ABB REL650 Product Manual page 19

Line distance protection REL650 ANSI
Product version: 1.3
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.
Second harmonic blocking level can be set for the function and
can be used to block each step individually
Four step phase overcurrent protection, phase segregated
output OC4SPTOC (51/67)
The four step phase overcurrent function for single pole tripping
OC4SPTOC (51_67) has an inverse or definite time delay
independent for each step separately.
All IEC and ANSI time delayed characteristics are available.
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.
Second harmonic blocking level can be set for the function and
can be used to block each step individually.
The tripping can be configured for one- and/or three-phase.
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) is configured to
measure the residual current from the three-phase current inputs
and can be configured to measure 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, zero or negative
sequence direction (EF4PTOC, 51N/67N) 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.
EF4PTOC (51N/67N) can be set directional or non-directional
independently for each of the steps.
The directional part of the function can be set to operate on
following combinations:
• Directional current (I3PDir) versus Polarizing voltage (V3PPol)
• Directional current (I3PDir) versus Polarizing current (I3PPol)
• Directional current (I3PDir) versus Dual polarizing (VPol+ZPol x
IPol) where ZPol = RPol + jXPol
ABB
IDir, VPol and IPol can be independently selected to be either zero
sequence or negative sequence.
Second harmonic blocking level can be set for the function and
can be used to block each step individually.
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.
Sensitive directional residual overcurrent and power protection
SDEPSDE (67N)
In isolated networks or in networks with high impedance
grounding, the ground fault current is significantly smaller than
the short circuit currents. In addition to this, the magnitude of the
fault current is almost independent on the fault location in the
network. The protection can be selected to use either the residual
current, 3I ·cosj or 3I ·j, or residual power component
0 0
3V ·3I ·cos j, for operating quantity. There is also available one
0 0
non-directional 3I step and one non-directional 3V
0
tripping step.
Time delayed 2-step undercurrent protection UC2PTUC (37)
Time delayed 2-step undercurrent protection UC2PTUC (37)
function is used to supervise the line for low current, for example,
to detect a loss-of-load condition, which results in a current lower
than the normal load current.
Thermal overload protection, one time constant
The increasing utilizing of the power system closer to the thermal
limits has generated a need of a thermal overload protection also
for power lines.
A thermal overload will often not be detected by other protection
functions and the introduction of the thermal overload protection
can allow the protected circuit to operate closer to the thermal
limits.
The three-phase current measuring protection has an I
characteristic with settable time constant and a thermal memory.
The temperature is displayed in either in Celsius or in Fahrenheit
depending on whether the function used is Thermal overload
protection one time constant, Fahrenheit LFPTTR (26) or Celsius
LCPTTR.
1MRK 506 337-BUS B
overvoltage
0
2
t
19