ABB RELION 670 Series Product Manual page 28

Transformer protection RET670 2.1 IEC
complex network configurations, such as parallel lines,
multi-terminal lines.
Distance measuring zone, quadrilateral
characteristic for series compensated lines
ZMCPDIS, ZMCAPDIS
The line distance protection is an up to five (depending
on product variant) zone full scheme protection with
three fault loops for phase-to-phase faults and three
fault loops for phase-to-earth fault for each of the
independent zones. Individual settings for each zone
resistive and reactive reach give flexibility for use on
overhead lines and cables of different types and lengths.
Quadrilateral characteristic is available.
ZMCPDIS function has functionality for load
encroachment which increases the possibility to detect
high resistive faults on heavily loaded lines.
X
Reverse
operation
IEC05000034 V1 EN-US
Figure 10. Typical quadrilateral distance protection zone with
load encroachment function activated
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.
Phase selection, quadrilateral characteristic with
fixed angle FDPSPDIS
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
28
Forward
operation
R
en05000034.vsd
the different types of fault, so that single pole tripping
and autoreclosing can be used plays an important role in
this matter. Phase selection, quadrilateral characteristic
with fixed angle FDPSPDIS is designed to accurately
select the proper fault loop in the distance function
dependent on the fault type.
SEMOD168173-4 v10
The heavy load transfer that is common in many
transmission networks may make fault resistance
coverage difficult to achieve. Therefore, FDPSPDIS 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.
Full-scheme distance measuring, Mho characteristic
ZMHPDIS
The numerical mho line distance protection is an up to
five (depending on product variant) zone full scheme
protection of short circuit and earth faults.
The full scheme technique provides back-up protection
of power lines with high sensitivity and low requirement
on remote end communication.
The zones have fully independent measuring and
settings, which gives high flexibility for all types of lines.
Built-in selectable zone timer logic is also provided in
the function.
The function can be used as under impedance back-up
protection for transformers and generators.
Full-scheme distance protection, quadrilateral for
earth faults ZMMPDIS, ZMMAPDIS
The line distance protection is an up to five (depending
on product variant) zone full scheme protection function
with three fault loops for phase-to-earth fault for each
of the independent zones. Individual settings for each
zone resistive and reactive reach give flexibility for use
on overhead lines and cables of different types and
lengths.
M13139-3 v8
The Full-scheme distance protection, quadrilateral for
earth fault functions have functionality for load
encroachment, which increases the possibility to detect
high resistive faults on heavily loaded lines , see Figure
11.
1MRK 504 155-BEN F
SEMOD175459-4 v12
SEMOD154544-4 v7
ABB