ABB RELION 630 Series Technical Manual page 259

1MRS757256 F
Table 292: The calculation of load shed blocking signal for tie breaker configuration
CB configuration CB Pow consider
setting setting
Tie breaker Sending end IED
Receiving end IED
Tie breaker Sending end IED
Tie breaker Sending end IED
Tie breaker Sending end IED
Receiving end IED
Tie breaker Sending end IED
Receiving end IED
PML630/Compact Load-Shedding Solution
Technical Manual
Conditions
A = input SND_IED_QVAL is
Bad or RCV_IED_QVAL is
Bad (Within measurement
cycle)
A = input SND_IED_QVAL is
Bad (At measurement cycle)
A = input RCV_IED_QVAL is
Bad (At measurement cycle)
A = input SND_IED_TEST is
TRUE or SND_CB_POS is
Invalid or RCV_IED_TEST is
TRUE or RCV_CB_POS is
Invalid
A = input SND_CB_POS is
Intermediate
Power management functions
Load shed blocking signal
1
A
0
T
1
Load shed blocking
0
At the instance of
measurement cycle
1
A
0
T
1
Load shed blocking
0
Identical logic if the
setting is selected as "Receiving end IED"
and input RCV_IED_QVAL is "Bad" at
measurement cycle.
At the instance of
measurement cycle
1
A
0
T
1
Load shed blocking
0
Identical logic if the
setting is selected as "Receiving end IED"
and input SND_IED_QVAL is "Bad" at
measurement cycle.
1
A
0
1
Load shed blocking
0
1
A
0
1
Load shed blocking
0
Δt
Snd CB Interm time
Identical logic if input RCV_CB_POS is
"Intermediate" and the ∆t value exceeds or
is less than the
as shown above.
Section 7
3 T 4 T
2 T
3 T 4 T
2 T
CB Pow consider
4 T
2 T 3 T
CB Pow consider
t (time)
t (time)
Δt
Snd CB Interm time
Rcv CB Interm time setting
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