Description
Argument Descriptions
Storage
A function to measure the three phase RMS volts at three nodes of an electric circuit. This is accomplished by smoothing the 3-phase rectified voltage to remove any ripple. The three phase rectified voltage is calculated as:
Measured 3-phase, L-G Input Voltage Waveform
Where,
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The instantaneous voltage magnitudes at EMTDC nodes NA, NB and NC respectively, in EMTDC subsystem SS. |
Before being output, VRMS is passed first through the REALP2 smoothing function with time constant TS in order to partially remove ripple. Note that the remaining ripple will possess a frequency of six times the fundamental frequency (i.e. a period of 2.78 ms @ 60 Hz fundamental). Hence, a value in the range 5 ms < TS < 20 ms is typical.
This function is similar to the RMS3PH function, except that instead of entering the input functions directly, the EMTDC node numbers are used.
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Author(s): |
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REAL FUNCTION VM3PH2(SS,NA,NB,NC,TS)
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Argument |
Type |
Dimension |
Description |
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SS |
INTEGER |
1 |
EMTDC subsystem number |
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NA,NB,NC |
INTEGER |
1 |
EMTDC node numbers representing the phases A, B and C at the measured bus point |
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TS |
REAL |
1 |
Smoothing Time Constant [s] |
