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WHAT IS ELECTRICAL ENERGY ?

Kinetic Energy of the generator or Chemical Energy of the cell is converted into Electrical Energy which flows through the circuit and is converted back into Light, Heat, and kinetic Energy.

Energy flows from source to load.

ELECTRICAL ENERGY IN AN AC CIRCUIT

p(t) = v(t)*i(t)

Total Energy (E) is equal to integral of p(t) over time

E = p(t)dt = v*i*t = joules = watts-sec

WHAT IS ELECTRICAL POWER?

Electrical Power is the rate of flow of Electrical Energy in a circuit. The unit of power is the watt and is defined as joules per second. Therefore we can see that power is a rate expression

Power is equal to the rate of flow of Electrical Energy

P = dE/dt = V*I

DATA ACQUISITION : ANALOG FRONT END IC ADE7753

Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer .One of the most annoying challenges for designers of general-purpose metering systems is the design of an analog front-end for input signals that range from tens of Milli volts to hundreds of volts while spanning a wide frequency range. Several of the challenges can be solved by carefully selecting the amplifier used to drive the ADC. Today’s ADCs have phenomenal signal-to-noise ratio (SNR) and resolution. By understanding the relationship between amplifier specifications and converter requirements, you can optimize resolution and throughput of the data acquisition system.

THEORY OF OPERATION AFE IC ‘ADE7753’

• Analog Signals on Channel 1 and Channel 2 are digitized by the two ADCs.

• These signals (Current and Voltage) are multiplied in a digital multiplier.

• Multiplication generates an INSTANTANEOUS POWER SIGNAL.

• The REAL POWER is extracted from the INSTANTANEOUS POWER by a Low Pass Filter.

• REAL POWER is converted to a FREQUENCY by the DIGITAL-TO-FREQUENCY Converters.