In the calculation of the measurement interval of the rms value, it is very important to select the correct measurement interval, which determines the accuracy of the measurement. Through the operational relationship of U, current I and active power P, the KL3403 can also obtain all other relevant electrical data, such as apparent power S, power factor cosφ, power generation, power consumption and so on. These values ​​are based on the instantaneous voltage and instantaneous current values. It can be seen that the statistics of power and power are directly related to the errors of the voltage transformer and the current transformer. At the same time, the power and power consumption and power consumption are calculated by the KL3403 module, and the KL3403 also has two aspects of error, namely sampling error and calculation error.

The measurement deviation comes from three aspects: the error of the voltage transformer, the error of the current transformer, and the sampling calculation error of the KL3403 module. Based on KL3403's fan power generation measurement method research settings, fault detection and other functions, it can realize local and remote communication, and can adopt PROFIBUS-DP field bus networking, which is the core of reliable operation of the unit. The main controller PLC can obtain the current, voltage, power, and other electrical parameters measured by the KL3403 through the bus, and then make judgments on the operating state of the fan, and make statistics on the amount of power generation and power consumption.

The preprocessing function of the KL3403 directly provides the rms value in the process image, and can calculate various electrical parameters. The external main controller does not need to share a large amount of calculation work, but the main controller PLC is obtained from the KL3403. After the electrical information, it is still relevant to be processed.

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