ABB Relion 670 series Product Manual page 13

ABB
Line distance protection REL670 ANSI
Pre-configured
Product version: 1.2
Power swing detection function (ZMRPSB, 68) is
used to detect power swings and initiate block of
selected distance protection zones. Occurrence of
ground-fault currents during a power swing inhibits
the ZMRPSB (68) function to allow fault clearance.
Automatic switch onto fault logic, voltage and
current based ZCVPSOF
Automatic switch onto fault logic (ZCVPSOF) is a
function that gives an instantaneous trip at closing
of breaker onto a fault. A dead line detection check
is provided to activate the function when the line is
dead.
4. Current protection
Instantaneous phase overcurrent protection
PHPIOC (50)
The instantaneous three phase overcurrent function
has a low transient overreach and short tripping
time to allow use as a high set short-circuit
protection function.
Four step phase overcurrent protection OC4PTOC
(51/67)
The four step phase overcurrent protection function
OC4PTOC (51/67) has independent inverse time
delay settings for step 1 and 4. Step 2 and 3 are
always definite time delayed.
All IEC and ANSI inverse time characteristics are
available together with an optional user defined time
characteristic.
The directional function is voltage polarized with
memory. The function can be set to be directional
or non-directional independently for each of the
steps.
A 2nd harmonic blocking can be set individually for
each step.
Instantaneous residual overcurrent protection
EFPIOC (50N)
The Instantaneous residual overcurrent protection
EFPIOC (50N) has a low transient overreach and
short tripping times to allow the use for
instantaneous ground-fault protection, with the
reach limited to less than the typical eighty percent
of the line at minimum source impedance. EFPIOC
(50N) can be configured to measure the residual
current from the three-phase current inputs or the
current from a separate current input. EFPIOC (50N)
can be blocked by activating the input BLOCK.
Four step residual overcurrent protection, zero
sequence and negative sequence direction
EF4PTOC (51N_67N)
The four step residual overcurrent protection
EF4PTOC (51N/67N) has an inverse or definite time
delay independent for each step separately.
All IEC and ANSI time-delayed characteristics are
available together with an optional user defined
characteristic.
EF4PTOC (51N/67N) can be set directional or non-
directional independently for each of the steps.
IDir, VPol and IPol can be independently selected to
be either zero sequence or negative sequence.
Second harmonic blocking can be set individually
for each step.
EF4PTOC (51N/67N) can be used as main
protection for phase-to-ground faults.
EF4PTOC (51N/67N) can also be used to provide a
system back-up for example, in the case of the
primary protection being out of service due to
communication or voltage transformer circuit failure.
Directional operation can be combined together
with corresponding communication logic in
permissive or blocking teleprotection scheme.
Current reversal and weak-end infeed functionality
are available as well.
EF4PTOC (51N/67N) can be configured to measure
the residual current from the three-phase current
inputs or the current from a separate current input.
Four step negative sequence overcurrent
protection NS4PTOC (4612)
Four step negative sequence overcurrent protection
(NS4PTOC, (4612) ) has an inverse or definite time
delay independent for each step separately.
1MRK 506 317-BUS A
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