering chips, etc., performing in crimes. The error of the electric energy cadence refers to the chance of the difference between the factual value measured by the electric energy cadence and the standard value, expressed as a relative error. In the factual operation of the electric energy cadence, due to the limitation of the manufacturing process and specialized position, as well as the influence of colorful external factors, the electric energy dimension delicacy of the electric energy cadence will inescapably diverge from the standard value, which will beget crimes.

So how to avoid crimes in the energy cadence?

1. First of all, it's necessary to judge whether the instrument is good according to the metrological verification procedures.

2. Nicely elect the position of the metering point (as close to the point as possible) to reduce the secondary cargo and secondary circle loss of the motor and ameliorate the dimension delicacy.

3. Reasonable selection of the current motor metamorphosis rate to ensure that the motor operates within the high-perfection range. For the secondary voltage of the voltage motor, a voltage compensator is used in the over-standard metering circuit to compensate for the rate difference and angle difference caused by the voltage of the secondary captain.

4. The comprehensive error of the metering device can be reduced by the reasonable selection of the electric energy cadence and the motor. In addition, in order to reduce the comprehensive error of dimension, it's also necessary to select the type of recently put into operation and modified metering bias and bear that the electric energy measures and mills must meet the conditions of the specialized operation regulations for electric energy metering bias, and elect the applicable delicacy position according to the cargo order. Before putting into production, use the electric energy meter test bench to do various testing work; in the unborn operation, periodic examination and gyration system should be enforced according to the regulations.