Ametek TR-2100, Руководство по эксплуатации

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TR-2100 User Manual 76
Power (fundamental)
Apparent
f f
S V
f
I
=
*
Real
f f f
P V I Cos
=
* *
Φ
Reactive
f
f f
Q V I
Sin
=
* *
Φ
For delta VTs real power is computed using the two wattmeter method.
Displacement power factor
PF Cos
= Φ
Impedance (fundamental)
I V Z
f
f
f
=
Imbalance
m
I V V
=
− +
1 1
100 * % (Ratio of NPS to PPS)
Phasor Measurement
The TR-2100 acquisition system is organized so that a sample is taken at the second marker.
The computed absolute phase angle from a Discrete Fourier Transform (DFT), using a 1
cycle window starting with this sample, will yield the angle of the vector at the exact
second.
The synchrophasor output from the TR-2100 is compatible with IEEE 1344 - 1995. This
defines the absolute angle of the positive sequence voltage vector relative to a time standard.
A second of century time code is used to compare phase angles from different locations.