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Introduction - REC 561
Version 1.0-00
1MRK 580 146-XEN
Page 2 - 2
in a Substation Monitoring System (SMS) and in a complete Substation
Automation system. The communication with REC 561 uses optical fibres
to eliminate the influence of the electromagnetic interference.
2.1 REC 561 types Three types of control terminal REC 561 are available. These types con-
tain control functions and interlocking functions that are applicable for
different switchyard/busbar arrangements and different number of bays.
All the types include as basic pole discordance protection, configurable
logic, one LON communication port, one binary input module and one
command output module. For all three types of REC 561, a suitable
number of binary input/output modules must be added.
Type 1 (basic):
The basic version of REC 561 contains apparatus control modules for 1
bay and 14 high-voltage apparatuses and also interlocking modules for
single or double-breaker arrangement. This version is used when high
security, dependability, and fault tolerance are required for a substation.
Type 2 (basic + option 1):
This type of REC 561 contains apparatus control modules for up to 3 bays
and 24 high-voltage apparatuses and also interlocking modules for three
single or two double-breaker arrangements or one 1½ breaker diameter.
Type 3 (basic + option 2):
This type of REC 561 is intended to be used for arrangements up to 12
bays with up to 24 high-voltage apparatuses. It also contains interlocking
modules for two 1½ breaker diameters. The normal use of this type is on
medium-voltage level with a small number of apparatuses per bay and
with simple interlocking conditions, which can be solved by the config-
urable logic, that is, without standard interlocking modules.
2.2 Application examples The control terminal is basically used for one bay, single or double-
breaker arrangement. Optionally, the control terminal can be used for sev-
eral bays. See “REC 561 types” on page 2. Table 1, “Applicable optional
functions for different typical switchyard arrangements,” on page 3 shows
the applicable optional functions for different typical switchyard arrange-
ments. The cross (x) indicates that the options can be used for a certain
arrangement.
The figures of the switchyard arrangements below are shown as examples.
The number of disconnectors and earthing switches are configurable
within the maximum number of apparatuses.
Note that the optional-functions, fuse failure, breaker-failure protection,
and loss-of-power system voltage require three-phase current and voltage,
which are applicable only for one bay. One transformer module for either
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