Alstom MiCOM P54 Series, Техническое руководство

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P54x/EN OP/La4 Operation
(OP) 5-198
MiCOM P543, P544, P545 & P546
OP
5.6.6.15 System checks for circuit breaker closing (P544/P546)
The system checks for circuit breaker closing logic is shown in AR Figure 45, Figure 46,
Figure 47, Figure 48, Figure 51 and Figure 52 (logic diagram supplement).
For three phase auto-reclosing and control closing of the circuit breakers, system voltage
checks are separately selectable for :-

CB1 reclosing as leader;

CB1 reclosing as follower;

CB1 control close;

CB2 reclosing as leader;

CB2 reclosing as follower;

CB2 control close.
In the AUTORECLOSE settings, if the
Num CBs
is set to
CB1 Only
or
CB2 Only
, then the
operation of the circuit breaker will be the same as described for the corresponding leader
circuit breaker (for example CB1 operation will be the same as described by CB1L in the
diagrams and descriptions.
The system check options for each circuit breaker are enabled or disabled in the
CBx SC all
setting (x = 1L, 2L, 1F, 2F) in the AUTORECLOSE column of the menu. If set to
Disabled
,
then no system checks are required on any shot, and the relevant settings are invisible.
Otherwise, the system check options that can be enabled for each breaker (as leader or
follower) are :-
System check option Setting
System checks not required for first shot of
auto-reclose
CBx SC Shot1
Fast synchronism check (note 2)
CBx SC ClsNoDly
Check synchronism stage 1 (note 1)
CBx SC CS1
Check synchronism stage 2 (note 1)
CBx SC CS2
Dead line / Live Bus
CBx SC DLLB
Live Line / Dead bus
CBx SC LLDB
Dead line / Dead bus
CBx SC DLDB
Note 1:
Two separate (independent) system synchronism check stages are
available for each circuit breaker. Each stage has different slip
frequency and phase angle settings as described in section 5.7.
Note 2:
A
fast synchronism check auto-reclose
option is available for the
three phase auto-reclose as leader circuit breaker, by menu setting
CBx SC ClsNoDly
. When the setting is enabled, then if the line and
bus come into synchronism (i.e. line energised from remote end) at
any time after the three phase dead time has started, a
AutoClose
CB
signal is issued immediately without waiting for the dead time to
elapse. This option is sometimes required for the second line end to
reclose on a line with delayed auto-reclosing (typical cycle: first line
end reclose after dead time with live bus & dead line, then second line
end reclose immediately with live bus & live line in synchronism).