Hitachi Relion 670 Series Product Manual page 8

Line differential protection RED670
Version 2.2
A loop testing function allows complete testing including
remote end IED when local IED is set in test mode.
In a differential protection with more than 2 ends one station
can be taken out of service while the other ends are still
protected. During maintenance or power network
modification, some of the line ends may be taken out of
service while other ends are still running. As the differential
protection scheme is the main protection, it must be kept in
service to protect the remaining part of the line ends that
are in service.
Communication via optical connections ensures immunity
against disturbances.
Ready to use pre-configured application packages:
• Single breaker, 1/3 phase tripping, 2-3 line ends (A42),
see Figure 2.1
• Multi breaker, 1/3 phase tripping, 2-5 line ends (B33), see
Figure 2.2
• Multi breaker, 1/3 phase tripping, 2-3 line ends (B42), see
Figure 2.3
• Single breaker, 1/3 phase tripping, with distance
protection (C42), see Figure 2.4
Optional functions are not configured but a maximum
configuration with all optional functions are available in the
application configuration tool. Analog inputs and binary
input/output signals are pre-defined for basic use. Other
signals may be required by each particular application.
8
The basic delivery includes one binary input module and
one binary output module, which is sufficient for the default
configured I/O to trip and close circuit breaker. All IEDs can
be reconfigured with the help of the application
configuration tool in PCM600. The IED can be adapted to
special applications and special logic can be developed,
such as logic for automatic opening of disconnectors and
closing of ring bays, automatic load transfer from one
busbar to the other, and so on.
The basic IED configuration is provided with the signal
matrix, single line diagram and the application configuration
M11788-3 v11
prepared for the functions included in the product by
default. All parameters should be verified by the customer,
since these are specific to the system, object or application.
SEMOD51220-5 v16
Optional functions and optional I/O ordered will not be
configured at delivery. It should be noted that the standard
only includes one binary input and one binary output module
and only the key functions such as tripping are connected to
the outputs in the signal matrix tool. The required total I/O
must be calculated and specified at ordering.
The configurations are as far as found necessary provided
with application comments to explain why the signals have
been connected in the special way. On request, Hitachi
Power Grids is available to support the re-configuration
work, either directly or to do the design checking.
Add binary I/O boards as required for the application when
ordering.
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