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Chapter 8 – PMU
1.2
Accuracy Limits
154
Digitals
The Total Vector Error defined through
(��
(��) − ��
��
TVE = √
Represents the magnitude of the error vector, obtained by subtracting the measured
synchrophasor of the theoretical value. It is represented as a fraction of the
magnitude of the theoretical value.
In the equation above, ��
the theoretical values of the input signal at the instant of measurement.
All 1A and 5A analog inputs/boards in RA33x modules have the proper accuracy
necessary for the RPV311 PMU solution to be rated as level 1 compliant according to
IEEE C37.118 under the condition below.
Influence quantity
Signal frequency
Signal magnitude
Phase angle
Harmonic distortion
Out-of-band interfering signal ³
| ��
��
¹ Any harmonic up to 50
² Of input signal magnitude
³ ��
frequency of interfering signal, ��
��
broadcast frequency
3-phase Real Power from phasor (P1)
3-phase Reactive Power from phasor (Q1)
Any digital channel
)
2
+ (��
(��) − ��
)2
��
��
��
2
��
2
+ ��
��
��
(��) and ��
(��) are the measured values, while ��
��
��
± 5 Hz of Fnom
10 % ... 120 %
rated
± 180 %
10 % ¹
10 % ²
��
��
− ��
| >
��
2
��ℎ
order
nominal frequency and ��
��
Range
TVE max
synchrophasors
��
RPV311-TM-EN-7
RPV311
and ��
are
��
��
1 %
1 %
1 %
1 %
1 %
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