ABB RES670 Technical Manual page 384

Section 13
Secondary system supervision
378
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 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, energizing check, and so on). The output BLKZ
shall be used to block the impedance protection functions.
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 voltage 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 uses 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 resets
the signals BLKU, BLKZ and 3PH.
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 (criteria for open phase 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 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 prolongs the presence
of MCBOP signal to prevent the unwanted operation of voltage dependent function
due to non simultaneous closing of the main contacts of the miniature circuit breaker.
The input signal 89b is supposed to be connected via a terminal binary input to the
N.C. auxiliary contact of the line disconnector. The 89b signal sets the output signal
BLKV in order to block the voltage related functions when the line disconnector is
open. The impedance protection function does not have to be affected since there will
be no line currents that can cause malfunction of the distance protection.
1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual