What are the factors that affect the accuracy of the transmitter in the circuit?

The influence of nonlinear components The conventional voltage and current transducer are mostly communication converters (small transformers), and the secondary power frequency communication signal is rectified, filtered and stabilized to obtain the final DC signal. Because of rectifying two ji tubes, they are wrong linear devices, so its voltage and current curves have nonlinear characteristics.

The influence convention of transmitter iron core: iron core data is used as magnetic medium in transmitter transformation. On the one hand, because the nonlinear characteristics of ferromagnetic data (the initial region and saturation region of magnetized meow line) are not an ideal linear transmission relationship, it will definitely affect the accuracy of the transmitter. On the other hand, because of the hysteresis of ferromagnetic data, the iron core will also have an impact on the accuracy of the transmitter. Generally, in the power frequency range, the conventional lag angle of silicon steel sheet changes within 0 ~ 15, and the existence of this lag angle is equivalent to increasing the component of reactive power. Because the conventional power transmitter calculates the power by multiplying the voltage and current signals, this lag angle will also affect the accuracy of the power transmitter.

The influence of operational amplifier Conventional electricity transmitters are mostly composed of operational amplifiers. The temperature has a great influence on the operation of operational amplifiers. The temperature changes and the "zero" point drifts, which makes the operating point unstable and directly affects the accuracy and reliability of the transmitter.

The setting value selection of the transmitter affects the setting value of the transmitter. Although the setting value is as close to the full value as possible when it is selected, the transmitter often cannot work in the linear region in actual use, resulting in errors.

Error influence caused by impedance mismatch

The influence of system imbalance The conventional calculation power of the transmitter generally approximates that the system is balanced, but it is actually unbalanced, and this imbalance of the system often affects the accuracy of the transmitter.