R
jX
B
A
Measured
impedance at initital
fault position
Impedance locus at initial power
swing after the fault clearance
ZMRPSB operating characteristic
Zone 2
Zone 1
IEC99000181_2_en.vsd
IEC99000181 V2 EN-US
Figure 243: Impedance trajectory within the distance protection zones 1 and 2 during and
after the fault on line B – D
7.15.3
Setting guidelines
SEMOD171741-1 v1
7.15.3.1
Scheme communication and tripping for faults occurring during power
swinging over the protected line
SEMOD131360-4 v2
The IED includes generally up to five distance protection zones. It is possible to use one or two
of them intentionally for selective fault clearing during power swings only. Following are the
basic conditions for the operation of the so called (underreaching and overreaching) power-
swing zones:
•
They must generally be blocked during normal operation and released during power
swings.
•
Their operation must be time delayed but shorter (with sufficient margin) than the set
time delay of normal distance protection zone 2, which is generally blocked by the power
swing.
•
Their resistive reach setting must secure, together with the set time delay for their
operation, that the slowest expected swings pass the impedance operate area without
initiating their operation.
Communication and tripping logic as used by the power swing distance protection zones is
schematically presented in figure
The operation of the power swing zones is conditioned by the operation of Power swing
detection (ZMRPSB) function. They operate in PUTT or POTT communication scheme with
corresponding distance protection zones at the remote line end. It is preferred to use the
communication channels over the optionally available “Line Data Communication Module -
1MRK 505 343-UEN B
Section 7
Impedance protection
373
Application manual
Содержание Relion 670 series
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