ABB REL670 2.2 IEC - Page 426

The CR signal should be configured to the functional input which provides the
logic with information on received carrier signal sent by the remote end power
swing distance protection zone.
The CS functional output signal should be configured to either output relay or to
corresponding input of the “Binary signal transfer to remote end” function.
The BLKZMPS output signal should be configured to BLOCK input of the power
swing distance protection zones.
The TRIP signal should be connected correspondingly towards the tripping
functionality of the complete distance protection within the IED.
Setting calculations
SEMOD131360-29 v1
Time delay of power swing carrier send distance protection zones
SEMOD131360-32 v2
Time delay for the underreaching or overreaching carrier send power swing zone
should be set shorter (with sufficient margin) than the time delay of normal
distance protection zone 2 to obtain selective time grading also in cases of faults
during power swings. The necessary time difference depends mostly on the speed
of the communication channel used, speed of the circuit breaker used, etc. Time
difference between 100 ms and 150 ms is generally sufficient.
Reactive reach setting of power swing distance protection zones
SEMOD131360-37 v2
Set the reactive reach for the power swing zones according to the system selectivity
planning. The reach of the underreaching zone should not exceed 85% of the
protected line length. The reach of the overreaching zone should be at least 120%
of the protected line length.
Resistive reach setting of carrier send power swing distance protection
zone
SEMOD131360-40 v2
Determine the minimum possible speed of impedance ΔZ / Δt in primary Ω / s of
the expected power swings. When better information is not available from system
studies, the following equation may be used:
min min
2
z L s
v Z f= × ×
EQUATION1537 V1 EN-US (Equation 421)
Where:
v
z
is a minimum expected speed of swing impedance in Ω / s
Z
Lmin
is a minimum expected primary load impedance in Ω
f
smin
is a minimum expected oscillation (swing) frequency in Hz
Calculate the maximum permissible resistive reach for each power swing zone
separately according to the following equations.
0.8
n z
RFPP v tnPP= × ×
EQUATION1538 V1 EN-US (Equation 422)
Section 8 1MRK 506 369-UEN B
Impedance protection
420 Line distance protection REL670 2.2 IEC
Application manual