Phase Selection, Quadrilateral Characteristic With Settable Angle; Power Swing Detection Zmrpsb; Power Swing Logic Zmrpsl; Pole Slip Protection Pspppam - ABB RED670 Product Manual

Line differential protection RED670 ANSI
Customized
Product version: 1.2
X
operation
Reverse
operation
IEC05000034 V1 EN
Figure 9. Typical quadrilateral distance protection zone with Phase
selection, quadrilateral characteristic with settable angle
function FRPSPDIS (21) activated
The independent measurement of impedance for each fault loop
together with a sensitive and reliable built-in phase selection
makes the function suitable in applications with single pole
tripping and autoreclosing.
Built-in adaptive load compensation algorithm prevents
overreaching of zone 1 at load exporting end at phase-to-
ground faults on heavily loaded power lines.
The distance protection zones can operate, independent of
each other, in directional (forward or reverse) or non-directional
mode. This makes them suitable, together with different
communication schemes, for the protection of power lines and
cables in complex network configurations, such as parallel lines,
multi-terminal lines and so on.

Phase selection, quadrilateral characteristic with settable angle

FRPSPDIS (21)
The operation of transmission networks today is in many cases
close to the stability limit. Due to environmental considerations,
the rate of expansion and reinforcement of the power system is
reduced for example, difficulties to get permission to build new
power lines. The ability to accurately and reliably classify the
different types of fault, so that single pole tripping and
autoreclosing can be used plays an important role in this
matter. The phase selection function is designed to accurately
select the proper fault loop in the distance function dependent
on the fault type.
The heavy load transfer that is common in many transmission
networks may make fault resistance coverage difficult to
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achieve. Therefore, the function has a built in algorithm for load
encroachment, which gives the possibility to enlarge the
resistive setting of both the phase selection and the measuring
zones without interfering with the load.
The extensive output signals from the phase selection gives
also important information about faulty phase(s) which can be
used for fault analysis.
A current-based phase selection is also included. The
measuring elements continuously measure three phase currents
and the residual current and, compare them with the set values.

Power swing detection ZMRPSB (68)

Power swings may occur after disconnection of heavy loads or
trip of big generation plants.
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.

Power swing logic ZMRPSL (78)

Additional logic is available to secure tripping for faults during
power swings and prevent tripping at power swings started by
a fault in the network.

Pole slip protection PSPPPAM (78)

Sudden events in an electrical power system such as large
changes in load, fault occurrence or fault clearance, can cause
power oscillations referred to as power swings. In a non-
recoverable situation, the power swings become so severe that
the synchronism is lost, a condition referred to as pole slipping.
The main purpose of the pole slip protection (PSPPPAM ,78) is
to detect, evaluate, and take the required action for pole
slipping occurrences in the power system. The electrical system
parts swinging to each other can be separated with the line/s
closest to the centre of the power swing allowing the two
systems to be stable as separated islands.
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.
Phase preference logic PPLPHIZ
The optional phase preference logic main purpose is to provide
a selective tripping for cross-country faults in isolated or high
impedance-grounded networks.
1MRK505226-BUS D
ABB