Alstom Reason RPV311, Technical Manual

Page: 186 / 350

Chapter 8
– PMU
RPV311
186 RPV311-TM-EN-6
2.2 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.
Considering acquisition modules appropriate for PMU measurement, the unit is 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
2.3 COMMUNICATION PORTS, TRANSMISSION RATES
Each stream of data is transmitted through a particular UDP/IP port listed in the table below: