Hitachi 670 Series Application Manual page 22

Section 2
Telecommunication networks and line differential protection
IEC10000062 V1 EN-US
Figure 6:
Figure 7
(deviation in calculation) within the set DeadbandtDiff value.
IEC07000226 V1 EN-US
Figure 7:
D
dt
Scattering
16
Setting DeadbandtDiff in PCM600
shows an oscillogram example of deadband, measured change in time delay and scattering
An oscillogram example showing deadband (D), measured change in time delay
(dt) and scattering
DeadbandtDiff = ±200 μs
Measured time delay change = ±200 μs
Random fluctuations in time delay due to, for example, varying switching time in multiplexers
that induces jitter and wander.
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1MRK505382-UEN Rev. K
dt
D
IEC07000226-1-en.vsdx
Communication set-up, 670/650 series
Application Guide