ABB Relion RES670, Technical Manual

Page: 377 / 934

A drop out delay of 100 ms for the measured zero-sequence and negative sequence
current will prevent a false fuse failure detection at un-equal breaker opening at the two
line ends.
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 130: 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
1MRK 511 408-UUS A
Section 13
Secondary system supervision
Phasor measurement unit RES670 2.2 ANSI 371
Technical manual