Distance Zones Quad With High Speed Distance; Power Swing Detection Zmrpsb; Power Swing Logic Pslpsch; Pole Slip Protection Pspppam - ABB RET670 Product Manual

Transformer protection RET670 2.0
Product version: 2.0
The zones can operate independently of each other in
directional (forward or reverse) or non-directional mode.
However, zone1 and zone2 is designed to measure in forward
direction only, while one zone (ZRV) is designed to measure in
the reverse direction. This makes them suitable, together with a
communication scheme, for protection of power lines and
cables in complex network configurations, such as parallel
lines, multi-terminal lines, and so on.
A new built-in adaptive load compensation algorithm prevents
overreaching of the distance zones in the load exporting end
during phase-to-earth faults on heavily loaded power lines. It
also reduces underreach in the importing end.
The ZMFPDIS function-block itself incorporates a phase-
selection element and a directional element, contrary to
previous designs in the 670-series, where these elements were
represented with separate function-blocks.
The operation of the phase-selection element is primarily based
on current change criteria (i.e. delta quantities), with
significantly increased dependability. There is also a phase
selection criterion operating in parallel which bases its
operation only on voltage and current phasors.
The directional element utilizes a set of well-established
quantities to provide fast and correct directional decision during
various power system operating conditions, including close-in
three-phase faults, simultaneous faults and faults with only
zero-sequence in-feed.
Distance zones quad with high speed distance for series
compensated networks ZMFCPDIS
High speed distance protection (ZMFCPDIS) provides sub-
cycle, down towards half-cycle, operate time for basic faults
within 60% of the line length and up to around SIR 5. At the
same time, it is specifically designed for extra care during
difficult conditions in high voltage transmission networks, like
faults on long heavily loaded lines and faults generating heavily
distorted signals. These faults are handled with outmost
security and dependability, although sometimes with reduced
operating speed.
High speed distance protection ZMFCPDIS is fundamentally
the same function as ZMFPDIS but provides more flexibility in
zone settings to suit more complex applications, such as series
compensated lines. In operation for series compensated
networks, the parameters of the directional function are altered
to handle voltage reversal.
The ZMFCPDIS function is a six-zone full scheme protection
with three fault loops for phase-to-phase faults and three fault
loops for phase-to-earth faults for each of the independent
zones, which makes the function suitable in applications with
single-phase autoreclosing.
The zones can operate independently of each other in
directional (forward or reverse) or non-directional mode. This
makes them suitable, together with a communication scheme,
28
for protection of power lines and cables in complex network
configurations, such as parallel lines, multi-terminal lines, and
so on.
A new built-in adaptive load compensation algorithm prevents
overreaching of the distance zones in the load exporting end
during phase-to-earth faults on heavily loaded power lines. It
also reduces underreach in the importing end.
The ZMFCPDIS function block incorporates a phase-selection
element and a directional element, contrary to previous designs
in the 670–series, where these elements were represented with
separate function blocks.
The operation of the phase-selection element is primarily based
on current change criteria, with significant increased
dependability. Naturally, there is also a part operating with
continuous criteria that operates in parallel
The directional element utilizes a set of well-established
quantities to provide fast and correct directional evaluation
during various conditions, including close-in three-phase faults,
simultaneous faults and faults with only zero-sequence in-feed.

Power swing detection ZMRPSB

Power swings may occur after disconnection of heavy loads or
trip of big generation plants.
Power swing detection function ZMRPSB is used to detect
power swings and initiate block of all distance protection zones.
Occurrence of earth-fault currents during a power swing
inhibits the ZMRPSB function, to allow fault clearance.

Power swing logic PSLPSCH

Power Swing Logic (PSLPSCH) is a complementary function to
Power Swing Detection (ZMRPSB) function. It provides
possibility for selective tripping of faults on power lines during
system oscillations (power swings or pole slips), when the
distance protection function should normally be blocked. The
complete logic consists of two different parts:
• Communication and tripping part: provides selective
tripping on the basis of special distance protection zones
and a scheme communication logic, which are not
blocked during the system oscillations.
• Blocking part: blocks unwanted operation of
instantaneous distance protection zone 1 for oscillations,
which are initiated by faults and their clearing on the
adjacent power lines and other primary elements.

Pole slip protection PSPPPAM

Sudden events in an electric 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) is to
1MRK 504 141-BEN C
ABB