ABB Relion 650 Series Technical Manual page 284

Section 9
Secondary system supervision
The delta function can be activated by setting the parameter
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 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
Enabled it will be sealed in as long as at least one phase voltages is below the set value
set to
VSealInPU . This will keep the BLKV and BLKZ signals activated as long as any phase voltage is
below the set value
the setting parameter
signals 3PH, BLKV and BLKZ signals will now be active as long as any phase voltage is below the
set value
SealIn is set to Enabled fuse failure condition is stored in the non volatile memory in the IED. At
If
start-up (due to auxiliary power interruption or re-start due to configuration change) the IED
checks the stored value in its non volatile memory and re-establishes the conditions present
before the shut down. All phase voltages must became above
activated and inhibits 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
IDLDPU (operate level for dead line detection) and the circuit breaker is closed (input 52a is
activated).
The input signal MCBOP is supposed 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
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.
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 operation mode selector
• The input BLOCK is activated
• The IED is in TEST status (TEST-ACTIVE is high) and the function has been blocked from the
HMI (BlockFUSE=Yes)
The input BLOCK 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. Through OR gate it
can be connected to both binary inputs and internal function outputs.
278
VSealInPU . If all three phase voltages drop below the set value VSealInPU and
SealIn is set to Enabled also the output signal 3PH will be activated. The
VSealInPU .
3V0PU and 3V2PU for more than 5 seconds, all phase currents are below the setting
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OpModeSel or OpDVDI . An additional drop-
OpMode is set to Disabled
1MRK 506 326-UUS B
OpDVDI to Enabled . When selected it
VSealInPU before fuse failure is de-
Line distance protection REL650
Technical manual
SealIn is