The main purpose of a three-phase meter implementation on the KM3x devices is based on the signal’s dynamic range analysis. The current signal in metering is typically from 50 mA to 120 A, therefore the current must be digitalized by a very precise and linear ADC with wide dynamic range, typically 24 bits.
The three-phase power meter reference design is intended for the measurement and registration of active and reactive energies in three-phase four-wire networks. This design is made to be compliant with IS14697:1999 for class 0.5 accuracy for a dynamic range of 10-60 A.
All analog circuits are described in the following subsections. The Kinetis-M three-phase power meter reference design is optimized for current transformers, but various Rogowski coils can also be used. The only limitations are that the sensor output signal range must be within ±0.5 V peak and within the dimensions of the enclosure.
Three-phase power meter hardware schematic is shown in this section. schematic has four major sections: MCU, Analog sensing, user interface, and power supply. connected to CMP input seperately for KM3xZ128 MCUs. For KM3xZ256/KM35Z512 other ADC pins might not provide CMP support.
The offered meter box is to house one number three-phase four-wire energy meter. The meter box shall comply with IS: 5133/IS14772 (Part-II). It shall be capable of withstanding temperatures of boiling water for 5 minutes continuously without distortion or softening.
The reactive energy in a typical three-phase power meter is computed as an infinite integral of the unbiased instantaneous shifted phase voltage u(t-90°) and phase current i(t) waveforms. The active power (P) is measured in Watts (W), and it is expressed as a product of the voltage and the in-phase component of the alternating current.
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