The fundamental frequency of the current flowing to a load will be the same to the fundamental frequency of the voltage supplied to it. Due to the current usually have more harmonic components than voltage, frequency measurement easier done on the voltage supplied to it.
The frequency of the grid voltage in Indonesia is 50 Hz, whereas in some other countries is 60 Hz. To reduce the calculation errors caused by harmonic components, frequency range of the measurement values can be restricted so that the harmonic frequencies will be ignored. To increase accuracy, measurements of the frequency value for the low frequency signal, is done by first measuring the value of the period, and not by counting the occurrence of waves. Nevertheless, the accuracy of the measurement result is displayed in the format of three digits such as the frequency measuring instruments for grid voltage.
best to avoid using voltage and current sensors
Detection of voltage and current values does not use a voltage and current sensor. Generally, the voltage and current signal was converted to DC voltage signals by a sensor and then fed to the ADC input. But this will make the voltage and current cannot be analyzed further more.
In this application, the value of alternating voltage which has been normalized is fed directly to the ADC input of the microcontroller. Current can be detected by the ADC after converted into a voltage.
The Need for Phase Difference Measuring Instrument
Measure the Frequency of Grid Voltage rather than Measure the Frequency of Current
Voltage and Current Converter
The Signal Conditioning
The use of the microcontroller ADC
Frequency Measurement
Phase Difference Measurement
Output Display Format
The frequency of the grid voltage in Indonesia is 50 Hz, whereas in some other countries is 60 Hz. To reduce the calculation errors caused by harmonic components, frequency range of the measurement values can be restricted so that the harmonic frequencies will be ignored. To increase accuracy, measurements of the frequency value for the low frequency signal, is done by first measuring the value of the period, and not by counting the occurrence of waves. Nevertheless, the accuracy of the measurement result is displayed in the format of three digits such as the frequency measuring instruments for grid voltage.
best to avoid using voltage and current sensors
Detection of voltage and current values does not use a voltage and current sensor. Generally, the voltage and current signal was converted to DC voltage signals by a sensor and then fed to the ADC input. But this will make the voltage and current cannot be analyzed further more.
In this application, the value of alternating voltage which has been normalized is fed directly to the ADC input of the microcontroller. Current can be detected by the ADC after converted into a voltage.
The Need for Phase Difference Measuring Instrument
Measure the Frequency of Grid Voltage rather than Measure the Frequency of Current
Voltage and Current Converter
The Signal Conditioning
The use of the microcontroller ADC
Frequency Measurement
Phase Difference Measurement
Output Display Format
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