Co1 Blog

Instantaneous Neutral Voltage (Vn) is the Phasor sum of all phase voltages. It is Zero in Three phase three wire system, and Three phase Four wire  Balanced System.  Let us introduce the New Factor namely 'Neutral Voltage Ratio (NVR)' which is the Ratio between the RMS of Neutral Voltage and Sum of All Phase voltage RMSs. It is approximately equal to the sine of ETA. ETA is the Angular Symmetrical Component represents the zero sequence voltage. Sine of ETA is the ratio between Zero sequence Voltage and SEL Voltage. Zero sequence voltage is 57.735% of Neutral Voltage. SEL Voltage is 1.732 times of the Quadratic Mean of Phase Voltage RMS values. Mean square of Phase Voltages are equal to the square of Average phase voltage and  Square of Standard deviation (Variance) of phase voltages.  Sine of ETA is apparently equal to the NVR defined above after detailed derivation given below. So, ETA will apparently determined as Arc Sine of NVR. Hence, NVR is also called as "SETA...

          Angular Symmetrical Components for Voltages (Line and Phase) are introduced in this blog. Now, It is applied to currents for simplification and extraction of sequence currents. A. Star Effective Line Currents (SELC): Quadratic Mean (RMS) of all Sequence Currents is referred as "Star Effective Line Current (SELC)". This Current is equal to the Quadratic Mean of all Line Currents. The power in unbalanced star connected system will be equal to the same delivered by balanced three phase system of "SEL Current". B. Delta Effective Line Currents (DELC): Effective magnitude of Positive and Negative Sequence currents is referred as "Delta Effective Line Current (DELC)". This current is equal to effective magnitude of Delta currents / Virtual Delta Currents.  C. Earth Tangent Angle for Currents (ETAC)   The Geometric angle (as shown in figure) between SELC and DELC represents the Zero sequence current which is related to Neutral current. So it is...

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                 Conventional Symmetrical components are divided into three categories such as Positive, negative and Zero Sequence Components. Now I proposed the different analysis of the symmetrical components using polar coordinate theory which we used in Vector fields namely Cylindrical coordinate system and Spherical Coordinate system.              First we represent the three sequence voltages in three coordinate (Cartesian) system. I just name the space for representation of the magnitudes of symmetrical components as "Symmetical Component Space(SCS)". Alternatively, we may call the Space as "ZPN Space".          The main purpose of this analysis is to simplify the voltage unbalance analysis, and factor estimation. Cartesian coordinate system of ZPN components are converted into two polar coordinate system. A. Cylindrical Angular Symmetrical Components (CASC) ...