IA
IB
IC
Zero
sequence
filter
Negative
sequence
filter
VA
VB
VC
Zero
sequence
filter
Negative
sequence
filter
CurrZeroSeq
CurrNegSeq
a
b
a>b
a
b
a>b
a
b
a>b
a
b
a>b
3I0PU
3I2PU
VoltZeroSeq
VoltNegSeq
AND
AND
FuseFailDetZeroSeq
FuseFailDetNegSeq
Sequence Detection
3V0PU
3V2PU
3I0
3I2
3V0
3V2
ANSI10000036-2-en.vsd
0
100 ms
0
100 ms
ANSI10000036 V2 EN-US
Figure 391: Simplified logic diagram for sequence detection part
The calculated values 3V0, 3I0, 3I2 and 3V2 are available as service values on local HMI and
monitoring tool in PCM600.
Input and output signals
M13677-19 v6
The output signals 3PH, BLKV and BLKZ as well as the signals DLD1PH and DLD3PH from dead line
detections are blocked if any of the following conditions occur:
•
The input BLOCK is activated
•
The input BLKTRIP is activated and the internal signal FuseFailStarted is not present
•
The operation mode selector
OpModeSel is set to Disable
•
The IED is in TEST status (TEST-ACTIVE is high) and the function has been blocked from the
HMI (
BlockFUSE=Yes)
The input BLOCK signal is a general purpose blocking signal of the fuse failure supervision
function. It can be connected to a binary input of the IED in order to receive a block command from
external devices or can be software connected to other internal functions of the IED itself in order
to receive a block command from internal functions. Through OR gate it can be connected to both
binary inputs and internal function outputs.
The input BLKTRIP is intended to be connected to the trip output from any of the protection
functions included in the IED. When activated for more than 20 ms, the operation of the fuse
failure is blocked; a fixed drop-out timer prolongs the block for 100 ms. The aim is to increase the
security against unwanted operations during the opening of the breaker, which might cause
unbalance conditions for which the fuse failure might operate.
The output signal BLKZ will also be blocked if the internal dead line detection is activated. The
dead line detection signal has a 200 ms drop-out time delay.
Section 13
1MRK 502 066-UUS B
Secondary system supervision
734
Technical manual
Содержание Relion 670 series
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