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Real time voltage and current phase shift analyzer for power saving applications.

Krejcar O, Frischer R - Sensors (Basel) (2012)

Bottom Line: Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced).Such quality measurement is needed to allow adequate action intervention (feedback which reduces or fully compensates reactive power).The price and the size of the final product need to remain low as they are the two important parameters of this solution.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Technologies, Faculty of Informatics and Management, University of Hradec Kralove, Rokitanskeho 62, Hradec Kralove 50003, Czech Republic. Ondrej.Krejcar@remoteworld.net

ABSTRACT
Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced). Reactive power is the main component which overloads power lines and brings excessive thermal stress to conductors. If the reactive power is optimized, it can significantly lower the electricity consumption (from 10 to 30%-varies between countries). This paper will examine and discuss the development of a measuring device for analyzing reactive power. However, the main problem is the precise real time measurement of the input and output voltage and current. Such quality measurement is needed to allow adequate action intervention (feedback which reduces or fully compensates reactive power). Several other issues, such as the accuracy and measurement speed, must be examined while designing this device. The price and the size of the final product need to remain low as they are the two important parameters of this solution.

No MeSH data available.


Determining phase shift between current and voltage.
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f2-sensors-12-11391: Determining phase shift between current and voltage.

Mentions: If a phase shift φ has been determined (Figure 2), we can derive other parameters like reactive power and apparent power using simple formulas [10]. It is a vector sum of reactive and real power [11]. RMS values of voltage, current and powers cannot be calculated by standard formulas due to the discrete area. These formulas have to be modified to passing from continuous to discrete area. Standard RMS value can be calculated by Equation (1):(1)URMS=1T∫t0t0+Tu2(t)dtwhere:URMS:Root Mean Square Voltage value ↕ continuousT:ac voltage periodt0:Starting timeu:Voltage value in defined timet:Time ↕ <0;T>


Real time voltage and current phase shift analyzer for power saving applications.

Krejcar O, Frischer R - Sensors (Basel) (2012)

Determining phase shift between current and voltage.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472890&req=5

f2-sensors-12-11391: Determining phase shift between current and voltage.
Mentions: If a phase shift φ has been determined (Figure 2), we can derive other parameters like reactive power and apparent power using simple formulas [10]. It is a vector sum of reactive and real power [11]. RMS values of voltage, current and powers cannot be calculated by standard formulas due to the discrete area. These formulas have to be modified to passing from continuous to discrete area. Standard RMS value can be calculated by Equation (1):(1)URMS=1T∫t0t0+Tu2(t)dtwhere:URMS:Root Mean Square Voltage value ↕ continuousT:ac voltage periodt0:Starting timeu:Voltage value in defined timet:Time ↕ <0;T>

Bottom Line: Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced).Such quality measurement is needed to allow adequate action intervention (feedback which reduces or fully compensates reactive power).The price and the size of the final product need to remain low as they are the two important parameters of this solution.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Technologies, Faculty of Informatics and Management, University of Hradec Kralove, Rokitanskeho 62, Hradec Kralove 50003, Czech Republic. Ondrej.Krejcar@remoteworld.net

ABSTRACT
Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced). Reactive power is the main component which overloads power lines and brings excessive thermal stress to conductors. If the reactive power is optimized, it can significantly lower the electricity consumption (from 10 to 30%-varies between countries). This paper will examine and discuss the development of a measuring device for analyzing reactive power. However, the main problem is the precise real time measurement of the input and output voltage and current. Such quality measurement is needed to allow adequate action intervention (feedback which reduces or fully compensates reactive power). Several other issues, such as the accuracy and measurement speed, must be examined while designing this device. The price and the size of the final product need to remain low as they are the two important parameters of this solution.

No MeSH data available.