Link Forward - Hitachi 670 Series Application Manual
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Also See for 670 Series:
- Applications manual (438 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
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1MRK505382-UEN Rev. K
IEC07000229 V2 EN-US
Figure 23:
Redundant channels must be configured in the same way at both ends of the line differential
communication link or otherwise an unwanted trip may occur when the main channel fails and the
redundant channel is enabled. This means that it is not possible to have an LDCM for a redundant
channel only at one end.
Also, SMT configuration for the redundant channel must be left empty. The redundant channel takes
over the signal matrix configuration from the main channel when enabled. If the redundant channel
has been allocated, for example, current inputs at one end or at both ends via the SMT tool, an
unwanted trip occurs.
4.5
Link forward
In multiterminal line differential protection application, link forward feature is used to exchange data
between different communication links. This feature is available only for the 2MB/sec. variant of the
LDCM communication module.
Once this feature is enabled by settings and configuration, then the data from one communication
link can be made available to other communication links and can then be used by the protection
functions. The main advantage of this feature is the possibility of making the measurements needed
for line differential protection available at all line ends, despite there may not be communication links
between all line ends.
GUID-7BCC9EE6-84C0-4413-B3E3-7893AC2A7314 V1 EN-US
Figure 24:
Communication set-up, 670/650 series
Application Guide
Typical application with redundant channels (for two or three line ends)
Figure 24
depicts the typical application of the link forward feature.
link forwarding for typical application
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Analog and binary signal transfer for line differential protection
GUID-CA8E9B96-1575-467C-95FD-96F101589D3A v1
Section 4
27
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