GE RPV311, Technical Manual

Page: 154 / 295

Chapter 8
– PMU
RPV311
154 RPV311-TM-EN-7
3-phase Real Power from phasor (P1)
3-phase Reactive Power from phasor (Q1)
Digitals Any digital channel
1.2 Accuracy Limits
The Total Vector Error defined through
TVE = √
(𝑋
𝑟
(𝑛) − 𝑋
𝑟
) 2 + (𝑋
𝑖
(𝑛) − 𝑋
𝑖
)2
𝑋
𝑟
2 + 𝑋
𝑖
2
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,
𝑋
𝑟
(𝑛) and 𝑋
𝑖
(𝑛) are the measured values, while 𝑋
𝑟
and 𝑋
𝑖
are
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 Range TVE max
Signal frequency ± 5 Hz of Fnom 1 %
Signal magnitude
10 % … 120 %
rated
1 %
Phase angle ± 180 % 1 %
Harmonic distortion 10 % ¹ 1 %
Out-of-band interfering signal ³
|𝑓
𝑖
− 𝑓
𝑁
| >
𝐹
𝑠
2
10 % ² 1 %
¹ Any harmonic up to 50
𝑡ℎ
order
² Of input signal magnitude
³
𝑓
𝑖
frequency of interfering signal,
𝑓
𝑁
nominal frequency and
𝐹
𝑠
synchrophasors
broadcast frequency