ABB REG650 Technical Manual page 317

1MRK 502 043-UUS B
Technical Manual
• V0I0 OR V2I2; Both negative and zero sequence is activated and working in
parallel in an OR-condition
• V0I0 AND V2I2; Both negative and zero sequence is activated and working in
series (AND-condition for operation)
• OptimZsNs; Optimum of negative and zero sequence (the function that has the
highest magnitude of measured negative and zero sequence current will be activated)
The delta function can be activated by setting the parameter OpDVDI to Enabled.
When selected it operates in parallel with the sequence based algorithms.
As soon as any fuse failure situation is detected, signals FuseFailDetZeroSeq,
FuseFailDetNegSeq or FuseFailDetDVDI, and the specific functionality is released,
the function will activate the output signal BLKV. The output signal BLKZ will be
activated as well if not the internal dead phase detection, DeadLineDet1Ph, is not
activated at the same time. The output BLKV can be used for blocking voltage related
measuring functions (under voltage protection, synchro-check, and so on). For
blocking of impedance protection functions output BLKZ shall be used.
If the fuse failure situation is present for more than 5 seconds and the setting parameter
SealIn is set to Enabled it will be sealed in as long as at least one phase voltages is
below the set value VSealInPU. This will keep the BLKV and BLKZ signals activated
as long as any phase voltage is below the set value VSealInPU. If all three phase
voltages drop below the set value VSealInPU and the setting parameter SealIn is set to
Enabled the output signal 3PH will also be activated. The signals 3PH, BLKV and
BLKZ signals will now be active as long as any phase voltage is below the set value
VSealInPU.
If SealIn is set to Enabled the fuse failure condition is stored in the non volatile
memory in the IED. At start-up of the IED (due to auxiliary power interruption or re-
start due to configuration change) it checks the stored value in its non volatile memory
and re-establishes the conditions that were present before the shut down. All phase
voltages must be greater than VSealInPU before fuse failure is de-activated and
removes the block of different protection functions.
The output signal BLKV will also be active if all phase voltages have been above the
setting VSealInPU for more than 60 seconds, the zero or negative sequence voltage has
been above the set value 3V0PU and 3V2PU for more than 5 seconds, all phase
currents are below the setting IDLDPU (operate level for dead line detection) and the
circuit breaker is closed (input 52a is activated).
If a MCB is used then the input signal MCBOP is to be connected via a terminal binary
input to the N.C. auxiliary contact of the miniature circuit breaker protecting the VT
secondary circuit. The MCBOP signal sets the output signals BLKV and BLKZ in
order to block all the voltage related functions when the MCB is open independent of
the setting of OpModeSel or OpDVDI. An additional drop-out timer of 150 ms
Secondary system supervision
Section 11
311