ABB RER620 Technical Manual page 345

1MAC309294-MB F
RER620
Technical Manual
S1_V_A
S1_V_B
S1_V_C
S2_V_A
S2_V_B
S2_V_C
S1_ENABLE
S2_ENABLE
RESET_IN
BLOCK
Figure 179: Functional module diagram
Phase selection
The identification of source and phases for which, phase status has to be determined is
done in the phase selection.
A source is a substation feeder with breaker and ancillary equipment. The substation
source is not normally included in the loop scheme logic system, it is only intended to
supply the power for the loop control system down the feeder. All loop control systems
assume two sources of supply. These sources may be supplied by the same or different
distribution substation feeders, with different feeders permitting a higher level of service
during some fault conditions. The selection of these substations it is recommended that the
following be considered:
• Both sources supply power of the same phase rotation
• The voltage level of each source are similar
• The capacity of the each source/feeder (transformers, protective devices, regulators,
wire, etc. are capable of picking up load of the feeder to be added by a loop operation
(normally to the Sectionalizing recloser on the other source).
The phase selection is done based on the below listed settings.
• Line side src
• Vt config line
• Vt line phase
• Vt line enable
• Vt config load
• Vt load phase
• Vt load enable
Basically the recloser consists of two bus voltages as S1 and S2. This is clearly depicted
in Figure 180.
Phase
Phase
selection
status
determination
Section 5
Control functions
LCM_TRIP
LCM_CLOSE
SET_GROUP_CHANGE
SWOTF
S1_STATUS
S2_STATUS
RESET_OUT
S1_DISABLED
S2_DISABLED
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